Instant power direct control method for stator duplex winding asynchronous machine power generation system

Abstract

This invention relates to a direct control method for instant power of a generation system of a stator-double winding asynchronous motor, in which, the system includes a stator-double-winding asynchronous generator, a filter inductor, a power converter, a commutating bridge, a excitation capacitor, a storage battery, a diode, a current sensor, three voltage sensors, a digital signal processor and a drive circuit and gets rid of a rotation speed sensor and a current closed loop circuit, and the method includes: taking controlling the instant power of a winding as the direct control object and limiting it in a given error sphere by optimizing selection of voltage vectors so as to output constant voltage.

Description

technical field [0001] The invention relates to a voltage control method of a stator double-winding asynchronous motor power generation system based on direct control of instantaneous power of control windings. Background technique [0002] The squirrel-cage asynchronous motor power generation system based on power electronics and modern control technology has continuously adjustable excitation reactive power, and the power quality of the power generation system has been greatly improved. In addition, the generator itself has many advantages such as simple structure, convenient maintenance, and high reliability. The system has gradually become a hotspot in the research and application of new energy power generation systems such as small hydropower and wind power, and independent power systems such as aircraft and electric vehicles. However, this type of generator also has shortcomings: when the converter is connected in series between the three-phase asynchronous motor and t...

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Problems solved by technology

However, this type of generator also has shortcomings: when the converter is connected in series between the three-phase asynchronous motor and the load, the required converter capacity is large, and the switching harmonics of the converter are easily injected into the load; When it is connected in parallel with the load at the generator end, the isolation inductance required is relatively large, and the output voltage quality of the generator is greatly affected by the size and nature of the load

For the latter, due to the coupling of each phase of the control winding, although the decoupled command current value is obtained by the outer voltage loop, after passing through the hysteresis controller of the current inner loop, the switching signal finally applied to the converter is also Incorporates the coupling information between phases and phases, which affects the control performance

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