CN210007407U

CN210007407U - DC3000V energy feeding device

Info

Publication number: CN210007407U
Application number: CN201920870180.7U
Authority: CN
Inventors: 胡顺全; 吴建华; 丁宁; 邵景红; 刘丽敏; 姬脉胜; 亢丽平; 冯玉豹; 石爱茹
Original assignee: SHANDONG XINFENGGUANG ELECTRONIC TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: SHANDONG XINFENGGUANG ELECTRONIC TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-01-31
Anticipated expiration: 2029-06-11

Abstract

The utility model discloses a device can be presented to DC3000V, including converter, transformer, master control and cable, the secondary side winding of transformer connects on the alternating current network, the converter comprises the DC-to-ac converter of m series connection, be provided with m secondary side winding on the secondary side of transformer, be connected with m secondary winding of transformer respectively, every inverter comprises n parallelly connected power unit mutually, every power unit all is connected with the unit control who carries out control to its rectification and inversion state, the master control controls every power unit's state through the unit control ware, the utility model discloses a device can be presented to DC3000V, and the series connection between the inverter of existing grades, power unit's parallelly connected in also having every grades of inverters, voltage-sharing control between the inverter of grades and the current-sharing control between every grades of inverters internal power unit have guaranteed the utility model discloses a device can be presented to DC3000V the reliable operation of stable.

Description

DC3000V energy feeding device

Technical Field

The utility model relates to a device can be presented to kinds of DC3000V, more specifically says, especially relates to kind can present the device with DC3000V of inputting to the electric wire netting after the energy contravariant that produces when the train brakes.

Background

When a train is regeneratively braked, the electric working condition of a traction motor is converted into a power generation working condition, the kinetic energy of the train is converted into electric energy, most of the electric energy is fed back to a direct-current traction network except part of the electric energy which is consumed by auxiliary power equipment of the regenerative train, if other trains in the same power supply section are towed at the moment, the regenerative energy on the direct-current traction network is absorbed, when the train is dispatched, the regenerative energy is not absorbed by the traction train or cannot be completely absorbed, the rest part of the energy can cause the voltage of the traction network to be rapidly raised, when the network voltage exceeds a limit value, the regenerative braking must be cut off in order to protect the safety of the vehicle equipment, so that the regenerative failure occurs.

At present, a train regenerative energy absorption device mainly comprises a resistance energy consumption type, an energy storage type and an inversion feedback type, and from the energy-saving data and the operation condition of the current operation line, the resistance type device is not a good choice, and the energy storage type device has no successful and stable operation experience. A reasonable inversion feedback type regenerative braking energy absorption device is installed in a traction power supply system to absorb and recycle energy generated by train braking, so that the aims of saving energy, reducing emission and stabilizing the voltage of a power grid are fulfilled.

The DC3000V is mature power supply systems internationally, a DC3000V power supply line is adopted in the trunk line electrified railways of countries in the former Soviet Union and European regions at present, the rail transit direct current traction power supply system in the early domestic period adopts a DC750V voltage system, the newly built city adopts a DC1500V voltage system, and the two voltage systems have the problems of small power supply capacity and transmission distance and serious stray current corrosion compared with the DC3000V voltage system.

Disclosure of Invention

The utility model discloses a overcome above-mentioned technical problem's shortcoming, it can present the device to provide kinds of DC 3000V.

The utility model discloses a device can be presented to DC3000V, including converter, transformer, master control and cable, secondary side winding of transformer connects on the alternating current net, its characterized in that, the converter comprises the DC-to-ac converter of m series connections, the direct current side of head end DC-to-ac converter is connected with the positive pole of direct current traction net through the cable, the direct current side of terminal DC-to-ac converter is connected with the negative pole of direct current traction net through the cable, be provided with m secondary side windings on the secondary side of transformer, the alternating current side of m DC-to-ac converter is connected with m secondary winding of transformer respectively, every inverter comprises n power unit that connect in parallel, every power unit all is connected with the unit controller that controls its rectification and contravariant state, the master control is controlled every power unit's state through the unit controller.

The utility model discloses a device can be presented to DC3000V, power unit is the three-phase full-bridge that 6 IGBT constitute, three single-phase reactor of three-phase full-bridge connection or three-phase reactor.

The utility model discloses a device can be presented to DC3000V, and the same power unit of serial number divides into group in the m DC-to-ac converter, and the power unit in the same group adopts electric current closed loop control.

The utility model discloses a device can be presented to DC3000V, the quantity m of inverter = 4.

The beneficial effects of the utility model are that the utility model discloses a DC3000V can present the device, establish ties between the DC-to-ac converter of both levels in the converter, also has the parallelly connected of the inside power unit of every level DC-to-ac converter, and voltage-sharing control between the DC-to-ac converter of all levels and the current-sharing control between the inside power unit of every level DC-to-ac converter have guaranteed the utility model discloses a DC3000V can present the reliable and stable operation of device, the utility model discloses compatible with DC3000V direct current traction power supply system, absorb the produced energy of train braking and recycle, reach energy saving and emission reduction and the purpose of stabilizing grid voltage, power unit's structure is the same, and interchangeability is good, and the structure is compacter, and easy to.

Drawings

Fig. 1 is a schematic circuit diagram of a DC3000V energy feeding device of the present invention;

fig. 2 is a circuit diagram of each inverter of the present invention;

fig. 3 is a circuit diagram of the middle power unit of the present invention;

fig. 4 is a schematic diagram of the current closed-loop control of the group 1 power unit in the DC3000V power supply apparatus according to the present invention.

