Railway vehicle generator set and battery set uninterrupted power supply control method

Abstract

The application provides a kind of uninterrupted power supply control method for railway vehicle generator set and battery set, a holding circuit is added between the power supply of generator set and battery set, and uninterrupted power supply switching can be realized when the power supply of generator set and battery set is converted through the effective transition of holding circuit.The method of the application can avoid the power supply interruption of electric equipment during power supply switching process and avoid the arc generated during load switching process.

Description

Technical Field

[0001] This invention relates to a power supply control method for railway vehicle generator sets and battery packs. Background Technology

[0002] Currently, some special railway vehicles in China are equipped with diesel generator sets and batteries to power their electrical equipment in order to meet the requirements of operating on non-electrified lines. During vehicle operation, when switching between two power sources is necessary, a direct switch would cause arcing and electrical faults. Therefore, the current power supply must be disconnected before switching to the other. During this switching process, the railway vehicle will be without high-voltage power and will be in a temporary power-off state. During this time, inverters, chargers, air conditioners, electric heaters, air compressors, and other electrical equipment will stop working until the power switch is complete, at which point they can resume operation.

[0003] The aforementioned switching process constitutes a sudden load shedding for the power supply, causing output voltage fluctuations and reducing its lifespan. Similarly, the switching process also constitutes a sudden power shedding for the electrical equipment, increasing the number of start-stop cycles and thus reducing its lifespan. Furthermore, for passenger vehicles, the sudden stop of equipment such as air conditioning and electric heating during operation will reduce passenger comfort. Summary of the Invention

[0004] The purpose of this invention is to provide a method for uninterrupted power supply control of generator sets and battery banks in railway vehicles. This method enables the switching between two power supply modes, namely generator sets and battery banks, during vehicle operation, ensuring uninterrupted high-voltage power supply to the vehicle. At the same time, no electric arc is generated during the switching process, thereby ensuring the normal operation of electrical equipment during vehicle mode switching.

[0005] This invention provides a method for uninterrupted power supply control of a generator set and a battery pack for railway vehicles, wherein both the generator set and the battery pack can independently supply power to electrical equipment on the railway vehicle; the control method employs a mode selection switch, which includes a generator set position, a battery pack position, and a hold position;

[0006] The method includes the following steps:

[0007] First step: When the mode selection switch is initially in the generator set position, it issues a generator set mode command. The generator set position relay is energized and its contacts are closed. The generator set mode relay is energized and its contacts are closed. As a result, after receiving the generator set mode command, the rectifier controller controls the rectifier circuit connected to the generator set. As a result, the output voltage regulated by the rectifier circuit is output to the electrical equipment, thereby powering the electrical equipment.

[0008] Second step: The mode selection switch is switched to the holding position, the holding position relay is energized, its contacts are closed, the holding circuit is connected, and the generator set position relay is de-energized. However, since the holding circuit is connected, the generator set mode relay connected to the holding circuit is still energized. Therefore, the generator set can still supply power to the electrical equipment.

[0009] Third step: The mode selection switch is then switched to the battery pack position. At this time, both the holding position relay and the generator set mode relay are de-energized, and the conductive path of the battery pack will be opened, thereby supplying power to the electrical equipment.

[0010] According to the method of the present invention, preferably, in the first step, the rectifier connected to the generator set includes a first output voltage sensor and a first contactor, wherein the first output voltage sensor adjusts the output voltage to a first voltage value, and in this case, the first contactor is closed and supplies power to the electrical equipment at the first voltage value.

[0011] According to the method of the present invention, preferably, in the second step, the rectifier further adjusts the output voltage to a second voltage value and supplies power to the electrical device at the second voltage value.

[0012] According to the method of the present invention, preferably, the first voltage value is DC 500-600V and the second voltage value is DC 650-700V.

[0013] According to the method of the present invention, preferably, in the third step, after both the holding position relay and the generator set mode relay are de-energized, the battery pack position relay and the battery pack mode relay are energized. As a result, the power conversion device connected to the battery pack receives the battery pack mode command. In this case, the rectifier controller controls the output voltage of the rectifier to decrease, causing the first contactor to be de-energized. At the same time, the second contactor connected to the power conversion device closes, and the battery pack supplies power to the electrical equipment.

