On-line relay protection setting system for mine power grid considering multi-scenario operation mode
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摘要: 现有的矿山电网继电保护整定研究虽然考虑了不同运行方式下矿山电网继电保护的整定方法,但均未考虑与矿山供电调度自动化系统结合进行整定,不能随矿山电网的运行方式变化实时进行定值校核并对其中性能不满足要求的保护给出符合要求的新定值。针对上述问题,通过定义保护位置所在出线的母线电源侧某一类断路器状态的组合为矿山供电系统的场景,设计了一种考虑多场景运行方式的矿山电网继电保护在线整定系统。该系统利用场景对应的开关状态矩阵计算得到矿山供电系统场景区域矩阵和场景网络支路阻抗矩阵,基于场景区域矩阵和场景网络支路阻抗矩阵计算出此类场景下的场景最大和最小系统阻抗。当系统监测到断路器开关状态变化时,即场景发生变化时,自动读取断路器实时开关状态,通过场景开关信息矩阵找出存在状态改变的开关的场景类,并按照场景类中开关的数量顺序选择一个场景类,对场景类对应的一组保护进行定值校核。根据定值校核计算结果,判断保护性能是否满足要求,若不满足要求,则对不满足要求的保护进行在线整定计算;若满足要求,则该场景类校核结束,重新选择下一场景类,直至全部场景类都计算完毕。实例应用结果表明,通过与矿山供电调度自动化系统通信,考虑多场景运行方式的矿山电网继电保护在线整定系统计算出的整定值保护范围能够适应各种运行方式中继电保护装置的要求,避免了运行方式改变后定值不符合要求造成的继电保护装置的拒动和误动。Abstract: Although the existing research on mine power grid relay protection setting has studied the setting methods of mine power grid relay protection under different operation modes, but it has not studied the setting method that applied in the automation system of mine power supply and dispatching. Therefore, the setting value could not be calculated in real time as the operation mode of the mine power grid changes. The new setting value can not be given to the protection that does not meet the requirements. To address the above problems, on-line relay protection setting system for mine power grid considering multi-scenario operation mode is proposed by defining the combination of a certain type of circuit breaker status on the bus power side of the outgoing line of the protection position as a mine power supply system scenario. The system uses the scenario corresponding switch state matrix to calculate the scenario area matrix and scenario network branch impedance matrix of the mine power supply system. Then the system calculates the maximum and minimum system impedance of the scenario based on the scenario area matrix and scenario network branch impedance matrix. As the change of breaker switching state or the scenario is monitored, the real-time switching state of the breaker is automatically read. The scenario class with the state change switch is found through the scenario switch information matrix. A scenario class is selected according to the number of switches in the scenario class, and the setting value of protection corresponding to the scenario class is calculated. Based on the calculation result of the setting value, it is reviewed whether the protection performance meets the requirements.If not meeting the requirements, on-line setting calculation will be carried out. If meeting the requirements, then the calculation of the scenario class will be completed, and the next scenario class will be calculated until the all scenario classes being calculated.The application results show that by communicating with the mine power supply dispatching automation system, the protection range of the on-line relay protection setting system for mine power grid considering multi-scenario operation mode can adapt to the requirements of relay protection devices in various operation modes. Moreover, the method avoids the rejection and misoperation of relay protection devices caused by the setting value not meeting the requirements after the change of operation mode.
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