本文選題：直流微電網(wǎng)　切入點(diǎn)：變換器并聯(lián)運(yùn)行　出處：《西南交通大學(xué)學(xué)報》2017年05期 　論文類型：期刊論文

【摘要】：為實(shí)現(xiàn)直流外電網(wǎng)系統(tǒng)的負(fù)載均流,提高系統(tǒng)穩(wěn)定性,在考慮線路阻抗的前提下,提出一種基于自適應(yīng)虛擬阻抗的下垂控制方法.該方法根據(jù)輸出下垂特性和虛擬阻抗原理,將負(fù)載電壓、電流等代入虛擬阻抗算法,對所得虛擬阻值進(jìn)行適當(dāng)修正,實(shí)現(xiàn)了虛擬阻抗的自適應(yīng)修正,能夠有效改善負(fù)載均流效果.在搭建的實(shí)驗(yàn)平臺上與傳統(tǒng)下垂控制、傳統(tǒng)虛擬阻抗下垂控制進(jìn)行實(shí)驗(yàn)測試與對比,結(jié)果表明:傳統(tǒng)虛擬阻抗下垂控制方式和自適應(yīng)虛擬阻抗下垂控制方式均能將負(fù)載電流差異抑制在0.04 A內(nèi),各并聯(lián)單元輸出電流差異小;自適應(yīng)虛擬阻抗下垂控制方式的負(fù)載調(diào)整率為0.1%,具有更低的負(fù)載調(diào)整率;綜合考慮輸出電流差異、負(fù)載調(diào)整率、母線電壓等因素,自適應(yīng)虛擬阻抗下垂控制方式具有良好的負(fù)載均流優(yōu)越性和系統(tǒng)穩(wěn)定性.
[Abstract]:In order to realize load current sharing and improve system stability, a droop control method based on adaptive virtual impedance is proposed, which is based on output droop characteristic and virtual impedance principle. The load voltage and current are substituted into the virtual impedance algorithm, and the virtual resistance value is modified appropriately. The adaptive correction of the virtual impedance is realized, which can effectively improve the load current sharing effect. The traditional virtual impedance droop control is tested and compared. The results show that both the traditional virtual impedance droop control mode and the adaptive virtual impedance droop control mode can restrain the load current difference within 0.04 A. The output current difference of each parallel unit is small, the load adjustment rate of adaptive virtual impedance droop control is 0.1, the load adjustment rate is lower, and the factors such as output current difference, load adjustment rate, bus voltage and so on are considered synthetically. Adaptive virtual impedance droop control has good load current sharing advantages and system stability.
【作者單位】： 西南交通大學(xué)電氣工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(61473238,51407146) 四川省杰出青年基金資助項(xiàng)目(2015JQ0016)
【分類號】：TM727

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