Micro-grid shelter based on multiple energy modules

Abstract

The invention discloses a micro-grid square cabin based on multiple energy modules, which is characterized in that multiple sets of modular micro-grid products are integrated in the square cabin, each modular micro-grid product is formed by combining multiple energy modules, each modular micro-grid product is portable, and the multiple sets of modular micro-grid products can be detached for independent use or combined for use; the electrical and management system is used for realizing unified operation management of multiple sets of micro-grid products; and the human-computer interaction interface is used for displaying the operation states of all the energy modules. The power and capacity superposition of the modular micro-grid product is realized by utilizing the square cabin so as to meet the high-power and high-capacity power supply requirements, and the square cabin is connected to the power grid of the base / camp, so that the asset idle problem of the micro-grid product is avoided, the maintenance problem of the modular micro-grid product is solved, and the maintenance cost is reduced. And the energy modules in the square cabin can be detached to support the distributed multi-point power supply requirement, and the application range of the square cabin type micro-grid is expanded, so that the application range of micro-grid products can be greatly expanded based on the design theory of upward combination and downward detachment, and the use efficiency of the micro-grid products is improved.

Description

Technical Field

[0001] The present invention relates to a distributed microgrid, and in particular to a microgrid cabin based on multiple energy modules. Background Art

[0002] With the rapid development of new energy technologies such as wind power, photovoltaic power generation, energy storage batteries, fuel cells, etc., more and more attention has been paid to the way of combining new energy such as wind power, photovoltaic power generation, energy storage batteries, fuel cells with traditional internal combustion engine power generation to build distributed microgrids for power supply to local areas.

[0003] At present, microgrid products for special applications such as firefighting and emergency rescue are mainly modular portable structures. The power and capacity of a single microgrid are small, and the output is generally 220V AC. There are several problems with this type of product: 1) Small-power, small-capacity modular microgrid products cannot achieve the superposition of power and capacity by connecting multiple machines in parallel to meet the needs of high-power and high-capacity applications, that is, the application scenarios are relatively single; 2) Small-power, small-capacity modular microgrid products cannot be connected to the base or camp power grid for use after returning to the base or camp, that is, such microgrid products have low frequency of use, poor efficiency, and low asset utilization; 3) Small-power, small-capacity modular microgrid products are stored in the warehouse after returning to the base or camp, and need to be maintained regularly one set at a time, which requires a large maintenance workload, and there is even a phenomenon of damage due to untimely maintenance.

[0004] In addition, there are a small number of microgrid products for special applications such as firefighting and emergency rescue. Microgrid products for special applications such as cabins are generally large in power and capacity. There are several problems with these products: 1) High-power and high-capacity cabin-type microgrid products cannot be split for some temporary multi-point application scenarios, that is, the application scenarios are relatively single; 2) High-power and high-capacity cabin-type microgrid products, if some components in the cabin fail or are damaged, will most likely cause the entire system to be paralyzed, that is, the system mission reliability is low. Summary of the invention

[0005] The purpose of the present invention is to propose a microgrid shelter based on multiple energy modules to improve the use scope and efficiency of microgrid products.

[0006] The technical solution to achieve the purpose of the present invention is: a microgrid shelter based on multiple energy modules, which integrates: Multiple sets of modular microgrid products. Modular microgrid products are composed of a variety of energy modules. A single modular microgrid product is portable. Multiple sets of modular microgrid products can be split and used separately or in combination. Electrical and management systems to achieve unified operation and management of multiple microgrid products; The human-computer interaction interface displays the operating status of all energy modules.

[0007] Furthermore, multiple sets of modular microgrid products support on-site multi-machine parallel networking. The power and capacity of the microgrid formed by multi-machine parallel networking are greater than that of a single modular microgrid, but smaller than that of a microgrid cabin.

[0008] Furthermore, the cabin is equipped with a mains grid-connected interface, through which it is connected to the power grid of the base and camp, forming a grid-connected microgrid.

[0009] Furthermore, when all energy modules have insufficient power, the power of the energy modules in the cabin can be gathered to some energy modules through the electrical and management system of the whole vehicle, thereby ensuring that 1~2 sets of modular microgrid products are in a high-power state. When an emergency task occurs, high-power modular microgrid products can be taken out of the cabin for outdoor use.

[0010] Furthermore, when some energy modules fail, they are automatically isolated and the entire cabin outputs normally or at a reduced output to ensure the reliability of the power supply mission of the microgrid cabin.