[0014] This invention also provides a method for uninterrupted power supply control of a generator set and a battery pack for railway vehicles. Both the generator set and the battery pack can independently supply power to electrical equipment on the railway vehicle. The control method employs a mode selection switch, which includes a generator set position, a battery pack position, and a hold position. The method includes the following steps:

[0015] First step: When the mode selection switch is initially in the battery pack position, it issues a battery pack mode command. The battery pack position relay is energized and its contacts close. The battery pack mode relay is energized and its contacts close. As a result, after receiving the battery pack mode command, the power conversion device controller controls the chopper circuit connected to the battery pack. As a result, the output voltage regulated by the chopper circuit is output to the electrical equipment, thereby powering the electrical equipment.

[0016] Second step: The mode selection switch is switched to the holding position, the holding position relay is energized, its contacts are closed, the holding circuit is connected, and the battery pack position relay is de-energized. However, since the holding circuit is connected, the battery pack mode relay connected to the holding circuit is still energized. Therefore, the battery pack can still supply power to the electrical equipment.

[0017] Third step: The mode selection switch is then switched to the generator set position. At this time, both the holding position relay and the battery pack mode relay are de-energized, and the conductive path of the generator set will be opened, thereby supplying power to the electrical equipment.

[0018] According to the method of the present invention, preferably, in the first step, the power conversion device connected to the battery pack includes a second contactor, and the power conversion device controller controls the chopper circuit to output voltage, thereby causing the second contactor to close and supply power to the electrical equipment.

[0019] According to the method of the present invention, preferably, in the second step, the power conversion device further adjusts the output voltage to a third voltage value and supplies power to the electrical equipment with the third voltage value, while the rectifier connected to the generator set adjusts its output voltage to a fourth voltage value.

[0020] According to the method of the present invention, preferably, the third voltage value is DC 650-700V, and the fourth voltage value is DC 500-600V.

[0021] According to the method of the present invention, preferably, in the third step, after both the holding position relay and the battery pack mode relay are de-energized, the generator set position relay and the generator set mode relay are energized, thereby the rectifier connected to the generator set receives the generator set mode command. In this case, the power conversion device controller controls the output voltage of the power conversion device to decrease, causing the second contactor to be de-energized. At the same time, the first contactor connected to the rectifier closes, and the generator set supplies power to the electrical equipment.

[0022] Therefore, the uninterrupted power supply control method for railway vehicle generator sets and batteries provided by this invention adds a holding circuit between the two power supply paths: generator set power supply and battery pack power supply. Through the effective transition of the holding circuit, uninterrupted power supply switching can be achieved when the railway vehicle switches between generator set and battery power supply. This avoids power interruption for electrical equipment during power switching and also prevents arcing during load switching, reducing the lifespan of electrical equipment. Simultaneously, it improves passenger comfort. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the main control circuit of the uninterruptible power supply control method for railway vehicle generator sets and batteries according to an embodiment of the present invention is shown.

[0025] Figure 2 A schematic diagram of the power supply control circuit of the uninterrupted power supply control method for railway vehicle generator sets and batteries according to an embodiment of the present invention is shown.

[0026] Figure 3 A schematic diagram of the controller input for an uninterrupted power supply control method for railway vehicle generator sets and batteries according to an embodiment of the present invention is shown.

[0027] The annotations in the attached figures are explained as follows:

[0028] 1-Diesel generator set, 2-Rectifier, 3-Electrical equipment, 4-Battery pack, 5-Power conversion device. Detailed Implementation

[0029] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Figure 1 A schematic diagram of the main control circuit of the uninterruptible power supply control method for railway vehicle generator sets and batteries according to an embodiment of the present invention is shown. Figure 1 As shown, the uninterruptible power supply control system for railway vehicle generator sets and batteries includes a generator set, a rectifier 2, electrical equipment 3, a battery pack 4, and a power conversion device 5. On railway vehicles, the generator set is typically a diesel generator set 1. Through the close coordination of this series of devices, a smooth switching between power supply from the engine set and power supply from the battery pack 4 is achieved, thereby ensuring that the input voltage of the electrical equipment 3 remains uninterrupted. Figure 1 In this circuit, the voltage Uab between terminals a and b of electrical equipment 3 will never be zero instantaneously, but will always remain within a specific range. In practical applications, Uab is typically within the range of DC 500V-DC 700V.

