A Current Predictive Control Method for Single-phase Inverter with Harmonic Reduction
A technology of a single-phase inverter and control method, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., which can solve the problems affecting production safety, poor motor operation effect, property loss, etc. problems, to achieve the effect of improving quality, reducing harmonics, and reducing THD
Active Publication Date: 2019-07-23
XIAMEN UNIV +1
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Problems solved by technology
Excessive THD will bring a series of negative effects, such as the deterioration of the operation effect of the motor and the increase of the operating cost of the power grid, etc.
What's more serious, excessively high THD will even affect production safety and lead to property loss if left untreated
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[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0043] refer to figure 1 , the single-phase inverter is connected to the reverse electromotive force Ug through a filter connected in series with a resistor R and an inductor L;
[0044] The voltage at the DC terminal of a single-phase inverter is denoted as V dc , the fundamental frequency of the grid is f 0 =50Hz, the synchronous speed is defined as ω 0 =2×πf 0 rad / s, the sampling frequency is f s , the sampling time is T s , the number of sampling points of one cycle is N, then there is T s =1 / f s , N=f s / 50;
[0045] The output current of the single-phase inverter is i, and the reference value of the output current of the single-phase inverter is i * , is the standard fundamental sinusoidal signal; the output current of the single-phase inverter has three states: when the power switching elements S1 and S4 are turned on, and S2 ...
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The present invention provides a single-phase inverter current prediction control method for reducing harmonic waves. The method comprises the steps of: collecting an actual value of an output current, and according to the actual value, predicting output current values in different states at the next sampling moment; designing an iteration method to calculate average values, fundamental wave instantaneous values and THD (Total Harmonic Distortion) values of continuous one-cycle output currents in different prediction values, performing linear combination of absolute values of the average values of the output currents, absolute values of differences of the fundamental wave instantaneous values and a reference current and the THD values as an optimization function, and employing a traversingmethod to determine a state of the minimum of the function as output of the controller to achieve single-phase inverter model prediction control by taking reduction of the harmonic waves as a purpose.
Description
technical field [0001] The invention belongs to the technical field of converter control, and in particular relates to a current prediction control method for a single-phase inverter for the purpose of reducing harmonics. Background technique [0002] The inverter outputs AC current by controlling the on-off of the switch element, so as to realize the conversion of electric energy from DC to AC. In recent years, with the increase in demand for high-precision motor drives and new energy grid-connected, inverters are required to provide higher-quality AC current. Total Harmonic Distortion (THD) is the main index to evaluate whether the quality of AC current is up to standard. The lower the THD, the better the quality of the AC current. Excessive THD will bring a series of negative effects, such as the deterioration of the operation effect of the motor and the increase of the operation cost of the power grid. What's more serious, excessively high THD will even affect product...
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IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 李钷冯海锋李睿煜张景瑞关明杰
Owner XIAMEN UNIV