微电网自适应电流保护原理完善及其新算法研究
发布时间：2019-08-13 11:03
【摘要】：微电网由于其运行模式及网络拓扑结构多变等与传统电网的特征差异,需要提供适应其特性的新的保护原理。自适应保护的实时性等特点与该问题恰好契合。首先分析了原有自适应电流保护原理在应用于故障时可能在同一线路出现双向短路电流的微电网中时容易出现的错误,并对此进行了原理完善。其次尝试新的自适应电流保护算法,用三阻抗圆交点的方法计算出等效阻抗这一关键参数,再加入自适应突变量算法,以规避原有算法易受扰动而导致动作错误的问题。而后采用PSCAD对典型微电网进行建模仿真,算例结果验证了该保护能纠正原有原理在特定情况下出现的错误,比原算法更好的稳定性与准确性。
[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.
【作者单位】： 河海大学能源与电气学院;三峡大学电气与新能源学院;国家电网湖北省电力公司鄂州供电公司;
【基金】：国家自然科学基金项目(51477090)~~
【分类号】：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.
【作者单位】： 河海大学能源与电气学院;三峡大学电气与新能源学院;国家电网湖北省电力公司鄂州供电公司;
【基金】：国家自然科学基金项目(51477090)~~
【分类号】：TM727;TM773
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