技术领域Technical Field
本发明涉及教学平台技术领域，尤其涉及一种基于多电平变换器系统的教学平台及其使用方法。The present invention relates to the technical field of teaching platforms, and in particular to a teaching platform based on a multi-level converter system and a use method thereof.
背景技术Background Art
多电平变换器系统由于具有模块化程度较高，谐波特性良好，开关频率较低等优势，引起了业内的广泛关注。然而，现有的多电平变换器基本组成、运行方式及控制策略在传统的多电平变换器教学中大多基于纯仿真进行，学生很难了解到多电平变换器系统实际运行方式，难以对实际电网运行形成具象化认知，导致目前的实训效果不佳。一些基础实验教学平台在电网运行过程中及教学过程中功能单一，灵活性差。因而限制了多电平变换器系统应用于实验教学平台。The multilevel converter system has attracted widespread attention in the industry due to its advantages such as high modularity, good harmonic characteristics, and low switching frequency. However, the basic components, operation modes, and control strategies of the existing multilevel converters are mostly based on pure simulation in traditional multilevel converter teaching. It is difficult for students to understand the actual operation mode of the multilevel converter system and to form a concrete understanding of the actual power grid operation, resulting in poor training results. Some basic experimental teaching platforms have single functions and poor flexibility during the operation of the power grid and the teaching process. This limits the application of multilevel converter systems in experimental teaching platforms.
发明内容Summary of the invention
本发明旨在至少解决相关技术中存在的技术问题之一。为此，本发明提供一种基于多电平变换器系统的教学平台及其使用方法，通过模块化多电平变换器及级联H桥型变换器的灵活变换实现多样化教学目的，提高了教学效率。The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a teaching platform based on a multi-level converter system and a method for using the same, which achieves diversified teaching purposes through flexible conversion of modular multi-level converters and cascaded H-bridge converters, thereby improving teaching efficiency.
本发明提供一种基于多电平变换器系统的教学平台，包括：The present invention provides a teaching platform based on a multi-level converter system, comprising:
积木式电力电子功率模块，所述积木式电力电子功率模块包括多个级联的灵活型功率变换模块，所述灵活型功率变换模块包括半桥电路，用以模块化多电平变换器，两个所述半桥电路拼接成一个全桥电路，用以级联H桥型变换器；A modular power electronic power module, the modular power electronic power module comprising a plurality of cascaded flexible power conversion modules, the flexible power conversion module comprising a half-bridge circuit for modularizing a multi-level converter, two of the half-bridge circuits being spliced into a full-bridge circuit for cascading an H-bridge converter;
实时数字控制器，所述实时数字控制器与所述灵活型功率变换模块相连，用以将模块化多电平变换器的模型文件或者级联H桥型变换器的模型文件导入，并结合框架程序转化成工程代码；A real-time digital controller, the real-time digital controller is connected to the flexible power conversion module, and is used to import a model file of a modular multi-level converter or a model file of a cascaded H-bridge converter, and convert it into an engineering code in combination with a framework program;
集约化控制电路，所述集约化控制电路采用光纤将所述实时数字控制器的控制信号传输至所述灵活型功率变换模块。An intensive control circuit uses optical fiber to transmit the control signal of the real-time digital controller to the flexible power conversion module.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括所述半桥电路包括两个IGBT以及两个二极管，所述IGBT与所述二极管反向并联，两个所述IGBT串联。According to a teaching platform based on a multi-level converter system provided by the present invention, the half-bridge circuit also includes two IGBTs and two diodes, the IGBTs and the diodes are connected in reverse parallel, and the two IGBTs are connected in series.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括桥臂电感，所述桥臂电感与所述灵活型功率变换模块级联，用以抑制模块化多电平变换器的输出电流谐波、暂态电流以及故障电流或者抑制级联H桥型变换器的输出电流谐波、暂态电流以及故障电流。According to a teaching platform based on a multi-level converter system provided by the present invention, it also includes a bridge arm inductor, which is cascaded with the flexible power conversion module to suppress the output current harmonics, transient current and fault current of the modular multi-level converter or suppress the output current harmonics, transient current and fault current of the cascaded H-bridge converter.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括并网滤波器，所述并网滤波器与所述灵活型功率变换模块串联连接或者并联连接，用以滤波模块化多电平变换器谐波或者滤波级联H桥型变换器的谐波。According to a teaching platform based on a multi-level converter system provided by the present invention, it also includes a grid-connected filter, which is connected in series or in parallel with the flexible power conversion module to filter the harmonics of the modular multi-level converter or the harmonics of the cascaded H-bridge converter.