[0011] Furthermore, the energy module includes a photovoltaic power generation unit, an energy storage unit, a diesel generator set and a microgrid control unit. The microgrid control unit includes an energy storage converter, a photovoltaic controller and an energy management controller. The photovoltaic power generation unit and the energy storage unit are connected to a low-load DC bus. The nominal voltage of the low-load DC bus is 12V, 24V, and 48V, which is used to supply power to low-voltage DC loads; the energy storage converter and the diesel generator set are connected to a 220V AC bus to supply power to AC loads. The photovoltaic controller and the energy management controller control the output energy of the photovoltaic power generation unit and the energy storage unit; the photovoltaic power generation unit, the energy storage unit, the diesel generator set and the microgrid control unit construct a modular photovoltaic-storage-diesel microgrid product.

[0012] Furthermore, the nominal voltage of the low-load DC bus is 48V, the photovoltaic power is 1kW, the energy storage capacity is 6kWh, the diesel generator power is 3kW, and the microgrid control unit output is 3kW / 220V single-phase AC. A single set of modular photovoltaic storage diesel microgrid products can meet temporary 3kW / 220V power supply needs.

[0013] Compared with the prior art, the present invention has the following significant advantages: 1) A microgrid cabin is constructed by using modular energy modules, and multiple sets of modular microgrids can concentrate high-power output in the cabin, and the modular microgrids in the cabin can be quickly taken out for use, which improves the application flexibility of microgrid products and avoids the problem of single function and low asset utilization rate; 2) The cabin microgrid can be connected to the mains grid for operation, avoiding the problem that traditional modular microgrid products can only be stored in the warehouse and need regular maintenance after returning to the base or camp, avoiding the idleness of high-value assets and improving the service life of the modular microgrid; 3) Based on the energy management of the microgrid cabin, the electric energy of the energy module can be collected to some energy modules, so that energy modules with sufficient power can be taken out for use in emergency situations; 4) Without relying on the cabin, multiple sets of modular microgrid products can be quickly connected and operated in the field to meet the power demand of large power or three-phase AC power, expanding the application scenarios of modular microgrids; 5) Based on a large number of modular energy modules, through fault isolation, it can be achieved that some energy modules inside the microgrid cabin can still operate normally or at a reduced rate after failure, thereby improving the power supply reliability of the microgrid cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an architectural diagram of a microgrid cabin based on light, storage and diesel energy modules of the present invention. Figure 2 This is an example diagram of a microgrid system consisting of three 6kW solar-storage-diesel microgrids. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0016] 1. Energy module: The energy module in this article refers to a portable power product with a modular design. Specific power types include power generation (wind power generation unit, photovoltaic power generation unit, internal combustion engine generator set, fuel cell, etc.), energy storage (energy storage battery, super capacitor, etc.), power conversion (inverter, rectifier, energy storage converter, etc.) and energy management products. The energy module can be a single power product mentioned above or a combination of multiple power products.

[0017] 2. Microgrid: In this article, microgrid refers to a distributed small power grid constructed by multiple energy sources such as wind power generation units, photovoltaic power generation units, internal combustion engine generator sets, energy storage batteries, fuel cells, etc., including grid-connected microgrids, off-grid microgrids and other forms.

[0018] A variety of energy modules are integrated and designed in the shelter (the definition of energy modules is shown in the "Abbreviations and Key Terms Definitions" above). The combination of multiple energy modules can build a modular microgrid product. A single set of modular microgrid products has a small output power and a small energy storage capacity. It can be quickly taken out of the shelter and carried out for use, meeting the power supply needs of temporary low-power and small-capacity application scenarios. Multiple sets of modular microgrid products are integrated in the cabin, that is, a microgrid shelter can be split into multiple sets of modular microgrids in case of emergency to meet the power needs of multiple distributed points.

[0019] All modular microgrid products are integrated into a cabin. The electrical and management systems integrated in the cabin can realize the unified operation and management of multiple sets of microgrid products, thus building a cabin-type microgrid product with large output power and large energy storage capacity to meet the power supply needs of high-power and high-capacity application scenarios. The human-computer interaction interface of the cabin can display the operating status of all energy modules.

[0020] Without relying on shelters, multiple sets (the specific number is less than the total number of sets in the shelter) of microgrid products support on-site multi-machine parallel networking, building a microgrid with slightly larger power and capacity (power and capacity are greater than a single set of modular microgrids, but smaller than shelter microgrids) to meet the power supply needs of larger power and larger capacity application scenarios. If a single set of modular microgrid products outputs single-phase 220V AC, more than three sets can be combined to output three-phase 380V AC.