[0032] Figure 2 A schematic diagram of the power supply control circuit for an uninterrupted power supply control method for a railway vehicle generator set and battery, according to an embodiment of the present invention, is shown. Figure 2 As shown, the power supply control circuit includes a power-off switch SBDD, a mode selection switch SAMXZ, a generator set position relay KACY, a holding position relay KABC, a battery pack position relay KADC, a generator set mode relay KACYM, and a battery pack mode relay KADCM. This power supply control circuit, acting as the brain of the entire system, is primarily used for selecting the vehicle's power supply mode and transmitting commands to the rectifier controller and the power conversion unit controller.

[0033] Figure 3 A schematic diagram of the controller input for an uninterrupted power supply control method for railway vehicle generator sets and batteries, according to an embodiment of the present invention, is shown. Figure 3 As shown, the controller includes a rectifier controller and a power conversion device controller. Figure 3 The controller input circuit shown is mainly used to enable the controller to receive mode switching commands.

[0034] Electrical equipment 3 may include various electrical devices on railway vehicles, such as inverters, chargers, air conditioners, electric heaters, air compressors, etc.

[0035] like Figure 1 As shown, electrical equipment 3 receives power from two sources: diesel generator set 1 and battery pack 4. Therefore, there are four power supply modes for electrical equipment 3: diesel generator set 1 alone, battery pack 4 alone, diesel generator set 1 switching to battery pack 4, and battery pack 4 switching to diesel generator set 1. These four power supply modes will be described in detail below.

[0036] First, let's introduce the stand-alone power supply mode of the diesel generator set 1.

[0037] In this model, in the "brain" Figure 2 In the power supply control circuit shown, the mode selection switch SAMXZ is set to the "generator set position," thereby energizing the generator set position relay KACY and closing its contacts. In this case, as... Figure 3 The rectifier controller shown will receive generator set mode commands. Therefore, the rectifier controller can control... Figure 1 The rectifier 2 in the middle controls the rectifier circuit therein. Furthermore, the output voltage is adjusted according to the first output voltage sensor TV1. In particular, the output voltage is adjusted to DC600V. In this case, the first contactor KM1 will be closed, thereby supplying power to the electrical equipment 3.

[0038] In this mode, since the mode selection switch SAMXZ is set to "generator set position", only the generator set branch is ultimately triggered to supply power to the electrical equipment 3 through the rectification and regulation of the rectifier.

[0039] However, as Figure 2 As can be clearly seen, the mode selection switch SAMXZ is actually connected to three branches. One branch corresponds to the generator set independent power supply mode mentioned above, another branch corresponds to the battery pack 4 independent power supply mode mentioned below, and the third branch is to keep the mode selection switch SAMXZ in the hold position, which is extremely important for this invention, for smooth switching between generator set power supply and battery pack 4 power supply, which will also be described in detail below.

[0040] Next, we will introduce the independent power supply mode of battery pack 4.

[0041] In this model, in the "brain" Figure 2 In the power supply control circuit shown, the mode selection switch SAMXZ is set to the "battery pack position," thereby energizing the battery pack position relay KADC and closing its contacts. In this case, as... Figure 3 The power conversion unit controller shown will receive the battery pack mode command. Therefore, the power conversion unit controller can control... Figure 1 The power conversion device 5 controls the chopper circuit therein, and further adjusts the output voltage according to the second output voltage sensor TV2. In particular, the output voltage is adjusted to DC 600V. In this case, the second contactor KM2 will be closed to supply power to the electrical equipment 3.

[0042] The above describes the diesel generator set 1 and the battery pack 4 powered separately according to embodiments of the present invention. However, the key to the present invention lies in the smooth and seamless power supply switching between the diesel generator set 1 and the battery pack 4, which will be described in detail below.

[0043] Next, we will introduce the switching power supply mode from diesel generator set 1 to battery pack 4.

[0044] In this mode, the mode selection switch SAMXZ is initially set to the "generator set position". Figure 2 The generator set position relay KACY is energized, and at the same time, the generator set mode relay KACYM is also energized, and the corresponding contacts close. Figure 3 The rectifier controller in the generator set controls the rectifier circuit upon receiving the generator set mode command. Furthermore, it adjusts the output voltage to a first voltage value according to the first output voltage sensor TV1. In particular, it adjusts the output voltage to DC600V. In this case, the first contactor KM1 will be closed to supply power to the electrical equipment 3.

