Power supply equipment aging system

Abstract

The utility model relates to the technical field of power supply aging, and discloses a power supply equipment aging system which comprises a direct current source, first power supply equipment, second power supply equipment and an isolation device, the direct current source is used for converting alternating current voltage input by an external energy supply system into direct current voltage, and the direct current side of the first power supply equipment and the direct current side of the second power supply equipment converge and are connected with the isolation device. The confluence endpoint is connected with the output end of the direct current source, the alternating current side of the first power supply equipment is connected with one side of the isolation device, the alternating current side of the second power supply equipment is connected with the other side of the isolation device, the power supply equipment aging system is low in investment of devices required by aging, and the aging cost of the power supply equipment can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply aging technology, and in particular to a power supply equipment aging system. Background Technology

[0002] To ensure reliable product quality, power supply equipment requires long-term aging during assembly and production. Some power supply equipment (such as energy storage converter PCS) has both charging and discharging modes, and its device operating modes and heat generation differ, thus typically requiring bidirectional aging during charging and discharging. Furthermore, due to its non-isolated nature, isolation devices are needed to prevent leakage current or insulation abnormalities. The long aging time presents challenges due to high energy consumption, and the investment in aging equipment also represents a significant expense when production capacity expands.

[0003] Existing aging schemes generally use a single power supply device for aging. The energy of the power supply device to be aged flows between the bidirectional DC source and the power grid. Each device (DC source, DC circuit breaker, power supply device, AC circuit breaker) bears full load losses, resulting in low aging efficiency. Related technologies have also proposed some schemes for aging dual power supply devices in different time periods. However, this scheme requires the use of dual transformers (or multi-tap transformers) during the aging process, and both the grid side and the DC side need to be equipped with power distribution protection devices. The number of components required for aging is large, and the cost is still high. Utility Model Content

[0004] In view of this, the present invention provides a power supply equipment aging system to solve or partially solve the technical problem that the existing dual power supply equipment aging requires a large number of components and has a high cost.

[0005] The technical solution proposed by this utility model is as follows:

[0006] This utility model provides a power supply equipment aging system, including a DC source, a first power supply device, a second power supply device, and an isolation device; the DC source is used to convert the AC voltage input from an external power supply system into a DC voltage; the DC side of the first power supply device and the DC side of the second power supply device are combined, and the combined terminal is connected to the output terminal of the DC source; the AC side of the first power supply device is connected to one side of the isolation device, and the AC side of the second power supply device is connected to the other side of the isolation device.

[0007] Optionally, the power supply aging system further includes a controller, which is connected to the first power supply and the second power supply respectively, and is used to control the aging power and aging time of the first power supply and the second power supply.

[0008] Optionally, the power supply aging system also includes a protection device, and the bus terminal is connected to the output terminal of the DC source through the protection device.

[0009] Optionally, the protection device is a DC circuit breaker.

[0010] Optionally, the external power supply system is a power grid.

[0011] Optionally, the isolation device is a transformer, with the AC side of the first power supply device connected to the primary side of the transformer, and the AC side of the second power supply device connected to the secondary side of the isolation device.

[0012] Optionally, the DC source is a unidirectional DC source.

[0013] Optionally, the first power supply device is a bidirectional non-isolated DC-AC power supply device.

[0014] Optionally, the second power supply device is a bidirectional non-isolated DC-AC power supply device.

[0015] The power supply equipment aging system of this utility model has the following beneficial effects:

[0016] This utility model discloses a power supply equipment aging system that converts AC voltage input from an external power supply system into DC voltage using a DC source. The DC sides of the first power supply equipment and the second power supply equipment are combined, and the combined terminal is connected to the output terminal of the DC source. The AC side of the first power supply equipment is connected to one side of the isolation device, and the AC side of the second power supply equipment is connected to the other side of the isolation device. It is not directly connected to the external power supply system. While one power supply equipment is charging and aging, the other power supply equipment is discharging and aging, which can realize the simultaneous aging of two power supply equipment. The DC source power does not need to be configured at full power, the aging energy consumption is low, and there is no need to isolate the DC source, only one isolation device is required, which reduces the investment in components required for aging and thus reduces the aging cost of power supply equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The circuit diagram of the power supply aging system during the discharge of the first power supply device in related technical solution 1;

[0019] Figure 2 A circuit diagram of the power supply aging system during charging of the first power supply device in related technical solution 1;

[0020] Figure 3 A circuit diagram of the power supply aging system during the discharge of the first power supply device and the charging of the second power supply device in related technical solution 2.

