本文選題：微電網(wǎng) + 線路阻抗辨識�。� 參考：《高電壓技術(shù)》2017年04期

【摘要】：在孤島運行的微電網(wǎng)中,分布式電源(DG)以并聯(lián)方式運行,在其等效線路阻抗不匹配的情況下,傳統(tǒng)的下垂控制難以按無功功率-電壓的下垂方式對無功功率進(jìn)行合理分配。為此,提出了一種基于線路辨識的改進(jìn)下垂控制來消除無功功率分配的偏差。首先,詳細(xì)分析了線路參數(shù)對傳統(tǒng)下垂控制效果的影響;其次,針對單個分布式電源,構(gòu)建了基于本地信號的線路觀測環(huán)節(jié),以對分布式電源的連接等效線路阻抗進(jìn)行精確辨識,并在傳統(tǒng)下垂控制中基于線路辨識結(jié)果加入了電壓補(bǔ)償項,使它在等效線路阻抗不匹配時,仍能保持無功功率的合理分配;最后,將提出的改進(jìn)下垂控制策略應(yīng)用于一個典型的微電網(wǎng)系統(tǒng),并利用MATLAB/Simulink仿真驗證了所提方法在多工況下的正確性和有效性。仿真結(jié)果表明:所提出的主動線路觀測器可基于本地信號較精確地辨識出等效線路阻抗的實際值,基于該線路辨識結(jié)果,可有效對DG等效連接線路的不匹配電壓降進(jìn)行補(bǔ)償,從而實現(xiàn)無功功率的合理分配;該改進(jìn)方案無需依靠實時通信系統(tǒng)交換各DG源間的信息,也不需要利用中央控制器發(fā)送同步信號來保持改進(jìn)控制啟動的同步性。研究結(jié)果證明了所提改進(jìn)下垂控制策略的有效性。
[Abstract]:In the isolated microgrid, the distributed power generation (DG) is operated in parallel. When the equivalent line impedance is not matched, the traditional droop control is difficult to distribute the reactive power reasonably according to the droop mode of reactive power and voltage. Therefore, an improved droop control based on line identification is proposed to eliminate the bias of reactive power allocation. Firstly, the influence of line parameters on traditional droop control is analyzed in detail. Secondly, the line observation link based on local signal is constructed for a single distributed power source. In order to accurately identify the equivalent line impedance of the distributed power supply, a voltage compensation term is added to the traditional sag control based on the line identification results, so that it can still maintain the rational allocation of reactive power when the equivalent line impedance mismatches. Finally, the proposed improved droop control strategy is applied to a typical microgrid system, and the correctness and effectiveness of the proposed method are verified by MATLAB/Simulink simulation. The simulation results show that the proposed active line observer can accurately identify the actual value of the equivalent line impedance based on the local signal. Based on the line identification results, the proposed active line observer can effectively compensate the mismatch voltage drop of the DG equivalent connection line. The improved scheme does not need to rely on real-time communication system to exchange information between DG sources, nor does it need to use the central controller to send synchronous signals to keep the synchronization of the improved control start. The results show that the proposed improved droop control strategy is effective.
【作者單位】： 天津大學(xué)智能電網(wǎng)教育部重點實驗室;中華人民共和國科學(xué)技術(shù)部高技術(shù)研究發(fā)展中心;
【基金】：國家高技術(shù)研究發(fā)展計劃(863計劃)(2015AA050403) 國家自然科學(xué)基金(51377117;51307115)~~
【分類號】：TM727

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