A method and device for energy control of flexible interconnected distribution network

Abstract

The present application discloses an energy control method and device for a flexible interconnected distribution network, the method comprising: obtaining real-time output information of new energy units through smart meters, and collecting real-time status of electric-hydrogen hybrid energy storage systems through energy storage information collection systems, determining energy control requirements of the flexible interconnected distribution network based on real-time output information and real-time status, generating energy control instructions for energy control requirements through a comprehensive energy management system, and driving the electric-hydrogen hybrid energy storage system to perform energy control based on the energy control instructions for energy control requirements. It can be seen that the electric-hydrogen hybrid energy storage system in the flexible interconnected distribution network mixes hydrogen energy storage systems and battery energy storage systems, so that the flexible interconnected distribution network can meet different energy control requirements. Battery energy storage systems are mainly used in short-time scale scenarios, and hydrogen energy storage systems are mainly used in long-time scale scenarios, realizing the complementary advantages of hydrogen energy storage systems and battery energy storage systems.

Description

Technical Field

[0001] The present application relates to the technical field of interconnected distribution networks, and more specifically, to an energy control method and device for a flexible interconnected distribution network. Background Art

[0002] With the continuous increase in electricity consumption and the rapid development of new energy technologies, the penetration rate of distributed power sources in flexible interconnected distribution networks is increasing. The output of new energy is random, volatile and intermittent, making it difficult for flexible interconnected distribution network systems to balance power and energy at multiple time scales. At present, energy storage technology can be used to improve the negative impact of new energy grid connection. Battery energy storage has a fast charging and discharging rate and can absorb or provide transient and peak power. Hydrogen energy storage has the advantages of high energy density, low self-loss rate and green environmental protection.

[0003] However, a single energy storage technology cannot simultaneously meet various requirements on different time scales, and battery energy storage has high power cost and self-damage rate.

[0004] How to use hybrid energy storage technology to complement the advantages of energy storage power and energy to meet the various energy storage needs of flexible interconnected distribution networks is an issue that needs attention. Summary of the invention

[0005] In view of the above problems, the present application is proposed to provide an energy regulation method and device for a flexible interconnected distribution network to meet the various energy storage requirements of the flexible interconnected distribution network.

[0006] In order to achieve the above objectives, the specific plan is proposed as follows:

[0007] An energy control method for a flexible interconnected distribution network is applied to a flexible interconnected distribution network, wherein the flexible interconnected distribution network includes an electric-hydrogen hybrid energy storage system, an integrated energy management system, an energy storage information collection system, a smart meter, an energy storage converter and a new energy unit;

[0008] The method includes:

[0009] Acquire the real-time output information of the new energy unit through the smart meter, and acquire the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system;

[0010] Determining energy regulation requirements of the flexible interconnected distribution network based on the real-time output information and the real-time status;

[0011] Generate energy control instructions for the energy control requirements through an integrated energy management system;

[0012] An energy control instruction of the energy control demand is issued to the energy storage converter, and energy control is performed based on the energy control instruction by the electric-hydrogen hybrid energy storage system.

[0013] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a frequency regulation demand;

[0014] The electric-hydrogen hybrid energy storage system performs energy regulation based on the energy regulation instruction, including:

[0015] When the frequency of the flexible interconnected distribution network fluctuates positively and the power required for frequency modulation is greater than the output power of the alkaline electrolyzer in the previous period, the output power of the alkaline electrolyzer is maintained, and the output power of the battery energy storage system is adjusted to the difference between the power required for frequency modulation and the output power of the alkaline electrolyzer;

[0016] When the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency modulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency modulation is greater than the minimum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to the charging power required for frequency modulation;

[0017] When the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency modulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency modulation is not greater than the minimum operating power of the alkaline electrolyzer, driving the battery energy storage system to discharge so that the alkaline electrolyzer operates at its minimum operating power;

[0018] When the frequency of the flexible interconnected power distribution network fluctuates in the opposite direction, the battery energy storage system is driven to discharge so that the alkaline electrolyzer operates at its minimum operating power.

[0019] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a consumption demand, but does not include a frequency regulation demand;

[0020] The electric-hydrogen hybrid energy storage system performs energy regulation based on the energy regulation instruction, including:

[0021] When the power required for consumption is less than the minimum operating power of the alkaline electrolyzer, and the alkaline electrolyzer has been started in the previous period, the output power of the alkaline electrolyzer is set to the minimum operating power of the alkaline electrolyzer, and the battery energy storage system is driven to discharge;

[0022] When the power required for consumption is less than the minimum operating power of the alkaline electrolyzer, and the alkaline electrolyzer has not been started in the previous period, the output power of the battery energy storage system is set to the power required for consumption, and the output power of the hydrogen energy storage system is set to 0;

[0023] When the power required for consumption is not less than the maximum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to its maximum operating power, and the output power of the battery energy storage system is set to the difference between the power required for consumption and the maximum operating power of the alkaline electrolyzer.

[0024] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer and a fuel cell, and the energy regulation demand includes a power prediction compensation demand, and does not include a consumption demand and a frequency regulation demand;

[0025] The electric-hydrogen hybrid energy storage system performs energy regulation based on the energy regulation instruction, including:

[0026] When the power required for the power prediction compensation is not less than the rated power of the battery energy storage system, the output power of the battery energy storage system is set to its rated power, and the output power of the hydrogen energy storage system is set to the difference between the power required for the power prediction compensation and the rated power of the battery energy storage system, the output power of the hydrogen energy storage system includes the output power of the alkaline electrolyzer and the output power of the fuel cell;

[0027] When the power required by the power prediction compensation is less than the rated power of the battery energy storage system, the output power of the battery energy storage system is set to the power required by the power prediction compensation, and the output power of the hydrogen energy storage system is set to 0.

