Combined operation method of gas turbine and energy storage system and island system

Abstract

The embodiment of the invention discloses a combined operation method and system of a gas turbine and an energy storage system, relates to the technical field of electric power system engineering, and is used for solving the problems that coordination control of an existing combined operation mode is difficult, and seamless switching of a power supply during non-planned shutdown of the gas turbine cannot be achieved. The method comprises the following steps: detecting output alternating voltage of the gas turbine and the energy storage system according to a synchronizing device in the synchronizing control system to obtain a detection result; controlling parallel combined operation of the energy storage system and the gas turbine according to a detection result; the running states of the gas turbine and the energy storage system are obtained based on real-time monitoring of a monitoring system, and corresponding charging and discharging power instructions are sent to the energy storage system based on running problems corresponding to the running states so as to ensure that the gas turbine always works in the optimal efficiency range; wherein when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charging and discharging power instruction is preferentially sent to a grid-connected energy storage system in the energy storage system.

Description

Technical Field

[0001] This specification relates to the technical field of power system engineering, and particularly to a combined operation method of a gas turbine and an energy storage system and an island system. Background Art

[0002] In order to increase the oil production of oil wells, the oil and gas reservoir fracturing process is generally adopted. However, since oil fields are generally located in remote areas and it is inconvenient to erect power grids, and the fracturing machine belongs to a high-power load, currently, a gas turbine is generally used to supply power to it. In this case, to ensure the continuous operation of the fracturing machine, standby units are usually set up for the gas turbine to ensure that the fracturing machine can still be powered when one gas turbine fails or is shut down for maintenance. Moreover, the currently dominant gas turbines abroad are extremely costly. Therefore, in the case where the electrochemical energy storage system develops rapidly, the cost decreases, and the technology is mature, a combined operation method of a gas turbine and an energy storage system is adopted to use the energy storage to replace part of the gas turbine, achieving the purposes of cost reduction, protection of the gas turbine, and elimination of standby units.

[0003] However, in the existing combined operation methods of gas turbines and energy storage systems, only one of the energy storage and the gas turbine can be used as a voltage source, and the other needs to be connected in a grid-connected mode. If the gas turbine is used as the voltage source and the energy storage operates in a grid-connected mode, when the load power suddenly increases or decreases, the control system responds untimely, and the energy storage still executes the original command. The impact load power is mainly provided by the gas turbine, which is likely to exceed its capacity limit, resulting in shutdown and system collapse. In addition, when the gas turbine shuts down, the energy storage system needs to perform island detection and mode conversion, and there is a switching interval of seconds, which affects the continuity of load power supply. Summary of the Invention

[0004] To solve the above technical problems, one or more embodiments of this specification provide a combined operation method of a gas turbine and an energy storage system and an island system.

[0005] One or more embodiments of this specification adopt the following technical solutions: One or more embodiments of this specification provide a combined operation method of a gas turbine and an energy storage system, which is applied to an island system including a gas turbine, an energy storage system, a synchronization control system, and a monitoring system. Among them, the synchronization control system is respectively connected to a high-voltage AC bus and the gas turbine, and the energy storage system is connected in parallel with the high-voltage AC bus. The method includes: Detect the output AC voltages of the gas turbine and the energy storage system according to the synchronization device in the synchronization control system to obtain a detection result; wherein, the energy storage system includes: an energy storage battery and an energy storage converter, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system; in the grid-connected and off-grid hybrid energy storage system, a part of the energy storage converters operate in the off-grid droop mode, and the remaining energy storage converters operate in the grid-connected mode; in the fully off-grid energy storage system, all the energy storage converters operate in the off-grid droop mode; Control the parallel combined operation of the energy storage system and the gas turbine according to the detection result; During the parallel combined operation, monitor and obtain the operating states of the gas turbine and the energy storage system in real time based on the monitoring system; Based on the operation problems corresponding to the operating states, the monitoring system sends corresponding charge and discharge power commands to the energy storage system to ensure the normal combined operation of the gas turbine and the energy storage system; wherein, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charge and discharge power commands are preferentially sent to the energy storage converters in the grid-connected mode. If the charge and discharge power commands exceed the capacity of the energy storage converters in the grid-connected mode, the remaining power is borne by the energy storage converters in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, the charge and discharge power commands are jointly borne by all the energy storage converters in the off-grid droop mode.

[0006] Optionally, in one or more embodiments of the present specification, before detecting the output AC voltages of the gas turbine and the energy storage system according to the synchronization device in the synchronization control system to obtain a detection result, the method further includes: Determine the energy storage converters operating in the off-grid droop mode in the energy storage system; wherein, the off-grid droop mode includes: active / frequency and reactive / voltage; Start the energy storage converters operating in the off-grid droop mode to establish a fixed output AC voltage of the energy storage system; wherein, the fixed output AC voltage has a fixed voltage and a fixed frequency; Start the gas turbine to adjust the operating mode of the gas turbine according to the preset fast voltage regulator and the preset automatic generation control system corresponding to the gas turbine.

[0007] Optionally, in one or more embodiments of the present specification, controlling the parallel combined operation of the energy storage system and the gas turbine according to the detection result specifically includes: Based on the detection result, determine whether the difference between the output AC voltages of the gas turbine and the energy storage system is less than a preset threshold; wherein, the difference includes: amplitude difference and phase difference; If it is less than a preset threshold value, the circuit breaker in the synchronization control system is controlled based on the synchronization device to perform closing, so as to realize the parallel combined operation of the energy storage system and the gas turbine; wherein, the circuit breaker is located between the high-voltage AC bus and the gas turbine.

[0008] Optionally, in one or more embodiments of the present specification, during the parallel combined operation, the operation states of the gas turbine and the energy storage system are monitored and obtained in real time based on the monitoring system, specifically including: During the parallel combined operation, through various types of sensors in the monitoring system and a fast Ethernet architecture based on the GOOSE protocol, the data corresponding to the gas turbine and the energy storage system and their operation states are monitored and obtained in real time.

[0009] Optionally, in one or more embodiments of the present specification, the monitoring system sends corresponding charge and discharge power commands to the energy storage system based on the operation problems corresponding to the operation states, specifically including: If the monitoring system determines, based on the operation state, that the operation problem is that the CT value of the gas turbine exceeds a preset first CT threshold value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, a corresponding discharge power command is sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system, and when the energy storage system is a fully off-grid energy storage system, the corresponding discharge power is sent to the energy storage converter in the off-grid mode; If the monitoring system determines, based on the operation state, that the operation problem is that the CT value of the gas turbine is less than a preset second CT threshold value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, a corresponding charge power command is sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system, and when the energy storage system is a fully off-grid energy storage system, the corresponding charge power is sent to the energy storage converter in the off-grid mode.

