Research On Phasor Measurement System Of Area Bus Voltage

With the acceleration of the interconnection of the power network and the expansion of the system, the stability monitoring and controlling are becoming more and more important in power system. Phasor, one of the basic parameters, can reflect the state of static stability, so it is an important criterion for stability. The fact that real-time and accurate phasor information have a great influence on controlling power system stability.In this paper, synchronization clock is established by GPS, which markes a precise time label at the voltage zero-crossing point for the system bus voltage, and then time label is uploaded to central computer through the communication system, to calculate the system bus voltage phasor.In the first place, the bus voltage phasor measurement algorithm is researched, the asynchronous zero-crossing phasor measurement method is used, which can overcome the deficiency of circuit complexity and poor real-time in the past. Secondly, phasor measurement system of area bus voltage is designed, real-time clock is established by the counter of SMC AT89C52 and GPS, which provids serial communication interface and the second pulse signal to establish real-time clock in the entire system, thereby phasor information has the same time reference for the measured bus voltage. Once again, reasonable mean of communication is selected for the all system, the serial communication of between lower computer and sub-station host computer is achieved. On the basis of this study, the application software interface and function of the phasor measurement system of area bus voltage is designed.At last, the test data is analyzed. The analysis shows that the designe of phasor measurement system of area bus voltage is feasible and correctness.