Secondary Control Methods Based on Distributed Event-triggered Control in Microgrids under Directed Communication Network
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摘要: 为实现微电网的灵活运行，分布式协同控制技术以其良好的灵活性、可靠性和可扩展性常被用于管控分布式可再生能源。然而，传统基于时间触发的分布式控制策略极大地浪费了分布式电源本地控制器的通信资源，降低了系统运行效率。基于此，该文提出了有向通信拓扑下基于分布式触发控制的微电网2次控制方法。通过为有功功率分配控制设计有向通信拓扑下的分布式触发机制以及为频率恢复设计本地控制器，在实现微电网2次控制目标的同时降低了系统对通信资源的需求。理论证明表明了所设计控制方法不存在芝诺现象。仿真实验结果表明了所提出的频率2次控制方法的有效性和优越性。Abstract: In order to achieve the flexible operation of microgrids, distributed cooperative control is always implemented to manage the distributed renewable energy resources within microgrids due to its better flexibility reliability and scalability. However, the time-triggered traditional distributed control strategies lead to a great waste of the communication resources of distributed generators’ local controller, and hence reduce the efficiency of microgrids’ operation. To this end, a distributed event-triggered control-based frequency secondary control method in microgrids under directed communication network is proposed. By designing an event-triggered mechanism for the active power sharing control under directed communication network and designing a local controller for the frequency restoration control, the secondary control of islanded microgrids can be achieved with greatly reduced communication resources. It is demonstrated by the theoretical analysis that the designed control method does not exist Zeno behavior. The simulation results show the effectiveness and superiority of the proposed control method.
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Key words:
- Microgrid /
- Secondary control /
- Distributed control /
- Event-triggered control
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表 1 仿真系统参数
分布式电源 DG1 & DG3 (20 kW) DG2 & DG4 (10 kW) ${m_{1\& 3}}$ $2 \times {10^{ - 5}}$ ${m_{2\& 4}}$ $4 \times {10^{ - 5}}$ ${R_{c(1\& 3)}}$ 0.2 Ω ${R_{c(2\& 4)}}$ 0.2 Ω ${L_{c(1\& 3)}}$ $3 \times {10^{ - 3}}$ H ${L_{c(2\& 4)}}$ $3 \times {10^{ - 3}}$ H 输电线 传输线 1 & 传输线 3 传输线 2 R1 & R3 0.23 Ω R2 0.35 Ω L1 & L3 $0.318 \times {10^{ - 3}}$ H L2 $1.847 \times {10^{ - 3}}$ H 负荷 负荷 1 30 kW 负荷 2 20 kW 
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