[0010] Optionally, in one or more embodiments of the present specification, the monitoring system sends corresponding charge and discharge power commands to the energy storage system based on the operation problems corresponding to the operation states, specifically including: If the monitoring system determines, based on the operation state, that the operation problem is that the SOC value of the energy storage system exceeds a preset first SOC value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, a corresponding discharge power command is sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system, and when the energy storage system is a fully off-grid energy storage system, the corresponding discharge power is sent to the energy storage converter in the off-grid mode; If the monitoring system determines, based on the operating state, that the operating problem is that the SOC value of the energy storage system is lower than a preset first SOC value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding charging power command is sent to the energy storage converter in the grid-connected mode in the grid-connected and off-grid hybrid energy storage system; when the energy storage system is a fully off-grid energy storage system, the corresponding charging power is sent to the energy storage converter in the off-grid mode.

[0011] Optionally, in one or more embodiments of the present specification, the monitoring system sends the corresponding charge and discharge power commands to the energy storage system based on the operating problem corresponding to the operating state, specifically including: If the monitoring system determines, based on the operating state, that the operating problem is a sudden increase in load power, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the energy storage converter in the off-grid droop mode in the grid-connected and off-grid hybrid energy storage system bears the impact power corresponding to the sudden increase in load power; Trigger a discharge power command corresponding to the sudden increase in load power, and preferentially send the discharge power command to the energy storage converter in the grid-connected mode. If the discharge power command exceeds the capacity of the energy storage converter in the grid-connected mode, the remaining power is borne by the energy storage converter in the off-grid droop mode for the sudden increase in load power; when the energy storage system is a fully off-grid energy storage system, all energy storage converters in the off-grid droop mode bear the impact power corresponding to the sudden increase in load power, and trigger a discharge power command to be jointly borne by all energy storage converters in the off-grid droop mode for the sudden increase in load power; If the monitoring system determines, based on the operating state, that the operating problem is a sudden decrease in load power, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the energy storage converter in the off-grid droop mode in the grid-connected and off-grid hybrid energy storage system bears the impact power corresponding to the sudden increase in load power; Trigger a charging power command corresponding to the sudden decrease in load power, and preferentially send the charging power command to the energy storage converter in the grid-connected mode. If the charging power command exceeds the capacity of the energy storage converter in the grid-connected mode, the remaining power is borne by the energy storage converter in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, all energy storage converters in the off-grid droop mode bear the impact power corresponding to the sudden decrease in load power, and trigger a discharge power command to be jointly borne by all energy storage converters in the off-grid droop mode for the sudden decrease in load power; Wherein, after the monitoring system determines that the operating problem is a sudden increase in load power based on the operating state, the method further includes: Gradually adjust the fixed frequency of the gas turbine to transfer the load power of the energy storage system to the gas turbine.

[0012] Optionally, in one or more embodiments of this specification, after the monitoring system determines an operation problem corresponding to the operation state, the method further includes: If the monitoring system determines, based on the operation state, that the operation problem is an unplanned shutdown of the gas turbine, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the energy storage converter in the off-grid droop mode within the energy storage system is used to drive the load power corresponding to the gas turbine for operation; If the load power is greater than the capacity of the energy storage converter in the off-grid droop mode, the energy storage converters in the grid-connected mode are sequentially converted to the off-grid droop mode to assume the load power; When the energy storage system is a fully off-grid energy storage system, all the energy storage converters in the off-grid droop mode are used to drive the load power corresponding to the gas turbine for operation.

[0013] One or more embodiments of this specification provide an island system for a gas turbine and an energy storage system. The system includes: a gas turbine, an energy storage system, a synchronization control system, and a monitoring system for the island system; wherein, the synchronization control system is respectively connected to a high-voltage AC bus and the gas turbine, and the energy storage system is connected in parallel with the high-voltage AC bus; The synchronization control system is configured to detect the output AC voltages of the gas turbine and the energy storage system through a built-in synchronization device to obtain a detection result, and based on the detection result, control the parallel combined operation of the energy storage system and the gas turbine; wherein, the energy storage system includes: energy storage batteries and energy storage converters, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system; in the grid-connected and off-grid hybrid energy storage system, a part of the energy storage converters operate in the off-grid droop mode, and the remaining energy storage converters operate in the grid-connected mode; in the fully off-grid energy storage system, all the energy storage converters operate in the off-grid droop mode; The monitoring system is configured to, during the parallel combined operation, monitor and obtain the operation states of the gas turbine and the energy storage system in real time; Based on the operation problem corresponding to the operation state, send a corresponding charge-discharge power command to the energy storage system; The energy storage system is configured to adjust the load power based on the charge-discharge power command to ensure the normal combined operation of the gas turbine and the energy storage system; wherein, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charge-discharge power command is preferentially sent to the energy storage converters in the grid-connected mode, and if the charge-discharge power command exceeds the capacity of the energy storage converters in the grid-connected mode, the remaining power is borne by the energy storage converters in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, the charge-discharge power command is jointly borne by all the energy storage converters in the off-grid droop mode.

[0014] Optionally, in one or more embodiments of the present specification, according to the detection result, controlling the parallel combined operation of the energy storage system and the gas turbine specifically includes: Based on the detection result, determining whether the difference between the output AC voltages of the gas turbine and the energy storage system is less than a preset threshold; wherein, the difference includes: amplitude difference, phase difference; If it is less than the preset threshold, then based on the synchronization device, controlling the circuit breaker in the synchronization control system to close the switch, so as to realize the parallel combined operation of the energy storage system and the gas turbine; wherein, the circuit breaker is located between the high-voltage AC bus and the gas turbine.

