A wind power generation method based on a novel current compensation algorithm and a control thereof

Abstract

The invention discloses a wind power generation method based on a novel current compensation algorithm, comprising the following steps: S1 building a boost topology structure and a hardware circuit, wherein the hardware circuit comprises an MCU; S2 assuming that the inductor current works in DCM mode, calculating the average input current I of the fan from the average formula of the triangular wave current and the inductor theory; S3, controlling the MCU to output a suitable PWM wave, driving the MOS transistor to make the inductor work in the chopping state, subtracting the signal delay, andrecording the PWM duty cycle Ton at this time; S4, collecting the input voltage of a fan and the voltage of accumulator; S5, compensating the inductance properly; S6 bringing the results of the stepsS3, S4 and S5 into the formula 5, and calculating the value of I; S7 bringing the calculated I value into MPPT algorithm to realize wind power generation. The current measuring range and the precisionobtained by the invention can be improved by one order of magnitude, the method is especially suitable for sampling compensation of small current, and the method has good applicability and low cost.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a new current compensation algorithm wind power generation method and a controller thereof. Background technique [0002] Wind turbines must be equipped with a wind turbine controller in order to complete energy collection and safe operation management of wind turbines. In order to improve the power generation efficiency of wind turbines, MPPT (maximum power tracking) technology is generally used to improve the power generation effect of wind turbines. When executing the MPPT algorithm, it is generally necessary to collect data such as the input voltage, input current, and rotational speed of the fan to complete. The input voltage and rotational speed have relatively large amplitudes due to the variation range, which is relatively easy to acquire and the acquisition accuracy is also high; for the input current, it is not so simple, because the current acquisition is generall...

AI Technical Summary

Problems solved by technology

This method can improve the accuracy of small signals, but the superimposed signal needs to be subtracted and compensated before use (usually digitalized by single-chip A / D). Since the operational amplifier is relatively sensitive to temperature, the compensation amount is also different for different temperatures. It will be different. Due to the signal drift caused by temperature, sometimes the detection is not worth the loss, so this method is rarely used when the current signal is small.

[0004] The purpose of the MPPT algorithm is to increase the power generation of the fan and let the fan work at the maximum power tracking point. Therefore, it is necessary to collect the input power of the fan. Since power = voltage * current, if the current sampling is not accurate, the tracked fan will always be In the stall state, the actual output power will be less than the optimal power. If it is serious, the phenomenon of fan stall operation will be aggravated. Since the MPPT algorithm is implemented in the PWM mode on the hardware, the PWM mode is the pulse width modulation mode. For the fan, the PWM modulation component is the input load of the fan. Due to the inaccurate measurement of the sampling current information, the given fan load is too large or too small.

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