Papers by Author: Xue Song Zhou

Abstract: Shunt Active Power Filter (SAPF) is a new device for compensating harmonic currents in power system [1]. For unbalanced three-phase four-wire circuits, it need detect the total of harmonic and fundamental negative sequence and zero sequence currents at the same time. Base on traditional method of ip-iq, a detecting method which is suitable for unbalanced three-phase four-wire is proposed and analyzed by mathematical reasoning. At last, correctness of the result is verified by simulation.

Abstract: This paper introduced the understanding of the concept of smart micro-grid in domestic and international authority. It pointed out that micro-grid was an effective form to achieve active power distribution in intelligent grid and an important part of the intelligent grid. It summarized and discussed the theory of intelligent micro-grid control. [1]It divided control strategy into the follow of grid control strategy and the formation of grid control strategy. Each class contains an interactive and non-interactive control idea at the same time. It has given a clear definition and criteria for judging and proposed future direction of the intelligent micro-grid control strategy.

Abstract: This article introduces the significance of studying the Micro-grid, the definition, the characteristics ,the basic structure,the architecture and working principle of Micro-grid. Discuss the Micro-grid constitutes, including loads, distributed generation,etc. At last, it points out the disadvantages and the directions of Micro-grid, we should come to a unified definition of Micro-grid and a unified protection program and configuration,in order to get ready for the early Micro-grid research.

Abstract: With the development of economy, the energy demand is becoming bigger and bigger, the development of wind energy is one of the main ways to solve energy crisis. In terms of energy utilization, high power wind power connected to the grid is currently one of the most effective ways of wind energy utilization. The wind power generation system connected to the grid plays the role of the changing wind energy into mechanical energy by wind turbines, and then converts mechanical energy into electrical energy by a generator. Because CSCF wind turbine works with the gearbox, which is low efficiency, noise and mechanical loss. And it has not been able to meet the needs of the times. Therefore, the direct drive wind power technology capable of tracking the maximal power point of wind power at rated wind speed has become one of the hot spots in the present research. This paper introduces the converter of the direct drive wind power system and analyzes the working principle of the direct driven permanent magnet synchronous wind power system.

Abstract: By means of building up a three-dimension coordinate system in vector space, the coordinate transform used in instantaneous reactive power theory (IRPT) proposed by H. Akagi is deduced and through spatial coordinate transform two equivalent three-dimension coordinate systems are obtained. After rigorous mathematical deduction the transformation factor for above-mentioned three-dimension coordinate systems is achieved, thus the coefficient deduction for IRPT is solved and the zero-sequence quantity expressing three-phase asymmetrical system is directly obtained. By use of the theory of rotating phasor, the basic principle of instantaneous spatial vector detection method based on IRPT is explained. The authors’ analysis is available for understanding and improvement of this harmonic current detection method.

Abstract: V2G technology is an important part of the smart grid,which realizes the power inter-transformation between Power Grid and electric vehicles [1]. V2G technology is introduced and the structure of charging and discharging system in V2G technology is analyzed [2]. Under synchronous rotating frame, the combination current-controlled and Voltage space vector control method is adopted, which carries out the power inter-transformation between Power Grid and electric vehicles [3].

Abstract: Harmonics of power system seriously affected the quality of electric power. Shunt Active Power Filter (SAPF) [1] which overcomes the shortcomings of passive filter (PF) has become main technology to suppress harmonic. In this paper, structure, mathematic model, detection method and control of SAPF are mainly analyzed and reviewed. With development of key technology of APF, it will have a better application prospect.

Abstract: APF has its outstanding features comparing with PPF, it is a new type harmonic suppression and reactive power compensation device. This paper makes an introduction about two key technologies about APF, and it makes a prediction to the trend of the key technologies. APF is the main harmonic suppression technique at present and in the future. At present, there are large of loads in every industry, such as, electric arc furnace in steel industry, the welder in automotive industry, and these industries are important sectors of the national economy, we can do not stop them running, only installing APF in the appropriate location .Therefore, APF has broad prospects for development in various industries.

Abstract: In the field of renewable energy, wind energy has one of the best prospects in all industries. It is a kind of clean, practical, economic and environmentally friendly alternative energy. It also has the advantages of high energy converting rate, large industrial scale、high level technology and so on. Thus in recent years, the developing trend of global wind power industry is rapid, and the growth tide of China has been enhanced significantly. This paper discusses the general development of wind power. Based on the overview of the development of wind energy and combined with the current situation of wind power market, the development trends of wind turbine were discussed. It also proposed the problems which were existed in domestic wind power market.

Abstract: Smart Grid is the newest direction of electric power development, and is regarded as the significant technology innovation and development trend of the electric power system in 21st century. It is also regarded as the inevitable result of the development of economic and technology. It has flexible, clean, safe, economical, and friendly functions. Smart grid is a new "second generation" network, which is built on an integrated basis of two-way high-speed communication networks, through the application of advanced sensing and measurement techniques, equipment technology, control technology and decision support system technology in order to achieve reliable, safe, high-quality, economical, efficient, environmentally friendly and safe using target. Smart Grid’s background, significance key technologies, technical difficulties and prospects are introduced in this paper.