[0021] Figure 4 A circuit diagram of the power supply aging system during the charging of the first power supply device and the discharging of the second power supply device in related technical solution 2.

[0022] Figure 5 This is a circuit diagram of the power supply aging system during the discharge of the first power supply device and the charging of the second power supply device in an embodiment of the present invention.

[0023] Figure 6 This is a circuit diagram of the power supply aging system during the charging of the first power supply device and the discharging of the second power supply device in an embodiment of this utility model. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] Bidirectional non-isolated power supplies have charging and discharging modes. Their device operating modes and heat generation are different, so bidirectional aging is usually required. At the same time, due to their non-isolated characteristics, isolation devices (such as transformers) need to be set up to avoid leakage current or insulation abnormality. The relevant aging schemes are as follows.

[0029] Option 1: For aging of a single power supply unit, the DC side of the primary power supply unit (i.e., the DC / AC power supply) is provided with DC voltage via a bidirectional DC power supply; the AC side is isolated by a transformer to avoid leakage current issues. The primary side of the transformer is connected to the equipment, and the secondary side is connected to the power grid, providing a stable AC voltage through the grid. Figure 1 and Figure 2 As shown, the device operates in PQ mode, and bidirectional aging is performed by setting the discharge and charge times through the controller.

[0030] Option 2: Dual-powered equipment undergoes phased aging. The equipment uses a DC power supply, with the DC side obtaining DC voltage from the same bidirectional DC source. The AC power is connected to the primary side of an isolation transformer, and the secondary sides of the isolation transformer are combined and connected to the power grid to provide a stable AC voltage. Figure 3 and Figure 4 As shown, the equipment operates in PQ mode. The equipment is scheduled by a collaborative controller. One group is charged and aged first, while the other group is discharged and aged at a similar power. After the aging time is met, the power is switched by the collaborative controller.

[0031] In Scheme 1, the energy of the aging power supply equipment flows between the bidirectional DC source and the power grid. Each piece of equipment (DC source, DC circuit breaker, power supply equipment, AC circuit breaker) bears full-load losses, resulting in low aging efficiency. At the same time, the specifications of each piece of equipment must exceed the aging power requirements of the power supply equipment, and circuit breakers for both AC and DC power distribution protection devices must be added, leading to high costs. Finally, the power supply equipment to be aged is directly fed into the grid at high power, which greatly interferes with the power quality of the power grid, causing grid instability and even preventing the power supply equipment and surrounding equipment from aging properly.

[0032] In Scheme 2, the collaborative dispatch controller can maintain power balance as much as possible, with energy flowing between the two power supply devices. Only a small amount of unbalanced power remains between the DC source power and the grid, which can reduce the power of the grid and the bidirectional DC source. Compared with Scheme 1, the DC source can theoretically be configured with a smaller power, resulting in lower equipment investment. Moreover, the energy mainly flows between the two power supply devices and the isolation transformer, reducing DC source losses and improving energy efficiency. The power supplied by the grid is also smaller, reducing the impact on the grid. However, it is still connected to the grid, and interference to the grid still exists. During the aging process, dual transformers (or multi-tap transformers) are required, and both the grid and DC sides need to be equipped with protection devices, which still results in higher costs. Furthermore, if the collaborative controller is not properly dispatched, it will lead to power mismatch, causing abnormal aging or interruption of the power supply devices.