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括所述灵活型功率变换模块连接隔离型电压传感器，用以监测所述灵活型功率变换模块的直流电压；所述灵活型功率变换模块连接电流传感器，用以监测所述灵活型功率变换模块的输出电流；所述灵活型功率变换模块连接温度传感器，用以监测所述灵活型功率变换模块的温度。According to a teaching platform based on a multi-level converter system provided by the present invention, the flexible power conversion module is also connected to an isolated voltage sensor to monitor the DC voltage of the flexible power conversion module; the flexible power conversion module is connected to a current sensor to monitor the output current of the flexible power conversion module; and the flexible power conversion module is connected to a temperature sensor to monitor the temperature of the flexible power conversion module.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括上位机，所述上位机与实时数字控制器相连，用以搭建仿真模型以及监测模块化多电平变换器的实时状态或者级联H桥型变换器的实时状态。A teaching platform based on a multi-level converter system provided according to the present invention also includes a host computer, which is connected to a real-time digital controller to build a simulation model and monitor the real-time status of a modular multi-level converter or a cascaded H-bridge converter.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括通信电路，所述通信电路通过光纤将模块化多电平变换器的实时状态以及级联H桥型变换器的实时状态上传至所述上位机，并通过所述上位机显示模块化多电平变换器的实时状态以及级联H桥型变换器的实时状态。According to a teaching platform based on a multi-level converter system provided by the present invention, it also includes a communication circuit, which uploads the real-time status of the modular multi-level converter and the real-time status of the cascaded H-bridge converter to the host computer through optical fiber, and displays the real-time status of the modular multi-level converter and the real-time status of the cascaded H-bridge converter through the host computer.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括高精度智能应用型示波器，高精度智能型示波器为32位逻辑高精度智能型示波器，包括8个模拟通道，所述高精度智能应用型示波器通过传感器与灵活型功率变换模块相连，用以显示所述灵活型功率变换模块的电压电流波形。According to a teaching platform based on a multi-level converter system provided by the present invention, it also includes a high-precision intelligent application oscilloscope. The high-precision intelligent oscilloscope is a 32-bit logic high-precision intelligent oscilloscope, including 8 analog channels. The high-precision intelligent application oscilloscope is connected to a flexible power conversion module through a sensor to display the voltage and current waveforms of the flexible power conversion module.
根据本发明提供的一种基于多电平变换器系统的教学平台，还包括高功率密度电源以及变压器，所述高功率密度电源用以提供直流电源，所述变压器用以提供交流电源。A teaching platform based on a multi-level converter system provided according to the present invention also includes a high power density power supply and a transformer, wherein the high power density power supply is used to provide a DC power supply, and the transformer is used to provide an AC power supply.
本发明还提供一种基于多电平变换器系统的教学平台的使用方法，包括：The present invention also provides a method for using a teaching platform based on a multi-level converter system, comprising:
S1：将多个灵活型功率变换模块级联，将实时数字控制器与灵活型功率变换模块相连，将上位机与实时数字控制器相连，将高精度智能应用型示波器通过传感器与灵活型功率变换模块相连；S1: cascade multiple flexible power conversion modules, connect the real-time digital controller to the flexible power conversion module, connect the host computer to the real-time digital controller, and connect the high-precision intelligent application oscilloscope to the flexible power conversion module through a sensor;
S2：通过灵活型功率变换模块切换教学平台为模块化多电平变换器或教学平台为级联H桥型变换器；S2: Switch the teaching platform to a modular multi-level converter or a cascaded H-bridge converter through the flexible power conversion module;
S3：通过上位机搭建仿真模型及设计控制策略文件并下载至实时数字控制器；S3: Build simulation model and design control strategy file through host computer and download it to real-time digital controller;
S4：根据控制策略文件调试教学平台；S4: Debug the teaching platform according to the control strategy file;
S5：通过仿真模型改变控制参数；S5: changing control parameters through simulation model;
S6：通过高精度智能应用型示波器观察并记录电路及控制参数改变后模块化多电平变换器或级联H桥型变换器运行状态；S6: Observe and record the operation status of the modular multi-level converter or cascaded H-bridge converter after the circuit and control parameters are changed through a high-precision intelligent application oscilloscope;
S7：根据电路及控制参数改变后模块化多电平变换器或级联H桥型变换器运行状态，对比分析模块化多电平变换器与级联H桥型变换器工作特性。S7: According to the operating state of the modular multilevel converter or the cascaded H-bridge converter after the circuit and control parameters are changed, the operating characteristics of the modular multilevel converter and the cascaded H-bridge converter are compared and analyzed.
