微電網(wǎng)自適應(yīng)電流保護(hù)原理完善及其新算法研究
發(fā)布時(shí)間：2019-08-13 11:03
【摘要】：微電網(wǎng)由于其運(yùn)行模式及網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)多變等與傳統(tǒng)電網(wǎng)的特征差異,需要提供適應(yīng)其特性的新的保護(hù)原理。自適應(yīng)保護(hù)的實(shí)時(shí)性等特點(diǎn)與該問題恰好契合。首先分析了原有自適應(yīng)電流保護(hù)原理在應(yīng)用于故障時(shí)可能在同一線路出現(xiàn)雙向短路電流的微電網(wǎng)中時(shí)容易出現(xiàn)的錯(cuò)誤,并對此進(jìn)行了原理完善。其次嘗試新的自適應(yīng)電流保護(hù)算法,用三阻抗圓交點(diǎn)的方法計(jì)算出等效阻抗這一關(guān)鍵參數(shù),再加入自適應(yīng)突變量算法,以規(guī)避原有算法易受擾動(dòng)而導(dǎo)致動(dòng)作錯(cuò)誤的問題。而后采用PSCAD對典型微電網(wǎng)進(jìn)行建模仿真,算例結(jié)果驗(yàn)證了該保護(hù)能糾正原有原理在特定情況下出現(xiàn)的錯(cuò)誤,比原算法更好的穩(wěn)定性與準(zhǔn)確性。
[Abstract]:Because of the difference between microgrid and traditional power grid in its operation mode and network topology, it is necessary to provide a new protection principle to adapt to its characteristics. The real-time characteristics of adaptive protection coincide with this problem. Firstly, the errors of the original adaptive current protection principle in the microgrid with two-way short-circuit current in the same line are analyzed, and the principle is improved. Secondly, a new adaptive current protection algorithm is tried, the key parameter of equivalent impedance is calculated by the method of three impedance circular intersection, and then the adaptive burst algorithm is added to avoid the problem of action error caused by the disturbance of the original algorithm. Then PSCAD is used to model and simulate the typical microgrid. The results of an example show that the protection can correct the errors of the original principle under specific conditions and has better stability and accuracy than the original algorithm.
【作者單位】： 河海大學(xué)能源與電氣學(xué)院;三峽大學(xué)電氣與新能源學(xué)院;國家電網(wǎng)湖北省電力公司鄂州供電公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(51477090)~~
【分類號(hào)】：TM727;TM773
[Abstract]:Because of the difference between microgrid and traditional power grid in its operation mode and network topology, it is necessary to provide a new protection principle to adapt to its characteristics. The real-time characteristics of adaptive protection coincide with this problem. Firstly, the errors of the original adaptive current protection principle in the microgrid with two-way short-circuit current in the same line are analyzed, and the principle is improved. Secondly, a new adaptive current protection algorithm is tried, the key parameter of equivalent impedance is calculated by the method of three impedance circular intersection, and then the adaptive burst algorithm is added to avoid the problem of action error caused by the disturbance of the original algorithm. Then PSCAD is used to model and simulate the typical microgrid. The results of an example show that the protection can correct the errors of the original principle under specific conditions and has better stability and accuracy than the original algorithm.
【作者單位】： 河海大學(xué)能源與電氣學(xué)院;三峽大學(xué)電氣與新能源學(xué)院;國家電網(wǎng)湖北省電力公司鄂州供電公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(51477090)~~
【分類號(hào)】：TM727;TM773
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