[0015] The above at least one technical solution adopted in the embodiments of the present specification can achieve the following beneficial effects: By using the synchronization device in the synchronization control system to detect the output AC voltages of the gas turbine and the energy storage system, it is ensured that the parallel combined operation is carried out only when the key parameters such as voltage amplitude and phase match, effectively avoiding the impact current caused by the closing of the switch due to voltage mismatch, ensuring the safety of electrical equipment, and laying a foundation for the stable operation of the system. The monitoring system monitors the operating states of the gas turbine and the energy storage system in real time, and can timely discover various operating problems. Based on these problems, sending charge and discharge power commands to the energy storage system in a timely manner, quickly responding to and solving the problems in operation, ensuring the normal combined operation of the gas turbine and the energy storage system, enhancing the adaptability and reliability of the system to various working conditions. And by adjusting the charge and discharge power of the energy storage system through the charge and discharge power commands, the output power of the gas turbine is made smoother, avoiding the problem of the gas turbine overcapacity shutdown caused by excessive power impact, enhancing the ability of the island system to cope with emergencies, and extending the service life of the gas turbine. And the coordinated control of the gas turbine and the energy storage system is realized, and the problem of the gas turbine running in reverse power and being damaged is solved. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings. In the drawings: Figure 1 It is a schematic flow chart of a method for the combined operation of a gas turbine and an energy storage system provided by an embodiment of the present specification; Figure 2 It is a schematic diagram of an island system of a gas turbine combined with an off-grid hybrid energy storage provided by an embodiment of the present specification; Figure 3Schematic diagram of an island system with a gas turbine combined with a fully off-grid energy storage provided by an embodiment of this specification; Figure 4 Schematic diagram of the startup operation principle of a fully off-grid energy storage system provided by an embodiment of this specification; Figure 5 Schematic diagram of the operation principle of a gas turbine combined with a fully off-grid energy storage when suddenly increasing the load provided by an embodiment of this specification; Figure 6 Schematic diagram of the operation principle of a grid-connected and off-grid hybrid energy storage system after increasing the discharge power command provided by an embodiment of this specification; Figure 7 Schematic diagram of the operation principle of a fully off-grid energy storage system after increasing the discharge power command provided by an embodiment of this specification; Figure 8 Schematic diagram of the operation principle of a grid-connected and off-grid hybrid energy storage system after the gas turbine shuts down provided by an embodiment of this specification; Figure 9 Schematic diagram of the operation principle of a fully off-grid energy storage system after the gas turbine shuts down provided by an embodiment of this specification. Specific implementation manners

[0017] An embodiment of this specification provides a combined operation method and an island system for a gas turbine and an energy storage system.

[0018] In order to enable those skilled in the art to better understand the technical solutions in this specification, the following will clearly and completely describe the technical solutions in the embodiments of this specification with reference to the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this specification.

[0019] As Figure 1 shown, an embodiment of this specification provides a schematic diagram of the flow of a combined operation method for a gas turbine and an energy storage system. As Figure 1 can be seen, in one or more embodiments of this specification, a combined operation method for a gas turbine and an energy storage system is applied to an island system including an energy storage system, a synchronization control system, and a monitoring system as Figure 2 shown, wherein as Figure 2 shown, the synchronization control system is respectively connected to the high-voltage AC bus and the gas turbine, and the energy storage system is connected in parallel with the high-voltage AC bus. In addition, it should be noted that the energy storage system can be a grid-connected and off-grid hybrid energy storage system as Figure 2 shown, or can be a fully off-grid energy storage system as Figure 3The fully off-grid energy storage system shown. Therefore, when a combined operation method of a gas turbine and an energy storage system is applied to the above-mentioned island system, the method includes the following steps: S101: Detect the output AC voltages of the gas turbine and the energy storage system according to the synchronization device in the synchronization control system to obtain a detection result; wherein, the energy storage system includes: energy storage batteries and an energy storage converter, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system; in the grid-connected and off-grid hybrid energy storage system, part of the energy storage converters operate in the off-grid droop mode, and the remaining energy storage converters operate in the grid-connected mode; in the fully off-grid energy storage system, all energy storage converters operate in the off-grid droop mode.

[0020] The parallel combined operation of the energy storage system and the gas turbine requires the two to maintain coordination in electrical characteristics. Therefore, in order to ensure the smooth parallel combined operation of the energy storage system and the gas turbine by controlling the closing time, in the embodiments of this specification, the output AC voltages of the gas turbine and the energy storage system will be detected according to the synchronization device in the synchronization control system to obtain a detection result, so as to ensure that the island system operates at a stable voltage and frequency. Among them, it should be noted that as Figure 2 and Figure 3 shown, the energy storage system includes: energy storage batteries and an energy storage converter, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system. In addition, in the grid-connected and off-grid hybrid energy storage system, part of the energy storage converters operate in the off-grid droop mode to provide voltage support for the entire island system, and the remaining energy storage converters operate in the grid-connected mode to jointly bear the load power with the gas turbine; while in the fully off-grid energy storage system, all energy storage converters operate in the off-grid droop mode.

[0021] Further, before detecting the output AC voltages of the gas turbine and the energy storage system according to the synchronization device in the synchronization control system to obtain a detection result in one or more embodiments of this specification, the method further includes the following process: First, determine the energy storage converters corresponding to each energy storage system in the energy storage system that operate in the off-grid droop mode; wherein, the off-grid droop mode includes: active / frequency and reactive / voltage. To start the energy storage converters operating in the off-grid droop mode to establish a fixed output AC voltage of the energy storage system; wherein, the fixed output AC voltage has a fixed voltage and a fixed frequency. Then start the gas turbine to adjust the operating mode of the gas turbine according to the preset fast voltage regulator and the preset automatic generation control system corresponding to the gas turbine. That is, the energy storage converters operating in the off-grid droop mode are turned on to establish an AC voltage with a fixed voltage and frequency. As shown in the appendix Figure 4The AC voltage established by the energy storage converter operating in the off-grid droop mode is 50 Hz, and the output power at no load is 0 kW. In addition, the auxiliary system of the gas turbine, including the igniter, starts to work after being powered on, and the gas turbine starts. The high-power gas turbine operates in the constant voltage and constant frequency mode, where the voltage is regulated by a preset fast voltage regulator (AVC), and the frequency is regulated by a threshold automatic generation control system (AGC).

[0022] In this process, the energy storage converter in the off-grid droop mode is first determined and started to establish a fixed output AC voltage, providing a stable initial electrical environment for the entire system. After the energy storage converter establishes a stable AC voltage, the gas turbine is started, and its operating mode is adjusted through the preset fast voltage regulator (AVC) and the preset automatic generation control system (AGC), enabling the gas turbine to smoothly reach the constant voltage and constant frequency operating state. This helps the gas turbine better adapt to the system requirements during startup, reduces power fluctuations and impacts on equipment during startup, and extends the service life of the gas turbine.

[0023] S102: According to the detection result, control the parallel combined operation of the energy storage system and the gas turbine.

