Multi-module hybrid micro-grid energy storage shelter energy management control system and method

Abstract

The invention relates to a multi-module hybrid micro-grid energy storage shelter energy management control system. The multi-module hybrid micro-grid energy storage shelter energy management control system comprises a micro-grid energy storage shelter energy management control system EMS, an energy storage module, a fire fighting system, a photovoltaic power generation system, an alternating current input and output acquisition module, a system circuit breaker and contactor on-off acquisition module, an internal direct current relay and an indicating lamp, an energy storage square cabin control panel knob and a remote control terminal. According to the invention, through presetting the off-grid standby control method, the off-grid power supply control method, the grid-connected standby control method, the grid-connected power supply control method, the charging power adjustment algorithm of each energy storage module and the like, stable and reliable operation of the multi-module hybrid micro-grid energy storage shelter system is realized; according to the invention, the energy consumption demand of a remote area with power shortage is met, diversified and flexible energy supply energy consumption demand schemes are provided, the energy supply in emergency is improved, and the energy safety and reliability are enhanced.

Description

Technical Field

[0001] The present disclosure relates to the field of energy and electricity, and in particular to an energy management and control system for a multi-module hybrid microgrid energy storage cabin. Background Art

[0002] Microgrids are mainly composed of distributed power sources, power loads, energy storage devices, control and protection systems, etc. Microgrids have flexible operating characteristics and can be connected to the grid or operated off the grid. They can make full use of renewable resources to alleviate power shortages and ensure power demand in areas where traditional power deployment is insufficient, as well as to achieve power popularization in areas without electricity. Microgrids improve the power supply reliability of distributed power generation systems, realize the integrated operation of distributed power sources and loads, reduce the pollution emissions of the system, effectively improve power supply reliability and energy utilization efficiency, adapt to the volatility of renewable energy, and meet the personalized power needs of specific users. It has become an important part of smart grid construction.

[0003] Microgrids can reduce dependence on centralized large power grids to a certain extent, especially in natural disasters or other emergency situations. Even if there are problems with the large power grid, microgrids can maintain power supply in local areas, enhancing the safety and reliability of energy supply. Microgrids are particularly suitable for integrating distributed renewable energy, such as solar energy and wind energy. Since these energy outputs are intermittent and uncertain, microgrids can more effectively manage the output of renewable energy and improve its utilization rate through intelligent control technology and energy storage systems. Microgrids are an effective means to implement green energy strategies and achieve carbon neutrality goals. They encourage and promote the widespread use of renewable energy, reduce fossil energy consumption, reduce carbon emissions, and support sustainable development goals. For remote areas and areas without electricity, microgrids, as a flexible and modular power supply solution, can provide stable power supply according to local conditions and help the process of rural electrification. Microgrid energy management technology is one of the core technologies of microgrid technology. The establishment of an effective microgrid energy management system is the basis for ensuring the normal operation of microgrids.

[0004] In the prior art, an intelligent mobile microgrid control system and method includes a diesel-generator cabin, a photovoltaic cabin, and an energy storage cabin, which are used as a basic microgrid control unit, and multiple sets can also be used in parallel; the microgrid system uses a DC bus and an AC bus for power transmission, and uses a CAN bus for communication. The control method of the present application: the control system has a master-slave controller competition strategy, and each controller competes for the host when the system has no host according to its own weight, ensuring that the integrity of the control system can be maintained when a single node is damaged. An economic mode is set to optimize the distribution of the output power of photovoltaics, energy storage and diesel generators, and improve the economy of the system power supply; a silent mode is set for noise and infrared radiation requirements in specific environments; a strong mode is set for high-power uninterrupted output in specific environments. The flexibility of the microgrid system is greatly improved, and it can adapt to different usage scenarios. A new energy microgrid power supply vehicle relates to the technical field of power supply vehicles, including a chassis, a cabin and a general system, the general system including a power supply system, a control protection system and a terminal, the power supply system including a wind power generation system, a photovoltaic power generation system, a diesel engine power generation system, a lithium battery energy storage system and an energy management system, the wind power generation system including a plurality of wind turbines, a fan control cabinet and a fan unloading cabinet, the photovoltaic power generation system including a photovoltaic module, the diesel engine power generation system including a diesel generator set, the energy storage lithium battery system including a battery, the control protection system including an inverter, and the terminal including a load; the power supply vehicle performs power conversion through an inverter to realize AC output under multiple input modes such as wind energy, solar energy, energy storage battery, and diesel generator set, so as to meet the user's uninterrupted power demand, and the diesel generator set provides power for the load and the battery group, so as to ensure stable power supply even when there is no wind or light for many consecutive days.

[0005] The above prior art does not involve a hybrid microgrid cabin energy storage control system and method with flexible composition of multiple energy storage modules, mixed multi-energy (photovoltaic, mains electricity, diesel generator set) input form, and graded output of three-phase AC.

[0006] Therefore, one or more methods are needed to solve the above problems.

[0007] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0008] The purpose of the present disclosure is to provide a multi-module hybrid microgrid energy storage cabin energy management and control system, thereby overcoming one or more problems caused by the limitations and defects of related technologies at least to a certain extent.

