Energy storage control method and system for thermal power plant serving as standby power supply of data center

Abstract

The invention discloses an energy storage control method and system for a thermal power plant serving as a data center standby power supply, and relates to the technical field of energy storage control. According to the invention, the working information of the rated equipment of the thermal power plant is obtained, and the maximum charging and discharging power of the energy storage control device is calculated, so that the thermal power plant can be controlled to charge the energy storage control device according to the maximum charging and discharging power of the energy storage control device when the main power grid breaks down; and the energy storage control device and the thermal power plant are controlled to supply power to the data center, so that the thermal power plant is prevented from losing stability due to a large amount of load shedding, the comprehensive gradeability of the thermal power plant serving as a standby power supply of the data center is improved, and the minimum load of the thermal power plant is maintained under the extreme condition that a main power grid collapses. Therefore, the steady-state operation of the thermal power plant when the power grid fails is ensured, and the stable operation of the data center is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage control, and in particular relates to an energy storage control method and system for a thermal power plant serving as a backup power source for a data center. Background Art

[0002] Data centers consume huge amounts of energy, and data centers of different levels have different load consumption levels. In order to ensure the stable operation of data centers, large data centers require dual power supplies and should be equipped with backup power supplies. Diesel generators have been widely used in data center backup power supplies due to their compact structure, flexible installation locations, high thermal efficiency of generators, and rapid start-up, becoming the main form of backup power supply for data centers. However, diesel generators have disadvantages such as small unit capacity, poor long-term load capacity of units, high fire risks, and high one-time investment. With the expansion of the scale of data centers and the increase in power density, the disadvantages of using diesel generators as backup power supplies have gradually become apparent.

[0003] At present, a method of using a thermal power plant as a backup power source has been proposed, thereby replacing diesel generators as a backup power source. However, the solution of using a nearby thermal power plant as a backup power source for a data center also has some technical defects. For example, when the power grid collapses, it is difficult for the thermal power units of the thermal power plant to operate in a steady state, resulting in poor results as a backup power source. In addition, when the thermal power plant is used as a backup power source in the event of a power grid collapse, it requires a certain amount of restart time, but the current restart time is too long, making it difficult to meet the requirements as a backup power source, further reducing the effect as a backup power source. These have led to the current situation where the thermal power plant is used as a backup power source for the data center, resulting in poor results and the data center is difficult to operate stably. Therefore, there is an urgent need for a storage control method and system for using a thermal power plant as a backup power source for a data center to solve the defects of the prior art. Summary of the invention

[0004] The present invention aims to provide an energy storage control method and system for a thermal power plant as a backup power supply for a data center to solve the above-mentioned technical problems. An energy storage control device is connected in parallel between the thermal power plant and the data center, and the charging and discharging of the energy storage control device are used to realize the steady-state operation of the thermal power plant during a power grid failure, thereby improving the operating effect of the thermal power plant as a backup power supply for the data center and ensuring the stable operation of the data center.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an energy storage control method for a thermal power plant as a backup power supply for a data center, which is applicable to an energy storage control system, wherein the energy storage control system comprises: a data center, a thermal power plant, a main power grid and an energy storage device, wherein the energy storage device comprises: a measurement and control unit;

[0006] The output end of the thermal power plant is electrically connected to the input end of the main power grid; the output end of the thermal power plant is electrically connected to the third input end of the data center; the first output end of the main power grid is electrically connected to the first input end of the data center; the second output end of the main power grid is electrically connected to the second input end of the data center; the output end and the input end of the energy storage device are electrically connected to the output end of the thermal power plant respectively;

[0007] The energy storage control method of a thermal power plant as a backup power supply for a data center specifically comprises the following steps:

[0008] Based on the measurement and control unit, the rated equipment operating information of the thermal power plant is obtained, and after the maximum charge and discharge power of the energy storage device is calculated, an energy storage charging control signal and an energy storage discharging control signal are output;

[0009] The output energy storage charging control signal is used to control the thermal power plant to charge the energy storage device based on the maximum charging and discharging power when the main power grid fails, until the data center meets the preset power supply conditions;

[0010] The energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions.

[0011] It can be understood that, compared with the prior art, the present invention obtains the rated equipment working information of the thermal power plant and calculates the maximum charge and discharge power of the energy storage control device, so that when a main power grid fails, the thermal power plant can be controlled to charge the energy storage control device according to the maximum charge and discharge power of the energy storage control device, and the energy storage control device and the thermal power plant can be controlled to supply power to the data center, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, and achieving the minimum load of the thermal power plant under extreme conditions of main power grid collapse, thereby ensuring the steady-state operation of the thermal power plant during power grid failure and ensuring the stable operation of the data center.

