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Abstract
High-penetration wind power will count towards a significant portion of future power grid. This significant role requires wind turbine generators (WTGs) to contribute to voltage and reactive power support. The maximum reactive power capacity (MRPC) of a WTG depends on its current input wind speed, so that the reactive power regulating ability of the WTG itself and adjacent WTGs are not necessarily identical due to the variable wind speed and the wake effect. This paper proposes an adaptive gains control scheme (AGCS) for a permanent magnet synchronous generator (PMSG)-based wind power plant (WPP) to provide a voltage regulation service that can enhance the voltage-support capability under load disturbance and various wind conditions. The droop gains of the voltage controller for PMSGs are spatially and temporally dependent variables and adjusted adaptively depending on the MRPC which are a function of the current variable wind speed. Thus, WTGs with lower input wind speed can provide greater reactive power capability. The proposed AGCS is demonstrated by using a PSCAD/EMTDC simulator. It can be concluded that, compared with the conventional fixed-gains control scheme (FGCS), the proposed method can effectively improve the voltage-support capacity while ensuring stable operation of all PMSGs in WPP, especially under high wind speed conditions.
Highlights
Wind power is increasingly integrated into the modern power system and will be a major source of electrical power in the near future [1,2,3]
This paper proposes a control scheme with adaptive gains for a permanent magnet synchronous generator (PMSG)-based wind power plant (WPP)
Gains of PMSGs are adjusted adaptively based on the maximum reactive power capacity (MRPC), which is closely related to input wind
Summary
Wind power is increasingly integrated into the modern power system and will be a major source of electrical power in the near future [1,2,3]. The proposed control scheme aims to make full use of the MRPC retained in a WPP to improve the voltage support performance while ensuring stable operation of all PMSGs, especially under the high wind speed conditions. The adaptive droop gain of each PMSG is set to be proportional to its current MRPC that is a function of current wind speed and is spatially and temporally dependent due to the wake effect, so that a PMSG with a large MRPC makes a greater contribution to voltage regulation by setting a larger droop gain, and a PMSG with a small MRPC ensures stable operation during voltage control by setting a smaller droop gain. The validity of this proposed strategy is extensively demonstrated under various wind conditions using a PSCAD/EMTDC simulator
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