Control method of voltage source off-grid inverter
A technology of voltage source type and control method, which is applied in the direction of converting irreversible DC power input into AC power output, electrical components, output power conversion devices, etc., which can solve the problems of poor power quality, small output current, and easy output voltage waveform. Distortion and other problems, to achieve the effect of high power quality
Active Publication Date: 2022-05-13
常州是为电子有限公司 +1
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[0002] At present, off-grid inverters are more and more widely used in production and life, and the load has higher and higher requirements for the power supply quality of off-grid inverters. During operation, due to the small output current, the control accuracy is reduced, and the output voltage waveform is prone to distortion, especially near the zero-crossing point of the output voltage, and the power quality is poor.
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[0027] In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.
[0028] figure 1 Shown is a typical single-phase H-bridge voltage source inverter; among them, the single-phase H-bridge voltage source inverter consists of four power switching devices Q1, Q2, Q3, Q4 to form an H-bridge topology, and the power switching device Q1 1. The power switching device Q2 forms a bridge arm, and the power switching device Q3 and the power switching device Q4 form another bridge arm. The control logic of the power switching devices on each bridge arm is complementary, and the power switching devices of the same bridge arm are turned on and off alternately. The output filter is composed of inductor L and capacitor C, and the DC input power is u dc , the inverter output voltage is u g , the inductor current is i L , the filt...
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The invention discloses a control method of a voltage source type off-grid inverter. The inverter includes an output filter, and the output filter includes an inductor. The steps of the method include: determining the forward peak reference current i of the inductor Lp_ref * and negative peak reference current i Ln_ref * ; where the output voltage of the inverter is referred to u g * and the output voltage value u g Input the voltage control loop, the output of the voltage control loop is the negative peak reference current i Ln_ref * ;Forward peak reference current i Lp_ref * =2*i o_ref -I neg ; where i o_ref =I o_amp *sinθ, I o_amp is the peak value of the output current under the rated power of the inverter, I neg is the negative current peak value of the inductor set under the rated power of the inverter, sinθ is the sine value of the inverter output voltage or current phase angle; the setting direction of the reference current in the positive half cycle of the inverter output current waveform and the negative The setting direction of the reference current in the half cycle is reversed. When it is running at light load or no load, it can effectively improve the power quality of the output inverter voltage by adopting the alternating control of positive and negative currents for the output filter inductor current.
Description
technical field [0001] The invention relates to a control method of a voltage source type off-grid inverter, relates to a power conversion technology in a power converter, and belongs to the technology in the field of power electronic equipment. Background technique [0002] At present, off-grid inverters are more and more widely used in production and life, and the load has higher and higher requirements for the power supply quality of off-grid inverters. During operation, due to the small output current, the control accuracy is reduced, and the output voltage waveform is prone to distortion, especially near the zero-crossing point of the output voltage, and the power quality is poor. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a control method for a voltage source off-grid inverter, which uses positive and negative currents for the output filter inductor current whe...
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IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0009
Inventor 赵海伟张玲玲李丹杨锡旺
Owner 常州是为电子有限公司