本发明实施例中的上述一个或多个技术方案，至少具有如下技术效果之一：The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
1、本发明的应用于教学平台的多电平变换器系统能够灵活选取灵活型功率变换模块数量及子模块运行方式、级联方式，实现功率变换模块运行灵活化；1. The multi-level converter system applied to the teaching platform of the present invention can flexibly select the number of flexible power conversion modules and the operation mode and cascade mode of the sub-modules, so as to realize the flexible operation of the power conversion modules;
2、本发明的应用于教学平台的多电平变换器系统采用模块化方式组成变换器的基本框架，将多电平变换器的各个部分依据其所实现功能划分为相对独立的模块，降低了教学难度；2. The multi-level converter system applied to the teaching platform of the present invention adopts a modular approach to form the basic framework of the converter, and divides each part of the multi-level converter into relatively independent modules according to the functions it implements, thereby reducing the difficulty of teaching;
3、本发明基于多电平变换器系统的教学平台的使用方法通过模块化多电平变换器及级联H桥型变换器的灵活变换实现多样化教学目的，提高了教学效率。3. The method for using the teaching platform based on the multi-level converter system of the present invention achieves diversified teaching purposes through flexible conversion of modular multi-level converters and cascaded H-bridge converters, thereby improving teaching efficiency.
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本发明或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
图1是本发明提供的一种基于多电平变换器系统的教学平台的使用方法流程示意图。FIG1 is a flow chart of a method for using a teaching platform based on a multi-level converter system provided by the present invention.
图2是本发明提供的一种基于多电平变换器系统的教学平台的多电平变换器系统的教学平台拓扑结构图。FIG. 2 is a topological diagram of a teaching platform of a multi-level converter system based on a teaching platform of a multi-level converter system provided by the present invention.
图3是本发明提供的一种基于多电平变换器系统的教学平台的灵活型功率变换模块用于模块化多电平变换器的结构示意图。FIG3 is a schematic structural diagram of a flexible power conversion module of a teaching platform based on a multi-level converter system provided by the present invention for use in a modular multi-level converter.
图4是本发明提供的一种基于多电平变换器系统的教学平台的灵活型功率变换模块用于级联H桥型变换器的结构示意图。FIG4 is a schematic structural diagram of a flexible power conversion module of a teaching platform based on a multi-level converter system provided by the present invention for cascading H-bridge converters.
附图标记：Reference numerals:
1、电容；2、二极管；3、IGBT；4、直流电源；5、桥臂电感；6、积木式电力电子功率模块；7、交流电源。1. Capacitor; 2. Diode; 3. IGBT; 4. DC power supply; 5. Bridge arm inductor; 6. Building block power electronic power module; 7. AC power supply.
具体实施方式DETAILED DESCRIPTION
为使本发明的目的、技术方案和优点更加清楚，下面将对本发明中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。以下实施例用于说明本发明，但不能用来限制本发明的范围。In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.
在本发明实施例的描述中，需要说明的是，除非另有明确的规定和限定，术语“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明实施例中的具体含义。In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明实施例的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
下面结合图1至图4描述本发明的一种基于多电平变换器系统的教学平台及其使用方法。A teaching platform based on a multi-level converter system and a method of using the same will be described below in conjunction with FIG. 1 to FIG. 4 .
