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With the rapid growth of grid-connected wind power penetration level, it is necessary to study the impacts of wind power on power system stability. The small-signal stability of power systems with large-scale wind power is explored using the eigenvalue analysis method. A prototype sample system, the two-synchronous-generator system with a wind farm, is proposed for theoretical analysis. Then, simplified...
To increase the stability and efficiency of the Grid with wind power integration, one of the solutions is to control the active power output of wind farms. This paper focuses on wind farms with DFIG wind turbines, and analyzes the stability of DFIGs working in different control strategies. An optimized control strategy is proposed that guides the active power output of a DFIG wind farm to follow the...
Cascading tripping out of numerous wind turbines will threaten the security of power grid with high wind power penetration. It is a new security problem caused by large scale wind power integration in China. This paper focuses on those failures that happened successively in Northwest and North China 2011. Firstly, analyzes the typical failure evolution process over spatial and temporal scales, and...
Wind power variation affects active power balance in power system and challenges power grid operation. This paper studies two problems of active power balance in different time scales: peak regulation and frequency control in Inner Mongolia power grid with large-scale wind power, and discusses general measures to increase ability of wind power integration and to settle active power balance problem...
Different from traditional power system, many kinds of micro sources are widely used in microgrid. These micro sources are often called DG (Distributed Generation), such as synchronous generator, induction generator and the voltage source converter. As a result of multiple micro sources existing in a microgrid, the transient model of the microgrid used in small signal analysis is very complex. This...
Energy shortage, air pollution and greenhouse gas over emission are serious issues that the whole world is facing now. The development of electric vehicles (EVs) is one of the solutions to tackle those problems due to its special and profound significance for moderating global energy crisis, optimizing environmental protection and realizing the sustainable development. In this paper, the status quo,...
The VF (voltage and frequency control) droop control techniques are used to set the VF reference value which allows the operation of multiple VSCs in parallel to share the loads and regulate system voltage and frequency separately. In this paper, the characteristics of four VF control strategies which are: open loop VF control; VF control scheme with voltage feedback in abc reference frame; VF control...
Unified power flow controller (UPFC) is a powerful FACTS device. After analyzing the disadvantages of indexes used to evaluate the impact of UPFC on power system security at present, this paper proposes a new index system with considering the mechanism of UPFC working in power system. Then the reliability model of UPFC based on real-time operating conditions is established, and the probabilistic assessment...
Different from traditional utility grid, a microgrid contains a lot of VSC (voltage source converter) interfaced distributed generators which has more controlled variables than the common used synchronous generator. VSC can be operated in active power - reactive power (PQ) mode, active power - voltage (PV) mode, voltage - frequency mode (Vf), etc. The control strategy selection has large impact on...
Microgrids have been considered as important parts of future power systems, which are believed to be capable of solving some tough problems in large systems. In emergency, a microgrid is often required to reconfigure itself as soon as possible in order to support continuous electricity to essential loads. Types of operations, including topology switching, load shedding and generation regulation, are...
As wind power penetrations increase dramatically, wind power forecasting is increasingly becoming one of the fundamental strategies to coordinate wind generators together with thermal or other traditional generators in hybrid power systems. This paper focuses on very short term wind speed forecast based on historical wind speed data. The term wind pattern is proposed in this paper to characterize...
This paper presents the mathematical models and computer simulation for the power system of Yantai-Dalian train ferry. Firstly the system configuration is illustrated and then the mathematical models of main components are presented. Finally three typical dynamic operating scenarios are investigated through the computer simulations with Simulink. From the simulations, it is found that the machines...
Enterprise-owned power plants have been increasingly built in China recently. With a real-world case, this paper presents a comprehensive procedure to deal with the stability and security assessment of such a power system. On software platform of ETAP, eleven typical load-flow operation points are set up as base cases for static analysis and short circuit analysis, stability and security assessment...
Wind generation has been gradually changing the power source structure, which makes optimizing reactive power flow become more complicated. Three kinds of models are presented to solve the optimal reactive power flow in wind generation integrated system, in which a new model based on goal programming is proposed as constant voltage PQ (CVPQ) model. In CVPQ model, wind farm bus is considered as a PQ...
The reliability level of STATCOM devices is a key issue concerned by all the design department, manufacturing sector and application department. A k-out-of-n: G system model of STATCOM and the basic analysis method for it are proposed in this paper. The k-out-of-n: G system can be used to quantify the reliability benefit of redundancy units in main circuit of STATCOM. Utilizing the basic reliability...
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