Application of SPWM (Sinusoidal Pulse Width Modulation) control technique based on amplitude and frequency compression modulation to active power filtering

Abstract

The invention relates to the field of passive filters, particularly to an application of an SPWM (Sinusoidal Pulse Width Modulation) control technique based on amplitude and frequency compression modulation to active power filtering. A signal monitoring processor unit, a data processing controller unit, a multilevel inverter main loop, a mutual reactor, an access control main switch and an isolation break switch, wherein the data processing controller unit adopts an amplitude and frequency compression modulation algorithm and an SPWM technique. The invention has the advantages that when the technique is applied in the active power filtering design, the control on active power filtering is simplified, the operating stability, the maturity and the reliability of a product are improved, the voltage control accuracy is increased, the ripple coefficient of the outputted current is decreased, and an active power filtering product with high reliability and stability and high index can be quickly put into the user's power grid technology reformation market so as to achieve the effects of reducing wire loss, increasing the efficiency of reactive compensation, reducing the influence of harmonic waves on user loads and power grid systems, improving the power energy quality of users, and the like.

Description

technical field [0001] The invention relates to the field of passive filters, in particular to the application of an amplitude-frequency compression modulation SPWM control technology in power active filtering. Background technique [0002] With the rapid development of modern industry and civil electricity, electric energy has become one of the most important energy sources for human beings; the widespread application of nonlinear loads, a large number of The electrical characteristics lead to the continuous deterioration of the power quality of the grid system. [0003] Its inverters and inverters are high-efficiency equipment widely used in the fields of industrial speed regulation, transmission, and control. Due to the switching characteristics of the inverter circuits of inverters, inverters, and other equipment, for the grid system, It is a typical nonlinear load. When the grid system current flows through this type of load, it does not have a linear relationship wit...

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Problems solved by technology

[0008]2. Application, technical defects and existing problems

[0010]Compared with passive filters, the active filter has a better harmonic control effect. It can mainly filter out multiple and higher harmonics at the same time, without It will cause system resonance, but the stability, maturity and reliability of the product’s network operation are the main outstanding problems in the industry at present, and the price of the same product is relatively much higher; the current active filters are all Mainly low-voltage, high-voltage active filter technology has matured, but the actual application safety factor is very low

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