基于改进下垂控制的直流微网运行研究

doi:10.12096/j.2096-4528.pgt.21003

摘要/Abstract

摘要：

以光伏阵列发电、锂电池储能、直流负荷和网侧变换器组成的直流微网为研究对象，将整个系统分为6种运行模式，通过不同工作模式的转换运行研究该微网的协调控制策略。锂电池分为2组，为提高电池和系统整个运行效率，优化电池的工作特性，引入了能量均衡的思想，将能量均衡算法和基于蓄电池荷电状态量的下垂控制相结合，以此达到2组锂电池功率均衡的目的。利用Matlab/Simulink仿真软件搭建了该系统的仿真模型，通过改变负荷功率的大小实现系统运行的变化，仿真结果表明，直流母线电压保持恒定，整个系统的功率达到了平衡，验证了系统协调控制策略的可行性。

关键词: 直流微网, 协调控制, 能量均衡, 下垂控制

Abstract:

Taking photovoltaic array power generation, lithium battery energy storage, DC load and grid-side converter as the research objects, the whole system was divided into 6 working modes, and the coordinated control strategy of the microgrid was studied through the conversion operation of different working modes. The lithium battery was divided into two groups. In order to improve the efficiency of the battery and the whole system and optimize the working characteristics of the battery, the idea of energy balance was introduced, and the energy balance algorithm was combined with the droop control based on the state of charge value, which helped to achieve power balance of two groups of lithium batteries. The simulation model of the system was built using Matlab/Simulink software. The change of system operation was realized by changing the size of load power. The simulation results show that the DC bus voltage keeps constant, the power balance of the entire system is realized, and the feasibility of the coordinated control strategy of the system is verified.

Key words: DC microgrid, coordinated control, energy balance, droop control

中图分类号:

TK01
TM76

李靖, 王志和, 倪浩. 基于改进下垂控制的直流微网运行研究[J]. 发电技术, 2021, 42(6): 765-774.

Jing LI, Zhihe WANG, Hao NI. Research on DC Microgrid Operation Based on Improved Droop Control[J]. Power Generation Technology, 2021, 42(6): 765-774.

图/表 12

图1 直流微网结构图

Fig.1 Diagram of DC microgrid structure

图2 直流母线等效电路图

Fig.2 Diagram of DC bus equivalent circuit

图3 运行模式工作原理图

Fig.3 Working principle diagram of operating mode

图4 光伏Boost变换器控制框图

Fig.4 Control block diagram of photovoltaic Boost converter

图5 基于能量均衡的SOC下垂控制框图

Fig.5 Block diagram of SOC droop control based on energy balance

图6 恒压充放电控制框图

Fig.6 Block diagram of constant voltage charge and discharge control

图7 AC/DC变换器控制策略框图

Fig.7 Block diagram of AC/DC converter control strategy

图8 基于能量均衡SOC下垂控制仿真曲线

Fig.8 Simulation curve of SOC droop control based on energy balance

图9 运行模式1与运行模式2仿真图

Fig.9 Simulation diagram of operation mode 1 and operation mode 2

图10 运行模式2与运行模式3仿真图

Fig.10 Simulation diagram of operation mode 2 and operation mode 3

图11 运行模式4与运行模式5仿真图

Fig.11 Simulation diagram of operation mode 4 and operation mode 5

图12 运行模式5与运行模式6仿真图

Fig.12 Simulation diagram of operation mode 5 and operation mode 6

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