【摘要】 基于下垂机制的含多并联逆变器微电网联络线功率控制策略的控制层级较多,层级间时间尺度相差较大,导致其暂态响应较差,应对本地负荷波动或下垂系数调整等扰动的能力不强。针对以上问题,提出了一种新型的含多并联逆变器微电网联络线功率分层控制策略。一层分散控制采用电压滤波跟踪误差的方法对系统公共耦合点(Point of Common Connection, PCC)电压进行快速精确的控制。二层系统级集中控制通过直接调节PCC电压幅值和相位,实现微电网与主网之间或互联微电网间特定的功率交换,而其内部各逆变器则按照功率分配系数精确分配有功和无功功率。离线仿真和实时硬件在环实验验证了所提控制策略的有效性和优越性。更多还原

【Abstract】 The droop mechanism based tie-line power control strategy for a microgrid with multi-parallel connected inverters has many control levels and the time scales between the levels are quite different. This leads to poor transient response and weak ability to deal with disturbance such as local load fluctuation or droop coefficient adjustment. To solve these problems, a new type of hierarchical control strategy for the tie-line power of microgrid with multi-parallel connected inverters is proposed. The decentralized control of the first level adopts the method of voltage filtering tracking error to control the voltage at the Point of Common Connection(PCC) of the system rapidly and accurately. The centralized control of the second level realizes specific power exchange between the microgrid and the main grid or between interconnected microgrids by directly adjusting the voltage amplitude and phase at the PCC. The internal inverters accurately distribute the active and reactive power according to the power distribution coefficient. The effectiveness and superiority of the proposed control strategy are verified by offline simulation and real-time hardware-in-loop experiments.更多还原