Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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多逆變器并聯(lián)的微電網(wǎng)無功均分控制策略研究

來源:電工電氣發(fā)布時間:2023-03-04 11:04 瀏覽次數(shù):365

多逆變器并聯(lián)的微電網(wǎng)無功均分控制策略研究

宋帥超,秦斌
(湖南工業(yè)大學(xué) 電氣與信息工程學(xué)院,湖南 株洲 412007)
 
    摘 要:針對在多逆變器并聯(lián)的孤島微電網(wǎng)系統(tǒng)中,各線路之間的阻抗不一致,無功功率不能按需分配以及逆變器之間出現(xiàn)環(huán)流等問題,提出了虛擬阻抗策略,采用 PR 控制代替?zhèn)鹘y(tǒng)的 PI 控制,提高系統(tǒng)的穩(wěn)定性,減小環(huán)流對系統(tǒng)的影響,并在虛擬阻抗策略中引入自適應(yīng)控制,使虛擬阻抗根據(jù)系統(tǒng)的無功功率和母線電壓自適應(yīng)調(diào)節(jié),從而提高電能質(zhì)量,仿真實驗驗證了該策略的有效性。
    關(guān)鍵詞: 孤島微電網(wǎng);下垂控制;虛擬阻抗;PR 控制;自適應(yīng)控制
    中圖分類號:TM464 ;TM712     文獻標(biāo)識碼:A     文章編號:1007-3175(2023)02-0023-06
 
Research on Reactive Power Sharing Control Strategy of
Microgrid with Multi-Parallel Inverters
 
SONG Shuai-chao, QIN Bin
(College of Electrical & Information Engineering, Hunan University of Technology, Zhuzhou 412007, China)
 
    Abstract: As the impedance of each line is different in the islanded microgrid system of multi-parallel inverters, the powerless power cannot be distributed according to need and the circulating current appears between different inverters. Therefore, the virtual impedance strategy is proposed in the paper. The traditional PI control is replaced with the PR control to increase system stability and decrease the effects of circulating current on the system. The adaptive control is introduced into the virtual impedance strategy to make virtual impedance regulate adaptively according to powerless power and bus voltage of the system, which raises the power quality. Finally, the simulation experiment verifies the validity of this strategy.
    Key words: islanded microgrid; droop control; virtual impedance; PR control; adaptive control
 
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