[0028] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, and the energy regulation demand does not include consumption demand, frequency regulation demand and power prediction compensation demand;

[0029] The electric-hydrogen hybrid energy storage system performs energy regulation based on the energy regulation instruction, including:

[0030] When the power of the battery energy storage system is greater than a first preset power, driving the hydrogen energy storage system to charge;

[0031] When the power of the battery energy storage system is less than a second preset power, the hydrogen energy storage system is driven to discharge, and the first preset power is not less than the second preset power.

[0032] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a charge balance recovery demand, and does not include a consumption demand, a frequency regulation demand, and a power forecast compensation demand;

[0033] The electric-hydrogen hybrid energy storage system performs energy regulation based on the energy regulation instruction, including:

[0034] When the power of the battery energy storage system is greater than a first preset power, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is greater than the maximum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to its maximum operating power;

[0035] When the power of the battery energy storage system is greater than a first preset power, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is less than the minimum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to 0;

[0036] When the power of the battery energy storage system is greater than a first preset power, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is between the minimum operating power of the alkaline electrolyzer and the maximum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to the power required for the power prediction compensation;

[0037] When the power of the battery energy storage system is greater than a first preset power and the alkaline electrolyzer has not been started in the previous period, the output power of the alkaline electrolyzer is set to 0.

[0038] Optionally, the hydrogen energy storage system also includes a hydrogen storage tank and a hydrogen load.

[0039] Optionally, the flexible interconnected distribution network further includes a new energy converter, and the new energy converter is connected to the new energy unit.

[0040] An energy control device for a flexible interconnected distribution network is applied to a flexible interconnected distribution network, wherein the flexible interconnected distribution network includes an electric-hydrogen hybrid energy storage system, an integrated energy management system, an energy storage information collection system, an energy storage converter and a new energy generator set;

[0041] The device includes:

[0042] A real-time information acquisition unit, used to acquire the real-time output information of the new energy unit through the smart meter, and to acquire the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system;

[0043] A regulation demand determining unit, configured to determine an energy regulation demand of the flexible interconnected distribution network based on the real-time output information and the real-time status;

[0044] A control instruction generating unit, used for generating an energy control instruction for the energy control demand through an integrated energy management system;

[0045] The energy control execution unit is used to send the energy control instruction of the energy control demand to the energy storage converter, and perform energy control based on the energy control instruction through the electric-hydrogen hybrid energy storage system.

[0046] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a frequency regulation demand;

[0047] The energy control execution unit includes:

[0048] The first frequency modulation demand control unit is used to maintain the output power of the alkaline electrolyzer when the frequency of the flexible interconnected distribution network fluctuates positively and the power of the frequency modulation demand is greater than the output power of the alkaline electrolyzer in the previous period, and adjust the output power of the battery energy storage system to the difference between the power of the frequency modulation demand and the output power of the alkaline electrolyzer;

[0049] The second frequency modulation demand control unit is used to set the output power of the alkaline electrolyzer to the charging power of the frequency modulation demand when the frequency of the flexible interconnected distribution network fluctuates positively and the power of the frequency modulation demand is not greater than the output power of the alkaline electrolyzer in the previous period and the power of the frequency modulation demand is greater than the minimum operating power of the alkaline electrolyzer;

[0050] The third frequency regulation unit is used to drive the battery energy storage system to discharge when the frequency of the flexible interconnected distribution network fluctuates positively, and the power of the frequency regulation demand is not greater than the output power of the alkaline electrolyzer in the previous period, and the power of the frequency regulation demand is not greater than the minimum operating power of the alkaline electrolyzer, so that the alkaline electrolyzer operates at its minimum operating power;

[0051] The fourth control unit for frequency regulation demand is used to drive the battery energy storage system to discharge when the frequency of the flexible interconnected distribution network fluctuates in the opposite direction, so that the alkaline electrolyzer operates at its minimum operating power.

[0052] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a consumption demand, but does not include a frequency regulation demand;

[0053] The energy control execution unit includes:

[0054] a first control unit for accommodating demand, configured to set the output power of the alkaline electrolyzer to the minimum operating power of the alkaline electrolyzer and drive the battery energy storage system to discharge when the power of the accommodating demand is less than the minimum operating power of the alkaline electrolyzer and the alkaline electrolyzer has been started in the previous period;

[0055] The second regulation unit for accommodating demand is used to set the output power of the battery energy storage system to the power of the consumption demand and to set the output power of the hydrogen energy storage system to 0 when the power of the consumption demand is less than the minimum operating power of the alkaline electrolyzer and the alkaline electrolyzer has not been started in the previous period;

[0056] The third regulation unit for accommodating demand is used to set the output power of the alkaline electrolyzer to its maximum operating power when the power of the accommodating demand is not less than the maximum operating power of the alkaline electrolyzer, and to set the output power of the battery energy storage system to the difference between the power of the accommodating demand and the maximum operating power of the alkaline electrolyzer.

[0057] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer and a fuel cell, and the energy regulation demand includes a power prediction compensation demand, and does not include a consumption demand and a frequency regulation demand;

[0058] The energy control execution unit includes:

[0059] a first compensation demand control unit, configured to set the output power of the battery energy storage system to its rated power when the power of the power prediction compensation demand is not less than the rated power of the battery energy storage system, and to set the output power of the hydrogen energy storage system to the difference between the power of the power prediction compensation demand and the rated power of the battery energy storage system, wherein the output power of the hydrogen energy storage system includes the output power of the alkaline electrolyzer and the output power of the fuel cell;

[0060] The second compensation demand control unit is used to set the output power of the battery energy storage system to the power of the power prediction compensation demand and set the output power of the hydrogen energy storage system to 0 when the power of the power prediction compensation demand is less than the rated power of the battery energy storage system.