[0012] As a preferred solution, the method of obtaining the rated equipment operating information of the thermal power plant based on the measurement and control unit and calculating the maximum charge and discharge power of the energy storage device specifically includes:

[0013] Based on the measurement and control unit, the rated equipment operation information of the thermal power plant is obtained, and the equipment operation information includes: the rated output power of the thermal power plant;

[0014] Determining the minimum load rate and plant power load of the thermal power plant according to the rated output power of the thermal power plant;

[0015] The maximum charge and discharge power of the energy storage device is determined according to the minimum load rate and the plant power load; wherein the maximum charge and discharge power expression of the energy storage device is:

[0016] P cm ≥0.3P+0.07P,

[0017] Among them, P cm is the maximum charging and discharging power of the energy storage device, P is the rated output power of the thermal power plant, 0.3P is the minimum load rate of the thermal power plant, and 0.07P is the plant power load.

[0018] This preferred solution calculates the maximum charge and discharge power of the energy storage device through the rated equipment working information of the thermal power plant, and can accurately measure the electric energy flow relationship between the thermal power plant and the energy storage device, so as to better control the thermal power plant to charge the energy storage control device through the maximum charge and discharge power when the main power grid fails, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, ensuring the stable operation of the thermal power plant, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, achieving the maintenance of the minimum load of the thermal power plant under extreme conditions of the collapse of the main power grid, thereby ensuring the steady-state operation of the thermal power plant during power grid failure and ensuring the stable operation of the data center.

[0019] As a preferred solution, the energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions, specifically including:

[0020] When the data center meets the preset power supply conditions, the measurement and control unit is used to control the energy storage device to supply power to the data center at the maximum charge and discharge power, so that the energy storage device and the thermal power plant supply power to the data center until the power of the data center is at the rated power;

[0021] As a preferred solution, the step of maintaining the power of the data center at rated power further includes:

[0022] The measurement and control unit is used to reduce the discharge power of the energy storage device according to a preset discharge power control function, and to increase the discharge power of the thermal power plant until the discharge power of the energy storage device is zero.

[0023] As a preferred solution, the preset discharge power control function includes:

[0024]

[0025] Among them, P c is the discharge power of the energy storage device, P cmis the maximum charge and discharge power of the energy storage device, t1 is the time required from the start of discharge of the thermal power plant to the rated power of the data center, and t2 is the time required for the discharge power of the energy storage device to drop to zero.

[0026] This preferred solution controls the energy storage device and the thermal power plant to supply power to the data center, and gradually reduces the discharge power of the energy storage device according to the discharge power control function after the data center is at rated power, and simultaneously increases the output power of the thermal power plant, so that the energy storage device and the thermal power plant can stably provide electricity to the data center, ensuring that the data center can operate continuously and stably, and improving the stability of the data center.

[0027] As a preferred solution, the energy storage control method for a thermal power plant as a backup power supply for a data center further includes:

[0028] Acquiring the maximum charge and discharge power of the energy storage device based on the measurement and control unit, determining the rated capacity of the energy storage device, and outputting a rated energy storage control signal;

[0029] The rated energy storage control signal is used to control the thermal power plant to charge the energy storage device when the main power grid is in a rated working state, so that the electric energy stored in the energy storage device reaches a preset capacity value.

[0030] This preferred solution ensures that the energy storage device has sufficient electricity to provide to the data center by pre-storing electricity into the energy storage device when the main power grid is operating normally, ensuring that the data center can operate continuously and stably, thereby improving the stability of the data center.

[0031] Accordingly, an embodiment of the present invention provides an energy storage control system for a thermal power plant as a backup power source for a data center, comprising: a data center, a thermal power plant, a main power grid and an energy storage device; the energy storage device comprises: a measurement and control unit;

[0032] The measurement and control unit is used to obtain the rated equipment working information of the thermal power plant according to the energy storage control method of a thermal power plant as a backup power supply for a data center, calculate the maximum charge and discharge power of the energy storage device, and output an energy storage charging control signal and an energy storage discharging control signal;

[0033] The energy storage charging control signal is used to control the thermal power plant to charge the energy storage device according to the maximum charging and discharging power when the main power grid fails until the data center meets the preset power supply conditions;

[0034] The energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions.

[0035] As a preferred solution, the energy storage control system further includes a first transformer, a second transformer, a first switch, a second switch, a third switch and a fourth switch;

[0036] The output end of the thermal power plant is electrically connected to the input end of the first transformer;

[0037] The output end and the input end of the energy storage device are electrically connected to the output end of the thermal power plant respectively;

[0038] The output end of the first transformer is electrically connected to the first end of the first switch;

[0039] The second end of the first switch is electrically connected to the input end of the main power grid;

[0040] The output end of the first transformer is electrically connected to the first end of the second switch;

[0041] The second end of the second switch is electrically connected to the input end of the second transformer;

[0042] The first output terminal of the main power grid is electrically connected to the first terminal of the third switch;

[0043] The second end of the third switch is electrically connected to the input end of the second transformer;

[0044] The second output terminal of the main power grid is electrically connected to the first terminal of the fourth switch;

[0045] The second end of the fourth switch is electrically connected to the input end of the second transformer;

[0046] The output end of the second transformer is electrically connected to the input end of the data center.

