Research on the supercapacitor support schemes for LVRT of variable-frequency drive in the thermal power plant

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Han, Qiguo^1 ; Zhu, Kai^1 ; Shi, Wenming^1 ; Wu, Kuayu^2 ; Chen, Kai^3

Hangzhou Dianzi University, Hangzhou

310018, China^1

State Grid Zhejiang Electric Power Research Institute, Hangzhou

310014, China^2

Hangzhou Donghua Electric Co. Ltd., Hangzhou

310030, China^3

关键词: DC links;    Law of energy conservation;    Low voltage ride through (LVRT);    Matlab simulations;    Thermal power plants;    Variable frequency drives;    Voltage boost;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/4/042021/pdf
DOI  :  10.1088/1755-1315/121/4/042021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In order to solve the problem of low voltage ride through(LVRT) of the major auxiliary equipment's variable-frequency drive (VFD) in thermal power plant, the scheme of supercapacitor paralleled in the DC link of VFD is put forward, furthermore, two solutions of direct parallel support and voltage boost parallel support of supercapacitor are proposed. The capacitor values for the relevant motor loads are calculated according to the law of energy conservation, and they are verified by Matlab simulation. At last, a set of test prototype is set up, and the test results prove the feasibility of the proposed schemes.