[0061] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, and the energy regulation demand does not include consumption demand, frequency regulation demand and power prediction compensation demand;

[0062] The energy control execution unit includes:

[0063] A charging control unit, configured to drive the hydrogen energy storage system to charge when the power of the battery energy storage system is greater than a first preset power;

[0064] A discharge control unit is used to drive the hydrogen energy storage system to discharge when the power of the battery energy storage system is less than a second preset power, and the first preset power is not less than the second preset power.

[0065] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a charge balance recovery demand, and does not include a consumption demand, a frequency regulation demand, and a power forecast compensation demand;

[0066] The energy control execution unit includes:

[0067] a first balance recovery control unit, configured to set the output power of the alkaline electrolyzer to its maximum operating power when the power of the battery energy storage system is greater than a first preset power, the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is greater than the maximum operating power of the alkaline electrolyzer;

[0068] A second balance recovery control unit, configured to set the output power of the alkaline electrolyzer to 0 when the power of the battery energy storage system is greater than a first preset power, the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is less than the minimum operating power of the alkaline electrolyzer;

[0069] A third balance recovery control unit is used to set the output power of the alkaline electrolyzer to the power required for the power prediction compensation when the power of the battery energy storage system is greater than the first preset power, the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is between the minimum operating power of the alkaline electrolyzer and the maximum operating power of the alkaline electrolyzer;

[0070] The fourth control unit for balance recovery is used to set the output power of the alkaline electrolyzer to 0 when the power of the battery energy storage system is greater than the first preset power and the alkaline electrolyzer has not been started in the previous period.

[0071] Optionally, the flexible interconnected distribution network further includes a new energy converter, and the new energy converter is connected to the new energy unit.

[0072] By means of the above technical scheme, the flexible interconnected distribution network of the present application obtains the real-time output information of the new energy units through the smart meter, and collects the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system, and determines the energy regulation demand of the flexible interconnected distribution network based on the real-time output information and the real-time status, and generates energy regulation instructions for the energy regulation demand through the comprehensive energy management system, and sends the energy regulation instructions for the energy regulation demand to the energy storage inverter, and performs energy regulation based on the energy regulation instructions through the electric-hydrogen hybrid energy storage system. It can be seen that the electric-hydrogen hybrid energy storage system in the flexible interconnected distribution network mixes the hydrogen energy storage system and the battery energy storage system, so that the flexible interconnected distribution network can meet different energy regulation needs. The battery energy storage system is mainly used in short-time scale scenarios, and the hydrogen energy storage system is mainly used in long-time scale scenarios, realizing the complementary advantages of the hydrogen energy storage system and the battery energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0074] Figure 1 An architecture diagram of a flexible interconnected distribution network provided in an embodiment of the present application;

[0075] Figure 2 A schematic diagram of a process for realizing energy regulation in a flexible interconnected distribution network provided in an embodiment of the present application;

[0076] Figure 3 An architecture diagram of another flexible interconnected distribution network provided in an embodiment of the present application;

[0077] Figure 4 A schematic diagram of a process for energy regulation based on frequency modulation requirements provided in an embodiment of the present application;

[0078] Figure 5 A schematic diagram of a process for energy regulation based on consumption demand provided in an embodiment of the present application;

[0079] Figure 6 A schematic diagram of a process for energy regulation based on charge balance recovery requirements provided in an embodiment of the present application;

[0080] Figure 7 A schematic diagram of a process for energy regulation based on power prediction and compensation requirements provided in an embodiment of the present application;

[0081] Figure 8 A schematic diagram of the operating effect of the electric-hydrogen hybrid energy storage system provided in an embodiment of the present application;

[0082] Fig. 9 A schematic diagram of the device structure for realizing energy regulation in a flexible interconnected distribution network provided in an embodiment of the present application. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0084] Figure 1 An optional architecture of a flexible interconnected distribution network provided in an embodiment of the present application, such as Figure 1 As shown, the architecture may include:

[0085] Electric-hydrogen hybrid energy storage system, integrated energy management system, energy storage information collection system, smart electricity meter, energy storage inverter and new energy units.

[0086] Among them, the electric-hydrogen hybrid energy storage system can be electrically connected to the energy storage inverter, the energy storage information acquisition system can be communicatively connected to the electric-hydrogen hybrid energy storage system and the integrated energy management system, the smart meter can be communicatively connected to the energy storage inverter and the new energy unit, and the integrated energy management system can be communicatively connected to the smart meter.

[0087] based on Figure 1 The architecture, Figure 2 A process of the energy control method implemented by the flexible interconnected distribution network provided in the embodiment of the present application is shown, referring to Figure 2 , the process may include:

[0088] Step S110: obtaining the real-time output information of the new energy unit through the smart meter, and collecting the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information collection system.

[0089] Among them, the electric-hydrogen hybrid energy storage system can include a battery energy storage system and a hydrogen energy storage system.

[0090] Specifically, the real-time output information of the new energy unit may include the real-time output power of the new energy unit. The real-time status of the electric-hydrogen hybrid energy storage system may indicate the start and stop status of the battery energy storage system and its output power when it is turned on, as well as the start and stop status of the hydrogen energy storage system and its output power when it is turned on.

[0091] Step S120: Determine the energy regulation demand of the flexible interconnected distribution network based on the real-time output information and real-time status.