[0047] As a preferred solution, the energy storage device includes: a measurement and control unit, a battery energy storage unit, a rectifier inverter device and an energy storage transformer;

[0048] The input end of the measurement and control unit is electrically connected to the output end of the thermal power plant;

[0049] The output terminal of the measurement and control unit is electrically connected to the control signal input terminal of the rectifier inverter device;

[0050] The first end of the energy storage transformer is electrically connected to the output end of the thermal power plant;

[0051] The second end of the energy storage transformer is electrically connected to the first end of the rectifier inverter device;

[0052] The second end of the rectifying and inverting device is electrically connected to the first end of the battery energy storage unit;

[0053] The first end of the energy storage transformer is used as an input end of the energy storage device to receive the electric energy output by the thermal power plant to the energy storage device;

[0054] The first end of the energy storage transformer is used as the output end of the energy storage device to charge the data center.

[0055] As a preferred solution, the battery energy storage unit is used to store electrical energy; the rectifier inverter device is used to realize the mutual conversion between AC power and DC power; and the energy storage transformer is used to step down the voltage output by the thermal power plant.

[0056] It can be understood that, compared with the prior art, this system obtains the rated equipment working information of the thermal power plant and calculates the maximum charge and discharge power of the energy storage control device, so that when a main power grid fails, the thermal power plant can be controlled to charge the energy storage control device according to the maximum charge and discharge power of the energy storage control device, and the energy storage control device and the thermal power plant can be controlled to supply power to the data center, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, and achieving the minimum load of the thermal power plant under extreme conditions of main power grid collapse, thereby ensuring the steady-state operation of the thermal power plant during power grid failure and ensuring the stable operation of the data center. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 : A schematic diagram of a connection of an existing thermal power plant as a backup power supply provided by an embodiment of the present invention;

[0058] Figure 2 : A schematic diagram of the structural connection of an energy storage control system for a thermal power plant used as a backup power supply for a data center provided by an embodiment of the present invention;

[0059] Figure 3 : An energy storage control method for a thermal power plant used as a backup power supply for a data center provided in an embodiment of the present invention;

[0060] Figure 4 : A power flow diagram of an energy storage control system for a thermal power plant used as a backup power source for a data center when a main power grid fails, provided by an embodiment of the present invention;

[0061] Figure 5 : A power flow diagram of an energy storage control system of a thermal power plant used as a backup power supply for a data center during the backup power supply input process provided by an embodiment of the present invention;

[0062] Figure 6 : A flow chart of another energy storage control method for a thermal power plant as a backup power supply for a data center provided by an embodiment of the present invention;

[0063] Figure 7: A schematic diagram of the structure of an energy storage device provided by an embodiment of the present invention;

[0064] Figure 8 : A speed and power variation curve of a thermal power plant generator when a power grid collapses provided by an embodiment of the present invention;

[0065] Fig. 9 : A load change curve of a data center when a backup power supply is put into use provided by an embodiment of the present invention;

[0066] Fig.10 : A frequency change curve of a data center when a backup power supply is put into use provided by an embodiment of the present invention;

[0067] Fig.11 : A curve of output power variation of a generator set of a thermal power plant when a backup power supply is put into use provided by an embodiment of the present invention;

[0068] Fig.12 : A curve showing a change in output power of an energy storage device when a backup power supply is used, provided by an embodiment of the present invention;

[0069] Fig.13 : A curve showing a change in energy stored in an energy storage device when a backup power supply is used, provided by an embodiment of the present invention;

[0070] Among them, 201: data center; 202: thermal power plant; 203: main power grid; 204: energy storage device; 2041: measurement and control unit; 2042: battery energy storage unit; 2043: rectifier inverter device; 2044: energy storage transformer; A1: first transformer; A2: second transformer; CB1: first switch; CB2: second switch; CB3: third switch; CB4: fourth switch. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] With the continuous deepening of modernization, data centers consume more and more energy, and their demand for load is getting higher and higher. The standard GB 50174-2017 "Data Center Design Specification" divides data centers into three levels: A, B, and C; GB50052-2009 "Power Supply and Distribution System Design Specification" divides loads into three levels: primary load, secondary load, and tertiary load; large data centers are both A-level data centers and primary loads, which stipulates that A-level data centers should be powered by dual power supplies and should have backup power supplies.

