726 results about "Dc circuit" patented technology

The invention discloses a charging and discharging control method and device for an elevator energy storage system, a medium and a product, and relates to the field of data processing. The method comprises the steps that real-time operation data such as the position and the load capacity of an elevator car are obtained, and the instantaneous power generation power and the power change rate of a traction machine are determined accordingly; determining a power change predicted value in a future preset time period based on the parameters, and obtaining the total amount of power generation energy required to be stored by the energy storage system through zero setting of a positive value, integral operation and efficiency compensation; according to the power change rate, the state of the energy storage unit and the power grid electricity price time period, the charging and discharging priorities fed back by the super capacitor, the lithium battery and the power grid are determined; controlling the bidirectional DC / DC circuit to switch charging and discharging modes according to the priority, and adjusting the PWM duty ratio of the brake resistor; and based on the charging and discharging mode and the duty ratio, charging and discharging control over the elevator energy storage system is achieved. According to the method, the problem of inaccurate real-time matching of the dynamic load and the energy fluctuation of the current elevator energy storage system can be relieved.

The invention relates to the technical field of power electronic devices, in particular to a low-voltage direct-current circuit breaker, a fault protection method and a related device.The low-voltage direct-current circuit breaker comprises a through-flow branch, a transfer branch and an energy consumption branch which are connected in sequence; the through-current branch comprises an isolating switch and an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) commutation switch which are connected in series; the transfer branch comprises a first power electronic switch group and a buffer branch which are connected in parallel; the energy consumption branch comprises a first metal oxide MOV, a second metal oxide MOV and a second power electronic switch group; the first metal oxide MOV is connected in parallel with the second power electronic switch group; and the second metal oxide MOV is respectively connected with the first metal oxide MOV and the second power electronic switch group. The technical problems that an existing hybrid direct current circuit breaker is not suitable for a low-voltage direct current system and the loss is high in the turn-off process are solved.

The invention discloses a two-stage multi-mode bidirectional inverter circuit, which comprises a direct-current power supply DC, an alternating-current power supply AC, a DC / DC circuit, a direct-current voltage-dividing capacitor Cb1, a direct-current voltage-dividing capacitor Cb2, a DC / AC circuit and a controller, and is characterized in that a negative electrode of a second port of the DC / DC circuit is connected with a negative electrode of the direct-current voltage-dividing capacitor Cb1 and a negative electrode of a direct-current port of the DC / AC circuit; a middle point of a second port of the DC / DC circuit is connected with a negative electrode of a direct-current voltage-dividing capacitor Cb1 and a positive electrode of a direct-current voltage-dividing capacitor Cb2, and is connected to an alternating-current neutral line N; the AC port of the DC / AC circuit is connected with an AC live wire L1 and an AC live wire L2. The controller stably outputs voltage or current by controlling the DC / DC circuit and the DC / AC circuit, and bidirectional electric energy conversion is achieved. According to the invention, direct-current capacitance and additional circuits do not need to be increased, the size of the device is reduced, the system cost is reduced, the conversion efficiency is improved, and the device can be widely applied to new energy power generation and energy storage and other industrial and civil bidirectional power conversion systems so as to meet the global power supply and consumption requirements.

This application discloses a power electronic transformer wherein each phase includes a plurality of power conversion modules. Each power conversion module includes a rectifier AC / DC circuit, a direct current bus capacitor, and a direct current-direct current DC / DC circuit. In each power conversion module, an output end of the AC / DC circuit is connected to an input end of the DC / DC circuit; the direct current bus capacitor is connected in parallel to the output end of the AC / DC circuit; and input ends of all the AC / DC circuits are connected in series, and output ends of all the DC / DC circuits are connected in parallel. The power electronic transformer includes a relatively small quantity of power conversion modules, thereby reducing occupied space and costs.

