WO2023077982A1

WO2023077982A1 - Uninterruptible power supply system for neutral section passing of power-centralized motor train unit trailer

Info

Publication number: WO2023077982A1
Application number: PCT/CN2022/119841
Authority: WO
Inventors: 薛宏佺; 郁兆旺; 陈立; 贲晓东; 常江龙; 王春龙; 鲁洋; 赵红印; 高波; 闫龙
Original assignee: 中车南京浦镇车辆有限公司
Priority date: 2021-11-03
Filing date: 2022-09-20
Publication date: 2023-05-11
Also published as: CN114024362A

Abstract

The present invention relates to an uninterruptible power supply system for neutral section passing of a power-centralized motor train unit trailer, comprising an inverter, a trailer AC load, a charger, a storage battery pack, and an emergency power supply. Before a train passes through a neutral section, the total power of the trailer AC load is reduced, a train power supply is turned off, and electric energy of the storage battery pack is boosted by the emergency power supply and inverted by the inverter to supply power to the trailer AC load; after the train passes through the neutral section, the trailer AC load is switched to be powered by the train power supply, and storage batteries are charged by the train power supply to ensure uninterrupted power supply during next neutral section passing. By using the uninterruptible power supply control scheme of the present invention, the trailer can be not limited by the train running speed and the train power supply, and uninterrupted power supply for the trailer AC load during neutral section passing is achieved by the standby power supply of the trailer; moreover, in the event of a sudden failure of the train power supply of the locomotive, it can be ensured that important electric equipment of the trailer continues to run for a certain period of time, thereby reducing the failure rate caused by sudden power failure of the equipment, and improving the reliability and comfort of the train in operation.

Description

A kind of uninterrupted power supply system for over-phase separation of trailers of EMUs with centralized power

technical field

The invention belongs to the field of train over-phase separation control for centralized power trains, and in particular relates to a train over-phase uninterrupted power supply device and control method.

Background technique

Electric locomotives are generally used to provide DC600V power supply for the power supply of existing railway passenger cars or 160km centralized EMU trailers. The passenger cars or trailers are equipped with inverters to convert DC600V into AC380V power for the AC loads of the vehicles. When the train passes through the phase-splitting section, the locomotive adopts the separate main break, and stops supplying DC600V power to the passenger car or trailer, and then supplies power to the passenger car or trailer again after passing the phase-splitting section. Technical defects manifest in the following two aspects:

1. When the train passes through the phase separation zone, there is no AC power supply on the passenger car or trailer, and the air conditioning unit, oxygen generator, electric heater, kitchen equipment, etc. cannot work, which affects the comfort of the passenger car.

2. When the train is over-phased, the equipment on the passenger car or trailer frequently starts and stops working, which reduces the service life of the equipment and increases the failure rate.

The search found that the Chinese invention patent application CN201510944835.7 discloses a device and method for reusing the train's phase-splitting energy, and the Chinese invention patent application CN201480024964.8 discloses a control method for the auxiliary winding without power failure when the railway train is over-phased.

The schemes recorded in the above two documents all use the motor, controller, auxiliary winding and other devices to convert the kinetic energy of the vehicle into electrical energy to supply power to the train when the phase is over.

This method is limited by the running speed of the train. When the train enters the phase-separation zone, the higher the train speed, the greater the kinetic energy, and the greater the generated electric energy. Electricity demand, the first type is suitable for the speed grade greater than 200km/h power decentralized EMU trains. The second method can only meet the power demand of the locomotive itself, and the voltage generated when the train speed is low is unstable, the power supply quality is poor, and the phase-splitting section cannot supply power to passenger cars or trailers.

The maximum operating speed of existing railway passenger cars or 160km concentrated power EMUs is less than 160km/h, and some sections run at 80-120km/h, and the speed is lower when the speed is limited by line conditions. Due to the limitation that the passenger car itself has no auxiliary circuit, the power supply is provided centrally by the locomotive, and due to the low speed grade, the electric energy generated by the conversion of kinetic energy is not enough to meet the electricity demand of the whole train when the phase is separated.

Contents of the invention

The purpose of the present invention is mainly to address the defects of the above-mentioned prior art, and to provide a kind of uninterrupted power supply system for the trailers of the concentrated power EMU. .

