技术领域technical field
本发明属于配电网无功补偿与谐波治理设备的性能检验领域，涉及一种电流扰动源发生装置，尤其涉及一种可变电压等级的电流扰动源。The invention belongs to the performance inspection field of distribution network reactive power compensation and harmonic control equipment, and relates to a current disturbance source generator, in particular to a current disturbance source with a variable voltage level.
背景技术Background technique
现代电力系统负荷呈现多样性和复杂性的特点，具体可以归结为谐波含量大(整流设备)、功率因数低(三相感应电机)，功率波动性(电弧炉)、冲击性(电气化铁道和城市轨道交通)等特点。具备这些特点的负荷会严重影响当前电网的电能质量，会缩短设备使用寿命、增加电网损耗、降低成品率等，严重时甚至会危及电力系统的正常运行。Modern power system loads present the characteristics of diversity and complexity, which can be attributed to large harmonic content (rectifier equipment), low power factor (three-phase induction motor), power fluctuation (electric arc furnace), impact (electrified railway and urban rail transit) and other characteristics. Loads with these characteristics will seriously affect the power quality of the current grid, shorten the service life of equipment, increase grid loss, reduce yield, etc., and even endanger the normal operation of the power system in severe cases.
目前，电能质量问题已经得到了社会各界的普遍关注，大量的科研人员及企业投身于电能质量治理的研究。出现了大量的电能质量治理设备，较常见的有：动态电压恢复器，固态切换开关、有源滤波器，静止同步补偿器等。除此之外，还有很多的其它定制电力系统装置，解决特定工况下的电能质量问题。这些技术的发展，均得益于电力电子器件及相关控制技术的发展。正是由于这一技术的成熟，使得电能质量治理设备迅速发展并达到井喷期。At present, the problem of power quality has been widely concerned by all walks of life, and a large number of researchers and enterprises have devoted themselves to the research of power quality control. There are a large number of power quality control equipment, the more common ones are: dynamic voltage restorer, solid-state switch, active filter, static synchronous compensator, etc. In addition, there are many other customized power system devices to solve power quality problems under specific working conditions. The development of these technologies has benefited from the development of power electronic devices and related control technologies. It is precisely because of the maturity of this technology that the power quality control equipment has developed rapidly and reached the blowout period.
电能质量问题的突出及电能质量治理设备的发展进而对电力设备测试手段提出了挑战。基于全控电力电子器件的电流扰动发生器，能模拟各类常见的配电网电能质量问题，如谐波电流、无功电流问题等。目前，电能质量试验系统中所用的电流扰动源基本为固定电压等级，原理都是通过整流变压器和整流桥整流后再逆变为谐波或无功电流输出；少数为多电压等级，也是在上述固定电压等级的基础上通过输出侧再接入一台变压器来实现，整个电流扰动源成本较大。The prominence of power quality problems and the development of power quality control equipment pose challenges to the testing methods of power equipment. The current disturbance generator based on fully controlled power electronic devices can simulate various common power quality problems in distribution networks, such as harmonic currents and reactive current problems. At present, the current disturbance sources used in the power quality test system are basically fixed voltage levels. The principle is that they are rectified by rectifier transformers and rectifier bridges and then inverted into harmonic or reactive current outputs; a few are multi-voltage levels, also in the above-mentioned On the basis of a fixed voltage level, it is realized by connecting a transformer to the output side, and the cost of the entire current disturbance source is relatively high.
发明内容Contents of the invention
本发明目的在于提供一种可变电压等级的电流扰动源，解决现有的电能质量试验系统电压等级过于单一的问题。The purpose of the present invention is to provide a current disturbance source with variable voltage level, so as to solve the problem that the voltage level of the existing power quality test system is too single.
