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| A Sub-Synchronous Interaction Analysis Method of Renewable Energy Generations Integrated with LCC-HVDC System Based on Damping Path |
| Gao Benfeng1, Wang Yi1, Fan Hui2, Liang Jifeng3, Zhang Jianpo1 |
1. Hebei Key Laboratory of Distributed Energy Storage and Micro-grid North China Electric Power University Baoding 071003 China;
2. State Grid Hebei Electric Power Supply Co. Ltd Shijiazhuang 050021 China;
3. Electric Power Research Institute of State Grid Hebei Electric Power Supply Co. Ltd Shijiazhuang 050021 China |
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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. Consequently, line-commutated converter-based high voltage direct current (LCC-HVDC) has become the main form of renewable energy transmission. However, according to the rapid technological development of renewable energy, more and more renewable energy bases will be connected to the near area of the LCC-HVDC transmission end. The proportion of renewable energy will increase, weakening the support capacity of conventional power supply. The interaction between the grid-connected voltage source converter (VSC) of renewable energy power generation equipment and LCC-HVDC is increasingly obvious, and this interaction has the risk of inducing sub-synchronous oscillation (SSO). The current research methods for the SSO characteristics of renewable energy generations integrated with the LCC-HVDC system mainly focus on the impedance analysis method and eigenvalue analysis method, and the research content also focuses on the judgment of SSO stability. 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. Afterward, based on the dynamic process of the dominant oscillation element, the closed-loop transfer function block diagram of the system is established, and three kinds of damping paths are obtained through analysis. The first kind of damping path reflects the internal damping of power electronic equipment, the second kind of damping path reflects the interaction between the power electronic equipment and the AC system, and the third kind of damping path reflects the interaction between different power electronic equipment. Subsequently, 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 using the concept of damping coefficient in the Heffron-Phillips-like model, thereby achieving the purpose of analyzing the influence of sub-synchronous interaction on SSO stability. For example, in the case of the direct drive wind farm integrated with the LCC-HVDC system, the path-damping characteristics of LCC-HVDC DC-link inductor dominated SSO mode are searched, 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 obviously affect 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 relevant measures can be taken to suppress SSO better. The conclusions can guide the design of controller parameters in engineering practice.
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Received: 15 August 2022
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2023, Vol. 38 
