含同步调相机的直流换流站稳态无功协调控制策略

网源稳态调压方式会对系统动态无功支撑能力产生直接影响。针对特高压弱受端电网电压稳定性下降的问题，提出了一种直流换流站内滤波电容欠补偿、同步调相机迟相运行的稳态无功协调控制策略。同步调相机自动电压控制(AVC)子站作为控制中枢，与直流控保系统进行运行信息、动作指令信息和动作报文信息通信，以交直流系统无功交换量为控制目标，通过同步调相机与滤波电容无功置换，达到减少滤波电容投入组数、增加同步调相机稳态无功出力的目的，从源头上减少交流电压跌落导致的直流换流站无功补偿缺额。基于雅中—江西特高压直流投运后的江西电网规划数据，在PSASP仿真平台上开展潮流计算与暂态稳定分析。不同工况下的仿真结果表明，所提协调控制策略可以有效降低弱受端电网电压失稳的风险，提升直流功率的消纳能力。

Steady-state reactive power coordinated control strategy for DC converter station with synchronous condenser

The dynamic reactive power supporting capability is directly affected by the source-grid steady-state voltage regulation schemes. For the problem of voltage stability degradation of ultra-high voltage weak receiving-side grid, a steady-state reactive power coordinated control strategy based on under-compensation of filter capacitor and late-phase operation of synchronous condenser in DC converter station is proposed. AVC(Automatic Voltage Control) substation of synchronous condenser is used as the control center to communicate operation information, action command information and action message information with the DC control and protection system. Taking the reactive power exchange capacity between AC and DC system as the control object, through the reactive power replacement of synchronous compensator and filter capacitors, the number of input groups of filter capacitors decreases and the steady-state reactive power output of the synchronous condenser increases, which can reduce the reactive power vacancy caused by the AC voltage drop from the source. Based on the planning data of Jiangxi power grid with Yazhong-Jiangxi ultra-high voltage DC commissioning, power flow calculation and transient stability analysis are carried out on PSASP simulation platform. The simulative results in different working conditions show that the proposed coordinated control strategy can reduce the voltage instability risk of weak receiving-side grid and improve the absorption capacity of DC power.