为达到以上目的，本发明采取如下技术方案予以实现：To achieve the above object, the present invention takes the following technical solutions to achieve:
一种可变电压等级的电流扰动源，包括依次连接的充电电阻R1及其旁路开关KM-BP，整流变压器分接头投切用接触器KM1、KM2...KMn，整流变压器，背靠背功率单元和滤波单元；所述整流变压器原边绕组为多分接头绕组，整流变压器副边绕组为多绕组结构，每个副边绕组连接一个背靠背功率单元，所述充电电阻接三相交流充电系统，滤波单元接三相交流系统。A current disturbance source with variable voltage levels, including sequentially connected charging resistor R1 and its bypass switch KM-BP, rectifier transformer tap switching contactors KM1, KM2...KMn, rectifier transformer, back-to-back power unit and a filter unit; the primary winding of the rectifier transformer is a multi-tap winding, the secondary winding of the rectifier transformer is a multi-winding structure, each secondary winding is connected to a back-to-back power unit, the charging resistor is connected to a three-phase AC charging system, and the filtering unit connected to a three-phase AC system.
作为本发明进一步优选方案，所述整流变压器为3台单相变压器或1台三相变压器，相应的背靠背功率单元整流侧分为单相整流模式或三相整流模式；背靠背功率单元整流侧相互隔离连接整流变压器副边不同绕组，整流变压器为三相结构时，其三相三绕组视为1个单位绕组连接一个背靠背功率单元；背靠背功率单元中间直流母线电压，在固定调制比下通过投切不同的变压器分接头来调节大小，背靠背功率单元输出侧每相级联后通过滤波单元接三相交流系统。As a further preferred solution of the present invention, the rectifier transformers are three single-phase transformers or one three-phase transformer, and the rectification sides of the corresponding back-to-back power units are divided into single-phase rectification mode or three-phase rectification mode; the rectification sides of the back-to-back power units are isolated from each other Connect different windings on the secondary side of the rectifier transformer. When the rectifier transformer has a three-phase structure, its three-phase three-winding is regarded as a unit winding and connected to a back-to-back power unit; The transformer taps are used to adjust the size, and each phase of the output side of the back-to-back power unit is cascaded and then connected to the three-phase AC system through the filter unit.
作为本发明进一步优选方案，所述整流变压器为三相结构时，副边绕组为三角形结构。As a further preferred solution of the present invention, when the rectifier transformer has a three-phase structure, the secondary winding has a delta structure.
作为本发明进一步优选方案，所述背靠背功率单元包括依次连接的输入电感L1，整流桥，直流侧滤波电容C1和逆变用H桥。As a further preferred solution of the present invention, the back-to-back power unit includes an input inductor L1, a rectifier bridge, a DC side filter capacitor C1 and an H-bridge for inverter connected in sequence.
作为本发明进一步优选方案，所述背靠背功率单元的整流侧和逆变侧均采用全控型器件。As a further preferred solution of the present invention, both the rectification side and the inverter side of the back-to-back power unit adopt full-control devices.
作为本发明进一步优选方案，所述滤波单元包括串联的电感L2、L3及连接于电感L2、L3与零线之间的电容C2和电阻R3。As a further preferred solution of the present invention, the filter unit includes inductors L2, L3 connected in series, and a capacitor C2 and a resistor R3 connected between the inductors L2, L3 and the neutral line.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
(1)本发明在整流侧设置变压器，通过投切变压器多分接头，实现多电压等级的电流扰动源，电流扰动源可发出指定次谐波和指定次的谐波组合及无功电流，数值连续可调；(1) In the present invention, a transformer is installed on the rectifier side, and a current disturbance source with multiple voltage levels is realized by switching multiple taps of the transformer. The current disturbance source can emit specified harmonics and harmonic combinations of specified orders and reactive current, and the values are continuous adjustable;
