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A novel method for VSC-HVDC electromechanical transient modeling is presented in this paper, which eliminates coupling terms in the control system. The proposed model consists of two parts, main circuit and control system. In the main circuit, based on the theory of equivalent sources, the VSC converter with phase reactor is substituted by the controlled current source whose reference value is obtained...
Three-phase unbalance causes performance deterioration of voltage source converter based high voltage direct current (VSC-HVDC) transmission system by producing large negative sequence current in the ac side and harmonics on the dc-link voltage. Aiming at this problem, a control strategy of negative sequence voltage compensation is proposed in this paper. The solution is to generate the required negative...
With the development of modern power grid, traditional DC grid has evolved from multi-terminal HVDC (MTDC) to meshed DC grid. It can be realized through the control of converter station's output voltage when one of the branches is over limit and need to be adjusted or must regulate the power flow to follow some dispatch orders. However, in the meshed DC grid, this adjustment will also significantly...
The Solar energy is used as a kind of high effective, clean, renewable energy source. PV Generation can convert the light into electricity by PV Cells. It is obvious that PV Generation is transiting from complementary energy to substitute energy now, and it will be used as a main energy in the future all over the world. PQ Decouple Control strategy is widely used recently. The strategy can individually...
VSC-HVDC is a DC transmission system based on voltage source converter, in which the whole switches are full controlled. The new generation of HVDC transmission technology (VSC-HVDC) are based on VSC consisting of full-controlled devices and Pulse Width Modulation (PWM) technology. VSC-HVDC electromechanical transient model can meet the need of the simulation on large power grid, because electromagnetic...
In order to achieve intelligent feedback tracking of moving target, an embedded system for recognition and tracking of moving target based on the DSP chip and Camshift algorithm was designed. The system uses frame difference method to recognize the moving target and Camshift algorithm to track the moving target. Controls of the PTZ are used to track its moving path. The system demonstrates good performance...
The distributed generation (DG) has the characteristic of randomness which often results in the difference between the distributed generation actual output power and its planned value [1,2]. It is a popular method to introduce energy storage devices to compensate the difference so that to keep the power system in safe operation and qualified power quality. It is critical to determine the capacity...
Solidity is a fundamental of architectures, as well as guarantee for users' safety. Advanced structure technology constitutes dominant force promoting construction to development fast. The stone component section stress distribution, state and nature are changed by prestressed technique, and made to satisfy safety standard. In addition, the stone cold brittle has been given some elastic-plastic improvement,...
DG based on Photovoltaic System Generation (PVS) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with PVS. Firstly, the probabilistic...
DG based on wind energy system (WES) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with WES. Firstly, the probabilistic model of...
This paper studies service restoration in distribution network with distributed generation (DG). After the occurrence of fault in a distribution network, loads get disconnected and service to the affected loads should be restored through a network reconfiguration procedure. The introduction of DG has great effect on service restoration and network reconfiguration. In this paper, the impact of DG on...
Environmental stimuli associated with drug taking have been known to elicit drug craving and increase the likelihood of relapse, and sex differences have been observed in the development of drug addiction and relapse to drug taking. Differential cue paradigms (drug-related imagery scripts and drug-related paraphernalia) have been used to investigate cue-induced drug craving. However, there is little...
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