[0033] To address the aforementioned problems, this utility model provides a power supply equipment aging system, such as... Figure 5 and Figure 6 As shown, it includes: a DC source, a first power supply device, a second power supply device, and an isolation device; the DC source is used to convert the AC voltage input from the external power supply system into a DC voltage; the DC side of the first power supply device and the DC side of the second power supply device are combined, and the combined terminal is connected to the output terminal of the DC source; the AC side of the first power supply device is connected to one side of the isolation device, and the AC side of the second power supply device is connected to the other side of the isolation device.

[0034] Specifically, the external power supply system is a power supply system that provides AC power input, providing a reliable energy source for the first power supply equipment and the second power supply equipment.

[0035] In one example, the external power supply system is the power grid. The grid's stable and continuous power supply capability provides a reliable energy source for the power equipment aging system, which ensures the continuity and stability of the aging test and is not affected by external energy fluctuations.

[0036] When conducting aging tests, the DC source power does not need to be configured at full power, and there is no need for isolated DC sources or bidirectional DC sources.

[0037] In one example, the DC source is a unidirectional DC source, which simplifies system design and reduces costs. Furthermore, because a unidirectional DC source provides current in only one direction, it reduces system complexity and potential points of failure, improving the reliability and ease of maintenance of the power supply aging system.

[0038] Furthermore, both the first and second power supply devices are bidirectional non-isolated DCAC power supply devices. Bidirectional non-isolated DCAC sources (such as energy storage converters PCS) have charging and discharging modes, and their device operating modes and heat generation are different. Therefore, they usually require bidirectional aging during charging and discharging. At the same time, due to their non-isolated characteristics, isolation devices are required to prevent leakage current or insulation abnormalities.

[0039] The isolation device uses a transformer. The AC side of the first power supply device is connected to the primary side of the transformer, and the AC side of the second power supply device is connected to the secondary side of the transformer.

[0040] The working principle of the power supply equipment aging system of this utility model is as follows:

[0041] according to Figure 5After connecting all devices, power on both the first and second power supply devices. Configure the second power supply device to operate in VF mode to establish an AC power grid. Configure the first power supply device to operate in PQ mode and set the full discharge load and aging time. Once the aging time is met, the controller will change the power setting of the first power supply device, switching it to full charging load mode, thus achieving bidirectional aging of the two devices (first and second power supply devices) for charging and discharging.

[0042] This utility model discloses a power supply equipment aging system that converts the AC voltage input from an external power supply system into DC voltage using a DC source. The DC sides of a first power supply and a second power supply are combined, and the combined terminal is connected to the output terminal of the DC source. The AC side of the first power supply is connected to one side of an isolation device, and the AC side of the second power supply is connected to the other side of the isolation device. It is not directly connected to an external power supply system. While one power supply is charging and aging, the other power supply is discharging and aging, enabling simultaneous aging of two power supplies. The DC source does not need to be configured to full power, resulting in low aging energy consumption. Furthermore, it does not require an isolation DC source, only an isolation device is needed, reducing the investment in aging components and thus lowering the cost of power supply equipment aging.

[0043] In some embodiments, the power supply aging system further includes a controller, which is connected to the first power supply and the second power supply respectively, for controlling the aging power and aging time of the first power supply and the second power supply.

[0044] The controller, including terminals with control functions such as computers and mobile phones, allows for convenient management and control of both the primary and secondary power supply devices. This enables more precise management of the aging process, ensuring that the power supply devices age under safe conditions and avoiding problems such as overheating or overload. Precise control improves the efficiency and reliability of aging tests while reducing energy waste.

[0045] In some embodiments, the power supply aging system further includes a protection device, and the bus terminal is connected to the output of the DC source through the protection device.

[0046] Specifically, the protection device is a DC circuit breaker. The power of the DC circuit breaker does not need to meet the full-load operation of a single device; it only needs to provide the current loss of aging equipment.

[0047] The addition of protection devices provides extra safety between the bus terminal and the DC source output. During aging, in the event of an abnormality such as a short circuit or overcurrent, the protection devices can quickly disconnect the circuit to prevent damage to equipment and ensure personnel safety.

