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

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Available Transfer Capability assessment of AC/DC transmission system

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

引用

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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ATC determination for the AC/DC transmission systems using modified CPF method

ATC determination for the AC/DC transmission systems using m...

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International Conference on Critical Infrastructures, CRIS

作者： Zhongjie Chen 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 Beijing China

With the expansion of the power systems, DC power transmission has been increasingly applied in interconnection of grids. The determination of Available Transfer Capability (ATC) for the AC/DC transmission systems is significant to the system planning and operation. So far, most studies have been focused on ATC determination for AC transmission systems, few are on the AC/DC system ATC determination. In this paper, the ATC determination model for the AC/DC systems is proposed. Multi-terminal DC (MTDC) system is considered in ATC computation model. Conventionally, the power injection variations are determined by load variations and generation dispatch, both of them are nonlinear. To model these nonlinear variations, an alternate iterative continuation power flow (CPF) method with multiple load variations and generation economic dispatch patterns is presented to solve the proposed model. The MTDC system configurations, the converter control strategies and the transformer's tap adjustment strategies are incorporated to this modified CPF algorithm. The modified IEEE 30-bus test system is used to verify the presented approach.

关键词： Equations

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Notice of Retraction: Study on dynamic Peak power Compensator

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

引用

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

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

引用

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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Study on sequence component based fault phase selector during power swings

Study on sequence component based fault phase selector durin...

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International Conference on Critical Infrastructures, CRIS

作者： Wei Li Tian-shu Bi Qi-xun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

For digital distance relays, in order to get the correct measuring impedance, phase selector is widely used to identify the fault phases first. However, when a fault occurs at the line during power system swings, the traditional sequence component based phase selector might not identify the fault phase correctly, which leads to mal-operation of distance relays. Therefore, how to improve the existing sequence component based phase selector, especially at the condition of power system swings, is crucial. The relationship between the relative phase and amplitude of the sequence component of various asymmetric faults is analyzed. An improved asymmetric fault phase selector during power swings is proposed according to the corresponding relationship between the zero, negative sequence current components and the asymmetric fault types. The simulation results have shown the effectiveness of the method under power swings. Combining with fault component phase selector in no power swing, this method can perfectly solve the phase selection problem of transmission lines.

关键词： Grounding

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Compensation strategy of switching dead-time effect based on frequency domain model

Compensation strategy of switching dead-time effect based on...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

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

The problem of current waveform distortion because of dead-time inserted in power electronic applications is analyzed and researched in this paper, and the equivalent voltage source model is set up in to analyze the low frequency harmonic voltage because of dead-time effect. The control strategy of harmonic injection is proposed to compensate the current distortion due to dead-time effect. Firstly, obtains the application output current amplitude and phase of mainly harmonic current by Fourier transform, then calculates the compensation instructive voltage according to the connected inductor and dc voltage. Based on H-bridges cascaded static synchronous compensator (STATCOM), the experiment on a STATCOM based on digital signal processor (DSP) and (Field Programmable Gate Array) FPGA is implemented. The simulation and experimental results show that the proposed method is feasible and efficient to compensate the current distortion.

关键词： Frequency domain analysis Harmonic distortion Harmonic analysis Automatic voltage control Field programmable gate arrays power electronics power system harmonics Low voltage Fourier transforms Inductors

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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...

引用

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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Using SVC for SSO Damping and Its Side-effects on the AC system

Using SVC for SSO Damping and Its Side-effects on the AC Sys...

引用

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

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

This paper briefly introduces the first project in China using a Static Var Compensator (SVC) to damp Sub-Synchronous Oscillations (SSO) excited by fixed series compensation. Since the SVC function of this project is to damp SSO, it is necessary to study its side-effects on the ac system when damping SSO. A real time digital simulator (RTDS) model for this project is developed and a closed-loop test platform is established, which is comprised of an RTDS and a physical SVC controller. Based on the platform, this paper studies the side-effects of the SVC including transformer overload, ac system transient stability and relay malfunction. Simulation and theoretical results show that all these side-effects are acceptable and will not effect the operation of the ac system.

关键词： Static VAr compensators Damping power generation power capacitors Testing Laboratories Shafts Thyristors power system stability power transmission lines

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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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A new substation configuration algorithm based on the graphic characteristic of the main electrical connection

A new substation configuration algorithm based on the graphi...

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International Conference on Critical Infrastructures, CRIS

作者： Jinfang Zhang Zengping Wang Yagang Zhang 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

In order to overcome some disadvantages of the conventional adjacent matrix method, the relationship between the elements of the adjacent matrix and the connected routes among nodes is analyzed as the fundamental introduction. Subsequently, the graphic characteristic of the main electrical connection in power plant or substation is extracted as three types: single branch, two branches in-parallel and multi-branches in-parallel, and an unified principle for the formulation of connected routes among arbitrary two nodes in wiring connection is also proposed as the cornerstone for the novel method. Thirdly, a novel method of substation configuration is established based on the set of connected routes among arbitrary two nodes, and by mean of taking the route state as variables, the value of connected routes set is used to directly determine the element in corresponding place of the adjacent matrix. Finally, the example results show that the new method is able to finish the original topology analysis and track the state status of switches more accurately and rapidly.

关键词： Substations Topology Algorithm design and analysis Graphics Network topology Bridges

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