Substation ac-dc integrated power system

Abstract

The utility model discloses a transformer substation AC-DC integrated power supply system, include: alternating current power subsystem, including with automatic switching switch alternating current switching device connection's 380V alternating current feeder, 220V DC power subsystem, include: parallel three port double output AC / DC converter for with 380V alternating current synchronous conversion 220V direct current and 48V direct current, 220V first direct current feeder, 220V second direct current feeder, first bidirectional DC / DC converter for isolating direct current battery bank voltage fluctuation and control charge and discharge, 48V communication power subsystem, include: 48V communication feeder, second bidirectional DC / DC converter for isolating communication battery bank voltage fluctuation and control charge and discharge, uninterruptible power supply subsystem, include: DC / AC inverter unit, AC / AC conversion unit, UPS feeder. The utility model is used to promote system power supply stability and equipment operation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of substation power supply technology, and in particular to an integrated AC / DC power supply system for substations. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the present invention described herein. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Current integrated power supply systems in substations use communication power supplies to convert 220V DC to 48V via independent DC / DC modules, and are equipped with 48V communication battery banks. This approach suffers from a wide operating voltage range for the battery banks, and voltage drops with age, leading to unstable DC power output. Furthermore, the large number of batteries results in high space costs. While existing solutions have attempted to optimize wiring structures or add parallel converters, they have not effectively solved the battery voltage fluctuation problem, nor have they achieved deep integration of the communication power supply and the DC power supply. Utility Model Content

[0004] This utility model provides an integrated AC / DC power supply system for substations, which achieves deep integration of AC / DC power supplies and voltage fluctuation suppression, thereby improving system power supply stability and equipment operating efficiency. The integrated AC / DC power supply system for substations includes:

[0005] An AC power supply subsystem includes a 380V AC feeder connected to an automatic transfer switch AC switching device; the automatic transfer switch AC switching device is used to switch between dual AC inputs.

[0006] The 220V DC power supply subsystem includes:

[0007] A parallel three-port dual-output AC / DC converter, whose input is connected to the 380V AC feeder, is used to synchronously convert 380V AC power into 220V DC power and 48V DC power.

[0008] A 220V first DC feeder is connected to the first output terminal of the three-port dual-output AC / DC converter.

[0009] A second 220V DC feeder is connected to the first 220V DC feeder.

[0010] First bidirectional DC / DC converter: The first port is connected to a DC battery pack with a rated voltage of less than 220V, used to isolate voltage fluctuations of the DC battery pack and control charging and discharging; the second port is connected to the 220V second DC feeder;

[0011] The 48V communication power supply subsystem includes:

[0012] A 48V communication feeder is connected to the second output terminal of the three-port dual-output AC / DC converter.

[0013] The second bidirectional DC / DC converter: the first port is connected to a communication battery pack with a rated voltage of less than 48V, used to isolate voltage fluctuations of the communication battery pack and control charging and discharging; the second port is connected to the 48V communication feeder.

[0014] The uninterruptible power supply subsystem includes:

[0015] The DC / AC inverter unit has its input terminal connected to the 220V second DC feeder;

[0016] The AC / AC conversion unit has its input terminal connected to the 380V AC feeder.

[0017] The UPS feeder connects to the output terminals of the DC / AC inverter unit and the AC / AC converter unit.

[0018] The substation AC / DC integrated power supply system provided in this embodiment includes the following: an AC power supply subsystem, including a 380V AC feeder connected to an automatic transfer switch AC switching device; the automatic transfer switch AC switching device is used to switch between dual AC inputs; a 220V DC power supply subsystem, including: a parallel three-port dual-output AC / DC converter, the input of which is connected to the 380V AC feeder, used to synchronously convert 380V AC power to 220V DC power and 48V DC power; a 220V first DC feeder connected to the first output of the three-port dual-output AC / DC converter; a 220V second DC feeder connected to the 220V first DC feeder; and a first bidirectional DC / DC converter: the first port is connected to a DC power supply with a rated voltage lower than 220V. A battery pack is used to isolate voltage fluctuations of the DC battery pack and control charging and discharging; the second port is connected to the 220V second DC feeder; a 48V communication power supply subsystem includes: a 48V communication feeder connected to the second output terminal of the three-port dual-output AC / DC converter; a second bidirectional DC / DC converter: the first port is connected to a communication battery pack with a rated voltage lower than 48V, used to isolate voltage fluctuations of the communication battery pack and control charging and discharging; the second port is connected to the 48V communication feeder; an uninterruptible power supply subsystem includes: a DC / AC inverter unit, whose input terminal is connected to the 220V second DC feeder; an AC / AC conversion unit, whose input terminal is connected to the 380V AC feeder; and a UPS feeder connected to the output terminals of the DC / AC inverter unit and the AC / AC conversion unit. This utility model embodiment uses a three-port dual-output AC / DC converter to simultaneously generate 220V and 48V DC power, replacing the two independent rectifier units in the prior art, thus solving the problems of high cost and complex maintenance caused by equipment redundancy. The bidirectional DC / DC converter allows charging of the battery from the feeder line during AC power supply and discharging of the battery to the feeder line during interruptions, eliminating feeder voltage fluctuations caused by the wide voltage range of the battery and aging. Furthermore, the use of DC battery packs with rated voltages below 220V and communication battery packs with rated voltages below 48V significantly reduces the number of batteries, lowering space occupation and cost. The automatic transfer switch AC switching device ensures... To ensure input reliability, the uninterruptible power supply (UPS) subsystem directly draws power from the 380V AC feeder and converts it to the AC power required by the UPS via an AC / AC conversion unit. Simultaneously, it draws power from the 220V second DC feeder and converts it to AC power via a DC / AC inverter unit. The outputs of both independent power supply paths are connected to the UPS feeder. When the AC power supply is normal, it is powered by the AC / AC conversion unit. When the AC power supply is interrupted, it automatically switches to the DC / AC inverter unit to provide power, achieving uninterrupted power output. This enables deep integration of AC and DC power supplies in the substation and suppression of voltage fluctuations, improving system power supply stability and equipment operating efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of an AC / DC integrated power supply system for a substation according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of this utility model and their descriptions are used to explain this utility model, but are not intended to limit this utility model.