[0045] Next, the mode selection switch SAMXZ is switched to the holding position mentioned above. The holding position relay KABC is energized, its contacts close, and the holding circuit is connected. At the same time, the generator set position relay KACY is de-energized. However, since the holding circuit is connected, the generator set mode relay KACYM connected to the holding circuit is still energized. Therefore, the diesel generator set 1 can still supply power to the electrical equipment 3. At this time, the rectifier 2 adjusts the output voltage U1 (Uab=U1) to the second voltage value, for example, DC650V. At the same time, the power conversion device 5 adjusts its output voltage U2 to the third voltage value, for example, DC600V.

[0046] Next, switch the mode selection switch SAMXZ to the battery pack position. At this time, the holding position relay KABC and the generator set mode relay KACYM are de-energized, while the battery pack position relay KADC and the battery pack mode relay KADCM are energized, and their contacts close. In this situation, if... Figure 3 The power conversion device controller shown will receive the battery pack mode command. Subsequently, the second contactor KM2 will be closed.

[0047] At this time, the rectifier controller controls the output voltage of rectifier 2 to decrease by adjusting the conduction time of the power module until the output current TA1 detection value is less than a specific value, such as less than 50A, causing the first contactor KM1 to be de-energized.

[0048] With the second contactor KM2 closed and the first contactor KM1 de-energized, the battery pack 4 supplies power to the electrical equipment 3, and the mode switch is completed.

[0049] Next, we will introduce how the power supply mode of battery pack 4 can be switched to diesel generator set 1.

[0050] In this mode, the mode selection switch SAMXZ is initially set to the "battery pack position". Figure 2 When the battery pack position relay KADC is energized, the battery pack mode relay KADCM is also energized, and the corresponding contacts close. Figure 3 The power conversion device controller controls the chopper circuit output voltage, for example, DC600V, thereby causing the second contactor KM2 to close and supply power to the electrical equipment 3.

[0051] Next, the mode selection switch SAMXZ is switched to the holding position, the holding position relay KABC is energized, its contacts are closed, and the holding circuit is connected. At the same time, the battery pack position relay KADC is de-energized. However, since the holding circuit is connected, the battery pack mode relay KADCM, which is connected to the holding circuit, is still energized. Therefore, the battery pack 4 can still supply power to the electrical equipment 3. At this time, the power conversion device 5 adjusts the output voltage U2 (Uab=U2) to the third voltage value, for example, DC650V. At the same time, the rectifier device 2 adjusts its output voltage U1 to the fourth voltage value, for example, DC600V.

[0052] Next, switch the mode selection switch SAMXZ to the generator set position. At this time, the holding position relay KABC and the battery pack mode relay KADCM are de-energized, while the generator set position relay KACY and the generator set mode relay KACYM are energized, and their contacts close. In this situation, if... Figure 3 The power conversion unit controller shown will receive the generator set mode command. Subsequently, the first contactor KM1 will be closed.

[0053] At this time, the power conversion device controller controls the output voltage of the power conversion device 5 to decrease by adjusting the conduction time of the power module until the output current TA2 detection value is less than a specific value, such as less than 50A, causing the second contactor KM2 to be de-energized.

[0054] With the second contactor KM2 de-energized and the first contactor KM1 closed, the diesel generator set 1 supplies power to the electrical equipment 3, and the mode switch is completed.

[0055] As described above, during the switching process between the power supply from diesel generator set 1 and battery pack 4, the holding circuit plays a crucial transitional role. When switching from generator set power to battery pack 4, the generator set position relay is de-energized. Due to the holding circuit, the generator set can still supply power. Only after switching to the battery pack position does battery pack 4 actually supply power to the electrical equipment 3, thus achieving the power supply switch. Similarly, when switching from battery pack 4 power to generator set power, the battery pack 4 power supply relay is de-energized. Due to the holding circuit, battery pack 4 can still supply power. Only after switching to the generator set position does the generator set actually supply power to the electrical equipment 3, thus achieving the power supply switch.

[0056] Therefore, the uninterrupted power supply control method for railway vehicle generator sets and batteries provided by this invention can achieve uninterrupted power supply switching when railway vehicles switch between generator set and battery power supply. This avoids power interruption for electrical equipment during power switching and also prevents arcing during load switching, reducing the lifespan of electrical equipment. Simultaneously, this improves passenger comfort.

