6 results about "H bridge inverter" patented technology

The present application relates to power supply circuit device system technical field, especially to a kind of single-phase inverter system based on battery pack and bidirectional switch bridge arm, left half bridge of traditional H bridge inverter is replaced by first battery pack and second battery pack series connection, right half bridge then adopts first bidirectional switch and second bidirectional switch to constitute.Wherein, first battery pack as upper bridge arm, second battery pack as lower bridge arm.In inverter mode, by controlling the access quantity of single battery unit in left half bridge to generate ladder wave to approximate positive half cycle or negative half cycle of sine wave, simultaneously cooperate with the power frequency commutation of right half bridge bidirectional switch, i.e., can be synthesized ac voltage at output end, without complex PWM modulation and filter inductance.In charging mode, by parallelly connecting charging unit to the upper bridge arm of right half bridge, and using battery unit access or bypass control of left half bridge, i.e., the selective charging of any single battery can be realized, so that battery equalization management capability is realized.

The utility model discloses a device for measuring system capacitance current by using an injection method. The device comprises a measurement and signal generator and an integrated injection transformer, the measurement and signal generator internally comprises an H-bridge inversion unit, an LCL filter circuit, a power supply and a controller; the integrated injection transformer comprises a boosting transformer, a voltage transformer and a current transformer; the output end of the controller is connected with the controlled end of the H-bridge inverter unit; the power supply, the H-bridge inverter unit and the LCL filter circuit are sequentially connected in series, the output end of the H-bridge inverter unit is connected to the boosting transformer through the LCL filter circuit, and the other end of the boosting transformer is a signal output end X. According to the utility model, signals with different frequencies are injected into the system, and the capacitance current of the system is calculated by establishing a loop equation according to different zero sequence loop impedances of the system under different frequencies; as the measurement and signal generator and the boosting transformer are large in capacity, the requirement for accurate back measurement after signal injection is met, and therefore the measurement accuracy is high.

The application discloses a kind of cascade type hybrid energy storage system coordinated control method, comprising: based on the output voltage and current of the hybrid energy storage system collected, determine the actual output power of system, determine power difference value in combination with the power reference value of pre-setting or dispatching;According to the positive and negative of output current, judge whether the system is in discharge or charging mode, mode is used to limit virtual parameter adjustment boundary;Based on power difference value and mode, self-adaptive calculation and update virtual resistance and virtual capacitance;The updated virtual resistance and virtual capacitance are respectively used as the virtual impedance parameter of battery branch and other type energy storage unit branch, generate corresponding voltage deviation instruction;Voltage deviation instruction is input into double closed loop controller, generate the PWM duty cycle signal of each DC-DC converter, realize dynamic coordinated control to battery and other type energy storage unit according to PWM duty cycle signal.The method can make the energy storage system of H bridge inverter reduce overshoot and oscillation, quickly reach steady state.

The utility model discloses a dynamic voltage restorer in a high-frequency isolation mode. The dynamic voltage restorer is connected in series between a power grid US and a sensitive load UL. The dynamic voltage restorer comprises a direct current source Udc, a high-frequency isolation DC / DC circuit, an H-bridge inverter circuit and a thyristor bypass system. The direct current source Udc provides a direct current power supply for the high-frequency isolation DC / DC circuit, and the output of the high-frequency isolation DC / DC circuit is connected with the H-bridge inverter circuit to provide stable direct current voltage for the H-bridge inverter circuit; the output of the H-bridge inverter circuit is connected with the control end of the thyristor bypass system, the input end of the thyristor bypass system is connected with a power grid US, and the output end of the thyristor bypass system is connected with a sensitive load UL. The beneficial effects of the utility model are that the system response speed is fast, the power density is high, the reliability is good, the isolation degree is high, the continuous compensation is supported, and the negative influence of the secondary pulsation on the cascade system is eliminated at the same time.

The invention discloses a cascade multi-level energy storage converter topology and a control method thereof, the DC input side of the topology adopts half-bridge sub-modules powered by independent batteries to be connected in series in groups, and the AC output side adopts multiple groups of H-bridge inversion units to be connected in series to form a secondary cascade structure. According to the topology, by flexibly configuring the number of battery packs and the number of half-bridge sub-modules in each group, the optimal balance between the number of switching devices and the voltage stress of the devices is realized, and the topology has the advantages of a cascaded H-bridge topology and a cascaded half-bridge topology. In the control method level, a switching device is controlled based on carrier stacking modulation and zero crossing point modulation, a double-closed-loop quasi-proportional resonance controller is adopted to carry out closed-loop control on an output voltage waveform, an equalization algorithm based on battery state parameter sorting is combined, high-quality multi-level output is achieved, and meanwhile battery online energy equalization is completed. The problems that a multi-level energy storage converter is large in traditional topology device number, high in cost, large in high-voltage device stress, poor in expansibility, difficult in battery management and the like are solved.

The application discloses a kind of for the series H bridge inverter of track type wireless electric energy transmission system and system of over-ride fault-tolerant control method, it is related to wireless electric energy transmission technical field, the present application does not need high-speed communication between modules, only phase synchronization is reserved, current loop automatic takeover when fault is cut out is realized, track current fluctuation is small, and recovery is fast;When fault recovery is accessed, the output of recovery unit is gradually established by power ring domination, and the track current is maintained by current loop domination by healthy unit, without impact smooth redistribution;And by parameter design makes full load resistance, light load inductance, satisfies full load range soft switch, reduces loss.