(2)电流扰动源功率单元中间直流环节的电容电压可大范围调节，调制比可设计成理想值，从而使得电流扰动源能够适应宽范围的多个电压等级的电能质量试验系统，避免了在输出侧另外加装变压器，降低了试验系统建设成本；(2) The capacitor voltage of the middle DC link of the power unit of the current disturbance source can be adjusted in a wide range, and the modulation ratio can be designed to an ideal value, so that the current disturbance source can adapt to the power quality test system with multiple voltage levels in a wide range, avoiding the An additional transformer is installed on the output side, which reduces the construction cost of the test system;
(3)电流扰动源在适应不同电压等级时，不论整流还是逆变侧的调制比都可以设计成理想值，这避免了调制比过低带来一个开关周期中出现大量窄脉冲触发信号的问题，从而减小了逆变器输出纹波电压，提高了扰动电流的控制精度；(3) When the current disturbance source adapts to different voltage levels, the modulation ratio of both rectification and inverter sides can be designed to an ideal value, which avoids the problem of a large number of narrow pulse trigger signals in one switching cycle caused by too low modulation ratio , thereby reducing the inverter output ripple voltage and improving the control accuracy of the disturbance current;
进一步，电流扰动源装置逆变侧采用级联H桥结构，等效开关频率提高到2m倍器件开关频率(其中，m表示每相级联H桥单元数)，电流扰动源能够精确输出高次谐波。Furthermore, the inverter side of the current disturbance source device adopts a cascaded H-bridge structure, and the equivalent switching frequency is increased to 2m times the switching frequency of the device (where m represents the number of cascaded H-bridge units per phase), and the current disturbance source can accurately output high-order harmonic.
附图说明Description of drawings
图1为三相整流模式下的电流扰动源拓扑结构图；Figure 1 is a topological structure diagram of a current disturbance source in a three-phase rectification mode;
图2为三相整流模式下的背靠背功率单元拓扑结构图；Figure 2 is a topological structure diagram of back-to-back power units in three-phase rectification mode;
图3为一种低压电能质量试验系统图；Fig. 3 is a kind of low-voltage power quality test system diagram;
图4为电流扰动源1140V出线时的拓扑结构图Figure 4 is the topological structure diagram when the current disturbance source 1140V goes out
图5为电流扰动源600V/660V/690V出线时的拓扑结构图Figure 5 is the topological structure diagram when the current disturbance source is 600V/660V/690V outgoing
图6为电流扰动源380V出线时的拓扑结构图Figure 6 is the topological structure diagram when the current disturbance source is 380V outgoing
具体实施方式detailed description
下面结合附图和具体实施例对本发明进行详细描述：The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:
如图1，本发明提供了一种具有可变电压等级的配电网电流扰动源，包括充电电阻R1及旁路开关KM-BP、整流变压器分接头投切用接触器KM1,KM2...KMn、整流变压器、背靠背功率单元和输出滤波单元；所述整流变压器原边绕组为多分接头绕组，整流变压器副边绕组为多绕组结构，每个副边绕组连接一个背靠背功率单元，电流扰动源输入接三相交流充电系统，母线电压值固定；电流扰动源输出接三相可变电压系统，母线电压值不固定，可分为若干个等级。As shown in Figure 1, the present invention provides a distribution network current disturbance source with variable voltage level, including charging resistor R1, bypass switch KM-BP, contactors KM1, KM2 for switching taps of rectifier transformers... KMn, rectifier transformer, back-to-back power unit and output filter unit; the primary winding of the rectifier transformer is a multi-tap winding, the secondary winding of the rectifier transformer is a multi-winding structure, each secondary winding is connected to a back-to-back power unit, and the current disturbance source input When connected to a three-phase AC charging system, the voltage value of the busbar is fixed; when the output of the current disturbance source is connected to a three-phase variable voltage system, the voltage value of the busbar is not fixed and can be divided into several levels.