[0009] According to one aspect of the present disclosure, a multi-module hybrid microgrid energy storage cabin energy management and control system is provided, including a microgrid energy storage cabin energy management and control system EMS, an energy storage module, a fire protection system, a photovoltaic power generation system, an AC input and output acquisition module, a system circuit breaker and contactor on / off acquisition module, an internal DC relay and indicator light, an energy storage cabin control panel knob, and a remote control terminal, wherein:

[0010] The energy management and control system EMS of the microgrid energy storage cabin is connected to the 12 three-phase energy storage modules inside the energy storage cabin through a 3-way CAN communication method to control the operation of the energy storage modules in the cabin; the energy management and control system EMS of the microgrid energy storage cabin is connected to the fire protection system inside the energy storage cabin through a 1-way CAN communication method to receive real-time monitoring data of the fire protection system;

[0011] The EMS is connected to the photovoltaic power generation system via RS485 communication to control and adjust the operation of the photovoltaic power generation system in real time;

[0012] The EMS is connected to the AC input and output acquisition module via RS485 communication to obtain energy data of the AC input port and the AC output port;

[0013] The EMS is connected to the system circuit breaker and contactor on-off acquisition module via RS485 communication to obtain on-off data of the energy storage cabin's strong power system;

[0014] The DO output of the EMS controls the on / off of the internal DC relay and indicator light, and the DI input of the EMS monitors the status of the knob on the energy storage cabin control panel;

[0015] The EMS is connected to the remote control terminal via TCP communication.

[0016] In an exemplary embodiment of the present disclosure, the energy storage modules in the energy storage cabin of the system further include an A-phase energy storage cabin, a B-phase energy storage cabin, and a C-phase energy storage cabin, and each phase energy storage cabin includes 4 energy storage modules;

[0017] Each phase energy storage cabin includes 4 energy storage modules, including 1 host energy storage module, 2 slave energy storage modules, and 1 current source energy storage module.

[0018] In an exemplary embodiment of the present disclosure, the system further includes:

[0019] The system is manually started based on the power switch of the energy storage cabin control panel. When the power switch is closed, the EMS is powered on and the control system interface displays the current system operation data;

[0020] After the system is started, the EMS monitors the control panel knobs and external inputs in real time, and starts the energy storage module when preset conditions are met.

[0021] In an exemplary embodiment of the present disclosure, when the system is operating in an off-grid standby state:

[0022] The host energy storage module and the slave energy storage module of the energy storage module operate in an independent inverter state, and the current source energy storage module operates in a grid-connected state;

[0023] The maximum power limit of the photovoltaic power generation system is calculated to limit the maximum power of photovoltaic power generation, and the photovoltaic charging control of the energy storage module in the system is carried out based on the calculation result and the actual photovoltaic power generation power.

[0024] In an exemplary embodiment of the present disclosure, when the system operates in an off-grid power supply state:

[0025] The host energy storage module and the slave energy storage module of the energy storage module operate in an independent inverter state, and the current source energy storage module operates in a grid-connected state;

[0026] According to the maximum allowable charging power of each energy storage module in real time, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of the photovoltaic power generation system;

[0027] Calculate the power and total number of the host energy storage module and slave energy storage module of the energy storage module, and provide off-grid power supply at a preset load level;

[0028] The total load power and the sum of the maximum allowable discharge powers of other non-current source modules in each phase are calculated separately, and the discharge power of the current source energy storage module of each phase is calculated and controlled based on the load power and the sum of the maximum allowable discharge powers of the non-current source energy storage modules. The off-grid power supply of the system is controlled based on the calculation results.

[0029] In an exemplary embodiment of the present disclosure, when the system is running in a grid-connected power supply state:

[0030] According to the maximum allowable charging power of each energy storage module in real time, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of the photovoltaic power generation system;

[0031] Carry out load classification management according to the number of online energy storage modules;

[0032] If the power of each phase load is smaller than the theoretical carrying power of each phase energy storage module, the energy storage module is charged by calculation;

[0033] The energy storage module is maintained and charged based on a preset energy storage module maintenance charging request signal.

[0034] In an exemplary embodiment of the present disclosure, when the system is running in a grid-connected standby state:

[0035] According to the real-time maximum allowable charging power of each energy storage module, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of photovoltaic power generation; and the charging power of each module is calculated to control the charging.

[0036] In an exemplary embodiment of the present disclosure, the system further includes:

[0037] Based on the preset charging power regulation algorithm of each module, the charging power of each phase current source energy storage module is regulated when photovoltaic access is made when the system is off-grid, and the charging power of each energy storage module is regulated when the system is connected to the grid.