如图2所示，一种基于多电平变换器系统的教学平台，包括：积木式电力电子功率模块6一端通过桥臂电感5与交流电源7相连，另一端与直流电源4相连，积木式电力电子功率模块6包括多个级联的灵活型功率变换模块，用以模块化多电平变换器或者级联H桥型变换器；As shown in FIG2 , a teaching platform based on a multi-level converter system includes: a building block power electronic power module 6 having one end connected to an AC power source 7 through a bridge arm inductor 5 and the other end connected to a DC power source 4, and the building block power electronic power module 6 includes a plurality of cascaded flexible power conversion modules for modularizing a multi-level converter or a cascaded H-bridge converter;
进一步地，在本发明的一些实施例中，灵活型功率变换模块包括半桥电路，两个半桥电路可拼接成一个全桥电路；当所有灵活型功率变换模块均为半桥电路时，教学平台为模块化多电平变换器，将两个灵活型功率变换模块并联运行，拼接为一个全桥电路，教学平台为级联H桥型变换器。Furthermore, in some embodiments of the present invention, the flexible power conversion module includes a half-bridge circuit, and two half-bridge circuits can be spliced into a full-bridge circuit; when all flexible power conversion modules are half-bridge circuits, the teaching platform is a modular multi-level converter, and two flexible power conversion modules are operated in parallel and spliced into a full-bridge circuit, and the teaching platform is a cascaded H-bridge converter.
进一步地，如图3以及图4所示，半桥电路包括两个IGBT3、两个二极管2以及电容1，IGBT3与二极管2反向并联。Furthermore, as shown in FIG. 3 and FIG. 4 , the half-bridge circuit includes two IGBTs 3 , two diodes 2 and a capacitor 1 , and the IGBTs 3 and the diodes 2 are connected in reverse parallel.
在本发明一些具体实施例中，如图3所示，当教学平台为模块化多电平变换器时，灵活型功率变换模块与电容1并联。In some specific embodiments of the present invention, as shown in FIG3 , when the teaching platform is a modular multi-level converter, the flexible power conversion module is connected in parallel with the capacitor 1 .
在本发明一些具体实施例中，如图4所示，当教学平台为级联H桥型变换器时，两个半桥电路并联后与电容1并联。并联电容1的目的是缓冲并滤波电流、平滑IGBT3开关动作以及降低IGBT3开关损耗。In some specific embodiments of the present invention, as shown in FIG4 , when the teaching platform is a cascaded H-bridge converter, two half-bridge circuits are connected in parallel with capacitor 1. The purpose of the parallel capacitor 1 is to buffer and filter the current, smooth the switching action of IGBT3, and reduce the switching loss of IGBT3.
进一步地，在本发明的一些实施例中，实时数字控制器与灵活型功率变换模块相连，用以将模块化多电平变换器或者级联H桥型变换器的模型文件以及生成的代码文件导入，并结合框架程序转化成工程代码，将工程代码下载后运行。Furthermore, in some embodiments of the present invention, the real-time digital controller is connected to a flexible power conversion module to import the model file and generated code file of the modular multilevel converter or the cascaded H-bridge converter, and convert them into engineering code in combination with the framework program, and then download and run the engineering code.
进一步地，在本发明的一些实施例中，集约化控制电路采用光纤将实时数字控制器的控制信号传输至灵活型功率变换模块；集约化控制电路控制IGBT3的导通与关断。Furthermore, in some embodiments of the present invention, the centralized control circuit uses optical fiber to transmit the control signal of the real-time digital controller to the flexible power conversion module; the centralized control circuit controls the on and off of IGBT3.
进一步地，在本发明的一些实施例中，上位机与实时数字控制器相连，用以搭建仿真模型以及监测模块化多电平变换器或者级联H桥型变换器的实时状态；通信电路通过光纤将模块化多电平变换器以及级联H桥型变换器的实时状态上传至所述上位机，并通过上位机显示；通信电路可将灵活型功率变换模块的电容电压值及桥臂电流值通过光纤传输至上位机。Furthermore, in some embodiments of the present invention, a host computer is connected to a real-time digital controller to build a simulation model and monitor the real-time status of a modular multilevel converter or a cascaded H-bridge converter; the communication circuit uploads the real-time status of the modular multilevel converter and the cascaded H-bridge converter to the host computer via optical fiber, and displays it through the host computer; the communication circuit can transmit the capacitor voltage value and bridge arm current value of the flexible power conversion module to the host computer via optical fiber.
进一步地，在本发明的一些实施例中，高精度智能应用型示波器用于显示电压电流波形。高精度智能应用型示波器采用32位逻辑高精度智能应用型示波器，包含8个模拟通道以及附加的运算通道和其他分析功能，提供多种类、多通道测量所需的灵活性，且支持多单元同步，将测量扩展到16个通道，以适应更多应用场合。Further, in some embodiments of the present invention, the high-precision intelligent application oscilloscope is used to display voltage and current waveforms. The high-precision intelligent application oscilloscope uses a 32-bit logic high-precision intelligent application oscilloscope, includes 8 analog channels and additional operation channels and other analysis functions, provides the flexibility required for multi-type and multi-channel measurements, and supports multi-unit synchronization, expanding the measurement to 16 channels to adapt to more applications.
