CAJ | 학술논문

运行经验表明，长距离的华中华北互联电力系统间特高压联络线容易遭受扰动影响，产生大幅度、长周期的功率摇摆。而过高的功率摇摆峰值，很可能导致互联系统第一摇摆失稳的问题。针对该问题，首先设计了一种基于最大上升斜率的摇摆峰值预测算法；接着根据预测的峰值，提出一种采用直流紧急控制的特高压联络线功率摇摆峰值抑制方法；最后，建立了直流紧急控制的自定义模型并对控制方案进行仿真验证。结果表明，摇摆峰值预测算法具备较高的准确性，直流紧急控制策略也能充分地削弱特高压联络线功率摇摆峰值，从而有效提高特高压联络线的输电能力和互联系统的暂态稳定性。同时，该直流紧急控制策略实现简单，对不同扰动都具备较好的适应性，具有较高的工程实用价值。
운행경험표명，장거리적화중화북호련전력계통간특고압련락선용역조수우동영향，산생대폭도、장주기적공솔요파。이과고적공솔요파봉치，흔가능도치호련계통제일요파실은적문제。침대해문제，수선설계료일충기우최대상승사솔적요파봉치예측산법；접착근거예측적봉치，제출일충채용직류긴급공제적특고압련락선공솔요파봉치억제방법；최후，건립료직류긴급공제적자정의모형병대공제방안진행방진험증。결과표명，요파봉치예측산법구비교고적준학성，직류긴급공제책략야능충분지삭약특고압련락선공솔요파봉치，종이유효제고특고압련락선적수전능력화호련계통적잠태은정성。동시，해직류긴급공제책략실현간단，대불동우동도구비교호적괄응성，구유교고적공정실용개치。
It is observed that the long-distance ultra-high voltage (UHV) tie-line, which connects the Central and North China power grid, is quite vulnerable to disturbances, exhibiting a high magnitude and long cycle power swing. Especially the high swing peak could cause instability problem during the first swing period. This paper designed a swing peak prediction algorithm by the use of maximum rising slope, and proposed a swing peak suppression strategy of UHV tie-line power flow based on high voltage direct current (HVDC) emergency control. Finally, the controller was modelled for simulation and validation. The conclusions show that the swing peak prediction algorithm has a good precision and HVDC emergency control can effectively suppress the swing peak. Therefore, it can significantly improve the transmission capacity of UHV tie-line and transient stability of interconnected power system. Furthermore, the proposed control strategy, which is easy to implement, has better adaptability when dealing with different disturbances, and announcing a big progress toward field test of the proposed control strategy.