[0092] Specifically, the energy regulation of the flexible interconnected distribution network can be adjusted every preset time, such as every 15 minutes. Therefore, the energy regulation demand of the flexible interconnected distribution network for the next regulation can be determined based on the current real-time output information and real-time status.

[0093] Among them, the energy regulation demand of the flexible interconnected distribution network may include one or more of frequency regulation demand, consumption demand, power forecasting compensation demand and charge balance recovery demand. The charge balance recovery demand may indicate the demand for providing self-recovering charge imbalance. Different regulation demands have different response priorities, such as the response priority of frequency regulation demand is greater than consumption demand, which is then greater than power forecasting compensation demand, which is then greater than charge balance recovery demand.

[0094] Step S130: Generate energy control instructions for energy control needs through the integrated energy management system.

[0095] Specifically, the energy storage inverter can generate energy control instructions required to control the electric-hydrogen hybrid energy storage system to perform energy control according to specific energy control requirements.

[0096] Step S140: Send an energy control instruction of the energy control demand to the energy storage converter, and perform energy control based on the energy control instruction through the electric-hydrogen hybrid energy storage system.

[0097] Specifically, the electric-hydrogen hybrid energy storage system can adjust the output of the battery energy storage system and the output of the hydrogen energy storage system respectively, so that the output status meets the energy regulation needs of the flexible interconnected distribution network.

[0098] The energy control method of the flexible interconnected distribution network provided in this embodiment obtains the real-time output information of the new energy unit through the smart meter, and collects the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system, determines the energy control demand of the flexible interconnected distribution network based on the real-time output information and the real-time status, generates energy control instructions for the energy control demand through the comprehensive energy management system, issues the energy control instructions for the energy control demand to the energy storage inverter, and performs energy control based on the energy control instructions through the electric-hydrogen hybrid energy storage system. It can be seen that the electric-hydrogen hybrid energy storage system in the flexible interconnected distribution network mixes the hydrogen energy storage system and the battery energy storage system, so that the flexible interconnected distribution network has different energy control needs. The battery energy storage system is mainly used in short-time scale scenarios, and the hydrogen energy storage system is mainly used in long-time scale scenarios, realizing the complementary advantages of the hydrogen energy storage system and the battery energy storage system.

[0099] based on Figure 1 The architecture shown, Figure 3 Another architecture of the flexible interconnected distribution network provided in the embodiment of the present application is shown. Figure 3 , the architecture may include:

[0100] Hydrogen energy storage system, battery energy storage system, integrated energy management system, energy storage information collection system, new energy units, new energy converters, several energy storage converters, smart meters, and new energy converters.

[0101] Among them, the hydrogen energy storage system and the battery energy storage system constitute an electric-hydrogen hybrid energy storage system. The hydrogen energy storage system may include an alkaline electrolyzer, a fuel cell, a hydrogen storage tank, and a hydrogen load. The electrolyzer may be electrically connected to the fuel cell through the hydrogen storage tank, the hydrogen load may be electrically connected to the hydrogen storage tank, and the alkaline electrolyzer and the fuel cell may be electrically connected to an energy storage inverter respectively. The battery energy storage system may include two batteries, and the two batteries may be electrically connected to an energy storage inverter respectively. The new energy unit may be electrically connected to the new energy inverter. Figure 3 The four energy storage converters and the new energy converter can all be electrically connected to the feeder.

[0102] Specifically, the hydrogen energy storage system and the battery energy storage system can coordinate their output with each other. The hydrogen energy storage system can convert electrical energy into hydrogen energy and store it in a hydrogen storage tank through charging of an alkaline electrolyzer, and convert hydrogen energy into electrical energy through discharging of a fuel cell. The alkaline electrolyzer has a maximum operating power and a minimum operating power, which are 125% of the rated power of the alkaline electrolyzer and 25% of the rated power of the alkaline electrolyzer, respectively.

[0103] Based on this, the process of obtaining the real-time output information of the new energy unit through the integrated energy management system mentioned in the above embodiment is introduced, and the process may include:

[0104] The real-time output information obtained by the smart meter collected by the new energy unit is obtained through the comprehensive energy management system.

[0105] In some embodiments of the present application, when the energy regulation demand includes a frequency regulation demand, the process of performing energy regulation based on the energy regulation instruction by the electric-hydrogen hybrid energy storage system mentioned in the above embodiment is introduced, such as Figure 4 As shown, the process may include:

[0106] Step S210: When the frequency of the flexible interconnected distribution network fluctuates positively and the power required for frequency modulation is greater than the output power of the alkaline electrolyzer in the previous period, the output power of the alkaline electrolyzer is maintained, and the output power of the battery energy storage system is adjusted to the difference between the power required for frequency modulation and the output power of the alkaline electrolyzer.

[0107] It is understandable that the energy regulation of the flexible interconnected distribution network can be regulated every preset time, such as every 15 minutes, so the duration of each period is 15 minutes. When the frequency of the flexible interconnected distribution network fluctuates positively and the power required for frequency regulation is greater than the output power of the alkaline electrolyzer in the previous period, the alkaline electrolyzer maintains the power output unchanged, and the battery energy storage system plays an auxiliary role, so the remaining required power is provided by the battery energy storage system.

[0108] Step S220: When the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency modulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency modulation is greater than the minimum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to the charging power required for frequency modulation.

[0109] It can be understood that when the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency regulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency regulation is greater than the minimum operating power of the alkaline electrolyzer, the alkaline electrolyzer plays a major role in providing the charging power required for frequency regulation.

