Liu Hui-jin
Wuhan University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Liu Hui-jin.
conference on industrial electronics and applications | 2008
Cui Xue; Liu Hui-jin; Zhang Quan-ming; Ying Liming; Liao Qingfen
Bused on mathematical morphology (MM) and complex wavelet, a novel method on power quality (PQ) disturbance detection and location is presented in this paper. At first, a generalized morphology filter with horizontal linear structure elements is designed to filter impulses and random white noises in PQ disturbance signals. Numerical simulation results show that the characteristics of the original signal can be well retained and the noise interferences are suppressed effectively with the proposed filter method. Then, to the filtered results, the complex wavelet derived by Daubechies real wavelet and its compound information are applied to detect and locate the start and end time that the disturbance occurs. The voltage interruption, voltage sag, voltage swell, high frequency oscillation and harmonic distortion are used to verify the validity of the filter-location approach. Simulation results show the integrated detection approach of morphology-complex wavelet is valid and effective. Besides, it can reduce calculation time and can be implemented easily in the available hardware.
ieee international conference on power system technology | 2014
Jin Weigang; Li Yong; Wang Wenda; Guo Xiaoyun; Liu Hui-jin
This paper presents a planning method for thermal power that is combined with wind power to get the optimal transmission capacity and bundle proportion of wind power and thermal power. At first, a comprehensive index system is established which takes into account the power demand, level of safety and stability, economy of the receiving system, transmission price and etc. Then these factors are defined as the objectives of the mathematical model with multi-objective function. The non-dominated sorting genetic algorithm-II (NSGA-II) is applied to solve this multi-objective model. After obtaining the non-inferior solutions of the model, the optimal compromise solution is determined by the fuzzy membership function. The proposed scheme can obtain the optimal transmission capacity and also can guarantee the stability of the receiving power system. The simulation is conducted on the IEEE-9 system and the results verify the validation of the method.
ieee international conference on power system technology | 2010
Zhang Zhenhuan; Liu Hui-jin; Lei Xi; Xu Guizhi
The paper proposes a novel periodic adaptive L2 disturbance attenuation control algorithm for APF based on the averaged Port Controlled Hamiltonian (PCH) model. Based on the energy-dissipative property of APF state equations, the averaged PCH model in the d–q rotating frame with periodic disturbances, aperiodic disturbances and parametric perturbations is first established. The averaged PCH model of error system is further derived in terms of energy balance. Then, the influence of parametric perturbations can be converted into part of periodic disturbances and periodic adaptive L2 disturbance attenuation control algorithm is designed to suppress tracking errors resulted from parametric perturbations and disturbances: The periodic adaptive control compensates periodic disturbances, while the L2 disturbance attenuation can be used to stabilize the error system, ensure the convergence of periodic adaptive control and suppress other aperiodic disturbances. In addition, according to the demand in practical implementation, the proposed control algorithm is modified by ignoring the ripple component on dc-side capacitor reference voltage. Experimental results verify the validity of the proposed algorithm.
Proceedings of the CSEE | 2008
Liu Hui-jin
Automation of electric power systems | 2012
Jin Weigang; Liu Hui-jin
Power system technology | 2005
Liu Hui-jin
Archive | 2015
Jin Weigang; Li Yong; Cui Xue; Liu Hui-jin
Relay | 2004
Liu Hui-jin
Archive | 2015
Jin Weigang; Li Yong; Cui Xue; Liu Hui-jin
Power system technology | 2012
Liu Hui-jin