A device for suppressing the failure of train regenerative braking and its control method

Abstract

The present invention provides a device for suppressing train regenerative braking failure and its control method, which relates to the technical field of power quality control in electrified railways. The DC sides of two single-phase converters are connected in parallel with an energy storage device and a support capacitor, and the AC sides are respectively connected in parallel with the loads of their respective supply arms; the measurement and control unit obtains the traction network terminal voltage and feeder current of the two supply arms through voltage transformers and current transformers to control the energy storage device and the two single-phase converters in real time. With the main goal of suppressing train regenerative braking failure, when the terminal voltage of the supply arm exceeds the normal range, the measurement and control unit controls the converter and the energy storage device to reduce the terminal traction network voltage by balancing the loads of the two supply arms at both ends of the section, storing regenerative braking energy and absorbing inductive reactive power, thereby suppressing train regenerative braking failure.

Description

Technical Field

[0001] The present invention relates to the field of electrified railways, and particularly to the field of power quality control technology for electrified railways. Background Art

[0002] Ensuring the power quality of electrified railways is an important condition for ensuring the safe operation of electric locomotives. However, at the end of the power supply arm of some lines, the voltage level has become the primary problem restricting the power quality.

[0003] With the continuous development of power electronic AC drive technology, China has basically completed the upgrade from DC-AC electric locomotives to AC-DC-AC electric locomotives. AC-DC-AC electric locomotives can adopt regenerative braking, feedback the regenerative braking energy, which can be absorbed by adjacent locomotives or fed back to the three-phase power grid. However, on some lines, almost the entire power supply arm is on a long and steep slope, and most of the electric locomotives on the power supply arm are in the regenerative braking condition, with a large amount of regenerative braking energy, resulting in the increase of the voltage at the end of the power supply arm, exceeding the maximum allowable voltage of the electric locomotive, and the regenerative braking fails. The train has to cut off the regenerative braking. In addition, too much regenerative braking energy fed back to the power grid will also cause a certain impact on it.

[0004] For some high-speed or heavy-haul lines, the current taken by the locomotive is large and the power-on probability is high, resulting in a low voltage at the end of the power supply arm, which affects the normal current taking of the locomotive.

[0005] For a converter, it can transfer both active power and reactive power. Therefore, when the energy storage device is fully charged or has a low power level, the converter can be used to transfer reactive power to stabilize the voltage at the end of the power supply arm.

[0006] Chinese Patent Publication No. "A Control Method for a Comprehensive Power Quality Treatment Device for Electrified Railways (201210417779.X)" aims to "achieve the comprehensive treatment of negative sequence, harmonics and reactive power in electrified railways, and appropriately reduce the active capacity to improve the treatment effect and reduce the cost". The purpose of this patent is to suppress the regenerative braking failure of the train and support the network voltage. Although there are some similarities in structure, the control methods and purposes are different.

[0007] The present invention proposes an energy storage device for electrified railways that can suppress the regenerative failure of the train, achieve stable voltage at the end of the power supply arm, and also take into account absorbing the regenerative braking energy. Summary of the Invention

[0008] The purpose of the present invention is to provide a device for suppressing the regenerative braking failure of the train, which can effectively solve the problem of the regenerative braking failure of the train caused by the too high voltage at the end of the power supply arm, and can also support the voltage at the end, take into account the load balance of the power supply arms at both ends of the section post, and improve the technical problem of the utilization rate of the regenerative braking energy.

[0009] Another object of the present invention is to provide a control method for a train regenerative braking failure suppression device, which can effectively solve the problem of train regenerative braking failure caused by excessive voltage at the end of the power supply arm, can also support the end voltage, take into account the load balance of the power supply arms at both ends of the section post, and improve the technical problem of the utilization rate of regenerative braking energy.

[0010] The object of the present invention is achieved by the following technical solutions: A train regenerative braking failure suppression device includes an energy storage device, a support capacitor, converter a, converter b, and a measurement and control unit. A feeder a with a current transformer is arranged at the head end of the power supply arm of traction substation a, and a converter is arranged at the end of catenary a. The AC side of the converter is respectively connected to the catenary and the rail. The AC side of converter a is respectively connected to the middle of catenary a and the rail, and the DC side is connected in parallel with the energy storage device and the support capacitor; a voltage transformer a is arranged at the end of catenary a; A feeder b with a current transformer is arranged at the head end of the power supply arm of traction substation b, and a converter is arranged at the end of catenary b. The AC side of converter b is respectively connected to the end of catenary b and the rail, and the DC side is connected in parallel with the energy storage device and the support capacitor; a voltage transformer b is arranged at the end of catenary b; The measurement terminals of current transformer a, the measurement terminal of current transformer b, and the measurement terminal of voltage transformer b are all connected to the input interface of the measurement and control unit, and the output interface of the measurement and control unit is connected to the control terminals of the energy storage device, converter a, and converter b; The measurement and control unit obtains the end voltage of the power supply arm and the feeder current in real time through current transformer a, current transformer b, voltage transformer a, and voltage transformer b, and controls the working states of the energy storage device, converter a, and converter b in real time.