[0038] In one aspect of the present disclosure, a method for energy management and control system of a multi-module hybrid microgrid energy storage cabin is provided, comprising:

[0039] Based on each module of the multi-module hybrid microgrid energy storage cabin energy management and control system, the multi-module hybrid microgrid energy storage cabin energy management and control system is put into system standby mode and multi-module energy storage module is started up;

[0040] Based on a preset off-grid standby control method, the multi-module hybrid microgrid energy storage cabin energy management and control system performs off-grid standby operation control;

[0041] Based on a preset off-grid power supply control method, the multi-module hybrid microgrid energy storage cabin energy management and control system performs off-grid power supply operation control;

[0042] Based on the preset grid-connected standby control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled for grid-connected standby operation;

[0043] Based on a preset grid-connected power supply control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled for grid-connected power supply operation;

[0044] Based on the preset charging power regulation algorithm for each energy storage module, the charging power of each phase current source energy storage module is regulated when the photovoltaic is connected when the system is off-grid and when the energy storage module is connected to the grid;

[0045] The energy management and control system of the multi-module hybrid microgrid energy storage cabin is subjected to system sleep, remote terminal remote control power supply / off, system shutdown, emergency stop, and fault protection control. The system sleep includes local sleep and remote terminal remote control sleep.

[0046] A multi-module hybrid microgrid energy storage cabin energy management and control system in an exemplary embodiment of the present disclosure includes a microgrid energy storage cabin energy management and control system EMS, energy storage modules, fire protection system, photovoltaic power generation system, AC input and output acquisition module, system circuit breaker and contactor on / off acquisition module, internal DC relay and indicator light, energy storage cabin control panel knob, and remote control terminal. The present disclosure achieves stable and reliable operation of the multi-module hybrid microgrid energy storage cabin system by presetting off-grid standby control method, off-grid power supply control method, grid-connected standby control method, grid-connected power supply control method, charging power adjustment algorithm of each energy storage module, etc., solves the energy demand of power shortage in remote areas and the energy demand of diversified and flexible energy supply, improves energy supply in emergency situations, and enhances energy security and reliability.

[0047] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0049] Figure 1 An overall block diagram of an energy management and control system of a multi-module hybrid microgrid energy storage cabin according to an exemplary embodiment of the present disclosure is shown;

[0050] Figure 2 A flow chart of a multi-module hybrid microgrid energy storage cabin energy management control method according to an exemplary embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0052] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, devices, steps, etc. may be adopted. In other cases, known structures, methods, devices, implementations, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0053] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or these functional entities or parts of functional entities may be implemented in one or more software hardened modules, or these functional entities may be implemented in different networks and / or processor devices and / or microcontroller devices.

[0054] In this example embodiment, a multi-module hybrid microgrid energy storage cabin energy management and control system is first provided; Figure 1 As shown in, the multi-module hybrid microgrid energy storage cabin energy management and control system includes a microgrid energy storage cabin energy management and control system EMS, energy storage modules, fire protection system, photovoltaic power generation system, AC input and output acquisition module, system circuit breaker and contactor on / off acquisition module, internal DC relay and indicator light, energy storage cabin control panel knob, remote control terminal, wherein:

[0055] The energy management and control system EMS of the microgrid energy storage cabin is connected to the 12 three-phase energy storage modules inside the energy storage cabin through a 3-way CAN communication method to control the operation of the energy storage modules in the cabin; the energy management and control system EMS of the microgrid energy storage cabin is connected to the fire protection system inside the energy storage cabin through a 1-way CAN communication method to receive real-time monitoring data of the fire protection system;

[0056] The EMS is connected to the photovoltaic power generation system via RS485 communication to control and adjust the operation of the photovoltaic power generation system in real time;

[0057] The EMS is connected to the AC input and output acquisition module via RS485 communication to obtain energy data of the AC input port and the AC output port;

[0058] The EMS is connected to the system circuit breaker and contactor on-off acquisition module via RS485 communication to obtain on-off data of the energy storage cabin's strong power system;

[0059] The DO output of the EMS controls the on / off of the internal DC relay and indicator light, and the DI input of the EMS monitors the status of the knob on the energy storage cabin control panel;

[0060] The EMS is connected to the remote control terminal via TCP communication.

[0061] A multi-module hybrid microgrid energy storage cabin energy management and control system in an exemplary embodiment of the present disclosure includes a microgrid energy storage cabin energy management and control system EMS, energy storage modules, fire protection system, photovoltaic power generation system, AC input and output acquisition module, system circuit breaker and contactor on / off acquisition module, internal DC relay and indicator light, energy storage cabin control panel knob, and remote control terminal. The present disclosure achieves stable and reliable operation of the multi-module hybrid microgrid energy storage cabin system by presetting off-grid standby control method, off-grid power supply control method, grid-connected standby control method, grid-connected power supply control method, charging power adjustment algorithm of each energy storage module, etc., solves the energy demand of power shortage in remote areas and the energy demand of diversified and flexible energy supply, improves energy supply in emergency situations, and enhances energy security and reliability.

[0062] Next, a multi-module hybrid microgrid energy storage cabin energy management and control system in this example embodiment will be further described.

