Three-level auxiliary inverter control method
A technology of three-level inverters and auxiliary inverters, which is applied in the direction of electrical components, AC power input conversion to DC power output, output power conversion devices, etc., and can solve the difficult problem of power density and harmonic characteristics Problems such as improvement and limitation of switching device loss characteristics, etc., to achieve more flexible setting of pulse number and frequency value, optimization of output waveform quality, and output waveform optimization
Active Publication Date: 2021-11-19
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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[0005]At present, the two-level inverter topology commonly used in subway auxiliary power supplies is difficult to achieve qualitative results in terms of power density and harmonic characteristics due to the limitation of switching device loss characteristics. promotion
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[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by 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.
[0049] The first embodiment of the present invention firstly provides a three-level inverter control system.
[0050] First, introduce the structure of the three-level auxiliary inverter, refer to figure 1 , the three-level auxiliary inverter includes:
[0051] Support capacitor: connected to the grid power input, providing DC power input for the three-level inverter, and playing the role of supporting and filtering the grid power input.
[0052] Three-level inverter: for inverting direct current into alternating current, I-shaped topology or T-shaped topology in...
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The invention provides a three-level auxiliary inverter control system and a three-level auxiliary inverter control method. The method comprises the following steps: sampling the output of a filter, and calculating active power and reactive power; performing power droop control based on the active power and the reactive power, and calculating an output voltage target value and a fundamental frequency target value; and performing coordinate transformation on the sampling value according to the fundamental wave frequency target value, performing decoupling calculation according to a coordinate transformation result and an output voltage target value to obtain a fundamental wave control component and a harmonic wave control component, and calculating a compensation modulation wave based on each control component. And based on the SVPWM principle, a PWM modulation signal of the three-level inversion unit is generated according to the compensation modulation wave. According to the invention, synchronous symmetry of any output fundamental frequency under any integer pulse can be realized, low-order harmonics are reduced, and output waveform quality is optimized.
Description
technical field [0001] The invention relates to the technical field of electrical control, in particular to a method for controlling a three-level auxiliary inverter. Background technique [0002] The auxiliary power supply provides AC power for loads such as air conditioners, air pumps, compressors, dynamic maps, TVs and lighting on rail vehicles. The requirements of large vehicle formation and high capacity make the load capacity increase continuously, and the auxiliary unit capacity also increases continuously; at the same time, due to the limitation of the axle load of the vehicle and the space limitation of the equipment under the vehicle, the total weight and volume of the auxiliary equipment are getting smaller and smaller, and the power is high. Auxiliary power supplies with small size and light weight and high power density have become a development trend. [0003] At the same time, considering that loads such as inverter air conditioners and dynamic maps often con...
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IPC IPC(8): H02M7/483H02M1/12
CPCH02M7/483H02M1/126
Inventor 曾凡飞吴强邸峰徐逸煌刘巍乔亚飞王媛媛
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST