大型水电机组自然和调节特性对沙戈荒清洁能源大基地消纳能力的仿真分析优化OA

Aiming at the problems of small steady-state short-circuit capacity,weak anti-disturbance ability and insufficient transient overvoltage suppression ability of the clean energy base in"Shagehuang"and the near-area system of UHV DC transmission,this study proposes a solution to improve the transient stability and new ener-gy absorption capacity of the system by supporting the natural and regulation characteristics of pumped storage units and large hydropower units in the near area.The power system analysis software package(PSASP)de-veloped by China Electric Power Research Institute is used for simulation calculation,and the influence of sup-porting hydropower units on the new energy absorption capacity under the condition of DC transmission power of 6 000 MW is emphatically analyzed.The results show that the hydropower units can significantly improve the transient stability of the system by increasing the steady-state short-circuit capacity and enhancing the dynamic reactive power support(including deep leading-phase absorption of surplus reactive power,fast voltage regula-tion via automatic voltage regulation(AVR),oscillation suppression using power system stabilizer(PSS)).Under the mode of ring opening and ring closing of Qingxiang—Qingta electromagnetic ring network,the sup-porting three units can improve the new energy absorption capacity by about 1 150 MW and 1 900 MW respec-tively.The research results verify the supporting effect of hydropower units(including pumped storage units)on the transient stability and clean energy absorption of the large base system in"Shagehuang".