[0022] In this document, the term "and / or" merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0023] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.

[0024] The acquisition, storage, use, and processing of data in this application comply with relevant regulations. The information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure, and application of related data all comply with relevant standards, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation interfaces are provided for users to choose to authorize or refuse.

[0025] It should be noted that in the embodiments of this application, certain existing solutions in the industry, such as software, components, and models, may be mentioned. For example, some existing software tools, components, algorithm models, or solutions well-known in other technical fields may be cited. These should be considered exemplary, and their purpose is only to illustrate the feasibility of implementing the technical solution of this application. These mentions should be understood as typical examples, and their core purpose is to illustrate and verify the rationality and feasibility of implementing the technical solution proposed in this application. However, this does not mean that the applicant has already used or necessarily used the solution. Such citations do not imply that the applicant has actually adopted these existing solutions, or that it will necessarily adopt these methods in its technical implementation process in the future. In other words, these mentions are only illustrative in nature, helping to understand the connection and transcendence of the innovation points of this application with the prior art, and do not constitute an endorsement or reliance statement on a specific prior art product.

[0026] Currently, for substations with high reliability requirements, the typical technical solution for their integrated power supply system is to convert 220V DC power to 48V communication power through a DC / DC module, while simultaneously configuring a 48V communication battery pack to supply power to the communication equipment in the event of a DC power failure, ensuring its normal operation. However, the battery pack has a large operating voltage range and suffers from voltage drop due to battery aging, resulting in unstable DC power output voltage of the integrated power supply, affecting the normal operation of the equipment, and also incurring high space costs. To address these issues, this embodiment proposes an AC / DC integrated power supply system structure that considers the communication power supply subsystem.

[0027] Existing integrated power supply wiring devices for substations generally have the following problems:

[0028] 1. There are issues with the wide voltage conversion range of the battery pack and battery aging;

[0029] 2. This only applies to photovoltaic substations and does not take into account communication power supply systems.

[0030] To address the aforementioned problems, this utility model provides an integrated AC / DC power supply system for substations, which achieves deep integration of AC / DC power supplies and voltage fluctuation suppression, thereby improving system power supply stability and equipment operating efficiency. (See also...) Figure 1 , Figure 1 This is a schematic diagram of the structure of an AC / DC integrated power supply system for a substation according to an embodiment of the present invention. The AC / DC integrated power supply system for the substation may include:

[0031] The AC power supply subsystem includes a 380V AC feeder 2 connected to an automatic transfer switch AC switching device 1; the automatic transfer switch AC switching device is used to switch between dual AC inputs.

[0032] The 220V DC power supply subsystem includes:

[0033] A parallel three-port dual-output AC / DC converter 3, whose input terminal is connected to the 380V AC feeder 2, is used to synchronously convert 380V AC power into 220V DC power and 48V DC power.

[0034] The 220V first DC feeder 4 is connected to the first output terminal of the three-port dual-output AC / DC converter 3;

[0035] The second 220V DC feeder 6 is connected to the first 220V DC feeder 4;

[0036] The first bidirectional DC / DC converter 8 has a first port connected to a DC battery pack 7 with a rated voltage lower than 220V, used to isolate voltage fluctuations of the DC battery pack and control charging and discharging; and a second port connected to the 220V second DC feeder 6.

[0037] The 48V communication power supply subsystem includes:

[0038] 48V communication feeder 12 is connected to the second output terminal of the three-port dual-output AC / DC converter 3;

[0039] The second bidirectional DC / DC converter 11 has a first port connected to a communication battery pack 10 with a rated voltage of less than 48V, used to isolate voltage fluctuations in the communication battery pack and control charging and discharging; and a second port connected to the 48V communication feeder 12.

[0040] The uninterruptible power supply subsystem includes:

[0041] DC / AC inverter unit 14, whose input terminal is connected to the 220V second DC feeder 6;

[0042] AC / AC conversion unit 15, whose input terminal is connected to the 380V AC feeder 2;

[0043] UPS feeder 16 connects to the output terminals of the DC / AC inverter unit 14 and the AC / AC conversion unit 15.

