技术领域technical field
本发明属于光伏发电领域，具体涉及一种锂电光伏储能并网供电系统。The invention belongs to the field of photovoltaic power generation, and in particular relates to a lithium battery photovoltaic energy storage grid-connected power supply system.
背景技术Background technique
太阳能是一种被公认的可以取之不尽用之不竭的新型能源之一，但太阳能的并网会对电网的安全性能带来影响，必须有先进的储能并网系统技术作支撑。储能并网系统很大程度上解决了新能源发电的随机性及波动性问题，通过调节新能源发电引起的电网电压、频率及相位的变化，使太阳能发可靠地并入常规电网。现有的光伏储能系统，一般是采用铅酸蓄电池作为传统储能装置，铅酸蓄电池存在储能效率较低、储存能量密度低、体积大以及使用寿命短等技术缺陷。Solar energy is recognized as one of the inexhaustible new energy sources, but the grid connection of solar energy will have an impact on the safety performance of the grid, and it must be supported by advanced energy storage grid connection system technology. The energy storage grid-connected system largely solves the randomness and volatility of new energy power generation. By adjusting the grid voltage, frequency and phase changes caused by new energy power generation, solar power can be reliably integrated into the conventional power grid. Existing photovoltaic energy storage systems generally use lead-acid batteries as traditional energy storage devices. Lead-acid batteries have technical defects such as low energy storage efficiency, low energy storage density, large volume, and short service life.
为了提高电网对光伏储能系统的接纳能力，增强电网的兼容性，减小系统体积及提高储能密度，锂电光伏储能并网系统设计成为必然趋势。In order to improve the grid's ability to accept photovoltaic energy storage systems, enhance grid compatibility, reduce system volume and increase energy storage density, the design of lithium-ion photovoltaic energy storage grid-connected systems has become an inevitable trend.
目前，光伏储能系统只是在光照充足的时候进行储能，而在市电的用电低谷阶段却不能实现储能，导致在光照不足或连续阴雨天时，导致储能系统不能得到充足利用，在需要用电或用电高峰期，储能系统无法提供足够的能量。At present, the photovoltaic energy storage system only performs energy storage when there is sufficient sunlight, but it cannot realize energy storage during the low power consumption period of the utility power, resulting in insufficient utilization of the energy storage system when the sunlight is insufficient or continuous rainy days. The energy storage system cannot provide enough energy when electricity is needed or during peak hours.
发明内容Contents of the invention
本发明的目的是提供一种锂电光伏储能并网供电系统，以解决现有供电系统电能供需不平衡的问题。The purpose of the present invention is to provide a grid-connected lithium battery photovoltaic energy storage power supply system to solve the problem of unbalanced supply and demand of electric energy in the existing power supply system.
为了实现以上目的，本发明所采用的技术方案是：一种锂电光伏储能并网供电系统，包括锂电池组和光伏阵列，所述锂电池组用于通过双向AC/DC变换器与市电双向连接，还通过DC/DC变换器与光伏阵列连接；锂电池组连接有储能电池管理系统，光伏阵列连接有光伏电池管理系统；所述储能电池管理系统与电池架监控单元通讯连接，双向AC/DC变换器与对应的双向AC/DC变换器监控单元双向通讯连接，DC/DC变换器与对应的DC/DC变换器监控单元双向通讯连接。In order to achieve the above objectives, the technical solution adopted in the present invention is: a lithium battery photovoltaic energy storage grid-connected power supply system, including a lithium battery pack and a photovoltaic array, and the lithium battery pack is used to communicate with the mains through a bidirectional AC/DC Two-way connection, also connected to the photovoltaic array through the DC/DC converter; the lithium battery pack is connected to the energy storage battery management system, and the photovoltaic array is connected to the photovoltaic battery management system; the energy storage battery management system is connected to the battery rack monitoring unit through communication, The bidirectional AC/DC converter is bidirectionally connected to the corresponding bidirectional AC/DC converter monitoring unit, and the DC/DC converter is bidirectionally connected to the corresponding DC/DC converter monitoring unit.