[0073] For Class A data centers, in the current existing technology, diesel generators are widely used as backup power sources for Class A data centers due to their compact structure, flexible installation locations, high thermal efficiency, and rapid start-up. However, with the expansion of data center scale and the increase in power density, the disadvantages of using diesel generators as backup power sources have gradually become apparent. For data centers with nearby thermal power plants, the nearby thermal power plants can be used to replace diesel generator sets as backup power sources for data centers.

[0074] Please refer to Figure 1 , which is a schematic diagram of the connection of an existing thermal power plant as a backup power supply provided by an embodiment of the present invention, such as Figure 1 As shown, there are some technical defects in existing thermal power plants as backup power sources. For example, when the main power grid collapses, the thermal power plant will be difficult to operate in a steady state due to a large amount of load shedding, and it takes a long time to achieve the effect of the backup power supply. Therefore, the embodiments of the present invention target this technical defect and propose a method and system for energy storage control of a thermal power plant as a backup power source for a data center to solve the technical defect of the thermal power plant as a backup power source for a Class A data center.

[0075] Embodiment 1

[0076] Please refer to Figure 2 , which is a structural connection diagram of an energy storage control system for a thermal power plant as a backup power supply for a data center provided in an embodiment of the present invention, including: a data center 201, a thermal power plant 202, a main power grid 203 and an energy storage device 204, wherein the energy storage device 204 includes: a measurement and control unit 2041.

[0077] Among them, the output end of the thermal power plant 202 is electrically connected to the input end of the main power grid 203; the output end of the thermal power plant 202 is electrically connected to the third input end of the data center 201; the first output end of the main power grid 203 is electrically connected to the first input end of the data center 201; the second output end of the main power grid 203 is electrically connected to the second input end of the data center 201; the output end and the input end of the energy storage device 204 are respectively electrically connected to the output end of the thermal power plant 202.

[0078] It should be noted that Figure 2 For a more detailed description, please refer to Example 2 below.

[0079] Please refer to Figure 3 , a method for controlling energy storage of a thermal power plant as a backup power supply for a data center provided by an embodiment of the present invention, including steps S101 to S103, which is applicable to Figure 2 The energy storage control system.

[0080] Step S101: Based on the measurement and control unit, the rated equipment operating information of the thermal power plant is obtained, and after the maximum charging and discharging power of the energy storage device is calculated, an energy storage charging control signal and an energy storage discharging control signal are output.

[0081] In this embodiment, the step of obtaining the rated equipment operating information of the thermal power plant based on the measurement and control unit and calculating the maximum charge and discharge power of the energy storage device specifically includes:

[0082] Based on the measurement and control unit, the rated equipment operation information of the thermal power plant is obtained, and the equipment operation information includes: the rated output power of the thermal power plant;

[0083] Determining the minimum load rate and plant power load of the thermal power plant according to the rated output power of the thermal power plant;

[0084] The maximum charge and discharge power of the energy storage device is determined according to the minimum load rate and the plant power load; wherein the maximum charge and discharge power expression of the energy storage device is:

[0085] P cm ≥0.3P+0.07P,

[0086] Among them, P cm is the maximum charging and discharging power of the energy storage device, P is the rated output power of the thermal power plant, 0.3P is the minimum load rate of the thermal power plant, and 0.07P is the plant power load.

[0087] This embodiment calculates the maximum charge and discharge power of the energy storage device through the rated equipment working information of the thermal power plant, and can accurately measure the electric energy flow relationship between the thermal power plant and the energy storage device, so as to better control the thermal power plant to charge the energy storage control device through the maximum charge and discharge power when the main power grid fails, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, ensuring the stable operation of the thermal power plant, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, achieving the maintenance of the minimum load of the thermal power plant under the extreme condition of the main power grid collapse, thereby ensuring the steady-state operation of the thermal power plant when the power grid fails and ensuring the stable operation of the data center.

[0088] Step S102: The output energy storage charging control signal is used to control the thermal power plant to charge the energy storage device based on the maximum charging and discharging power when the main power grid fails, until the data center meets the preset power supply conditions.

[0089] Please refer to Figure 4 , is a power flow diagram of an energy storage control system of a thermal power plant used as a backup power source for a data center when a main power grid fails, provided by an embodiment of the present invention; Figure 4 As shown, when a main power grid fails, the power of the thermal power plant flows to the energy storage device, that is, the thermal power plant charges the energy storage device.

[0090] Step S103: The energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions.

[0091] Please refer to Figure 5 , which is a power flow diagram of an energy storage control system of a thermal power plant used as a backup power supply for a data center during the backup power supply input process provided by an embodiment of the present invention; Figure 5 As shown, the power of the energy storage device and the thermal power plant flows to the data center, that is, the energy storage device and the thermal power plant charge the data center.

