新能源直流汇集分群综合协调控制策略

提出了新能源直流汇集系统分群综合协调控制策略,该策略分为功率控制和电压控制两部分.功率控制包括系统各分群内的计划功率及分群间的联络线功率控制,分群内的计划功率考虑了电网分时电价及储能的运行状态,可提高系统运行的经济性;分群间的联络线功率控制采用基于直流分群控制误差(DC group control error,DGCE...

Coordinated Control Strategy of New Energy DC Collection System

In this paper, a group of integrated of and coordinated control strategy for new energy DC collection system is proposed, which is divided into two parts: power control and voltage control. Power control includes planned power control within the group and power control of connecting lines between groups. The planned power control within the group takes into account the time-of-use price of power grid and energy storage, which can improve the economy of system operation. The connection-wire power control based on DC group control error (DGCE) is adopted for the power control of the connecting line between clusters, which not only ensures the power interchange benefit between clusters, but also realizes the independence of clustering operation as far as possible. The voltage control adopts voltage secondary control combined with droop control based on distributed consistency algorithm to make the DC collection system run at a better voltage level. Finally, MATLAB/Simulink simulation software is used to verify the operation state of DC collection system in unit working day. The results show that the economy and voltage level of the system are improved after the control strategy is adopted, and the power flow is more reasonable.