[0044] The substation AC / DC integrated power supply system provided in this embodiment includes the following: an AC power supply subsystem, including a 380V AC feeder connected to an automatic transfer switch AC switching device; the automatic transfer switch AC switching device is used to switch between dual AC inputs; a 220V DC power supply subsystem, including: a parallel three-port dual-output AC / DC converter, the input of which is connected to the 380V AC feeder, used to synchronously convert 380V AC power to 220V DC power and 48V DC power; a 220V first DC feeder connected to the first output of the three-port dual-output AC / DC converter; a 220V second DC feeder connected to the 220V first DC feeder; and a first bidirectional DC / DC converter: the first port is connected to a DC power supply with a rated voltage lower than 220V. A battery pack is used to isolate voltage fluctuations of the DC battery pack and control charging and discharging; the second port is connected to the 220V second DC feeder; a 48V communication power supply subsystem includes: a 48V communication feeder connected to the second output terminal of the three-port dual-output AC / DC converter; a second bidirectional DC / DC converter: the first port is connected to a communication battery pack with a rated voltage lower than 48V, used to isolate voltage fluctuations of the communication battery pack and control charging and discharging; the second port is connected to the 48V communication feeder; an uninterruptible power supply subsystem includes: a DC / AC inverter unit, whose input terminal is connected to the 220V second DC feeder; an AC / AC conversion unit, whose input terminal is connected to the 380V AC feeder; and a UPS feeder connected to the output terminals of the DC / AC inverter unit and the AC / AC conversion unit. This utility model embodiment uses a three-port dual-output AC / DC converter to simultaneously generate 220V and 48V DC power, replacing the two independent rectifier units in the prior art, thus solving the problems of high cost and complex maintenance caused by equipment redundancy. The bidirectional DC / DC converter allows charging of the battery from the feeder line during AC power supply and discharging of the battery to the feeder line during interruptions, eliminating feeder voltage fluctuations caused by the wide voltage range of the battery and aging. Furthermore, the use of DC battery packs with rated voltages below 220V and communication battery packs with rated voltages below 48V significantly reduces the number of batteries, lowering space occupation and cost. The automatic transfer switch AC switching device ensures... To ensure input reliability, the uninterruptible power supply (UPS) subsystem directly draws power from the 380V AC feeder and converts it to the AC power required by the UPS via an AC / AC conversion unit. Simultaneously, it draws power from the 220V second DC feeder and converts it to AC power via a DC / AC inverter unit. The outputs of both independent power supply paths are connected to the UPS feeder. When the AC power supply is normal, it is powered by the AC / AC conversion unit. When the AC power supply is interrupted, it automatically switches to the DC / AC inverter unit to provide power, achieving uninterrupted power output. This enables deep integration of AC and DC power supplies in the substation and suppression of voltage fluctuations, improving system power supply stability and equipment operating efficiency.

[0045] In specific implementation, the AC power supply subsystem includes a 380V AC feeder connected to an automatic transfer switch AC switching device; the automatic transfer switch AC switching device is used to switch between dual AC inputs.

[0046] In the above embodiment, the AC power subsystem includes an automatic transfer switch (ATS) and a 380V AC feeder connected thereto. The ATS receives two independent AC input sources and selects one of them to connect to the 380V AC feeder according to preset logic. The 380V AC feeder distributes power to the input terminals of the three-port dual-output AC / DC converter and the AC / AC conversion unit. When the primary AC input source fails, the ATS automatically disconnects the current path and switches to the backup AC input source, continuously maintaining power supply to the 380V AC feeder. The ATS uses a mechanical contact structure or a static electronic switching device to achieve physical switching.

[0047] In one embodiment, in the parallel three-port dual-output AC / DC converters, the first port, second port, and third port of adjacent three-port dual-output AC / DC converters are directly connected.

[0048] In the above embodiment, in the parallel three-port dual-output AC / DC converters, the first, second, and third ports of adjacent three-port dual-output AC / DC converters are directly connected. This connection method enables multiple converters to form a parallel structure, with the electrical nodes of each port interconnected, ensuring that the input ports and output ports of all converters are at the same potential.

[0049] like Figure 1 As shown, in specific implementation, the 220V DC power supply subsystem includes:

[0050] A parallel three-port dual-output AC / DC converter, whose input is connected to the 380V AC feeder, is used to synchronously convert 380V AC power into 220V DC power and 48V DC power.

[0051] A 220V first DC feeder is connected to the first output terminal of the three-port dual-output AC / DC converter.

[0052] A second 220V DC feeder is connected to the first 220V DC feeder.

[0053] The first bidirectional DC / DC converter 8: The first port is connected to a DC battery pack with a rated voltage of less than 220V, used to isolate the voltage fluctuation of the DC battery pack and control charging and discharging; the second port is connected to the 220V second DC feeder.

[0054] In this embodiment, the 220V DC power supply subsystem includes a parallel three-port dual-output AC / DC converter, whose input is connected to a 380V AC feeder. This converter simultaneously converts 380V AC power to 220V DC power and 48V DC power. The first 220V DC feeder is directly connected to the first output of the three-port dual-output AC / DC converter. The second 220V DC feeder is electrically connected to the first 220V DC feeder. The second port of the first bidirectional DC / DC converter is connected to the second 220V DC feeder, and the first port is connected to a DC battery pack with a rated voltage lower than 220V. When the AC power supply is normal, the second 220V DC feeder charges the DC battery pack through the first bidirectional DC / DC converter; when the AC power supply is interrupted, the DC battery pack discharges to the second 220V DC feeder through the first bidirectional DC / DC converter.