The invention discloses a parameter control method for a bidirectional power conversion circuit with alternating current and direct current electric energy interchange, which relates to the technical field of circuit parameter control, and comprises the following steps: respectively carrying out electric energy conversion on an alternating current side and electric energy adjustment on a direct current side by adopting a topological structure in which a three-phase voltage source type converter and a direct current circuit bidirectional converter are connected in series; collecting parameters of the AC-DC bidirectional power converter in real time; switching among three working modes of rectification, inversion and shutdown is realized; the DC bus voltage is kept at a rated value when supply and demand in the DC subnet are balanced, and bidirectional flow of power is realized when supply and demand are unbalanced; performing coordinate transformation on the acquired voltage and current; and separating positive and negative sequence components of the voltage by using a second-order generalized integrator algorithm. By adopting a specific topological structure and utilizing the droop characteristic to realize working mode switching, the adaptability and the control precision of the bidirectional power converter in the alternating current and direct current hybrid micro-grid are improved.

The utility model provides an electric energy meter calibrating device comprising a calibrating box body, the calibrating box body comprises a first plate and a second plate which are arranged at intervals along a first direction, and at least one of the first plate and the second plate is provided with at least one first air port; the second air opening is formed in the plate body for connecting the first plate and the second plate; the supporting partition plate is arranged in the verification box body in the first direction, and the space in the verification box body is divided into a first cavity and a second cavity by the supporting partition plate; the plurality of direct-current circuit boards are connected with the supporting partition plate, the direct-current circuit boards are arranged in the first cavity, and at least one direct-current circuit board is provided with a first heating piece; the at least one first fan is arranged on the supporting partition plate, and the first fan and the first heating piece are oppositely arranged; and the plurality of alternating-current circuit boards are connected with the supporting partition plate and are arranged in the second cavity. According to the technical scheme, the direct current circuit board and the alternating current circuit board are arranged in a layered mode, the heat dissipation capacity of the device is remarkably improved, and the temperature of the whole system is kept stable.

The invention discloses a fault current analysis method and system for a multi-terminal flexible DC circuit, and the method comprises the steps: analyzing fault current data when the DC side of a modular multilevel converter is short-circuited, and obtaining time sequence segmentation rule data; performing equivalent processing on the modular multilevel converter based on the segmentation rule data to obtain an equivalent circuit model comprising an RLC series circuit and a time-varying current source; constructing a second-order differential equation for describing the fault current according to the equivalent circuit model, and solving the second-order differential equation to obtain a fault current expression containing dynamic alternating current feed-in; constructing a fault equivalent network of the multi-terminal flexible DC circuit; and constructing a state-space equation of the fault equivalent network based on a branch current method and the fault current expression, and solving the state-space equation to obtain fault current data of the multi-terminal flexible DC circuit. According to the method, the accuracy of fault analysis is improved.

The utility model belongs to the technical field of new energy vehicle charging, and discloses an alternating current and direct current integrated charging socket which comprises a square plate, an alternating current socket assembly and a direct current socket assembly are arranged on the square plate, the alternating current socket assembly comprises an AC insulator, an AC tail cover is arranged on the rear side of the AC insulator, and an AC circuit board is arranged in the AC tail cover. The AC circuit board is provided with five AC power contacts, two pin contacts and four chip resistors, the DC socket assembly comprises a DC insulator, the rear side of the DC insulator is provided with a pressing plate, the DC insulator is internally provided with a DC circuit board, the DC circuit board is provided with two DC power contacts and six pin contacts, the DC power contacts are provided with temperature sensors, and the temperature sensors are provided with temperature sensors. And the six pin contacts and the two temperature sensors on the DC circuit board are communicated to the ten-core low-voltage plug-in. The signal pin of the charging gun is in direct contact with the circuit board, signals are collected by the circuit board and then are connected with an automobile control system through a signal line, signal transmission can be carried out without redundant parts and wire harnesses, the structure is simple, and assembly is easy.

