23 results about "Braking chopper" patented technology

The disclosure is directed to a brake chopper, a control board, a bus voltage control method, a device and a medium. The brake chopper may include a resistor module, electrically connected to a DC bus to form an energy release circuit of the DC bus; a control module, for determining the difference between a voltage value of the DC bus and a preset first threshold, and generating a first switch control signal on the basis of the difference; and a switch module, for controlling the ON time of the energy release circuit on the basis of the first switch control signal. There may be a progressively increasing relationship between the ON time and the difference. The ON time of the energy release circuit may be precisely controlled based on the difference between 10 the DC bus voltage value and the first threshold, increasing the energy utilization rate of the DC bus.

A DFIG wind power facility configured to be operated during grid faults is provided. The wind power facility includes a Doubly-Fed Induction Generator, a control system, an electric converter, a short-circuit controlled switch to selectively short-circuit the stator and a Stator Neutral Brake Chopper coupled to the stator. The DFIG includes a rotor and a stator, the stator including at least one three-phase winding. The electric converter includes a Machine Side Converter, a Grid Side Converter and a DC link connected therebetween. The SNBC includes a three-phase rectifier including three inputs, an impedance and an active high-frequency switch configured to vary the average value of the impedance by adjusting its duty cycle; each of the three inputs of the rectifier is connected to a phase of the at least one three-phase winding of the stator. Methods for operating a DFIG wind power facility during grid faults are also provided.

In a method for operating a drive system, and drive system, having a rectifier and at least one inverter including an electric motor, the electric motor is connected at the AC-voltage-side connection of the inverter, the DC-voltage-side connection of the inverter is connected via inductance(s) in addition to the line inductance, to the DC-voltage-side connection of the rectifier, a capacitance is connected at the DC-voltage-side connection of the inverter and / or at the DC-voltage-side connection of the rectifier, a series circuit, including a resistor and a controllable semiconductor switch is connected at the DC-voltage-side connection of the inverter and / or at the DC-voltage-side connection of the rectifier, the braking chopper being operated using a single frequency during the particular time span in which the braking chopper is in operation, the frequency, e.g., being set apart from the resonant frequency of the resonant circuit including the inductance or the capacitances.

A propulsion controller includes a controller that performs mode switching control and power consumption control, on the basis of a filter capacitor voltage and a main motor speed. The mode switching control switches between an asynchronous mode and a synchronous mode. The power consumption control causes power consumption resistor of a brake chopper circuit to consume regenerative power generated when a main motor operates as a generator. The controller controls an operating point, depending on the position of which the asynchronous mode and the synchronous mode are switched, to a desired position by changing a target value of the filter capacitor voltage controlled by the power consumption control.

The present disclosure relates to systems, methods, controllers and computer program products for thermal management of a brake chopper resistor. The system comprises a resistor housing portion configured to receive a cooling fluid in a cooling fluid flow path; a brake chopper resistor in the resistor housing portion; a plurality of temperature sensors in thermal communication with different respective parts of the resistor cooling flow path through the resistor housing portion and configured to measure a first temperature at a first location in the cooling fluid flow path of the brake chopper resistor and to measure a second temperature at a second location in the cooling fluid flow path of the brake chopper resistor; and control logic, configured to compare the first temperature and / or the second temperature to a threshold value or to compare the first temperature with the second temperature, and to make a determination of whether to allow activation of the brake chopper resistor in response to the comparison with the threshold value.

The application relates to the technical field of energy management, and provides an energy storage voltage stabilizer for a high-power multi-motor servo system and a control method thereof, which comprises a main motor driver, an energy storage motor driver, a braking chopper and braking resistor unit, a controller and a rectifier, a soft start circuit and a common DC bus connected in sequence; a bidirectional voltage-lifting converter is arranged on the common DC bus, the high-voltage side of the bidirectional voltage-lifting converter is connected in parallel with the positive bus end and the negative bus end of the common DC bus, and the low-voltage side of the bidirectional voltage-lifting converter is connected with an energy storage unit; the input ends of the main motor driver and the energy storage motor driver are connected in parallel with the positive bus end and the negative bus end of the common DC bus; the braking chopper and the braking resistor unit are connected across the positive bus end and the negative bus end of the common DC bus; the controller is used for controlling the charging and discharging power of the bidirectional voltage-lifting converter and controlling the conduction of the braking chopper and the braking resistor unit. Energy waste is avoided.

