Both peak-regulating of the connected power grid using VSC-HVDC in normal or emergency power support each other in the case of both sides of AC system have fault via VSC-HVDC, are dependent on its rapid reversal of po...
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A three-terminal DC transmission system based on modular multilevel converter (MMC) is developed to solve the problem of power supply for distributed islands or cities. The system, with flexible features, may generate...
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This paper proposes a high-powercontrollable current quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates current quality problems, such as positive and negative curre...
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Studying the HVDC typical fault-the commutation failure and its protection measures will give some guidance for HVDC engineering, also, it will improve the AC-DC powersystem safety and reliability with great signific...
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This paper proposes a high-powercontrollable voltage quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates many types of voltage quality problems, such as voltage swell...
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The estimation of operating reserve to guarantee the systemsecurity and economic operation is an important task in powersystem operation. With the rapid increase of wind power installation and its large scale integr...
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The aim of relay protection is to isolate the fault zone or device and guarantee the systemsecurity. The primary protection and backup protection is in cooperation relationship, and backup one could not be canceled b...
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ISBN:
(纸本)9780889869059
The aim of relay protection is to isolate the fault zone or device and guarantee the systemsecurity. The primary protection and backup protection is in cooperation relationship, and backup one could not be canceled because of the DC power supply failure in substation. The fault location algorithm based on wide area information is one of the key points for novel wide area backup protection. By use of the synchronized phasor data uploaded by PMUs, the process of locating fault could be implemented in real-time or near real-time level. In this paper, based on Bayesian theory, we have studied the fault location in wide area backup protectionsystems. The simulation experiments have confirmed that the detection of fault can be resolved exactly and effectively by Bayesian theory.
To deal with reactive power optimization problem,an adaptive Niche Particle Swarm Optimization algorithm (ANPSO) is *** Evolution algorithm (DE) is easy to use and has the advantages of strong robustness,but its effic...
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To deal with reactive power optimization problem,an adaptive Niche Particle Swarm Optimization algorithm (ANPSO) is *** Evolution algorithm (DE) is easy to use and has the advantages of strong robustness,but its efficiency is limited and probably to fall into local optimum because the population loss of diversity after several *** introduces niche-sharing mechanisms to change the individual values and accelerates to eliminate individuals which have low *** radius can also be adjusted adaptively on the basis of the relative distance between individuals which reflect the aggregation of *** the above method,algorithm's global searching ability is *** proposed algorithm is tested on a realistic planning project and the results show its better performance on celerity,accuracy and efficiency.
A multi-input and multi-output linear model of multi-machine powersystem was established based on perturbation analysis, and the complex torque coefficient of target generator was deduced in detail. From a mathematic...
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A multi-input and multi-output linear model of multi-machine powersystem was established based on perturbation analysis, and the complex torque coefficient of target generator was deduced in detail. From a mathematical perspective, the meaning of complex torque coefficient was explained. Meanwhile, the reasonability about non-target generators being equivalent to different models was discussed when investigating subsynchornous oscillation phenomenon in a multi-generator system. The results showed that the complex torque coefficient method was suitable for multi-generator system and the procedure of simplifying non-target generator as single rigid body or voltage sources with fixed frequency was inappropriate. Then a case study of IEEE second benchmark verified the conclusions above.
The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed po...
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The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed powercontrol algorithm applied to PMSG is proposed, and then design the controller using tip speed radio and flux-weakening control scheme. It can not only provide a constant switching frequency without involving any synchronous speed coordinate transformation and generator side phase information, but also can reduce the capacitance of generator-side converter. Simulation and experimental results show that the proposed theoretical analysis method and control strategy is effective under the platform PSCAD/EMTDC.
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