[0063] Embodiment 1:

[0064] The multi-module hybrid microgrid energy storage cabin energy management and control system includes a microgrid energy storage cabin energy management and control system EMS, energy storage modules, fire protection system, photovoltaic power generation system, AC input and output acquisition module, system circuit breaker and contactor on / off acquisition module, internal DC relay and indicator light, energy storage cabin control panel knob, and remote control terminal, among which:

[0065] The energy management and control system EMS of the microgrid energy storage cabin is connected to the 12 three-phase energy storage modules inside the energy storage cabin through a 3-way CAN communication method to control the operation of the energy storage modules in the cabin; the energy management and control system EMS of the microgrid energy storage cabin is connected to the fire protection system inside the energy storage cabin through a 1-way CAN communication method to receive real-time monitoring data of the fire protection system;

[0066] The EMS is connected to the photovoltaic power generation system via RS485 communication to control and adjust the operation of the photovoltaic power generation system in real time;

[0067] The EMS is connected to the AC input and output acquisition module via RS485 communication to obtain energy data of the AC input port and the AC output port;

[0068] The EMS is connected to the system circuit breaker and contactor on-off acquisition module via RS485 communication to obtain on-off data of the energy storage cabin's strong power system;

[0069] The DO output of the EMS controls the on / off of the internal DC relay and indicator light, and the DI input of the EMS monitors the status of the knob on the energy storage cabin control panel;

[0070] The EMS is connected to the remote control terminal via TCP communication.

[0071] In the embodiment of this example, the energy storage modules in the energy storage cabin of the system further include an A-phase energy storage cabin, a B-phase energy storage cabin, and a C-phase energy storage cabin, and each phase energy storage cabin includes 4 energy storage modules;

[0072] Each phase energy storage cabin includes 4 energy storage modules, including 1 host energy storage module, 2 slave energy storage modules, and 1 current source energy storage module.

[0073] In the embodiment of this example, the system further comprises:

[0074] The system is manually started based on the power switch of the energy storage cabin control panel. When the power switch is closed, the EMS is powered on and the control system interface displays the current system operation data;

[0075] After the system is started, the EMS monitors the control panel knobs and external inputs in real time, and starts the energy storage module when preset conditions are met.

[0076] In the embodiment of this example, when the system is operating in an off-grid standby state:

[0077] The host energy storage module and the slave energy storage module of the energy storage module operate in an independent inverter state, and the current source energy storage module operates in a grid-connected state;

[0078] The maximum power limit of the photovoltaic power generation system is calculated to limit the maximum power of photovoltaic power generation, and the photovoltaic charging control of the energy storage module in the system is carried out based on the calculation result and the actual photovoltaic power generation power.

[0079] In the embodiment of this example, when the system is operating in an off-grid power supply state:

[0080] The host energy storage module and the slave energy storage module of the energy storage module operate in an independent inverter state, and the current source energy storage module operates in a grid-connected state;

[0081] According to the maximum allowable charging power of each energy storage module in real time, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of the photovoltaic power generation system;

[0082] Calculate the power and total number of the host energy storage module and slave energy storage module of the energy storage module, and provide off-grid power supply at a preset load level;

[0083] The total load power and the sum of the maximum allowable discharge powers of other non-current source modules in each phase are calculated separately, and the discharge power of the current source energy storage module of each phase is calculated and controlled based on the load power and the sum of the maximum allowable discharge powers of the non-current source energy storage modules. The off-grid power supply of the system is controlled based on the calculation results.

[0084] In the embodiment of this example, when the system is running in a grid-connected power supply state:

[0085] According to the maximum allowable charging power of each energy storage module in real time, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of the photovoltaic power generation system;

[0086] Carry out load classification management according to the number of online energy storage modules;

[0087] If the power of each phase load is smaller than the theoretical carrying power of each phase energy storage module, the energy storage module is charged by calculation;

[0088] The energy storage module is maintained and charged based on a preset energy storage module maintenance charging request signal.

[0089] In the embodiment of this example, when the system is running in the grid-connected standby state:

[0090] According to the real-time maximum allowable charging power of each energy storage module, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of photovoltaic power generation; and the charging power of each module is calculated to control the charging.

[0091] In the embodiment of this example, the system further comprises:

[0092] Based on the preset charging power regulation algorithm of each module, the charging power of each phase current source energy storage module is regulated when photovoltaic access is made when the system is off-grid, and the charging power of each energy storage module is regulated when the system is connected to the grid.

[0093] Embodiment 2:

[0094] In the embodiment of this example, the energy management control system EMS of the microgrid energy storage cabin in the control system is connected to the three-phase 12 energy storage modules inside the energy storage cabin (each phase includes 1 host, 2 slaves, and 1 current source, and the current source energy storage module is used for protection) and the fire protection system through a 4-way CAN communication method to control the operation of the energy storage modules in the cabin; the EMS is connected to the photovoltaic power generation system through RS485 communication to control and adjust the operation of the photovoltaic power generation system in real time; the EMS is connected to the AC input and output acquisition module through RS485 communication to obtain energy data of the AC input and AC output ports; the EMS is connected to the system circuit breaker and contactor on-off acquisition module through RS485 communication to obtain the on-off data of the energy storage cabin's strong power system; the DO output of the EMS controls the on-off of the internal DC relay and indicator light, and the DI input of the EMS monitors the changes in the knob of the energy storage cabin control panel; the EMS is connected to the remote control terminal through TCP communication. The present invention discloses energy management and control for a multi-module hybrid microgrid energy storage cabin system, and ensures the normal operation of the multi-module hybrid microgrid energy storage cabin system. It can adapt to cabin-level microgrid systems of different power levels, and has the advantages of easy adaptability, easy expansion, and high flexibility.

