含风电接入的省地双向互动协调无功电压控制

Reactive Voltage Control of Bidirectional-interaction Coordination Between Provincial and District Power Networks with Wind Power Integration

为应对规模化风电接入对电网无功电压运行和控制的影响,结合现场实际,提出并实现了一种跨电压等级风电汇集区域风电场与传统电厂的无功电压协调控制方法。在控制中心内,研究并提出计及风功率波动和电网N-1安全约束的敏捷电压控制方法,该方法通过控制周期和控制模型的自适应调整,充分挖掘省调直控风电场的无功电压调节能力,抑制风电波动对电网电压的影响,保留足够的传统发电机动态无功储备。在控制中心间,研究并提出计及风电场调节能力的省地双向互动协调控制方法,通过地区电网内风电场与地调直控变电站的协调控制,发挥地调直控风电场的调节能力,减少地调直控变电站的电容电抗器动作次数,通过省地双向互动协调,协调省地双方无功调节资源,支撑末端地区电网电压,提高电网整体运行的安全性和经济性。所研发的实际控制系统已在江苏电网应用,仿真运行和实际闭环结果证明了该方法的有效性。

An agile and coordinated voltage control method is proposed to deal with the power system reactive power and voltage operation with large scale wind power integration. In the provincial control center, the agile voltage control method with the wind power volatility and the power system N--1 security constraints taken into account is proposed. With this method, by means of the adaptive adjustment of the control period and control model, the wind farm reactive ability will be fully tapped to suppress the influence of wind fluctuations on the bus voltage while sufficient dynamic reactive power regulation margin of traditional generators will be retained. Between provincial and prefectural control centers, the bidirectional interaction based voltage control method is presented to support the voltage at the terminal power network while bypassing the unnecessary discrete device action on the prefectural grid. By coordinated voltage control among the wind farms and substations in the provincial power system, the control abilities of its own wind farms will be made full use of, there will be less capacitor and reactor action times in its own substations and unnecessary reactive power flow. By the bidirectional interaction between provincial and prefectural control centers, the distributed adjustment resources can well be used to support the voltage at the terminal power network and increase the safety and economy of overall operation of the power system. The wind automatic voltage control system is currently in real-time operation in Jiangsu power system.