[0092] In this embodiment, the energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions, specifically including:

[0093] When the data center meets the preset power supply conditions, the measurement and control unit is used to control the energy storage device to supply power to the data center at the maximum charge and discharge power, so that the energy storage device and the thermal power plant supply power to the data center until the power of the data center is at the rated power;

[0094] In this embodiment, the step of maintaining the power of the data center at a rated power further includes:

[0095] The measurement and control unit is used to reduce the discharge power of the energy storage device according to a preset discharge power control function, and to increase the discharge power of the thermal power plant until the discharge power of the energy storage device is zero.

[0096] In this embodiment, the preset discharge power control function includes:

[0097]

[0098] Among them, P c is the discharge power of the energy storage device, P cm is the maximum charge and discharge power of the energy storage device, t1 is the time required from the start of discharge of the thermal power plant to the rated power of the data center, and t2 is the time required for the discharge power of the energy storage device to drop to zero.

[0099] This embodiment controls the energy storage device and the thermal power plant to supply power to the data center, and gradually reduces the discharge power of the energy storage device according to the discharge power control function after the data center is at rated power, and simultaneously increases the output power of the thermal power plant, so that the energy storage device and the thermal power plant can stably provide electricity to the data center, ensuring that the data center can operate continuously and stably, and improving the stability of the data center.

[0100] In this embodiment, the energy storage control method for a thermal power plant as a backup power source for a data center further includes:

[0101] Acquiring the maximum charge and discharge power of the energy storage device based on the measurement and control unit, determining the rated capacity of the energy storage device, and outputting a rated energy storage control signal;

[0102] The rated energy storage control signal is used to control the thermal power plant to charge the energy storage device when the main power grid is in a rated working state, so that the electric energy stored in the energy storage device reaches a preset capacity value.

[0103] It should be noted that the specific expression of the rated capacity of the energy storage device is W c ≥P cm ×1h, that is, the rated capacity of the energy storage device W c Not less than the maximum charge and discharge power P of the energy storage device cm Multiply by 1 hour; when the main power grid is in the rated working state, control the thermal power plant to charge the energy storage device to 60% of the rated capacity.

[0104] This embodiment stores electric energy in advance in the energy storage device when the main power grid is operating normally, thereby ensuring that the energy storage device has sufficient electric energy to provide to the data center, ensuring that the data center can operate continuously and stably, and improving the stability of the data center.

[0105] In an alternative embodiment, please refer to Figure 6 , which is a flow chart of another energy storage control method for a thermal power plant as a backup power supply for a data center provided by an embodiment of the present invention, such as Figure 6 As shown, first the state of the main grid is detected. When the main grid has not collapsed, the battery energy storage unit in the energy storage device is charged to 60%. When the main grid collapses, the thermal power plant charges the battery energy storage unit in the energy storage device at maximum power and determines whether the data center has the conditions to invest in a backup power supply. When the data center has the conditions to invest in a backup power supply, the battery energy storage unit in the energy storage device is discharged at maximum power until the power of the data center reaches the rated value; then the power of the data center is maintained unchanged, the output power of the energy storage unit in the energy storage device is reduced to 0 according to a linear law, and the thermal power plant increases the output power in equal proportion.

[0106] This embodiment obtains the rated equipment working information of the thermal power plant and calculates the maximum charge and discharge power of the energy storage control device, so that when a main power grid fails, the thermal power plant can be controlled to charge the energy storage control device according to the maximum charge and discharge power of the energy storage control device, and the energy storage control device and the thermal power plant can be controlled to supply power to the data center, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, achieving the minimum load of the thermal power plant under extreme conditions of main power grid collapse, thereby ensuring the steady-state operation of the thermal power plant during power grid failure and ensuring the stable operation of the data center.

[0107] Embodiment 2

[0108] Please refer to Figure 2 , which is a structural connection diagram of an energy storage control system for a thermal power plant as a backup power supply for a data center provided in an embodiment of the present invention, including: a data center 201, a thermal power plant 202, a main power grid 203 and an energy storage device 204, wherein the energy storage device 204 includes: a measurement and control unit 2041.

[0109] The measurement and control unit 2041 is used to obtain the rated equipment working information of the thermal power plant 202 according to the energy storage control method of a thermal power plant as a backup power supply for a data center as described in Example 1, calculate the maximum charge and discharge power of the energy storage device 204, and output an energy storage charging control signal and an energy storage discharging control signal;

[0110] The energy storage charging control signal is used to control the thermal power plant 202 to charge the energy storage device 204 according to the maximum charging and discharging power when the main power grid 203 fails, until the data center 201 meets the preset power supply conditions;

[0111] The energy storage discharge control signal is used to control the energy storage device 204 and the thermal power plant 202 to supply power to the data center when the data center 201 meets the preset power supply conditions.

