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International Conference on power Electronics and Drive systems (PEDS)

作者： Wang Ziqiang Yin Zhongdong Yang Po Li Ke key Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

In the power system, the controllable reactor can be used as reactive power compensation device to limit over-voltage operation, reduce no-load or light load loss and improve transmission capacity. It is with characters of simple structure, easy maintaining, low cost and high stability, etc. The magnetic field is closely related to the reactor performance. In this paper, aiming at a controllable saturated reactor prototype, using the finite elements method, the magnetic field is studied. Then, the precise 2-D prototype field-circuit coupling model is established based on the magnetic field analysis and the finite element analysis software - ANSYS. Using this model, the magnetic field and working currents concrete values under the condition that AC and DC excitations co-exist within the core are calculated. The analysis results indicate that finite element analysis theory can effectively analyze the magnetic field of the reactor.

关键词： Finite element methods Magnetic analysis Magnetic fields Inductors power system stability Software prototyping power system analysis computing Lighting control power system control Control systems

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A Novel MPPT Control Algorithm Based on Numerical Calculation for PV Generation systems

A Novel MPPT Control Algorithm Based on Numerical Calculatio...

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第六届IEEE国际电力电子与运动控制会议 (2009 IEEE 6th International power Electronics and Motion Control Conference-ECCE Asia

作者： Jing Hu Jiancheng Zhang Hongbo Wu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Baoding071003 China

In the future solar energy will be very important energy source. It is noticeable that the output characteristics of a PV array are influenced by the environment factors, and the conversion efficiency of PV arrays is very low. Therefore a Maximum power Point Tracking (MPPT) technique is needed to draw peak power from the solar array in order to maximize the produced energy. This paper introduces a novel MPPT control algorithm for photovoltaic (PV) power generation systems. The proposed algorithm based on numerical calculation is able to perform MPPT with only one step by quadratic interpolation. And a constant voltage tracking (CVT) startup is used in the MPPT method to enhance the accuracy and the speediness. The rationality and the feasibility of the algorithm developed in this paper are verified by building simulation model using MATLAB SIMULINK tool. The results indicate that the proposed approach can effectively improve the MPPT speed and accuracy simultaneously.

关键词： Control systems Solar power generation Photovoltaic systems Voltage power generation Solar energy Atmospheric modeling Mathematical model Costs Temperature

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Research on a Novel Series-Connected Voltage Fluctuation Generator

Research on a Novel Series-Connected Voltage Fluctuation Gen...

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International Conference on Energy and Environment Technology (ICEET)

作者： Renzhong Shan Zhongdong Yin Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University China

A novel voltage fluctuation and flicker generating main circuit topology is proposed in this paper, combined with passive and active to realize voltage fluctuation and flicker. The fundamental frequency power is supplied by system source and the other frequency fluctuation power is supplied by active components, so the capacitor of generator is easy to realize larger because of lower active loss. Full-bridge diode rectifier is adopted to maintain the stable DC-bus voltage, the later inverter is controlled by instantaneous value voltage and current double closed-loop to make sure good static and dynamic performance. The inverter output two frequency voltage waveforms, and added to fundamental frequency sinusoidal voltage waveform by transformer so that the typical sinusoidal modulation voltage fluctuation and flicker waveform is obtained. The simulation model is set up on the platform of Matlab/Simulink. Finally, the simulation and experimental results show that the proposed main circuit and control strategy is feasible and efficient.

关键词： Voltage fluctuations Frequency power supplies Inverters Circuit simulation Circuit topology Capacitors power generation Diodes Rectifiers

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Available Transfer Capability Evaluation Based on Sensitivity Analysis

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IFAC Proceedings Volumes 2009年第9期42卷 62-67页

作者： Yajing Gao Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China (Tel: +86 10 80798551)

According to the definition of Available Transfer Capability by North America Electric Reliability Council (NERC), we know that ATC not only depends on the topology of power network but also on the parameters of components. So a series of adequacy indices are proposed to evaluate ATC. Through thorough analyses on these indices, the sensitivities of components parameters to these adequacy indices are deduced. The impact of components parameters’ small variations on ATC can be reflected by these sensitivities, the importance degree of each component can be embodied. Furthermore, by sensitivity analysis we can effectively identify ATC bottlenecks and get important guide information for operation and planning. The algorithm based on MATLAB 6.5 is developed. The correctness and effectiveness of the proposed sensitivity analysis method are verified using IEEE-RTS79 test system.

关键词： Available Transfer Capability adequacy indices sensitivity analysis

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A New dynamic Voltage-Var Compensator Based on SVPWM

A New Dynamic Voltage-Var Compensator Based on SVPWM

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International Conference on Energy and Environment Technology (ICEET)

作者： Tao Huang Zhongdong Yin Renzhong Shan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

In this paper, a new dynamic voltage-var compensator is introduced, compared to the traditional SVC, the new voltage source of continuous two-way adjustable SVC has significant advantages. This paper has introduced the fundamental of the SVPWM; SVPWM control technology is an optimized PWM control technology, compared with the traditional PWM technology, SVPWM with a high utilizationrate, less harmonic control simple, easy-to-digital realization of the advantages. The simulink is used to simulation and analysis. The simulation results show this SVC has its own advantage. It can regulate the voltage smoothly and continually.