[0095] Aiming at the multi-module hybrid microgrid energy storage cabin system, a multi-module hybrid microgrid energy storage cabin energy management control system and method are proposed. Its main functions are as follows:

[0096] In the embodiment of this example, system standby includes:

[0097] The power switch (hereinafter referred to as "S1") knob is turned to "closed", S1 is closed, the 24V lead-acid battery in the system supplies power to the control circuit, the EMS and other equipment are powered on, and the power indicator light is on; the EMS runs a self-check, and after detecting that the S1 switch is closed, the power-on relay is closed to prevent the control power from being disconnected due to human error, and the control system interface displays the current system operation data;

[0098] In the embodiment of this example, starting the multi-module energy storage module includes:

[0099] When the system is in standby mode, the internal energy storage module of the shelter is started if any of the following three conditions are met:

[0100] The AC input switch is closed and the AC power is connected;

[0101] There is photovoltaic input and the photovoltaic power generation system communication is normal;

[0102] Turn the power knob to on.

[0103] When the energy storage module is started, the EMS system immediately performs three-phase phase setting for all online energy storage modules in the energy storage cabin. After the phase setting is completed and all energy storage modules enter the standby state, it indicates that the energy storage module in the energy storage cabin has been started.

[0104] In the embodiment of this example, off-grid standby includes:

[0105] 1. After the energy storage module is started, the system enters the off-grid standby state and starts the energy storage module to supply power;

[0106] 2. The energy storage module is powered on and the three-phase insulation indicator light of the energy storage cabin is on. If the photovoltaic power generation system is communicating normally at this time, the photovoltaic power generation system will perform grid connection detection. After the photovoltaic power generation system is successfully connected to the grid, it will perform inverter output to charge the energy storage module.

[0107] 1) The total power of the photovoltaic power generation system is adjustable, and the three phases are evenly divided. There are 9 (the number can be changed, but there is at least one per phase, and each phase host must exist) parallel energy storage modules PCS are in an independent inverter state, and the power is not adjustable. The energy storage module as a current source works in a grid-connected state, and its charging power is adjustable;

[0108] 2) Calculate the maximum power limit of the photovoltaic power generation system:

[0109] Monitor the allowed charging power of all energy storage modules;

[0110] For each phase, the minimum allowable charging power × the number of online devices in that phase is taken as the final allowable charging power of that phase;

[0111] Any phase: the allowed charging power + the allowed charging power of the corresponding current source is taken as the final allowed charging power of the phase;

[0112] Take the smallest allowed charging power of the three phases × 3 as the maximum limiting power of the photovoltaic power generation system;

[0113] The charging power of each current source is configured to be its allowed charging power. The host and slave of each phase are in independent inverter mode and actively absorb power without accepting power regulation of EMS.

[0114] 3. If the energy storage module requests heating under low temperature conditions, the energy storage module requesting heating will be automatically allowed to heat up. After the heating is completed, the energy storage module will automatically turn off the heating switch;

[0115] 4. If the power supply knob is turned to on and the load input switch is closed, it will enter the off-grid power supply state when there is no power grid;

[0116] 5. When the city power is connected, the energy storage module is connected to the grid, and after the connection is completed, it enters the grid connection standby state;

[0117] 6. When there is no mains access, the photovoltaic power generation system communication is abnormal, and the power supply knob is disconnected, the energy storage module will automatically power off after waiting for 30 seconds (configurable). After the energy storage module is powered off, it returns to the system standby state.

[0118] In the embodiment of this example, off-grid power supply includes:

[0119] The cabin power supply knob is closed and the load circuit breaker is closed. The EMS controls the load contactor to close. The following conditions exist:

[0120] 1. There are 9 three-phase energy storage modules in the shelter, and the minimum SOC of the three-phase energy storage modules is greater than SOC1, the first, second and third level load contactors are closed, and the first, second and third level load indicator lights are on;

[0121] 2. When the number of energy storage modules in the three phases is less than 9 (the number can be changed but there is at least 1 unit in each phase, and each phase host must exist) or the minimum SOC of the energy storage module in the three phases is less than SOC1, only the primary load contactor is closed and the primary load indicator light is on;

[0122] 3. When there are 9 energy storage modules in the three-phase, and the minimum SOC power consumption in the three-phase energy storage module is less than SOC1 during operation, the second and third load contactors are disconnected and the second and third load indicator lights are disconnected. At this time, when the three-phase energy storage module is charged to the minimum SOC>SOC2, the second and third load contactors are closed again and the second and third load indicator lights are lit;

[0123] 4. If photovoltaic power generation is connected, the maximum power limit of the photovoltaic power generation system is calculated according to the off-grid standby state, and the charging and discharging power of each phase current source is adjusted according to the load size;

[0124] 5. If the energy storage module requests heating, the energy storage module requesting heating is automatically allowed to heat. After heating is completed, the energy storage module automatically turns off the heating switch;

[0125] 6. When the grid is connected, the energy storage module is connected to the grid, and the grid connection is completed and the grid-connected power supply state is entered;

[0126] 7. When the power supply knob is disconnected, the power supply stops and the system enters off-grid standby mode.

