7 results about "Dc bus voltage regulation" patented technology

The invention discloses a buck-boost circuit, a control method, a driving circuit and electric equipment. The buck-boost circuit comprises a sampling module, the first end of which is connected with the positive terminal of a DC bus, the second end of which is grounded, and the third end of which is connected with a control module, and which is used for collecting the voltage of the DC bus; the buck-boost module is arranged on the direct current bus and comprises an excitation loop arranged on the output side of the rectifier module; the power supply loop is arranged on the input side of the inversion module; the power supply loop is connected with the excitation loop; and the control module is used for switching the conduction state of the power supply loop according to a set period, and adjusting the conduction duration of the excitation loop in one period according to the direct current bus voltage so as to control the boost-buck module to boost and buck. According to the invention, the buck-boost of the buck-boost module can be adaptively controlled according to the fluctuation condition of the bus voltage, thereby reducing the fluctuation amplitude of the DC bus voltage.

The invention discloses an energy storage battery direct-current grid-connected system for preventing bus current feedback, relates to a grid-connected power circuit and a grid-connected control circuit, and belongs to the field of direct-current bus voltage regulation and control. The system comprises a control part and a power part, the control part comprises a storage battery voltage isolation sampling unit, a data processing unit, a bus voltage isolation sampling unit and an isolation driving unit; the power part comprises a storage battery unit, a load unit, a power generation unit, an MOS tube unit, an ideal diode unit and a fly-wheel diode unit. Three system states of grid-connected channel closing, trickle charging and grid-connected channel opening are switched by analyzing the magnitude relationship between the storage battery voltage and the bus voltage in real time, the storage battery is prevented from being damaged by impact current, the long-term floating charging performance is prevented from being reduced, meanwhile, the bus energy is fully utilized, and the system reliability is improved. The method is especially suitable for a system which takes generator power supply as a main power supply and storage battery emergency power supply as an auxiliary power supply and has inductive load on a bus.

This invention discloses a wide-range radio frequency power conversion system based on an asymmetric hybrid structure and hybrid modulation. It adopts an input parallel, output series architecture, consisting of a main power regulation module and several auxiliary power modules. The main power regulation module includes a front-stage Buck-Boost converter and a rear-stage dual-parallel full-bridge resonant unit, possessing fine voltage and phase adjustment capabilities. The auxiliary power modules are simplified full-bridge units, responsible only for discrete power switching. The system employs a hybrid modulation strategy, utilizing phase-shift control of the main power module in the low-power range, DC bus voltage regulation of the main power module in the medium-power range, and full-bridge / bypass mode switching of the auxiliary power modules in the high-power range, achieving smooth and continuous adjustment from zero to rated power. This architecture, through optimized design of resonant network parameters and utilization of the internal resonant circulating current generated by the main module in phase-shift state, ensures zero-voltage switching (ZVS) operation across the entire range, significantly reducing system hardware costs and control complexity while significantly improving system efficiency in power back-off state.

Systems and methods relating to control systems for DC / AC inverters that receive power from photovoltaic based renewable energy resources. When the DC / AC inverters are operated in on-grid mode, the DC / AC inverters and the DC / DC control system operate to provide on-grid functions such as maximum power point tracking (MPPT) and DC-bus voltage regulation. When in off-grid mode, the DC / AC inverter and the off-grid control system regulates the resulting AC voltage from the DC / AC inverter to be within a pre-set range. The off-grid control system is based on differential geometry and uses a Lie Group controller for setting a frequency reference signal. The frequency and current amplitude reference are used to generate a sinusoidal current reference signal which is then tracked by a current controller. The current controller controls the switches in the DC / AC inverter to regulate the AC voltage.

The application discloses a kind of inter-battery equalization power transmission system and method of battery pack, it is related to battery management technical field, the method includes: each slave control module real-time data acquisition, and upload to main control module;Main control module each battery pack health state and corresponding dc converter operating efficiency, for each battery pack allocation dynamic weight factor, generate dynamic optimal bus voltage reference value, and control main converter will public dc bus voltage be adjusted to reference value;When determining that inter-battery energy transmission is needed, energy transmission instruction is issued to relevant slave control module;The expected performance of direct energy transmission path and through relay battery pack is analyzed to carry out relay energy transmission path, the path with higher expected performance is selected as the final energy transmission scheme, and is issued to relevant slave control module;Slave control module generates charge-discharge control instruction according to energy transmission scheme, and completes equalization power transmission.

This application relates to a communication-free dynamic voltage droop control method and system for DC microgrids. The DC microgrid includes multiple distributed generation units, each equipped with a power electronic converter and a local controller. The method collects local voltage, current, and DC bus voltage measurements from each distributed generation unit, inputs the measurement data into the artificial intelligence control module in the local controller, and generates adaptive voltage droop control parameters in real time based on a pre-trained deep reinforcement learning model. These parameters are then applied to the voltage reference value generation stage of the power electronic converter. Through dual closed-loop control of voltage and current, DC bus voltage regulation and power sharing among distributed generation units are achieved. Each distributed generation unit operates independently, and there is no communication between units during the control process. This application eliminates the need for a secondary control layer, achieving decentralized and stable operation under load fluctuations and power supply changes.

The invention provides a port micro-grid direct current bus voltage intelligent control method based on a virtual direct current motor, and relates to the technical field of port micro-grid control. The method comprises the following steps: firstly, collecting port microgrid DC bus voltage, and establishing and discretizing a virtual DC motor model; then, a tight-format dynamic linearization data model between the virtual mechanical torque and the direct-current bus voltage is constructed; a pseudo partial derivative is calculated based on input and output data, a model-free adaptive controller is designed, and adaptive compensation of the virtual mechanical torque is realized; performing adaptive adjustment on parameters of the model-free adaptive controller by utilizing reinforcement learning; and finally, simulating external characteristics of the direct-current motor by controlling the power converter to realize stable control of the direct-current bus voltage. According to the method, the DC bus voltage fluctuation caused by loading and unloading equipment start and stop, load switching and new energy output fluctuation in the port microgrid can be effectively suppressed, and the dynamic response performance of DC bus voltage regulation and the system operation stability are improved.