A novel frequency constrained unit commitment considering VSC-HVDC's frequency support in asynchronous interconnected system under renewable energy Source's uncertainty

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Electric Power Systems Research Pub Date : 2024-10-12 DOI:10.1016/j.epsr.2024.111098

Danyang Xu, Zhigang Wu, Lin Zhu, Lin Guan

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Abstract

The increasing share of renewable energy source (RES) poses a challenge to the frequency security of the power system. Frequency constrained unit commitment (FCUC) serves as an effective measure to address this challenge at the operational level. This paper introduces a novel FCUC model applicable to the asynchronous interconnected system connected by voltage source converter based HVDC (VSCHVDC), fully taking into account the frequency support capability of VSCHVDC in order to reduce the demand for synchronous generators' inertia and reserve while ensuring frequency security, thereby lowering operating costs. Additionally, the uncertainty of RES is also considered. The constraint expressions for three frequency indicators are derived based on a system frequency response model that includes frequency support from VSCHVDC. The proposed model optimizes unit commitment, generation and reserve dispatch and VSCHVDC transmission power and frequency response parameters, while addressing RES uncertainty using the distributionally robust chance constrained approach. In response to the highly nonlinear characteristics of the maximum frequency derivation (MFD) constraints, we propose an intelligent sampling-based support vector machine to convexify the MFD constraints and introduce a two-stage decomposition algorithm for solving the model. The effectiveness of the proposed model is demonstrated based on a modified IEEE RTS-79 system.

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考虑可再生能源不确定性下异步互联系统中 VSC-HVDC 频率支持的新型频率受限机组承诺

可再生能源（RES）份额的不断增加对电力系统的频率安全构成了挑战。频率约束单位承诺（FCUC）是在运行层面应对这一挑战的有效措施。本文介绍了一种适用于基于电压源换流器的高压直流（VSCHVDC）连接的异步互联系统的新型 FCUC 模型，充分考虑了 VSCHVDC 的频率支持能力，以便在确保频率安全的同时减少对同步发电机惯性和储备的需求，从而降低运营成本。此外，还考虑了可再生能源的不确定性。基于包含 VSCHVDC 频率支持的系统频率响应模型，得出了三个频率指标的约束表达式。提议的模型优化了机组承诺、发电和储备调度以及 VSCHVDC 输电功率和频率响应参数，同时使用分布稳健的机会约束方法解决可再生能源的不确定性问题。针对最大频率推导（MFD）约束的高度非线性特性，我们提出了一种基于智能采样的支持向量机来凸化 MFD 约束，并引入了一种两阶段分解算法来求解模型。基于修改后的 IEEE RTS-79 系统，演示了所提模型的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.