Photovoltaic controller parameters identification method step by step

Due to the photovoltaic and the relationship between the inner and outer ring of the controller is cascade in the primary side made short circuit to produce a voltage drop, or in the controller on the reference value, under the stimulus of step disturbance parameters not only identify the problems. For this, put forward the applied in secondary side measurement signal perturbation method, called virtual measurement incentive. Its outstanding advantage is applying a measurement signal incentive to block other measurement signal changes, which can realize decoupling controller action inside and outside the ring, and then solve the parameter identification problem. Based on this, puts forward a kind of photovoltaic inverter control parameters identification method step by step. This method first use of capacitance voltage measurement signal of the square wave and sine excitation, successively with the voltage loop integral and proportional coefficient; Then the shielding and node voltage and capacitor voltage measurement signal changing conditions, using current and branch q axis measurement signal sine excitation can determine the ratio of current inner loop three control parameters; By measuring or identification method of inductance parameter values, all can obtain the current inner loop control parameter values. If the inductance parameters can be measured, and the whole method do not need to use the optimization algorithm.
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