[0112] In this embodiment, if Figure 2 As shown, the energy storage control system further includes a first transformer A1, a second transformer A2, a first switch CB1, a second switch CB2, a third switch CB3 and a fourth switch CB4;

[0113] The output end of the thermal power plant 202 is electrically connected to the input end of the first transformer A1;

[0114] The output end and the input end of the energy storage device 204 are electrically connected to the output end of the thermal power plant 202 respectively;

[0115] The output end of the first transformer A1 is electrically connected to the first end of the first switch CB1;

[0116] The second end of the first switch CB1 is electrically connected to the input end of the main power grid 203;

[0117] The output end of the first transformer A1 is electrically connected to the first end of the second switch CB2;

[0118] The second end of the second switch CB2 is electrically connected to the input end of the second transformer A2;

[0119] The first output terminal of the main grid 203 is electrically connected to the first terminal of the third switch CB3;

[0120] A second end of the third switch CB3 is electrically connected to an input end of the second transformer A2;

[0121] The second output terminal of the main grid 203 is electrically connected to the first terminal of the fourth switch CB4;

[0122] A second end of the fourth switch CB4 is electrically connected to an input end of the second transformer A2;

[0123] The output end of the second transformer A2 is electrically connected to the input end of the data center 201 .

[0124] Please refer to Figure 7 , is a schematic structural diagram of an energy storage device provided in an embodiment of the present invention.

[0125] In this embodiment, the energy storage device 204 includes: a measurement and control unit 2041, a battery energy storage unit 2042, a rectifier inverter device 2043 and an energy storage transformer 2044;

[0126] The input end of the measurement and control unit 2041 is electrically connected to the output end of the thermal power plant 202;

[0127] The output terminal of the measurement and control unit 2041 is electrically connected to the control signal input terminal of the rectifier inverter device 2043;

[0128] The first end of the energy storage transformer 2044 is electrically connected to the output end of the thermal power plant 202;

[0129] The second end of the energy storage transformer 2044 is electrically connected to the first end of the rectifier inverter device 2043;

[0130] The second end of the rectifying and inverting device 2043 is electrically connected to the first end of the battery energy storage unit 2042;

[0131] The first end of the energy storage transformer 2044 is used as an input end of the energy storage device 204 to receive the electric energy output by the thermal power plant 202 to the energy storage device 204;

[0132] The first end of the energy storage transformer 2044 is used as the output end of the energy storage device 204 to charge the data center 201 .

[0133] In this embodiment, the battery energy storage unit 2042 is used to store electric energy; the rectifier inverter device 2043 is used to realize the mutual conversion between AC power and DC power; and the energy storage transformer 2044 is used to step down the voltage output by the thermal power plant.

[0134] This embodiment obtains the rated equipment working information of the thermal power plant and calculates the maximum charge and discharge power of the energy storage control device, so that when a main power grid fails, the thermal power plant can be controlled to charge the energy storage control device according to the maximum charge and discharge power of the energy storage control device, and the energy storage control device and the thermal power plant can be controlled to supply power to the data center, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, achieving the minimum load of the thermal power plant under extreme conditions of main power grid collapse, thereby ensuring the steady-state operation of the thermal power plant during power grid failure and ensuring the stable operation of the data center.

[0135] Embodiment 3

[0136] This implementation will verify the energy storage control method and energy storage control system of Example 1 and Example 2. The specific process is as follows.

[0137] It should be noted that the rated power of the thermal power plant is P=700MW, the speed of the generator is 3000 rpm, the rated power of the data center is 500MW, and the power consumption of the thermal power plant is about 49MW; the configuration of the energy storage device is: energy storage power is 200MW, capacity is 100MAh, and the response time of the energy storage device is 0.1s.

[0138] Please refer to Figure 8 , is a speed and power variation curve of a thermal power plant generator when the power grid collapses, as provided by an embodiment of the present invention. Figure 8 As shown, the left figure is the power change curve, and the right figure is the speed change curve. When the main grid operates normally, the power transmitted by the thermal power plant to the main grid is 550MW. When the main grid collapses, the energy storage device starts with a delay of 0.1s and charges at a power of 100MW.

[0139] When the main power grid collapsed, the generator speed increased from 3000n / min to a maximum of 3209n / min in 9s, and stabilized at 3000n / min in 60s; the generator power dropped from 550MW before the fault to 48MW (i.e. the power load of the thermal power plant), and stabilized at about 126.5MW after 60s of oscillation attenuation. The thermal power plant was able to maintain a stable operation state.

[0140] Please refer to Fig. 9 , which is a load variation curve of a data center when a backup power supply is put into use provided by an embodiment of the present invention; Fig.10 , which is a frequency change curve of a data center when a backup power supply is put into use provided by an embodiment of the present invention; Fig.11 , which is a curve of output power variation of a generator set of a thermal power plant when a backup power supply is put into use, provided by an embodiment of the present invention; Fig.12 , which is a curve of the output power change of the energy storage device when the backup power supply is put into use provided by an embodiment of the present invention; Fig.13 , which is a curve of energy storage change of an energy storage device when a backup power supply is put into use, provided by an embodiment of the present invention.

