含风电的交直流互联电网自适应SPMC调频策略

Adaptive SPMC Frequency Modulation Strategy for AC/DC Interconnected Grid Including Wind Power

大规模风电接入交直流互联电网,对自动发电控制(automatic generation control,AGC)的控制性能及调频能力提出了更高的要求。在风电参与电力系统调频的基础上,提出基于功率调制控制器(supplementary power modulation controller,SPMC)的区域间功率补偿策略。首先,考虑到高压直流输电(high voltage direct current,HVDC)环节过载率变化的弹性特征,提出一种同时考虑功率与频率变化的自适应动态SPMC策略,使其在参与系统调频时,能有效提升HVDC中功率调整的快速性;其次,在HVDC链路主动参与系统调频的基础上,考虑风电的不确定性,利用综合惯性控制改变风电输出功率,以进一步提升系统调频性能指标。仿真结果表明,所提策略的动态功率调制特性可以有效提升区域间功率传输的针对性,并提高电网调频效果。

Connecting large-scale wind power into AC/DC interconnected grid put forward higher requirements on the control performance and frequency regulation ability of automatic generation control(abbr.AGC).On the basis of wind power participating power system frequency regulation,a supplementary power modulation controller(abbr.SPMC)based inter-regional power compensation strategy was proposed.Firstly,considering the elastic characteristics of overload rate variation in HVDC link,an adaptive dynamic SPMC strategy,in which the variation of power and frequency was considered simultaneously,was put forward.This strategy could effectively promote the rapidity of power regulation in HVDC when SMPC participated in the system frequency regulation.Secondly,based on the active participation of HVDC link in the system frequency regulation,considering the uncertainty of wind power,the integrated inertia control was utilized to change wind power output to further improve system frequency regulation performance index.Simulation results show that the dynamic power regulation characteristics of the put forward strategy can effectively enhance the pertinence of inter-regional power transmission and improve the effect of power grid frequency regulation.