Intelligent cooperative control system of multi-unit permanent magnet synchronous motor and method thereof

Abstract

The invention, which belongs to the technical field of the power electronics and electrical drives, provides an intelligent cooperative control system of a multi-unit permanent magnet synchronous motor and a method thereof. According to the invention, a structure of parallel connection of low-voltage multiple permanent magnet motor cooperative control units is employed to realize low-voltage, high-power, low-speed, large-torque control and system redundancy control. On the basis of the dual-parallel PWM rectification circuit structure, when the system is in an unbalanced power supply network environment, two groups of PWM rectifiers are respectively used for controlling positive-sequence and negative-sequence currents, thereby reducing the reactive loss and the harmonic loss. An inverter unit uses a resonance pole type three-phase soft switch inversion circuit, so that the utilization rate of the direct-current bus voltage is improved and the switching loss of the device in a high-frequency state can be substantially reduced. In terms of permanent magnet motor control, a current control and speed estimation unit is used for estimating velocity and phase angle information of a rotor accurately, and the cost is low and reliability is high. The controlled object is a multi-unit permanent magnet synchronous motor, so that problems of difficult motor installation, transport and maintenance for the high-power electrical transmission system can be solved.

Description

technical field [0001] The invention belongs to the technical field of power electronics and electric transmission, and in particular relates to a multi-unit permanent magnet synchronous motor intelligent cooperative control system and method. Background technique [0002] High-power electric drive systems play an important role in industrial production and are widely used in large-scale mine hoisting, large-scale ship main propulsion, and megawatt-level wind power generation. At present, there are many problems in the existing high-power electric transmission system, mainly as follows: in terms of system structure, high-power electric transmission system mostly adopts a single branch structure, high voltage level, no redundancy in the system, and low reliability. In terms of rectification, the rectification part of the system mostly adopts the uncontrollable rectification mode, the power factor is low, and there is a large reactive power transmission loss. In the unbalanced...

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention proposes a multi-unit permanent magnet synchronous motor intelligent cooperative control system and method to solve the problems of energy loss and reactive power loss of hard switching circuits in high-power electric transmission systems, and to solve the problems of multi-unit coordinated control and Fault-tolerant control problems, solve the difficult problems of motor installation, transportation and maintenance, realize the optimization of the overall energy, and achieve the purpose of improving the utilization efficiency of electric energy

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