[0141] It should be noted that when the main power grid collapsed, before the thermal power plant took on the load of the data center, the thermal power plant took on the plant power (49MW) and charged the energy storage device (200MW). The total load of the generator was about 250MW.

[0142] In an optional embodiment, when the thermal power plant is put into use as a backup power source, the energy storage device is converted from a charging mode to a maximum power discharging mode, and the thermal power plant increases its output power at a maximum ramp rate (a ramp rate of 3% or 5%). In the initial stage of the backup power source (thermal power plant) being put into use for the data center load, the energy storage device maintains the maximum output power (200MW). When the power of the data center reaches the rated power (500MW), the energy storage device gradually reduces its output in a linear manner (the battery output power decreases from 200MW to 0 within 15 minutes). When the energy storage device reduces its output, the thermal power plant continues to increase its output power until the entire load is borne by the thermal power plant.

[0143] like Figures 9 to 13 As shown in the figure, at the moment the backup power supply (thermal power plant) is put into use, the power of the data center can be increased to 400MW (the output of the power plant before being put into use + the battery output) within 0.1s, and then rise to the rated load (500MW) after 300s (6 minutes), that is, the switching time of the backup power supply is only 6 minutes.

[0144] like Figures 9 to 13As shown in the figure, in the first 300 seconds, the thermal power plant increases power at the maximum ramp speed, and the energy storage device maintains the maximum output power (200MW); during the period of 300s to 1200s (6min to 20min), the output power of the energy storage device gradually decreases to 0, the output power of the generator continues to increase, and the power of the data center remains unchanged; for 20 minutes, all loads are borne by the thermal power plant.

[0145] like Figures 9 to 13 As shown, the capacity of the energy storage device decreases from 60% when it is put into use to 18% when the backup power supply is switched. During the backup power supply switching process, the maximum frequency deviation is 0.131 Hz.

[0146] It can be seen from the above that the energy storage control method and energy storage control system of the first and second embodiments of the present invention can meet the requirements of the backup power supply of the data center.

[0147] In summary, the embodiment of the present invention obtains the rated equipment working information of the thermal power plant and calculates the maximum charge and discharge power of the energy storage control device, so that when a main power grid fails, the thermal power plant can be controlled to charge the energy storage control device according to the maximum charge and discharge power of the energy storage control device, and the energy storage control device and the thermal power plant can be controlled to supply power to the data center, thereby avoiding the thermal power plant from losing stability due to a large amount of load shedding, and improving the comprehensive climbing ability of the thermal power plant as a backup power supply for the data center, achieving the maintenance of the minimum load of the thermal power plant under extreme conditions of main power grid collapse, thereby ensuring the steady-state operation of the thermal power plant during power grid failure and ensuring the stable operation of the data center.

[0148] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling energy storage of a thermal power plant as a backup power source for a data center, characterized in that: Applicable to an energy storage control system, the energy storage control system includes: a data center, a thermal power plant, a main power grid and an energy storage device, the energy storage device includes: a measurement and control unit; The output end of the thermal power plant is electrically connected to the input end of the main power grid; the output end of the thermal power plant is electrically connected to the third input end of the data center; the first output end of the main power grid is electrically connected to the first input end of the data center; the second output end of the main power grid is electrically connected to the second input end of the data center; the output end and the input end of the energy storage device are electrically connected to the output end of the thermal power plant respectively; The energy storage control method of a thermal power plant as a backup power supply for a data center comprises: Based on the measurement and control unit, the rated equipment operating information of the thermal power plant is obtained, and after the maximum charge and discharge power of the energy storage device is calculated, an energy storage charging control signal and an energy storage discharging control signal are output; The output energy storage charging control signal is used to control the thermal power plant to charge the energy storage device based on the maximum charging and discharging power when the main power grid fails, until the data center meets the preset power supply conditions; The energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions.

2. The energy storage control method for a thermal power plant as a backup power supply for a data center according to claim 1, characterized in that: The step of obtaining rated equipment operating information of a thermal power plant based on the measurement and control unit and calculating the maximum charge and discharge power of the energy storage device specifically includes: Based on the measurement and control unit, the rated equipment operation information of the thermal power plant is obtained, and the equipment operation information includes: the rated output power of the thermal power plant; Determining the minimum load rate and plant power load of the thermal power plant according to the rated output power of the thermal power plant; The maximum charge and discharge power of the energy storage device is determined according to the minimum load rate and the plant power load; wherein the maximum charge and discharge power expression of the energy storage device is: P cm ≥0.3P+0.07P, Among them, P cm is the maximum charging and discharging power of the energy storage device, P is the rated output power of the thermal power plant, 0.3P is the minimum load rate of the thermal power plant, and 0.07P is the plant power load.

