基于储能微分控制的AC /DC系统联络线惯性补偿策略

Inertia Compensation Strategy of AC/DC System Tie Line Based on Energy Storage Differential Control

在交直流混联电力系统中提出了一种利用储能微分控制补偿直流联络线惯性的策略。首先,通过对AC/DC传输模型及直流联络线惯性特征的分析,构建了考虑惯性补偿的两区域交直流混联AGC系统模型;然后,利用储能输出控制改变直流联络线传输功率,形成联络线功率变化的惯性表现;在此基础上,针对储能提取过程中电容值会对直流电压产生负面影响的问题,设计了叠加储能微分的惯性补偿控制策略,以提高系统的惯性响应能力;最后,通过不同负载扰动偏差与联络线过载率的仿真对比,验证了所提方法的可行性和有效性。

A strategy of compensating DC tie line inertia by differential control of energy storage was proposed in this paper.First,through the analysis of AC/DC transmission model and the inertia characteristics of DC tie line,a two zone AC/DC hybrid AGC system model considering inertia compensation was constructed.Then,energy storage output control was proposed to change the transmission power of DC tie line to form the inertia performance of tie line power change.On this basis,aiming at the negative effect of capacitance value on DC voltage in the process of energy storage extraction,the inertia compensation control strategy with superimposed energy storage differential was designed to improve the inertial response ability of the system.Finally,the feasibility and effectiveness of the proposed method were verified by comparing the simulation results of different load disturbance deviations and tie line overload rates.