Measures to Improve Power Quality in Distribution System e7d195523061f1c021b92b3d25e54ab5e788c0576048880950C3AFFA1066A7153250F1349197BA8C5246BA9D557EC0274B8DA272D2431748978789E76D2CD7D1F11E7447C1D163F5D9CA1CD35DC7B6F0026C6BB43698AE8A1A50A3B34DA472CDA8898A116D2621F720577CEB1EC5AE786B3A577EC3E762EF9351D5FE95BB5FD00056FCA016A5904C Measures to Improve Power Quality in Distribution System FUYAO NI Department of Electrical Engineering and Computer Science The University of Wisconsin-Milwaukee, Milwaukee, WI 53201

BACKGROUND Problem Complexity: Widespread use of electronic equipment comes up with new disturbance and harmonics issues and changes the power system nature. Immunity decline: The electronic devices such as digital control and power electronic are highly sensitive to the disturbance. Technology improvement: The best solution to power quality is use the some custom power devices based on power electronics technology.

CUSTOMER POWER DEVICE DVR (dynamic voltage restorer): Series compensator to mitigate the power quality problems in terminal voltage

CUSTOMER POWER DEVICE 2. DSTATCOM (distribution static compensators): Shunt compensators to solve the current-based power quality problems in distribution system.

CUSTOMER POWER DEVICE 3.UPQC(Unified Power Quality Compensators): A combination of shunt and series compensators for mitigating multiple PQ problems.

MANAGMENT DIFFERENT PQ LEVEL DIFFERENT CUSTOMER

MANAGMENT Other power quality management strategies are as follows: Improve Power Quality Management Systems Strengthen Power Grid Construction Planning Strengthen the Operation and Management Strengthen the Cause of Contaminated Power Quality Control Efforts

MANAGMENT Other power quality management strategies are as follows: Improve Power Quality Management Systems Strengthen Power Grid Construction Planning Strengthen the Operation and Management Strengthen the Cause of Contaminated Power Quality Control Efforts

FUTURE TREND Monitor Build a web-based measurement system with smart sensors, monitor PQ parameters from multi measuring points in real-time and perform the real time analyses of signals. easy-to-use software enables customer report PQ data at their own measurement points. Renewable power The output of renewable energy generations is unsteady with fluctuation. Superconducting magnetic energy storage (SMES) can reduce fluctuations of renewable energy sources in power network. Use active filters or the development of inverters, which will not generate significant interference, can solve the problem caused by inverters. However technical methods are expensive now, meanwhile there is currently no appropriate legislation relating to the power of renewable energy sources connected to the medium voltage grid.

CONCLUSION Summarizes the reasons of the increasing importance of power quality. The impact and the immunity of electronic devices make the problem complicated. With the development of electronic equipment, various power quality enhancement devices are present in distribution system. The customer power devices such as DSTATCOM, DVR and UPQC has been reviewed. Meanwhile develop technology and systems to meet different levels of consumer PQ can be one of the best management strategies in the future. The expansion of distribution generation and a large-scale of renewable energy generation have the potential to change the power quality issue. In the future, there will be more and more power electronic devices interfacing the grid and distributed sources. We also need more advanced monitoring system by use of AI and big data technology. However, the establishment of more rules and limitation is urgent and significant.

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