Electric voltage safety monitoring method based on voltage stabilization field in partition load space

Abstract

The present invention relates to a method for monitoring the safety of the electric voltage basing on the voltage stabilizing filed on the partitioned load space, and belongs to the field for evaluating and controlling the online voltage. The method comprises the following steps: collecting the real-time data; mapping the busbar load space to the partitioned load space to realize the dimension reduction of the load space of the busbar; in the partitioned load space setting the increasing direction according to the load forecasting result, obtaining a collapse point along the direction, obtaining a load allowance index and boundary normal vector of the voltage stabilizing field, constructing a tangent plane as a partial approximation of the boundary of the voltage stabilizing filed; searching the nearest direction of the current operating point to the boundary of the voltage stabilizing field, calculating the minimum load allowance index and disclosing the voltage stabilization sensitive area; and if the load allowance is not sufficient, adjusting aiming at the sensitive area through the sensitivity calculating. The invention establishes a voltage stabilizing field in the partitioned load space and has the advantages of low space dimensionality, being easy to be described, confirming to the monitoring habit of the scheduling personnel, and facilitating the monitoring evaluationto the voltage stability and control decision.

Description

technical field The invention belongs to the field of on-line voltage safety evaluation and control, and relates to a voltage safety monitoring method based on a voltage stability domain on a partitioned load space. Background technique The online security assessment of the power system can help operators make correct judgments on the security status of the system and make correct decisions on the corresponding control measures, which is of great significance for maintaining the safe and stable operation of the power system and providing users with sufficient and high-quality power supply . The traditional safety analysis method is "point-by-point method", that is, simulation analysis or eigenvalue calculation for a given injection and fault form. "Point-by-point method" is a basic tool in power system analysis. However, since this method can only provide safety indicators for specified operating points and injection directions, point-by-point analysis alone cannot provide...

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Problems solved by technology

However, due to the high dimension of the full injection space of the power system, and considering that there are a large number of complex nonlinear links in the power system model, it is difficult to express the voltage stability domain in the high-dimensional injection space

In order to avoid the difficulty of high-dimensional nonlinear expression of the voltage stability domain in the full injection space, a voltage stability domain described by a hyperplane on the cut-set power space is proposed. It is customary to monitor and measure the stability margin through the tie line, but because the power vector on the cut set is not a variable that can be directly controlled in the system, it is difficult to use the voltage stability domain on the power space of the cut set to provide control decisions for the system. to the difficulty

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