文献标志码：A

双馈式风电场多阶段无功电压控制策略

盛四清，陈安，杨少波

(华北电力大学电气与电子工程学院，河北保定071003)

Multi-stage Reactive Power and Voltage Control Strategy of DFIG Based on Wind FarmsSHENG Siqing，CHEN An，YANG Shaobo

(School of Electrical and Electronic Engineering，North China Electric Power University，Baoding 071003，China)

摘要：为了应对大规模风电接入电网引起的电压稳定问题，提出了一种新型的多阶段无功电压协调控制策略。该策略首先基于风功率预测数据对电容器组的投切进行提前优化；稳态运行时，通过分析双馈风力机的PQ关系曲线，优先调整风电机组无功出力以实现对风电场的无功调控；电网故障时充分发挥静止无功补偿器的调节能力，并在故障切除后限制其出力以避免电压过冲，从而整体上实现无功电压的协调控制。最后以某一风电场系统的仿真结果验证了上述策略的有效性和可行性。

关键词：双馈感应发电机；电容器组投切；静止无功补偿器；协调控制；多阶段

文章编号：1007-2322(2015)05-0089-06

中图分类号：TM614

收稿日期：2014-12-28

作者简介：

Abstract：In order to solve the voltage stability issue caused by large-scale wind farm integrated power grid, a new multi-stage coordinated control strategy of reactive power and voltage is proposed. The switching scheme of capacitor bank is pre-performed based on the predicted wind power firstly. Then in steady state, the reactive power of wind farm is regulated to control the reactive power and voltage by analyzing the relation between active power and reactive power of DFIG. In addition, SVC is controlled to make full use of its reactive power capability in fault state, and the voltage overshoot is avoided by limited power output after fault, which show the effectiveness of coordinated control reactive power and voltage overall. In the end, the validity and feasibility of proposed scheme are verified by simulation results of a practical wind farm.

Keywords：doubly-fed induction generator; switching of capacitor bank; static var compensator; coordinated control; multi-stage

0引言

近年来，风电场并网容量不断增加，特别是现阶段我国风电开发采用大规模、高集中的模式，然而风电场多建于电网末端，电网中存在各种稳态、瞬态、轻度、严重、对称、不对称故障和各类电力谐波，使得并网风力发电机组的运行环境非常恶劣和非理想化，这就对风电并网后无功电压的运行控制策略提出了更高的要求[1]。在此背景下，双馈风电机组以其PQ解耦控制能力及良好的无功功率调节性能，逐步取代笼型风电机组并成为主流机型。采用双馈感应发电机的风电场能够为电网提供电压支撑[2-3]，可提高电网系统的运行稳定性，实现发电机安全、快捷的柔性并网。……