METHOD FOR CONTROLLING NONLINEAR DYNAMIC PROCESSES IN SINGLE-PHASE VOLTAGE INVERTERS WITH SINUSOIDAL BIPOLAR REVERSE MODULATION Russian patent published in 2021 - IPC H02M7/53 

FIELD: converter technology.

SUBSTANCE: claimed invention relates to converter technology; it can be used in the implementation of digital control systems for single-phase inverters with sinusoidal pulse-width modulation. An algorithm for controlling nonlinear dynamics is proposed. The control pulses to the keys of the power part, consisting of a bridge inverter and an L-shaped LC filter, are supplied by a control system that includes two subsystems. The main subsystem is a standard automatic deviation control system that consists of an error calculator that calculates the difference between the task signal and the feedback signal, a feedback amplifier with a given coefficient, a regulator that amplifies the error signal with a given coefficient, the adder to one of the inputs of which a signal is sent after the controller, and to the second input of which a signal from the auxiliary control system for dynamic processes is sent, a sampling-storage device that captures the control signal at discrete times, the output signal of which is fed to the comparator, which compares this signal with the unfolding voltage coming from a specialized generator, and generates control pulses with power keys, which allows providing a high-quality sinusoidal output voltage in a wide range of variations in system parameters. The second subsystem is a control system for nonlinear dynamic processes. When calculating corrective actions at discrete moments in the control system for nonlinear dynamic processes, the values of phase variables at discrete moments in the previous period of the low-frequency process are used. Subtracting from them using subtractors of state variables at discrete moments in the current period of the low-frequency process, recorded by sampling-storage devices and scaled with specified coefficients, forms a residual vector, the components of which are multiplied by the specified coefficients. Then, the components of the residual vector are fed to the adder of the main control subsystem, which allows one to influence the error signal and ensure the stability of the required dynamic mode. The technical implementation of the proposed control system does not require the use of expensive high-performance microcontrollers and can be implemented by slightly modifying the circuit of a standard device.

EFFECT: invention is aimed at eliminating dangerous fluctuations in the output voltage that occur with a certain set of system parameters.

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