[0011] Another object of the present invention is achieved by the following technical solutions: A control method for a train regenerative braking failure suppression device, assuming that the current traction at feeder a and feeder b is positive and the regeneration is negative; the power supply arm where catenary a is located is power supply arm a, and the power supply arm where catenary b is located is power supply arm b; then there are the following six states:

[0012] (A), When the end voltage of power supply arm a is greater than the maximum allowable voltage of the power supply arm, and at the same time the end voltage of power supply arm b is greater than the maximum allowable voltage of the power supply arm, and the energy storage device has space to store electrical energy, the measurement and control unit controls converter a and converter b to rectify, and the energy storage device stores electrical energy to reduce the end voltage of catenary a; If the energy storage device is saturated with stored electrical energy, the measurement and control unit controls converter a and converter b to absorb inductive reactive power to reduce the end voltage of catenary a;

[0013] (B) When the voltage at the end of power supply arm a is less than the minimum allowable voltage of the power supply arm, and at the same time the voltage at the end of power supply arm b is less than the minimum allowable voltage of the power supply arm, and the energy storage device meets the condition for releasing electric energy, the measurement and control unit controls the inverter of converter a and converter b, and the energy storage device releases electric energy to increase the voltage at the end of catenary b; if the electric energy of the energy storage device has been completely released, the measurement and control unit controls converter a and converter b to absorb capacitive reactive power to increase the voltage at the end of catenary b;

[0014] (C) When the voltage at the end of power supply arm a is greater than the maximum allowable voltage of the power supply arm, and at the same time the voltage at the end of power supply arm b < the maximum allowable voltage of the power supply arm: if the current of feeder a + the current of feeder b ≥ 0, the measurement and control unit controls converter a to rectify and converter b to invert, and all the regenerative braking energy is transferred from power supply arm a to power supply arm b; if the current of feeder a + the current of feeder b < 0, the measurement and control unit controls converter a to rectify and the energy storage device stores electric energy. If the energy storage device is already saturated, the measurement and control unit controls converter a to absorb inductive reactive power;

[0015] (D) When the voltage at the end of power supply arm b is greater than the maximum allowable voltage of the power supply arm, and at the same time the voltage at the end of power supply arm a is less than the maximum allowable voltage of the power supply arm: if the current of feeder a + the current of feeder b ≥ 0, then the measurement and control unit controls converter b to rectify and converter a to invert, and all the regenerative braking energy is transferred from power supply arm b to power supply arm a; if the current of feeder a + the current of feeder b < 0, then the measurement and control unit controls converter b to rectify and the energy storage device stores electric energy. If the energy storage device is already saturated, then the measurement and control unit controls converter b to absorb inductive reactive power;

[0016] (E) When the voltage at the end of power supply arm a is less than the minimum allowable voltage of the power supply arm and the voltage at the end of power supply arm b is normal, the measurement and control unit controls converter a to invert, and the energy storage device releases electric energy to power supply arm a; if the electric energy of the energy storage device has been completely released, then the measurement and control unit controls converter a to invert and converter b to rectify, and power supply arm b shares part of the load of power supply arm a;

[0017] (F) When the voltage at the end of power supply arm b is less than the minimum allowable voltage of the power supply arm and the voltage at the end of power supply arm a is normal, the measurement and control unit controls converter b to invert, and the energy storage device releases electric energy to power supply arm b; if the electric energy of the energy storage device has been completely released, then the measurement and control unit controls converter b to invert and converter a to rectify, and power supply arm a shares part of the load of power supply arm b.

[0018] When the terminal voltages of both power supply arms are at normal levels: When the current of feeder a + the current of feeder b is greater than the reference value, and the current of feeder a is greater than the current of feeder b, the measurement and control unit controls the inverter of converter a, and the energy storage device releases electrical energy; When the current of feeder a + the current of feeder b is greater than the reference value, and the current of feeder a is less than the current of feeder b, the measurement and control unit controls the inverter of converter b, and the energy storage device releases electrical energy; When the current of feeder a + the current of feeder b is less than the reference value, converter a, converter b, and the energy storage device standby.