[0024] After obtaining the detection result based on the above step S101, as Figure 2 shown, the gas turbine is connected to the high-voltage AC bus through the circuit breaker in the synchronization control system. Therefore, when it is necessary to perform parallel combined operation with the energy storage system, the synchronization control system will control the circuit breaker to close only when the detection result shows stable voltage and frequency. Specifically, in one or more embodiments of this specification, controlling the parallel combined operation of the energy storage system and the gas turbine according to the detection result includes the following process: Determine whether the difference between the output AC voltages of the gas turbine and the energy storage system is less than a preset threshold according to the detection result. Among them, it can be understood that the difference includes: amplitude difference, phase difference. If it is less than the preset threshold, then the synchronization device controls the circuit breaker in the synchronization control system to close, as Figure 2 shown, it is necessary to control Figure 2 the circuit breaker QF in to close to achieve the parallel combined operation of the energy storage system and the gas turbine. Among them, it can be seen from Figure 2 that the circuit breaker is located between the high-voltage AC bus and the gas turbine.

[0025] In the power system, the voltage amplitudes of different power sources need to be matched as closely as possible. Otherwise, problems such as unbalanced power distribution and equipment overload may occur. By detecting and comparing the voltage amplitudes of the AC side of the energy storage converter and the AC voltage output by the gas turbine, closing the switch only when the amplitude difference is less than a preset threshold ensures that when operating in parallel, the voltage amplitudes of the two power sources are within a reasonable matching range, enabling electrical equipment to operate normally at the rated voltage and avoiding damage to the equipment caused by too high or too low voltage. Inconsistent voltage phases will cause a phase difference, leading to the generation of circulating current. Circulating current not only increases line losses but may also affect the normal operation of equipment and even cause faults. Controlling the phase difference within the preset threshold when closing the switch can effectively solve the problem of phase mismatch, ensure that the voltage phases of the two power sources are synchronized when operating in parallel, avoid the generation of circulating current, and improve the stability and reliability of the power system.

[0026] S103: During the parallel combined operation, based on the monitoring system, the operating states of the gas turbine and the energy storage system are monitored and obtained in real time.

[0027] In the current existing combined operation mode of gas turbines and energy storage systems, when the load power suddenly increases or decreases, since the control system cannot respond in time and the energy storage still executes the previous power command, in fact, the power of the impact load is still provided by the gas turbine. Once it exceeds the capacity limit of the gas turbine, it is very easy to cause the gas turbine to shut down, resulting in the collapse of the entire system. In addition, when the gas turbine is shut down for maintenance or suddenly fails, the energy storage system needs to perform island detection and then switch from the grid-connected mode to the off-grid mode. There is a switching interval of seconds in the middle, and the continuity of load power supply will inevitably be affected. And the temperature at the outlet of the compressor of the gas turbine (Compressor Temperature Value, abbreviated as CT), this temperature is an important parameter during the operation of the gas turbine because it directly affects the performance and efficiency of the gas turbine. However, in the existing technology, no effective solution has been proposed to monitor and adjust the CT value of the gas turbine in real time to maintain the best efficiency of the gas turbine. Therefore, in the embodiments of this specification, in order to effectively avoid the adverse effects brought by the above problems, the combined operation of the gas turbine and the energy storage system needs to be monitored in real time. Therefore, in the embodiments of this specification, during the parallel combined operation, the operating states of the gas turbine and the energy storage system will be monitored and obtained in real time according to the monitoring system in the island system, including changes in load power, the CT value of the gas turbine, the SOC value of the energy storage system, etc. On this basis, once abnormal situations are detected, such as sudden increase or decrease in load power, too high or too low CT value, too low SOC value, etc., the monitoring system can immediately react and adjust the output power of the energy storage system to ensure the normal operation of the combined operation of the gas turbine and the energy storage system.

[0028] Specifically, in one or more embodiments of this specification, during the parallel combined operation, the operating states of the gas turbine and the energy storage system are obtained through real-time monitoring by the monitoring system, which specifically includes: during the parallel combined operation, through various types of sensors in the monitoring system and the fast Ethernet architecture based on the GOOSE protocol, the corresponding data and operating states of the gas turbine and the energy storage system are obtained through real-time monitoring.

[0029] S104: Based on the operating problems corresponding to the operating state, the monitoring system sends the corresponding charge-discharge power command to the energy storage system to ensure the normal combined operation of the gas turbine and the energy storage system; wherein, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charge-discharge power command is preferentially sent to the energy storage converter in the grid-connected mode. If the charge-discharge power command exceeds the capacity of the energy storage converter in the grid-connected mode, the remaining power is borne by the energy storage converter in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, the charge-discharge power command is jointly borne by all off-grid energy storage systems.

[0030] After obtaining the operating states of the gas turbine and the energy storage system through the above monitoring system, in order to comprehensively utilize the characteristics that the energy storage system can operate independently without a gas turbine in the off-grid droop mode, and to solve the problems that when the gas turbine is used as a voltage source and the energy storage is connected to the grid for operation, the control system responds untimely when the load power suddenly changes, the impact load is likely to cause the gas turbine to trip due to overcapacity and the system to collapse, and seamless switching between grid-connected and off-grid cannot be achieved, affecting the power supply continuity, and when the energy storage adopts the grid-forming control technology and operates in parallel with other power sources, it is difficult to achieve coordinated control of the system, the adjustment response of the gas turbine is slow, which will cause large fluctuations in the output power of the energy storage and slow response to the command, and even lead to reverse power operation of the gas turbine and damage. In the embodiments of this specification, the monitoring system sends the corresponding charge and discharge power commands to the energy storage system based on the operating problems corresponding to the operating states to ensure the normal combined operation of the gas turbine and the energy storage system. Since the energy storage system is divided into a grid-connected / off-grid hybrid energy storage system and a fully off-grid energy storage system, in the grid-connected / off-grid hybrid energy storage system, if all the energy storage operates in the off-grid mode and is connected in parallel with other power sources such as a diesel generator or a gas turbine, all the power sources in the system are voltage sources, and the coordinated control is difficult. Moreover, the actual output power of the energy storage system in the off-grid droop control mode is determined by the active power command and the active power droop determined by the deviation between the bus frequency and the rated power. Therefore, when the gas turbine is limited by the AGC (Automatic Generation Control System) and AVC (Automatic Voltage Regulator) and the response speed of adjusting the frequency and voltage is slow or there is slight oscillation, the output power of the energy storage system in the off-grid droop control mode also fluctuates greatly, and the speed of responding to the power command is slow. In some cases, it may even cause reverse power operation of the gas turbine and damage the gas turbine. Therefore, when the energy storage system is a grid-connected / off-grid hybrid energy storage system, the charge and discharge power commands are sent to the energy storage converter in the grid-connected mode, and the energy storage converter in the grid-connected mode can respond to this command instantaneously (within 100 ms), thereby adjusting the output power of the gas turbine and avoiding problems such as reverse power. In the fully off-grid hybrid energy storage system, when the gas turbine is out of service for maintenance or suddenly fails and shuts down, since the energy storage system originally operates in the off-grid mode, it can directly continue to drive the load to operate without complex mode conversion and island detection. Sending the charge and discharge commands to the energy storage converter in the off-grid mode can truly achieve seamless switching between grid-connected and off-grid, ensuring that the load does not lose power and greatly improving the reliability of the power supply. In the above process, whether it is a grid-connected / off-grid hybrid energy storage system or a fully off-grid energy storage system, it can give targeted control strategies according to the change of the load power. For sudden increase or decrease of the load power, appropriate charge and discharge commands are sent to the energy storage converters in different modes respectively, which improves the ability of the system to cope with complex working conditions and expands the applicable range.

