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DC–DC converter, which is used to change and control voltage magnitude, is a really important part of the power electronic conditioning systems. Study of nonlinear dynamics and chaos in power electronics are becoming increasingly significant in the power quality and stability of distributed power generation systems. In this paper, the mechanisms that give rise to chaotic dynamical in the buck–boost...
According to the system characteristics of closed-loop dc-dc converter, a periodic switched affine systems model of the power regulator is established. Based on switched systems theories, an corresponding augmented periodic switched autonomous systems model is presented by augmentations of the state variables. Thus, the relatively simple transfer matrix multipliers of the augmented systems are used...
Splitting control is the last resort of security control. By splitting the whole system into several isolated islands, splitting control can ensure system stability and power supply under extremely emergency situation. In this paper, a mixed integer linear programming (MILP) based splitting strategy searching model is proposed. Connectivity constraints and voltage stability margin in each island are...
The rapid growth of new energy generation in China today is presenting new challenges for the stability of power grid. Based on the mechanism of voltage-inducting cascading trips of large-scale new energy in centralized system, this paper firstly proposes the definition of trip-off path to describe the detailed process of the failure, and builds the model of trip-off path searching and risk evaluation...
Online transient stability assessment (TSA) has always been a tough problem for power systems. One of the promising solutions is to extract hidden stability rules from historical data by machine learning algorithms. These algorithms have not been fully accommodated to TSA, since power system has its special characteristics. To ensure conservativeness of TSA, this paper proposes a synthetic stability...
In order to accurately calculate power systems available transfer capability (ATC), this paper proposes anew model including FACTS devices for calculating transfer capability with the "N-1" static stability margin constraints. Based on the teaching- learning-based algorithm (TLBO), an improved teaching-learning algorithm (ITLA) is put forward which is able to deal with complicated nonlinear...
Detecting the load currents is a basic control method of paralleled active power filter (PAPF). The stability and compensation effect of the system would be influenced by the interactions of the load, weak grid and the paralleled active power filter (PAPF), when the load can't be equivalent to an ideal harmonic current source. The impedance models are established to analyze the stability of the system,...
The interaction between STATCOM and voltage-source inverter (VSI) may cause instability in an islanded micro-grid. Impedance models of storage battery power convert system (PCS) and cascaded multilevel static synchronous compensator (STATCOM) are established based on which the interaction mechanism between PCS and STATCOM is studied. Using Nyquist stability criterion and admittance ratio analysis,...
This paper presents a new loss-of-field (LOF) protection scheme. Through theory analyses to generator and the power system in LOF event, three characteristics were found: 1) generator terminal voltage (GTV) decreases faster than the high side voltage of step-up transformer(HVSUT) does; 2) reactive power output of the generator (QO), GTV, HVSUT all decrease; 3) generator angle exceeds the static stability...
To assist dispatchers to on-line monitor small signal stability of power grid, this paper proposed an artificial intelligent method-Case-Based Reasoning(CBR) theory to predict small signal stability based on measurement data of wide area measurement system (WAMS). Oscillatory active power increment distribution (OAPID) was introduced to improve the prediction accuracy. The designing process of small...
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