6results about How to "Solve the circulation problem" patented technology

The utility model discloses an energy storage system which comprises a box body, and a battery cluster, an energy storage high-voltage control box, a DC / DC device and an inversion device are arranged in the box body. The number of the battery clusters is multiple, the number of the energy storage high-voltage control boxes is the same as that of the battery clusters, and the input ends of the energy storage high-voltage control boxes are connected with the battery clusters in a one-to-one correspondence mode. The number of the DC / DC devices is multiple, each DC / DC device comprises a DC voltage stabilization channel, the DC voltage stabilization channels included in the multiple DC / DC devices are mutually independent, the number of the DC voltage stabilization channels is the same as that of the energy storage high-voltage control boxes, and the input ends of the DC voltage stabilization channels are connected with the output ends of the energy storage high-voltage control boxes in a one-to-one correspondence mode. The output end of the direct current voltage stabilization channel is electrically connected with the input end of the inversion device. By the adoption of the scheme, the problem of how to reduce circulating current and risks caused by direct-current confluence type design is solved.

This invention discloses a multi-branch battery pack high-voltage system and its control method. The multi-branch battery pack high-voltage system includes: multiple battery pack branches, a charging control module, and a discharging control module. Each battery pack branch includes a battery pack, a battery drain interrupter (BDU), and a bidirectional DC-DC converter module. The battery pack is connected to the input terminal of the BDU. The BDU has a main circuit and an equalization circuit. The main circuit controls the on / off of the main power of the battery pack branch it belongs to. The BDUs of each battery pack branch are connected to each other through the equalization circuit for active equalization between branches. The output terminal of the BDU is connected to the input terminal of the bidirectional DC-DC converter module, which controls the charging and discharging current of its respective battery pack branch. The output terminals of all bidirectional DC-DC converter modules are connected in parallel and then connected to the charging control module and the discharging control module. This invention can solve the circulating current problem between battery packs and improve the stability of the multi-branch battery pack high-voltage system.

The invention relates to the technical field of intelligent power grids and industrial automation control, in particular to a DC power supply coordination control system based on industrial big data. The system comprises a multi-dimensional heterogeneous data sensing module, a feature mapping module, a multi-target collaborative decision-making module and a self-adaptive execution module. The system constructs a load characteristic and electric energy quality correlation model based on the operation state and the power consumption demand, outputs dynamic electrical characteristics and sensitivity characteristics, and solves a power distribution instruction by taking power grid quality, load balance and efficiency as cooperative targets; according to the method, a perception decision-making framework crossing an electrical domain and a physical domain is constructed, hidden physical layer states such as impedance drift are mined through deep learning, the problem that a load physical state is ignored and production quality is disjointed in traditional control is solved, and the industrial yield and energy efficiency are improved while the quality of a power grid is guaranteed.

The embodiment of the invention discloses a rail transit system, power modules applied to the rail transit system and an input control method, and the control method comprises the steps that the rail transit system comprises a plurality of power modules connected in parallel, the direct current ends of the power modules are connected with a direct current traction network, and the alternating current ends of the power modules are connected with an alternating current power grid; the control method comprises the following steps: controlling the working state of a first power module to be switched from an exit state to an operation state within a first duration when a train enters a stable operation stage; wherein the sum of the first time length and the second time length is smaller than or equal to the time length of the stable operation stage, and the second time length is the time length required by the first power module to complete switching of the working state from the quit state to the operation state. The first power module is any one of the power modules which is currently in a quit state and has abnormities eliminated, and the stable operation stage is located between a traction stage when the train is started and a feedback stage when the train is braked.

The application discloses an improved distributed collaborative control method for a ship-mounted hybrid energy storage system, and comprises the following steps: obtaining actual current and voltage on a direct-current bus; obtaining current and voltage at an output port of a direct-current converter to obtain output power of the direct-current converter; obtaining voltage output by a storage battery and a super capacitor respectively based on proportional droop and integral droop control methods; obtaining a state of charge of the super capacitor based on the voltage output by the super capacitor; compensating a bus voltage regulation factor to the proportional droop control to accelerate the recovery speed of the state of charge of the super capacitor; obtaining a SoC dynamic adjustment factor based on a novel SoC dynamic adjustment algorithm, so that the storage battery gradually realizes SoC balance in the charging and discharging process, and no circulating current phenomenon occurs; and transient power distribution is realized between the storage battery and the super capacitor, and a high-frequency part of load power change is automatically distributed to the super capacitor, and a low-frequency part is compensated by the storage battery.

This invention provides an energy storage system, relating to the field of energy storage. The energy storage system includes an inverter device and multiple battery pack devices; each battery pack device includes at least a battery pack unit and a DC-DC converter; the inverter device sends charge / discharge signals to each battery pack device, and the battery pack devices, under the influence of the charge / discharge signals, charge and discharge the battery pack units via the DC-DC converters. This invention solves the problem of output current differences and circulating current issues caused by differences in electrical characteristics between battery pack units by connecting the DC-DC converters and battery pack units in series in each battery pack device. This avoids the deterioration of the electrical characteristics of the battery pack units, reduces the power range and voltage rating requirements of the DC-DC converters, lowers the circuit cost and power consumption of the energy storage system, and ensures the stability and reliability of the energy storage system during operation.