[0019] The basic working principle of the present invention is: By measuring the terminal voltages of the two power supply arms and the feeder currents, controlling the working states of the converters and the energy storage device, to achieve the effect of suppressing the failure of the train's regenerative braking, making the terminal voltage of the power supply arm within the normal range, and taking into account the utilization of the regenerative braking energy.

[0020] Assume that the current traction at feeder a and feeder b is positive, and the regeneration is negative; The reference value is obtained from the historical traction load current. Take the average value of the traction load current under normal working conditions in the past as the reference value, with traction being positive and regenerative braking being negative.

[0021] The power supply arm where catenary a is located is power supply arm a, and the power supply arm where catenary b is located is power supply arm b; When the terminal voltage of power supply arm a is greater than the maximum allowable voltage of the power supply arm, and at the same time the terminal voltage of power supply arm b is greater than the maximum allowable voltage of the power supply arm, and the energy storage device can still store electrical energy, the measurement and control unit controls converter a and converter b to rectify, and the energy storage device stores electrical energy to reduce the terminal voltage of the power supply arm; If the energy storage device can no longer store electrical energy, the measurement and control unit controls converter a and converter b to absorb inductive reactive power to reduce the terminal voltage of the power supply arm. When the terminal voltage of power supply arm a < the minimum allowable voltage of the power supply arm, and at the same time the terminal voltage of power supply arm b is less than the minimum allowable voltage of the power supply arm, and the energy storage device has the condition to release electrical energy, the measurement and control unit controls converter a and converter b to invert, and the energy storage device releases electrical energy to increase the terminal voltage of the power supply arm; If the energy storage device can no longer release electrical energy, the measurement and control unit controls converter a and converter b to absorb capacitive reactive power to increase the terminal voltage of the power supply arm.

[0022] When the voltage at the end of power supply arm a is greater than the maximum allowable voltage of the power supply arm, while the voltage at the end of power supply arm b is less than the maximum allowable voltage of the power supply arm: If the current of feeder a + the current of feeder b ≥ 0, the measurement and control unit controls converter a to rectify and converter b to invert, and all the regenerative braking energy is transferred from power supply arm a to power supply arm b; If the current of feeder a + the current of feeder b < 0, the measurement and control unit controls converter a to rectify, and the energy storage device stores electric energy. If the energy storage device can no longer store electric energy, the measurement and control unit controls converter a to absorb inductive reactive power. When the voltage at the end of power supply arm b is greater than the maximum allowable voltage of the power supply arm, while the voltage at the end of power supply arm a is less than the maximum allowable voltage of the power supply arm: If the current of feeder a + the current of feeder b ≥ 0, the measurement and control unit controls converter b to rectify and converter a to invert, and all the regenerative braking energy is transferred from power supply arm b to power supply arm a; If the current of feeder a + the current of feeder b < 0, the measurement and control unit controls converter b to rectify, and the energy storage device stores electric energy. If the energy storage device can no longer store electric energy, the measurement and control unit controls converter b to absorb inductive reactive power.

[0023] When the voltage at the end of power supply arm a is less than the minimum allowable voltage of the power supply arm and the network voltage of power supply arm b is normal, the measurement and control unit controls converter a to invert, and the energy storage device releases electric energy to power supply arm a; If the energy storage device can no longer release electric energy, the measurement and control unit controls converter a to invert and converter b to rectify, and power supply arm b shares part of the load of power supply arm a; When the voltage at the end of power supply arm b < the minimum allowable voltage of the power supply arm and the network voltage of power supply arm a is normal, the measurement and control unit controls converter b to invert, and the energy storage device releases electric energy to power supply arm b; If the energy storage device can no longer release electric energy, the measurement and control unit controls converter b to invert and converter a to rectify, and power supply arm a shares part of the load of power supply arm b. When the voltages at the ends of both power supply arms are at normal levels: When the current of feeder a + the current of feeder b is greater than the reference value and the current of feeder a is greater than the current of feeder b, the measurement and control unit controls converter a to invert, and the energy storage device releases electric energy; When the current of feeder a + the current of feeder b is greater than the reference value and the current of feeder a < the current of feeder b, the measurement and control unit controls converter b to invert, and the energy storage device releases electric energy; When the current of feeder a + the current of feeder b < the reference value, converters a, b and the energy storage device are in standby.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] First, the train regenerative braking failure suppression device is located at the end of the power supply arm, effectively absorbing the train regenerative braking energy, effectively suppressing the possible regenerative failure caused by the elevation of the power supply arm voltage during the train's regenerative braking at the end of the power supply arm, and improving and enhancing the train operation safety.

