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Power grid reactive compensation method based on ip-iq method and phase-controlled switching technology

An ip-iq, switching capacitor technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, electrical components, etc., can solve problems such as measurement errors, reduce system investment, improve power quality and reliability , the effect of eliminating high-frequency interference

Active Publication Date: 2018-05-18
FUZHOU UNIV
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Problems solved by technology

Because the p-q method does not consider the zero-sequence component in the modeling, there is a large error in the measurement of the three-phase unbalanced system, so it can only be applied to the harmonic detection of the three-phase balanced system

Method used

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  • Power grid reactive compensation method based on ip-iq method and phase-controlled switching technology
  • Power grid reactive compensation method based on ip-iq method and phase-controlled switching technology
  • Power grid reactive compensation method based on ip-iq method and phase-controlled switching technology

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Embodiment Construction

[0046] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0047] The invention provides a method for reactive power compensation of a power grid based on the ip-iq method and phase control switching technology, which uses the ip-iq method to detect the reactive current of the power system in real time, performs remote control according to the real-time data, and performs opening and closing actions Switching on and off of the capacitor bank, or issuing control commands on the spot, to achieve zero current input and zero voltage cut-off; it includes the following steps: Step S1: ip-iq method to detect the reactive current in the power grid in real time; Step S2: Use digital filtering technology to carry out Signal zero-crossing point extraction; Step S3: Receive the zero-point signal through a phase controller, and perform opening and closing actions to switch the capacitor bank, so as to realize zero c...

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Abstract

The invention provides a power grid reactive compensation method based on ip-iq method and phase-controlled switching technology. The power grid reactive compensation method includes step S1, detecting reactive current in a power grid in real time by the ip-iq method; step S2 performing signal zero-crossing point extraction by adopting a digital filtering technology; S3, receiving a zero-crossingpoint signal through a phase controller, using switch on / off action to switch a capacitor bank to realize zero-current input and zero-voltage cutting. According to the method, reactive current of thesystem is detected by adopting the method, and the method is also applicable under the condition of system voltage distortion and asymmetry. By adopting digital filtering, high-frequency interferencecan be effectively eliminated, and the alternating-current signals collected by the system are subjected to filtering processing. Noise and temperature drift can be avoided, and the requirement for the phase characteristics of the filter can be met. The signal zero-crossing point in the power grid performs switching action, the electric energy quality and reliability of the system can be improved,the electric power system can be simplified, and the system investment is reduced.

Description

technical field [0001] The invention belongs to the field of electric energy quality and reactive power compensation, and in particular relates to a method for reactive power compensation of a power grid based on an ip-iq method and a phase control switching technology. Background technique [0002] In recent years, non-linear loads (power electronic devices) have been increasingly used in power supply systems, and a large number of reactive power and harmonics have entered the power grid, seriously affecting power quality problems, such as voltage flicker, frequency changes, etc., which have greatly affected The normal use and safe operation of electrical equipment. There are a large number of resistive and inductive loads in coal mining enterprises. During normal work, resistive and inductive loads absorb reactive power in the grid. The generator can provide a certain amount of reactive power, but it is unreasonable to often transmit it over long distances. It must be cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1821Y02E40/30
Inventor 金涛李强广李泽文苏文聪
Owner FUZHOU UNIV
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