所述电池架监控单元、双向AC/DC变换器监控单元、DC/DC变换器监控单元均与后台监控单元连接。The battery rack monitoring unit, the two-way AC/DC converter monitoring unit, and the DC/DC converter monitoring unit are all connected to the background monitoring unit.
所述电池架监控单元、双向AC/DC变换器监控单元、DC/DC变换器监控单元均通过网络交换机与后台监控单元连接。The battery rack monitoring unit, the two-way AC/DC converter monitoring unit, and the DC/DC converter monitoring unit are all connected to the background monitoring unit through a network switch.
该供电系统还包括与光伏电池管理系统通讯连接的环境检测仪。The power supply system also includes an environment detector communicated with the photovoltaic battery management system.
所述环境检测仪通过网络交换机与后台监控单元通讯连接。The environment detector communicates with the background monitoring unit through a network switch.
所述双向AC/DC变换器与双向AC/DC变换器监控单元和DC/DC变换器与DC/DC变换器监控单元的双向通讯方式均为CAN通讯。The two-way communication between the bidirectional AC/DC converter and the bidirectional AC/DC converter monitoring unit and the DC/DC converter and the DC/DC converter monitoring unit are both CAN communication.
所述双向AC/DC变换器、DC/DC变换器还与电池管理系统或电池架监控单元通讯连接。The bidirectional AC/DC converter and DC/DC converter are also connected in communication with the battery management system or the battery rack monitoring unit.
本发明的锂电光伏储能并网供电系统可以通过DC/DC变换器及双向AC/DC变换器给锂电池组充电；锂电池组也可以通过双向AC/DC变换器向电网放电，采用交直流一体结构，将光伏储能和并网技术充分结合，协调控制，实现光伏储能和并网技术的智能控制，在用电低谷时期或光照充足时对电池组进行充电储能，在用电高峰时期或其他需要用电时期并网发电，解决了电能供需不平衡的问题，作为电网的有效补充，对电网起到调峰填谷作用，系统体积小，使用寿命长，具有光伏储能具有最大功率跟踪功能及全天候工作效应。The lithium photovoltaic energy storage grid-connected power supply system of the present invention can charge the lithium battery pack through the DC/DC converter and the bidirectional AC/DC converter; the lithium battery pack can also discharge to the grid through the bidirectional AC/DC converter, using AC/DC The integrated structure fully combines photovoltaic energy storage and grid-connected technology, coordinates control, and realizes intelligent control of photovoltaic energy storage and grid-connected technology. Grid-connected power generation during periods or other periods when electricity is needed solves the problem of unbalanced power supply and demand. As an effective supplement to the grid, it plays a role in peak regulation and valley filling for the grid. The system is small in size and long in service life. Power tracking function and all-weather working effect.
附图说明Description of drawings
图1为本发明锂电光伏储能并网系统实施例原理框图；Fig. 1 is a schematic block diagram of an embodiment of a lithium battery photovoltaic energy storage grid-connected system of the present invention;
图2为本发明系统的模式1工作的示意图；Fig. 2 is the schematic diagram of mode 1 work of the system of the present invention;
图3为本发明系统的模式2工作的示意图；Fig. 3 is the schematic diagram of mode 2 work of the system of the present invention;
图4为本发明系统的模式3工作的示意图；Fig. 4 is the schematic diagram of mode 3 work of the system of the present invention;
图5为本发明系统的模式4工作的示意图；Fig. 5 is the schematic diagram of mode 4 work of the system of the present invention;
图6为本发明系统的模式5工作的示意图。Fig. 6 is a schematic diagram of mode 5 operation of the system of the present invention.
具体实施方式Detailed ways
下面结合附图及具体的实施例对本发明进行进一步介绍。The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.