[0110] Step S230: When the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency regulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency regulation is not greater than the minimum operating power of the alkaline electrolyzer, the battery energy storage system is driven to discharge so that the alkaline electrolyzer operates at its minimum operating power.

[0111] It can be understood that when the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency regulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency regulation is not greater than the minimum operating power of the alkaline electrolyzer, the battery energy storage system plays a replenishment role and can reverse discharge to maintain the minimum power operation of the alkaline electrolyzer.

[0112] Step S240: When the frequency of the flexible interconnected distribution network fluctuates in the opposite direction, the battery energy storage system is driven to discharge so that the alkaline electrolyzer operates at its minimum operating power.

[0113] It can be understood that when the frequency of the flexible interconnected distribution network fluctuates in the reverse direction, the battery energy storage system discharges in the reverse direction to maintain the minimum power operation of the alkaline electrolyzer and at the same time suppresses the reverse fluctuation of the frequency of the flexible interconnected distribution network.

[0114] In the energy regulation method of the flexible interconnected distribution network provided in this embodiment, the hydrogen energy storage system and the battery energy storage system respond to the frequency regulation demand of the flexible interconnected distribution network, and determine the output action to be performed according to the fluctuation direction of the frequency of the flexible interconnected distribution network, the output power of the alkaline electrolyzer in the previous period, and the power size of the frequency regulation demand, and realize energy regulation through the complementary advantages of the hydrogen energy storage system and the battery energy storage system.

[0115] In some embodiments of the present application, when the energy regulation demand includes consumption demand but does not include frequency regulation demand, the process of performing energy regulation based on energy regulation instructions by the electric-hydrogen hybrid energy storage system mentioned in the above embodiment is introduced, such as Figure 5 As shown, the process may include:

[0116] Step S310: When the power required for consumption is less than the minimum operating power of the alkaline electrolyzer, and the alkaline electrolyzer has been started in the previous period, the output power of the alkaline electrolyzer is set to the minimum operating power of the alkaline electrolyzer, and the battery energy storage system is driven to discharge.

[0117] It can be understood that when the power required for absorption is less than the minimum operating power of the alkaline electrolyzer, and the alkaline electrolyzer has been started in the previous period, the alkaline electrolyzer can maintain the minimum operating power operation, and the battery energy storage system can play an auxiliary role and can discharge to assist the operation of the alkaline electrolyzer.

[0118] Step S320: When the power required for consumption is less than the minimum operating power of the alkaline electrolyzer, and the alkaline electrolyzer has not been started in the previous period, the output power of the battery energy storage system is set to the power required for consumption, and the output power of the hydrogen energy storage system is set to 0.

[0119] It is understandable that when the power required for consumption is less than the minimum operating power of the alkaline electrolyzer, and the alkaline electrolyzer was not started in the previous period, the battery energy storage system can provide the power required for consumption, and the hydrogen energy storage system will not operate.

[0120] Step S330: When the power required for consumption is not less than the maximum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to its maximum operating power, and the output power of the battery energy storage system is set to the difference between the power required for consumption and the maximum operating power of the alkaline electrolyzer.

[0121] It can be understood that when the power required for consumption is not less than the maximum operating power of the alkaline electrolyzer, the alkaline electrolyzer can play a major output role and provide consumption demand with the maximum operating power, and the battery energy storage system can play an auxiliary output role and provide the remaining power required for consumption.

[0122] The energy regulation method of the flexible interconnected distribution network provided in this embodiment, the hydrogen energy storage system and the battery energy storage system respond to the consumption demand of the flexible interconnected distribution network, and determine the output action to be performed according to the power size of the consumption demand and the startup state of the alkaline electrolyzer in the previous time period, and realize energy regulation through the complementary advantages of the hydrogen energy storage system and the battery energy storage system.

[0123] In some embodiments of the present application, when the energy regulation demand includes power prediction compensation demand but does not include consumption demand and frequency regulation demand, the process of energy regulation based on energy regulation instructions by the electric-hydrogen hybrid energy storage system mentioned in the above embodiment is introduced, such as Figure 6 As shown, the process may include:

[0124] Step S410: When the power required for power prediction compensation is not less than the rated power of the battery energy storage system, the output power of the battery energy storage system is set to its rated power, and the output power of the hydrogen energy storage system is set to the difference between the power required for power prediction compensation and the rated power of the battery energy storage system.

[0125] Specifically, the output power of the hydrogen energy storage system may include the output power of the alkaline electrolyzer and the output power of the fuel cell.

[0126] It can be understood that when the power forecast compensation demand is not less than the rated power of the battery energy storage system, the battery energy storage system can play a major role in output. The battery energy storage system is charged and discharged at the rated power, and the shortfall in power can be provided by the alkaline electrolyzer and the fuel cell.

[0127] Step S420: When the power required for power prediction compensation is less than the rated power of the battery energy storage system, the output power of the battery energy storage system is set to the power required for power prediction compensation, and the output power of the hydrogen energy storage system is set to 0.

[0128] It can be understood that when the power required for power forecast compensation is less than the rated power of the battery energy storage system, the battery energy storage system can play a major role in output, the battery energy storage system quickly responds to the power forecast compensation demand, and the hydrogen energy storage system does not operate.

[0129] In addition, when the new energy unit has a frequency regulation demand within the power forecast compensation range, it can be regulated according to the control method corresponding to the frequency regulation scenario.

[0130] The energy regulation method of the flexible interconnected distribution network provided in this embodiment, the hydrogen energy storage system and the battery energy storage system respond to the power prediction compensation demand of the flexible interconnected distribution network, and determine the output action to be performed according to the power size of the power prediction compensation demand, and realize energy regulation by complementing the advantages of the hydrogen energy storage system and the battery energy storage system.