进一步地，在本发明的一些实施例中，桥臂电感与灵活型功率变换模块级联，用以抑制模块化多电平变换器的输出电流谐波、暂态电流以及故障电流或者抑制级联H桥型变换器的输出电流谐波、暂态电流以及故障电流。Furthermore, in some embodiments of the present invention, the bridge arm inductor is cascaded with the flexible power conversion module to suppress the output current harmonics, transient current and fault current of the modular multilevel converter or to suppress the output current harmonics, transient current and fault current of the cascaded H-bridge converter.
进一步地，在本发明的一些实施例中，并网滤波器与灵活型功率变换模块串联连接或者并联连接，用以滤波模块化多电平变换器的谐波或者滤波级联H桥型变换器的谐波。并网滤波器通过可调电感和电容并联，利用可调电感和电容的频率特性，滤除信号中的谐波分量，从而提高教学平台中模块化多电平变换器或者级联H桥型变换器工作特性的分析精度。Furthermore, in some embodiments of the present invention, the grid-connected filter is connected in series or in parallel with the flexible power conversion module to filter the harmonics of the modular multilevel converter or the harmonics of the cascaded H-bridge converter. The grid-connected filter uses the frequency characteristics of the adjustable inductor and capacitor in parallel to filter out the harmonic components in the signal, thereby improving the analysis accuracy of the working characteristics of the modular multilevel converter or the cascaded H-bridge converter in the teaching platform.
进一步地，在本发明的一些实施例中，高功率密度电源用以提供直流电源，变压器用以提供交流电源。Furthermore, in some embodiments of the present invention, the high power density power supply is used to provide a DC power supply, and the transformer is used to provide an AC power supply.
高功率密度电源实现多电平变换器系统实验教学平台可靠供电，高功率密度电源连接在多电平变换器系统的教学平台的直流侧；变压器连接在多电平变换器系统实验教学平台的交流侧。The high power density power supply realizes reliable power supply of the multi-level converter system experimental teaching platform. The high power density power supply is connected to the DC side of the teaching platform of the multi-level converter system; and the transformer is connected to the AC side of the experimental teaching platform of the multi-level converter system.
进一步地，在本发明的一些实施例中，灵活型功率变换模块连接隔离型电压传感器，用以监测灵活型功率变换模块的直流电压；灵活型功率变换模块连接电流传感器，用以监测灵活型功率变换模块的输出电流；灵活型功率变换模块连接温度传感器，用以监测灵活型功率变换模块的温度。Furthermore, in some embodiments of the present invention, the flexible power conversion module is connected to an isolated voltage sensor to monitor the DC voltage of the flexible power conversion module; the flexible power conversion module is connected to a current sensor to monitor the output current of the flexible power conversion module; and the flexible power conversion module is connected to a temperature sensor to monitor the temperature of the flexible power conversion module.
通过灵活型功率变换模块连接电压传感器、电流传感器以及温度传感器能够实时监测灵活型功率变换模块的状态，灵活型功率变换模块能够连接多种控制器，从而可监测灵活型功率变换模块多种状态。By connecting the flexible power conversion module to a voltage sensor, a current sensor and a temperature sensor, the status of the flexible power conversion module can be monitored in real time. The flexible power conversion module can be connected to a variety of controllers to monitor various states of the flexible power conversion module.
进一步地，在本发明的一些实施例中，灵活型功率变换模块包括多个电源端口，其中，5V电源端口用以驱动IGBT，12V电源供冷却风扇，DC-接口连接直流电源负极，DC+连接直流电源正极，AC接口用以连接交流电源。Furthermore, in some embodiments of the present invention, the flexible power conversion module includes multiple power ports, wherein the 5V power port is used to drive the IGBT, the 12V power supply is provided for the cooling fan, the DC- interface is connected to the negative pole of the DC power supply, the DC+ is connected to the positive pole of the DC power supply, and the AC interface is used to connect to the AC power supply.
通过设置多个电源端口，从而保证教学平台的有效供电。By setting up multiple power ports, effective power supply of the teaching platform is ensured.
