This paper planned a hybrid static synchronous compensator (hybrid-STATCOM) in a three-phase power transmission system that has a wide benefit range and low DC-link voltage. Because of these prominent quality, the system costs can be greatly reduced. In this paper, the circuit arrangement n of hybrid-STATCOM is received first.
Its V-I quality is then analyzed, discussed, and compared with traditional STATCOM and capacitive-coupled STATCOM (C-STATCOM). The system parameter design is then planned on the basis of application of the reactive power compensation range and prevention of the potential resonance problem. After that, a control strategy for hybrid-STATCOM is planned to allow operation under different voltage and current conditions
such as unbalanced current, voltage dip, and voltage fault. Finally, simulation and experimental results are provided to verify the wide compensation range and low DC-link voltage quality and the good dynamic work of the planned hybrid-STATCOM.
- Capacitive-coupled static synchronous compensator (C-STATCOM)
- Hybrid static synchronous compensator (hybrid-STATCOM)
- Static synchronous compensator (STATCOM)
- Wide compensation range
- Low DC-link voltage
Fig. 1. Circuit configuration of the hybrid-STATCOM.
EXPECTED SIMULATION RESULTS:
Fig. 2. Dynamic compensation waveforms of load voltage, source current, and load and source reactive powers by applying hybrid-STATCOM under different loadings cases.
Fig. 3 Dynamic compensation waveforms of vx and isx by applying hybrid-STATCOM under (a) inductive load, (b) capacitive load and (c) changing from capacitive load to inductive load.
Fig. 4. Dynamic compensation waveforms of vx and isx by applying hybrid-STATCOM under unbalanced loads.
Fig. 5. Dynamic compensation waveforms of vx and isx by applying hybrid-STATCOM under voltage fault condition.
Fig. 6. Dynamic compensation waveforms of vx and isx by applying hybrid-STATCOM during voltage dip.
In this paper, a hybrid-STATCOM in three-phase power system is planned and discussed as a cost-effective reactive power compensator for medium voltage level application. The system configuration and V-I quality of the hybrid-STATCOM are analyzed, discussed, and compared with traditional STATCOM and C-STATCOM.
In addition, its parameter design method is planned on the basis of application of the reactive power benefit range and prevention of a potential resonance problem. Moreover, the control strategy of the hybrid-STATCOM is developed under different voltage and current conditions.
Finally, the wide benefit range and low DC-link voltage quality with good dynamic work of the hybrid-STATCOM are proved by both simulation and experimental results.
 J. Dixon, L. Moran, J. Rodriguez, and R. Domke, “Reactive power compensation technologies: State-of-the-art review,” Proc. IEEE, vol. 93, no. 12, pp. 2144–2164, Dec. 2005.
 L. Gyugyi, R. A. Otto, and T. H. Putman, “Principles and applications of static thyristor-controlled shunt compensators,” IEEE Trans. Power App. Syst., vol. PAS-97, no. 5, pp. 1935–1945, Sep./Oct. 1978.
 T. J. Dionise, “Assessing the performance of a static var compensator for an electric arc furnace,” IEEE Trans. Ind. Appl., vol. 50, no. 3, pp. 1619–1629, Jun. 2014.a
 F. Z. Peng and J. S. Lai, “Generalized instantaneous reactive power theory for three-phase power systems,” IEEE Trans. Instrum. Meas., vol. 45, no. 1, pp. 293–297, Feb. 1996.
 L. K. Haw, M. S. Dahidah, and H. A. F. Almurib, “A new reactive current reference algorithm for the STATCOM system based on cascaded multilevel inverters,” IEEE Trans. Power Electron., vol. 30, no. 7, pp. 3577–3588, Jul. 2015.