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Comprehensive assessment of voltage sag considering reliability and economy

Comprehensive assessment of voltage sag considering reliabil...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Xiaodong Yang Guodong Li 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

ISBN: (纸本)9781424449347

The reliability of electricity supply is required by users increasingly, and whether to invest the reliability and voltage quality has been a point of contention. Thus, the assessment of voltage sag becomes acute. In this paper, the acceptable indices considering system performance and user characteristics are proposed for comprehensive assessment of voltage sag, including the reliability of the system and economy of users. The comprehensive assessment strategy, based on analytic hierarchy process (AHP), is applied to the assessment process for integrate the independent variables of the indices function. All the factors of users can be collected accurately from historic data, and the effectiveness of the method proposed in this paper is proved by the analysis of IEEE RBTS system.

关键词： Voltage fluctuations power supplies power quality power system reliability Frequency Economic indicators IEEE members system performance power generation economics Impedance

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Design of integrative fuzzy logic damping controller of VSC-HVDC

Design of integrative fuzzy logic damping controller of VSC-...

引用

IEEE PES power systems Conference and Exposition, PSCE

作者： Sheng Li Jianhua Zhang Guohua Zhang Jingfu Shang Mingxia Zhou Yinhui Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This paper design an integrative ancillary fuzzy logic controller for the Voltage Source Converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/ DC system by damping the oscillation effectively after disturbance. The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. No detailed model of the system is required for the design of the proposed control scheme. The controller judges the operation states and the control effect and synthetically adjusts its active power and reactive power order in an adaptive way by using fuzzy rules, so as to damp out the area mode oscillation. An IEEE 4-generator AC/DC power system is built in PSCAD. Integrative ancillary fuzzy logic controllers is designed in Matlab and interfaced with PSCAD. Simulation results have shown that the integrative controller can enhance the dynamic stability of interconnected power systems effectively and is robust to the variation of system operating conditions and oscillation modes.

关键词： Fuzzy logic Damping PSCAD Converters power conversion power system stability power system interconnection power system simulation power system dynamics Robust stability

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Stability analysis of the initial period of power system restoration using the path including VSC-HVDC

Stability analysis of the initial period of power system res...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Guangkai Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424427994

The stability problem during the initial period of power system restoration is mainly related with the following aspects. It is infirmly to resist interference since the power system scale is not large. It is easy to result in instability or short circuit fault for frequently and quickly load change. It is easy to arouse generation self-excited problem for the fewer load in total. Based on these characteristics of VSC-HVDC, the transmission line including VSC-HVDC is selected to restore system and its circuit model is founded in this paper. The simulation results show that the system can keep stability when the system is in steady state and fault. There are no self-excited problems. The speed of charging the transmission line and restoring loads is high too. Because of the isolation of the direct line the impact to source can be avoided by the long AC line, as is favor of the quick power system restoration.

关键词： Stability analysis power system restoration Circuit stability power system stability Circuit faults power transmission lines Distributed parameter circuits Resists Interference power system analysis computing

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Notice of Retraction: Passive Islanding Detection Method for Grid Connected PV system

Notice of Retraction: Passive Islanding Detection Method for...

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International Conference on Industrial and Information systems, IIS

作者： Fei Wang Zengqiang Mi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

This article has been retracted by the publisher.

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Flow transferring identification algorithm with consideration of transient period

Flow transferring identification algorithm with consideratio...

引用

IEEE General Meeting power& Energy Society

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

Cascading trips caused by flow transferring are crucial for lots of well-known blackouts. For a power system with heavy load flow, once there is a fault, the system might suffer flow transferring after the fault clearing. However, for relays, they cannot know the sensing overcurrent is caused by internal faults or flow transferring. The relays will trip the overcurrent after the predefined time delay, which might result in flow transferring again and worsen the system state. Therefore, if relays pickup due to flow transferring, the back-up relay should be blocked until the thermal limit of the line reaches. In this paper, Flow Transferring Relativity Factor (FTRF) is suggested to estimate the flow distribution after a line is tripped. Moreover, based on the relationship of node injection and branch currents, the impact of transient period on the flow distribution is analyzed. Finally, a flow transferring identification algorithm is presented to distinguish flow transferring from internal fault caused by fault clearing. The simulation results of 10-generator 39-bus New England system show that the proposed flow transferring identification algorithm works well.

关键词： power system protection power system faults power system relaying power system dynamics power system transients Wide area measurements Fault diagnosis power system security Bismuth Delay effects

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The implementation of fuzzy adaptive PI controller in VSC-HVDC systems

The implementation of fuzzy adaptive PI controller in VSC-HV...

