Storage battery and gas turbine generator combined standby power supply system

Abstract

The invention belongs to the technical field of safety power supplies of nuclear power plants, and particularly relates to a storage battery and gas turbine generator combined standby power supply system which is applied to a nuclear power plant and comprises a storage battery branch, a gas turbine generator branch, a medium-voltage bus, a low-voltage working bus and a control system. Wherein the storage battery branch comprises a storage battery pack, an inverter and a first transformer which are electrically connected in sequence, and the output end of the storage battery branch is connected with the medium-voltage bus through a first incoming circuit breaker; the gas turbine generator branch adopts a gas turbine generator set, and the output end of the gas turbine generator set is connected with the medium-voltage bus through a second incoming circuit breaker; the output end of the gas turbine generator set is also connected with the low-voltage working bus through a third incoming circuit breaker and a second transformer; and the low-voltage working bus is connected with the gas turbine generator branch circuit at the high-voltage side or the low-voltage side of the second transformer through a fourth incoming circuit breaker, and is connected to a factory normal power supply network through a fifth incoming circuit breaker.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant safety power technology, specifically relating to a backup power system combining a storage battery and a gas turbine generator. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] To ensure the safe shutdown and continuous removal of residual heat in extreme conditions such as power outages, nuclear power plants are equipped with a defense-in-depth system. The backup power system is the core component of this defense system, directly supplying power to critical loads such as the residual heat removal system, important cooling water pumps, and instrumentation control systems. Its reliability is directly related to the safety status of the nuclear facility.

[0004] Currently, nuclear power plants generally use high-power backup diesel generator sets for their standby or emergency power systems. However, the manufacturing quality of high-power diesel engines and the number of qualified suppliers are limited. Instability in quality control during manufacturing leads to frequent quality problems after the equipment leaves the factory, such as start-up failures and sudden malfunctions during operation. The failure rate of diesel generators is relatively high, and if they cannot start or operate when needed, it poses a serious threat to the nuclear power plant's defense-in-depth capabilities. If backup diesel generator sets are unavailable for an extended period, the nuclear power plant must undergo shutdown and remediation, resulting in significant economic losses and social impact. Diesel generators require frequent maintenance and periodic testing to ensure their availability, a complex and costly process.

[0005] To overcome the drawbacks of diesel generators, gas turbine generator sets can be used as an alternative. Gas turbine generator sets offer advantages such as high operating efficiency, long maintenance cycles, and low emissions. However, when directly applying gas turbine generator sets with a power rating of 6 MW or higher to the backup power supply of nuclear power plants, the cold start time of the gas turbine generator typically requires 10 to 15 minutes, which cannot meet the nuclear safety regulations' requirements for the startup time of backup or emergency power supplies (i.e., they must be operational and provide power within 2 minutes). Furthermore, the inherent startup delay of gas turbines cannot meet this transient response requirement. Nuclear power plants have a strict requirement for backup power supplies: "100% load shedding without triggering overspeed protection shutdown." This means that when operating under load, if the load is suddenly completely cut off, the generator set should be able to maintain stable operation without triggering the overspeed protection device to shut down. Conventional gas turbine generator sets typically do not possess this ability to withstand instantaneous complete load shedding, posing a risk of shutdown due to overspeed. Summary of the Invention

[0006] To address the aforementioned issues, this invention proposes a backup power system combining a battery and a gas turbine generator. The battery branch and the gas turbine generator branch are connected in parallel to the medium-voltage busbar of the nuclear island. The battery branch can start rapidly after an external power outage, providing instantaneous and short-term power to critical loads. After successful startup, the gas turbine generator seamlessly connects to the busbar load. Through a unique design where the gas turbine generator reverses its charging mechanism to charge the battery during load shedding, the risk of gas turbine overspeed shutdown due to instantaneous load shedding is effectively avoided, significantly improving the reliability and safety of the backup power supply for nuclear power plants.

