Method for controlling double-stage matrix converter-synchronous generator system

Abstract

The invention discloses a method for controlling a double-stage matrix converter-synchronous generator system. Closed-loop control is conducted on a unidirectional switch level voltage modulation ratio so as to automatically adjust the field current of a generator, when load power is small, the counter electromotive force amplitude of the generator is reduced to ensure that the system can normally work, the range of the load power is widened, and meanwhile a converter works in a good state, and the operating performance of the system is improved. According to the method for controlling the double-stage matrix converter-synchronous generator system, the control idea is simple, a hardware circuit does not need adding, and the method is of a great innovative significance and has high practical value.

Description

technical field [0001] The invention relates to a two-stage matrix converter-synchronous generator system, in particular to a novel control method for a two-stage matrix converter-synchronous generator system, which belongs to the field of matrix converters. Background technique [0002] Compared with the widely used AC-DC-AC converters in the industry, the matrix converter has the advantages of bidirectional energy flow, sinusoidal input and output current, controllable input power factor, compact structure and easy integration, etc., and has the title of "green converter". . Among them, the commutation control and clamping circuits of the two-stage matrix converter are relatively simple and easy to implement, and it is one of the most promising AC-AC converters at present. [0003] The power generation system structure composed of two-stage matrix converter and synchronous generator is as follows: figure 1 As shown, it includes load 1, LC filter 2, two-stage matrix conve...

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Problems solved by technology

The filter capacitor 22 produces capacitive reactive current. When the active power of the load is small, the power factor is small, then U Im is very small, if the motor back EMF u s Larger, the armature inductance 102 bears a larger pressure difference, so that the armature current is too large, if u is not reduced s amplitude, will limit the load power range

[0009] therefore, figure 2 In the control method shown, when the load is light, the system is prone to overcurrent faults and cannot operate normally.

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