雙饋式風電場多階段無功電壓控制策略

文獻標志碼：A

雙饋式風電場多階段無功電壓控制策略

盛四清，陳安，楊少波

(華北電力大學(xué)電氣與電子工程學(xué)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：為了應(yīng)對大規(guī)模風電接入電網(wǎng)引起的電壓穩(wěn)定問題，提出了一種新型的多階段無功電壓協(xié)調(diào)控制策略。該策略首先基于風功率預(yù)測數(shù)據(jù)對電容器組的投切進行提前優(yōu)化；穩(wěn)態(tài)運行時，通過分析雙饋風力機的PQ關(guān)系曲線，優(yōu)先調(diào)整風電機組無功出力以實現(xiàn)對風電場的無功調(diào)控；電網(wǎng)故障時充分發(fā)揮靜止無功補償器的調(diào)節(jié)能力，并在故障切除后限制其出力以避免電壓過沖，從而整體上實現(xiàn)無功電壓的協(xié)調(diào)控制。最后以某一風電場系統(tǒng)的仿真結(jié)果驗證了上述策略的有效性和可行性。

關(guān)鍵詞：雙饋感應(yīng)發(fā)電機；電容器組投切；靜止無功補償器；協(xié)調(diào)控制；多階段

文章編號：1007-2322(2015)05-0089-06

中圖分類號：TM614

收稿日期：2014-12-28

作者簡介：

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

近年來，風電場并網(wǎng)容量不斷增加，特別是現(xiàn)階段我國風電開發(fā)采用大規(guī)模、高集中的模式，然而風電場多建于電網(wǎng)末端，電網(wǎng)中存在各種穩(wěn)態(tài)、瞬態(tài)、輕度、嚴重、對稱、不對稱故障和各類電力諧波，使得并網(wǎng)風力發(fā)電機組的運行環(huán)境非常惡劣和非理想化，這就對風電并網(wǎng)后無功電壓的運行控制策略提出了更高的要求[1]。在此背景下，雙饋風電機組以其PQ解耦控制能力及良好的無功功率調(diào)節(jié)性能，逐步取代籠型風電機組并成為主流機型。采用雙饋感應(yīng)發(fā)電機的風電場能夠為電網(wǎng)提供電壓支撐[2-3]，可提高電網(wǎng)系統(tǒng)的運行穩(wěn)定性，實現(xiàn)發(fā)電機安全、快捷的柔性并網(wǎng)。……