Research On Synchronous Phasor Measurement Unit In Electric Power System

With the electric generator larger capability and power grid faster connection, power system structures is becoming more and more complex. The safety capacity of power grid is challenged. Therefore, Power grid stability-monitoring is becoming more and more important. Bus-bar voltage phasor is a major status variable for power grid stability status, which provide a strongly evidence for power grid stability control and dispatching centre. Hence, it is very important to synchronous measure the bus-bar voltage phasor for stability control of power grid.At first, the thesis introduces the background and significance of synchronous phasor measurement unit base on GPS technology. A new method, it is called "improved DFT", is provided by analyzing and researching synchronous phasor algorithm.Synchronous phasor measurement unit is designed base on this algorithm. The unit we designed contains two parts, collecting unit and clock unit High speed collect and communication is necessary for synchronous phasor measurement unit, so we design Double CPU structure for this unit. One chip is Renesas M16C62P, the other is TI TMS320LF2407. Ethernet is used for high-speed communication. The GPS signal is made as synchronous clock of synchronous phasor measurement unit which needed synchronous sampling. The hardware and software design is descriptive base on OEM panel. Model unit is used for hardware system design. It includes five units: collect unit, switch input and output unit, HMI unit, communication unit and power unit. Embedded system uCOS-â…¡is used in software designed. Software transplant, task assign, communication task and data collected task are declared expatiated.At last, data collected test, communication test and EMC test are designed for synchronous phasor measurement unit mainly performance. The test result is very good by analyzing and comparing with expected data.The mainly hardware design and software program of synchronous phasor measurement unit are completed in the thesis. Synchronous phasor measurement and communication parts are completed and pass the related tests. As a result, the unit structure is designed reasonably. The unit can satisfy with technology target of high precision and high speed communication.