[0055] like Figure 1 As shown, in one embodiment, the 220V DC power supply subsystem further includes: a first rectifier switch A1, a second rectifier switch A2, and a third rectifier switch A3;

[0056] The input terminal of the parallel three-port dual-output AC / DC converter is connected to the 380V AC feeder via the first rectifier switch;

[0057] The 220V first DC feeder is connected to the first output terminal of the three-port dual-output AC / DC converter via a rectifier second switch;

[0058] The 48V communication feeder is connected to the second output terminal of the three-port dual-output AC / DC converter via a rectifier third disconnect switch.

[0059] In one embodiment, when the AC power supply is working normally, the first rectifier disconnect switch, the second rectifier disconnect switch, and the third rectifier disconnect switch are in the closed state.

[0060] like Figure 1 As shown, in one embodiment, the 220V DC power supply subsystem further includes: a first DC battery disconnect switch B1 and a second DC battery disconnect switch B2;

[0061] The second port of the first bidirectional DC / DC converter is connected to the 220V second DC feeder via the second switch of the DC battery; the first port of the first bidirectional DC / DC converter is connected to a DC battery pack with a rated voltage lower than 220V via the first switch of the DC battery.

[0062] In one embodiment, when the AC power supply is interrupted, the first rectifier disconnect switch, the second rectifier disconnect switch, and the third rectifier disconnect switch are in the open state, while the first DC battery disconnect switch, the second DC battery disconnect switch, the first communication battery disconnect switch, and the second communication battery disconnect switch are in the closed state.

[0063] In the above embodiment, the 220V DC power supply subsystem is equipped with a first rectifier disconnect switch, a second rectifier disconnect switch, and a third rectifier disconnect switch. The input terminal of the parallel unit of the three-port dual-output AC-DC converter is connected to the 380V AC feeder through the first rectifier disconnect switch. The first 220V DC feeder is connected to the first output terminal of the three-port dual-output AC-DC converter through the second rectifier disconnect switch. The 48V communication feeder is connected to the second output terminal of the three-port dual-output AC-DC converter through the third rectifier disconnect switch. When the AC power supply is normal, the first rectifier disconnect switch, the second rectifier disconnect switch, and the third rectifier disconnect switch remain closed and conducting.

[0064] The DC power supply subsystem also includes a first DC battery disconnect switch and a second DC battery disconnect switch. The second terminal of the first bidirectional DC-DC converter is connected to the second 220V DC feeder via the second DC battery disconnect switch, while the first terminal of the converter is connected to a DC battery bank with a rated voltage lower than 220V via the first DC battery disconnect switch. When the AC power supply is interrupted, the first, second, and third rectifier disconnect switches switch to the open state, while the first, second, first, and second DC battery disconnect switches, the first and second communication battery disconnect switches switch to the closed state.

[0065] Specifically, the first rectifier switch controls the electrical connection between the 380V AC feeder and the input terminal of the three-port dual-output AC-DC converter.

[0066] The second rectifier switch controls the electrical connection between the first output terminal of the three-port dual-output AC-DC converter and the 220V first DC feeder;

[0067] The third disconnect switch of the rectifier controls the electrical connection between the second output terminal of the three-port dual-output AC-DC converter and the 48V communication feeder.

[0068] The second switch of the DC battery controls the electrical connection between the second port of the first bidirectional DC converter and the 220V second DC feeder.

[0069] The first switch of the DC battery controls the electrical connection between the first port of the first bidirectional DC converter and the DC battery pack with a rated voltage of less than 220V.

[0070] When the AC power supply is normal, the first, second, and third disconnect switches of the rectifier maintain the electrical conduction path.

[0071] When the AC power supply is interrupted, the rectifier switch cuts off the electrical path, and the first and second switches of the DC battery and the corresponding switch on the communication side establish a discharge circuit from the battery pack to the feeder.

[0072] like Figure 1 As shown, in one embodiment, the 220V DC power supply subsystem further includes: a fuse 5;

[0073] The second 220V DC feeder is connected to the first 220V DC feeder via a fuse.

[0074] In this embodiment, the fuse provides a fixed electrical connection between the 220V first DC feeder and the 220V second DC feeder. The fuse also provides an uncontrollable physical conduction path between the feeders.

[0075] like Figure 1 As shown, in one embodiment, the 220V DC power supply subsystem further includes:

[0076] The first battery inspection device 9 is connected to the DC battery pack.

[0077] In the above embodiment, the first battery inspection device is directly connected to the positive and negative terminals of a DC battery pack with a rated voltage below 220V. It collects real-time voltage, current, and temperature data of individual battery cells, converts analog signals to digital signals via an isolation signal conversion circuit, and determines the battery's health status based on preset thresholds. The device periodically scans the parameters of each individual cell within the battery pack. When it detects an abnormal voltage drop, excessive temperature, or a sudden change in internal resistance, it generates a battery degradation warning signal and uploads it to the monitoring module.

[0078] like Figure 1 As shown, in one embodiment, the first bidirectional DC / DC converter 11 is specifically used for:

[0079] When powered by AC power, the DC battery pack with a rated voltage lower than 220V is charged by the 220V second DC feeder; and when the AC power is interrupted, the DC battery pack discharges to the 220V second DC feeder.

[0080] In the above embodiment, the first bidirectional DC-DC converter performs the following core functions: when the AC power supply is normal, it obtains power from the 220V second DC feeder and supplies current to the DC battery pack with a rated voltage lower than 220V to achieve charging; when the AC power supply is interrupted, it extracts power from the DC battery pack and outputs current to the 220V second DC feeder to achieve discharging.