[0007] According to some embodiments, the present invention provides a backup power system combining a battery and a gas turbine generator, employing the following technical solution: A backup power system combining a battery and a gas turbine generator, applied in a nuclear power plant, is characterized by comprising a battery branch, a gas turbine generator branch, a medium-voltage bus, a low-voltage working bus, and a control system; wherein, the battery branch includes a battery pack, an inverter, and a first transformer connected in sequence, and the output end of the battery branch is connected to the medium-voltage bus via a first incoming circuit breaker; the gas turbine generator branch uses a gas turbine generator set, and the output end of the gas turbine generator set is connected to the medium-voltage bus via a second incoming circuit breaker; the output end of the gas turbine generator set is also connected to the low-voltage working bus via a third incoming circuit breaker and a second transformer; the low-voltage working bus is connected to the gas turbine generator branch via a fourth incoming circuit breaker on the high-voltage side or low-voltage side of the second transformer, and is connected to the plant's normal power supply network via a fifth incoming circuit breaker.

[0008] As a further technical limitation, the battery pack is also connected to the low-voltage working bus via a charging circuit.

[0009] Furthermore, the charging circuit includes a feeder circuit breaker, and the charging circuit is connected by controlling the feeder circuit breaker to close based on the control system.

[0010] Furthermore, the control system is configured as follows: When a power outage is detected at the nuclear power plant and the residual voltage switching fails, a start signal is generated to simultaneously start the battery branch and the gas turbine generator set. After the output voltage and frequency of the battery branch stabilize, the first incoming circuit breaker is closed, and power is supplied from the battery branch to the medium voltage bus. After the gas turbine generator set starts successfully and its output voltage and frequency meet the preset conditions, the second incoming circuit breaker is controlled to close after being judged by the synchronizing device. After the second incoming circuit breaker is closed, the third and fourth incoming circuit breakers are controlled to close after a delay, so that the power of the gas turbine generator set is supplied to the low-voltage working bus. When the second incoming circuit breaker opens from the closed state, the third and fourth incoming circuit breakers are controlled to remain closed, and the charging circuit is controlled to be connected so that the gas turbine generator set charges the battery pack.

[0011] Furthermore, before or at the moment of closing the second incoming circuit breaker, a preload signal is sent to the gas turbine generator set to preload the gas turbine generator set.

[0012] Furthermore, after the second incoming circuit breaker is closed, the gas turbine generator set is controlled to gradually increase its output power according to a preset program, and the output power of the battery branch is monitored. When the output power of the battery branch drops to a preset threshold, the first incoming circuit breaker is controlled to open, so that the battery branch is disconnected from power supply.

[0013] Furthermore, when the second incoming circuit breaker is in the open state, the third and fourth incoming circuit breakers are prohibited from closing; the fourth incoming circuit breaker and the fifth incoming circuit breaker are electrically interlocked, so that the fourth incoming circuit breaker and the fifth incoming circuit breaker cannot be in the closed state at the same time.

[0014] As a further technical limitation, the backup power system is a single-reactor single-sequence configuration of a nuclear power plant, or extended to a multi-reactor multi-sequence configuration, with each sequence equipped with the battery branch and the gas turbine generator branch.

[0015] As a further technical limitation, the rated capacity of the battery pack is configured to continuously discharge for at least 30 minutes at the rated power of the backup power system.

[0016] As a further technical limitation, the factors affecting the rated capacity of the battery pack include at least the battery aging coefficient, temperature coefficient, design margin coefficient, and design margin.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention combines "battery (fast response) + gas turbine (continuous power supply)" to form a complementary advantage. Based on the combination of multiple power sources and miniaturized mature models, it fundamentally improves the reliability and redundancy of the entire backup power system, meeting the high standards of nuclear safety.