[0127] Where: SOC1—SOC value when disconnecting the second and third level loads;

[0128] SOC1—Restore the SOC value of the second and third level loads

[0129] When the power is off-grid, the master and slave energy storage modules in the three-phase are in independent inversion and cannot be adjusted in power. Only the current source energy storage modules in constant power mode on each phase can be adjusted:

[0130] 1. When the total load power is ≤ Plimit, the current source energy storage module does not supply power to the outside. If the charging conditions are met, the module will be charged;

[0131] 2. When the total load power > Plimit:

[0132] Phase A current source provides power Pacur: if (Pamax×η+Pv / 3-PLa)>=0, then Pacur=0, otherwise Pacur=(PLa-Pamax×η-Pv / 3) / η;

[0133] The B-phase current source provides power Pbcur: if (Pbmax×η+Pv / 3-PLb)>=0, then Pbcur=0, otherwise Pbcur=(PLb-Pbmax×η-Pv / 3) / η;

[0134] The C-phase current source provides power Pccur: if (Pcmax×η+Pv / 3-PLc)>=0, then Pccur=0, otherwise Pccur=(PLc-Pcmax×η-Pv / 3) / η;

[0135] 3. Compare the calculated power provided by each phase current source with the maximum allowable discharge power Pmaxsu of the phase current source. If it is less than the maximum allowable discharge power Pmaxsu, directly send the calculated value of each phase; if it is greater than the maximum allowable discharge power Pmaxsu, send the maximum discharge power value Pmaxsu of each phase.

[0136] Where: Plimit—set operating power limit value;

[0137] Pamax—the maximum allowable discharge power of phase A;

[0138] Pbmax—the maximum allowable discharge power of phase B;

[0139] Pcmax—the maximum allowable discharge power of phase C;

[0140] η—power conversion factor;

[0141] Pv—photovoltaic real-time power;

[0142] Pla, PLb, PLc—are the load powers of phases A, B, and C respectively.

[0143] In the embodiment of this example, grid-connected standby includes:

[0144] 1. When in grid-connected standby mode (each phase host must be present), the power grid and photovoltaic power generation system (if the photovoltaic power generation system is in working state) charge the energy storage modules that are allowed to be charged;

[0145] 2. If the power supply knob is turned to on and the load input switch is closed, it will enter the grid-connected power supply state;

[0146] 3. If the mains power is disconnected, the energy storage module will be disconnected from the grid, and the system will enter the off-grid standby state;

[0147] 4. If the energy storage module requests heating, the energy storage module requesting heating is automatically allowed to heat. After heating is completed, the energy storage module automatically turns off the heating switch;

[0148] 5. If photovoltaic power generation is connected, the maximum power limit of the photovoltaic power generation system is calculated according to the off-grid standby mode;

[0149] 6. If a storage module requests maintenance charging, and the last maintenance charging is more than 90 days (configurable), the maintenance charging request interface will pop up. If maintenance charging is allowed, maintenance charging of all storage modules will be started. During the maintenance charging process, the mains power will be disconnected and the energy storage module will automatically stop maintenance. If maintenance charging is prohibited, it will continue to operate in the current state.

[0150] In the embodiment of this example, grid-connected power supply includes:

[0151] 1. When the number of energy storage modules in the three-phase cabin is 9, the first, second and third level load contactors are closed, and the first, second and third level load indicator lights are on;

[0152] 2. When the number of energy storage modules in the three phases of the shelter is less than 9 (each phase host must exist), only the primary load contactor is closed and the primary load indicator light is on;

[0153] 3. When connected to the grid for power supply, if the load power is small, the energy storage module is allowed to be charged;

[0154] 4. If the energy storage module requests heating, the energy storage module is allowed to heat. After heating is completed, the energy storage module automatically turns off the heating switch;

[0155] 5. If photovoltaic power generation is connected, the maximum power limit of the photovoltaic power generation system is calculated according to the off-grid standby mode;

[0156] 6. When the power supply knob is turned off, all loads are disconnected and the system enters the grid-connected standby state;

[0157] 7. If there is an energy storage module requesting maintenance charging, and the time since the last maintenance charging exceeds the set maintenance interval, the maintenance charging request interface will pop up. If maintenance charging is allowed, maintenance charging of all energy storage modules will be started. During the maintenance charging process, the mains power will be disconnected and the energy storage module will automatically stop maintenance. If maintenance charging is prohibited, it will continue to operate in the current state.

[0158] 8. If the mains power is disconnected, the system will switch to off-grid power supply state.

[0159] In the embodiment of this example, the charging management of the system when the system is off-grid and when the system is connected to the grid includes:

[0160] 1. Off-grid charging management

[0161] When the total load power > Plimit, the system does not have the conditions to charge the energy storage module in the cabin. When the total load power ≤ Plimit, the charging power of each phase current source is adjusted according to the following calculation formula:

[0162] The charging power of the current source of phase A is Pa = (Pv / 3-PLa). If Pa < 0, set Pa = 0, otherwise it is the actual calculated value;

[0163] The chargeable power of the B-phase current source is Pb = (Pv / 3-PLb). If Pb < 0, set Pb = 0, otherwise it is the actual calculated value.

