Zongxiang Lu

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This paper studies day-ahead unit commitment in wind-coal intensive power systems. Due to their long start up time, high start up cost, and high minimum stable output, coal-fired generators do not provide a favorable environment for accommodating variable wind generation. The reduced efficiencies resulting from the coal-fired generation side as measured in(More)
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(More)
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(More)
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(More)
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,(More)
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(More)
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(More)
Wind farm time series power data is widely used in wind power integration studies and wind power forecasting. Historical time series wind power data is frequently corrupted by communication errors, wind turbine outages and curtailment, which introduce outliers. The identification and correction of outliers is important in ensuring the integrity of wind(More)
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(More)
A generic model of grid-connected doubly-fed induction generator (DFIG)-type wind turbines represented by differential-algebraic equations (DAE) is proposed for short-term transient-stability analysis. From the view of analytical research, vital simplifications are made to the complex physical model of DFIGs, whereas characteristic dynamics are still(More)