The invention relates to a ripple suppression PI loop control method, a storage medium and a device, and the method comprises the steps: extracting a frequency doubling component in an inversion power flow based on the filtering and Park transformation of a secondary second-order generalized integrator, determining the reverse compensation amount at each moment based on the frequency doubling component and a battery connected with a DC circuit, and carrying out the control of the ripple suppression PI loop. And finally, based on the sum of the reverse compensation amount at each moment and an original reference current value output by a voltage outer ring on each bridge arm of the DC circuit, determining a current reference instantaneous value after reverse compensation of a current inner ring input to each bridge arm at each moment. According to the method, a pure frequency doubling component with very high dynamic performance and related to ripple information is obtained, then according to the extracted frequency doubling component and battery parameters, the reverse compensation amount used for suppressing ripple in loop control is obtained, and then the reverse compensation amount is accumulated to a voltage outer loop, so that the ripple information is suppressed. Therefore, ripple suppression with good dynamic performance and good suppression effect in loop control is realized.

The invention provides a voltage regulation device based on a two-stage DC-DC circuit. The voltage regulation device comprises a voltage acquisition module, a current acquisition module, a controller, a first-stage DC-DC converter, a second-stage DC-DC converter, a first driving circuit and a second driving circuit, the controller is used for receiving a voltage value and a current value acquired by the voltage acquisition module and the current acquisition module, and respectively sending control instructions to the first-stage DC-DC converter and the second-stage DC-DC converter through the first driving circuit and the second driving circuit to adjust the voltage; the regulation method of the controller on the first-stage DC-DC converter is that a proper first-stage DC-DC modulation duty ratio is selected according to the calculated ideal modulation ratio; the adjusting method of the controller on the second-stage DC-DC converter is a sliding mode control algorithm. The method has the advantages that the conversion efficiency is remarkably improved, power loss and heat generation are reduced, high stability and reliability are kept, and the method is suitable for aerospace application.

The invention provides a PCS-based multi-battery non-isolated insulation detection system, a PCS-based multi-battery non-isolated insulation detection method, a medium, a program product and a terminal, the PCS is used for forming a charging pile to charge and discharge a battery of a battery swap station, the battery and the charging pile are respectively subjected to insulation detection before interaction, then the battery insulation detection is closed, and then the PCS charging pile executes global direct current loop insulation detection, so that the insulation detection efficiency is improved. According to the technical scheme, the efficiency of a charging and discharging system is improved, a traditional transformer is adapted, the problem of parallel connection of multiple batteries is solved, and the technical problems that an existing battery replacing station is low in efficiency, and parallel connection of the multiple batteries is difficult are solved.

The invention relates to an AC / DC bidirectional energy efficiency analysis method and analysis system applied to a photovoltaic transformer area. The AC / DC bidirectional energy efficiency analysis method comprises the following steps: synchronously acquiring parameter information in an AC circuit and parameter information in a DC circuit; calculating the active power P1 in the AC circuit and the effective power P2 in the DC circuit according to the parameter information; calculating an electric energy input / output value E1 of the alternating current circuit in the period; and calculating an electric energy input / output value E2 of the direct-current circuit in the period. According to the invention, the bidirectional flow condition of alternating current and direct current electric energy is accurately and efficiently metered, and the metering and analysis result provides powerful support for efficient utilization and lean management of electric energy. By calculating the electric energy ratio, the efficiency and the performance of the system can be directly reflected, the economical efficiency and the reliability of the alternating current and direct current hybrid power distribution network planning scheme can be accurately evaluated, a basis is provided for optimizing system design and operation, and then safe operation of the alternating current and direct current hybrid power distribution network is better guaranteed.

A charging apparatus is applied to a new energy vehicle. The new energy vehicle includes a first battery and a second battery. The first battery provides driving power for the new energy vehicle, and the second battery supplies power to a vehicle-mounted load device. The apparatus includes a charging unit and a general-purpose unit. The charging unit includes a DC-DC circuit and a BMS. The general-purpose unit includes a control module, a communication module, and an auxiliary power supply module. The auxiliary power supply module supplies power to the charging unit and the control module. The control module is configured to control the charging unit to provide electric energy of the first battery to the second battery. According to the apparatus provided in this application, a volume and a weight of the charging apparatus can be reduced, a service life of a battery can be prolonged.