[0031] Specifically, in one or more embodiments of this specification, the monitoring system sends the corresponding charge and discharge power commands to the energy storage system based on the operating problems corresponding to the operating states, which specifically includes the following process: If the monitoring system determines, based on the operating status, that the operating problem is a sudden increase in load power, then in the embodiments of this specification, the corresponding discharge power command will be sent to the energy storage system. That is, if it is desired that the energy storage system and the gas turbine evenly divide or distribute the increased load power according to a certain ratio, a certain discharge power command can be issued to the energy storage system through the monitoring and control system, so as to achieve the purpose of power sharing. If it is determined that the operating problem is a sudden decrease in load power, then in the embodiments of this specification, the corresponding charging power command will be sent to the energy storage system.

[0032] As described above, since the energy storage system may be a hybrid grid-connected and off-grid energy storage system or a fully off-grid energy storage system, when it is determined that the operating problem is a sudden increase in load power and the energy storage system is a hybrid grid-connected and off-grid energy storage system, because the actual output power of the energy storage system in the off-grid droop control mode is determined by the active power command and the active power droop amount determined by the deviation between the bus frequency and the rated power, when the gas turbine is limited by the slow response speed or slight oscillation of the automatic generation control system AGC and the automatic voltage regulator AVC in regulating the frequency and voltage, the output power of the energy storage system in the off-grid droop control mode also fluctuates greatly, and the response speed to the power command is slow. In some cases, it may even cause reverse power operation of the gas turbine, resulting in damage to the gas turbine. Therefore, to solve this problem, as shown in the appendix Figure 6 In the hybrid grid-connected and off-grid energy storage system, the monitoring system issues a 500 kW discharge command to the energy storage system operating in the grid-connected mode, and the operating point of the droop curve of the energy storage system moves from Figure 6 point 2 to point 3 in. The energy storage system operating in the grid-connected mode and the gas turbine each bear 500 kW of power, and the energy storage system in the off-grid mode does not bear the load power. If the monitoring system determines that the operating problem is a sudden decrease in load power and the energy storage system is a hybrid grid-connected and off-grid energy storage system, then the corresponding charging power command will be sent to the grid-connected energy storage system in the energy storage system. That is, when the load power suddenly decreases, it will first cause the bus frequency to increase. At this time, the energy storage converter in the off-grid droop mode responds instantaneously and will first bear this part of the reduced load power, that is, the output power decreases instantaneously, and even changes from the discharge state to the charging state. When the energy storage system is a hybrid grid-connected and off-grid energy storage system, the impact power is borne by the off-grid part of the energy storage converter. Then the AGC system of the gas turbine plays a regulating role and gradually reduces the frequency to the rated frequency. During this process, the output power of the gas turbine will also gradually decrease. Finally, after stabilization, the reduced output power is the power of the sudden load reduction. If during this process, the monitoring and control system finds that the output power of the gas turbine gradually decreases and there is even a risk of reverse power, a certain charging power command can be issued to the energy storage converter in the grid-connected mode, and the energy storage converter in the grid-connected mode can respond to this command instantaneously (within 100 ms), thereby increasing the output power of the gas turbine and avoiding reverse power.

[0033] When it is determined that the operation problem is a sudden increase in load power and the energy storage system is an off-grid energy storage system, since the fully off-grid energy storage system operates in the off-grid droop mode, the power output is related to the voltage and frequency of the parallel high-voltage DC bus. When the load suddenly increases, it will cause the bus frequency to suddenly decrease. At this time, the energy storage converter in the off-grid droop mode responds instantaneously and will first bear this increased part of the load power. In order to utilize the fast response speed of the off-grid droop mode of the energy storage system, when the load power suddenly increases or decreases, all the energy storage converters in the fully off-grid energy storage system quickly bear the changing power, reduce the output power fluctuation of the gas turbine, and reduce the impact on it. The corresponding discharge power will be sent to the energy storage converter in the off-grid mode, such as Figure 7 shown, the monitoring and control system issues a 500 kW discharge command to the energy storage system, and the operating point of the energy storage system's droop curve transfers from point 2 to point 3 in Figure 7 . The energy storage system and the gas turbine each bear 500 kW of power. When it is determined that the operation problem is a sudden decrease in load power and the energy storage system is an off-grid energy storage system, the corresponding charging power will be sent to the energy storage converter in the off-grid mode. It can be understood that when the load power suddenly decreases, it will first cause the bus frequency to increase. At this time, the energy storage system responds instantaneously and will first bear this decreased part of the load power, that is, the output power decreases instantaneously, and even changes from the discharge state to the charging state. Then, the AGC system of the gas turbine plays a regulating role and gradually reduces the frequency to the rated frequency. During this process, the gas turbine will also gradually reduce its output power. Finally, after stabilization, the reduced output power is the power of the sudden load reduction.

