Controlling system and controlling method for IGBT type cascade speed control system active power filter

Abstract

The invention discloses a controlling system for an IGBT type cascade speed control system active power filter. The controlling system for the IGBT type cascade speed control system active power filter comprises a mathematical model building unit, a linearization unit, a variable structure controlling unit and a controlling signal output unit, wherein the mathematical model building unit is used for building mathematical models of an inverter in a three-term stationary coordinate system and carrying out Park conversion to change the mathematical models into the mathematical models in a dq0 coordinate system; the linearization unit is used for carrying out accurate state feedback linearization on the mathematical models in the dq0 coordinate system; the variable structure controlling unit is used for designing the control law of inverter alternating current side current components in an index reaching law method, and a final system controlling input quantity is obtained; the controlling signal output unit is used for obtaining the driving controlling signals of the inverter after the input quantity is controlled by the system, and Park inverse transformation and sine pulse width modulation are conducted on the input quantity. The controlling system is simple in design and strong in robustness, when parameters of the system are disturbed internally or disturbed by external factors, the controlling system still can effectively restrain the non-power-frequency components, and the motor rotation speed adjusting effect is good.

Description

Technical field [0001] The invention relates to a controller design of an inverter of a winding asynchronous motor cascade speed regulation system, and belongs to the field of motor speed regulation and energy-saving device design. Background technique [0002] The shortage of power resources in our country, energy conservation has a profound impact on the development of the national economy. Fans and pumps are widely used in various industrial and mining enterprises, have a wide distribution, and consume huge amounts of power. However, their own speed regulation range is not large and the system dynamic performance is not high. Among the many speed regulating devices, the rotor-side cascade speed regulating system has become a kind of speed regulating device with higher cost performance in winding motors because of its high reliability and low cost. [0003] Now commonly used in the industry is the thyristor cascade speed regulation system with chopper. The inverter of this kind...

AI Technical Summary

Problems solved by technology

The inverter of this speed control system adopts the thyristor phase control method, and the purpose of speed control is realized by adjusting the duty cycle of the chopper. The disadvantage of this system is that the power factor is not high, and the inverter returning to the stator side In essence, the current is still a rectangular wave with a width of 120°, which contains a large number of harmonics; at the same time, because the rectifier side is an uncontrollable rectifier, the motor rotor side also contains inter-harmonic components. Through the coupling effect of the motor's own magnetic field, it will also Affects the current waveform on the stator side

Some people use IGBT inverters instead of thyristor inverters, and through SPWM or SVPWM modulation technology, the sinusoidalization of the current fed back from the inverter transformer to the stator side is realized, which greatly reduces the harmonic content of the incoming current, but few people Considering those non-power frequency components that the rotor is coupled to the stator side, the cascade speed control system will still bring pollution to the power grid

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