The Application of Auto-Disturbance Rejection Control Optimized by Least Squares Support Vector Machines Method and Time-Frequency Representation in Voltage Source Converter-High Voltage Direct Current System.

Liu YP, Liang HP, Gao ZK - PLoS ONE (2015)

Related In: Results  -  Collection

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pone.0130135.g003: The DC current wave for PI method.
Mentions: According to the theory above, we using MATLAB/SIMULINK construct the VSC-HVDC system simulation model. In particular, we carry out a contrastive simulation for the proposed method and traditional PI method, with the purpose of demonstrating the advantage of the proposed method in VSC-HVDC system. In the simulation model, the VSC-HVDC system simulation parameters are shown in Table 1. In the whole simulation process, per-unit data is adopted. The reference values are selected as follows: The reference value for the AC power voltage is 100 kV; the capacity reference value is 200MVA; the reference value for DC voltage is 200 kV. The simulation condition is as follows: the given DC voltage is 1pu (per unit), and it changes to 0.7pu at 0.3s. The given reactive power is 0. The rectifier simulation results for our proposed method and PI method are shown in Figs 3 and 4, Figs 5 and 6, Figs 7 and 8, Figs 9 and 10.

Bottom Line: Firstly, we deduce the high frequency transient mathematical model of VSC-HVDC system.We ignore the tracking differentiator in the ADRC controller aiming to improve the system dynamic response speed.On this basis, we derive the mathematical model of ADRC controller optimized by LSSVM for direct current voltage loop.

View Article: PubMed Central - PubMed

Affiliation: School of Electrical and Electronic Engineering, North China Electric Power University, Baoding, Hebei Province, 071003, China.

ABSTRACT
In order to improve the performance of voltage source converter-high voltage direct current (VSC-HVDC) system, we propose an improved auto-disturbance rejection control (ADRC) method based on least squares support vector machines (LSSVM) in the rectifier side. Firstly, we deduce the high frequency transient mathematical model of VSC-HVDC system. Then we investigate the ADRC and LSSVM principles. We ignore the tracking differentiator in the ADRC controller aiming to improve the system dynamic response speed. On this basis, we derive the mathematical model of ADRC controller optimized by LSSVM for direct current voltage loop. Finally we carry out simulations to verify the feasibility and effectiveness of our proposed control method. In addition, we employ the time-frequency representation methods, i.e., Wigner-Ville distribution (WVD) and adaptive optimal kernel (AOK) time-frequency representation, to demonstrate our proposed method performs better than the traditional method from the perspective of energy distribution in time and frequency plane.

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