微电网的多重主从控制策略研究

摘要

针对下垂控制在负荷需求变化时其电压及频率偏移额定值较大的缺陷，提出了一种具有混合输出特性的逆变电源控制方法。该控制方法结合了现有下垂控制和V/f控制两者的特点，较好地克服了各自的缺点。基于该逆变电源控制方法提出了一种新的多重主从控制策略，该控制策略不需要通信，可自行按照预设的裕度相互配合运行，克服了对等控制及基于单个V/f的主从控制策略的不足。利用DIgSILENT软件搭建了微电网的仿真模型并对其进行了验证，结果证明了所提出的逆变电源控制方法和多重主从控制策略的正确性和可行性。%According to the shortcoming of the droop control that it’s difficult to keep rated frequency or voltage amplitude small deviation in island operation mode when the load changes, a new control method of inverter source with mixed output characteristics is proposed. It combines the characteristics of V/f control and droop control, and overcomes the shortcoming of the two methods respectively. A new multiple master-slave control strategy is proposed based on the new control method of inverter source. The strategy can operate by itself automatically according to the default margin without telecommunication, and overcome the shortcoming of the peer to peer control and the master-slave control based on single V/f source. Finally, a simulation model for micro-grid is developed on the DIgSILENT software, the control method of inverter source and the multiple master-slave control strategy of micro-grid are tested. The correctness and feasibility are verified by the simulation result.