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Analysis of converter topological structure for direct-drive wind power system with PMSG

Analysis of converter topological structure for direct-drive...

引用

International Conference on power system Technology (powerCON)

作者： Zheng Chen Xiangning Xiao Haitao Wang Mengwei Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and control under Ministry of Education North China Electric Power University Beijing China

Wind energy has drawn worldwide attention. Because of simple structure, high efficiency, stable operation and other inherent advantages, variable speed constant frequency (VSCF) direct-drive wind power generation system using permanent magnetic synchronous generator(PMSG) is the development trend and one of the focuses of wind power generation system, on which this paper researches through its converter's topological. To be the interface between PMSG and the grid, typical converter topology structure of direct-driven wind power system with PMSG are analyzed, including the diode rectifier + DC to DC converter + inverter, and the back to back double PWM converter. The topological characteristics and applications of some high-voltage, high-power converters are introduced in detail, including Diode-clamped multi-level converter, Cascaded H-bridge multilevel converter and Flyingcapacitor multilevel converter. Their implementations, working principles, advantages and disadvantages are discussed and compared. Judging from the current situation, for the advantages of low-cost and simple control strategy, diodeclamped three-level PWM converter is the hot spot of current converting technique study for direct-driven wind power system.

关键词： Wind power generation Topology Generators Rectifiers Pulse width modulation converters Reactive power

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A novel SSR-damping scheme based on a single-phase SSSC

A novel SSR-damping scheme based on a single-phase SSSC

引用

International Conference on power Electronic Drives and Energy systems for Industrial Growth

作者： Xiangning Xiao Benfeng Gao Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring And Control under Ministry of Education North China Electric Power University Beijing China

A three-phase unbalanced system will reduce mechanical and electrical energy interaction and thus, to some extent, inhibit subsynchronous resonance (SSR). Based on this principle, a compensation method using a single-phase static synchronous series compensator (SSSC) is proposed. In this method, only one phase employs an SSSC to replace part of the fixed series capacitor, while the other two phases have fixed series compensation (FSC). By controlling the SSSC, the three-phase reactance at power frequency is balanced, while at sub-synchronous frequencies, the system is unbalanced and thus inhibits SSO. A single-phase SSSC model based on a cascaded H bridge topology is built for time-domain simulations. The damping effect and the minimum degree of compensation required from the SSSC are analyzed by transient simulations. Simulation results show the method can effectively restrain SSO and has little effect on the three-phase voltage unbalance factor. Compared with employing SSSC in all three phases, this method is more economical.

关键词： Damping power capacitors Torque Generators Capacitance Time domain analysis

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A new load model suitable for transient stability analysis with large voltage disturbances

A new load model suitable for transient stability analysis w...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Xiao-yu Zheng Ren-mu He Jin Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Load model has great impacts on the power system simulation results, while in transient stability analysis the traditional load models have some disadvantages which can't describe the load shedding characteristic when low voltage disturbances happened. Thus, a new load model is proposed in this paper after the investigation of the field measurement data and the load characteristics of some equipment under low voltage. Several new parameters describing the load shedding characteristic are provided in the new load model which can be derived by identifying the field data. With these new parameters, the load difference caused by the load shedding during the low voltage disturbances can be well illustrated. The improved load model has larger application ranges and better properties in describing the nature of the load dynamic behaviors during the transient stability analysis which also improves the reliability of the simulation. The field measurement data illustrate its efficiency.

关键词： Load modeling power system dynamics Analytical models Stability analysis Data models Induction motors

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Notice of Retraction: Study on dynamic Peak power Compensator

Notice of Retraction: Study on Dynamic Peak Power Compensato...

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

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

This article has been retracted by the publisher.

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Available Transfer Capability assessment of AC/DC transmission system

Available Transfer Capability assessment of AC/DC transmissi...

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International Conference on power system Technology (powerCON)

作者： Yajing Gao Jin Yang Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

With the increasing expansion of AC/DC transmission system scale, the research on Available Transfer Capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. Most of the existing ATC calculation methods are mainly based on deterministic techniques and suitable for AC transmission system. In practical power systems, there are large amount of uncertainties which can effect the operation of AC/DC transmission system, and power system is dynamic and time-varying. A novel approach is proposed to analyze relevant features of ATC and calculate ATC based on sequential Monte Carlo-Frequency and Duration (FD) considering uncertainties and time variation of AC/DC transmission systems. The algorithm MATlab6.5 is developed. Modified IEEE-14 node test system is used to verify the presented approach.

关键词： Artificial neural networks Maintenance engineering

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Parameters optimization of HVDC control system based on Simplex Algorithm in RTDS

Parameters optimization of HVDC control system based on Simp...

