直流互联异步电网的HVDC与AGC协同功率分配

Collaborative dispatch algorithmfor HVDC and AGC in DC interconnected asynchronous power grid

通过HVDC连接区域电网使得系统中出现直流互联异步电网,造成区域电网之间相互支援能力减弱,文中针对区域电网出现功率扰动后的频率调整问题,提出HVDC与AGC协同功率分配方法。介绍了电力系统频率调整模型以及HVDC参与一次调频的控制策略,基于一致性算法设计HVDC与AGC协同功率分配的方法,在二次调频阶段考虑各机组与HVDC的调节成本,以调节成本作为一致性状态变量设计功率分配算法,实现HVDC与AGC的协同控制,通过HVDC的功率调整使得互联异步电网也能够根据调节成本承担部分功率不平衡量,降低互联系统整体的调节成本。通过算例仿真验证了文中所提方法的有效性。

Connecting the regional power grid through HVDC makes the DC interconnected asynchronous power grid appear in the system,which weakens the mutual support ability between the regional power grids.Aiming at the frequency adjustment problem after the power disturbance occurs in the regional power grid,the cooperative power allocation method of HVDC and AGC is proposed in this paper.Firstly,the frequency adjustment model of power system and the control strategy of HVDC participating in primary frequency regulation are introduced.Secondly,the method of cooperative power allocation between HVDC and AGC is designed based on the consensus algorithm.In the secondary frequency regulation stage,the adjustment cost of each unit and HVDC is considered,and the power allocation algorithm is designed with the adjustment cost as the consistency state variable to realize the cooperative control of HVDC and AGC.The adjustment enables the connected asynchronous power grid to bear part of the power imbalance according to the adjustment cost and reduce the overall adjustment cost of the interconnected system.The effectiveness of the proposed method is verified by an example.