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Wu F.-F.,State Key Laboratory of Power Transmission Equipment and System Security and New Technology | Liao R.-J.,State Key Laboratory of Power Transmission Equipment and System Security and New Technology | Yang L.-J.,State Key Laboratory of Power Transmission Equipment and System Security and New Technology | Liu X.-H.,Zibo Power Supply Company | And 2 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2013

An improved multi-component two-dimensional hybrid model is presented for the simulation of Trichel pulse corona discharge. The model is based on the plasma hydrodynamics and chemical models, including 12 species and 27 reactions. In addition, the photoionization and secondary electron emission effects are taken into account. Simulation is carried out on a bar-plate electrode configuration with an inter-electrode gap of 3.3 mm, the positive potential applied to the bar being 5.0 kV, the pressure in air discharge being fixed at 1.0 atm, and the gas temperature assumed to be a constant (300 K). In this paper, some key microscopic characteristics such as electric field distribution, net charge density distribution, electron density distribution at 5 different instants during a Trichel pulse are analyzed emphatically. Further more, the electron generation and disappearing rates, positive and negative ion distribution characteristics along the axis of symmetry are also investigated in detail in the later Trichel pulse cycle. The results can give valuable insights into the physical mechanism of negative corona discharge. © 2013 Chinese Physical Society. Source

Liu W.,Beijing Jiaotong University | Dou Z.,Beijing Jiaotong University | Wang H.,Zibo Power Supply Company
IEEE Transactions on Plasma Science | Year: 2015

Electrode structures have an important effect on the electric-field strength at the cathode tip in vacuum. Effectively increasing the electric-field strength at the cathode tip can contribute to increasing the density and energy of vacuum-arc discharge plasmas. In this paper, a tubular electrode is designed and employed as the anode. The electric-field distribution of the electrode was simulated using the software package Maxwell 3-D. Through a series of simulated experiments, the factors that affect the electric-field distribution were explored, including the length of the tubular anode and the relative positions of the electrodes. In addition, the effect of an insulator situated between the cathode and the anode and optimal designs for the electrode structures are discussed. The plasma parameters and thrust were measured using a Langmuir probe and a piezoelectric thin-film sensor, respectively. The experimental and simulated results indicate that optimizing the electrode structure can effectively reduce the weight of the electrodes, increase the field strength at the cathode tip, and generate higher plasma density and greater thrust. © 1973-2012 IEEE. Source

Wu X.,Qingdao University | Zhang Y.,Qingdao University | Wei X.,Zibo Power Supply Company
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2016

The steady-state performance of a Y-connected three-phase self-excited induction generator (SEIG) with unbalanced loads was analyzed, which focuses on the voltage variations of the SEIG. Based on the Z-parameter two-port network and the symmetrical component method, a two-port network model at load terminal was derived. By combining two-port network input port and output port, respectively, with positive sequence equivalent circuit and negative sequence equivalent circuit of the induction generator, a novel equivalent circuit model for supplying unbalanced loads was developed. The universally combined equivalent circuit was utilized to analyze asymmetrical steady state performance of a three-phase SEIG, which decoupled two variables and was of less operation time. The calculated values are in agreement with the experimental values for a sampled SEIG, which verifies the validity and accuracy of the presented method. © 2016 Chin. Soc. for Elec. Eng. Source

Qu K.,Shanghai University of Electric Power | Jin X.,Shanghai University of Electric Power | Xing Y.,Shanghai University of Electric Power | Ding Z.,Shanghai University of Electric Power | Chen W.,Zibo Power Supply Company
PEAM 2011 - Proceedings: 2011 IEEE Power Engineering and Automation Conference | Year: 2011

Based on six divided regions of space vectors, the potential position of the reference voltage vectors is firstly determined according to the principle of rotating vector normalization method. Then the effective time of three synthesized vectors is calculated by the principle of the volt-second balance principle. Last the working orders starting with the positive small vectors is proposed. Simulation results are included for verifying the validity of the proposed SVPWM method. © 2011 IEEE. Source

Yang F.,Chongqing University | Liu Z.,Chongqing University | Luo H.,East InnerMongolia Electrical Power Company. LTD. | Liu X.,Zibo Power Supply Company | He W.,Chongqing University
IEEE Transactions on Magnetics | Year: 2014

In this paper, the meshless method is used to calculate the ion flow field under the high-voltage direct current transmission lines for the first time. The meshless local Petorv-Galerkin method is employed to solve Poisson's equation, and the upwind meshless method is applied to solve the current continuity equation. After the validity of the method is tested, the distribution of electric field and ion current density at ground level with different temperature and altitude of the transmission lines are discussed. The results show that the electric field and the current density are greater when the temperature and altitude are higher. © 1965-2012 IEEE. Source

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