Dynamic Reactive Power Compensation Device Characteristic Evaluation And Power Quality Monitoring System Development

In the national standards for power quality requirements, problems that can cause thephenomena such as: voltage fluctuations, flicker, voltage and current frequency deviation,harmonic, phase unbalance are power quality problems. Volatility and indirect of windpower directly result power quality problems of wind farms at the run time.According to wind power reactive shortage situation and reactive power compensationtechnology development trends, for the needs of reasonable choice applicable performanceof the reactive power compensation device, this paper proposed and developed a dynamicreactive power compensation device evaluation system and power quality monitoring systembased on virtual instrument technology. System architecture order signal conditioningcircuits as hardware-based, PXI data acquisition platform as the core, LabVIEW software asdevelopment tools. The power signal processing though hardware signal conditioning circuitand then collected by PXI data acquisition platform into the PC, Using the data thatLabVIEW software wrote analysis and process program, establishment power qualitymonitoring system and dynamic reactive power compensation device response time testsystem, achieve real-time monitor and analysis the key operating parameters of powerquality, to prevent power system failure and accidents caused by power quality.System order detect for the purpose, national standards as the basis, reactive powercompensation and power quality parameters tested as the core, data analysis and datamanagement to extended, the virtual instrument technology featured, Integration with manycore functions such as: online testing, waveform display, data acquisition, signal processingand analysis, exceeded the warning, data management and so on, to achieve a full elementsof reactive power compensation and power quality monitoring integration. The data ofsystem monitored and displayed including: appropriate time, reactive power, active power,power factor, voltage and current waveforms, the power supply frequency, the voltagedeviation, the harmonic voltage/current amplitude, phase, etc.; real-time calculation datacomprises three-phase voltage, current deviation percentage, the frequency deviation of the power supply percentage, each harmonic content rate, harmonic voltage distortion rate, totalharmonic distortion rate, etc.; Alarming including voltage, current frequency deviation alarmstandard, three-phase voltage unbalance alarm, The total harmonic distortion alarm, etc.; thedata of real-time analysis, including steady-state signal waveform phase diagram, the chartof basic parameters diagram, the signal sequence component vector diagram, etc., field trialsto prove the system could achieve good test result.