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In this paper I Describe the definition and characteristics of the smart grid. Systematically represent the characteristics, objectives and present status about the smart grid both in China and the United States. Based on the situation in China facing the deteriorating environment and energy crisis. How to develop China's Smart Grid in a efficient and reasonable way. At last, rom the research and...
In this paper, the system functions(S-Function) such as Tracking-Differentiator (TD), Extended-State-Observer (ESO) and Non-linear-State-Error-feedback (NLSEF) were written, the model of Auto Disturbance Rejection Controller (ADRC) was established. Through a simple second-order system as the object, the ADRC and PID algorithms were simulated. After analysis and comparison of these two different control...
The bifurcation study of power system voltage stability has an important role in understanding the voltage unstable process deeply. Bifurcation theory includes both static and dynamic bifurcation. Static bifurcation study is the primary task of bifurcation theory. The bifurcation study can analyze the impact of dynamic control performance on voltage stability especially for flexible AC system(FACTS)...
The micro grid is an integrated form of distributed energy resources. The interconnection of small modular generation technologies at the medium voltage (MV) and low voltage (LV) distribution levels may affect the power system performance. This type of the networks will use the best combination of control and modeling technologies to meet the specific capacity, quality and reliability. For the MG...
Wind power generation develops very fast in every country as a kind of important regenerative energy. The modeling of wind farm is the foundation of controlling and optimizing it. This paper introduced in detail the mathematics model at present and modeling methods in this field. What's more, it also outlined the factors what should be considered during the modeling process. At last the trend of wind...
Static Synchronous Compensator can be taken as a nonlinear system, which exists in the nonlinear problem during its operation, such as chaos. So, these instability phenomena cannot be predicted in system. This research will enhance to analyze some existing phenomena; on the other hand, the new design methods and control strategies may be possible to be developed by these researches to achieve some...
Smart grid becomes the hot topic concerning future power grid development trend home and abroad in recent years. In this paper the background, concept, major characteristics, core technologies are described. According to the key technologies of smart grid, which include a strong and flexible network topology, integrated communication system, fast simulation and modeling, advanced metering infrastructure,...
In this paper the conception, feature and Technical Composition of smart grid is expounded, and the development process and present research status of smart grid home and abroad as well as the practical significance of developing smart grid in China are introduced. The paper analyzes the characteristics and direction of China's smart grid development, and point out that the development of smart grid...
Active power filter is an effective device to clear harmonics. Accurate detection of compensated components decides its compensation effect directly. This paper proposes an advanced instantaneous detection method for distorted three-phase system voltage by detecting fundamental positive sequence voltage and current respectively using d-q transformation. Thus fundamental positive-sequence active current...
Using cascaded inverter in photovoltaic system, when number of cascaded unit increases, unbalance usage becomes a problem. Put forward the balance control method of chaos mapping and the method of photovoltaic power inspecting. It can be concluded from the distribute procedure based on random function that the active probability of each photovoltaic power and switching devices is same. The method...
Based on the basic concepts and the main methods of bifurcation theory, we introduce the dynamic bifurcation Phenomenon in the power system voltage stability analysis and the relationship between them, making a more comprehensive summary and comment about dynamic bifurcation which used in the power system voltage stability analysis currently. In the text, we discuss the Hopf bifurcation (HB), period-doubling...
Based on the mechanism of VSCF wind turbine in capturing the largest wind, the capturing methods for the largest wind energy are summarized such as the control of the tip speed ratio,, mountaineering search method and three points comparative method. The advantages and disadvantages of the study of those are pointed out. At last the developments of VSCF wind turbine With ADRC in capturing the largest...
The fluctuation and intermittent with wind power output, as a key factor to connect a large-scale wind power system to grid, which result s in an adverse impact on the power system continues to grow. In order to reduce the net stability impact of the grid. The wind farm power controller based on superconducting magnetic energy storage (SMES) is presented. Based on SMES's four-quadrant power operation...
It is of great significance for us to research security problems in the power system. After choosing static security, related theories and methods to be main research object, we calculate power flow and use transferring load as safety countermeasures for power restoration at the same time. Here, we select the Newton method. Then, making the static analysis module of PSASP as the electric power system...
This paper took the check of rupturing capacity circuit breaker in petrochemical electric power network for example. It introduced the selection rule of largest short-circuit current which flow through circuit breaker, the principle of short circuit calculation, the equivalent model of external system, the modeling of mathematical model of industrial electric owned power network, and the procedures...
Structural features has been analysed after the third part of SINOPEC Tianjin company's power system been put into operation. Node voltage been treated as the constraint, minimum power loss been treated as the objective function, used PSASP to calculated the different way of generator's combination, the voltage , power flow, power loss has been compared before and after the OPF calculation. The conclusion...
Through the Introduction of presentation structure and basic functions of a static synchronous compensator (STATCOM) controller, analysis of Reactive Power Compensation Control Method is introduced as an example for inhibit voltage flicker, oscillation damping system, excellent dynamic qualities of power system normal state transition process and the improvement of power system transient, static stability...
Grid-connected photovoltaic power system is not only related to solar battery and grid inverter technology, but also involves the system control and optimization problem. The research and improvement about control technology play a vital role in improving the efficiency of the system and Realizing optimization grid. On the basis of considering about control requirements in grid-connected photovoltaic...
In recent years, hybrid systems theory and its applications have been focus researched. At first, commonly used models of hybrid systems research were classified overviewed, and then concept of hybrid systems theory were introduced. On the basis of this, analysis and optimization of hybrid systems were summarized in this paper. At last, the applications of hybrid systems theory in photovoltaic power...
Multiple voltage stability incidents show that system dynamic components have a great impact on voltage stability. This article mainly analyzes and summarizes the impaction on voltage stability based on the bifurcation theory caused by dynamic characteristics of main components in the power system such as load characteristics, generator characteristics, OLTC and Static Var Compensator (SVC).It Proposes...
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