PMU configuration in the actual process, due to economic factors, cannot configurate a sufficient number of PMUs to make the system completely observable; this paper studies an optimal PMU placement based on incomplete observation for the given number of PMUs in a grid. After getting configurations, if the solution is not unique, then the system probabilistic reliability index is used as a reference factor to determine the largest value of the probabilistic reliability PMU incremental optimization program, and the CLMCS flow calculation method is used to verify the correctness of selected programs and gives the results of various programs and the number of iterations.
KEYWORDSincomplete observed, optimal placement, PMU, probabilistic reliability, self-consolidating concrete
INTRODUCTIONAt present, the electrical power system is mostly established in the data acquisition and supervisory system (SCADA); in this system, measurements and data acquisition cycles are long. You cannot measure the real-time data in the power grid, and the data are not time-stamp, so that different locations cannot obtain the same time point information. However, based on the global positioning system (GPS, Global Positioning System), phasor measurement unit (PMU, Phasor Measurement Unit) emergence can resolve the data synchronization issues. The PMU uses GPS for the time signal to carry on the time-stamp for the data measured by each node in the electrical power system. It is because of this characteristic that makes the power system dynamic observation possible. The PMU device has high measurement accuracy, high speed, and the advantage of a short time interval of read data. It is precisely because of these advantages that it will be widely studied as soon as this device appears. Its biggest characteristic is that it uses a time-stamp function that can obtain the phase angle of the node. 1,2 Due to the PMU real-time characteristic and that it can directly measure the voltage phase angle value of the benefits, in the power system, the installation of PMU devices can not only monitor data of grid nodes in real time but also render the power flow calculation in the power system convenient. If in the power system, all nodes are installed a PMU device, then each node in the power system voltage phasor and current phasor can be measured directly and has very high precision, and the whole power system is called complete observation. However, the PMU is more expensive and cannot be installed in every node in the power grid. Moreover, since the PMU is relatively expensive and is unable to install PMU for each node in the power grid, in the electrical power system, the installation part of the PMU becomes a widely researched topic in the power industry.With the rapid development of our economy and the continuous reform of electricity market, the continuous expansion of grids has become the development trend of the whole power system. It is due to the continuous expansion of this size that makes grid accidents have an annually increasing trend in ...