如图1所示为本发明锂电光伏储能并网供电系统实施例的原理图，由图可知，该供电系统包括锂电池组和光伏阵列，锂电池组用于通过双向AC/DC变换器与电网双向连接，还通过DC/DC变换器与光伏阵列连接；锂电池组连接有储能电池管理系统，光伏阵列连接有光伏电池管理系统；储能电池管理系统与电池架监控单元通讯连接，双向AC/DC变换器与对应的双向AC/DC变换器监控单元双向通讯连接，DC/DC变换器与对应的DC/DC变换器监控单元双向通讯连接，进行通讯、控制及显示功能。Figure 1 is a schematic diagram of an embodiment of a lithium photovoltaic energy storage grid-connected power supply system according to the present invention. It can be seen from the figure that the power supply system includes a lithium battery pack and a photovoltaic array. The power grid is bidirectionally connected, and is also connected to the photovoltaic array through a DC/DC converter; the lithium battery pack is connected to the energy storage battery management system, and the photovoltaic array is connected to the photovoltaic battery management system; the energy storage battery management system is connected to the battery rack monitoring unit through communication, bidirectional The AC/DC converter is bidirectionally connected to the corresponding bidirectional AC/DC converter monitoring unit, and the DC/DC converter is bidirectionally connected to the corresponding DC/DC converter monitoring unit for communication, control and display functions.
电池架监控单元、双向AC/DC变换器监控单元、DC/DC变换器监控单元均通过网络交换机与后台监控单元连接，进行以太网通讯，后台监控单元实时显示系统的工作状态及环境情况。The battery rack monitoring unit, the two-way AC/DC converter monitoring unit, and the DC/DC converter monitoring unit are all connected to the background monitoring unit through a network switch for Ethernet communication. The background monitoring unit displays the working status and environmental conditions of the system in real time.
该供电系统还包括与光伏电池管理系统通讯连接的环境检测仪，该环境检测仪检测光伏阵列所处的环境信息，并通过网络交换机与后台监控单元通讯连接，将信息上报后台监控单元。The power supply system also includes an environment detector communicated with the photovoltaic battery management system. The environment detector detects the environment information of the photovoltaic array, communicates with the background monitoring unit through a network switch, and reports the information to the background monitoring unit.
本实施例的锂电池组由多个单体电池串并联构成，储能电池管理系统实时监测单体电池信息，并上送电池架监控单元；光伏电池管理系统实现光伏阵列的最大功率控制。The lithium battery pack in this embodiment is composed of multiple single cells connected in series and parallel. The energy storage battery management system monitors the information of the single cells in real time and sends them to the battery rack monitoring unit; the photovoltaic battery management system realizes the maximum power control of the photovoltaic array.
另外，双向AC/DC变换器、DC/DC变换器还与电池管理系统(如图1所示)或电池架监控单元通讯连接，用于采集电池组的电池信息，根据相关的SOC等数据调整对电池组进行充电时的控制参数，例如充电电流、充电时间等。In addition, the bidirectional AC/DC converter and DC/DC converter are also connected to the battery management system (as shown in Figure 1) or the battery rack monitoring unit for collecting battery information of the battery pack, and adjusting the battery according to relevant SOC data. Control parameters when charging the battery pack, such as charging current, charging time, etc.
本发明锂电光伏储能并网供电系统的控制策略为：当用电低谷期或有光照的时期，双向AC/DC变换器或DC/DC变换器向电池组充电；当用电高峰期且有光照时，光伏阵列通过DC/DC变换器向电池组充电，锂电池组经双向AC/DC变换器放电并入电网；当用电高峰期且无光照时，光伏阵列及DC/DC变换器停止工作，锂电池组经双向AC/DC变换器放电并入电网，该策略包括多种工作模式，具体的工作过程和原理如下：The control strategy of the lithium battery photovoltaic energy storage grid-connected power supply system of the present invention is: when the power consumption is low or there is light, the bidirectional AC/DC converter or DC/DC converter charges the battery pack; When there is light, the photovoltaic array charges the battery pack through the DC/DC converter, and the lithium battery pack is discharged into the grid through the bidirectional AC/DC converter; when there is no light during the peak period of power consumption, the photovoltaic array and DC/DC converter stop Working, the lithium battery pack is discharged into the grid through a bidirectional AC/DC converter. This strategy includes a variety of working modes. The specific working process and principle are as follows:
模式1：仅光伏对锂电池组进行储能：当光照充足且用电负荷不需储能电池系统供电时，光伏阵列通过DC/DC变换器对锂电池组进行充电储能，且实现光伏阵列的最大功率跟踪控制，能量流动如图2实线所示。Mode 1: Only photovoltaics store energy on the lithium battery pack: when the light is sufficient and the power load does not require power from the energy storage battery system, the photovoltaic array charges and stores the lithium battery pack through a DC/DC converter, and realizes the photovoltaic array The maximum power tracking control, the energy flow is shown in Figure 2 as a solid line.
