特高压双直流送端电网直流闭锁故障稳控措施研究

基于新疆电网2017年规划网架结构,±1 100 k V准东直流将作为第二条直流外送通道接入新疆送端电网。为了保障新疆送端电网的安全稳定运行,当±800 k V哈郑直流发生闭锁故障时,提出综合考虑±1 100 k V直流紧急功率支援、送端电网切机的稳控手段,分析两种不同稳控措施对于含双直流送端电网运行电压的影响。研究结果表明在满足新疆电网稳定运行前提下,稳控切机配合直流紧急功率支援能有效降低送端电网的切机量,平衡直流故障后的无功功率。该稳控措施对提高双直流送端电网的电压稳定及优化送端电网稳控切机不平衡量具有一定的参考价值。

Research of stability control strategies for UHV Double DC sending grid occur DC blocking fault

Based on the Xinjiang Power Grid Planning grid structure in 2017, Zhundong-Chongqing ± 1100kV HVDC will serve as the second delivery channel DC second access to the Xinjiang sending-end grid. In order to guarantying the security and stability of the Xinjiang sending-end grid, When Hazheng ± 800kV DC blocking fault, put forward considering the ± 1100kV emergency DC power supply, the sending-end grid of thermal power , analysis of different stability control measures of influence for containing double DC voltage of the sending-end grid. The paper results illustrate that under the premise of stable operation of Xinjiang sending-end grid, the steady control and DC power supply can effectively reduce the power cut of the power supply network, and balance the reactive power after DC fault. The stability control measures have certain reference value to improve the voltage stability of the Double DC sending-end grid and to optimize the control of the unbalance cutting power.