Abstract
With increasing penetration of wind power into the power system, wind power participation in frequency regulation is regarded as a beneficial strategy to improve the dynamic frequency response characteristics of power systems. The traditional power system frequency response (SFR) model, which only includes synchronous generators, is no longer suitable for power systems with high penetrated wind power. An extended SFR model, based on the reduced-order model of wind turbine generator (WTG) and the traditional SFR model, is presented in this paper. In the extended SFR model, the reduced-order model of WTG with combined frequency control is deduced by employing small signal analysis theory. Afterwards, the stability analysis of a closed-loop control system for the extended SFR model is carried out. Time-domain simulations using a test system are performed to validate the effectiveness of the extended SFR model; this model can provide a simpler, clearer and faster way to analyze the dynamic frequency response characteristic for a high-wind integrated power systems. The impact of additional frequency control parameters and wind speed disturbances on the system dynamic frequency response characteristics are investigated.
Highlights
Wind power, as one of the most developed energy generation modes, has been increasing in the modern power system, more conventional synchronous generators which enjoy the ability of frequency support are replaced by wind turbine generators (WTGs)
WTGs do not provide inherent inertia, and do not respond to system frequencies when a disturbance occurs; they pose a great challenge to the frequency stability in a power system with a high wind power penetration level [2,3,4]
To solve the frequency stability problem caused by decreased inertia in a power system with increased wind power, a large amount of research has been conducted to enable wind power to participate in system frequency regulation, so as to improve inertial response [5,6,7,8,9,10,11,12,13,14,15,16]
Summary
As one of the most developed energy generation modes, has been increasing in the modern power system, more conventional synchronous generators which enjoy the ability of frequency support are replaced by wind turbine generators (WTGs). The above studies consider the wind turbine as a negative load, ignoring the internal dynamic response characteristics of the wind turbine These are static frequency evaluation methods, and it is difficult to efficaciously reflect the dynamic frequency response characteristics of high-wind integrated power systems. A quintessential low-order system frequency response (SFR) model is widely used in power system frequency analysis due to its simple and clear calculation [19], which can effectively analyze and evaluate the frequency dynamics of power system disturbances, and can help technology policy makers to develop relevant emergency control strategies to maintain the frequency stability of the system. With large-scale wind power into the grid, the traditional SFR model is no longer suitable for high permeability wind power systems, research into the dynamic frequency response characteristics of high-wind integrated power systems becomes a crucial subject to be studied. Analytical tests and evaluations of the extended SFR model are given
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