Papers by Keyword: VSC-HVDC

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Authors: Hao Yang Cui, Yong Peng Xu, Jun Jie Yang, Jun Dong Zeng, Zhong Tang
Abstract: As the feature of faulty signal in high voltage direct current transmission technology based on voltage source converter (VSC-HVDC) system is complicated to extract and its difficult to carry on the fault diagnosis. On the basis of the PSCAD simulation model of VSC-HVDC system, the DC current faulty signal is analyzed. Then, the wavelet analysis method was adopted to extract the eigenvector of faulty signal, and combined with method of Bayesian regularization back-propagation (BRBP) neural networks, the system fault was identified. The simulation results show that the method is more efficiently and more rapidly than the adding momentum BP neural network on the VSC-HVDC system faults diagnosing.
Authors: Xin Yin Zhang, Zai Jun Wu, Si Peng Hao, Ke Xu
Abstract: Offshore wind farm is developed in the ascendant currently. The reliable operation, power loss, investment cost and performance of wind farms were effect by the integration solutions of electrical interconnection system directly. Several new integration configurations based on VSC-HVDC were comparative analyzed. For the new HVDC topology applied the wind farm internal DC bus, the Variable Speed DC (VSDC) system that is suitable for those topologies was proposed. The structure of VSDC was discussed and maximum wind power tracking was simulated on the minimal system. It is clear that new integration configurations based on VSC-HVDC has good prospects.
Authors: Jian Guo Chen, Cang Bi Yu, Ting Ting Sun, Kai Jian Ou
Abstract: Real-time simulation on the Modular Multilevel Converter (MMC) VSC-HVDC is one of the most important and difficult technologies in the area of power electronics research. After introduction and analysis on the RTDS simulation technologies for MMC VSC-HVDC study, this paper sets up the simulation model for MMC VSC-HVDC with inter control and researches on its operation and fault characteristics. Moreover, the simulation and testing system for MMC VSC-HVDC with physical control is also set up. The testing result should that, the voltage balancing method and phase disposition (PD) control strategy of the physical MMC control system perform well duing the test.
Authors: Dan Li, Ting Ting Cai
Abstract: This paper describes the use of an unbalanced control strategy to solve the faults occur in AC grid side of High voltage direct current based on Voltage Source Converter (VSC-HVDC) system. This method divides the voltage and current parameters into negative-sequence and positive-sequence. It can be obtained that the negative-sequence appears as double-frequency component in the positive-sequence synchronous reference frame; while, it appears as dc component in the negative-sequence synchronous reference frame. To mitigate the unfavourable impact of the unbalance fault, such as the DC link ripples, the dual vector control algorithm in dq synchrounous reference frame is designed. Simulation results demonstrate the validity and the effectiveness of the proposed control scheme.
Authors: Neng Qian Jiang, Yi Feng Xie
Abstract: VSC-HVDC has become prior transmission way in delivering off-shore wind power. This paper studies offshore wind system based on DFIG (Doubly Fed Induction Generator) wind turbine. The control strategy of the system during the normal and fault condition are studied. In the normal condition, the GSVSC are operated by controlling constant frequency, voltage and phases. During the fault condition, the GSVSC converted to limit current model and dc voltage link are controlled by DFIG-RSC converter. These control strategies are validated in good performance in PSCAD/EMTDC platform.
Authors: Kokou Thophile Houngan, Richard Gilles Agbokpanzo, Kizito Codja, Pierre Aguemon, Christophe Espanet
Abstract: To interconnect sources of production, it is necessary to watch that the technical parameters as tension, frequency and phase shift of the sources of production are equal. In Benin, it is difficult for the company in charge of the production and of the transport of the electricity to interconnect the production coming from Nigeria and that coming from Ghana because all the parameters are not equal. It is thus necessary to find a way to interconnect the sources of productions to satisfy not only the request in electrical energy but also to insure the continuity of the service and the stability of the electricity network [1,2]. In this work, we studied the dynamic behavior of the Voltage Source Converter based High Voltage Direct Current (VSC-HVDC) system subjected to an important variation of load and commanded by the Sine-triangle Pulse Width Modulation ( SPWM) to improve the quality of the electrical energy. We developed thus first of all the electric model of all the constituents of the system. These models allowed designing easily the control systems of the static converters VSC (the rectifier and the inverter). The simulation of the inverter showed that the rate of distortion of harmonious varied considerably according to the load for important variations of load. The solution brought by this work is the elaboration of a control system to vectorial PWM who improves the rate of distortion of harmonious.
Authors: Jian Zhang, Xin Long Zheng, Guo Zhi Chen, Zhi Gang Zhang, Bei Bei Xu
Abstract: Large-scale offshore wind power has been developed in recent years, and two possibilities are considered for the transmission system between the offshore wind farms and the onshore grid: VSC-HVDC and HVAC. The paper aims to compare both systems for 300MW offshore wind farms, 25 km, 50km and 75km from the Point of Common Coupling on an economic basis using a DCF(discounted cash flow) analysis. A linear fit to the net present values has been made, obtaining the break-even distance of 47km. When the transmission distance is shorter than 47km, the HVAC system is more economic, otherwise the VSC-HVDC system is a more cost-efficient option.
Authors: Fang Ye, Zhi Nong Wei, Guo Qiang Sun
Abstract: Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) technology is a newly deve- loped power transmission technology. The basic principle and structure of multi-terminal VSC-HVDC is introduced and its steady-state mathematical model is set up. An improved power flow algorithm is deduced, which not only decouple the relationship between AC and DC systems’ variables in the strict mathematical form, but also can be integrated with the conventional power flow program and exhibit good accuracy and convergence characteristics compared to conventional technique. A numerical example of IEEE 14-bus test system with a 3-terminal VSC-HVDC network is given. The results show that the proposed steady-state model of multi-terminal VSC-HVDC and corresponding power flow algorithm are correct and effective.
Authors: Cheng Cheng Rao, Hai Yun Wang, Wei Qing Wang
Abstract: Rigorous transmission technology is important when large-scale wind farm is connected to the power grid. Hence, a power transmission topological framework based on VSC-HVDC is proposed. The mathematical model is built in the dq synchronous frame, and the related direct current control strategy of VSC converters are designed. The doubly fed induction generator wind farm with VSC-HVDC system are modelled in DIgSILENT/PowerFactory. Ultimately, the conditions of the short-circuit fault at the receiving-end VSC AC bus is simulated. The control scheme is proved to be effective.
Authors: Tian Liang Zhao, Shi Wu Xiao
Abstract: VSC-HVDC (high voltage direct current based on voltage source converter) is a new HVDC transmission technology based on voltage source converter. Its converter uses thyristors with the current off capability such as IGBT or GTO. VSC-HVDC system can realize passive inverting by pulse width modulation (PWM) technique. This paper introduced the structure and the operating principle of the VSC-HVDC transmission system. In addition, we studied the mathematical model of the VSC-HVDC transmission system supplying passive network in ABC stable coordinate system and in DQ rotating coordinate system. Lastly, we built the physical model of the VSC-HVDC transmission system based on PSCAD/EMTDC simulation software. We carried on various types of fault simulation and analyzed the simulation result. The result of the paper may provide reference in the further study and application of the VSC-HVDC transmission technology in the future.
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