A frequency conversion speed regulation control method for a three-phase five-arm power converter
A technology of a power converter and a control method, which is applied in the control system, AC motor control, conversion equipment for intermediate conversion to DC conversion, etc., can solve the problems of reducing the output power of the system, the safety of the system, and the failure of the system to operate normally. Achieve the effect of improving utilization and avoiding shutdown
Active Publication Date: 2017-12-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
When the power tube of a bridge arm in the topology is damaged, the entire system will not be able to operate normally, which has a major potential danger to the safety of the system
In addition, due to the lack of optimization of the modulation signal in the traditional solution, the utilization rate of the DC bus voltage is limited, thereby reducing the output power of the system
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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0018] In order to realize an effective power conversion control strategy, the present invention uses voltage-oriented control to calculate the given value of the rectified voltage according to the voltage and current collected by the sensor and the rotational speed of the motor; The given value; then according to the calculated voltage given value, calculate their respective zero-sequence compo...
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The invention provides a frequency conversion speed regulation control method of a three-phase five-arm power converter, the steps of which are: A. respectively measure the three-phase current grid voltage and the DC bus voltage on the rectification side through a current sensor, a voltage sensor and an encoder and the stator side current and rotor speed of the motor; B. Adopt voltage-oriented control on the rectifier side, and rotor flux linkage-oriented control on the inverter side, and calculate the three-phase voltage reference values on the rectifier and inverter sides respectively; C. Comparing the rectified three-phase voltage modulation waves, comparing the voltage modulation waves on the inverter side, and calculating their zero-sequence signals respectively; D. Injecting the respective zero-sequence components of the rectification and inverter sides into their three-phase voltage modulation waves; E. Add the modulation wave of the shared bridge arm on the rectification side to the three-phase modulation wave on the inverter side, and add the modulation wave of the shared bridge arm on the inverter side to the three-phase modulation wave on the rectification side to obtain the modulation signal of the five bridge arms. The invention is applicable to any rectification-controllable three-phase five-arm topology down-conversion speed regulation system.
Description
technical field [0001] The invention belongs to the technical field of frequency conversion speed regulation under medium and high power, and more specifically relates to a frequency conversion speed regulation control method of a three-phase five-arm power converter. Background technique [0002] In recent years, with the continuous development of power semiconductor devices and PWM control technology today, the AC-DC-AC converter can easily obtain energy from the three-phase AC grid and control the voltage and frequency of the AC side well. It has been widely used in frequency conversion speed regulation systems under medium and high power such as wind energy. [0003] In medium and high power frequency conversion speed regulation systems, the system generally adopts dual PWM control of PWM rectification and PWM inverter. This method has the advantages of adjustable power factor, low harmonic generation to the power grid, and high power utilization rate. However, due to t...
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IPC IPC(8): H02M5/44H02P27/08
Inventor 赵金周德洪李云华
Owner HUAZHONG UNIV OF SCI & TECH