2results about How to "Improve current quality" patented technology

This invention discloses a hybrid model predictive control method and device for a three-level energy storage converter. The method determines candidate voltage vectors based on voltage vector transformation rules; calculates the cost function value of each candidate voltage vector using a cost function; and selects the voltage vector corresponding to the minimum cost function value as the first... k The pre-optimal voltage vector for the first control cycle; based on the first... k The preliminary optimal voltage vector and midpoint voltage of the first control cycle are combined to determine the first control cycle. k The optimal voltage vector in the first control cycle; in the second... k Calculate the control cycle. k -1 and k The duty cycle of the optimal voltage vector is determined; the gate drive signal corresponding to the optimal voltage vector and its duration is applied to the power electronic semiconductor devices of the T-type three-level energy storage converter. This invention combines the advantages of intuitive and simple finite set model predictive control and high current quality of continuous set model predictive control, enabling current ripple attenuation and current quality optimization of the T-type three-level energy storage converter.

The present application relates to the technical field of light storage hybrid power generation control, and particularly to a multi-port light storage hybrid power generation modulation method and system based on current ripple suppression. The method comprises obtaining grid-side voltage and current data; determining a space vector sector according to a reference voltage vector of the grid-side voltage and current data; constructing a clamping sequence based on a reference sector of the space vector sector; establishing a current ripple model according to the clamping sequence and selecting a minimum ripple clamping sequence; deriving a double modulation wave of the minimum ripple clamping sequence based on a volt-second balance; and performing carrier comparison and driving output based on the double modulation wave. The present application systematically gives all clamping switch sequences and determines the influence type of the clamping switch sequences on system power, so that dynamic power regulation among photovoltaic units, energy storage units and loads of a multi-port light storage hybrid power generation system can be realized on the basis of reducing switch loss and improving system efficiency.