A control method for dual high-voltage units of four-unit intercity EMU

Abstract

The present invention sets a traction control unit for the whole vehicle, and the traction control unit sets a CCU. The CCU is connected to two sets of high-voltage units. The CCU automatically selects an available pantograph according to the pantograph status of the two high-voltage units, and controls the available pantograph to rise. After the main breaker is closed, the CCU controls the main circuit breaker under the raised pantograph to close. During the operation of the whole vehicle, the control and protection of the high-voltage equipment are all completed by a CCU. The present invention reduces one CCU in the whole vehicle, saves the number of equipment, reduces costs, cancels the train-level data bus, and simplifies the network system topology.

Description

Technical Field

[0001] The invention relates to a rail vehicle high-voltage unit control technology, and in particular to a dual-high-voltage unit control method for a four-car intercity EMU. Background Art

[0002] The high-voltage unit system of the EMU is designed based on the 25KV power supply system. The high-voltage system of the EMU consists of two high-voltage units. Each high-voltage unit mainly consists of pantographs, main circuit breakers, lightning arresters, current transformers, voltage sensors, roof disconnectors, high-voltage cables, insulators and other equipment. The pantograph is installed on the roof of the transformer car and is responsible for taking power from the contact network. Below the pantograph is a voltage sensor for measuring the network voltage. The main circuit breaker under the lightning arrester is integrated with a grounding switch. The main circuit breaker is driven by compressed air to control whether the high voltage received from the pantograph is connected to the main transformer. A current transformer is connected between the main circuit breaker and the main transformer to measure the primary current of the main transformer. There is a high-voltage line on the roof between the two transformer cars, which is used to connect the two high-voltage units of the EMU, so that one pantograph and one main circuit breaker can power two traction units at the same time.

[0003] At present, the EMUs in existing projects are equipped with two sets of high-voltage units. When the EMU is operating normally, only one set of high-voltage units is working, and the other set of high-voltage units is on standby. TCMS is divided into two traction control units, each with a CCU. Each high-voltage unit is controlled by the CCU of the half train, and the CCUs of the two half trains exchange information through the train-level data bus. Summary of the invention

[0004] The purpose of the present invention is to provide a control method for dual high-voltage units of a four-unit intercity EMU, in which the whole vehicle is a traction control unit, and both sets of high-voltage units are controlled by one CCU, which saves the number of network devices and simplifies the network system topology.

[0005] In order to solve the above technical problems, the present invention provides a control method for dual high-voltage units of a four-unit intercity EMU, wherein the whole vehicle is provided with a traction control unit, the traction control unit is provided with a CCU, and the CCU is connected to two sets of high-voltage units, comprising the following steps:

[0006] Step 1: Determine whether there is a fault in the high-voltage system. If so, output an instruction to open the high-voltage isolating switch, and simultaneously open the high-voltage isolating switches of the two high-voltage units; if not, the CCU outputs an instruction to close the high-voltage isolating switch, and simultaneously closes the high-voltage isolating switches of the two high-voltage units;

[0007] Step 2: operate the pantograph raising key, the CCU selects the pantograph to be raised, and outputs a raising command to the pantograph, and the pantograph is raised;

[0008] Step 3: Operate the main breaker closing button, and the CCU outputs a closing command to the main breaker under the raised pantograph. At the same time, the CCU performs a protection function on the high-voltage equipment, and the pantograph enters the working state;

[0009] Step 4: Operate the main breaker switch to disconnect the main breaker. The CCU outputs a disconnect command to the closed main breaker, and the main breaker is disconnected.

[0010] Step 5: Operate the pantograph lowering button. The CCU outputs a pantograph lowering command to the raised pantograph, and the pantograph is lowered.

[0011] Furthermore, the CCU selects the pantograph to be raised according to the position of the occupied end, giving priority to raising the pantograph far from the occupied end. If the pantograph far from the occupied end has been cut off or fails before the operation of raising the pantograph, the pantograph close to the occupied end is selected.