This application provides an ice-melting circuit for an urban rail train and the urban rail train itself. The urban rail train includes a current collector, a traction system, and an axle-end grounding device; the traction system includes a traction converter, a traction motor, and a braking resistor; the traction converter has an ice-melting mode; wherein, under the control of the traction controller, the traction converter activates the ice-melting mode. When the ice-melting mode is activated, the braking chopper bridge of the traction converter is turned on, enabling the braking resistor to be activated, and there is no current conduction between the braking resistor and the traction motor, so that the third rail powered by the current collector, the current collector, the braking chopper bridge of the traction converter, the braking resistor, the axle-end grounding device, and the track form an ice-melting circuit. This application solves the technical problem of high initial capital investment in traditional rail train de-icing methods.

To make further effective use of regenerative electric power.SOLUTION: This electric drive vehicle comprises: a battery; a DC / DC converter that receives an input of an output voltage of the battery; an inverter that drives a motor by receiving a voltage output from the DC / DC converter or a voltage input from an overhead wire; a brake chopper device connected to the DC side of the inverter; and an overhead wire load determination device that determines whether the overhead wire needs a load for consuming the power on the basis of a voltage detection value of the DC side of the inverter and a current detection value of current flowing through the overhead wire from the inverter.SELECTED DRAWING: Figure 1

A power conversion device (2) comprises: a power conversion circuit (100A) for executing AC / DC power conversion between AC circuits (20, 3) of a power grid (1) and a DC circuit (9); a braking chopper (10); and a control circuit (30) for the braking chopper (10). The braking chopper (10) includes a series circuit of a switch (11) and an energy absorber (12) and is configured to consume the energy of the connection destination of the braking chopper (10) through energization of the energy absorber (12) during the ON period of the switch (11). The control circuit (30) variably controls the duty ratio during the ON period of the switch (11) in accordance with a power consumption command value based on the inflow power to the power conversion circuit (100A) and / or the outflow power from the power conversion circuit during a braking chopper (10) operation period corresponding to the occurrence of a disturbance in the power grid (1).

In a method for operating a drive system and a drive system for carrying out a method, the electric motor is connected to the AC-side connection of an inverter, the DC-side connection of the inverter is connected to the DC-side connection of the rectifier via an inductance, a capacitance is connected to the DC-side connection of the inverter, a series circuit formed from a resistor and a braking chopper is connected to the DC-side connection of the inverter, and the braking chopper is operated with a pulse width modulation frequency, which is determined by a pseudo-random number generator.

A circuit includes first, second, third, and fourth power switches in series to form a first branch in parallel with a second branch comprising first and second capacitors in series with a first node therebetween. A first brake resistor is in series with a first chopper switch to form a third branch, and a second brake resistor is in series with a second chopper switch to form a fourth branch. The third branch is between a terminal of the first capacitor and a second node between the first and second power switches. The second and third power switches have a third node therebetween. The fourth branch is between a terminal of the second capacitor and a fourth node between the third and fourth power switches. A third capacitor and / or an inductor forms a fifth branch between (i) the second and fourth node, or (ii) the first and third node.

The invention provides a distributed permanent magnet direct drive-based multi-motor efficient cooperative traction controller and a control method. The multi-motor efficient cooperative traction controller comprises a main circuit, a control circuit and a multi-motor efficient cooperative control algorithm module, the main circuit comprises extensible traction, brake chopping, excitation and DC-DC modules, and the control circuit is provided with a multi-protocol gateway board, a traction / excitation main control board, a fault recording board and a back board; and the traction main control board operates wheel diameter difference dynamic identification, torque cooperative distribution and line-vehicle coupling optimization algorithms to eliminate idling / sliding caused by the wheel diameter difference in real time and adaptively correct traction force under a complex line. Through wheel diameter difference dynamic identification and a line vehicle coupling optimization algorithm, on an integrated hardware platform integrating traction, excitation and braking functions, millisecond-level cooperative torque distribution is carried out on the distributed permanent magnet direct drive multiple motors, so that wheel idling sliding and invalid traction are eliminated, and efficient and energy-saving operation under all working conditions is achieved.