[0018] This invention utilizes a battery bank to address the issue of insufficient start-up time for medium- and high-power gas turbines to meet nuclear safety requirements. The near-instantaneous start-up capability of the battery ensures extremely short power interruption time after grid failure, providing crucial initial power for safe shutdown and residual heat removal. By strictly limiting the battery capacity requirement to a short-term power supply of approximately 30 minutes, the size and cost of the battery are effectively controlled, avoiding the difficulties in deployment and huge investments caused by pursuing long-term power supply. This makes the technical solution both technologically advanced and economically feasible.

[0019] This invention absorbs the load shedding power of the gas turbine by charging the battery. When 100% load shedding occurs, the system can automatically and quickly redirect the gas turbine's output power to charge the battery, cleverly transforming it from a "power source" into a "controllable load" in an instant. This successfully solves a key obstacle in the application of gas turbine generators in nuclear power plants. The state logic in this invention covers all major operating conditions of the backup power system (normal, test, power failure emergency, load shedding). The logical relationships are clear and rigorous. The interlocking and timing control between circuit breakers ensure the automation and error-free operation process, reduce human intervention, and improve system response speed and overall operating efficiency. Attached Figure Description

[0020] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0021] Figure 1 This is an electrical architecture diagram of a backup power system combining a battery and a gas turbine generator, according to an embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.

[0026] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0027] Example Embodiment 1 of the present invention introduces a backup power system combining a storage battery and a gas turbine generator.

[0028] like Figure 1 The illustrated backup power system of a battery and gas turbine generator combination includes a medium-voltage bus, battery branches, gas turbine generator branches, a low-voltage working bus, an auxiliary power supply network, and a battery charging circuit; specifically: The medium-voltage busbar is usually a 10kV or 6kV busbar in the nuclear island. It is the final power supply target of the backup power system and is connected to the critical safety loads of the nuclear power plant.

[0029] The battery branch is the fast-response unit of the backup power system of the battery and gas turbine generator combination, including the battery bank, inverter, first transformer, and first incoming circuit breaker. The battery bank consists of multiple batteries connected in series and parallel to form, for example, a 250V DC power supply. Its rated capacity is a key design parameter, requiring it to continuously discharge at rated power for at least 30 minutes to cover the 15-minute start-up time of the gas turbine and allow sufficient margin. Capacity calculations must comprehensively consider the aging factor (recommended 1.25), temperature factor (recommended 1.11), design margin factor (recommended 1.1), and design margin (recommended 1.25). Furthermore, the battery bank must be able to provide the instantaneous inrush current of the maximum single-step load during sequential load operation and ensure that the bus voltage drop is not less than -20%. The inverter converts the DC power output from the battery bank into AC power at the industrial frequency. The first transformer boosts the voltage output from the inverter to the voltage level of the medium-voltage bus (e.g., 10kV). The first incoming circuit breaker is located at the connection point between the battery branch and the medium-voltage busbar, and is used to switch the branch on and off.

[0030] The gas turbine generator branch is a continuous power supply unit of the backup power system of the battery and gas turbine generator combination, including the gas turbine generator set and the second incoming circuit breaker; wherein, the rated power of the gas turbine generator set is selected according to the continuous rated power of the backup power supply; the second incoming circuit breaker is located at the connection point between the output of the gas turbine generator set and the medium voltage bus, and its closing must be detected by an automatic synchronizing device to ensure synchronization with the bus voltage.

[0031] The low-voltage working bus and auxiliary power supply network are typically 380V busbars, providing power to auxiliary equipment of the standby power system (such as cooling fans, lubricating oil pumps, control systems, etc.). This includes a second transformer, a third incoming circuit breaker, a fourth incoming circuit breaker, and a fifth incoming circuit breaker. The second transformer steps down the medium voltage (or converted voltage) output from the gas turbine generator to 380V. The third incoming circuit breaker is located between the gas turbine generator output and the second transformer. The fourth incoming circuit breaker connects the low-voltage side of the second transformer to the low-voltage working busbar. The fifth incoming circuit breaker connects the normal low-voltage power supply network within the plant (such as ECS-EK1X) to the low-voltage working busbar. The fourth and fifth incoming circuit breakers are electrically interlocked; under normal conditions, the fifth incoming circuit breaker is closed and the fourth incoming circuit breaker is open; in case of power failure, they switch over.