[0081] like Figure 1 As shown, in a specific implementation, the 48V communication power supply subsystem includes:

[0082] 48V communication feeder 12 is connected to the second output terminal of the three-port dual-output AC / DC converter;

[0083] The second bidirectional DC / DC converter 11 has a first port connected to a communication battery pack with a rated voltage of less than 48V, used to isolate voltage fluctuations of the communication battery pack and control charging and discharging; and a second port connected to the 48V communication feeder.

[0084] like Figure 1 As shown, in one embodiment, the 48V communication power supply subsystem further includes: a first disconnect switch C1 for the communication battery and a second disconnect switch C2 for the communication battery;

[0085] The second port of the second bidirectional DC / DC converter is connected to the 48V communication feeder via the second disconnect switch of the communication battery; the first port of the second bidirectional DC / DC converter is connected to a communication battery pack with a rated voltage of less than 48V via the first disconnect switch of the communication battery.

[0086] In this embodiment, the 48V communication power supply subsystem achieves core connection control through the first and second disconnect switches of the communication battery. The second output port of the second bidirectional DC-DC converter is connected to the 48V communication feeder via the second disconnect switch of the communication battery, establishing a power transmission path; the first input and output ports of the converter are connected to the positive and negative terminals of a communication battery pack with a rated voltage lower than 48V via the first disconnect switch of the communication battery. The first disconnect switch of the communication battery controls the electrical on / off state of the battery pack's charging and discharging circuit, and the second disconnect switch of the communication battery controls the electrical on / off state of the converter and the communication feeder.

[0087] In one embodiment, the 48V communication power supply subsystem further includes:

[0088] The second battery inspection device is connected to the DC battery pack.

[0089] In the above embodiment, the second battery inspection device is directly connected to the positive and negative terminals of a communication battery pack with a rated voltage below 48V. It continuously monitors the individual battery cell voltage, circuit current, and casing temperature parameters. The collected analog signals are converted into digital signals through an analog-to-digital converter circuit, and the battery degradation status is determined based on preset thresholds. When the voltage is detected to be continuously lower than the float charge voltage, the temperature exceeds the safety limit, or the current fluctuates abnormally, a battery fault alarm signal is generated and transmitted to the monitoring module.

[0090] In one embodiment, the second bidirectional DC / DC converter is specifically used for:

[0091] When powered by AC power, the communication battery pack with a rated voltage lower than 48V is charged by the 48V communication feeder; and when the AC power is interrupted, the communication battery pack discharges to the 48V communication feeder.

[0092] In this embodiment, the second bidirectional DC-DC converter performs the following core functions: when the AC power supply is normal, it obtains power from the 48V communication feeder and supplies current to the communication battery pack with a rated voltage lower than 48V to charge it; when the AC power supply is interrupted, it extracts power from the communication battery pack and outputs current to the 48V communication feeder to discharge it. This converter eliminates the impact of battery pack voltage fluctuations on the communication feeder by controlling the charging and discharging direction.

[0093] In one embodiment, the first bidirectional DC / DC converter is mounted on a DC power supply panel, and the second bidirectional DC / DC converter is mounted on a communication power supply panel.

[0094] In the above embodiment, the first bidirectional DC-DC converter is installed entirely within the metal frame of the DC power supply panel, and its power terminals are electrically connected to the DC bus inside the panel via copper busbars.

[0095] The second bidirectional DC-DC converter is installed in a separate compartment of the communication power supply panel, and its control signal lines are connected to the communication interface unit on the top of the panel via shielded cables.

[0096] This split-screen installation method creates physically isolated independent functional areas for the DC power supply screen and the communication power supply screen. The DC power supply screen is equipped with a cooling fan to force-cool the first bidirectional DC converter, while the communication power supply screen is equipped with a dust filter to filter the intake air of the second bidirectional DC converter.

[0097] In practical implementation, the uninterruptible power supply subsystem includes:

[0098] The DC / AC inverter unit has its input terminal connected to the 220V second DC feeder;

[0099] The AC / AC conversion unit has its input terminal connected to the 380V AC feeder.

[0100] The UPS feeder connects to the output terminals of the DC / AC inverter unit and the AC / AC converter unit.

[0101] In this embodiment, the uninterruptible power supply (UPS) subsystem supplies power to the load through two independent paths. The AC-to-AC conversion unit directly obtains power from the 380V AC feeder, and outputs it to the UPS feeder after voltage adjustment; the DC-AC inverter unit obtains DC power from the second 220V DC feeder, inverts it into power frequency AC power, and outputs it to the same UPS feeder. The output terminals of the two paths are electrically connected in parallel on the copper busbars of the feeders. When the AC power supply is normal, the AC-to-AC conversion unit supplies power to the entire load; when the AC power supply is interrupted, the DC-AC inverter unit seamlessly takes over the power supply.

[0102] like Figure 1 As shown, in a specific implementation, a monitoring module 17 is also included for connecting to and monitoring:

[0103] Electrical parameters of the 380V AC feeder;

[0104] The operating status of the three-port dual-output AC / DC converter;

[0105] The current and battery inspection data of the DC battery pack;

[0106] The current and battery inspection data of the communication battery pack.

