A method for calculating the critical point of static voltage stability of power system

A static voltage stabilization and power system technology, applied in the direction of power network operating system integration, information technology support system, AC network voltage adjustment, etc.

Active Publication Date: 2019-01-08
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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Problems solved by technology

[0004] The invention provides a calculation method for the static voltage stability critical point of the power system, which solves the technical problem that the power flow at the static voltage stability critical point cannot be solved due to the singularity of the Jacobian matrix
By introducing the AQ node, the method makes the Jacobian matrix still have good non-singularity even at the point of static voltage instability, and is not limited by the number of system nodes, and can accurately calculate the critical point of static voltage stability of the system , so as to more efficiently solve the problem that the singularity of the Jacobian matrix leads to the unsolvable problem of the power flow at the critical point of static voltage stability

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  • A method for calculating the critical point of static voltage stability of power system
  • A method for calculating the critical point of static voltage stability of power system
  • A method for calculating the critical point of static voltage stability of power system

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Embodiment

[0057] A method for calculating the static voltage stability critical point of a power system, the analysis steps comprising

[0058] 1. In this embodiment, the actual equivalent power grid calculation example of 220kV in Taiyuan is analyzed:

[0059] The simulation software is matlab, and the system wiring diagram is as follows: figure 1 As shown, node 2 is a 3×200MW unit, node 3 is a 4×300MW unit, node 15 is a 600MW unit, and the average total active and reactive loads of the system are 1383MW and 453MVar respectively;

[0060] In the basic operation mode of the system, calculate the initial power flow P 0 , initial voltage U 0 , power factor cosφ i equal to the initial amount;

[0061] 2. Gradually increase the system load, and use the classic cow-pull method to calculate until the system power flow does not converge to the system average load level, increase the load of node 1, node 4, node 11 and node 14, and increase the load of generator sets 2, 3, and 15 at the sam...

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Abstract

The invention discloses a calculation method of a static voltage stability critical point of a power system, which solves the problem that the power flow at the static voltage stability critical pointis unsolvable due to the singularity of a Jacobian matrix. The main steps include: calculating the basic power flow, increasing the node load until the classical Nulla method does not converge, usingthe AQ node method to calculate the critical point of the static voltage stability of the system and so on. By introducing a new node type-AQ node into static voltage stability analysis, this methodimproves the traditional continuous power flow analysis method which needs to be corrected repeatedly to obtain the critical point of static voltage stability, This method can cause 'deflection' of matrix singular points at the critical point of static voltage stability, eliminate the singularity of Jacobian matrix completely and obtain the critical point of static voltage stability quickly and accurately, because it takes a long time and may not converge in the correction process and calculation processes are complex.

Description

technical field [0001] The invention relates to the technical field of static voltage stability analysis of a power system main network, in particular to a calculation method for a static voltage stability critical point of a power system. Background technique [0002] With the rapid development of the global economy and the increasing load of electricity, the operation of the power system is getting closer to its limit state. Existing research results show that static voltage stability plays an important role in many blackouts that have caused huge economic losses and seriously affected people's lives and industrial production in recent years. Incentives for development; in order to prevent the frequent collapse of the entire grid caused by voltage instability, electric power researchers have done a lot of research, trying to find the voltage instability point of the power system, and calculate the distance from the current operating state of the power grid to the instabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14H02J3/06
CPCH02J3/06H02J3/14Y04S20/222Y02B70/3225
Inventor 张谦郑惠萍刘新元白杨王金浩曲莹马东娟薛敏
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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