In order to solve the above technical problems, the power centralized EMU trailer vehicle over-phase uninterrupted power supply system provided by the present invention includes an inverter and a trailer AC load, and is characterized in that it also includes a charger, a battery pack and an emergency power supply. Reduce the total power of the trailer's AC load before the phase phase, cut off the column power supply, and the electric energy of the battery pack is boosted by the emergency power supply and inverted by the inverter to supply power to the trailer's AC load; The battery is powered by the power supply, and the storage battery is charged by the column power supply to ensure uninterrupted power supply when the phase zone is crossed next time.

Further, the over-phase uninterrupted power supply system for the centralized EMU trailer also has an integrated control cabinet, the integrated control cabinet receives the over-phase warning signal sent by the EMU, and controls the work of the charger, the emergency power supply and the inverter State, the working state is divided into normal working condition and uninterrupted power supply working condition.

Further, the inverter has two input lines, wherein the first input line is connected to the power supply main line that provides the column power supply, and the second input line is connected to the emergency power supply, and the first input line is provided with a main contactor; Under normal working conditions, the main contactor is closed, and under uninterrupted power supply conditions, the main contactor is disconnected. Under normal working conditions, the emergency power supply is hot-backed; under uninterrupted power supply conditions, the output power of the emergency power supply. In this patent, the output voltage of the emergency power supply is lower than the rated voltage of the column power supply.

The emergency power supply is always connected with the battery. Under normal working conditions, the emergency power supply output voltage DC570V is in the hot standby state and does not output external power. In the uninterrupted power supply state, the emergency power supply supplies power to the inverter with DC570V.

The present invention also claims to protect a method for controlling the uninterrupted power supply of the trailer of the concentrated power EMU, which is characterized in that it is realized by the aforementioned system.

Specifically, the control method for the uninterrupted power supply control of the trailer of the power concentrated EMU over-split phase includes the control step of entering the over-split phase and the control step of over-split phase completion, wherein

Step 1.1, before the EMU is about to enter the phase separation area, send out an over-phase separation warning signal;

Step 1.2. After the integrated control cabinet receives the phase-separation warning signal, reduce the total power of the AC load of the trailer, and control the working state of the charger and inverter to switch from normal working condition to uninterrupted power supply working condition;

Step 1.3, the charger blocks the pulse and stops working; the emergency power supply boosts the output voltage of the battery pack, and the emergency power supply is automatically put into power supply from the hot standby state; when it is detected that the column supply voltage is lower than the preset voltage threshold, it is disconnected The main contactor on the first input line of the inverter;

Step 1.4, the electric energy of the battery pack is boosted by the emergency power supply and inverted by the inverter to supply power to the AC load of the trailer;

The control steps for over-phase completion are as follows:

Step 2.1. After detecting that the column supply voltage has returned to normal, close the main contactor on the first input line of the inverter, and send out a phase-over completion signal;

Step 2.2, control the working state of the charger and the inverter to switch from the uninterrupted power supply condition to the normal condition;

Step 2.3: The AC load of the trailer resumes normal operation; the charger starts normally; when the voltage of the column power supply is greater than the voltage of the emergency power supply, the emergency power supply automatically exits the power output and enters the hot standby state; the power of the main power supply is converted by the inverter Powers the trailer AC load.

In the present invention, the trailer is equipped with a charger, a battery pack, and an inverter for emergency power supply. When the train is approaching the phase-splitting area, the locomotive sends an over-phase-separation warning signal to the trailer in advance, and the trailer control system reduces the load in advance before the phase-separation zone, and shuts down the train. For some non-important AC loads, the power is reduced, and the trailers realize uninterrupted power supply through the battery pack, emergency power supply and inverter.

The beneficial effects of the present invention are: adopting the uninterrupted power supply control scheme of the present invention, the trailer can not be restricted by the running speed of the train and the train power supply, and realize the high-power AC loads such as the trailer's air conditioner, oxygen system, and kitchen electrical equipment through the trailer's own backup power supply Uninterrupted power supply in the case of excessive phase separation, and at the same time, when the locomotive power supply suddenly fails, it can also ensure that the important electrical equipment of the trailer continues to run for a certain period of time, reducing the failure rate caused by sudden power failure of the equipment and improving the reliability of train operation. sex, comfort.

