8results about How to "Uniform control" patented technology

The DC-DC converter of the battery pack of the present invention includes a dual active bridge converter and an equalizer converter, both of which share a first half-bridge circuit, and also includes series-connected battery modules. The equalizer converter includes a filter inductor, a bidirectional switching circuit, and a diode circuit. The two ends of the diode circuit are respectively connected to the two ends of the series-connected battery modules. The midpoint of the diode circuit and one end of the bidirectional switching circuit are both connected to the same end of the filter inductor. The other end of the filter inductor is connected to the series midpoint of the series-connected battery modules. The other end of the bidirectional switching circuit is connected to the midpoint of the bridge arm of the first half-bridge circuit. The two ends of the first half-bridge circuit are respectively connected to the two ends of the diode circuit. The structure is simple, the number of converters is small, and the cost is saved while improving the utilization rate of the components. The control method of the DC-DC converter of the battery pack of the present invention realizes the control method of balanced power regulation between two series-connected battery modules.

The application provides a battery device, a UPS and an energy storage system. The battery device comprises: a main battery pack configured to provide or receive electric energy; at least one slave battery pack configured to provide or receive electric energy, the at least one slave battery pack comprising one or more first slave battery packs connected in series, the first slave battery pack being connected in series with the main battery pack, and the main battery pack and the first slave battery pack each comprising one or more battery cells connected in series; and a communication isolation module connected between the main battery pack and the slave battery pack. The battery device, the UPS and the energy storage system provided by the application can reasonably balance the battery cells in the battery device, and improve the performance and service life of the battery device.

This invention proposes a construction method for restoring the locking temperature during flash welding repair of damaged rails on existing railway lines, belonging to the field of railway rail maintenance. The method includes: determining the rail temperature and the length of the rail construction section; calculating the allowable stretching amount of the rail based on the rail temperature and the length of the rail construction section; performing over-stretching of the rail based on the allowable stretching amount; sawing the damaged rail, inserting a new rail, and performing flash welding; and restoring the straightness of the rail construction line. This invention's method for restoring the locking temperature during flash welding repair of damaged rails on existing railway lines ensures a uniform and consistent track locking temperature, effectively guaranteeing the control and uniformity of the rail temperature. It solves the problem of track instability caused by the inconsistency between the construction temperature and the track locking temperature during the replacement of damaged rail components, which leads to the breakdown of the track's resistance to rail expansion and directly affects the stability of the line and traffic safety.

The application discloses a super capacitor module, comprising: a plurality of super capacitor units arranged in an array of multiple rows and multiple columns and connected in series through a connecting row; a voltage acquisition circuit connected with the super capacitor units one by one, used for respectively acquiring voltage information of each super capacitor unit; a sampling chip connected with the voltage acquisition circuit, used for sampling the voltage information of each super capacitor unit to obtain voltage sampling data; a health management module connected with the sampling chip, used for receiving the voltage sampling data; a plurality of voltage equalization control circuits connected with the super capacitor units one by one, and a control end of the voltage equalization control circuit being connected with the sampling chip. Under the synergistic effect of the pressure drop equalization structure and the hardware such as the voltage acquisition, voltage sampling, voltage equalization control and health management module, the equalization control and health management of the super capacitor module are realized, so that the super capacitor module can stably operate under a predetermined working condition, and the service life of the super capacitor module is prolonged.

The invention relates to the technical field of heat pump control, and discloses a multi-heat-pump linkage control method, device and system and a storage medium, which are used for balance control of multiple heat pumps, meet the load requirement, start the heat pumps to operate in the optimal interval, improve the energy efficiency, reduce the energy consumption and reduce the cost. The multi-heat-pump linkage control method comprises the steps that the first actual starting number and multiple operation condition parameters of the heat pump centralized control system in the current adjusting period are obtained; determining the maximum conversion rate corresponding to each started heat pump in a preset heat pump performance monitoring table according to the plurality of operation condition parameters; a centralized control conversion rate reference value is determined according to the maximum conversion rates corresponding to the multiple heat pumps, and a target operation frequency interval corresponding to the centralized control conversion rate reference value is obtained; and performing linkage control on each heat pump in the heat pump centralized control system according to the plurality of operation condition parameters, the first actual starting number and the target operation frequency interval.

The application provides a photovoltaic direct-current grid-connected converter control method which considers power module current sharing and MPPT, encodes power modules in the direct-current grid-connected converter, sets initial values of duty cycle and other control parameters, samples photovoltaic array state information, determines a duty cycle disturbance direction, calculates a photovoltaic array power disturbance increment, determines a duty cycle disturbance increment, determines the number of power modules which are disturbed according to power module current information, updates the duty cycle of the disturbed power modules according to the number of the disturbed modules and the disturbance increment, and controls the turn-on and turn-off of the switch tube according to the power module duty cycle modulation signal. The method controls the maximum power tracking and the power module current sharing simultaneously, omits the current closed-loop control link, and can realize current sharing of any multiple power modules.

The utility model discloses a bidirectional silicon controlled rectifier with a symmetrical longitudinal structure, which comprises an N-type silicon substrate, the N-type silicon substrate comprises an N-type silicon substrate front surface and an N-type silicon substrate back surface, and the N-type silicon substrate front surface and the N-type silicon substrate back surface are symmetrically provided with a front surface P-type short base region and a back surface P-type short base region. A front voltage dividing ring is arranged on the outer side of the front P-type short base region, a back voltage dividing ring is arranged on the outer side of the back P-type short base region, and the front voltage dividing ring and the back voltage dividing ring are symmetrically arranged on the front side of the N-type silicon substrate and the back side of the N-type silicon substrate relative to the N-type silicon substrate; according to the utility model, the structure is simple, the design is reasonable, forward off-state voltage is borne by the front P-type short base region and the front voltage dividing ring, reverse off-state voltage is borne by the back P-type short base region and the back voltage dividing ring, the voltage is completely symmetrical, a punch-through structure is not needed, and the production efficiency can be greatly improved.

This invention relates to a negative electrode-free lithium-ion battery and its preparation method. The preparation method includes: mixing and stirring a high-nickel ternary active material, a conductive agent, and a binder to fibrousize the binder, obtaining a mixed powder; hot-rolling the mixed powder to obtain a self-supporting electrode film; hot-pressing the self-supporting electrode film with a carbon-coated aluminum foil current collector to obtain a positive electrode sheet; lithiophilizing the copper foil current collector to obtain a negative electrode sheet with a lithiophilic gradient modification layer; stacking the positive electrode sheet, negative electrode sheet, and separator into a battery cell; injecting a prepared electrolyte; vacuum sealing and allowing it to stand to obtain a negative electrode-free lithium-ion battery. This preparation method constructs a low-torsion directional ion channel on the positive electrode side and simultaneously constructs a gradient-varying lithiophilic nucleation site on the negative electrode side, thereby achieving uniform control of the entire lithium-ion extraction-migration-deposition process.