如图2所示，背靠背功率单元包括依次连接的输入电感L1，整流桥，直流侧滤波电容C1和逆变用H桥。背靠背功率单元整流侧分单相整流或三相整流两种模式，整流侧相互独立，分别接变压器不同绕组；逆变侧采用级联型多电平结构，能够有效提高输出的等效开关频率。整流侧和逆变侧均采用全控型器件，使得背靠背结构两侧变流器均能实现四象限运行。As shown in Fig. 2, the back-to-back power unit includes an input inductor L1, a rectifier bridge, a DC side filter capacitor C1 and an H-bridge for inverter connected in sequence. The rectification side of the back-to-back power unit is divided into two modes: single-phase rectification or three-phase rectification. The rectification sides are independent of each other and connected to different windings of the transformer; the inverter side adopts a cascaded multi-level structure, which can effectively increase the equivalent switching frequency of the output. Both the rectification side and the inverter side adopt full-control devices, so that the converters on both sides of the back-to-back structure can realize four-quadrant operation.
所述输出滤波器包括电感L2、L3和电容C2及电阻R3，电感L2、L3串联，电容C2和电阻R3连接于电感L2、L3与零线之间。其中L3和C2在电流扰动时可以不需要配置，用线路等效电感和电容代替。The output filter includes inductors L2, L3, capacitor C2, and resistor R3. The inductors L2, L3 are connected in series, and the capacitor C2 and resistor R3 are connected between the inductors L2, L3 and the neutral line. Among them, L3 and C2 do not need to be configured when the current is disturbed, and are replaced by the equivalent inductance and capacitance of the line.
电流扰动源适应不同电压等级的电路拓扑结构如图1所示，与本发明密切相关的主要设备和元器件的电气参数设计方法如下：The current disturbance source adapts to the circuit topology of different voltage levels as shown in Figure 1, and the electrical parameter design method of the main equipment and components closely related to the present invention is as follows:
首先是确定电流扰动源所适应的最大电压等级为多少，然后根据该电压等级确定逆变侧H桥级联数m；H桥级联数确定后针对扰动源输出的每个电压等级按照逆变侧合适的调制比来计算每个背靠背功率单元中间直流环节的直流母线电压，中间直流电压等级个数与分接头个数n相同；进而再根据整流侧合适的调制比反推计算出对应的整流侧交流输入电压，从而得到了整流变压器的副边电压和每个分接头的变比。The first is to determine the maximum voltage level that the current disturbance source is suitable for, and then determine the cascaded number m of H bridges on the inverter side according to the voltage level; after the number of cascaded H bridges is determined, each voltage level output by the disturbance source is determined according to The appropriate modulation ratio on the rectification side is used to calculate the DC bus voltage of the intermediate DC link of each back-to-back power unit. side AC input voltage, so as to obtain the secondary side voltage of the rectifier transformer and the transformation ratio of each tap.
所述整流变压器的容量由电流扰动源的有功容量决定；如果电流扰动源还需要输出三相不平衡无功电流，则整流变压器的容量值最好再增加一个10％～20％的电流扰动源无功容量值。The capacity of the rectifier transformer is determined by the active capacity of the current disturbance source; if the current disturbance source also needs to output three-phase unbalanced reactive current, the capacity value of the rectifier transformer is preferably increased by another 10% to 20% of the current disturbance source Reactive capacity value.
整流变压器根据功率单元整流模式的不同可选3台单相整流变压器或1台三相两种结构，原边绕组为多分接头绕组、故对1台三相结构的变压器其三相绕组最好接为星型；副边绕组为多绕组结构，每个绕组连接1个功率单元，变压器为1台三相结构时，三相三绕组视为1个单位绕组连接一个背靠背功率单元；采用1台三相结构时，副边绕组最好接为三角形以便抑制整流侧带来的3次及3的倍数次谐波电流。The rectifier transformer can choose 3 single-phase rectifier transformers or 1 three-phase structure according to the different rectification modes of the power unit. The primary winding is a multi-tap winding. It is star-shaped; the secondary winding is a multi-winding structure, and each winding is connected to a power unit. When the transformer is a three-phase structure, the three-phase three-winding is regarded as a unit winding connected to a back-to-back power unit; a three-phase In the phase structure, the secondary winding is preferably connected as a triangle in order to suppress the 3rd and 3rd multiple harmonic current brought by the rectifier side.