Description of drawings

Fig. 1 is a composition block diagram of the power centralized EMU trailer over-phase uninterrupted power supply system of the present invention.

Fig. 2 is a schematic diagram of the uninterrupted power supply system for the trailer of the concentrated power EMU according to the present invention.

Detailed ways

Embodiments of the present invention are explained below.

As shown in Fig. 1, the power centralized EMU trailer of the embodiment of the present invention is divided into phase uninterrupted power supply systems, including an integrated control cabinet 4, an inverter 8, a trailer AC load 9, a charger 5, a storage battery pack 6 (DC110V) and an emergency Power supply 7 (used to convert the DC110V power supply to about DC570V output), reduce the total power of the trailer AC load 9 before the train is over-phased, cut off the train power supply, and the electric energy of the battery pack 6 is boosted and inverted by the emergency power supply 7 The inverter 8 supplies power to the trailer AC load 9 after inverting; after the over-phase division is completed, switch to the column power supply for power supply. The rated voltage of the column power supply is DC600V, the rated output voltage of the emergency power supply is DC570V, and the two circuits for the inverter are connected in parallel after being isolated by diodes. The over-phase separation process automatically transfers to the emergency power supply after the column power supply fails to achieve uninterrupted operation. Therefore, the key innovation point of this invention is: the two DC circuits are connected in parallel by using the voltage difference, and the one with the higher voltage is always powered during the operation process to realize uninterrupted operation. The emergency power supply and the battery are always connected in the working state, that is, the hot standby state.

The integrated control cabinet 4 distributes the train power supply (DC600V, taking power from the main power supply line 3), receives the over-phase split warning signal sent by the EMU, and controls the working status of the charger 5 and the inverter 8. The working status is divided into For normal working conditions and uninterrupted power supply working conditions.

Wherein, the inverter 8 has two input lines, wherein the first input line is connected to the main power supply line 3 providing the column power supply through a diode, the second input line is connected to the emergency power supply 7, and the first input line is provided with a main contact Under normal working conditions, the main contactor is closed, and under uninterrupted power supply conditions, the main contactor is opened. The emergency power supply 7 is always connected with the battery pack 6. Under normal working conditions, the emergency power supply output voltage DC570V is in the hot standby state and does not output external power. In the uninterrupted power supply state, the emergency power supply supplies power to the inverter with DC570V.

The method for controlling the uninterrupted power supply of the trailers of the EMU with centralized power is realized through the system of this embodiment. Specifically, it includes the control step of entering the transition phase and the control step of the completion of the transition phase, where

The control steps to enter the over-phase separation are as follows:

Step 1.2, after the integrated control cabinet 4 receives the phase-separation warning signal, reduce the total power of the trailer AC load 9, and control the working state of the charger 5, the emergency power supply 7 and the inverter 8 to switch from the normal working condition to the uninterruptible power supply. condition;

Step 1.3, the charger 5 blocks the pulse and stops working; the emergency power supply 7 boosts the output voltage of the battery pack 6, and the emergency power supply 7 is automatically put into power supply from the hot standby state; when it is detected that the column supply voltage is lower than the preset voltage threshold , disconnect the main contactor on the first input line of the inverter 8; in this embodiment, the preset voltage threshold is set to 500V;

Step 1.4, the electric energy of the battery pack 6 is boosted by the emergency power supply 7 and inverted by the inverter 8 to supply power to the AC load 9 of the trailer.

The control steps for over-phase completion are as follows:

Step 2.1, after detecting that the column supply voltage returns to normal, close the main contactor on the first input line of the inverter 8, and send out a phase-over completion signal;

Step 2.2, control the working state of the charger 5, the emergency power supply 7 and the inverter 8 from the uninterrupted power supply working condition to the normal working condition;

Step 2.3, the trailer AC load 9 resumes normal operation; the charger starts normally; when the voltage of the column power supply is greater than the voltage of the emergency power supply 7, the emergency power supply 7 automatically exits the power output and enters the hot standby state; the electric energy of the power supply trunk 3 is converted The inverter 8 supplies power to the trailer AC load 9 after inverting.