[0021] The square cabin microgrid can be connected to the power grid of the base and the camp to form a grid-connected microgrid, providing more reliable power support for the base and the camp, reducing the electricity costs of the base and the camp and improving asset utilization. In addition, after the square cabin microgrid is connected to the grid, the storage and maintenance requirements of traditional modular microgrid products can be avoided, which can increase the service life of modular microgrid products.

[0022] Based on the cabin, when all energy modules have insufficient power, the power of the energy modules in the cabin can be gathered to some energy modules through the electrical and management system of the whole vehicle, thereby ensuring that 1~2 sets of modular microgrid products are in a high-power state, so that when an emergency task occurs, high-power modular microgrid products can be taken out of the cabin for outdoor use.

[0023] There are a large number of energy modules in the cabin. When some energy modules fail, they can be automatically isolated. The entire cabin can output normally or at a reduced output, thus ensuring that the cabin-type microgrid has extremely high power supply mission reliability. Example

[0024] Figure 1The figure shows a microgrid cabin based on photovoltaic, energy storage and diesel energy modules. The energy module includes a photovoltaic power generation unit, an energy storage unit, a diesel generator set and a microgrid control unit. The microgrid control unit includes an energy storage converter, a photovoltaic controller and an energy management controller. The photovoltaic power generation unit and the energy storage unit are connected to the low-load DC bus. The nominal voltage of the low-load DC bus is 48V, which is used to supply power to low-voltage DC loads; the energy storage converter and the diesel generator set are connected to the 220V AC bus to supply power to AC loads; the photovoltaic controller and the energy management controller control the output energy of the photovoltaic power generation unit and the energy storage unit; the photovoltaic power generation unit, the energy storage unit, the diesel generator set and the microgrid control unit can construct a set of photovoltaic, energy storage and diesel microgrid. There are 6 sets of photovoltaic, energy storage and diesel microgrid products in the cabin shown in the figure. The type and quantity of energy modules can be flexibly adjusted in actual product design. The red line in the figure is the power line. In addition, the control lines existing in the actual product are not reflected in the figure.

[0025] Here, it is assumed that the parameters of each energy module in the cabin are: photovoltaic power is 1kW, energy storage capacity is 6kWh, diesel generator power is 3kW, and the output of the microgrid control unit is 3kW / 220V single-phase AC. A single set of photovoltaic storage diesel microgrid can be quickly taken out of the cabin and carried out for use to meet the temporary 3kW / 220V power supply needs. Six sets of modular microgrid products are integrated in the cabin, that is, one microgrid cabin can be split into six sets of modular microgrids in case of emergency to meet the power needs of six distributed points.

[0026] All modular microgrid products are integrated into a cabin. The integrated electrical and management system in the cabin can realize the unified operation and management of 6 sets of microgrid products, thus building a cabin-type microgrid product with an output power of 18kW, energy storage capacity of 36kWh, photovoltaic power of 6kW, and diesel generator power of 18kW, meeting the 18kW / 380V power supply demand. The human-machine interaction interface of the cabin can display the operating status of all energy modules.

[0027] Without relying on shelters, 2 sets (generally ≤ 3 sets) of modular photovoltaic-storage-diesel microgrid products can support on-site multi-machine parallel networking to build a 6kW / 220V photovoltaic-storage-diesel microgrid to meet the power supply needs of larger power and larger capacity application scenarios. 3 sets of modular photovoltaic-storage-diesel microgrid products can be combined to output 9kW / 380V three-phase AC power.

[0028] The shelter has a mains grid connection interface and can be connected to the power grid of the base and camp to form a grid-connected microgrid, providing more reliable power support for the base and camp, reducing the electricity costs of the base and camp and improving asset utilization. In addition, after the shelter microgrid is connected to the grid, the storage and maintenance requirements of traditional modular microgrid products can be avoided, which can increase the service life of modular microgrid products.

[0029] Based on the cabin, when all energy modules have insufficient power, the power of the energy modules in the cabin can be gathered to some energy modules through the electrical and management system of the whole vehicle, thereby ensuring that 1~2 sets of modular microgrid products are in a high-power state, so that when an emergency task occurs, high-power modular microgrid products can be taken out of the cabin for outdoor use.

