基于PMU的三相电力系统不平衡检测
PMU based Detection of Imbalance in Three-Phase Power Systems
摘要：
研究了利用相量测量单元（PMU）进行三相电力系统不平衡检测的问题。提出了一种非标称频率下PMU测量的零、正、负序列的通用模型，并给出了一个假设检验框架。新的公式考虑到了这样一个事实，即系统中轻微程度的不平衡是可以接受的，并不表明随后的中断，故障或物理组件的退化。一个广义的似然比检验（GLRT）的开发和示出的负序相量估计和标称系统操作的不平衡的可接受的水平的函数。作为一个副产品，所提出的检测方法，正，负相量和频率偏差的约束估计得到平衡和不平衡的情况。理论和数值性能分析表明，改进的性能超过基准技术和鲁棒性的存在下，额外的谐波。
英文摘要：
The problem of imbalance detection in a three-phase power system using a phasor measurement unit (PMU) is considered. A general model for the zero, positive, and negative sequences from a PMU measurement at off-nominal frequencies is presented and a hypothesis testing framework is formulated. The new formulation takes into account the fact that minor degree of imbalance in the system is acceptable and does not indicate subsequent interruptions, failures, or degradation of physical components. A generalized likelihood ratio test (GLRT) is developed and shown to be a function of the negative-sequence phasor estimator and the acceptable level of imbalances for nominal system operations. As a by-product to the proposed detection method, a constrained estimation of the positive and negative phasors and the frequency deviation is obtained for both balanced and unbalanced situations. The theoretical and numerical performance analyses show improved performance over benchmark techniques and robustness to the presence of additional harmonics.
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