[0026] Second, it can transfer the regenerative braking energy to the adjacent power supply arm, or absorb part of the train regenerative braking energy, improving the utilization rate of the train regenerative braking energy.

[0027] III. When the voltage at the end of the power supply arm is too low, it can play a certain supporting role in the voltage at the end of the power supply arm.

[0028] IV. The control method of the present invention is simple and reliable, and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0030] Figure 2 is a schematic diagram of the connection relationship of the measurement and control unit in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0032] Figure 1 As shown, a specific embodiment of the present invention is: a train regenerative braking failure suppression device, including an energy storage device 1, a support capacitor 2, a converter a3, a converter b4, and a measurement and control unit 14; a current transformer 6 is provided at the head feeder a5 of the power supply arm of traction substation a15, a converter 3 is provided at the end of the catenary a11, the AC side of the converter 3 is respectively connected to the catenary a11 and the rail 13, the AC side of the converter a3 is respectively connected to the middle of the catenary a11 and the rail 13, and the DC side is connected in parallel with the energy storage device 1 and the support capacitor 2; a voltage transformer a9 is provided at the end of the catenary a11; a current transformer 8 is provided at the head feeder b7 of the power supply arm of traction substation b16, a converter 4 is provided at the end of the catenary b12, the AC side of the converter b4 is respectively connected to the end of the catenary b12 and the rail 13, and the DC side is connected in parallel with the energy storage device 1 and the support capacitor 2; a voltage transformer b10 is provided at the end of the catenary b12.

[0033] Figure 2 is a schematic diagram of the connection relationship of the measurement and control unit in the embodiment of the present invention. The measurement ends of the current transformer a6, the current transformer b8, the voltage transformer a9, and the voltage transformer b10 are all connected to the input interface of the measurement and control unit 14, and the output interface of the measurement and control unit 14 is connected to the control ends of the energy storage device 1, the converter a3, and the converter b4; the measurement and control unit 14 obtains the voltage at the end of the power supply arm and the feeder current in real time through the current transformer a6, the current transformer b8, the voltage transformer a9, and the voltage transformer b10, and controls the working states of the energy storage device 1, the converter a3, and the converter b4 in real time.

[0034] Assume that the current traction at feeder a and feeder b is positive and the regeneration is negative, and take the average value of the feeder current under normal working conditions in the past as the reference value. The power supply arm where the catenary a is located is power supply arm a, and the power supply arm where the catenary b is located is power supply arm b.

[0035] The standard for the electrified railway power supply system and its power quality control technology states that "for the bus voltage on the 27.5 kV side of the traction transformer, a bus voltage greater than 29 kV or less than 20 kV is considered an unqualified voltage". Therefore, the maximum allowable voltage of the supply arm is 29 kV, and the minimum allowable voltage of the supply arm is 20 kV.

[0036] (A) When the voltage at the end of supply arm a is greater than the maximum allowable voltage of 29 kV of the supply arm, and at the same time the voltage at the end of supply arm b is greater than the maximum allowable voltage of 29 kV of the supply arm, and the energy storage device 1 has space to store electrical energy, the measurement and control unit 14 controls the converter a3 and the converter b4 to rectify, and the energy storage device 1 stores electrical energy to reduce the voltage at the end of the catenary a11; if the energy storage device 1 is saturated with stored electrical energy, the measurement and control unit 14 controls the converter a3 and the converter b4 to absorb inductive reactive power to reduce the voltage at the end of the catenary a11;

[0037] (B) When the voltage at the end of supply arm a is less than the minimum allowable voltage of 20 kV of the supply arm, and at the same time the voltage at the end of supply arm b is less than the minimum allowable voltage of 20 kV of the supply arm, and the energy storage device 1 has the condition to release electrical energy, the measurement and control unit 14 controls the converter a3 and the converter b4 to invert, and the energy storage device 1 releases electrical energy to increase the voltage at the end of the catenary b12; if the electrical energy of the energy storage device 1 has been completely released, the measurement and control unit 14 controls the converter a3 and the converter b4 to absorb capacitive reactive power to increase the voltage at the end of the catenary b12;

[0038] (C) When the voltage at the end of supply arm a is greater than the maximum allowable voltage of 29 kV of the supply arm, and at the same time the voltage at the end of supply arm b is less than the maximum allowable voltage of 29 kV of the supply arm: if the current of feeder a + the current of feeder b ≥ 0, the measurement and control unit 14 controls the converter a3 to rectify and the converter b4 to invert, and all the regenerative braking energy is transferred from supply arm a to supply arm b; if the current of feeder a + the current of feeder b < 0, the measurement and control unit 14 controls the converter a3 to rectify, and the energy storage device 1 stores electrical energy. If the energy storage device is saturated, the measurement and control unit 14 controls the converter a3 to absorb inductive reactive power.

