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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Monitoring"

共 612 条记录，以下是211-220 订阅

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Enhancement voltage stability of wind farm access to power grid by novel SVC

Enhancement voltage stability of wind farm access to power g...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

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

ISBN: (纸本)9781424427994

This paper studies the voltage stability problems of wind farm access to electric grid. Based on the equivalent circuit of asynchronous machine, it deduces the relationship of wind turbine angular velocity rotation with the induction generator terminal voltage. Aiming at wind power for 10 kV distribution grid, a novel SVC is proposed to replace the fixed capacitors compensating devices. The reactive power can be detected based on the instantaneous reactive power theory and with this method the reactive power compensation is fast and continuous. The voltage level of wind farm access system is stable with a voltage feedback control strategy. The new SVC winding structure can achieve a multi-pulse, injecting the system small harmonic current component. Research results show that a corresponding control strategy of the novel SVC compensation device can be very good to improve voltage stability of wind farm access to the grid.

关键词： Voltage power system stability Wind farms power grids Static VAr compensators Reactive power Circuit stability Equivalent circuits Wind turbines Angular velocity

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A New dynamic Voltage-Var Compensator Based on SVPWM

A New Dynamic Voltage-Var Compensator Based on SVPWM

引用

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...

引用

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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Multi objectives operation of cascade inverter-based voltage quality compensator with PWM rectifier supply

Multi objectives operation of cascade inverter-based voltage...

引用

International Conference on power Electronics and Drive systems (PEDS)

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

A novel main circuit topology of voltage quality compensator (VQC) is proposed in this paper, composed of PWM rectifier and cascade H-bridges inverter. The three phase inverter is decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably and provide or absorb real power. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the voltage sag, swell and harmonic compensation is researched by theoretical and simulation. Finally, the simulation results show that the proposed main circuit topology and control strategy is feasible and efficient for multi objectives voltage quality compensation.

关键词： Pulse width modulation inverters Rectifiers Circuit simulation Circuit topology Pulse width modulation Voltage fluctuations Field programmable gate arrays PSCAD EMTDC Voltage control

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Characteristic Analysis of UHV Secondary Arc Current under Different power Transmission

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

引用

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

引用

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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A Novel dynamic Var Compensator

A Novel Dynamic Var Compensator

引用

International Conference on Energy and Environment Technology (ICEET)

作者： Chengxin Dai Zhongdong Yin Renzhong Shan Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This paper proposed a novel dynamic reactive power compensation circuit topology which is applicable to low voltage distribution system. It described the composition, features, and working principle of dynamic reactive power compensation system. Open-loop SPWM control strategy is applied for the inverter, by adjusting the inverter output voltage to dynamically regulate the absorption or emission of reactive power by SVC, zero reactive power compensation of the system can be achieved. With the combination of fixed compensation capacitor the capacity of the inverter can be smaller when it compensates the reactive power dynamically, it can improve the power factor and voltage level fast, efficiently and reliably. It overcomes the switching oscillation and the shortcomings of inadequate compensation, at the same time, reduce power loss and improve the voltage quality.

关键词： Reactive power Inverters Reactive power control Circuit topology Low voltage Open loop systems Voltage control Control systems Absorption Static VAr compensators

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A Novel Hybrid dynamic Reactive power Compensator

A Novel Hybrid Dynamic Reactive Power Compensator

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

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

A novel dynamic reactive power compensation circuit topology suitable for low voltage distribution system was proposed. The efficient compensation of unbalanced load could be realized by the structure of three-phase four-leg inverter circuit. The sinusoidal pulse width modulation (SPWM) control of inverter could ensure the low distortion of voltage and current. Besides, by the regulation of the inverter's output voltage, the compensation reactive power could be dynamically regulated and the aim of system's zero reactive power compensation could be realized. Combined with fixed capacitor compensator, small capacity of inverter is required to compensate dynamic reactive power. The novel dynamic static var compensator (SVC) could improve the system's power factor and voltage stability. Finally, simulations are carried on the platform of PSCAD/EMTDC. The results show that the proposed control strategy is feasible and efficient.

关键词： Reactive power Pulse width modulation inverters Low voltage Static VAr compensators Circuit topology Pulse inverters Voltage control Capacitors Stability PSCAD

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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...

引用

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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Study on Fault Diagnosis for power Transformer Based on Cloud Matter Element Analysis Principle and DGA

Study on Fault Diagnosis for Power Transformer Based on Clou...

引用

第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： Li PENG Fang-cheng L(U) Ning-yuan LI Hua-ping HUANG Qing XIE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Baoding 071003

ISBN: (纸本)9781424443673

Dissolved gas-in-oil analysis (DGA) is an important method to find the hidden or incipient insulation faults of oil-immersed power transformer. Matter element theory was employed to research the fault diagnosis of transformer with qualitative and quantity advantages. However, the method did not consider the uncertain essence of the fault diagnosis of transformer. And in the fact, there were two uncertain characteristic in it, random and fuzzy. Hence a new fault diagnosis method is presented in this paper. The method has two advantages of considering two uncertain characteristic and realizing fault diagnosis qualitatively and quantitatively based on cloud model and matter element theory. By building the cloud matter element models of transformer fault diagnosis and calculating the correlation function of feature matter element models and standard ones, fault modes of transformer are identified effectively. Then, the results of examples research indicate the method is effective.

关键词： power transformer DGA Cloud model Cloud matter element analysis principle Fault diagnosis

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