风火打捆直流送出系统电压稳定控制策略

在风火打捆直流外送系统中,风电机组的调压能力、直流系统的无功电压特性及无功补偿设备都会影响系统电压稳定性,分析风火打捆直流外送系统的电压稳定性需要综合考虑风电、直流、交流系统之间的交互作用。随着直流的功率调整或发生故障,直流给风火打捆直流外送系统带来了安全稳定问题。文章分析了直流闭锁后电压暂升原因,研究了直流系统无功调节与风电机组无功电压控制的机理,提出直流、风电协调控制策略,并以黑龙江电网为例进行了仿真验证,对风火打捆直流外送系统电压稳定控制具有一定的指导意义。

Voltage Stability Control Strategy of Wind-Thermal-Bundled Power Generation and DC Transmission System

In the wind-thermal-bundled power generation and DC transmission system， the voltage regulation capability of wind turbines， the reactive power-voltage characteristics of DC system and reactive power compensation equipment will affect the voltage stability of the system. To analyze the voltage stability of wind-thermal-bundled power generation and DC transmission system， it is necessary to consider the interaction among wind power， DC and AC systems comprehensively. With DC power adjustment or failure， DC system brings safety and stability problems to the whole system. This paper analyzes the causes of voltage spike after DC blocking， studies the mechanism of reactive power regulation of DC system and control for reactive power and voltage by wind power systems， and puts forward the coordinated control strategy for wind power generation and DC transmission. It takes Heilongjiang power grid as an example to simulate and verify， which has certain guiding significance for voltage stability control of wind-thermal-bundled power generation and DC transmission system.