3. The energy storage control method of a thermal power plant as a backup power supply for a data center as claimed in claim 1 or 2, characterized in that: The energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions, specifically including: When the data center meets the preset power supply conditions, the measurement and control unit is used to control the energy storage device to supply power to the data center at the maximum charging and discharging power, so that the energy storage device and the thermal power plant supply power to the data center until the power of the data center is at the rated power.

4. The energy storage control method for a thermal power plant as a backup power supply for a data center as claimed in claim 3, characterized in that: Until the power of the data center reaches the rated power, it also includes: The measurement and control unit is used to reduce the discharge power of the energy storage device according to a preset discharge power control function, and to increase the output power of the thermal power plant until the discharge power of the energy storage device is zero.

5. The energy storage control method for a thermal power plant as a backup power supply for a data center as claimed in claim 4, characterized in that: The preset discharge power control function includes: Among them, P c is the discharge power of the energy storage device, P cm is the maximum charge and discharge power of the energy storage device, t1 is the time required for the thermal power plant to start supplying power to the data center until the data center is at rated power, and t2 is the time required for the discharge power of the energy storage device to drop to zero.

6. The energy storage control method for a thermal power plant as a backup power supply for a data center as claimed in claim 2, characterized in that: Also includes: Acquiring the maximum charge and discharge power of the energy storage device based on the measurement and control unit, determining the rated capacity of the energy storage device, and outputting a rated energy storage control signal; The rated energy storage control signal is used to control the thermal power plant to charge the energy storage device when the main power grid is in a rated working state, so that the electric energy stored in the energy storage device reaches a preset capacity value.

7. An energy storage control system for a thermal power plant as a backup power source for a data center, characterized in that: include: Data centers, thermal power plants, main power grids and energy storage devices; The energy storage device comprises: a measurement and control unit; The measurement and control unit is used to obtain the rated equipment working information of the thermal power plant according to the energy storage control method of a thermal power plant as a backup power supply for a data center as described in any one of claims 1 to 6, calculate the maximum charge and discharge power of the energy storage device, and output an energy storage charging control signal and an energy storage discharging control signal; The energy storage charging control signal is used to control the thermal power plant to charge the energy storage device according to the maximum charging and discharging power when the main power grid fails until the data center meets the preset power supply conditions; The energy storage discharge control signal is used to control the energy storage device and the thermal power plant to supply power to the data center when the data center meets the preset power supply conditions.

8. The energy storage control system of a thermal power plant as a backup power supply for a data center as claimed in claim 7, characterized in that: Also includes a first transformer, a second transformer, a first switch, a second switch, a third switch and a fourth switch; The output end of the thermal power plant is electrically connected to the input end of the first transformer; The output end and the input end of the energy storage device are electrically connected to the output end of the thermal power plant respectively; The output end of the first transformer is electrically connected to the first end of the first switch; The second end of the first switch is electrically connected to the input end of the main power grid; The output end of the first transformer is electrically connected to the first end of the second switch; The second end of the second switch is electrically connected to the input end of the second transformer; The first output terminal of the main power grid is electrically connected to the first terminal of the third switch; The second end of the third switch is electrically connected to the input end of the second transformer; The second output terminal of the main power grid is electrically connected to the first terminal of the fourth switch; The second end of the fourth switch is electrically connected to the input end of the second transformer; The output end of the second transformer is electrically connected to the input end of the data center.

9. The energy storage control system of a thermal power plant as a backup power supply for a data center as claimed in claim 8, characterized in that: The energy storage device comprises: a measurement and control unit, a battery energy storage unit, a rectifier inverter device and an energy storage transformer; The input end of the measurement and control unit is electrically connected to the output end of the thermal power plant; The output terminal of the measurement and control unit is electrically connected to the control signal input terminal of the rectifier inverter device; The first end of the energy storage transformer is electrically connected to the output end of the thermal power plant; The second end of the energy storage transformer is electrically connected to the first end of the rectifier inverter device; The second end of the rectifying and inverting device is electrically connected to the first end of the battery energy storage unit; The first end of the energy storage transformer is used as an input end of the energy storage device to receive the electric energy output by the thermal power plant to the energy storage device; The first end of the energy storage transformer is used as the output end of the energy storage device to charge the data center.

10. The energy storage control system of a thermal power plant as a backup power supply for a data center as claimed in claim 9, characterized in that: The battery energy storage unit is used to store electric energy; the rectifier inverter is used to realize the mutual conversion between alternating current and direct current; and the energy storage transformer is used to step down the voltage output by the thermal power plant.

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