[0131] In some embodiments of the present application, when the energy regulation demand does not include consumption demand, frequency regulation demand and power prediction compensation demand, the process of performing energy regulation based on energy regulation instructions by the electric-hydrogen hybrid energy storage system mentioned in the above embodiment is introduced, and the process may include:

[0132] S1. When the power of the battery energy storage system is greater than a first preset power, the hydrogen energy storage system is driven to charge.

[0133] Specifically, the first preset power level may represent a relatively high standard power level of the battery energy storage system, and the first preset power level may represent a custom value, such as 70% of the maximum power level of the battery energy storage system.

[0134] It is understandable that at a certain moment when the new energy unit does not need to perform frequency regulation, absorption and power forecast compensation, when the battery energy storage system is high in power, the hydrogen energy storage system can be charged.

[0135] S2. When the power of the battery energy storage system is less than a second preset power, the hydrogen energy storage system is driven to discharge.

[0136] Specifically, the first preset power may be no less than the second preset power. The second preset power may represent a lower standard power of the battery energy storage system. The second preset power may represent a custom value, such as 30% of the maximum power of the battery energy storage system.

[0137] It is understandable that at a certain moment when the new energy units do not need to perform frequency regulation, absorption and power forecast compensation, when the battery energy storage system is low in power, the hydrogen energy storage system can discharge to maintain the battery energy storage system at an intermediate level to ensure sufficient charging and discharging margin at the next moment.

[0138] In some embodiments of the present application, when the energy regulation demand includes the charge balance recovery demand but does not include the consumption demand, the frequency regulation demand and the power prediction compensation demand, the process of energy regulation based on the energy regulation instruction by the electric-hydrogen hybrid energy storage system mentioned in the above embodiment is introduced, such as Figure 7 As shown, the process may include:

[0139] Step S510: When the power of the battery energy storage system is greater than the first preset power, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is greater than the maximum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to its maximum operating power.

[0140] Specifically, the first preset power level may represent a relatively high standard power level of the battery energy storage system, and the first preset power level may represent a custom value, such as 70% of the maximum power level of the battery energy storage system.

[0141] It can be understood that when the battery energy storage system's power is high, and the alkaline electrolyzer has been started in the previous period, and the power required to restore the charge balance is greater than the maximum operating power of the alkaline electrolyzer, the alkaline electrolyzer plays a major output role and operates at the maximum operating power. At this time, the charging and discharging power of the battery energy storage system and the hydrogen energy storage system are equal, and the charging and discharging states are opposite.

[0142] Step S520: When the power of the battery energy storage system is greater than the first preset power, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is less than the minimum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to 0.

[0143] It is understandable that when the battery energy storage system has a high power level, the alkaline electrolyzer has been started in the previous period, and the power required to restore the charge balance is less than the maximum operating power of the alkaline electrolyzer, the alkaline electrolyzer does not operate.

[0144] Step S530: When the power of the battery energy storage system is greater than the first preset power, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is between the minimum operating power of the alkaline electrolyzer and the maximum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to the power required for power prediction compensation.

[0145] It can be understood that when the power of the battery energy storage system is high, and the alkaline electrolyzer has been started in the previous period, and the power required for charge balance restoration is between the minimum operating power of the alkaline electrolyzer and the maximum operating power of the alkaline electrolyzer, the alkaline electrolyzer can play a major role and provide the power required for charge balance restoration. At this time, the discharge power of the battery energy storage system is equal to the power required for charge balance restoration.

[0146] Step S540: When the power of the battery energy storage system is greater than the first preset power and the alkaline electrolytic cell has not been started in the previous period, the output power of the alkaline electrolytic cell is set to 0.

[0147] It is understandable that when the battery energy storage system has a high charge and the alkaline electrolyzer has not been started in the previous period, the alkaline electrolyzer does not operate.

[0148] In the energy regulation method of the flexible interconnected distribution network provided in this embodiment, the hydrogen energy storage system and the battery energy storage system respond to the charge balance recovery demand of the flexible interconnected distribution network, and determine the output action to be performed according to the power size of the charge balance recovery demand, the startup state of the alkaline electrolyzer in the previous period, and the power size of the battery energy storage system, and realize energy regulation through the complementary advantages of the hydrogen energy storage system and the battery energy storage system.

[0149] In some embodiments of the present application, a specific application example of a flexible interconnected distribution network applied to the above embodiments is provided.

[0150] In this application example, a single battery energy storage system and an electric-hydrogen hybrid energy storage system of a certain capacity are selected for comparison. The capacity configuration results are shown in the following table.

[0151]

[0152]

[0153] It can be seen that under the condition of similar costs, the primary frequency regulation evaluation index of the electric-hydrogen hybrid energy storage system is lower than that of the single battery energy storage system, indicating that the frequency fluctuation of the flexible interconnected distribution network is smaller and the frequency regulation effect is better. At the same time, the electric-hydrogen hybrid energy storage system has higher day-ahead prediction accuracy and significantly lower power abandonment rate, which is more prominent in solving the problem of new energy consumption. It can realize the complementary advantages of different energy storage technologies, make up for the defects of single energy storage, and meet the multiple needs of the flexible interconnected distribution network for new energy grid connection.

