Wireless parallel control method of 400 Hz high-power inverted power supply and control system thereof

Abstract

The invention relates to a wireless parallel control method of a 400 Hz high-power inverted power supply, utilizing the integral value of active power P and reactive power Q to regulate the phase and the amplitude of the output voltage of each inverter in a plurality of inverted power supply parallel systems so as to equally distribute loads. A control system applying the control method at least comprises a 400 Hz inverted power supply module comprising an inverter (11), a pulse-width modulation (PWM) driving circuit (21) for driving the inverter (11), a series inductor (201) positioned at the output side of the inverter (11), an output phase detecting circuit (301) positioned on a public bus end, an output voltage detector (12) positioned on the output end of the inverter, and a load current detector (13) and a control unit (22) which are connected to the output end of the inverter in series. The output end of the inverter is connected with one parallel inductor in series and is connected to a public bus through a parallel switch; and the control unit realizes the control on the inverter through an operational control algorithm.

Description

technical field [0001] The invention relates to a power supply control method with a three-phase 400Hz inverter as the core, in particular to a method and a control system for wireless parallel operation of three-phase inverter power supplies. Background technique [0002] With the development of power electronics technology and switching devices, power inverter technology has been widely used. The function of the inverter is to convert direct current into alternating current. The core part of power electronic devices such as frequency converters for AC motor speed regulation and uninterruptible power supplies are inverters. With the increase of electrical equipment, many occasions require parallel operation of multiple inverters to form a parallel system. The 400Hz high-power inverter power supply is the core of the airport ground static variable power supply. It is responsible for the task of supplying power to the aircraft at the airport and the maintenance station, and ...

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Problems solved by technology

The method proposed in U.S. Patent 6356471 can only limit the output voltage amplitude, and cannot solve the phase synchronization problem in parallel connection. Patent No. 200710020964.2 is a wireless parallel connection method, but its phase adjustment error is 50μs, which is suitable for 50Hz inverter The parallel connection of inverters will cause a large circulating current in the parallel operation of 400Hz inverters. 200720047980.6 is a method of wired parallel connection that relies on average current detection, which will reduce the reliability and redundancy of the parallel system. The method of 200810074029.9 It is also a wireless parallel method based on droop theory, but it can only reduce the circulating current to a certain extent, and cannot share the load current equally, so it is suitable for low power occasions

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