An atomic object confinement apparatus comprising a plurality of electrodes and one or more quasi-direct-current (quasi-DC) circuits. The plurality of electrodes comprise a plurality of radio frequency (RF) rail electrodes arranged to define, at least in part, a periodic array of confinement segments. The plurality of RF rail electrodes are configured such that, when an oscillating voltage signal is applied thereto, the plurality of RF rail electrodes generate a pseudopotential in a form of an array of trapping regions configured to contain at least one atomic object within a respective trapping region of the array of trapping regions. The one or more quasi-direct-current (quasi-DC) circuits are arranged to generate a magnetic field having a selectable magnitude and a selectable direction, such that the generated magnetic field acts on at least one atomic object within the array of trapping regions.

This invention relates to the field of energy storage technology and discloses a synchronous testing platform for multiple energy storage converters and its control method. The testing platform of this invention includes: an incoming line switch, a pre-charge circuit, a transformer, an auxiliary power supply switch, an AC circuit breaker, a DC circuit breaker, and a unit controller. The power grid is connected to the high-voltage side of the transformer sequentially through the incoming line switch and the pre-charge circuit. One side of the AC circuit breaker is connected to the windings on the low-voltage side of the transformer, and the other side is connected to the AC side of the energy storage converter. The DC side of the first group of energy storage converters is connected to the DC side of the second group of energy storage converters through DC circuit breakers. The first group of energy storage converters is connected to the auxiliary power supply. In this invention, after the first group of PCS (Power Storage Converters) is pre-charged, the pre-charge circuit is bypassed. Then, the first group of PCS is unlocked and controlled in DC voltage mode, and the second group of PCS is started sequentially, thereby achieving synchronous charging and discharging testing of 2N PCS, greatly improving the charging and discharging testing efficiency of the energy storage converter.

The invention relates to a switching control circuit and a switching power supply. The switching control circuit comprises a switching module and a control module. The switch module is connected with the first output assembly, the first output port, the second output assembly and the second output port. The control module is connected with the switch module and used for controlling the switch module to conduct connection between the first output assembly and the second output port so that the first output signal can be transmitted through the second output port. Visibly, according to the application, different power output signals of different groups of AC-DC circuits in the same power supply design can be switched and output at different output ports through the switch module and the control module, so that the output of any group of AC-DC conversion circuits can be switched to the output of the output port of any other AC-DC conversion circuit; a DC-DC conversion circuit / module does not need to be arranged, any group transfer of output voltage, current and power of multiple groups of AC-DC conversion circuits is realized, and the overall efficiency of multi-path output of the switching power supply is improved.

The invention provides a direct current arc fault detection and elimination circuit and method, the circuit is connected with a relay, and the circuit comprises a switching power supply module, an MCU processor module, a direct current signal sampling module and a relay switch driving module; the direct current signal sampling module and the switching power supply module are powered by external direct current; the switching power supply module is connected with the MCU processor module, the direct current signal sampling module and the relay switch driving module; the direct current signal sampling module receives a current signal of a direct current circuit to be detected and outputs an analog voltage signal, and the analog voltage signal is transmitted to a PA0 port of the MCU processor; the AD conversion module in the MCU converts the analog voltage signal into a digital signal, and the MCU processor module sends a control signal to the relay switch driving module based on the digital signal. According to the scheme, high-voltage wide-voltage input is adopted, performance is stable, ripple waves are low, noise is low, the detection precision can reach the milliampere level, performance is reliable, the structure is simple, and cost is saved.