模式2：仅市电对电池组储能：当夜间或连续阴雨等无光照情况下，且用电处在低谷时期时，市电通过AC/DC变换器对锂电池组进行充电储能，能量流动如图3实线所示。Mode 2: Only the mains power stores energy for the battery pack: when there is no light at night or continuous rain, and the power consumption is in a low period, the mains power charges and stores the lithium battery pack through the AC/DC converter, and the energy The flow is shown in Figure 3 as a solid line.
模式3：光伏和市电同时对光伏储能：当光照充足且用电处在低谷时期时，光伏阵列通过DC/DC变换器对锂电池组进行充电储能，且实现光伏阵列的最大功率跟踪；市电通过AC/DC变换器对锂电池组进行充电储能，能量流动如图4实线所示。Mode 3: Photovoltaic and mains electricity simultaneously store photovoltaic energy: when the sunlight is sufficient and power consumption is at a low point, the photovoltaic array charges and stores lithium battery packs through a DC/DC converter, and realizes maximum power tracking of the photovoltaic array ; The commercial power charges and stores the lithium battery pack through the AC/DC converter, and the energy flow is shown by the solid line in Fig. 4 .
模式4：锂电池组仅处于并网运行：当夜间或连续阴雨等无光照情况下，且处于用电高峰，锂电池组通过AC/DC变换器实现并网，达到补充电网的作用，能量流动如图5实线所示。Mode 4: The lithium battery pack is only in grid-connected operation: when there is no light at night or continuous rainy conditions, and it is at the peak of power consumption, the lithium battery pack is connected to the grid through the AC/DC converter to supplement the grid, and the energy flows As shown by the solid line in Figure 5.
模式5：光伏对锂电池组储能同时锂电池组并网运行：当光照充足且在用电高峰期时，光伏阵列通过DC/DC变换器对锂电池组进行充电储能，且实现光伏阵列的最大功率跟踪；锂电池组通过AC/DC变换器实现并网，达到补充电网的作用，能量流动如图6实线所示。Mode 5: Photovoltaic energy storage for lithium battery packs and grid-connected operation of lithium battery packs: when the sunlight is sufficient and during the peak period of power consumption, the photovoltaic array charges and stores lithium battery packs through a DC/DC converter, and realizes the photovoltaic array The maximum power tracking; the lithium battery pack is connected to the grid through the AC/DC converter to supplement the grid. The energy flow is shown in the solid line in Figure 6.
以上实施例仅用于帮助理解本发明的核心思想，不能以此限制本发明，对于本领域的技术人员，凡是依据本发明的思想，对本发明进行修改或者等同替换，在具体实施方式及应用范围上所做的任何改动，均应包含在本发明的保护范围之内。The above embodiments are only used to help understand the core idea of the present invention, and cannot limit the present invention with this. For those skilled in the art, any modification or equivalent replacement of the present invention based on the idea of the present invention, in the specific implementation mode and application scope Any changes made above should be included within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410290950.2ACN104124702A (en) | 2014-06-25 | 2014-06-25 | Lithium photovoltaic energy-storing grid-connected power supply system |
| Application Number | Priority Date | Filing Date | Title |
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| CN201410290950.2ACN104124702A (en) | 2014-06-25 | 2014-06-25 | Lithium photovoltaic energy-storing grid-connected power supply system |
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| CN201410290950.2APendingCN104124702A (en) | 2014-06-25 | 2014-06-25 | Lithium photovoltaic energy-storing grid-connected power supply system |
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