The virtual synchronous generator (VSG) improves the robustness of the inverter-interfaced distributed generator (IIDG) against instability by introducing a virtual inertia. However, the transient response of the active power and the angular frequency conflict with each other for the IIDG with fixed inertia control. It is necessary to adopt adaptive control to improve overall performances of power and frequency as the operating condition changes. This paper analyzes the impact of the inertia on power and angular frequency. A dual-adaptivity inertia control strategy is proposed to offer a responsive and stable frequency support and also achieve the balance between power regulation and frequency regulation according to different operating conditions. The principle of parameter design is given to obtain the range of adaptivity. Quantitative assessment considering the cumulative effect of the output deviation and its duration is also presented to evaluate the proposed strategy intuitively. The strategy is further verified based on PSCAD/EMTDC and a hardware-in-loop experiment platform based on RTDS. Results confirm that the proposed strategy not only achieves rapid frequency response with slight dynamic deviations under disturbances but also strikes a balance between the frequency and power and leads to improved overall control.
Bibliographical noteFunding Information:
Manuscript received January 10, 2019; revised April 22, 2019 and July 1, 2019; accepted August 10, 2019. Date of publication August 14, 2019; date of current version January 7, 2020. Paper no. TPWRS-00050-2019. This work was supported in part by Shanghai Sailing Program under Grant 17YF1410200, in part by National Natural Science Foundation of China under Grant 51807117, in part by Major Scientific Research and Innovation Projects of Shanghai Education Commission under Grant 2019-01-07-00-02-E00044. (Corresponding author: Meiyi Li.) W. Huang is with the Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China (e-mail: email@example.com).
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- Dual-adaptivity inertia control
- dynamic performance
- inverter interfaced distributed generator (IIDG)
- quantitative assessment
- virtual inertia
- virtual synchronous generator (VSG)