[0034] Among them, after the monitoring system determines that the operation problem is a sudden increase or decrease in load power based on the operation state, the method may further include the following process: Obtain the droop curve of the energy storage system, and then gradually adjust the fixed frequency of the gas turbine according to the droop curve, so as to transfer the load power of the energy storage system to the gas turbine. That is, when the load power suddenly increases, it will first cause the bus frequency to decrease. At this time, the energy storage system responds instantaneously and will first bear this increased part of the load power, such as in the appendix Figure 5As shown in the figure, in a schematic diagram of the operating principle of a gas turbine combined with a fully off-grid energy storage system during sudden load increase, the operating point of the energy storage system's droop curve shifts from point 1 to point 2. Then, the AGC system of the gas turbine plays a regulatory role and gradually raises the frequency to the rated frequency. During this process, the increased load power will gradually transfer from the energy storage system to the gas turbine. The operating point of the energy storage system's droop curve returns from point 2 to point 1. Similarly, when the load power suddenly decreases, it will first cause the bus frequency to increase. At this time, the energy storage converter in the off-grid droop mode responds instantaneously and will first bear this part of the reduced load power, that is, the output power decreases instantaneously, and may even change from the discharging state to the charging state. Then, the AGC system of the gas turbine plays a regulatory role and gradually reduces the frequency to the rated frequency. During this process, the gas turbine will also gradually reduce its output power. Finally, after stabilization, the reduced output power is the power of the sudden load reduction.

[0035] In the above process, for the problem of sudden change in load power, charge and discharge commands can be quickly issued. When the load power suddenly increases, the energy storage system discharges in time to share the load of the gas turbine and relieve the power impact; when the load power suddenly decreases, the energy storage system charges to absorb the excess power and stabilize the bus frequency. This effectively reduces the impact of power fluctuations on the system and ensures the stable operation of the system. Preferably, in the grid-connected and off-grid hybrid energy storage system, in the face of the problems of slow frequency regulation and voltage response or oscillation of the gas turbine, by regulating the power command of the grid-connected mode energy storage system, the large fluctuation of the output power of the off-grid droop mode energy storage system is avoided, the reverse power operation of the gas turbine is prevented, the risk of gas turbine damage is reduced, and its service life is extended.

[0036] Specifically, in a feasible embodiment of this specification, the monitoring system sends the corresponding charge and discharge power commands to the energy storage system based on the operating problems corresponding to the operating state, specifically including: The CT value of the temperature of the gas turbine refers to the temperature at the outlet of the compressor. This temperature is an important parameter during the operation of the gas turbine because it directly affects the performance and efficiency of the gas turbine. However, in the existing technology, no effective solution has been proposed to monitor and adjust the CT value of the gas turbine temperature in real time to maintain the best efficiency of the gas turbine. In the embodiment of this specification, if the monitoring system determines based on the operating state that the operating problem is that the CT value of the gas turbine exceeds the preset first CT threshold, that is, when the CT value is too high, it will send a discharge power command to the energy storage system. And if the monitoring system determines based on the operating state that the operating problem is that the CT value of the gas turbine is less than the preset second CT threshold, that is, when the CT value is too low, it will send the corresponding charge power command to the energy storage system.

[0037] Specifically, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, if the CT value is too high, the corresponding discharge power command will be sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system, thereby reducing the output power of the gas turbine. If the CT value is too low, the charging power command will be sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system, that is, the real-time monitoring and control system can reduce the discharge power command for the energy storage converter in the grid-connected mode, and even issue a charging power command, thereby increasing the output power of the gas turbine. When the energy storage system is a fully off-grid energy storage system, if the CT value is too high, the corresponding discharge power command will be sent to the energy storage converter in the off-grid mode, and if the CT value is too low, the corresponding charging power command will be sent to the energy storage converter in the off-grid mode. This process adjusts the output power of the energy storage system through charge and discharge commands, so that the CT value is maintained within the normal range, ensuring that the gas turbine is always in the best operating state, improving energy utilization efficiency, and reducing operating costs.

[0038] Specifically, in a feasible embodiment of this specification, the monitoring system sends the corresponding charge and discharge power commands to the energy storage system based on the operation problems corresponding to the operation states, which specifically includes the following process: If the monitoring system determines based on the operation state that the operation problem is that the SOC value of the energy storage system exceeds the preset first SOC value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding discharge power command will be sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system. When the energy storage system is a fully off-grid energy storage system, the corresponding discharge power will be sent to the energy storage converter in the off-grid mode. Conversely, if the monitoring system determines based on the operation state that the operation problem is that the SOC value of the energy storage system is lower than the preset first SOC value, at this time, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding charging power command will be sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system. When the energy storage system is a fully off-grid energy storage system, the corresponding charging power will be sent to the energy storage converter in the off-grid mode. That is, in this process, the monitoring system of the control system monitors the SOC value of the energy storage system in real time. When the SOC is too low, the energy storage system is charged in time, so as to ensure that the energy storage system can respond to load changes in time and operate for a long time, enhancing the reliability and stability of the entire energy storage system.

[0039] Specifically, in a feasible embodiment of this specification, the monitoring system sends the corresponding charge and discharge power commands to the energy storage system based on the operation problems corresponding to the operation states, which specifically includes the following process: If the monitoring system determines based on the operation state that the operation problem is that the gas turbine stops running, then the off-grid energy storage system in the energy storage system will be used to drive the load corresponding to the gas turbine to run. As shown in the appendix Figure 8, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the working point of the droop curve of the energy storage system transfers from point 3 to point 4. The energy storage systems in the off-grid mode and the grid-connected mode within the grid-connected and off-grid hybrid energy storage system each bear a power of 500 kW, achieving a seamless switch in the true sense and enabling the load to operate without power interruption. That is, during the above process, a seamless switch of the grid-connected and off-grid operation of the energy storage system is realized when the gas turbine has a planned or unplanned shutdown. When the gas turbine is shut down for maintenance or suddenly fails, the energy storage converter in the off-grid droop mode in the system continues to work. At this time, the energy storage system can directly continue to drive the load to operate, achieving a seamless switch in the true sense and ensuring the continuous power supply of the load. It solves the problems of output power fluctuation and reverse power of the gas turbine when the grid-forming energy storage system is coordinated with the gas turbine. And the combined operation method of the gas turbine and the energy storage system corresponding to the above process does not require large-scale transformation of the existing gas turbine and energy storage system, and is easy to promote and implement. As for Figure 9 shown, when the energy storage system is a fully off-grid energy storage system, since the fully off-grid energy storage system already operates in the off-grid mode, it can directly continue to drive the load to operate. The working point of the droop curve of the fully off-grid energy storage system transfers from point 3 to point 4, and the energy storage system bears all the 1 MW power, also achieving a seamless switch in the true sense and enabling the load to operate without power interruption.