The following is a detailed description of the uninterrupted power supply of the oxygen system compressor for the important load of the power centralized EMU trailer. The power centralized EMU adopts the centralized power supply of the power car (DC600V), and the power supply mode of the trailer is decentralized and variable. Each trailer is equipped with a DC110V battery. group, DC600V/DC110V charger, DC110V/DC600V emergency power supply, DC600V/AC380V inverter.

The control principle of each equipment is shown in Figure 2. When the power concentrated EMU passes the phase separation zone, the catenary is powered off, the power vehicle stops supplying power, and the trailer control system disconnects the normal AC load of the vehicle in advance according to the power vehicle’s over-phase separation warning signal. , the battery pack of the vehicle supplies power to the important AC loads of the vehicle through the emergency power supply and the inverter module to ensure that the compressor of the oxygen generation system runs uninterrupted when the phase is over.

When the inverter power supply detects that the input DC600V voltage is between DC500-DC660V, inverter module 1 and inverter module 2 close the main contactor and start precharging the precharging capacitor inside the inverter. After the precharging is completed, it starts with VVVF. After the inverter module starts up normally, inverter module 1 sends out 201 signal (inverter module 1 is normal), 205 signal (over-phase split completion signal), and inverter module 2 sends out 301 signal (inverter module 2 is normal). When the inverter diagnoses a fault, it blocks the pulse, disconnects the main contactor, pre-charging contactor, and output contactor, and sends a 301 signal (inverter module 1 fault) or 303 signal (inverter module 2 fault).

When the charger detects that the input DC600V voltage is between DC500-DC660V, it closes the main contactor to start pre-charging, and after the pre-charging is completed, it starts soft starting. After the start-up is completed, a 202 signal is issued (the charger is normal). When the charger diagnoses a fault, the pulse is blocked, the main contactor is disconnected, and a 302 signal (charger fault) is sent.

After the emergency power supply receives the 205 signal sent by the inverter 1, when the battery voltage is >90V, it will switch to the hot standby state. The output voltage tracks the column supply DC600V power supply voltage, the control output voltage is 30V lower than the column supply voltage, and the output voltage is determined to be DC570V, which is in hot standby state. After the output voltage of the emergency power supply is greater than DC500V, a 431 signal (emergency power supply is normal) and a 450 signal (hot standby state) are issued. When the emergency power supply fails, a 432 signal (emergency power supply failure) is issued.

The emergency power supply will stop when one of the following conditions is met:

a. Immediately shut down after receiving the fault signal of the charger of the vehicle (the fault signal of the charger is not responded to in emergency mode);

b. Immediately stop the vehicle after receiving the load reduction signal from the inverter of the vehicle;

c. There is no power supply and there is no emergency power supply mode signal, the duration of the running time is tentatively 90s, and the machine will stop after 90s;

d. The input voltage undervoltage is less than 86V and stops immediately.

3 seconds before the EMU enters the phase-separation zone, the power car sends out an automatic over-phase-separation warning signal (the time from the warning to the disconnection of DC600V is about 3s):

1) The oxygen generation system implements load reduction, and the load after load reduction is 55% of the rated load.

2) After the charger receives the 772 signal (automatic over-phase split warning signal), it blocks the pulse and disconnects the main contactor and pre-charging contactor.

3) After the emergency power supply receives the 772 signal (automatic phase separation warning signal), it switches to the uninterrupted power supply state, and the output voltage is controlled according to DC570V.

4) After the inverter power supply receives the 450 signal, it enters the uninterrupted power supply state. When it detects that the DC600V voltage of the column supply is lower than 500V, it disconnects the main contactor and the pre-charging contactor, and the control board continues to control the output of 3AC380V to maintain oxygen production. machine compressor power supply.

After the EMU leaves the phase-splitting area, the DC600V power supply is used to start:

1) When the inverter power supply detects that the input DC600V voltage is between DC500-DC660V, it closes the main contactor and the pre-charging contactor, and sends out a 205 signal (signal of completion of over-phase division).