进一步地，在本发明的一些实施例中，实时数字控制器包括POWER板卡、CPU板卡、数字信号输出板卡、PWM板卡、ADC板卡、DAC板卡、数字量输入板卡、编码器信号输入板卡以及TELECON板卡；Further, in some embodiments of the present invention, the real-time digital controller includes a POWER board, a CPU board, a digital signal output board, a PWM board, an ADC board, a DAC board, a digital quantity input board, an encoder signal input board, and a TELECON board;
POWER板卡与实时数字控制器内部各板卡一一连接，为实时数字控制器内部各板卡提供多路电源，并可通过插件向外输出；The POWER board is connected one by one with each board inside the real-time digital controller, providing multiple power supplies for each board inside the real-time digital controller, and can output to the outside through the plug-in;
CPU板卡通过专用的总线与实时数字控制器外部各板卡一一连接，用于控制实时数字控制器外部各板卡；The CPU card is connected to each external card of the real-time digital controller through a dedicated bus, and is used to control each external card of the real-time digital controller;
数字信号输出板卡前端与PWM板卡相连，后端通过12路光纤与灵活型功率变换模块相连，实现灵活型功率变换模块开关信号传输功能；The front end of the digital signal output board is connected to the PWM board, and the back end is connected to the flexible power conversion module through 12 optical fibers to realize the switch signal transmission function of the flexible power conversion module;
PWM板卡前端与现场可编程门阵列FPGA（Field Programmable Gate Array，简称FPGA）相连，将FPGA产生的PWM信号传输给数字信号输出板卡；The front end of the PWM board is connected to the Field Programmable Gate Array (FPGA) to transmit the PWM signal generated by the FPGA to the digital signal output board;
ADC板卡与FPGA相连接，实现模数转换功能；The ADC board is connected to the FPGA to realize the analog-to-digital conversion function;
DAC板卡与FPGA相连接，实现8通道的模拟量输出；The DAC board is connected to the FPGA to achieve 8-channel analog output;
数字量输入板卡共36路，给数字量输入板卡的任一通道输入5V信号，可检测到对应通道的状态为1；输入0V信号，则对应通道状态为0，可通过上位机配置为隔离型输入；The digital input board has 36 channels in total. If a 5V signal is input to any channel of the digital input board, the state of the corresponding channel can be detected as 1; if a 0V signal is input, the state of the corresponding channel is 0, which can be configured as an isolated input through the host computer.
编码器信号输入板卡可处理接入的增量式编码器信号，共有5个编码器解码单元，可输出转速、位置、方向信息，同时有3路脉冲信号捕获引脚CAP；The encoder signal input board can process the connected incremental encoder signal. There are 5 encoder decoding units in total, which can output speed, position, and direction information. There are also 3 pulse signal capture pins CAP.
电信（TELECON）板卡具有遥控功能，对远方的一些开关设备进行远程控制。The telecommunications (TELECON) board has a remote control function, which can remotely control some switch devices in distant places.
在本发明的一些具体实施例中，多电平变换器系统实验教学平台的直流端子连接直流源，交流端子连接三相变压器，通过DSP数字信号处理控制器实现控制策略，采用可编程门阵列（FPGA）生成灵活型功率变换模块IGBT的驱动信号，并利用光纤将输出的驱动信号传输到各级联的灵活型功率变换模块，各灵活型功率变换模块电容电压值及电流值同样通过光纤传输至上位机，通信电路将多电平变换器系统实验教学平台实时状态上传至上位机显示；当所有积木式电力电子功率模块工作于半桥模式时，实验平台为模块化多电平变换器，通过实时数字控制器下载其模型文件及相应控制策略，实现模块化多电平变换器的毫秒级控制，完成模块化多电平变换器的相关教学后，仅需修改模型文件，令两个积木式电力电子功率模块并联运行，拼接为一个全桥电路，此时实验平台工作于级联H桥型变换器模式，通过实时数字控制器下载其模型文件及相应控制策略，进而完成级联H桥型变换器的相关教学任务。In some specific embodiments of the present invention, the DC terminal of the multilevel converter system experimental teaching platform is connected to a DC source, and the AC terminal is connected to a three-phase transformer. The control strategy is implemented through a DSP digital signal processing controller. A programmable gate array (FPGA) is used to generate a drive signal of the flexible power conversion module IGBT, and the output drive signal is transmitted to each cascaded flexible power conversion module by optical fiber. The capacitor voltage value and current value of each flexible power conversion module are also transmitted to the host computer through the optical fiber. The communication circuit uploads the real-time status of the multilevel converter system experimental teaching platform to the host computer for display; when all building block power electronic power modules work in half-bridge mode, the experimental platform is a modular multilevel converter, and its model file and corresponding control strategy are downloaded through the real-time digital controller to realize millisecond-level control of the modular multilevel converter. After completing the relevant teaching of the modular multilevel converter, it is only necessary to modify the model file so that two building block power electronic power modules run in parallel and are spliced into a full-bridge circuit. At this time, the experimental platform works in the cascaded H-bridge converter mode, and its model file and corresponding control strategy are downloaded through the real-time digital controller, thereby completing the relevant teaching tasks of the cascaded H-bridge converter.
