A Practical Secondary Frequency Control Strategy for Virtual Synchronous Generator

Jiang, Kun; Su, Hongsheng; Lin, Hongjian; He, Kaizhong; Zeng, Hanghang; Che, Yulong

doi:10.1109/tsg.2020.2974163

Cited by 52 publications

(21 citation statements)

References 6 publications

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“…Even the grid is strong enough that a large virtual inertia support is not needed for VVSG operating in the grid-connected mode, but the first-order low-pass filter of output active power still performs the same time-delay effect. In order to filter out power pulsations induced by grid harmonics or nonlinear loads, the filter cutoff frequency is generally set to two to five times the fundamental frequency in tenths, hence the response speed of the output active power is reduced [25,26]. Setting J ω = 1, and increasing T f gradually, the zero and poles trend of G r (s) is shown in Figure 4.…”

Section: Primary Frequency Regulationmentioning

confidence: 99%

Research on Direct Power Control Strategy Based on Voltage Controlled Virtual Synchronous Generator

Mao³

et al. 2021

Electronics

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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.

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Section: Primary Frequency Regulationmentioning

confidence: 99%

Research on Direct Power Control Strategy Based on Voltage Controlled Virtual Synchronous Generator

Mao³

et al. 2021

Electronics

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show abstract

“…However, the aforementioned controllers [20–26] are not capable to provide secondary frequency regulation, which is a necessary feature in the weak grid scenario. Therefore, a secondary frequency controller is presented in [28, 29] to deal with a VSG. These secondary frequency controllers [28, 29] are implemented thorough a PI regulator, which makes system sluggish and required rigorous tuning.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a secondary frequency controller is presented in [28, 29] to deal with a VSG. These secondary frequency controllers [28, 29] are implemented thorough a PI regulator, which makes system sluggish and required rigorous tuning. However, the experimental performance is not analysed for [28, 29] to validate the practical implementation of power converter applications.…”

Section: Introductionmentioning

confidence: 99%

“…These secondary frequency controllers [28, 29] are implemented thorough a PI regulator, which makes system sluggish and required rigorous tuning. However, the experimental performance is not analysed for [28, 29] to validate the practical implementation of power converter applications. Table 1 shows the comparative analysis with distinct merits and demerits of the state‐of‐art techniques [18–28].…”

Section: Introductionmentioning

confidence: 99%

“…However, the experimental performance is not analysed for [28, 29] to validate the practical implementation of power converter applications. Table 1 shows the comparative analysis with distinct merits and demerits of the state‐of‐art techniques [18–28].…”

Section: Introductionmentioning

confidence: 99%

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A Practical Secondary Frequency Control Strategy for Virtual Synchronous Generator

Cited by 52 publications

References 6 publications

Research on Direct Power Control Strategy Based on Voltage Controlled Virtual Synchronous Generator

Research on Direct Power Control Strategy Based on Voltage Controlled Virtual Synchronous Generator

Self‐synchronising virtual induction generator without phase‐locked loop and proportional–integral regulators

Implementation of the Virtual Synchronous Machine in Grid-Connected and Stand-alone Mode

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