Variable-speed permanent-magnet alternator system and double-port voltage stabilization control method therefor

Abstract

The invention discloses a variable-speed permanent-magnet alternator system and a double-port voltage stabilization control method therefor. The system comprises a permanent-magnet alternator, a PWM (Pulse Width Modulation) rectifier, a DC filtering device and a controller, wherein the controller comprises a rotor position and rotational speed detection module, a DC voltage detection module, a DC current detection module, an AC voltage detection module, an AC current detection module, a coordinate transformation module, a first regulator, a second regulator, a current limit module and a PWM generating module. The method provided by the invention comprises the following steps: acquiring the position, the rotational speed, the DC voltage and current, and the AC voltage and current of the alternator rotor; and acquiring the quadrature-axis and direct-axis currents through coordinate transformation, so as to stabilize the DC and AC voltages for setting values and achieving amplitude limit to quadrature-axis and direct-axis currents generated by a target subjected to closed-loop control and generate PWM trigger pulses to control the PWM rectifier. By adopting the invention, double-port voltage stabilization of a DC and AC output terminal is maintained when the rotational speed of the alternator changes, the cost is low and the reliability is high.

Description

technical field [0001] The invention relates to the field of motors, in particular to a variable-speed permanent magnet alternator system and a dual-port voltage stabilization control method thereof. Background technique [0002] The permanent magnet alternator outputs an AC voltage, which is converted by a PWM rectifier to AC / DC (also known as ac / dc) and filtered by a DC filter device to obtain a controllable DC voltage to supply power to DC loads. The structure of a permanent magnet alternator system generally includes a permanent magnet alternator, a PWM rectifier, a DC filtering device, and a control system. [0003] Permanent magnet alternators use permanent magnets for excitation, the disadvantage of which is that the excitation cannot be adjusted. The prime mover drives the rotor of the permanent magnet alternator to rotate. Under the action of a constant excitation magnetic field, the rotational potential (also known as the generator potential or counter electromoti...

AI Technical Summary

Problems solved by technology

The withstand voltage level of the PWM rectifier device must be selected according to the AC output terminal voltage at the highest speed of the generator. Therefore, a high withstand voltage level must be selected when the generator works in a wide speed range, thereby greatly improving reduces device cost and reduces system reliability

At the same time, the greater the AC output voltage of the generator, the higher the insulation level requirements for the generator, which greatly increases the cost of the generator and even reduces the insulation life of the generator

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