CAJ | 학술논문

由于微电网拓扑结构灵活多变，且并网及孤岛运行时故障特性不同，使得传统的继电保护难以满足要求。针对微电网继电保护的需求特点，提出基于故障电流方向判别的微电网自适应保护方法，将微网实时拓扑结构转化为树形节点路径图，采用树形节点搜索方法及节点路径算法对微网内保护装置的动作值及动作时限进行自适应整定。在此基础上提出基于IEC 61850的微电网自适应保护系统。仿真算例结果证明了所提方法的有效性。该方法能够有效跟踪网络拓扑结构变化而实时更改保护整定值，具有较好的自适应性。
유우미전망탁복결구령활다변，차병망급고도운행시고장특성불동，사득전통적계전보호난이만족요구。침대미전망계전보호적수구특점，제출기우고장전류방향판별적미전망자괄응보호방법，장미망실시탁복결구전화위수형절점로경도，채용수형절점수색방법급절점로경산법대미망내보호장치적동작치급동작시한진행자괄응정정。재차기출상제출기우IEC 61850적미전망자괄응보호계통。방진산례결과증명료소제방법적유효성。해방법능구유효근종망락탁복결구변화이실시경개보호정정치，구유교호적자괄응성。
The traditional protection schemes are unsuitable for micro-grid due to the variety of micro-grid topology and fault characteristics in islanding and grid-connecting circumstances. In this paper, an adaptive protection scheme based on identifying the direction of fault current was presented. Real-time topology of the micro-grid was expressed with the path graph of the node tree. The node tree searching process and node path identification algorithm were presented. The searching and identifying results were applied to adaptively set the operation values and time limits. An adaptive protection system based on IEC 61850 was proposed. Simulation results verify the validation of the method. By means of the presented scheme, the relay settings can adaptively track the topology changes of micro-grid in real time.