A control method for a hybrid power locomotive, and a related assembly, relating to the field of locomotive power supply. A second voltage outputted by a controllable rectifier module is adjusted by means of a first voltage of an output end of the rectifier module, namely, a voltage inputted by a diesel engine power supply module to an intermediate direct-current circuit is adjusted, that is, a voltage difference between the voltages generated by two power sources, i.e., an overhead contact line and a diesel engine, is eliminated, so that the two power sources can simultaneously supply power for the hybrid power locomotive. Moreover, a connection mode of the diesel engine power supply module and the intermediate direct-current circuit is controlled by means of the connection / disconnection between an input end of a controllable switch module and a first output end, and the connection / disconnection between the input end and a second output end, namely, a connection relationship between the diesel engine power supply module and the assistance load and traction system of the hybrid power locomotive is controlled, that is, power source switching is controlled by controlling the controllable switch module, so that during power source switching, power supply is not stopped, and seamless switching can be realized.

The invention belongs to the technical field of direct-current power transmission, and discloses an IGCT assembly structure for a converter valve, and the structure comprises a valve assembly and a press-fitting part which is used for carrying out the press-fitting and fixing of the valve assembly. The valve assembly comprises n IGCT devices, n + 1 water-cooled radiators, 2n static voltage-sharing resistors, n lightning arresters and 4n damping resistors. The n IGCT devices and the (n + 1) water-cooled radiators are arranged in a stacked manner; the 2n static voltage-sharing resistors and the 4n damping resistors are arranged on the water-cooling radiator; and each lightning arrester is connected with the water-cooled radiator through the first connecting busbar. According to the valve assembly, the IGCT device is used, the problem of commutation failure of the direct-current power transmission technology is solved, meanwhile, the IGCT device is a full-control device, control over switching-on and switching-off is achieved, when a direct-current system breaks down, the valve assembly can also be used as a direct-current circuit breaker, and controllability is high; devices of the valve assembly are distributed on the water-cooling radiator, and the heat dissipation function of the water-cooling radiator is fully utilized.

The utility model belongs to the technical field of vehicle lamp circuits, and specifically relates to a system for a vehicle taillight ECU to enter a functional safety mode based on an MCU failure, comprising: a LIN transceiver, a first control circuit, a second control circuit, an MCU microcontroller, an LDO circuit, a DC-DC circuit, a CAN transceiver, an LED drive circuit, and an LED, wherein the LIN transceiver, the first control circuit, and the second control circuit are all connected to a vehicle body KL30 power supply module, the LIN transceiver is connected to an ICAS vehicle body end LIN signal module, the LIN transceiver, the second control circuit, the LDO circuit, and the CAN transceiver are all connected to an MCU microcontroller, the LIN transceiver is connected to the first control circuit, the first control circuit, the second control circuit, and the CAN transceiver are all connected to the LDO circuit, and the second control circuit, the LED drive circuit, and the LED are all connected to the DC-DC circuit. The utility model provides a system for a vehicle taillight ECU to enter a functional safety mode based on an MCU failure, and adds a safety mechanism to monitor the MCU and the MCU power supply module.

The invention relates to the technical field of vehicle charging sockets, in particular to a charging socket signal switching mode. According to the charging socket signal switching mode, a socket shell is included, an inner cavity of the socket shell is divided into a DC cavity and an AC cavity, a DC circuit board and an AC circuit board are connected with SMD thermistors respectively so as to measure the temperature of DC and AC power terminals, the DC circuit board and the AC circuit board are connected with multi-PIN connectors respectively, and multi-PIN contact pins are integrated in the socket shell. The two ends of the multi-PIN pin extend into the DC cavity and the AC cavity respectively and are connected with the multi-PIN connector of the DC circuit board and the multi-PIN connector of the AC circuit board in an inserted mode, so that a DC power terminal temperature signal is transmitted to the AC circuit board through the multi-PIN connector of the DC circuit board, the multi-PIN pin and the multi-PIN connector of the AC circuit board in sequence and led out through the low-voltage connector of the AC circuit board. Through a signal switching mode of integrating the PINs in the socket shell, the split type design of the AC cavity and the DC cavity can be realized, so that the assembling performance and the sealing reliability of the product are improved.