[0107] In this embodiment, the monitoring module performs the following monitoring operations:

[0108] 380V AC feeder monitoring: Real-time acquisition of voltage RMS value, current amplitude and frequency parameters;

[0109] Monitoring of three-port dual-output AC-DC converter: acquire input and output voltage and current values, module temperature and operation alarm signals;

[0110] DC battery pack monitoring: Collects the total current value of the battery pack and receives the individual cell voltage and temperature data uploaded by the battery inspection device;

[0111] Communication battery pack monitoring: Collects the total current value of the battery pack and receives the individual cell voltage and temperature data uploaded by the battery inspection device.

[0112] Two specific embodiments are given below to illustrate the specific application of this utility model.

[0113] First specific embodiment:

[0114] This embodiment provides an integrated AC / DC power supply system for a substation, including: an AC power supply subsystem, a 220V DC power supply subsystem, a 48V communication power supply subsystem, a UPS power supply subsystem, and a monitoring module. Wherein:

[0115] The AC power subsystem includes: an ATS AC switching device and a 380V AC feeder;

[0116] The 220V DC power supply subsystem includes: an AC / DC rectifier unit, a first rectifier disconnect switch, a second rectifier disconnect switch, a third rectifier disconnect switch, a first 220V DC feeder, a fuse, a second 220V DC feeder; a DC battery pack, a DC / DC converter unit, a first DC battery disconnect switch, a second DC battery disconnect switch, and a battery inspection unit;

[0117] The 48V communication power supply subsystem includes: a third disconnect switch for rectification, a 48V communication feeder, a communication battery pack, a DC / DC converter unit, a first disconnect switch for the communication battery, a second disconnect switch for the communication battery, and a battery inspection system.

[0118] The UPS power supply subsystem includes: a DC / AC inverter unit, an AC / AC conversion unit, and a UPS feeder.

[0119] In this embodiment, the AC / DC conversion unit includes multiple three-port dual-output AC / DC rectifiers, which are installed on the AC input panel. The multiple three-port dual-output AC / DC rectifiers are connected in parallel, that is, the first port, second port, and third port of adjacent three-port dual-output AC / DC rectifiers are connected together.

[0120] In this embodiment, the first port, second port, and third port of the AC / DC conversion unit are respectively connected to the first rectifier switch, the second rectifier switch, and the third rectifier switch. The first rectifier switch, the second rectifier switch, and the third rectifier switch are used to connect or disconnect the corresponding ports of the AC / DC conversion unit from the connected equipment.

[0121] In the embodiment, in the above-mentioned AC / DC integrated power supply system for substations, the DC / DC conversion unit consists of multiple bidirectional DC / DC converters connected in parallel, with the first and second ports of adjacent bidirectional DC / DC converters connected together.

[0122] In the embodiment, the DC / DC conversion unit included in the above-mentioned 220V DC power supply subsystem has its first port and second port connected to the first switch and the second switch of the DC battery, respectively, and is installed on the DC power supply panel.

[0123] In the embodiment, the DC / DC conversion unit included in the above-mentioned 48V communication power supply subsystem has its first port and second port connected to the first disconnect switch and the second disconnect switch of the communication battery, respectively, and is installed on the communication power supply panel.

[0124] In this embodiment, the aforementioned substation AC / DC integrated power supply system has an ATS AC switching device connected to a 380V AC feeder, which is then connected to the input port of the AC / DC rectifier unit. The first output port of the AC / DC rectifier unit is connected to a 220V first DC feeder, and the second output port is connected to a 48V communication DC feeder. The 220V first DC feeder is connected to a 220V second DC feeder via a fuse. The DC battery pack is connected to the 220V second DC feeder via a DC / DC converter unit. The communication battery pack is connected to the 48V communication DC feeder via a DC / DC converter unit. The outputs of the DC / AC inverter unit and the AC / AC converter unit are connected to the UPS feeder.

[0125] In the embodiments, the DC battery pack and the communication battery pack described above are explained in detail:

[0126] Among them, the rated voltage U of the DC battery pack N1 <220V;

[0127] Number of storage batteries n1=ceil{U N1 / U f1}, where: U f1 is the float charging voltage of the single storage battery;

[0128] The rated voltage U of the communication storage battery pack N2 <48V;

[0129] Number of storage batteries n2=ceil{U N2 / U f2}, where U f2 is the float charging voltage of the single storage battery.

[0130] It should be further noted that ceil is the ceiling function, that is, ceil(x)=a, where x<a<x+2, a∈Z, and (a / 2)∈Z.

[0131] Second specific embodiment:

[0132] The substation integrated power supply system, as shown in Figure 1 , comprises:

[0133] An AC power subsystem, a 220V DC power subsystem, a 48V communication power subsystem, a UPS power subsystem, and a monitoring module 17.

[0134] Wherein: the AC power subsystem comprises: an ATS AC switching device 1, and a 380V AC feeder 2;

[0135] The 220V DC power subsystem comprises:

[0136] An AC / DC rectifying unit 3, a first rectifying disconnect link A1, a second rectifying disconnect link A2, a 220V first DC feeder 4, a fuse 5, a 220V second DC feeder 6; a DC storage battery pack 7, a DC / DC conversion unit 8, a first DC battery disconnect link B1, a second DC battery disconnect link B2, and a battery inspection unit 9;

[0137] The 48V communication power subsystem comprises:

[0138] A third rectifying disconnect link A3, and a 48V communication feeder 12; a communication storage battery pack 10, a DC / DC conversion unit 11, a first communication battery disconnect link C1, a second communication battery disconnect link C2, and a battery inspection unit 13.