[0032] The battery charging circuit includes a feeder circuit breaker located between the low-voltage working bus and the battery bank. Under normal operating conditions, the battery charging circuit provides a floating charge to the battery; under specific operating conditions, it can serve as a load for the gas turbine.

[0033] For a single-reactor nuclear power plant, based on the power plant's electrical system configuration, for the single-sequence medium-voltage bus ECS-ES-1, this embodiment sets two backup power supply lines, corresponding to the battery bank and the backup gas turbine generator set, respectively.

[0034] The rated capacity of each battery pack in the sequence is considered based on the continuous rated power of the standby power supply. Since the start-up time of the gas turbine is generally 15 minutes, the discharge duration of the battery pack under rated power can be conservatively considered at 30 minutes. When selecting the battery pack capacity, it is also necessary to consider the battery aging factor (recommended value 1.25), temperature factor (recommended value 1.11), design margin factor (recommended value 1.1), and design margin (recommended value 1.25). It is also necessary to consider that the instantaneous discharge current of the battery can encompass the maximum value of the instantaneous current of a single-step load when the standby power supply is sequentially loaded, and the transient voltage drop of the busbar during loading should be ≥-20%. The rated power of the standby gas turbine generator can be considered based on the continuous rated power of the standby power supply.

[0035] like Figure 1As shown, the UAT incoming line is powered by external power. When external power is lost, residual voltage switching occurs, and external power is supplied by the RAT incoming line. If residual voltage switching fails, a low voltage signal is generated to automatically start the battery bank and gas turbine generator set. The battery bank has a very short start-up time, using multiple batteries connected in parallel and series to form a 250V DC power supply, which is then converted to 10kV AC power through an inverter and transformer. When the transformer outlet voltage is detected to reach the rated voltage and frequency, the first incoming circuit breaker closes, and the battery bank supplies power to the loads at each level on the medium-voltage bus according to a predetermined load-carrying procedure. After the standby gas turbine generator starts successfully, the automatic synchronizing device of the standby gas turbine generator performs synchronization and the second circuit breaker closes. The battery bank and gas turbine generator set are located in a certain factory building, with a 380V low-voltage working busbar installed as the power source for the factory building. Under normal circumstances, all auxiliary system equipment and public equipment in the backup power plant are powered by the low-voltage section ECS-EK1X downstream of ECS-ES-1. In the event of a power failure, after the backup gas turbine generator starts successfully, all auxiliary system equipment and public equipment in the backup power plant are powered by the backup gas turbine generator output circuit breaker through a transformer.

[0036] The control logic of the backup power system of the battery and gas turbine generator combination in this embodiment includes the entire process from normal state to power failure emergency state and then to recovery state. (1) Normal operating conditions: External power supplies are supplied to the medium-voltage busbar via the UAT incoming line, etc.; the low-voltage working busbar is supplied by the normal power supply network of the plant through the fifth incoming circuit breaker; the battery pack is in float charging state through the feeder circuit breaker.

[0037] It should be noted that when the gas turbine generator set is in standby mode, all incoming circuit breakers (i.e., the first incoming circuit breaker, the second incoming circuit breaker, the third incoming circuit breaker, and the fourth incoming circuit breaker) are in the open state.

[0038] (2) Power failure start-up and switching When external power is lost and the backup external power supply (RAT incoming line) fails to switch residual voltage, the control system generates a low voltage signal and simultaneously starts the battery branch (inverter starts working) and the gas turbine generator set. The battery branch quickly establishes voltage and frequency through inversion and transformation. Once the voltage and frequency at the first transformer outlet side are detected to be stable at their rated values, the control system closes the first incoming line circuit breaker. The battery branch then begins supplying power to the critical loads at each level on the medium-voltage busbar according to a preset load-carrying sequence.