其他电路元器件参数设计，如充电电阻R1、输入电感L1、中间直流电容C1、输出滤波器单元L2，C2，L3等均按有源电力滤波器(APF)或静止同步补偿器(STATCOM)的通用设计方法考虑，包括电流扰动源的控制及监控系统等等也是参照APF、STATCOM的设计方法考虑。The parameter design of other circuit components, such as charging resistor R1, input inductor L1, intermediate DC capacitor C1, output filter unit L2, C2, L3, etc., are all based on the active power filter (APF) or static synchronous compensator (STATCOM) The general design method considerations, including the control and monitoring system of the current disturbance source, are also considered with reference to the design methods of APF and STATCOM.
图3给出了电流扰动源在低压电能质量试验系统中的一种具体应用。图3中的电流扰动源具备50次谐波以内的任意次谐波与无功电流发生能力。电流扰动源可多台并联使用，其总容量为2MVA，输入充电电源系统电压为380V，输出所接试验母线电压等级分别为380V、600V、660V、690V和1140V。本实施例的电流扰动源采用图1和图2中所示的三相整流模式下的拓扑结构，本发明涉及电流扰动源中的几个重要电气参数计算如下：Figure 3 shows a specific application of the current disturbance source in the low-voltage power quality test system. The current disturbance source in Figure 3 has the ability to generate any harmonic and reactive current within the 50th harmonic. Multiple current disturbance sources can be used in parallel, the total capacity is 2MVA, the input charging power system voltage is 380V, and the output test bus voltage levels are 380V, 600V, 660V, 690V and 1140V respectively. The current disturbance source of this embodiment adopts the topology structure under the three-phase rectification mode shown in Fig. 1 and Fig. 2, and several important electrical parameters in the current disturbance source involved in the present invention are calculated as follows:
1)按最大电压等级1140V，选取逆变侧H桥级联数m＝2；1) According to the maximum voltage level of 1140V, select the cascaded number of H bridges on the inverter side m=2;
2)考虑600V、660V和690V电压等级相近可合并为1个690V等级，故分接头个数n＝中间直流电压等级数＝3；2) Considering that the voltage levels of 600V, 660V and 690V are similar, they can be combined into one 690V level, so the number of taps n = the number of intermediate DC voltage levels = 3;
3)根据电流扰动源输出连接母线的电压等级和电力电子学中的PWM整流器和逆变器的相关理论，计算得到与本发明密切相关的几个主要电气参数如下表1所示，计算过程中忽略了整流侧输入电感L1上的压降：3) According to the voltage level of the current disturbance source output connection busbar and the related theory of PWM rectifier and inverter in power electronics, several main electrical parameters closely related to the present invention are calculated as shown in Table 1 below. During the calculation process Neglecting the voltage drop across the input inductor L1 on the rectifier side:
表1Table 1
由于逆变侧在不同电压等级下其输出电流不同(为保证电流扰动源容量一致)，逆变侧输出电感L2上的压降也不同，而且其压降也与L2的具体设计值密切相关，因此本发明说明书中的表1只给出了逆变侧调制比的一个范围。Since the output current of the inverter side is different at different voltage levels (in order to ensure that the capacity of the current disturbance source is consistent), the voltage drop on the output inductor L2 of the inverter side is also different, and its voltage drop is also closely related to the specific design value of L2. Therefore, Table 1 in the description of the present invention only gives a range of the modulation ratio of the inverter side.
图4、图5和图6分别给出了本实施例5种电压等级下的拓扑结构图，采用这种拓扑无需输出变压器即可实现三相380V/600V/660V/690V/1140V电压等级的谐波电流及无功电流输出。Fig. 4, Fig. 5 and Fig. 6 respectively show the topological structure diagrams under the five voltage levels of this embodiment. Using this topology can realize the harmonic of three-phase 380V/600V/660V/690V/1140V voltage levels without output transformer. Wave current and reactive current output.
本发明中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。The specific embodiments described in the present invention are only to illustrate the spirit of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.
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