PMU Optimal Configurtion And Power System Fault Diagnosis

As the traditional power grid monitoring and management system, SCADA/EMS no longer meet the increasingly complex requirements of the power system. Wide area measurement system (WAMS) based on unified collection information will bring new vitality to the traditional monitoring and management system. As a key device in WAMS, phase measurement unit(PMU) is expensive. In addition, it is impossible to install PMU on each bus node in the grid in a pilot run phase. So PMU optimal allocation scheme is necessary to meet the dynamic monitoring in the whole network, and also to meet the requirements of economy in the transition phase.In this Thesis, firstly, we set up a basic configuration model of PMU, based on the target of the whole power grid completely observable. On the basis of the above, we proposes a new unified PMU placement optimization algorithm based on 0-1 integer Programming, respectively processing system under different operation modes. Also four special models are derived to achieve the full observability of Power grid:in normal condition regardless of zero-inject buses, regard of zero-inject buses, any line tripped or any PMU malfunctions. On the basis of the above, we proposes a new unified PMU placement algorithm considering the actual situation of power grid multi-objective method of multiple factors. With the Improvement of the basic model, the improved model can obtain more than one feasible solution. Due to the actual economic, we proposes of PMU segments installed configuration. Considering different conditions, such as the actual geography comprehensive factor, we can join weight ratio.Another one of this Thesis, we solve the main problem is the power system fault diagnosis based PMU. Basing on the information of the switch and protection, can precisely judge the fault part and the fault property. When a multiplicity of power failures occur, the protection system will often appear mis-operation. The fault element is not easy to identify, even chain effects of the accident will happen. Through the synchronous phase information of PMU, we can quickly judge the correct circuit breaker and relay protection and automatic safety device occurs mis-operation or refuse to move. When the transmission line failure, it’s hard to determine the location of the point of failure. In this Thesis a new distributed parameter model which fits for line part and a new fault location method which makes use of the positive-order component of the two terminals voltages and currents of the line are proposed. And a distribution program of PMU which can ensure the data of two terminals of any line are synchronous is given a detailed account. At the same time, through the PMU the voltage and current of two terminals in normal state are measured. Then the line parameters are modified and the precision of fault location is promoted. The matlab simulation software respectively simulates two different conditions: there are PMU devices at any terminal of the line and there is only one PMU device at one terminal of the line. A lot of matlab simulation results indicate that the fault location accuracy of this method is higher than the accuracy of the fault component methods which are in general use.