[0039] After the gas turbine generator set starts successfully, its speed and voltage stabilize. The control system monitors the phase, frequency, and amplitude of the gas turbine generator output voltage and the medium-voltage bus voltage using an automatic synchronizing device. When the synchronization conditions are met, the system prepares to close the second incoming circuit breaker. Simultaneously or instantaneously with closing the second incoming circuit breaker, the control system sends a preload signal to the gas turbine generator control cabinet, causing the gas turbine to preload a small load (e.g., a partial auxiliary load) to avoid reverse power at the moment of closing. After closing the second incoming circuit breaker, the gas turbine generator set operates in parallel with the battery branch. Subsequently, the control system gradually increases the output power of the gas turbine generator set according to a set program. Based on the principle of power balance, the output power of the battery branch will gradually decrease accordingly. When the output power of the battery branch drops to a low safety threshold (e.g., approximately 800kW, to avoid excessive impact on the power grid from a sudden power outage), the control system disconnects the first incoming circuit breaker, the battery branch disconnects from power supply, and the gas turbine generator set independently bears the entire load.

[0040] After the second incoming circuit breaker closes, the control system delays (e.g., 15 seconds) before closing the third and fourth incoming circuit breakers. Simultaneously, the fifth incoming circuit breaker is disconnected. At this point, all auxiliary equipment in the backup power plant is powered by the gas turbine generator set itself via a transformer, forming a self-sufficient independent system.

[0041] (3) Overspeed prevention control logic (load shedding condition) When a gas turbine generator set is operating under load, and for some reason it is necessary to instantly disconnect all loads (i.e., the second incoming circuit breaker is tripped), in order to prevent the gas turbine from overspeeding due to a lack of power output, the control system performs the following operations: 1) While the second incoming circuit breaker is open, the control system keeps the third and fourth incoming circuit breakers closed for at least a period of time (e.g., 2 minutes, the specific duration of which can be recommended by the gas turbine manufacturer based on the characteristics of the unit such as inertia).

[0042] 2) Send a closing signal to the feeder circuit breaker to close it.

[0043] 3) The output power of the gas turbine generator cannot be sent to the medium-voltage bus, but it can be sent to the low-voltage working bus through the second transformer, and then charged in reverse through the closed feeder circuit breaker. This charging load instantly replaces the lost main load, effectively consuming the output power of the gas turbine, thereby suppressing the sharp increase in speed and avoiding overspeed protection shutdown.

[0044] This embodiment combines "battery (fast response) + gas turbine (continuous power supply)" to form a complementary advantage. Based on the combination of multiple power sources and miniaturized mature models, it fundamentally improves the reliability and redundancy of the entire backup power system, meeting the high standards of nuclear safety.

[0045] This embodiment utilizes a battery bank to address the issue of insufficient start-up time for medium-to-high-power gas turbines to meet nuclear safety requirements. The near-instantaneous start-up capability of the battery ensures extremely short power interruption time after grid failure, providing crucial initial power for safe shutdown and residual heat removal. By strictly limiting the battery capacity requirement to a short-term power supply of approximately 30 minutes, the size and cost of the battery are effectively controlled, avoiding the difficulties in deployment and huge investments caused by pursuing long-term power supply. This makes the technical solution both technologically advanced and economically feasible.

[0046] This embodiment absorbs the load shedding power of the gas turbine by charging the battery. When 100% load shedding occurs, the system can automatically and quickly guide the output power of the gas turbine to charge the battery, cleverly transforming it from a "power source" into a "controllable load" in an instant, successfully solving a key obstacle in the application of gas turbine generators in nuclear power plants. The state logic in this invention covers all major operating conditions of the backup power system (normal, test, power failure emergency, load shedding), with clear and rigorous logical relationships. The interlocking and timing control between circuit breakers ensure the automation and error-free operation process, reduce human intervention, and improve system response speed and overall operating efficiency.

