Journal of Modern Power Systems and Clean Energy

ISSN 2196-5625 CN 32-1884/TK

Integrated Frequency-constrained Scheduling Considering Coordination of Frequency Regulation Capabilities from Multi-source Converters

1.Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
2.China Suntien Green Energy Limited Company, Shijiazhuang 050011, China
3.State Grid Jibei Electric Power Company, Beijing 100054, China

Fund Project:

This work was supported by the National Key Research and Development Program of China (No. 2021YFB2400500) and the Science and Technology Project of State Grid Corporation of China “Fast control of photovoltaic and wind power plant for transient frequency/voltage support”.

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    As the proportion of renewable energy (RE) increases, the inertia and the primary frequency regulation (FR) capability of the power system decrease. Thus, ensuring frequency security in the scheduling model has become a new technical requirement in power systems with a high share of RE. Due to a shortage of conventional synchronous generators, the frequency support of multi-source converters has become an indispensable part of the system frequency resources, especially variable-speed wind turbine generation (WTG) and battery energy storage (BES). Quantitative expression of the FR capability of multi-source converters is necessary to construct frequency-constrained scheduling model. However, the frequency support performance of these converter-interfaced devices is related to their working states, operation modes, and parameters, and the complex coupling of these factors has not been fully exploited in existing models. In this study, we propose an integrated frequency-constrained scheduling model considering the coordination of FR capabilities from multi-source converters. Switchable FR control strategies and variable FR parameters for WTG with or without reserved power are modeled, and multi-target allocation of BES capacity between tracking dispatch instruction and emergency FR is analyzed. Then, the variable FR capabilities of WTG and BES are embedded into the integrated frequency-constrained scheduling model. The nonlinear constraints for frequency security are precisely linearized through an improved iteration-based strategy. The effectiveness of the proposed model is verified in a modified IEEE 24-bus standard system. The results suggest that the coordinated participation of BES and WTG in FR can effectively reduce the cost of the scheduling model while meeting frequency security constraints.

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  • Received:November 01,2022
  • Revised:January 10,2023
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  • Online: January 22,2024
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