【摘要】 目前,在配电网采用的三相四线制中,针对三相不对称负荷运行导致零序电流长期偏高,造成变压器损耗并影响变压器的寿命,且现有全容性无功补偿装置易造成严重过补偿危害,本文提出了一套零序电流治理的全容性无功补偿优化算法及装置。主要通过实时计算三相负荷所需无功补偿量,利用优化算法以全电容方式对相间与相对地间电容器组进行动态投切,进而通过有功转移及无功补偿方式实施零序电流的抑制。挂网运行结果表明,该装置能有效防止严重过补偿危害,并能有效抑制零序电流的增长,提高功率因数以及降低配电变压器损耗;同时采用先进的GPRS无线通信和监控软件实时互动,为负荷的状态调整提供了参考信息,达到了节能减排的效果。更多还原

【Abstract】 At present,as the operation of three-phase unbalanced load leads to the long-time higher of zero-sequence current in the three-phase four-wire distribution network,resulting in a short life and losses of transformer,and the existing full capacitive reactive power compensation devices are easy to cause serious overcompensation.Then this paper presents governance optimization method and device of zero-sequence current in distribution transformer,which obtains the required reactive power compensation of the three-phase unbalanced load by real-time calculation and then switches the capacitor of phase to phase and phase to ground dynamically,and then achieve the suppression effect of the zero-sequence current through the transfer of active power and the compensation of reactive power.After system linked on the network,the result shows that under the premise of preventing serious over-compensation,it can effectively inhibit the growth of zero-sequence current,improve the power factor and reduce the losses of distribution transformer;With the using of advanced GPRS wireless communication and monitoring software,the system can offer the staffs with reference information and achieved the effect of energy conservation and emissions reduction.更多还原