The intrinsically safe power supply comprises a safety isolation transformer, a fuse, a rectification filtering and reverse connection prevention circuit, a lightning protection circuit, a surge and overvoltage protection circuit, a DC / DC conversion circuit and a two-stage overcurrent and overvoltage protection circuit. An R-type safety isolation transformer is matched with a primary side fuse and a secondary side fuse to provide a reliable SELV power supply, a DC / DC circuit is formed based on an LM2676-ADJ chip, a two-stage over-current and over-voltage rapid turn-off protection circuit is formed through a surge protection chip ADM1270, and the nonlinear rectangular power supply output characteristic is provided. The two-stage TVS is arranged at the input end of the DC / DC circuit and the input end of the ADM1270 chip and matched with the fuse for protection, the fuse is fused under the condition that the input voltage is abnormal or the DC / DC fails, the overvoltage protection effect is achieved, and the safety of the chip and the reliability of the power supply are ensured.

The invention provides a vehicle-mounted charger control method and system and a vehicle controller, and is used for providing sweep frequency current required by electrochemical impedance spectroscopy detection for a power battery under the condition that a vehicle-mounted charger is not connected with an alternating current power grid. Acquiring target sweep frequency current information; and an isolation DC / DC circuit is driven according to the target sweep frequency current information, so that the sweep frequency current can flow bidirectionally between the intermediate bus capacitor and the power battery. According to the invention, the starting scene of the EIS detection function can be effectively expanded, and the EIS detection function is allowed to be started in the scene of not inserting a charging gun and a discharging gun or not connecting an in-vehicle alternating current load.

The utility model relates to a power supply circuit and a vehicle. The power supply circuit comprises a high-voltage battery, a DC / DC circuit and a storage battery. The output end of the high-voltage battery is connected with the input end of the DC / DC circuit, and the first output end of the DC / DC circuit is connected with an external load through the storage battery; and the second output end of the DC / DC circuit is connected with an external load. According to the utility model, the DC / DC circuit with one input and two outputs is arranged to convert the high voltage of the high-voltage battery into two low voltages, one low voltage supplies power to the load through the storage battery, and the other low voltage supplies power to the load directly, so that the normal power supply of the load when the high-voltage battery fails is ensured through the arranged storage battery; and double-power-supply power supply can be realized only through one storage battery, so that the power supply circuit realizes double-power-supply power supply with high function safety level and low cost.

The invention provides a method and system for detecting the health state of a storage battery for a transformer substation direct current system, and the method comprises the steps: obtaining first state data which comprises an access switch state of a battery pack, a closed-loop switch state between direct current buses, a voltage increment state of the battery pack, and a current increment state of the battery pack; determining the operation condition of the storage battery according to the first state data; according to the operation condition, collecting operation data including the boost rate, the charge increment, the charging duration and the discharging duration of the storage battery, calculating a health characteristic value HF of the storage battery under the corresponding condition according to the operation data, and obtaining second state data including the voltage V, the internal resistance R, the temperature T and the health characteristic value HF of the storage battery, and the SOH value diagnosis model generates an SOH value for determining the health state of the storage battery according to the second state data. The health state of the storage battery can be judged from multiple angles by combining the operation condition of the storage battery in the direct-current circuit, and the detection accuracy of the health state of the storage battery is improved.

A power stage circuit with multiple bidirectional AC to DC circuits for bidirectional charging is modified to connect the power stage converters in series for DC to AC applications. The power stage circuit can covert a DC input from a DC power source of a vehicle to an AC output for a power outlet of the vehicle. The power stage circuit uses two lines with a 120 VAC at the power outlet. Using a common neutral line, the AC to DC circuits are connected together to form a split phase power output, and the 120 VAC lines are 180 degrees out of phase to create a 240 VAC source at the power outlet.

