A method for controlling reactive power and voltage of regional power grid

Abstract

The invention discloses a regional power grid reactive voltage control method, and the method comprises the steps as follows: S1, building the power grid topology network covering all power substations in the whole network; S2, real time collecting power grid real time data in regional power grid and extracting effective real time data; S3, calculating and analyzing the effective real time data, obtaining more than one control strategy for realizing reserve area power grid reactive voltage control target by capacitor switching or transformer gear adjusting operation, generating the control strategy set; S4, combining the power grid topology network, selecting optimum control strategy with least operation step to the capacitor or transformer; S5, judging the optimum control strategy; when the optimum control strategy is right, generating power grid remote control command, when the optimum control strategy is wrong, returning to the step S3; S6, realizing reactive voltage control target according to the power grid remote control command and returning to the step S2. The regional power grid reactive voltage control method can have reactive control for regional power grid and have smallest power loss.

Description

Technical field [0001] The invention relates to the technical field of electric power automation, in particular to a method for controlling reactive power and voltage of a regional power grid. Background technique [0002] Voltage stability can ensure the normal operation of various electrical equipment and prolong their service life. With the increasing requirements of users for power supply quality, the voltage qualification rate has become a major concern for them. For economic considerations, it is not possible to transmit reactive power over long distances in the power grid, so as to avoid energy loss caused by long-distance transmission of reactive power. At the same time, voltage and reactive power control is a problem related to ensuring the quality of power supply, satisfying users’ reactive power requirements, and system voltage qualification. It is also an effective measure to reduce network losses and improve the economics of grid operation. Closely. Therefore, real...

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Problems solved by technology

This kind of substation-level voltage and reactive power local optimization comprehensive control technology is relatively mature, but there are still the following deficiencies: 1. Only local optimization can be realized, and the optimal control of the whole system cannot be realized, and only the controlled bus voltage can be guaranteed. Qualified, can not achieve the goal of the minimum power loss of the whole network; 2. Frequent voltage adjustments will occur in the secondary on-load voltage regulation grid, which will easily cause unreasonable voltage regulation, and the ability to adjust the mid-terminal voltage of the three-winding transformer is insufficient; 3. , The regulation and control of the VQC device is based on the given upper and lower limits of voltage and reactive power. The determination of the upper and lower limits of voltage and reactive power depends on the experience of maintenance personnel. There is a lack of an effective calculation method. If the upper and lower limits are unreasonable, No matter how perfect the adjustment measures are, it is impossible to get reasonable control; Fourth, each substation needs to invest in VQC devices, which will also increase the equipment investment of power supply companies

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