[0047] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0048] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A backup power system combining a storage battery and a gas turbine generator, applied in a nuclear power plant, characterized in that, The system includes a battery branch, a gas turbine generator branch, a medium-voltage busbar, a low-voltage working busbar, and a control system. The battery branch comprises a battery bank, an inverter, and a first transformer connected in sequence. The output of the battery branch is connected to the medium-voltage busbar via a first incoming circuit breaker. The gas turbine generator branch uses a gas turbine generator set. The output of the gas turbine generator set is connected to the medium-voltage busbar via a second incoming circuit breaker. The output of the gas turbine generator set is also connected to the low-voltage working busbar via a third incoming circuit breaker and a second transformer. The low-voltage working busbar is connected to the gas turbine generator branch via a fourth incoming circuit breaker on either the high-voltage or low-voltage side of the second transformer, and is connected to the plant's normal power supply network via a fifth incoming circuit breaker.

2. The backup power system of the battery and gas turbine generator combination as described in claim 1, characterized in that, The battery pack is also connected to the low-voltage working bus via a charging circuit.

3. A backup power system combining a storage battery and a gas turbine generator as described in claim 2, characterized in that, The charging circuit includes a feeder circuit breaker, and the charging circuit is connected by controlling the feeder circuit breaker to close based on the control system.

4. A backup power system combining a storage battery and a gas turbine generator as described in claim 2, characterized in that, The control system is configured as follows: When a power outage is detected at the nuclear power plant and the residual voltage switching fails, a start signal is generated to simultaneously start the battery branch and the gas turbine generator set. After the output voltage and frequency of the battery branch stabilize, the first incoming circuit breaker is closed, and power is supplied from the battery branch to the medium voltage bus. After the gas turbine generator set starts successfully and its output voltage and frequency meet the preset conditions, the second incoming circuit breaker is controlled to close after being judged by the synchronizing device. After the second incoming circuit breaker is closed, the third and fourth incoming circuit breakers are controlled to close after a delay, so that the power of the gas turbine generator set is supplied to the low-voltage working bus. When the second incoming circuit breaker opens from the closed state, the third and fourth incoming circuit breakers are controlled to remain closed, and the charging circuit is controlled to be connected so that the gas turbine generator set charges the battery pack.

5. A backup power system combining a battery and a gas turbine generator as described in claim 4, characterized in that, Before or at the moment the second incoming circuit breaker closes, a preload signal is sent to the gas turbine generator set to preload the gas turbine generator set.

6. A backup power system combining a battery and a gas turbine generator as described in claim 5, characterized in that, After the second incoming circuit breaker is closed, the gas turbine generator set is controlled to gradually increase its output power according to a preset program. The output power of the battery branch is monitored. When the output power of the battery branch drops to a preset threshold, the first incoming circuit breaker is controlled to open, so that the battery branch is disconnected from power supply.

7. A backup power system combining a battery and a gas turbine generator as described in claim 4, characterized in that, When the second incoming circuit breaker is in the open state, the third and fourth incoming circuit breakers are prohibited from closing; the fourth incoming circuit breaker and the fifth incoming circuit breaker are electrically interlocked, so that the fourth incoming circuit breaker and the fifth incoming circuit breaker cannot be in the closed state at the same time.

8. A backup power system combining a battery and a gas turbine generator as described in claim 1, characterized in that, The backup power system is configured as a single reactor and single sequence in a nuclear power plant, or extended to a multi-reactor and multi-sequence configuration, with each sequence equipped with the battery branch and the gas turbine generator branch.

9. A backup power system combining a battery and a gas turbine generator as described in claim 1, characterized in that, The rated capacity of the battery pack is configured to continuously discharge for at least 30 minutes at the rated power of the backup power system.

10. A backup power system combining a battery and a gas turbine generator as described in claim 1, characterized in that, The factors affecting the rated capacity of the battery pack include at least the battery aging coefficient, temperature coefficient, design margin coefficient, and design margin.

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