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| VSC-HVDC Stability Analysis and Control Parameter Setting |
| Li Guoqing1, Sun Yinfeng2, Wu Xueguang3, 4 |
1. School of Electrical Engineering Northeast Dianli University Jilin 132012 China;
2. School of Electrical & Electronic Engineering North China Electric Power University Beijing 102206 China;
3. Global Energy Interconnection Research Institute Beijing 102211 China;
4. Beijing Key Laboratory of DC Power Grid Technologies and Simulation Beijing 102211 China |
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Abstract According to the characteristics of the voltage source converter based high voltage direct current (VSC-HVDC), the paper divides the stability analysis of VSC-HVDC into two parts, namely VSC-HVDC DC side stability analysis and AC-DC interconnected stability analysis. Regarding the DC side stability analysis, the VSC-HVDC simplified circuit in complex-frequency domain is established, and then the equivalent loop gain is obtained, at last Middlebrook criterion judges the stability of VSC-HVDC. For the stability between VSC-HVDC and AC network, its stability principle is firstly discussed, and then the equivalent circuit of VSC is built by the structure diagram of the current loop control in dq reference frame, finally the equivalent admittance expressions of converter station are deduced. Thereafter, the AC impedance is tested through the uncharacteristic harmonics current injection method, while the frequency domain characteristic of AC-DC impedance ratio is used as stability judging criterion to find the stable control parameters domain. The time domain electromagnetic transient simulation in PSCAD/EMTDC shows the impacts of different AC impedances on VSC-HVDC system stability, which verifies the proposed stability criterion analysis and control parameter setting method.
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Received: 25 November 2016
Published: 29 March 2017
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2017, Vol. 32 