[0154] Furthermore, the operation simulation of the hydrogen energy storage system in the electric-hydrogen hybrid energy storage system is carried out, and the effect diagram is as follows: Figure 8 As shown in the figure, it can be seen that the output of the hydrogen energy storage system can be assisted by the battery energy storage system, which can make the alkaline electrolyzer operate between the maximum and minimum operating power, thereby improving the safety of the hydrogen energy storage system. At the same time, the output of the alkaline electrolyzer is above 15 minutes, which can avoid frequent startup of the alkaline electrolyzer.

[0155] The following describes an apparatus for implementing energy regulation of a flexible interconnected distribution network provided in an embodiment of the present application. The apparatus for implementing energy regulation of a flexible interconnected distribution network described below and the method for implementing energy regulation of a flexible interconnected distribution network described above can refer to each other.

[0156] See also Fig. 9 , Fig. 9 A schematic diagram of the structure of a device for realizing energy regulation of a flexible interconnected power distribution network disclosed in an embodiment of the present application.

[0157] like Fig. 9 As shown, the device may include:

[0158] A real-time information acquisition unit 11 is used to acquire the real-time output information of the new energy unit through the smart meter, and to acquire the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system;

[0159] A regulation demand determining unit 12, configured to determine the energy regulation demand of the flexible interconnected distribution network based on the real-time output information and the real-time status;

[0160] A control instruction generating unit 13, used to generate an energy control instruction of the energy control demand through an integrated energy management system;

[0161] The energy control execution unit 14 is used to send the energy control instruction of the energy control demand to the energy storage converter, and perform energy control based on the energy control instruction through the electric-hydrogen hybrid energy storage system.

[0162] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a frequency regulation demand;

[0163] The energy control execution unit includes:

[0164] The first frequency modulation demand control unit is used to maintain the output power of the alkaline electrolyzer when the frequency of the flexible interconnected distribution network fluctuates positively and the power of the frequency modulation demand is greater than the output power of the alkaline electrolyzer in the previous period, and adjust the output power of the battery energy storage system to the difference between the power of the frequency modulation demand and the output power of the alkaline electrolyzer;

[0165] The second frequency modulation demand control unit is used to set the output power of the alkaline electrolyzer to the charging power of the frequency modulation demand when the frequency of the flexible interconnected distribution network fluctuates positively and the power of the frequency modulation demand is not greater than the output power of the alkaline electrolyzer in the previous period and the power of the frequency modulation demand is greater than the minimum operating power of the alkaline electrolyzer;

[0166] The third frequency regulation unit is used to drive the battery energy storage system to discharge when the frequency of the flexible interconnected distribution network fluctuates positively, and the power of the frequency regulation demand is not greater than the output power of the alkaline electrolyzer in the previous period, and the power of the frequency regulation demand is not greater than the minimum operating power of the alkaline electrolyzer, so that the alkaline electrolyzer operates at its minimum operating power;

[0167] The fourth control unit for frequency regulation demand is used to drive the battery energy storage system to discharge when the frequency of the flexible interconnected distribution network fluctuates in the opposite direction, so that the alkaline electrolyzer operates at its minimum operating power.

[0168] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a consumption demand, but does not include a frequency regulation demand;

[0169] The energy control execution unit includes:

[0170] a first control unit for accommodating demand, configured to set the output power of the alkaline electrolyzer to the minimum operating power of the alkaline electrolyzer and drive the battery energy storage system to discharge when the power of the accommodating demand is less than the minimum operating power of the alkaline electrolyzer and the alkaline electrolyzer has been started in the previous period;

[0171] The second regulation unit for accommodating demand is used to set the output power of the battery energy storage system to the power of the consumption demand and to set the output power of the hydrogen energy storage system to 0 when the power of the consumption demand is less than the minimum operating power of the alkaline electrolyzer and the alkaline electrolyzer has not been started in the previous period;

[0172] The third regulation unit for accommodating demand is used to set the output power of the alkaline electrolyzer to its maximum operating power when the power of the accommodating demand is not less than the maximum operating power of the alkaline electrolyzer, and to set the output power of the battery energy storage system to the difference between the power of the accommodating demand and the maximum operating power of the alkaline electrolyzer.

[0173] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer and a fuel cell, and the energy regulation demand includes a power prediction compensation demand, and does not include a consumption demand and a frequency regulation demand;

[0174] The energy control execution unit includes:

[0175] a first compensation demand control unit, configured to set the output power of the battery energy storage system to its rated power when the power of the power prediction compensation demand is not less than the rated power of the battery energy storage system, and to set the output power of the hydrogen energy storage system to the difference between the power of the power prediction compensation demand and the rated power of the battery energy storage system, wherein the output power of the hydrogen energy storage system includes the output power of the alkaline electrolyzer and the output power of the fuel cell;

[0176] The second compensation demand control unit is used to set the output power of the battery energy storage system to the power of the power prediction compensation demand and set the output power of the hydrogen energy storage system to 0 when the power of the power prediction compensation demand is less than the rated power of the battery energy storage system.

[0177] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, and the energy regulation demand does not include consumption demand, frequency regulation demand and power prediction compensation demand;

[0178] The energy control execution unit includes:

[0179] A charging control unit, configured to drive the hydrogen energy storage system to charge when the power of the battery energy storage system is greater than a first preset power;

[0180] A discharge control unit is used to drive the hydrogen energy storage system to discharge when the power of the battery energy storage system is less than a second preset power, and the first preset power is not less than the second preset power.