[0040] As Figure 2 shown, an island system of a gas turbine and an energy storage system is provided in an embodiment of this specification. The system includes: An island system of a grid-connected and off-grid hybrid energy storage system, a synchronization control system, and a monitoring system; wherein, the synchronization control system is respectively connected to the high-voltage AC bus and the gas turbine, and the grid-connected and off-grid hybrid energy storage system is connected in parallel with the high-voltage AC bus; The synchronization control system is used to detect the output AC voltage of the gas turbine and the energy storage system through a built-in synchronization device to obtain a detection result, and to control the parallel combined operation of the energy storage system and the gas turbine according to the detection result; wherein, the energy storage system includes: energy storage batteries and an energy storage converter, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system; in the grid-connected and off-grid hybrid energy storage system, a part of the energy storage converters operate in the off-grid droop model, and the remaining energy storage converters operate in the grid-connected model; in the fully off-grid energy storage system, all the energy storage converters operate in the off-grid droop mode; The monitoring system is used to, during the parallel combined operation, monitor and obtain the operation states of the gas turbine and the energy storage system in real time; Based on the operation problems corresponding to the operation states, send corresponding charge and discharge power commands to the energy storage system; The energy storage system is used to adjust the load power based on the charge-discharge power command to ensure the normal combined operation of the gas turbine and the energy storage system. When the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charge-discharge power command is sent to the energy storage converter in the grid-connected mode. When the energy storage system is a fully off-grid energy storage system, the charge-discharge command is sent to the energy storage converter in the off-grid mode.

[0041] That is, it can be understood that the above energy storage system mainly includes an energy storage battery and an energy storage converter. The energy storage battery provides an energy source for the energy storage converter. In a grid-connected and off-grid hybrid energy storage system, part of the energy storage converter operates in the off-grid droop mode to provide voltage support for the entire island system, and the other part operates in the grid-connected mode to jointly bear the load power with the gas turbine. The synchronization control system includes a synchronization device and a parallel circuit breaker. The synchronization device is used to detect the amplitude and phase of the AC voltage at the AC terminal of the energy storage converter and the AC voltage output by the gas turbine. When the difference between the two is less than a certain threshold, the circuit breaker is controlled to close to achieve the parallel combined operation of the energy storage system and the gas turbine. The monitoring system can monitor the operating states of the gas turbine and the energy storage system in real time, including changes in load power, the CT value of the gas turbine temperature, the SOC value of the energy storage system, etc. Once an abnormal situation is detected, such as a sudden increase or decrease in load power, too high or too low CT value, too low SOC value, etc., the system can immediately respond and adjust the output power of the energy storage system.

[0042] Further, in one or more embodiments of this specification, controlling the parallel combined operation of the energy storage system and the gas turbine according to the detection result specifically includes: Based on the detection result, determining whether the difference between the output AC voltages of the gas turbine and the energy storage system is less than a preset threshold; where the difference includes: amplitude difference, phase difference; If it is less than the preset threshold, then based on the synchronization device, control the circuit breaker in the synchronization control system to close to achieve the parallel combined operation of the energy storage system and the gas turbine; where the circuit breaker is located between the high-voltage AC bus and the gas turbine.

[0043] Each embodiment in this specification is described in a progressive manner. The same or similar parts between each embodiment can be referred to each other, and the key points of each embodiment are the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments.

[0044] The specific embodiments of this specification have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain implementations, multitasking and parallel processing are also possible or may be advantageous.

[0045] The above description is only for one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, various changes and modifications can be made to one or more embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of one or more embodiments of this specification shall be included within the scope of the claims of this specification.

Claims

1. A combined operation method of a gas turbine and an energy storage system, applied to an island system including a gas turbine, an energy storage system, a synchronous control system and a monitoring system, wherein: The synchronous control system is connected to the high-voltage AC bus and the gas turbine respectively, the energy storage system is connected in parallel to the high-voltage AC bus, and the method includes: The output AC voltage of the gas turbine and the energy storage system is detected according to the synchronization device in the synchronization control system to obtain the detection result; wherein the energy storage system includes: an energy storage battery and an energy storage inverter, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system; in the grid-connected and off-grid hybrid energy storage system, a part of the energy storage inverters work in the off-grid droop mode, and the rest of the energy storage inverters work in the grid-connected mode; in the fully off-grid energy storage system, all the energy storage inverters work in the off-grid droop mode; According to the detection result, controlling the energy storage system and the gas turbine to operate in parallel; During the parallel joint operation, the operating status of the gas turbine and the energy storage system is acquired based on the real-time monitoring of the monitoring system; Based on the operating problems corresponding to the operating status, the monitoring system sends corresponding charging and discharging power instructions to the energy storage system to ensure the normal joint operation of the gas turbine and the energy storage system; wherein, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charging and discharging power instructions are preferentially sent to the energy storage inverter in the grid-connected mode. If the charging and discharging power instructions exceed the capacity of the energy storage inverter in the grid-connected mode, the remaining power is borne by the energy storage inverter in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, the charging and discharging power instructions are jointly borne by all energy storage inverters in the off-grid droop mode.

2. A combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: The method further comprises: detecting the output AC voltage of the gas turbine and the energy storage system according to the synchronization device in the synchronization control system, before obtaining the detection result: Determine an energy storage converter in the energy storage system that operates in an off-grid droop mode; wherein the off-grid droop mode includes: active power / frequency and reactive power / voltage; Starting the energy storage converter operating in the off-grid droop mode to establish a fixed output AC voltage of the energy storage system; wherein the fixed output AC voltage has a fixed voltage and a fixed frequency; The gas turbine is started to adjust the working mode of the gas turbine according to a preset fast voltage regulator and a preset automatic power generation control system corresponding to the gas turbine.

3. A combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: According to the detection result, controlling the energy storage system and the gas turbine to operate in parallel, specifically comprising: Determine based on the detection result whether the difference between the output AC voltage of the gas turbine and the output AC voltage of the energy storage system is less than a preset threshold; wherein the difference includes: an amplitude difference and a phase difference; If it is less than a preset threshold, the circuit breaker in the synchronization control system is controlled to close based on the synchronization device to achieve parallel joint operation of the energy storage system and the gas turbine; wherein the circuit breaker is located between the high-voltage AC bus and the gas turbine.

4. A combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: During the parallel joint operation, obtaining the operating status of the gas turbine and the energy storage system based on the real-time monitoring of the monitoring system specifically includes: During the parallel joint operation, the data and operation status corresponding to the gas turbine and the energy storage system are acquired through real-time monitoring through multiple types of sensors in the monitoring system and a fast Ethernet architecture based on the GOOSE protocol.

