Research on Direct Power Control Strategy Based on Voltage Controlled Virtual Synchronous Generator
| Autor: | Mao Fubin, Haizhen Xu, Taotao Hu, Qinglong Wang, Changzhou Yu, Zelin Wu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
TK7800-8360
Computer Networks and Communications Computer science virtual synchronous generator AC power Grid direct power control DC-BUS Power (physics) Electricity generation Hardware and Architecture Control and Systems Engineering Control theory virtual inertia Signal Processing power fast following voltage/current dual-mode switching Voltage source Electrical and Electronic Engineering Electronics Power control Voltage |
| Zdroj: | Electronics, Vol 10, Iss 2415, p 2415 (2021) Electronics Volume 10 Issue 19 |
| ISSN: | 2079-9292 |
| Popis: | To support the “carbon peak and carbon neutrality” goal, new energy is poised to explode, and new energy power generation converter is simultaneously facing new challenges. The conventional current-controlled new energy converter can quickly transmit active power on the DC bus to the power grid. However, for the weak grid, the stability margin of the converter grid-connected system is reduced on the one hand, which can easily cause resonance oscillation on the other hand, the current controlled converter cannot actively respond to system frequency and voltage fluctuation to offer support. The voltage controlled virtual synchronous generator (VVSG) is used to improve system small signal stability and frequency stability however, its power response speed is too slow to meet the requirements of fast following power command. Although a voltage/current dual-mode switching control scheme is put forward to achieve characteristics complementary of current controlled converter and voltage-controlled converter, the control structure switching and intermediate variable following is required to realize mode switching, which is prone to large power shocks and switching failures. In view of the problem, a direct power control strategy based on VVSG is proposed. The control structure is raised based on a conventional VVSG outer active power control loop, and the output active power and frequency characteristics are analyzed. Compared with the voltage and current dual-mode control, VVSG with direct power control can perform large inertia characteristic in the weak grid and fast power following characteristics in the strong grid by adjusting λ, and without control structure switching and intermediate variable following. Moreover, the two characteristics can be smoothly transited. In addition, the active support ability of voltage source can be maintained under both characteristics. Finally, the effectiveness of the proposed control strategy is verified through simulation results. |
| Databáze: | OpenAIRE |
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