[0048] Simultaneous aging calculations for two power supply devices are performed under schemes 1, 2, and 3 (i.e., Figure 5The differences in equipment investment cost, aging energy consumption, and impact on the power grid of the proposed scheme are compared as follows.

[0049] Table 1. Analysis of Equipment Investment Costs

[0050]

[0051] Table 2 Comparison of Aging Energy Consumption

[0052]

[0053]

[0054] Table 3 Comparison of Impact on Power Grid

[0055] Detailed comparison Size of influence Option 1 Full-power grid feed, direct connection to the power grid big Option 2 Mismatched power feeds into the grid, directly connected to the grid. lower Option 3 The AC side is not connected to the power grid, so the equipment has no impact on the power grid and is not easily affected by the back influence of the power grid. Low

[0056] Analysis of the data in Tables 1 to 3 shows that the power supply equipment aging system of this utility model has at least the following beneficial effects:

[0057] 1. The AC voltage input from the external power supply system is converted to DC voltage through a DC source. The DC sides of the first power supply device and the second power supply device are combined, and the combined terminal is connected to the output terminal of the DC source. The AC side of the first power supply device is connected to one side of the isolation device, and the AC side of the second power supply device is connected to the other side of the isolation device. It is not directly connected to the external power supply system. While one power supply device is charging and aging, the other power supply device is discharging and aging, which can realize the aging of two power supply devices at the same time. Since the AC side of the power supply device to be aged is not directly connected to the power grid, and the AC side device has overcurrent protection function, no additional power distribution protection device circuit breaker is required at both ends of the transformer. During the aging test, a unidirectional source is used as the DC source, an isolation transformer is used as the isolation device and a circuit breaker are used, which simplifies the wiring. Compared with Scheme 1 and Scheme 2, the number of devices required is less and the investment in aging equipment is lower.

[0058] 2. It can achieve simultaneous aging of two power supply devices. The controller controls the aging power and time of the two power supply devices. After the aging time is met, the power is switched to achieve bidirectional aging. When the power supply devices are undergoing aging tests, energy feedback flows through the devices, resulting in less energy loss and lower aging energy consumption.

[0059] 3. The AC side of the power supply equipment under test does not need to be connected to the power grid, which can effectively reduce the direct interference to the power grid and reduce the impact of power grid anomalies on aging equipment.

[0060] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions and modifications to these embodiments without departing from the spirit and scope of protection of this utility model, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A power supply equipment aging system, characterized in that, It includes a DC source, a primary power supply device, a secondary power supply device, and an isolation device; The DC source is used to convert the AC voltage input from the external power supply system into DC voltage; The DC side of the first power supply device and the DC side of the second power supply device are combined, and the combined terminal is connected to the output terminal of the DC source; The AC side of the first power supply device is connected to one side of the isolation device, and the AC side of the second power supply device is connected to the other side of the isolation device.

2. The power supply equipment aging system according to claim 1, characterized in that, It also includes a controller, which is connected to the first power supply device and the second power supply device respectively, and is used to control the aging power and aging time of the first power supply device and the second power supply device.

3. The power supply equipment aging system according to claim 1, characterized in that, It also includes a protection device, and the bus terminal is connected to the output terminal of the DC source through the protection device.

4. The power supply equipment aging system according to claim 3, characterized in that, The protection device is a DC circuit breaker.

5. The power supply equipment aging system according to claim 1, characterized in that, The external power supply system is the power grid.

6. The power supply equipment aging system according to claim 1, characterized in that, The isolation device is a transformer. The AC side of the first power supply device is connected to the primary side of the transformer, and the AC side of the second power supply device is connected to the secondary side of the isolation device.

7. The power supply equipment aging system according to claim 1, characterized in that, The DC source is a unidirectional DC source.

8. The power supply equipment aging system according to claim 1, characterized in that, The first power supply device is a bidirectional non-isolated DC-AC power supply device.

9. The power supply equipment aging system according to claim 1, characterized in that, The second power supply device is a bidirectional non-isolated DC-AC power supply device.

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