[0181] Optionally, the electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a charge balance recovery demand, and does not include a consumption demand, a frequency regulation demand, and a power forecast compensation demand;

[0182] The energy control execution unit includes:

[0183] a first balance recovery control unit, configured to set the output power of the alkaline electrolyzer to its maximum operating power when the power of the battery energy storage system is greater than a first preset power, the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is greater than the maximum operating power of the alkaline electrolyzer;

[0184] A second balance recovery control unit, configured to set the output power of the alkaline electrolyzer to 0 when the power of the battery energy storage system is greater than a first preset power, the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is less than the minimum operating power of the alkaline electrolyzer;

[0185] A third balance recovery control unit is used to set the output power of the alkaline electrolyzer to the power required for the power prediction compensation when the power of the battery energy storage system is greater than the first preset power, the alkaline electrolyzer has been started in the previous period, and the power required for charge balance recovery is between the minimum operating power of the alkaline electrolyzer and the maximum operating power of the alkaline electrolyzer;

[0186] The fourth control unit for balance recovery is used to set the output power of the alkaline electrolyzer to 0 when the power of the battery energy storage system is greater than the first preset power and the alkaline electrolyzer has not been started in the previous period.

[0187] Optionally, the flexible interconnected distribution network further includes a new energy converter, and the new energy converter is connected to the new energy unit.

[0188] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0189] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0190] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for energy control of a flexible interconnected distribution network, characterized in that: Applied to a flexible interconnected distribution network, the flexible interconnected distribution network includes an electric-hydrogen hybrid energy storage system, an integrated energy management system, an energy storage information collection system, a smart meter, an energy storage converter and a new energy unit; The method includes: Acquire the real-time output information of the new energy unit through the smart meter, and acquire the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system; Determining energy regulation requirements of the flexible interconnected distribution network based on the real-time output information and the real-time status; Generate energy control instructions for the energy control requirements through an integrated energy management system; Sending an energy control instruction of the energy control demand to the energy storage converter, and performing energy control based on the energy control instruction through the electric-hydrogen hybrid energy storage system; The electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a frequency regulation demand; Energy regulation is performed by the electric-hydrogen hybrid energy storage system based on the energy regulation instruction, including: When the frequency of the flexible interconnected distribution network fluctuates positively and the power required for frequency modulation is greater than the output power of the alkaline electrolyzer in the previous period, the output power of the alkaline electrolyzer is maintained, and the output power of the battery energy storage system is adjusted to the difference between the power required for frequency modulation and the output power of the alkaline electrolyzer; When the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency modulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency modulation is greater than the minimum operating power of the alkaline electrolyzer, the output power of the alkaline electrolyzer is set to the charging power required for frequency modulation; When the frequency of the flexible interconnected distribution network fluctuates positively, and the power required for frequency modulation is not greater than the output power of the alkaline electrolyzer in the previous period, and the power required for frequency modulation is not greater than the minimum operating power of the alkaline electrolyzer, driving the battery energy storage system to discharge so that the alkaline electrolyzer operates at its minimum operating power; When the frequency of the flexible interconnected power distribution network fluctuates in the opposite direction, the battery energy storage system is driven to discharge so that the alkaline electrolyzer operates at its minimum operating power.

2. The method according to claim 1, characterized in that The hydrogen energy storage system also includes a hydrogen storage tank and a hydrogen load.

3. The method according to claim 1, characterized in that The flexible interconnected distribution network also includes a new energy converter, which is connected to the new energy generator set.

4. An energy control device for a flexible interconnected distribution network, characterized in that: Applied to a flexible interconnected distribution network, the flexible interconnected distribution network includes an electric-hydrogen hybrid energy storage system, an integrated energy management system, an energy storage information collection system, a smart meter, an energy storage converter and a new energy unit; The device includes: A real-time information acquisition unit, used to acquire the real-time output information of the new energy unit through the smart meter, and to acquire the real-time status of the electric-hydrogen hybrid energy storage system through the energy storage information acquisition system; A regulation demand determining unit, configured to determine an energy regulation demand of the flexible interconnected distribution network based on the real-time output information and the real-time status; A control instruction generating unit, used for generating an energy control instruction for the energy control demand through an integrated energy management system; An energy control execution unit, used for issuing an energy control instruction of the energy control demand to the energy storage converter, and performing energy control based on the energy control instruction through the electric-hydrogen hybrid energy storage system; The electric-hydrogen hybrid energy storage system includes a hydrogen energy storage system and a battery energy storage system, the hydrogen energy storage system includes an alkaline electrolyzer, and the energy regulation demand includes a frequency regulation demand; The energy control execution unit includes: The first frequency modulation demand control unit is used to maintain the output power of the alkaline electrolyzer when the frequency of the flexible interconnected distribution network fluctuates positively and the power of the frequency modulation demand is greater than the output power of the alkaline electrolyzer in the previous period, and adjust the output power of the battery energy storage system to the difference between the power of the frequency modulation demand and the output power of the alkaline electrolyzer; The second frequency modulation demand control unit is used to set the output power of the alkaline electrolyzer to the charging power of the frequency modulation demand when the frequency of the flexible interconnected distribution network fluctuates positively and the power of the frequency modulation demand is not greater than the output power of the alkaline electrolyzer in the previous period and the power of the frequency modulation demand is greater than the minimum operating power of the alkaline electrolyzer; The third frequency regulation unit is used to drive the battery energy storage system to discharge when the frequency of the flexible interconnected distribution network fluctuates positively, and the power of the frequency regulation demand is not greater than the output power of the alkaline electrolyzer in the previous period, and the power of the frequency regulation demand is not greater than the minimum operating power of the alkaline electrolyzer, so that the alkaline electrolyzer operates at its minimum operating power; The fourth control unit for frequency regulation demand is used to drive the battery energy storage system to discharge when the frequency of the flexible interconnected distribution network fluctuates in the opposite direction, so that the alkaline electrolyzer operates at its minimum operating power.

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