Distribution network voltage detection algorithm

Abstract

The invention provides a distribution network voltage detection algorithm. The distribution network voltage detection algorithm specifically comprises the following steps: transforming three-phase voltages Ua, Ub and Uc from an abc coordinate system to a dq0 coordinate system; Assuming that the effective value of the A-phase fundamental wave voltage is U0; wherein the initial phase angle of the fundamental wave voltage is shown in the specification, and the effective value of the n-order harmonic voltage is Un, and the effective value of the n-order harmonic voltage is shown in the specification. wherein the initial phase angle of the n-order harmonic voltage is shown in the specification, and the n-order harmonic voltage is obtained after dq conversion is conducted on the initial phase angle, converting The voltage fundamental wave positive sequence component into a direct current component, and then obtaining an effective value and an initial phase angle of fundamental wave voltage.According to the invention, a voltage dq conversion detection algorithm is used for converting a three-phase voltage Ua into a three-phase voltage Ub; According to the method, the abc coordinate system is converted into the dq0 coordinate system, the voltage fundamental wave positive sequence component in the system can be obtained as long as the voltage direct current component in the dq0 coordinate system is extracted, the calculation process is not affected by the voltage harmonic component in the system, and the voltage value of the system can be rapidly detected without time delay.

Description

technical field [0001] The invention belongs to the technical field of voltage detection, in particular to a distribution network voltage detection algorithm. Background technique [0002] The impact of low distribution network voltage on the safe and economical operation of the power supply system mainly includes the following aspects: 1) Increased line loss. When a certain power of electric energy is transmitted, the voltage of the distribution network decreases, and the current increases accordingly, which will cause an increase in line loss. 2) Reduce the stability of the power system. As the distribution network voltage is reduced, the transmission power limit of the line is reduced, thereby reducing the stability of the power system, and voltage collapse accidents may occur if the voltage is too low. 3) Generator output is reduced. If the distribution network voltage drops by more than 5%, the output of the generator will also be reduced accordingly, and the corresp...

AI Technical Summary

Problems solved by technology

When a certain power is transmitted, the voltage of the distribution network decreases, and the current increases accordingly, which will cause an increase in line loss

2) Reduce the stability of the power system

Due to the reduction of the distribution network voltage, the transmission power limit of the line is reduced, thereby reducing the stability of the power system, and voltage collapse accidents may occur if the voltage is too low

3) Reduced generator output

The normal voltage of the transformer should not exceed 5% of the rated voltage. If the voltage is too high, the iron core will be overexcited and the iron core will be seriously saturated. The iron core and its metal clamps will generate high temperature due to the increase of magnetic flux leakage. In severe cases, the insulation of the transformer will be damaged. And make the component deform locally, shorten the service life of the transformer

2) Damage to electrical equipment

All electrical equipment in the power system has a withstand voltage value. When the voltage is high for a long time, the electrical equipment will heat up severely, the insulation will be damaged, and in severe cases, the electrical equipment will be damaged, causing the equipment to fail to work normally.

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