含多光储VSG单元孤岛微网参数自适应功率协调与频率优化控制

虚拟同步发电机（VSG）技术因能增加惯性、改善系统稳定性而在分布式发电、微网等领域愈发受到关注。但VSG逆变器并联运行时，通常忽略直流侧分布式电源特性，且参数大多固定不变，不能保证最大限度利用可再生能源，且系统频率动态响应较差。针对这一问题，本文提出了适用于含多光储VSG单元孤岛微网的参数自适应功率协调与频率优化控制策略。综合考虑系统负荷需求、光伏单元出力情况以及系统频率变化，自适应调节转动惯量、阻尼系数、虚拟电感等参数，确保系统各单元间功率有效分配，避免了光伏利用不充分、逆变器过载及系统交直流侧功率变动引起的频率骤变等不良影响，系统频率动态调节特性也可改善。最后，基于RT-LAB搭建了含三组光储VSG单元孤岛微网实时仿真平台，对多工况下仿真结果进行分析与对比，验证了所述控制方法的正确性及有效性。

Parameter Adaptive Power Coordination and Frequency Optimization of Islanded Microgrid with PV/Battery VSG Units

Virtual Synchronous Generator (VSG) technology has gained plenty of attention in distributed generation and microgrid systems because of increased inertia and enhanced stability. However, in current paralleled VSG-controlled inverter system, the characteristics of the DC sources are normally ignored, and the VSG parameters are mostly designed as fixed values, leading lower utilization of power at DC side along with undesirable frequency fluctuation during large disturbance of loads. This paper proposes a multi-parameter adaptive power allocation coordination & frequency optimization strategy for parallel PV/Battery-VSGs enabled microgrid. By establishing system dynamic model, the load requirements, the output of the photovoltaic unit, and the frequency variation of the system are comprehensively considered the typical parameters such as moment of inertia, damping coefficient, virtual inductance, and power reference value then could be adaptively adjusted to avoid undesirable phenomena such as insufficient utilization of photovoltaic, inverter overload, and sharp frequency fluctuation caused by AC-or DC-side power variation. In addition, the frequency response characteristics can be improved compared with fixed parameters cases. Finally, a real-time microgrid simulation test bench including three PV/battery VSGs is built based on RT-LAB. The results of mul-ti-scenarios are analyzed and compared to prove the correctness and effectiveness of the proposed method in this paper.