[0139] The UPS power subsystem comprises: a DC / AC inversion unit 14, an AC / AC conversion unit 15, and a UPS feeder 16.

[0140] The specific wiring is as follows:

[0141] The ATS AC switching device 1 is connected to the 380V AC feeder 2, and is connected to the input terminal of the AC / DC rectifier unit 3 via the first rectifier switch A1; the first output port of the AC / DC rectifier unit 3 is connected to the first DC feeder 4 via the second rectifier switch A2, and its second output port is connected to the 48V communication DC feeder 12 via the third rectifier switch A3; one end of the fuse 5 is connected to the 220V first DC feeder 4, and the other end is connected to the 220V second DC feeder 6;

[0142] One end of the DC / DC converter unit 8 is connected to the DC battery pack 7 via the first DC battery switch B1, and the other end is connected to the 220V second DC feeder 6 via the second DC battery switch B2.

[0143] One end of the DC / DC converter unit 11 is connected to the communication battery pack 10 via the first disconnect switch C1 of the communication battery, and the other end is connected to the 48V communication DC feeder 12 via the second disconnect switch C2 of the communication battery.

[0144] The input terminal of AC / AC converter 15 is connected to 380V AC feeder 2, the input terminal of DC / AC inverter 14 is connected to 220V second DC feeder 6, and the output terminals of AC / AC converter 15 and DC / AC inverter 14 are both connected to UPS feeder 16.

[0145] The monitoring scope of monitoring module 17 includes, but is not limited to, 380V AC feeder 2, AC / DC rectifier unit 3, DC battery pack 7 current and DC battery pack battery inspection module 9, communication battery pack 10 current and communication battery pack battery inspection module 13, etc.

[0146] To reduce the space requirements of the integrated power supply system, the AC / DC rectifier unit uses multiple three-port dual-output AC / DC converters connected in parallel and installed on the AC input panel; the DC battery pack and communication battery pack DC / DC converter units both use multiple bidirectional DC / DC converters connected in parallel and installed on the DC power supply panel and communication power supply panel respectively.

[0147] DC battery pack rated voltage U N 1<220V, Rated voltage U of communication battery pack N2 <48V.

[0148] For example, the rated voltage U of a DC battery pack N1 =110V, Rated voltage U of communication battery pack N2 =24V, using individual batteries with a rated voltage of 2V, the DC battery pack has 52 batteries, and the communication battery pack has 12 batteries. Compared with the 220V DC battery pack (containing 104 batteries) and the 48V communication battery pack (containing 24 batteries), the number of batteries is less, and the space and cost are lower.

[0149] The specific operating mode of the AC / DC rectifier unit is as follows:

[0150] During normal operation, the first rectifier switch A1, the second rectifier switch A2, and the third rectifier switch A3 are closed, and the 380V AC power is converted into 220V DC power and 48V DC power by the AC / DC rectifier unit. If the actual charge of the DC battery pack 7 is lower than its actual capacity, the first rectifier switch B1 and the second rectifier switch B2 are closed. The second port of the DC / DC converter unit 8 is the input terminal, and the first port is the output terminal. Power is supplied to the DC battery pack 7 through the second 220V DC feeder 6 until the battery is fully charged, at which point the first rectifier switch B1 and the second rectifier switch B2 are opened. If the actual charge of the communication battery pack 10 is lower than its actual capacity, the first rectifier switch C1 and the second rectifier switch C2 are closed. The second port of the DC / DC converter unit 11 is the input terminal, and the first port is the output terminal. Power is supplied to the communication battery pack 10 through the 48V communication DC feeder 12 until the battery is fully charged, at which point the first rectifier switch C1 and the second rectifier switch C2 are opened.

[0151] When the substation loses AC power or the AC / DC rectifier unit 3 malfunctions, the first rectifier disconnector A1, the second rectifier disconnector A2, and the third rectifier disconnector A3 open, the first DC battery disconnector B1 and the second DC battery disconnector B2 close, and the first communication battery disconnector C1 and the second communication battery disconnector C2 close. The first port of the DC / DC converter unit 8 is the input terminal, and the second port is the output terminal. The first port of the DC / DC converter unit 11 is the input terminal, and the second port is the output terminal. The DC battery pack 7 and the communication battery pack 10 supply power to the 220V second DC feeder 6 and the 48V communication DC feeder 12.

[0152] Table 1 is an example table showing the component names, connection methods, and specific functions of different components in the AC / DC integrated power supply system for substations provided in this embodiment.

[0153] Table 1

[0154]

[0155]

[0156]

[0157] The specific advantages of this utility model are as follows:

[0158] 1. The three-port dual-output AC / DC converter is adopted. Compared with the independent communication power supply system (i.e., two rectifier units output DC 220V and DC 48V respectively), the number of integrated power supply devices is reduced, the cost is reduced, and the system integration and maintenance convenience are improved while ensuring independence and reliability.

[0159] 2. Both the communication battery pack and the DC battery pack are equipped with bidirectional DC / DC converters, which effectively solves the problem of DC bus voltage fluctuation caused by the wide voltage conversion range of the battery pack and aging. This makes the voltage of the 220V DC feeder and the 48 communication feeder more stable and extends the service life of the batteries to a certain extent. At the same time, it reduces the voltage requirements of the battery packs, allowing the use of battery packs with lower voltage ratings, reducing the number of batteries and saving space and cost.

