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Based on the power system's stability and control theory, the paper carries out intelligence stability analysis of power system with big data technology. With big data and data mining technology, the paper takes advantage of the useful information from massive data, and makes out the corresponding security and stability of power system intelligent analysis and decision making through the intelligent...
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...
Splitting control is regarded as the last defensive line of emergency control in power system to isolate the asynchronous generator groups. Traditional splitting control method, mainly based on principles of relay protection, is a kind of passive, component-level, local, control strategy. In contrast, active splitting control is proposed to realize coordination of decentralized operation of splitting...
The shortcomings of current area control error strategy are analyzed. In this paper, a dynamic ACE strategy based on the characteristics of large receiving-end grid is proposed. It also considers security and stability problem during the period when the power system executing dynamic ACE. Calculation formulae and physical meaning of dynamic ACE are analyzed. And the evaluation criteria of dynamic...
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,...
On the tie-line of interconnected power systems, there inevitably exist power fluctuations. Overlarge undulations on tie-lines threaten the stability and security of the system. It is remarkable that when the control areas are larger, the situation becomes more austere. In this paper, based on the practical data of two large interconnected power systems, the stochastic power fluctuations of the tie-line,...
With the rapid development of energy storage technology, applying the large-scale energy storage to increase the penetration of new energy with intermittent nature has been drawing worldwide attention. Among the field of energy storage applications, the management and control strategy research is the key technology, and also plays an important role in smart grid study. In this paper, the concept of...
This paper is aimed at the proposal of a structure for the comprehensive platform for analysis and warning of power grid. The emphasis is placed on the illustrating the function and structure, as well as the algorithm of the platform. The platform can integrate the dispatching systems widely used, including EMS, OMS, Scheduling Plan System, Lightning Location System, Waterpower Scheduling Automation...
The widespread application of FACTS will be an obvious tendency with the development of power system, as FACTS have the ability to optimize power flow, reduce the network loss, increase power system damping, improve voltage stability and so on. Therefore , there is particular urgent needs to study the coordinated control of the multiple FACTS in the system. This article uses the robust control method...
Primary frequency regulation plays a significant role in power system frequency control. As a result of the separation of plant and grid, it becomes necessary for the grid to monitor the primary frequency performance of generators. This paper designs an online evaluation system of primary frequency regulation based on WAMS. Firstly, the evaluation indices system is proposed, which assesses the primary...
Voltage stability is a crucial factor in power system operation. When bus voltage exceeds the operation limits because of change of the operation mode, load in the network or the environmental factors, appropriate control actions should be taken to guarantee a secure system operation, avoiding emergency situations or voltage collapse. Development and improvement of the algorithm for voltage security...
After a large disturbance, a hydropower group connected to the main system through a long distance line, may split from the system and operate isolated. Based on the actual cases of MAO XIAN and JIU SHI YA hydropower groups in Sichuan province of China, the over-voltage problem in the isolated networks are presented. The feasibility of balancing the excessive charging power by generator's leading...
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...
F there does not have enough support as a means of reactive power sources, the modern power system voltage instability will occur. Beijing-Tianjin-Tangshan Power Grid is load center in North China, the region's power supply relies heavily on its long-distance and heavy-load interconnection of other power grids. At the same time the region does not have sufficient dynamic reactive power support, so...
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...
The dynamic security region (DSR) of bulk power system has been accepted more and more in recent years for providing plenty of security information and good prospect in online application. This paper compares three linear approximations for the dynamic security region of network-reduction power systems. The three linear approximations are the Q-linear approximation based on the quadratic approximation...
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