论文部分内容阅读
针对特高压大功率直流馈入上海电网后可能带来的低谷时段调峰问题,结合上海电网自身网络结构特性和电源特性,以调峰盈余为目标,考虑500k V联变潮流及机组出力上下限约束,建立了低负荷运行方式下调峰优化的线性规划模型,计算得出上海电网2014年夏季低谷最小调峰缺口。同时提出“调峰阻塞”概念,以调停机组为手段,以减少“调峰阻塞”为目标,建立了基于混合整数规划的调峰优化模型,计算得出调停机组后的系统最大调峰能力。最后提出了特高压直流参与调峰及优化直流分电比例两个外部措施,并对包括调停机组在内的三种措施进行优劣对比,给出了提高上海电网调峰性能的建议。
Aiming at the peak shaving problem during the trough period after the UHV DC power is fed into Shanghai Power Grid, considering the structural characteristics and power characteristics of Shanghai Power Grid itself and taking the peak-to-peak surpluses as the objective, considering the 500kV variable power flow and the upper and lower limits of unit output Constraint, a linear programming model for peak load optimization under low load operation mode was established, and the minimum trough gap of 2014 trough in Shanghai Power Grid was calculated. At the same time, the concept of “peak blocking” was put forward. Based on the mediation of units, aiming at the reduction of “peak blocking”, a peak-shaving optimization model based on mixed integer programming was established and the maximum system after the unit was adjusted Peak regulation capacity. Finally, two external measures of UHVDC involved in peak shaving and optimization of DC distribution ratio are put forward. The advantages and disadvantages of three measures including the mediation unit are compared, and the suggestions to improve the peaking performance of Shanghai power grid are given.