A circuit includes a first power switch, a second power switch, a third power switch, and a fourth power switch in series to form a first branch in parallel with a second branch, the second branch including a first capacitor and a second capacitor in series with a first node between the first capacitor and the second capacitor. A first brake resistor is connected in series with the first chopper switch to form a third branch, and a second brake resistor is connected in parallel with the second chopper switch to form a fourth branch. The third branch is located between the terminal of the first capacitor and a second node, which is located between the first power switch and the second power switch. A third node is arranged between the second power switch and the third power switch. The fourth branch is located between the terminal of the second capacitor and a fourth node, which is located between the third power switch and the fourth power switch. The third capacitor and / or inductor forms a fifth branch between (i) the second node and the fourth node or (ii) the first node and the third node.

The embodiment of the invention discloses a brake chopper, a control panel, a bus voltage control method, equipment and a medium. The brake chopper comprises a resistor module which is electrically connected with a direct current bus to form an energy discharge loop of the direct current bus; the control module is used for determining a difference value between the voltage value of the direct current bus and a preset first threshold value, and generating a first switch control signal based on the difference value; and the switch module is used for controlling the conduction time of the energy discharge loop based on the first switch control signal, and the conduction time and the difference value have an increasing relationship. The conduction time of the energy discharge loop is precisely controlled based on the difference value between the voltage value of the DC bus and the first threshold value, and the energy utilization rate of the DC bus is improved. The brake chopper is onboard, and the installation space and the assembly cost are reduced. When the temperature of the resistor module is too high, the energy discharge loop is disconnected to provide protection. Multiple switch protection is realized through the multi-stage field effect transistors, and the safety is improved.

The invention relates to a method for the intelligent heating of a fuel cell system (1), wherein a heat required for heating a fuel cell system (1) integrated in a vehicle (2) to an operating temperature is provided by a secondary brake system (3) of the vehicle (2) in the form of at least one retarder (3.1) and / or a brake chopper (3.2), The invention is characterized in that a planned journey is carried out with the vehicle (2), wherein the vehicle (2) switches from battery-electric operation to a fuel cell operating mode at a switchover time during the journey, in which a drive energy required to drive the vehicle (2) is provided by the fuel cell system (1), wherein an analysis of the planned journey is carried out before the start of the journey in order to determine an amount of heat which can be drawn from the secondary braking system (3) during a period of the journey, and wherein the switchover time is determined as a function of the amount of heat which can be drawn and / or heating of the fuel cell system (1) is started before the start of the journey in order to ensure that the fuel cell system (1) has reached the operating temperature when the switchover time is reached.

A vehicle, in particular a two-wheeler or three-wheeler. The vehicle includes at least one electric motor which is provided for decelerating the vehicle and / or at least one vehicle wheel of the vehicle during a braking operation, and at least one vehicle battery which is functionally coupled to the electric motor. The vehicle has a braking chopper unit which is operatively connected to the electric motor and the vehicle battery, has at least one braking resistor, and is provided for dissipating excess energy generated by the electric motor during the braking operation.

A drive device for a railway vehicle operates by receiving power supply from an alternating-current overhead contact line or a three-phase generator. The drive device for a railway vehicle is configured such that a voltage output from a main transformer is applied to alternating-current input ends in a converter circuit via a first switch. A first phase voltage among voltages output from the three-phase generator is applied to an alternating-current input end in a first leg of a brake chopper circuit via a second switch. Second and third phase voltages among the voltages output from the three-phase generator are applied to the alternating-current input ends, respectively, via the second switch.

The invention relates to a three-level brake chopper comprising a first controllable semiconductor switch (T1) connected between a positive direct current pole (dc+) and a first connection point, a second controllable semiconductor switch (T2) connected between the first connection point and a neutral direct current pole (NP), a third controllable semiconductor switch (T3) connected between the neutral direct current pole (NP) and a second connection point, a fourth controllable semiconductor switch (T4) connected between the second connection point and a negative direct current pole (dc-), a resistance arrangement (Rbrk) connected between the first connection point and the second connection point, and a control arrangement (11) configured to, in response to detecting a fault in the resistance arrangement (Rbrk), control the second controllable semiconductor switch (T2) and the third controllable semiconductor switch (T3) into a conducting state.