[0039] (D) When the voltage at the end of supply arm b is greater than the maximum allowable voltage of 29 kV of the supply arm, and at the same time the voltage at the end of supply arm a is less than the maximum allowable voltage of 29 kV of the supply arm: if the current of feeder a + the current of feeder b ≥ 0, then the measurement and control unit 14 controls the converter b3 to rectify and the converter a4 to invert, and all the regenerative braking energy is transferred from supply arm b to supply arm a; if the current of feeder a + the current of feeder b < 0, then the measurement and control unit 14 controls the converter b3 to rectify, and the energy storage device 1 stores electrical energy. If the energy storage device is saturated, then the measurement and control unit 14 controls the converter b3 to absorb inductive reactive power;

[0040] (E) When the voltage at the end of power supply arm a is less than the minimum allowable voltage of 20 kV of the power supply arm and the voltage at the end of power supply arm b is normal, the measurement and control unit 14 controls the inverter of converter a3, and the energy storage device 1 releases electrical energy to power supply arm a; if the electrical energy of the energy storage device 1 has been completely released, the measurement and control unit 14 controls the inverter of converter a3 and the rectifier of converter b4, and power supply arm b shares part of the load of power supply arm a;

[0041] (F) When the voltage at the end of power supply arm b is less than the minimum allowable voltage of 20 kV of the power supply arm and the voltage at the end of power supply arm a is normal, the measurement and control unit 14 controls the inverter of converter b3, and the energy storage device 1 releases electrical energy to power supply arm b; if the electrical energy of the energy storage device 1 has been completely released, the measurement and control unit 14 controls the inverter of converter b3 and the rectifier of converter a4, and power supply arm a shares part of the load of power supply arm b.

[0042] When the voltages at the ends of both power supply arms are at normal levels: when the current of feeder a5 + the current of feeder b7 is greater than the reference value and the current of feeder a5 is greater than the current of feeder b7, the measurement and control unit 14 controls the inverter of converter a3 and the energy storage device 1 releases electrical energy; when the current of feeder a5 + the current of feeder b7 is greater than the reference value and the current of feeder a5 is less than the current of feeder b7, the measurement and control unit 14 controls the inverter of converter b4 and the energy storage device 1 releases electrical energy; when the current of feeder a5 + the current of feeder b7 is less than the reference value, converter a3, converter b4 and the energy storage device 1 are on standby.

