基于阻尼路径的新能源经LCC-HVDC送出系统次同步交互作用分析方法

doi:10.19595/j.cnki.1000-6753.tces.211579

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Abstract In China, wind power, photovoltaic and other renewable energy are mainly distributed in the western and northern regions, far from the load center in the eastern and central regions. Therefore, line-commutated converter-based high voltage direct current (LCC-HVDC) has become the main form of renewable energy transmission. However, due to the rapid development of renewable energy, more and more renewable energy bases will be connected to the near area of LCC-HVDC transmission end, and the proportion of renewable energy will increase, resulting in the weakening of the support capacity of conventional power supply. The interaction between grid connected voltage source converter (VSC) of renewable energy power generation equipment and LCC-HVDC is more and more obvious, and this interaction has the risk of inducing sub-synchronous oscillation (SSO). Therefore, it is urgent to study the sub-synchronous interaction of renewable energy generations integrated with LCC-HVDC system. At present, the research methods for the SSO characteristics of renewable energy generations integrated with LCC-HVDC system mainly focus on impedance analysis method and eigenvalue analysis method, and the research content also focuses on the judgment of SSO stability, while there is basically no research on the sub-synchronous interaction. Therefore, it is necessary to study the sub-synchronous interaction at the physical level from a new perspective.
This paper uses the damping path to analyze the transmission process of the sub-synchronous frequency disturbance to analyze the sub-synchronous interaction of the system. Firstly, the second-order motion equations of three kinds of oscillation dominant elements are derived. By analogy with the Heffron-Phillips model of synchronous machine rotor, the "Heffron-Phillips-like model" is obtained to analyze the stability of oscillation dominant elements. Then, based on the dynamic process of the oscillation dominant element, the closed-loop transfer function block diagram of the system established, and three kinds of damping paths are obtained through analysis, which are: the first kind of damping path reflecting the internal damping of power electronic equipment, the second kind of damping path reflecting the interaction between the power electronic equipment and the AC system, and the third kind of damping path reflecting the interaction between different power electronic equipment. Then, the closed-loop transfer function block diagram of the system is reconstructed to separate the damping of each path, and the damping of SSO mode is quantitatively evaluated by using the concept of damping coefficient in the Heffron-Phillips-like model, so as to achieve the purpose of analyzing the influence of sub-synchronous interaction on SSO stability. Finally, taking the direct drive wind farm integrated with LCC-HVDC system as an example, the path damping characteristics of LCC-HVDC DC-link inductor dominated SSO mode are studied, and the influence of controller parameters on path damping is analyzed. The results show that the sub-synchronous interaction between LCC-HVDC and direct driven wind farm mainly provides negative damping in the DC- link inductor SSO mode, which is not conducive to the stability of the system. The controller parameters have obvious influence on the path damping characteristics. By analyzing the influence of the system parameters on the path damping, the main influence links of the sub-synchronous interaction can be obtained, and then relevant measures can be taken to better suppress SSO. The conclusions can provide guidance for the design of controller parameters in engineering practice.

Key words： Renewable energy generation LCC-HVDC sub-synchronous interaction damping path damping reconstruction

Received: 15 August 2022

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TM712

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	Gao Benfeng
	Wang Yi
	Fan Hui
	Liang Jifeng
	Zhang Jianpo

Cite this article:

Gao Benfeng,Wang Yi,Fan Hui等. A Sub-synchronous Interaction Analysis Method of Renewable Energy Generations Integrated With LCC-HVDC System Based on Damping Path[J]. Transactions of China Electrotechnical Society, 0, (): 74-74.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211579 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/74

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