[0164] The C-phase current source can charge the power Pc=Pv / 3-PLc). If Pc<0, set Pc=0, otherwise it is the actual calculated value.

[0165] 2. Grid-connected charging management

[0166] Calculate the charging power that can be provided by the external AC power of phase A: Pa = Pn × the number of online devices in phase A (excluding the current source) + Pv / 3 – PLa;

[0167] Calculate the charging power Pb that can be provided by the external AC power of phase B = Pn × the number of online devices in phase B (excluding the current source) + Pv / 3 – PLb;

[0168] Calculate the charging power that can be provided by the external AC power of phase C: Pc = Pn × the number of online devices in phase C (excluding the current source) + Pv / 3 – PLc;

[0169] Take phase A as an example:

[0170] If Pa≤0, the charging power value of all modules in phase A is 0;

[0171] If Pa>0 and is less than the maximum allowable charging power of the current source of phase A, only the current is charged, and other modules in phase A are not charged;

[0172] If Pa>the allowable charging power of the A-phase current source, the A-phase current source is charged according to the maximum allowable charging power. The other modules of the A-phase calculate a coefficient k×Pacur (maximum allowable charging power). When the maximum allowable charging power of the non-current source in the A-phase is not 0, k=((Pa-Pacur) / (the sum of the maximum allowable charging power values ​​of the non-current sources in the A-phase)). If k≥1, take k=1, otherwise take the actual calculated value.

[0173] Where: Pn is the rated power that the electrical interface of a single energy storage module can withstand.

[0174] In the embodiment of this example, system hibernation includes:

[0175] 1. Local hibernation

[0176] In the system standby state, the system enters the sleep state after running for 1 hour (configurable), and the EMS controller interface prompts "System sleeping..."

[0177] 2. Remote control sleep

[0178] Turn the local / remote control knob to remote control, the system receives the remote control sleep command, stops all energy storage modules, disconnects all relays, and the system enters sleep mode. The controller interface prompts "System in sleep mode..."

[0179] 3. The EMS control power is still present during sleep mode. If the system needs to be restarted, turn off the start / stop knob switch and then turn it back to on.

[0180] In the embodiment of this example, remote control of power on / off includes:

[0181] Turn the local / remote control knob to remote control, and start or cut off the power supply to the cabin through remote control commands.

[0182] In the present exemplary embodiment, system shutdown includes:

[0183] In non-remote control mode (local / remote control knob is turned to local control), turn the start / stop knob to stop at any time to stop all running equipment in the cabin, and then the controller will be powered off and shut down.

[0184] In remote control mode (the local / remote control knob is turned to remote control), after the remote control sleep command, turn the start / stop knob to stop and the system will shut down.

[0185] In the embodiment of this example, the emergency stop includes:

[0186] In non-sleeping state, in any emergency situation, the "emergency stop button" can be pressed to shut down the energy storage module inside the cabin, disconnect the load, disconnect the fan, and the system enters the emergency stop state.

[0187] In the embodiment of this example, the fault protection includes:

[0188] The EMS system detects the system operating status in real time. When a system operation failure occurs (failures include: energy storage module failure, fire protection failure, emergency stop failure), a fault message will pop up on the interface, the system will enter a fault state, and all operating equipment will stop.

[0189] It should be noted that although several modules or units of a multi-module hybrid microgrid energy storage cabin energy management and control system are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the present disclosure, the features and functions of two or more modules or units described above can be concretized in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0190] Furthermore, in this exemplary embodiment, if Figure 2 As shown, a multi-module hybrid microgrid energy storage cabin energy management control system method is also provided. The multi-module hybrid microgrid energy storage cabin energy management control system method may include:

[0191] Step S110, based on each module of the multi-module hybrid microgrid energy storage cabin energy management and control system, the multi-module hybrid microgrid energy storage cabin energy management and control system performs system standby and multi-module energy storage module startup operations;

[0192] Step S120, based on a preset off-grid standby control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled to operate in an off-grid standby mode;

[0193] Step S130, based on a preset off-grid power supply control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin performs off-grid power supply operation control;

[0194] Step S140, based on a preset grid-connected standby control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled to be grid-connected and in standby operation;

[0195] Step S150, based on a preset grid-connected power supply control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled for grid-connected power supply operation;

[0196] Step S160, based on the preset charging power adjustment algorithm of each energy storage module, the charging power of each phase current source energy storage module is adjusted when the photovoltaic is connected when the system is off-grid and when each energy storage module is connected to the grid;

[0197] Step S170, the multi-module hybrid microgrid energy storage cabin energy management and control system is subjected to system sleep, remote terminal remote control power on / off, system shutdown, emergency stop, and fault protection control, wherein the system sleep includes local sleep and remote terminal remote control sleep.