2) The emergency power supply, charger, and oxygen generator receive the 205 signal from the inverter power supply (signal of over-phase completion), and perform the following actions:

①Emergency power supply - switch to hot standby state.

②Oxygen generator—the oxygen generator compressor resumes normal operation.

③Charger—start normally.

In addition to the above-mentioned embodiments, the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

An uninterrupted power supply system for an EMU trailer with centralized power, including an inverter (8) and an AC load (9) for the trailer, and is characterized in that it also includes a charger (5), a battery pack (6) and an emergency power supply (7), reduce the total power of the trailer AC load (9) before the train crosses the phase, cut off the train power supply, and the electric energy of the battery pack (6) is boosted by the emergency power supply (7) and reversed by the inverter (8) Power is supplied to the trailer AC load (9) in the rear; after the over-phase is completed, the trailer AC load (9) is switched to the column power supply for power supply.
According to claim 1, the uninterrupted power supply system for over-phase separation of trailers of concentrated power EMUs is characterized in that: it also has an integrated control cabinet (4), and the integrated control cabinet (4) receives the over-phase pre-warning signal sent by the EMU , and control the working state of the charger (5) and the inverter (8), the working state is divided into a normal working condition and an uninterrupted power supply working condition.
According to claim 2, the uninterrupted power supply system for trailers of concentrated power EMUs is characterized in that: the inverter (8) has two input lines, wherein the first input line is connected to the main power supply line (3) that provides the column power supply ), the second input line is connected to the emergency power supply (7), and the first input line is provided with a main contactor; under normal working conditions, the main contactor is closed; under uninterrupted power supply conditions, the main contactor is off open.
According to claim 3, the uninterrupted power supply system for the trailer of the centralized power multiple train unit is characterized in that: under normal working conditions, the emergency power supply (7) is used for heat backup; under uninterrupted power supply conditions, the emergency power supply (7) Output Power.
According to claim 4, the uninterrupted power supply system for the trailers of concentrated power EMUs, characterized in that the output voltage of the emergency power supply (7) is lower than the rated voltage of the train power supply.
The method for controlling the uninterrupted power supply of the trailer of the EMU with centralized power, which is characterized in that it is realized by the system described in any one of claims 1-5.
The method for controlling the uninterrupted power supply of the trailer of the concentrated power EMU according to claim 6, characterized in that it includes the control step of entering the transition phase and the control step of completing the transition phase, wherein,

The control steps to enter the over-phase separation are as follows:

Step 1.1, before the EMU is about to enter the phase separation area, send out an over-phase separation warning signal;

Step 1.2. After the integrated control cabinet (4) receives the phase-separation warning signal, it reduces the total power of the trailer's AC load (9), and controls the working state of the charger (5) and inverter (8) to switch from normal to non-working conditions. Intermittent power supply conditions;

Step 1.3, the charger (5) blocks the pulse and stops working; the emergency power supply (7) boosts the output voltage of the battery pack (6), and the emergency power supply (7) is automatically put into power supply from the hot standby state; When the column supply voltage is lower than the preset voltage threshold, disconnect the main contactor on the first input line of the inverter (8);

Step 1.4, the electric energy of the battery pack (6) is boosted by the emergency power supply (7) and reversed by the inverter (8) to supply power to the AC load (9) of the trailer.
According to claim 7, the power centralized EMU trailer vehicle over-phase uninterrupted power supply control method is characterized in that:

The control steps for over-phase completion are as follows:

Step 2.1, after detecting that the column supply voltage returns to normal, close the main contactor on the first input line of the inverter (8), and send out a phase-over completion signal;

Step 2.2, control the working state of the charger (5) and the inverter (8) from the uninterrupted power supply working condition to the normal working condition;

Step 2.3, the trailer AC load (9) resumes normal operation; the charger starts normally; when the voltage of the column power supply is greater than the voltage of the emergency power supply (7), the emergency power supply (7) automatically exits the power output and enters the hot standby state; the main power supply The electric energy of (3) supplies power to the trailer AC load (9) after being inverted by the inverter (8).
The method for controlling the uninterrupted power supply of the trailers of the power centralized EMU according to claim 8, wherein the rated voltage of the train power supply is 600V, and in step 1.3, the value range of the preset voltage threshold is 480V-520V.