[0012] The present invention has the following advantages and progress over the prior art:

[0013] (1) The present invention reduces one CCU in the vehicle, saves equipment and reduces costs;

[0014] (2) The present invention eliminates the train-level data bus and simplifies the network system topology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the control method of the dual high-voltage unit of the four-unit intercity EMU of the present invention. DETAILED DESCRIPTION

[0016] Reference Figure 1 The present invention provides a traction control unit for the whole vehicle, the traction control unit provides a CCU, the CCU is connected to two sets of high-voltage units, and the control method of the dual high-voltage units of the four-set intercity EMU includes the following steps:

[0017] Step 1: Initially determine whether there is a fault in the high-voltage system

[0018] When there is a fault in the high-voltage system, the CCU outputs an instruction to open the high-voltage isolating switch, and at the same time opens the high-voltage isolating switches of each of the two high-voltage units, entering the S1 state; when the high-voltage system is normal, the CCU outputs an instruction to close the high-voltage isolating switch, and at the same time closes the high-voltage isolating switches of each of the two high-voltage units, entering the S0 state.

[0019] Step 2: After operating the pantograph raising key, enter the L0 branch, and the CCU will give priority to raising the rear pantograph according to the position of the occupied end. Take the occupation of the driver's cab at end 1 as an example: if the driver's cab at end 1 is occupied, give priority to raising the rear pantograph, that is, the pantograph of car 3. If the pantograph of car 3 has been cut off or malfunctioned before the operation of raising the pantograph, select the front pantograph to be raised, that is, the pantograph of car 2. If the driver's cab at end 4 is occupied, give priority to raising the rear pantograph, that is, the pantograph of car 2. If the pantograph of car 2 has been cut off or malfunctioned before the operation of raising the pantograph, select the front pantograph to be raised, that is, the pantograph of car 3. Select the pantograph to be raised and enter the S2 state; and output the raising command to the pantograph to enter the S3 state.

[0020] Step 3: After operating the main breaker button, enter the L1 branch, and the CCU outputs a closing command to the main breaker under the raised pantograph and enters the S4 state; at the same time, the CCU executes the protection function for the high-voltage equipment and enters the S5 state.

[0021] Step 4: After the main breaker button is disconnected, the L2 branch is entered, and the CCU outputs a disconnect command to the closed main breaker and enters the S6 state.

[0022] Step 5: After operating the pantograph lowering button, enter the L3 branch, and the CCU outputs a pantograph lowering command to the raised pantograph, entering the S7 state.

[0023] When there is no high voltage fault in the train, the CCU controls the two high voltage disconnectors to close. When there is a high voltage fault, the CCU controls the two high voltage disconnectors to open. According to the pantograph status of the two high voltage units, the CCU automatically selects the available pantograph and controls the available pantograph to rise. After the main breaker is closed, the CCU controls the main circuit breaker under the raised pantograph to close. During the operation of the whole vehicle, the control and protection of the high voltage equipment are all completed by a CCU.

Claims

1. A control method for dual high-voltage units of a four-unit intercity EMU, characterized in that: The vehicle is provided with a traction control unit, the traction control unit is provided with a CCU, and the CCU is connected to two sets of high-voltage units, including the following steps: Step 1: Determine whether there is a fault in the high-voltage system. If so, output an instruction to open the high-voltage isolating switch, and simultaneously open the high-voltage isolating switches of the two high-voltage units; if not, the CCU outputs an instruction to close the high-voltage isolating switch, and simultaneously closes the high-voltage isolating switches of the two high-voltage units; Step 2: operate the pantograph raising key, the CCU selects the pantograph to be raised, and outputs a raising command to the pantograph, and the pantograph is raised; Step 3: Operate the main breaker closing button, and the CCU outputs a closing command to the main breaker under the raised pantograph. At the same time, the CCU performs a protection function on the high-voltage equipment, and the pantograph enters the working state; Step 4: Operate the main breaker switch to disconnect the main breaker. The CCU outputs a disconnect command to the closed main breaker, and the main breaker is disconnected. Step 5: Operate the pantograph lowering button. The CCU outputs a pantograph lowering command to the raised pantograph, and the pantograph is lowered.

2. The control method of a dual high-voltage unit of a four-unit intercity EMU according to claim 1 is characterized in that: CCU selects the pantograph to be raised based on the location of the occupied end, giving priority to raising the pantograph far from the occupied end. If the pantograph far from the occupied end has been cut off or fails before the operation of raising the pantograph, the pantograph close to the occupied end will be selected.

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