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International Conference on Critical Infrastructures, CRIS

作者： Zhuo Jia Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

The performance of HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of HVDC system are very few up to now. And when the optimization task comes to RTDS, it becomes more complex. This paper introduces the Simplex Algorithm and its application in real time simulation (RTDS). The system objective functions are adopted to optimize the PI parameters of constant current (CC) control at the rectifier and the extinction-angle control at the inverter for Three Gorges-Shanghai ±500 kV DC Transmission Project on the basis of the control strategy. After the optimization process was finished, the performance of the PI controller with the optimized parameters was compared with that of the PI controller with the initial parameters. The step responses of those two PI controllers were presented by figures. And it shows that the controller with the optimized parameters has strong robustness.

关键词： HVDC transmission Optimization Rectifiers Inverters control systems Voltage control Robustness

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A new algorithm based on the morphological gradient for avoiding mal-operation of transformer differential protection

A new algorithm based on the morphological gradient for avoi...

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IEEE General Meeting power& Energy Society

作者： J. Gu T. Zheng S. F. Huang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

To avoid the mal-operation of transformer differential protection when external fault occurs with current transformer (CT) saturation, a new algorithm based on the mathematical morphology is put forward in this paper. Unlike the conventional Time Differential Method, the new algorithm only needs detecting the instant of fault occurring, while the instant of differential current appearance is no more needed. A new current waveform is obtained by a symmetrical transformation of initial part of differential current after fault occurrence, and then its characteristic is exacted by morphological gradient. In the case of CT serious saturation, a discrimination of external fault and internal fault can be clearly made by this algorithm. In addition, analysis shows that the new algorithm based on the mathematical morphology could also be applied for the identification of transferring fault (external fault transfers to internal fault). Simulation results of MATlab validate its feasibility and reliability.

关键词： Circuit faults Fault currents Computed tomography Time division multiplexing Current transformers Morphology Transient analysis

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Identification of backbone-grid in power grid based on binary particle swarm optimization

Identification of backbone-grid in power grid based on binar...

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International Conference on power system Technology (powerCON)

作者： W. H. Yang T. S. Bi S. F. Huang A. C. Xue Q. X. Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Previous blackouts demonstrate that the safe and stable operation of backbone-grid plays a key role in preventing large-scale blackouts caused by cascading failures. Based on binary particle swarm optimization, a novel method is proposed to identify the backbone-grid in power grid. First, the concept of the backbone-grid is defined for mathematically describing the critical lines and important topology structure which are crucial for power system to prevent the blackout caused by cascading failures. On this basis, the problem of exploring backbone-grid is further formulated as a mixed integer nonlinear programming problem which is to be solved with binary particle swarm optimization. The problem just needs to be optimized only once. The backbone-grid essential to the safe and stable operation of power grid can be obtained. Simulation on IEEE RTS-79 system verifies that the proposed method can identify backbone-grid with high computational efficiency.

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Application of microgrid in distributed generation together with the benefit research

Application of microgrid in distributed generation together ...

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IEEE General Meeting power& Energy Society

作者： Zhe Zhang 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 China

Microgrid technologies are highly developed in low voltage networks, improving the power supply reliability and energy efficiency. Therefore, in this paper, the concept, including the configuration, principle and operation of microgrid, will be specified, comparing the microgrid with the prior distributed generation. Additionally, in order to justify the feasibility, the economical benefit analysis of the application will be identified via some methodological viewpoints which are advised to regulate the operation of the microgrid in an economical approach. At the end, the costs, benefit and the share of the microgrid and micro-generation are discussed by analyzing the test case.

关键词： Distributed power generation Generators Reliability power supplies Cogeneration power system reliability

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Research and implementation of expanding the size of electromechanical transient in the hybrid real-time simulation

Research and implementation of expanding the size of electro...

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International Conference on Critical Infrastructures, CRIS

作者： Na An Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Changping China

ISBN: (纸本)9781424480807

In this paper, concerning the limitations of this method which can not meet the current needs of the development of large-scale power system, a new electromechanical transient simulation model based on dynamic equivalent is proposed. It develop a new vision for the electromechanical transient and electromagnetic transient hybrid simulation, which presents the application of dynamic hybrid simulation equivalent in hybrid simulation. Two cases are studied, electromechanical Simulation of IEEE14 nodes system, and hybrid simulation of electromagnetic transient and electromechanical transient on RTDS was developed, in the condition that the electromagnetic transient part is an actual DC system. The simulation results show that dynamic equivalence presented in the paper is valid and effective. On this basis, hybrid simulation based on dynamic equivalence is realized, thereby expanding the simulation size of AC system.

关键词： Generators power system dynamics Transient analysis Real time systems Circuit faults

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