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IEEE PES power systems Conference and Exposition, PSCE

作者： Haifeng Liang Gengyin Li Ming Zhou Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Changping North China Electric Power University Beijing China

Focusing on the passive network, this paper analyzes the discrete mathematical model and its control strategy of the passive terminal of the VSC-HVDC system on the basis of the alpha-beta frame of axes. The method of the functioning-fuzzy-subset inference is introduced into automatic regulation of the proportional integral (PI) parameters. Based on the digital signal processor (DSP), the fuzzy PI control method is adopted and the VSC-HVDC experiment device is constructed. The experiment of constant AC voltage control based on fuzzy adaptive PI controller in transmitting power to passive network via VSC-HVDC system is developed. The experimental results show that the fuzzy controller with adaptive PI parameters for AC voltage control of VSC-HVDC system is effective.

关键词： Fuzzy control Fuzzy systems Programmable control Adaptive control Control systems Voltage control Automatic control Passive networks Mathematical model Digital signal processors

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Substation Reactive power and Voltage Control Using Fuzzy Control Theory

Substation Reactive Power and Voltage Control Using Fuzzy Co...

引用

International Conference on Industrial and Information systems, IIS

作者： Zengqiang Mi Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424439362

In this paper, with analyzing the existing questions of conventional nine-area voltage and reactive power integrated control method, a new fuzzy control logic based dynamic reactive power boundary substation voltage and reactive power integrated control method is proposed. The fuzzy logic control strategies of this method can finish the decoupling control of voltage and reactive power in tight coupled zone to improve the control performance, dynamic reactive power boundary related to the system voltage can preferably adapted to the load characteristics. The system structure, fuzzy logic control rules and membership function of the proposed method are introduced. Simulation results and practical operating data have proved that this approach shows better robustness and performance compared with the conventional nine-area control method, it can reduce the adjust times of transformer tap and capacitors effectively and increase the service life of the transformer tap changer and capacitors switch.

关键词： Substations Reactive power control Voltage control Fuzzy control Control systems Centralized control Fuzzy logic Fuzzy sets Switches power system stability

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Analysis on measuring performance of three Flicker Detecting Methods

Analysis on measuring performance of three Flicker Detecting...

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IEEE General Meeting power& Energy Society

作者： Qing Chen Xiufang Jia Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Voltage fluctuation and flicker is an important aspect of power quality. The core of flicker analysis is to track the envelope of voltage signals and then calculate the short-term flicker severity P st , which is the premise of flicker source location. This paper firstly derives the formulas of extracting flicker envelope of signals containing harmonics using Teager energy operator and Hilbert transform. Then the measuring performance of Teager energy operator, Hilbert transform and square demodulation of flicker with one frequency, multi-frequencies and with harmonics are analyzed. After extracting the flicker envelope, the flicker frequency and amplitude error, and short-term flicker severity P st error are calculated. Besides the relationships between amplitude error and frequency, P st error and frequency with respect to these three methods are illustrated respectively. At last it is proved that Hilbert transform has the highest accuracy and stability than TEO and square demodulation with the increase of frequency.

关键词： Performance analysis Voltage fluctuations Demodulation power quality Signal analysis Position measurement Energy measurement Frequency measurement Harmonic analysis Stability

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New Topological Structure of Combination Switch Based Reactive power Compensation Installation

New Topological Structure of Combination Switch Based Reacti...

引用

Pacific-Asia Conference on Circuits, Communications and systems, PACCS

作者： Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A new topological structure of combination switch based reactive power compensation installation is presented in this paper. The new topological structure overcomes those shortcomings of traditional product satisfactorily by take advantage of the features of new system topological structure: concise structure, flexible configuration, high speed communication and powerful capacity of resisting disturbance. The new system topological structure and software program design features of this new installation are described in detail, contrastive analysis and practical test between the new installation and the traditional product are discussed. The results show that the new installation not only has the virtue of: structural standard, simply connection, intelligent identification, easy to extend, high reliability and high power density, but also improves the performance index by means of integrated intelligent control principle and compensation capacity dynamic modification.

关键词： Switches Reactive power ISO standards Reactive power control power system dynamics Control systems Communication system control power system reliability Low voltage Access protocols

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Complete-independent control strategy of active and reactive power for VSC based HVDC system

Complete-independent control strategy of active and reactive...

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IEEE General Meeting power& Energy Society

作者： Chengyong Zhao Chunyi Guo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

The performance of VSC based HVDC system partially depends on its control strategy. Based on the steady state model of VSC-HVDC system, a power control strategy is proposed and a series of mathematical analysis expressions for power delivery are deduced using the coordinate conversion and variables substitution in terms of the original equations. The corresponding power controllers are designed using the PI controller and the nonlinear inverse system. Based on the strategy designed, the transmission limits of active power and reactive power are deduced. According to the circle characteristic of operation represented, it is proved theoretically that the control strategy can independently control the active and reactive power. Case studies are also carried out to testify the control strategy designed using the PSCAD/EMTDC software. Simulation results verify that the power control strategy designed can independently control active power and reactive power and the controllers have rapid responding speed, desirable stability, and highly steady state control accuracy.

关键词： Control systems Reactive power control HVDC transmission Steady-state power control Nonlinear control systems Mathematical model power system modeling Mathematical analysis Nonlinear equations

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