[0198] It should be noted that, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0199] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0200] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0201] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A multi-module hybrid microgrid energy storage cabin energy management and control system, characterized in that: The system includes an energy management and control system EMS for a microgrid energy storage cabin, an energy storage module, a fire protection system, a photovoltaic power generation system, an AC input and output acquisition module, a system circuit breaker and contactor on / off acquisition module, an internal DC relay and indicator light, an energy storage cabin control panel knob, and a remote control terminal, wherein: The energy management and control system EMS of the microgrid energy storage cabin is connected to the 12 three-phase energy storage modules inside the energy storage cabin through a 3-way CAN communication method to control the operation of the energy storage modules in the cabin; the energy management and control system EMS of the microgrid energy storage cabin is connected to the fire protection system inside the energy storage cabin through a 1-way CAN communication method to receive real-time monitoring data of the fire protection system; The EMS is connected to the photovoltaic power generation system via RS485 communication to control and adjust the operation of the photovoltaic power generation system in real time; The EMS is connected to the AC input and output acquisition module via RS485 communication to obtain energy data of the AC input port and the AC output port; The EMS is connected to the system circuit breaker and contactor on-off acquisition module via RS485 communication to obtain on-off data of the energy storage cabin's strong power system; The DO output of the EMS controls the on / off of the internal DC relay and indicator light, and the DI input of the EMS monitors the status of the knob on the energy storage cabin control panel; The EMS is connected to the remote control terminal via TCP communication.

2. The system according to claim 1, characterized in that The energy storage modules in the energy storage cabin of the system further include an A-phase energy storage cabin, a B-phase energy storage cabin, and a C-phase energy storage cabin, and each phase energy storage cabin includes 4 energy storage modules; Each phase energy storage cabin includes 4 energy storage modules, including 1 host energy storage module, 2 slave energy storage modules, and 1 current source energy storage module.

3. The system according to claim 1, characterized in that The system further comprises: The system is manually started based on the power switch of the energy storage cabin control panel. When the power switch is closed, the EMS is powered on and the control system interface displays the current system operation data; After the system is started, the EMS monitors the control panel knobs and external inputs in real time, and starts the energy storage module when preset conditions are met.

4. The system according to claim 2, characterized in that When the system is running in off-grid standby mode: The host energy storage module and the slave energy storage module of the energy storage module operate in an independent inverter state, and the current source energy storage module operates in a grid-connected state; The maximum power limit of the photovoltaic power generation system is calculated to limit the maximum power of photovoltaic power generation, and the photovoltaic charging control of the energy storage module in the system is carried out based on the calculation result and the actual photovoltaic power generation power.

5. The system according to claim 4, characterized in that When the system is operating in an off-grid power supply state: The host energy storage module and the slave energy storage module of the energy storage module operate in an independent inverter state, and the current source energy storage module operates in a grid-connected state; According to the maximum allowable charging power of each energy storage module in real time, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of the photovoltaic power generation system; Calculate the power and total number of the host energy storage module and slave energy storage module of the energy storage module, and provide off-grid power supply at a preset load level; The total load power and the sum of the maximum allowable discharge powers of other non-current source modules in each phase are calculated separately, and the discharge power of the current source energy storage module of each phase is calculated and controlled based on the load power and the sum of the maximum allowable discharge powers of the non-current source energy storage modules. The off-grid power supply of the system is controlled based on the calculation results.

6. The system according to claim 5, characterized in that When the system is running in the grid-connected power supply state: According to the maximum allowable charging power of each energy storage module in real time, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of the photovoltaic power generation system; Carry out load classification management according to the number of online energy storage modules; If the power of each phase load is smaller than the theoretical carrying power of each phase energy storage module, then charge management control of the energy storage module is performed; The energy storage module is maintained and charged based on a preset energy storage module maintenance charging request signal.

7. The system according to claim 6, characterized in that When the system is running in the grid-connected standby state: According to the real-time maximum allowable charging power of each energy storage module, the maximum limiting power of the photovoltaic power generation system is calculated to limit the maximum power of photovoltaic power generation; and the charging power of each module is calculated to control the charging.

8. The system of claim 1, wherein: The system further comprises: Based on the preset charging power regulation algorithm of each module, the charging power of each phase current source energy storage module is regulated when photovoltaic access is made when the system is off-grid, and the charging power of each energy storage module is regulated when the system is connected to the grid.

9. A multi-module hybrid microgrid energy storage cabin energy management control method, characterized in that: The method comprises: Based on each module of the multi-module hybrid microgrid energy storage cabin energy management and control system, the multi-module hybrid microgrid energy storage cabin energy management and control system is operated in system standby and multi-module energy storage module startup; Based on a preset off-grid standby control method, the multi-module hybrid microgrid energy storage cabin energy management and control system performs off-grid standby operation control; Based on a preset off-grid power supply control method, the multi-module hybrid microgrid energy storage cabin energy management and control system performs off-grid power supply operation control; Based on the preset grid-connected standby control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled for grid-connected standby operation; Based on the preset grid-connected power supply control method, the energy management and control system of the multi-module hybrid microgrid energy storage cabin is controlled for grid-connected power supply operation; Based on the preset charging power regulation algorithm for each energy storage module, the charging power of each phase current source energy storage module is regulated when the photovoltaic is connected when the system is off-grid and when the energy storage module is connected to the grid; The multi-module hybrid microgrid energy storage cabin energy management and control system is subjected to system sleep, remote terminal remote control power on / off, system shutdown, emergency stop, and fault protection control. The system sleep includes local sleep and remote terminal remote control sleep.

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