5. The combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: The monitoring system sends corresponding charging and discharging power instructions to the energy storage system based on the operating problem corresponding to the operating state, specifically including: If the monitoring system determines, based on the operating status, that the operating problem is that the CT value of the gas turbine exceeds the preset first CT threshold, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding discharge power instruction is sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system; when the energy storage system is a fully off-grid energy storage system, the corresponding discharge power is sent to the energy storage converter in the off-grid mode; If the monitoring system determines, based on the operating status, that the operating problem is that the CT value of the gas turbine is less than a preset second CT threshold, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding charging power instruction is sent to the energy storage inverter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system; when the energy storage system is a fully off-grid energy storage system, the corresponding charging power is sent to the energy storage inverter in the off-grid mode.

6. A combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: The monitoring system sends corresponding charging and discharging power instructions to the energy storage system based on the operating problem corresponding to the operating state, specifically including: If the monitoring system determines, based on the operating state, that the operating problem is that the SOC value of the energy storage system exceeds a preset first SOC value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding discharge power instruction is sent to the energy storage converter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system; when the energy storage system is a fully off-grid energy storage system, the corresponding discharge power is sent to the energy storage converter in the off-grid mode; If the monitoring system determines, based on the operating status, that the operating problem is that the SOC value of the energy storage system is lower than a preset first SOC value, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the corresponding charging power instruction is sent to the energy storage inverter in the grid-connected mode of the grid-connected and off-grid hybrid energy storage system; when the energy storage system is a fully off-grid energy storage system, the corresponding charging power is sent to the energy storage inverter in the off-grid mode.

7. A combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: The monitoring system sends corresponding charging and discharging power instructions to the energy storage system based on the operating problem corresponding to the operating state, specifically including: If the monitoring system determines that the operating problem is a sudden increase in load power based on the operating state, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the energy storage converter in the off-grid droop mode of the grid-connected and off-grid hybrid energy storage system bears the impact power corresponding to the sudden increase in load power; Triggering a discharge power instruction corresponding to the sudden increase in load power, so as to preferentially send the discharge power instruction to the energy storage inverter in the grid-connected mode; if the discharge power instruction exceeds the capacity of the energy storage inverter in the grid-connected mode, the remaining power is borne by the energy storage inverter in the off-grid droop mode to bear the sudden increase in load power; when the energy storage system is a fully off-grid energy storage system, the energy storage inverters in all off-grid droop modes bear the impact power corresponding to the sudden increase in load power, and triggering the discharge power instruction so that all off-grid droop modes of energy storage inverters jointly bear the sudden increase in load power; If the monitoring system determines that the operating problem is a sudden decrease in load power based on the operating state, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the energy storage converter in the off-grid droop mode of the grid-connected and off-grid hybrid energy storage system bears the impact power corresponding to the sudden increase in load power; Triggering a charging power instruction corresponding to the sudden reduction in load power, so as to preferentially send the charging power instruction to the energy storage inverter in the grid-connected mode; if the charging power instruction exceeds the capacity of the energy storage inverter in the grid-connected mode, the remaining power is borne by the energy storage inverter in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, the energy storage inverters in all off-grid droop modes bear the impact power corresponding to the sudden reduction in load power, and triggering a discharge power instruction so that all off-grid droop modes of energy storage inverters jointly bear the sudden reduction in load power; Wherein, if the monitoring system determines that the operating problem is a sudden increase in load power based on the operating state, the method further includes: The fixed frequency of the gas turbine is gradually adjusted to transfer the load power of the energy storage system to the gas turbine.

8. The combined operation method of a gas turbine and an energy storage system according to claim 1, characterized in that: After the monitoring system determines the operation problem corresponding to the operation state, the method further includes: If the monitoring system determines that the operating problem is an unplanned shutdown of the gas turbine based on the operating status, then when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the energy storage converter in the off-grid droop mode within the energy storage system drives the load power corresponding to the gas turbine to operate; If the load power is greater than the capacity of the energy storage converter in the off-grid droop mode, the energy storage converter in the grid-connected mode is sequentially converted to the off-grid droop mode to bear the load power; When the energy storage system is a fully off-grid energy storage system, the energy storage converters in all off-grid droop modes drive the gas turbine to operate at the load power corresponding to the gas turbine.

9. An island system of a gas turbine and an energy storage system, characterized in that: The system comprises: an island system of a gas turbine, an energy storage system, a synchronous control system and a monitoring system; wherein the synchronous control system is connected to a high-voltage AC bus and a gas turbine respectively, and the energy storage system is connected in parallel to the high-voltage AC bus; The synchronization control system is used to detect the output AC voltage of the gas turbine and the energy storage system through the built-in synchronization device to obtain the detection result, so as to control the parallel joint operation of the energy storage system and the gas turbine according to the detection result; wherein the energy storage system includes: an energy storage battery and an energy storage inverter, and the energy storage system is a grid-connected and off-grid hybrid energy storage system or a fully off-grid energy storage system; in the grid-connected and off-grid hybrid energy storage system, a part of the energy storage inverters work in the off-grid droop mode, and the rest of the energy storage inverters work in the grid-connected mode; in the fully off-grid energy storage system, all the energy storage inverters work in the off-grid droop mode; The monitoring system is used for real-time monitoring and obtaining the operating status of the gas turbine and the energy storage system during the parallel joint operation; Based on the operating problem corresponding to the operating state, sending a corresponding charge and discharge power instruction to the energy storage system; The energy storage system is used to adjust the load power based on the charge and discharge power instructions to ensure the normal joint operation of the gas turbine and the energy storage system; wherein, when the energy storage system is a grid-connected and off-grid hybrid energy storage system, the charge and discharge power instructions are preferentially sent to the energy storage inverter in the grid-connected mode. If the charge and discharge power instructions exceed the capacity of the energy storage inverter in the grid-connected mode, the remaining power is borne by the energy storage inverter in the off-grid droop mode; when the energy storage system is a fully off-grid energy storage system, the charge and discharge power instructions are jointly borne by all energy storage inverters in the off-grid droop mode.

10. The island system of a gas turbine and an energy storage system according to claim 9, characterized in that: According to the detection result, controlling the energy storage system and the gas turbine to operate in parallel, specifically comprising: Determine based on the detection result whether the difference between the output AC voltage of the gas turbine and the output AC voltage of the energy storage system is less than a preset threshold; wherein the difference includes: an amplitude difference and a phase difference; If it is less than a preset threshold, the circuit breaker in the synchronization control system is controlled to close based on the synchronization device to achieve parallel joint operation of the energy storage system and the gas turbine; wherein the circuit breaker is located between the high-voltage AC bus and the gas turbine.

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