In the figure: the method comprises the following steps of 1 converter, 2 transformer, 3 inverter, 4 power unit and 5 main control.

Detailed Description

The present invention will be described in further with reference to the following drawings and examples.

As shown in fig. 1, the circuit schematic diagram of the DC3000V energy feeding device of the present invention is provided, which is composed of an inverter 1 and a transformer 2, the winding on the secondary side of the transformer 2 is connected to the ac network, the inverter 1 is composed of m (4 in the figure) inverters 3 connected in series, the 4 inverters 3 in the figure are respectively labeled INV1, INV2, INV3 and INV4, the DC side of the inverter INV1 at the head end is connected to the positive pole of the DC traction network, the DC side of the inverter INV4 at the tail end is connected to the negative pole of the DC traction network, the number of the winding on the secondary side of the transformer 2 is m (4 in the figure), the 4 secondary side windings of the transformer 2 in the figure are respectively connected to the ac side of the 4 inverters 3, thus, the DC voltage on the train DC traction network is converted into ac power after the inversion processing of each inverter, and then is input to the ac network through the transformer 2, thereby realizing the recycling of energy.

As shown in fig. 2, the utility model discloses in the circuit diagram of every inverter, every inverter 3 shown comprises a plurality of parallelly connected power Unit 4 of n, and the reference numeral of a plurality of power Unit is Unit _1, Unit _2, … …, Unit _ n respectively, and fig. 3 has given the utility model discloses in power Unit's circuit diagram, every power Unit 4 is the three-phase full-bridge that 6 IGBTs are constituteed, three single-phase reactor or three-phase reactor of three-phase full-bridge connection, like this, existing a plurality of inverter 3's series connection in the converter 1, have the parallelly connected of a plurality of power Unit 4 in every inverter 3 again, voltage-sharing control between the inverter at different levels and the current-sharing control between the inside power Unit of every level inverter are the important assurance of the stable reliable operation of device.

All power units are grouped, when the power units are grouped, each -stage corresponding power Unit is divided into groups, namely Unit _1 of INV1, Unit _1 of INV2, Unit _1 of INV3 and Unit _1 of INV4 are group 1, Unit _2 of INV1, Unit _2 of INV2, Unit _2 of INV3 and Unit _2 of INV4 are group 2, Unit _ n of INV1, Unit _ n of INV2, Unit _ n of INV3 and Unit _ n of INV4 are group n, each group is controlled by an independent current closed loop, current equalization among the groups can be achieved, and power Unit equalization inside each stage of inverter can be achieved.

The voltage-sharing control principle is that when power is output (energy is transferred from a direct current side to an alternating current side), the output power of the power unit with the relatively high direct current bus voltage is relatively high due to the fact that the control signals of the IGBTs are the same, the direct current bus voltage can be automatically reduced to with other power units, and when power is input, the process is opposite, and the direct current bus voltage among the power units can also automatically keep balance.

The specific implementation method for implementing n groups of independent current closed loops, and using the same IGBT control signal inside each group is, as shown in fig. 4, forming n control loops between the master and n groups, and the control mode of each loop is the same, as explained with reference to group 1, as shown in fig. 4, the present invention provides a current closed loop control schematic diagram of group 1 power Unit in the DC3000V feeder, the master automatically detects the signal of each sensor (including DC voltage, ac voltage and phase on the ac grid), generates a corresponding control command, and transmits the command to the Unit controller of Unit _1 of INV1, the Unit controller of Unit _1 of INV1 receives the control command from the master and collects the output current of group 1 to perform current closed loop control, generates a control signal of group 1 IGBT, and transmits the signal and the state information of Unit _1 of INV 28 (including the protection information of temperature, current, etc. of power Unit) to the Unit controller of Unit _1 of INV2, the Unit 2 of Unit INV1 transmits the state information of Unit _1 to the Unit controller of INV _1, and finally transmits the status information of INV _1, INV _1 to form Unit 465, INV2, INV _ 4936, Unit 465, Unit controller, and finally transmits the status information received by Unit controller.

The units in the control loop all acquire IGBT control signals generated by Unit _1 of INV1, automatic voltage sharing of the four-stage Unit can be realized, the current closed loop adopted by Unit _1 of INV1 is independent of the current closed loops of other n-1 groups, the control commands are the same as commands generated by main control, the final output currents are basically the same, and current sharing of power units connected in parallel in each -stage inverter can be realized.

Claims

The energy feed device for the DC3000V of 1 and comprises a converter (1), a transformer (2), a main control unit (5) and cables, wherein a secondary side winding of the transformer is connected to an alternating current network, the energy feed device is characterized in that the converter is composed of m inverters (3) connected in series, a direct current side of a first-end inverter is connected with a positive electrode of a direct current traction network through the cables, a direct current side of a tail-end inverter is connected with a negative electrode of the direct current traction network through the cables, m secondary side windings are arranged on a secondary side of the transformer, alternating current sides of the m inverters are respectively connected with the m secondary windings of the transformer, each inverter is composed of n power units (4) connected in parallel, each power unit is connected with a unit controller for controlling rectification and inversion states of the power unit, and the main control unit controls the states of each power unit through the unit controller.
2. The DC3000V energy feeding device according to claim 1, wherein the power unit (4) is a three-phase full bridge of 6 IGBTs, the three-phase full bridge is connected with three single-phase reactors or three-phase reactors.
3. The DC3000V energy feeding device according to claim 1 or 2, wherein the power cells with the same number in the m inverters (3) are divided into groups, and the power cells in the same groups are controlled by current closed loop.
4. The DC3000V energy feed device of claim 1 or 2, wherein: the number m =4 of the inverters (3).