光伏參與抑制電力系統(tǒng)區(qū)間振蕩的無功控制策略研究
程青青，都洪基
（南京理工大學(xué) 自動(dòng)化學(xué)院，江蘇 南京 210094）
摘 要：針對(duì)大規(guī)模光伏并網(wǎng)對(duì)系統(tǒng)區(qū)間低頻振蕩可能產(chǎn)生的負(fù)面影響，研究了基于無功控制的光伏抑制系統(tǒng)區(qū)間振蕩的控制策略。建立光伏并網(wǎng)模型，采用向控制輸入點(diǎn)注入高斯偽隨機(jī)信號(hào)的方式辨識(shí)出系統(tǒng)的降階傳遞函數(shù)，根據(jù)留數(shù)指標(biāo)對(duì)反饋信號(hào)進(jìn)行選擇，選擇留數(shù)幅值最大的信號(hào)作為阻尼控制器的輸入信號(hào)，參考電力系統(tǒng)穩(wěn)定器的超前- 滯后結(jié)構(gòu)，采用留數(shù)法對(duì)阻尼控制器的各參數(shù)進(jìn)行整定。以四機(jī)兩區(qū)域系統(tǒng)為算例，搭建相應(yīng)的光伏并網(wǎng)模型，通過時(shí)域仿真表明：所提出的基于無功控制的光伏附加阻尼控制器對(duì)于系統(tǒng)區(qū)間振蕩具有較好的抑制效果。
關(guān)鍵詞：光伏并網(wǎng)；區(qū)間低頻振蕩；無功控制；光伏附加阻尼控制；留數(shù)
中圖分類號(hào)：TM615；TM712 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2019)04-0007-06
Reactive Power Control Strategy Research for Photovoltaic System to Suppress Interval Oscillation in Power System
CHENG Qing-qing, DU Hong-ji
（School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract: Aiming at possible negative impact of large-scale grid connected photovoltaic system on the low frequency oscillation of the system, this paper researched the control strategy of interval oscillation based on reactive power control for photovoltaic suppression system interval oscillation. The photovoltaic grid connected model was established, and the reduced order transfer function of the system was identified by injecting Gauss pseudo-random signal into the control input point. According to the residue index, the feedback signal was selected, and the residual signal of the maximum amplitude was chosen as the input signal of the damping controller. Referring to the lead lag structure of the power system stabilizer, the residue method was used to adjust the parameters of the damping controller. With the four machine two area system as an example, the corresponding photovoltaic grid connected model was built. The time domain simulation shows that the proposed photovoltaic additional damping controller based on reactive power control has a better suppression effect on the system interval oscillation.
Key words: photovoltaic grid-connected; interval low frequency oscillation; reactive power control; photovoltaic additional damping control; residue
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