High-harmonic reactive compensation switching control method and device and computer equipment

Abstract

The embodiment of the invention discloses a high-harmonic reactive compensation switching control method and device and computer equipment. The method comprises the following steps: performing phase locking on hardware to obtain a phase-locked loop; acquiring a pulse signal of hardware; judging whether the pulse signal is a zero-crossing pulse signal or not; if the pulse signal is a zero-crossing pulse signal, acquiring an output angle of a phase-locked loop; judging whether the pulse signal is a real zero-crossing signal or not according to the output angle; and if the pulse signal is a real zero-crossing signal, carrying out signal detection and delay processing according to the pulse signal, and driving a relay to be put into control. By implementing the method provided by the embodiment of the invention, the zero-crossing judgment can be quickly completed with high precision, misjudgment is avoided, and the practicability is high.

Description

technical field [0001] The invention relates to a switch control method, more specifically to a high harmonic reactive power compensation switching control method, device and computer equipment. Background technique [0002] At present, in many power systems that use AC power supply, a large number of capacitors or inductance components are often used in the system circuit design. When the system is put into power supply, if the input AC voltage is large, it will be more affected. large current shock. In order to reduce the inrush current of capacitors and inductance components when the system circuit is powered on, it is necessary to accurately control the moment when the system circuit is powered on, so that it can be connected to the AC power supply when the AC voltage crosses zero, so as to reduce the impact of the power supply on the system circuit. shock. [0003] In order to control the system circuit to connect to the external AC power supply when the AC voltage cr...

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Problems solved by technology

[0004] High-order harmonics are likely to cause multiple signals during hardware zero-crossing detection, which is prone to misjudgment problems; the current zero-crossing switching feedback method mainly processes voltage feedback and current feedback. Parameters such as the size of the AC current, the transmission ratio of the optocoupler, and the degree of linearity affect the zero-crossing pulse width. It has a relatively large impact on the accuracy, and it is difficult to adapt to the power environment where the 3rd to 7th harmonics are mainly generated by the rectification and inverter; the voltage feedback method uses the voltage stabilization method to limit the zero-crossing voltage amplitude, so as to control the zero-crossing pulse width and zero-crossing comparison It solves the influence of the 3rd, 5th, and 7th harmonics on the zero-crossing pulse width, but it is difficult to adapt to the pollution of the power grid caused by the high-frequency harmonics above 25th due to the access of new energy such as photovoltaic power generation, and it is easy to generate false pulses , leading to misjudgment

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