Claims

1. A control method for a train regenerative braking failure suppression device, which includes a train regenerative braking failure suppression device composed of an energy storage device (1), a support capacitor (2), a converter a (3), a converter b (4), and a measurement and control unit (14). A current transformer a (6) is set at the head feeder a (5) of the power supply arm of traction substation a (15). A converter a (3) is set at the end of catenary a (11). The AC side of converter a (3) is respectively connected to catenary a (11) and the rail (13), and the DC side is connected in parallel with the energy storage device (1) and the support capacitor (2). A voltage transformer a (9) is set at the end of catenary a (11). A current transformer b (8) is set at the head feeder b (7) of the power supply arm of traction substation b (16). A converter b (4) is set at the end of catenary b (12). The AC side of converter b (4) is respectively connected to the end of catenary b (12) and the rail (13), and the DC side is connected in parallel with the energy storage device (1) and the support capacitor (2). A voltage transformer b (10) is set at the end of catenary b (12). The measurement terminals of current transformer a (6), current transformer b (8), voltage transformer a (9), and voltage transformer b (10) are all connected to the input interface of the measurement and control unit (14). The output interface of the measurement and control unit (14) is connected to the control terminals of the energy storage device (1), converter a (3), and converter b (4). The measurement and control unit (14) obtains the voltage at the end of the power supply arm and the feeder current in real time through current transformer a (6), current transformer b (8), voltage transformer a (9), and voltage transformer b (10), and controls the working states of the energy storage device (1), converter a (3), and converter b (4) in real time; It is characterized in that: Assume that the current traction at feeder a and feeder b is positive and the regeneration is negative; the power supply arm where catenary a is located is power supply arm a, and the power supply arm where catenary b is located is power supply arm b; then there are the following six states: (A), When the voltage at the end of power supply arm a is greater than the maximum allowable voltage of the power supply arm, and at the same time the voltage at the end of power supply arm b is greater than the maximum allowable voltage of the power supply arm, and the energy storage device (1) has space to store electrical energy, the measurement and control unit (14) controls converter a (3) and converter b (4) to rectify, and the energy storage device (1) stores electrical energy to reduce the voltage at the end of catenary a (11); if the energy storage device (1) is saturated with stored electrical energy, the measurement and control unit (14) controls converter a (3) and converter b (4) to absorb inductive reactive power to reduce the voltage at the end of catenary a (11); (B), When the voltage at the end of power supply arm a is less than the minimum allowable voltage of the power supply arm, and at the same time the voltage at the end of power supply arm b is less than the minimum allowable voltage of the power supply arm, and the energy storage device (1) has the condition to release electrical energy, the measurement and control unit (14) controls converter a (3) and converter b (4) to invert, and the energy storage device (1) releases electrical energy to increase the voltage at the end of catenary b (12); if the electrical energy of the energy storage device (1) has been released completely, the measurement and control unit (14) controls converter a (3) and converter b (4) to absorb capacitive reactive power to increase the voltage at the end of catenary b (12); (C) When the voltage at the end of power supply arm a is greater than the maximum allowable voltage of the power supply arm, while the voltage at the end of power supply arm b is less than the maximum allowable voltage of the power supply arm: If the current of feeder a + the current of feeder b ≥ 0, the measurement and control unit (14) controls the converter a (3) to rectify and the converter b (4) to invert, and all the regenerative braking energy is transferred from power supply arm a to power supply arm b; If the current of feeder a + the current of feeder b < 0, the measurement and control unit (14) controls the converter a (3) to rectify, and the energy storage device (1) stores electrical energy. If the energy storage device is already saturated, the measurement and control unit (14) controls the converter a (3) to absorb inductive reactive power. (D) When the voltage at the end of power supply arm b is greater than the maximum allowable voltage of the power supply arm, while the voltage at the end of power supply arm a is less than the maximum allowable voltage of the power supply arm: If the current of feeder a + the current of feeder b ≥ 0, the measurement and control unit (14) controls the converter b (4) to rectify and the converter a (3) to invert, and all the regenerative braking energy is transferred from power supply arm b to power supply arm a; If the current of feeder a + the current of feeder b < 0, the measurement and control unit (14) controls the converter b (4) to rectify, and the energy storage device (1) stores electrical energy. If the energy storage device is already saturated, the measurement and control unit (14) controls the converter b (4) to absorb inductive reactive power. (E) When the voltage at the end of power supply arm a is less than the minimum allowable voltage of the power supply arm and the voltage at the end of power supply arm b is normal, the measurement and control unit (14) controls the converter a (3) to invert, and the energy storage device (1) releases electrical energy to power supply arm a; If the electrical energy of the energy storage device (1) has been completely released, the measurement and control unit (14) controls the converter a (3) to invert and the converter b (4) to rectify, and power supply arm b shares part of the load of power supply arm a. (F) When the voltage at the end of power supply arm b is less than the minimum allowable voltage of the power supply arm and the voltage at the end of power supply arm a is normal, the measurement and control unit (14) controls the converter b (4) to invert, and the energy storage device (1) releases electrical energy to power supply arm b; If the electrical energy of the energy storage device (1) has been completely released, the measurement and control unit (14) controls the converter b (4) to invert and the converter a (3) to rectify, and power supply arm a shares part of the load of power supply arm b.

2. The control method of a train regenerative braking failure suppression device according to claim 1, characterized in that: When the voltages at the ends of both power supply arms are at normal levels: When the current of feeder a (5) + the current of feeder b (7) > the reference value, and the current of feeder a (5) is greater than the current of feeder b (7), the measurement and control unit (14) controls the converter a (3) to invert, and the energy storage device (1) releases electrical energy; When the current of feeder a (5) + the current of feeder b (7) > the reference value, and the current of feeder a (5) is less than the current of feeder b (7), the measurement and control unit (14) controls the converter b (4) to invert, and the energy storage device (1) releases electrical energy; When the current of feeder a (5) + the current of feeder b (7) < the reference value, the converter a (3), the converter b (4) and the energy storage device (1) are on standby.

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