如图1所示，一种基于多电平变换器系统的教学平台的使用方法，包括：As shown in FIG1 , a method for using a teaching platform based on a multi-level converter system includes:
S1：将多个灵活型功率变换模块级联，将实时数字控制器与灵活型功率变换模块相连，将上位机与实时数字控制器相连，将高精度智能应用型示波器通过传感器与灵活型功率变换模块相连；S1: cascade multiple flexible power conversion modules, connect the real-time digital controller to the flexible power conversion module, connect the host computer to the real-time digital controller, and connect the high-precision intelligent application oscilloscope to the flexible power conversion module through a sensor;
S2：通过灵活型功率变换模块切换教学平台为模块化多电平变换器或教学平台为级联H桥型变换器；S2: Switch the teaching platform to a modular multi-level converter or a cascaded H-bridge converter through the flexible power conversion module;
S3：通过上位机搭建仿真模型及设计控制策略文件并下载至实时数字控制器；S3: Build simulation model and design control strategy file through host computer and download it to real-time digital controller;
S4：根据控制策略文件调试教学平台；S4: Debug the teaching platform according to the control strategy file;
S5：通过仿真模型改变控制参数；S5: changing control parameters through simulation model;
S6：通过高精度智能应用型示波器观察并记录电路及控制参数改变后模块化多电平变换器或级联H桥型变换器运行状态；S6: Observe and record the operation status of the modular multi-level converter or cascaded H-bridge converter after the circuit and control parameters are changed through a high-precision intelligent application oscilloscope;
S7：根据电路及控制参数改变后模块化多电平变换器或级联H桥型变换器运行状态，对比分析模块化多电平变换器与级联H桥型变换器工作特性。S7: According to the operating state of the modular multilevel converter or the cascaded H-bridge converter after the circuit and control parameters are changed, the operating characteristics of the modular multilevel converter and the cascaded H-bridge converter are compared and analyzed.
本发明的有益效果是：The beneficial effects of the present invention are:
1、本发明的应用于教学平台的多电平变换器系统能够灵活选取灵活型功率变换模块数量及子模块运行方式、级联方式，实现功率变换模块运行灵活化；1. The multi-level converter system applied to the teaching platform of the present invention can flexibly select the number of flexible power conversion modules and the operation mode and cascade mode of the sub-modules, so as to realize the flexible operation of the power conversion modules;
2、本发明的应用于教学平台的多电平变换器系统采用模块化方式组成变换器的基本框架，将多电平变换器的各个部分依据其所实现功能划分为相对独立的模块，降低了教学难度；2. The multi-level converter system applied to the teaching platform of the present invention adopts a modular approach to form the basic framework of the converter, and divides each part of the multi-level converter into relatively independent modules according to the functions it implements, thereby reducing the difficulty of teaching;
3、本发明基于多电平变换器系统的教学平台的使用方法通过模块化多电平变换器及级联H桥型变换器的灵活变换实现多样化教学目的，提高了教学效率。3. The method for using the teaching platform based on the multi-level converter system of the present invention achieves diversified teaching purposes through flexible conversion of modular multi-level converters and cascaded H-bridge converters, thereby improving teaching efficiency.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
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| CN202410881847.9ACN118675397A (en) | 2024-07-03 | 2024-07-03 | Teaching platform based on multi-level converter system and application method thereof |
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| CN202410881847.9ACN118675397A (en) | 2024-07-03 | 2024-07-03 | Teaching platform based on multi-level converter system and application method thereof |
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