You Jie Ma

Review of Electric Load Modeling Research

The effect of load model on the analyses of load flow, transient stability, small disturbance stability and voltage stability is analyzed. The importance of the load modeling research is emphasized. The development of component-based method and measurement-based method is reviewed. The advances on the load model research including the select ion of load model structure, model parameters identification, load model with the voltage stability analysis and the sensitivity of load model to the transient stability is summarized.

Control Strategy of Photovoltaic Grid-Connected Inverter

As a key component of photovoltaic grid generation system, grid-connected inverter plays an important role, and its control is paid more attention to by people. After the introduction of principle and structure of grid-connected photovoltaic inverter, the paper describes the control objectives of grid-connected, represents several current control strategies of grid-connected inverter in detail, and indicates its future development trend finally.

Summary of Smart Grid

This paper describes the connotation and characteristics of the smart grid, detailed key technologies and features of the smart grid. Finally, discusses the opportunities and challenges facing in China in the development of smart grid.

Control Methods of Active Power Filter

Active power filter (APF) is an important device to compensate harmonic and reactive current in power system control method adopted has a great influence on its performance. The paper introduces several control methods used by APF, including the deadbeat control, single-cycle control, space vector control and so on. After comparing and analyzing their individual advantages and disadvantages, some improvements for APF performance are proposed.

The Research Status and Development Trend of Active Power Filter

Power quality is getting worse with the extensive application of nonlinear loads, and active power filter technology is the effective way to settle the problem. This paper introduces the basic theory and the sorts of active power filters at first. Then the key technologies of active power filter are discussed in detail. Finally, based on some problems about current situation of active power filters, the directions of its development are analyzed in this paper.

An Overview of Micro-Grid

Micro-Grid is a small system consisting of micro-power source and the load, which provide electricity and heat for the user. Micro-grid concept proposed mainly to solve large-scale, distributed power and network diversity technically and issues on the market and policy in order to play the advantages of distributed generation technologies in the economic, energy and the environment. It can maximize acceptance of distributed power, and better meet the electricity users’ requirements of power reliability and power quality. Therefore, the research and development of micro-network is an inevitable choice for a large number of distributed generation connected to the grid. This paper briefly discusses evolution of Micro-Grid development, including the difference from conventional power system, the characteristics of Micro-Grid, the present research status, and the key technologies of Smart Grid.

Overview of Distribution Automation

A distribution system consists of all sorts of power distribution equipment, communication system and control equipment. It works according to certain rules to meet the demand of users by the high quality of electric energy . Distribution Automation (DA) can realize the automation of system operation and management to provide customers with stable, reliable electricity and obtain maximum benefits .This paper generally introduces the concept, function, developing future of Distribution Automation System. Distribution Automation includes feeder automation, automatic distribution management and user automation, and this paper introduces the basic situation and problems of them. Finally, it is concluded that Distribution Automation is the inevitable trend of Distribution System,and will be gradually developing in the direction of smart distribution grid.

Study on the Optimal Location of SMES in Power System

With the development of high temperature superconducting wire and related cryogenic technology, applications of superconducting device in power system has become the new hot spot of power engineering science research. As a perfect union of two revolutionary technologies, superconducting technology and FACTS, Superconducting Magnetic Energy Storage device (SMES) have superior properties and wide application. This article presents methods to selecting installation site of SMES device in the power system.

Research and Analysis about Static Synchronous Compensator Control

This paper describes the basic requirements of the Static Synchronous Compensator (STATCOM), analyze the specific structure of the STATCOM control system and the function of various parts can be achieved, analysis Linear PID control, Linear optimal control , Adaptive control, Differential geometry control and Intelligent Control which commonly used in the STATCOM control system. Describes two specific control methods of the STATCOM: direct current control and indirect current control.

An Overview of Smart Grid

Smart Grid is very important as it will take us towards energy independence and environmentally sustainable economic growth. This paper briefly discusses evolution of Smart Grid development, including the difference from conventional energy system, the characteristics of Smart Grid, the present research status, and the key technologies and technologies of Smart Grid.