Abstract
Boosting the capacity of grid-connected wind farms will greatly contribute to increasing the share of sustainable energy in the global generation mix. It is imperative to study the way to quantitatively assess the maximum capacity of grid-connected wind farms in combination with power system stability characteristics. In this work, a method to evaluate the maximum capacity of grid-connected wind farms considering the joint constraints of frequency and voltage stability is proposed based on the global intrinsic property of frequency stability and the local characteristic of voltage stability. Firstly, the maximum capacity of grid-connected wind farms in the power grid with high wind power penetration is assessed globally based on the frequency stability constraints, and then locally considering the voltage stability constraints of each local power grid. Further on, a quantitative method to evaluate the capacity of grid-connected wind farms is proposed based on the correlation between the local static voltage stability margin and the local capacity of grid-connected wind farms, as well as the global constraint of the maximum capacity of grid-connected wind farms. Finally, the effectiveness of the proposed method is verified by the simulation results of an actual regional power grid.
Highlights
Published: 9 February 2022To mitigate global climate change and air pollution, sustainable energy generation has been expanded rapidly around the world
To assess the value of Pw−local −max,i in turn, the quantity of wind turbines is incrementally increased in the ith local power grid by replacing synchronous generators until the static stability margin k local,i reaches its stability boundary, which is expressed as: k local,i = k p where k p is the boundary of the stability criterion for the static voltage stability constraint
After obtaining Pw−whole under the frequency stability constraints and Pw−local −max,i, Pw−local −max,∑ under the voltage stability constraints described in Section 3, the capacity of grid-connected wind farms of each local power grid needs to be quantitatively assessed
Summary
Published: 9 February 2022To mitigate global climate change and air pollution, sustainable energy generation has been expanded rapidly around the world. As the capacity of grid-connected wind farms increases, the frequency and voltage stability of the power grid shows a decreasing trend [2,3,4,5]. The current impact of wind farm integration on frequency stability is mainly studied in three aspects: wind power proportion, inertial response, and frequency regulation means. It is assumed that the local power grids A and B are to be integrated with wind farms. The local power grid B includes the generator nodes JE and JD as well as the load node LH with a load capacity of
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