直流整流站动态无功特性解析及优化措施

发布时间：2018-03-09 15:59

本文选题：直流　切入点：整流站　出处：《中国电机工程学报》2014年28期 　论文类型：期刊论文

【摘要】：受过渡期送端交流网架结构薄弱支撑能力不足、配套电源建设滞后导致局部功率大量汇集,以及强直弱交型混联电网稳定瓶颈约束等因素影响,大扰动后直流整流站动态无功特性将会显著影响交流电压和直流功率恢复,进而影响混联电网受扰稳定特性。因此,提高直流机电暂态仿真精准性,提升交直流混联电网特性认知能力,以及优化直流控制参数缓解扰动冲击,是具有重要现实意义的课题。解析了整流器和整流站的动态无功非线性轨迹特征,并分析了低压限流启动值、定功率环节测量时间常数以及整流器控制方式对动态无功轨迹的影响。华北与华中特高压交直流混联电网仿真结果表明,正确设置直流仿真参数对精准评价混联电网动态行为特性具有重要意义;验证了直流控制器参数优化缓解故障对跨区互联电网冲击的作用。
[Abstract]:Affected by the weak supporting capacity of the AC grid structure in the transitional period, the local power gathering caused by the lagging of the supporting power supply, and the bottleneck constraints of the stability of the strong and weak AC hybrid power network, The dynamic reactive power characteristics of DC rectifier station after large disturbance will significantly affect the AC voltage and DC power recovery, and then affect the disturbed stability of the hybrid power network. Therefore, the accuracy of DC electromechanical transient simulation can be improved. It is of great practical significance to improve the cognitive ability of AC / DC hybrid power network and to optimize DC control parameters to mitigate disturbance impact. The nonlinear trajectory characteristics of rectifier and rectifier are analyzed. The influence of low voltage current limiting start-up value, measuring time constant of fixed power link and rectifier control mode on dynamic reactive power trajectory is analyzed. The simulation results of UHV AC / DC hybrid power grid in North China and Central China show that, The correct setting of DC simulation parameters is of great significance for accurate evaluation of dynamic behavior characteristics of hybrid power systems, and the effect of DC controller parameters optimization to mitigate the impact of faults on cross-region interconnected power grids is verified.
【作者单位】：中国电力科学研究院;西北电力设计院;新疆哈密电业局;
【基金】：国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001-2012)~~
【分类号】：TM721.1

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