The purpose of the present invention is to make more effective use of regenerative electric power. This electrically driven vehicle comprises a battery, a DC / DC converter which accepts the output voltage of the battery as an input, an inverter which accepts the voltage output from the DC / DC converter or the voltage from overhead wires as an input to drive an electric motor, and a brake chopper device which is connected to the DC side of the inverter, and the electrically driven vehicle is provided with an overhead wire load determiner which determines whether there is a load consuming power on the overhead wires or not on the basis of a detected voltage value on the DC side of the inverter and a detected current value of a current flowing from the inverter to the overhead wires.

The embodiment of the invention discloses a pulse charging and discharging circuit, system and method, the pulse charging and discharging circuit comprises a power supply, an energy storage circuit, a charging and discharging circuit and a load which are cascaded in sequence, the energy storage circuit comprises a plurality of synchronous BUCK modules, and each synchronous BUCK module comprises a step-down branch composed of two MOS discrete devices and an energy storage inductor; the charging and discharging circuit comprises two brake choppers which are connected in parallel. By adopting the embodiment of the invention, the problems of low efficiency, poor heat dissipation capability, poor reliability and the like of a traditional high-power pulse current source which is controlled in a linear mode can be solved.

The embodiment of the invention provides a brake chopper circuit and method. The circuit comprises a first driving circuit and a second driving circuit which are electrically connected; wherein the first driving circuit comprises a first motor and a first motor controller which are electrically connected; the second driving circuit comprises a second motor, a second motor controller, a three-phase contactor, a contactor module and a brake chopping resistor module; the first end of the three-phase contactor is connected with the second motor controller, and the second end of the three-phase contactor is connected with the second motor; one end of the contactor module is connected with the second end of the three-phase contactor, and the other end is connected with the brake chopping resistor module; the brake chopping resistor module is used for consuming electric energy generated by the first driving circuit when the contactor module is closed. By means of the brake chopper circuit, the brake energy chopper consumption function is achieved, relevant controllers and cooling loops do not need to be independently configured, and cost is saved.

The power conversion device (2) includes a power conversion circuit (100A) for performing AC-DC power conversion of the AC circuit (20, 3) and the DC circuit (9) of the power system (1), a braking chopper (10), and a control circuit (30) of the braking chopper (10). The braking chopper (10) includes a series circuit of a switch (11) and an energy absorber (12), and is configured to consume the energy at the connection destination of the braking chopper (10) by energizing the energy absorber (12) during the ON period of the switch (11). The control circuit (30) variably controls the duty ratio of the ON period of the switch (10) according to a power consumption command value based on at least one of the power flowing into the power conversion circuit (100A) and the power flowing out of the power conversion circuit during the operation period of the braking chopper (10) in response to the occurrence of a disturbance in the power system (1).

The invention provides a control method and system for preventing overvoltage of an intermediate capacitor when a train passes through a non-power zone, and the method comprises the steps: S1, monitoring the running speed of the train in real time, and executing S2 when the speed is lower than a preset threshold value and a traction system diagnoses an undervoltage fault; s2, detecting whether the voltage of the intermediate capacitor reaches a chopping opening threshold or not in the network voltage recovery process, and if yes, executing S3; and S3, opening a brake chopper tube and starting a time control mechanism, including single chopping opening time and accumulated chopping time in the whole process from undervoltage to network voltage recovery, and performing parallel judgment in the chopping process: when the single chopping time exceeds first allowable time or the accumulated chopping time exceeds second allowable time, immediately closing the chopper tube. Through a dual-time control mechanism, overvoltage of the intermediate capacitor is effectively prevented under the condition that the brake resistor does not have forced air cooling, smooth transition of a system from a non-power area to a power area is ensured, and the overvoltage protection problem caused by forbidding of a micro-brake function under the low-speed working condition is solved.