关键词： Space vector pulse width modulation Switches Voltage control Reactive power control Static VAr compensators Reactive power power system harmonics Pulse width modulation inverters Inductors Capacitors

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A protection scheme of transmission line based on nature frequency

A protection scheme of transmission line based on nature fre...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： X. G. Wang S. F. Huang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

This paper proposes a protection scheme for transmission lines based on nature frequency of fault-generated travelling wave. The fault component of current signals are first computed and decoupled into their modal components, and then the mode spectrums are computed by FFT to extra the fundamental frequency of nature frequencies, through comparing the fundamental frequency at both ends of lines to identify internal and external faults. The scheme operates rapidly, reliably and is immune to CT saturation, operation mode and transient resistance; it can endure the influences of various fault inception angles, fault location, The performance of scheme is investigated for various faults on a typical Electro-Magnetic Transient Program/Alternative Transients Program (EMTP/ATP) simulated transmission feeder.

关键词： protection Transmission lines Frequency power system transients Signal processing Fault diagnosis Fault currents Circuit faults Fault location EMTP

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Characteristic Analysis of UHV Secondary Arc Current under Different power Transmission

Characteristic Analysis of UHV Secondary Arc Current under D...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Lixia Zhou Huiyuan Zhang Jun Wen Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

Along with the enhancement of voltage level, harmful affect of the secondary arc current to the system becomes more and more serious. The transmission power of the lines is one of factors that influence the secondary arc current obviously. The voltage distribution along the transmission line will changes according to the different transmission power, which will lead to the variation of the induction component from the sound phases when the fault occurs. In this paper, the quadric-mode transformation is adopted to establish the mathematic model of secondary arc current in the double-circuit transmission line. According to the variation of power transmission, the secondary arc current of different fault point is calculated. The results indicate that secondary arc current is influenced much by the line transmission power, and the variation trend changes along with the fault point. When the fault occurs in head or terminal of the line, the secondary arc current may becomes larger along with the increasing of the transmission power, thus effective suppress measurements must be taken.

关键词： power transmission Voltage power transmission lines Mathematical model Poles and towers Capacitors Electromagnetic coupling Laboratories power system protection power system dynamics

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Interaction of torsional dynamics and loads

Interaction of torsional dynamics and loads

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8th International Conference on Advances in power system Control, Operation and Management (APSCOM 2009)

作者： W.H. Chen T. S. Bi J. Y. Fang Q. X. Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control under MOE North China Electric Power University Beijing China

The linearization equations of load models including fifth-order motor, constant impedance (Z), constant current (I) and constant power (P) are derived, which can interface with the network equations for the analysis of subsynchronous resonance (SSR). The IEEE First Benchmark Model is adopted to analyze the effect of the above load models on the damping characteristics of torsional modes. It is observed that the analysis result can be optimistic without inclusion of load models and there is no any load model which ensures that the results are always conservative.

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Study on controllable reactor magnetic structure and loss based on ANSYS

Study on controllable reactor magnetic structure and loss ba...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Z.Q. Wang Z.D. Yin L.X. Zhou Z.J. Wang L.R. Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424427994

Controllable reactor is an important voltage control and reactive power compensation device in power system which is wide range voltage application, high reliability, low harmonic and simple maintenance, etc. The reactor iron core magnetic field distribution directly affects the reactor's loss and other properties. In this paper, aiming at six kinds of typical controllable reactor core structure, magnetic field is analyzed in theory and then the core magnetic field distribution analysis are compared for the first time by model building in the finite element analysis software ANSYS and imposing different exciting currents. Moreover, six kinds of core structure's loss are compared by the use of the ANSYS inner set loss algorithm and the influence of excitation on the loss for a particular core is verified. The analysis results indicate that finite element analysis software can effectively analyze and compare the magnetic field distribution and the loss for different kinds of reactor core structure.

关键词： Inductors Magnetic losses Magnetic cores Magnetic analysis power system reliability Magnetic fields Voltage control power system harmonics Finite element methods Control systems

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Research on a Novel dynamic Voltage Quality Regulator in Medium Voltage

Research on a Novel Dynamic Voltage Quality Regulator in Med...

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International Conference on Energy and Environment Technology (ICEET)

作者： Yajing Di Zhongdong Yin Xiangning Xiao Renzhong Shan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

In accordance with the familiar power quality problem, such as voltage sag, flicker, harmonic suppression and short circuit fault, this paper designed a novel series voltage quality regulator in medium voltage for the multiple objective control basing on the cascaded multilevel H-bridge method, and analysis its working principle in detail. A Short-circuit current limiter is designed in this paper, the control strategy multiple objective control is proposed as well. The simulation model is established by PSCAD/EMTDC. Finally, the rationality of the main circuit topology design is tested through low-voltage experiment. The simulation result and the text show that the design of voltage regulator and the control strategy this paper proposed can compensate the voltage feasibly and efficiently.

关键词： Regulators Medium voltage Voltage fluctuations Voltage control Circuit simulation Circuit testing power quality Harmonics suppression Circuit faults Harmonic analysis

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