بازیاب پویا ولتاژ (DVR) بر پایه SMES برای جبران نوسان های ولتاژ

ABSTRACT SMES Based Dynamic Voltage Restorer for Voltage Fluctuations Compensation

SUPERCONDUCTING MAGNETIC ENERGY STORAGE (SMES), characterized by its highly efficient energy storage, quick response, and power controllability, is expected to contribute to high-quality power of the power systems. The researches on SMES for power quality improvement mainly have two methods. One is utilizing SMES as an uninterruptible power supply (UPS) to protect sensitive loads [1], [2]. The SMES-UPS needs to compensate full power for the load, which requires large capacity converters and energy storage units. The other method is connecting SMES in parallel with the system and compensates system voltage fluctuation [3]. The parallel compensation method controls the system voltage indirectly through regulating the injecting current of SMES. The compensation capability is influenced by the system short circuit capacity and the location of SMES.

For the dynamic voltage fluctuation compensation, the dynamic voltage restorer (DVR) which uses a series-connected topology is a more cost-effective solution. The basic operating principle of a DVR is to insert a voltage of required magnitude and phase in series with a distribution feeder to maintain the desired amplitude and waveform for the load voltage. Moreover, the compensation capability is sensitive to the load level, and is independent of the system short circuit capacity and the installation position. To improve the compensation capability of DVR, such as the large amplitude or long duration voltage fluctuation, the energy storage unit is essential to supply the power transfer during the voltage compensation [4]. In this paper, a superconducting magnet is introduced as the energy storage unit of the DVR. Firstly, the operation principle of the SMES based DVR is analysed. Secondly, the voltage compensation control method is designed. Then, the dynamic response of the SMES based DVR is evaluated using MATLAB simulation.