[0057] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for uninterrupted power supply control of a railway vehicle generator set and battery pack, characterized in that, Both the generator set and the battery pack can individually power the electrical equipment on the railway vehicle; the control method uses a mode selection switch, which includes a generator set position, a battery pack position, and a hold position. The method includes the following steps: First step: When the mode selection switch is initially in the generator set position, it issues a generator set mode command. The generator set position relay is energized and its contacts are closed. The generator set mode relay is energized and its contacts are closed. As a result, after receiving the generator set mode command, the rectifier controller controls the rectifier circuit connected to the generator set. As a result, the output voltage regulated by the rectifier circuit is output to the electrical equipment, thereby supplying power to the electrical equipment. Second step: The mode selection switch is switched to the holding position, the holding position relay is energized, its contacts are closed, the holding circuit is connected, and the generator set position relay is de-energized. However, since the holding circuit is connected, the generator set mode relay connected to the holding circuit is still energized. Therefore, the generator set can still supply power to the electrical equipment. Third step: The mode selection switch is then switched to the battery pack position. At this time, both the holding position relay and the generator set mode relay are de-energized, and the conductive path of the battery pack will be opened, thereby supplying power to the electrical equipment.

2. The method according to claim 1, characterized in that, In the first step, the rectifier connected to the generator set includes a first output voltage sensor and a first contactor. The first output voltage sensor adjusts the output voltage to a first voltage value. In this case, the first contactor is closed and supplies power to the electrical equipment with the first voltage value.

3. The method according to claim 2, characterized in that, In the second step, the rectifier further adjusts the output voltage to a second voltage value and supplies power to the electrical equipment at the second voltage value.

4. The method according to claim 3, characterized in that, The first voltage value is DC 500-600V, and the second voltage value is DC 650-700V.

5. The method according to claim 3, characterized in that, In the third step, after both the holding position relay and the generator set mode relay are de-energized, the battery pack position relay and the battery pack mode relay are energized. As a result, the power conversion device connected to the battery pack receives the battery pack mode command. In this case, the rectifier controller controls the output voltage of the rectifier to decrease, causing the first contactor to be de-energized. At the same time, the second contactor connected to the power conversion device closes, and the battery pack supplies power to the electrical equipment.

6. A method for uninterrupted power supply control of a railway vehicle generator set and battery pack, characterized in that, Both the generator set and the battery pack can individually power the electrical equipment on the railway vehicle; the control method uses a mode selection switch, which includes a generator set position, a battery pack position, and a hold position. The method includes the following steps: First step: When the mode selection switch is initially in the battery pack position, it issues a battery pack mode command. The battery pack position relay is energized and its contacts close. The battery pack mode relay is energized and its contacts close. As a result, after receiving the battery pack mode command, the power conversion device controller controls the chopper circuit connected to the battery pack. As a result, the output voltage regulated by the chopper circuit is output to the electrical equipment, thereby powering the electrical equipment. Second step: The mode selection switch is switched to the holding position, the holding position relay is energized, its contacts are closed, the holding circuit is connected, and the battery pack position relay is de-energized. However, since the holding circuit is connected, the battery pack mode relay connected to the holding circuit is still energized. Therefore, the battery pack can still supply power to the electrical equipment. Third step: The mode selection switch is then switched to the generator set position. At this time, both the holding position relay and the battery pack mode relay are de-energized, and the conductive path of the generator set will be opened, thereby supplying power to the electrical equipment.

7. The method according to claim 6, characterized in that, In the first step, the power conversion device connected to the battery pack includes a second contactor. The power conversion device controller controls the chopper circuit to output voltage, thereby causing the second contactor to close and supply power to the electrical equipment.

8. The method according to claim 7, characterized in that, In the second step, the power conversion device further adjusts the output voltage to a third voltage value and supplies power to the electrical equipment with the third voltage value. At the same time, the rectifier connected to the generator set adjusts its output voltage to a fourth voltage value.

9. The method according to claim 8, characterized in that, The third voltage value is DC 650-700V, and the fourth voltage value is DC 500-600V.

10. The method according to claim 8, characterized in that, In the third step, after both the holding position relay and the battery pack mode relay are de-energized, the generator set position relay and the generator set mode relay are energized. As a result, the rectifier connected to the generator set receives the generator set mode command. In this case, the power conversion device controller controls the output voltage of the power conversion device to decrease, causing the second contactor to be de-energized. At the same time, the first contactor connected to the rectifier device closes, and the generator set supplies power to the electrical equipment.

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