[0160] 3. Solved the problem of power outages in communication equipment caused by short circuits and overloads in the DC output branch of the DC power supply subsystem in the integrated power supply.

[0161] Of course, it is understood that there may be other variations of the above detailed process, and all such variations should fall within the protection scope of this utility model.

[0162] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A substation AC / DC integrated power supply system, characterized in that, include: The AC power supply subsystem includes a 380V AC feeder connected to an automatic transfer switch AC switching device; The automatic transfer switch AC switching device is used to switch between dual AC inputs; The 220V DC power supply subsystem includes: A parallel three-port dual-output AC / DC converter, whose input is connected to the 380V AC feeder, is used to synchronously convert 380V AC power into 220V DC power and 48V DC power. A 220V first DC feeder is connected to the first output terminal of the three-port dual-output AC / DC converter. A second 220V DC feeder is connected to the first 220V DC feeder. First bidirectional DC / DC converter: The first port is connected to a DC battery pack with a rated voltage of less than 220V, used to isolate voltage fluctuations of the DC battery pack and control charging and discharging; the second port is connected to the 220V second DC feeder; The 48V communication power supply subsystem includes: A 48V communication feeder is connected to the second output terminal of the three-port dual-output AC / DC converter. The second bidirectional DC / DC converter: the first port is connected to a communication battery pack with a rated voltage of less than 48V, used to isolate voltage fluctuations of the communication battery pack and control charging and discharging; the second port is connected to the 48V communication feeder. The uninterruptible power supply subsystem includes: The DC / AC inverter unit has its input terminal connected to the 220V second DC feeder; The AC / AC conversion unit has its input terminal connected to the 380V AC feeder. The UPS feeder connects to the output terminals of the DC / AC inverter unit and the AC / AC converter unit.

2. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The 220V DC power supply subsystem also includes: a first rectifier disconnect switch, a second rectifier disconnect switch, and a third rectifier disconnect switch; The input terminal of the parallel three-port dual-output AC / DC converter is connected to the 380V AC feeder via the first rectifier switch; The 220V first DC feeder is connected to the first output terminal of the three-port dual-output AC / DC converter via a rectifier second switch; The 48V communication feeder is connected to the second output terminal of the three-port dual-output AC / DC converter via a rectifier third disconnect switch.

3. The substation AC / DC integrated power supply system as described in claim 2, characterized in that, When the AC power supply is working normally, the first rectifier disconnect switch, the second rectifier disconnect switch, and the third rectifier disconnect switch are in the closed state.

4. The substation AC / DC integrated power supply system as described in claim 2, characterized in that, The 220V DC power supply subsystem also includes: a first disconnect switch for the DC battery and a second disconnect switch for the DC battery; The second port of the first bidirectional DC / DC converter is connected to the 220V second DC feeder via the second switch of the DC battery; the first port of the first bidirectional DC / DC converter is connected to a DC battery pack with a rated voltage lower than 220V via the first switch of the DC battery.

5. The substation AC / DC integrated power supply system as described in claim 4, characterized in that, When the AC power supply is interrupted, the first rectifier disconnect switch, the second rectifier disconnect switch, and the third rectifier disconnect switch are in the open state, while the first DC battery disconnect switch, the second DC battery disconnect switch, the first communication battery disconnect switch, and the second communication battery disconnect switch are in the closed state.

6. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The 220V DC power supply subsystem also includes: fuses; The second 220V DC feeder is connected to the first 220V DC feeder via a fuse.

7. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The 220V DC power supply subsystem also includes: The first battery inspection device is connected to the DC battery pack.

8. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The 48V communication power supply subsystem also includes: a first disconnect switch for the communication battery and a second disconnect switch for the communication battery; The second port of the second bidirectional DC / DC converter is connected to the 48V communication feeder via the second disconnect switch of the communication battery; the first port of the second bidirectional DC / DC converter is connected to a communication battery pack with a rated voltage of less than 48V via the first disconnect switch of the communication battery.

9. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The 48V communication power supply subsystem also includes: The second battery inspection device is connected to the DC battery pack.

10. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The first bidirectional DC / DC converter is specifically used for: When powered by AC power, the DC battery pack with a rated voltage lower than 220V is charged by the 220V second DC feeder; and when the AC power is interrupted, the DC battery pack discharges to the 220V second DC feeder.

11. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The second bidirectional DC / DC converter is specifically used for: When powered by AC power, the communication battery pack with a rated voltage lower than 48V is charged by the 48V communication feeder; and when the AC power is interrupted, the communication battery pack discharges to the 48V communication feeder.

12. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, In the parallel three-port dual-output AC / DC converters, the first, second, and third ports of adjacent three-port dual-output AC / DC converters are directly connected.

13. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, The first bidirectional DC / DC converter is installed on the DC power supply panel, and the second bidirectional DC / DC converter is installed on the communication power supply panel.

14. The substation AC / DC integrated power supply system as described in claim 1, characterized in that, It also includes a monitoring module for connecting and monitoring: Electrical parameters of the 380V AC feeder; The operating status of the three-port dual-output AC / DC converter; The current and battery inspection data of the DC battery pack; The current and battery inspection data of the communication battery pack.

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