The invention provides a millimeter wave directional diagram reconfigurable antenna and a reconfigurable method, and belongs to the technical field of wireless communication. A plurality of radiation structures are integrated on the same transmission line structure, and impedance regulation is performed by loading a control element on the antenna structure, so that one radiation structure is in a matched state, and the other radiation structures are in a mismatched state; time-domain reconfigurable collaborative excitation of a single feed structure on a plurality of radiation modes is realized; energy enters from the feed port and is radiated outwards through the radiation structure in the matched state. According to the invention, time-domain reconfigurable collaborative excitation of a single feed structure on a plurality of radiation modes can be realized; a plurality of modes can be freely and flexibly switched; a simple and compact direct-current circuit is provided; the stable radiation characteristic can be realized; the structure is compact, the integration level is high, the occupied space is small, and machining is easy; the antenna has relatively high gain and efficiency and relatively good working bandwidth; and the space coverage rate is relatively high.

The embodiment of the invention discloses a primary and secondary fusion pole-mounted switch self-adaptive energy supply system and method, and relates to the technical field of intelligent power distribution network equipment. The system comprises a capacitor electricity taking module located on the primary side of the primary and secondary fusion pole-mounted switch, and a super capacitor, a power management module, a storage battery, an energy management control unit and a DC-DC circuit which are located on the secondary side of the primary and secondary fusion pole-mounted switch. Dynamic coordination of two energy storage elements, namely a super capacitor and a storage battery, in a steady-state low-power-consumption monitoring and transient-state high-power driving scene is realized, energy distribution optimization, closed-loop charging guarantee and abnormal fault-tolerant design are combined, and the problems of high steady-state power consumption and insufficient transient-state driving capability existing in a traditional primary and secondary fusion pole-mounted switch power supply scheme are solved.

This invention relates to the field of DC circuit breakers, and discloses a thyristor-type DC circuit breaker and its control method. The DC circuit breaker structure is a thyristor T... m1 Anode-connected thyristor T m2 The cathode forms the A terminal of the circuit breaker, T m1 Cathode connection T m2 The anode of the thyristor forms the B terminal of the circuit breaker; the thyristor T p1 anode, thyristor T p2 The cathode is connected to terminal A; T p1 Cathode connection T p2 After anode, it passes through resistor R in sequence. g Switch RCB g Grounding; T p1 Cathode connection T p2 After the anode, it also passes through inductor L p Capacitor C is connected to terminal B; one end of the surge arrester MOV is connected to terminal T. p1 The cathode is connected to the first terminal, and the other end is connected to the B terminal. This invention has a simple structure and significant cost advantages; under normal operating conditions, only a single thyristor is conducting, resulting in extremely low losses and extremely high circuit breaker efficiency. Combined with control methods, it can actively and reliably connect or disconnect bidirectional operating current or bidirectional fault current; it can also achieve fast reclosing functionality.

The invention discloses a buffer circuit and method suitable for a hybrid direct-current circuit breaker and related equipment, and belongs to the technical field of hybrid direct-current circuit breakers. By arranging the buffer diode, the discharge current of the buffer capacitor is prevented from reversely flowing through the UFD, and the turn-off delay of the UFD is avoided; the buffer diode is connected with the charging branch in parallel, so that the charging voltage of the buffer capacitor is slowly increased, the turn-off loss is reduced, and the turn-off reliability of the hybrid direct-current circuit breaker is improved; the parallel connection of the buffer diode and the charge transfer branch can quickly transfer the energy stored in the buffer capacitor to the high-capacity capacitor after current conversion, thereby avoiding the obstruction of the buffer capacitor to the quick starting action of the UFD, reducing the energy loss in the charge transfer process through the introduction of the small-resistance resistor, and improving the efficiency of the UFD. Rapidity and high efficiency of charge transfer are ensured; the buffer diode is connected in parallel with the discharge branch and is used for controlling the discharge speed of the buffer capacitor so as to maintain stable operation of the circuit.