[0030] There are a large number of energy modules in the cabin. When some energy modules fail, they can be automatically isolated. The entire cabin can output normally or at a reduced output, thus ensuring that the cabin-type microgrid has extremely high power supply mission reliability.

[0031] Figure 2 The figure shows a microgrid system consisting of three 6kW photovoltaic-storage-diesel microgrids, each of which consists of four parts: a 1kW portable photovoltaic module, a 6kWh portable energy storage module, a 1kW portable diesel generator set, and a microgrid control module. The weight of each module can be carried by one or two people. The 1kW photovoltaic module and the 6kWh energy storage module are connected to the 48V DC bus, and the 1kW diesel generator set, PCS (energy storage converter) and external mains are connected to the 220V AC bus to form a microgrid with a 48V DC bus + 220V AC bus. The 48V DC bus can supply power to DC loads, and the 220V AC bus can supply power to AC loads. Through parallel communication, the phase angle of the output AC power of each microgrid can be controlled, so that the output AC phase angle of the three microgrids can differ by 120°, forming a three-phase 380V, 18kW output microgrid. Through parallel communication, the output AC power of each microgrid can also be controlled to operate in the same phase, that is, the three microgrids can form a single-phase 220V, 18kW output microgrid through the 220V bus.

[0032] To summarize, the present invention integrates the solutions of modular microgrid products and container-type microgrid products, that is, a microgrid container constructed using energy modules. The microgrid container can meet the needs of high-power and high-capacity applications, and can also be connected to the base / camp power grid to provide power support for the base / camp to improve asset utilization. The energy modules in the microgrid container can be quickly disassembled and used to meet the needs of low-power and low-capacity applications at multiple locations. The microgrid container can perform unified maintenance on the energy modules. In short, the use of a microgrid container based on a variety of energy modules can greatly improve the scope of use and efficiency of microgrid products.

[0033] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A microgrid shelter based on multiple energy modules, characterized in that: Integration in the warehouse: Multiple sets of modular microgrid products. Modular microgrid products are composed of a variety of energy modules. A single modular microgrid product is portable. Multiple sets of modular microgrid products can be split and used separately or in combination. Electrical and management systems to achieve unified operation and management of multiple microgrid products; The human-computer interaction interface displays the operating status of all energy modules.

2. The microgrid shelter based on multiple energy modules according to claim 1 is characterized in that: Multiple sets of modular microgrid products support on-site multi-machine parallel networking. The power and capacity of the microgrid formed by multi-machine parallel networking are greater than that of a single modular microgrid, but smaller than a microgrid cabin.

3. The microgrid shelter based on multiple energy modules according to claim 1 is characterized in that: The shelter is equipped with a mains grid-connected interface, through which it is connected to the power grid of the base and camp, forming a grid-connected microgrid.

4. The microgrid shelter based on multiple energy modules according to claim 1, characterized in that: When all energy modules have insufficient power, the power of the energy modules in the cabin is gathered to some energy modules through the electrical and management system of the whole vehicle, so as to ensure that 1~2 sets of modular microgrid products are in a high-power state. When an emergency task occurs, high-power modular microgrid products can be taken out of the cabin for outdoor use.

5. The microgrid shelter based on multiple energy modules according to claim 1, characterized in that: When some energy modules fail, they are automatically isolated and the entire cabin operates normally or at a reduced output to ensure the reliability of the power supply mission of the microgrid cabin.

6. The microgrid shelter based on multiple energy modules according to claim 1, characterized in that: The energy module includes a photovoltaic power generation unit, an energy storage unit, a diesel generator set and a microgrid control unit. The microgrid control unit includes an energy storage converter, a photovoltaic controller and an energy management controller. The photovoltaic power generation unit and the energy storage unit are connected to a low-load DC bus with a nominal voltage of 12V, 24V and 48V, which is used to supply power to low-voltage DC loads. The energy storage converter and the diesel generator set are connected to a 220V AC bus to supply power to AC loads. The photovoltaic controller and the energy management controller control the output energy of the photovoltaic power generation unit and the energy storage unit. The photovoltaic power generation unit, the energy storage unit, the diesel generator set and the microgrid control unit constitute a modular photovoltaic-storage-diesel microgrid product.

7. The microgrid shelter based on multiple energy modules according to claim 6, characterized in that: The nominal voltage of the low-load DC bus is 48V, the photovoltaic power is 1kW, the energy storage capacity is 6kWh, the diesel generator power is 3kW, and the microgrid control unit output is 3kW / 220V single-phase AC. A single set of modular photovoltaic storage diesel microgrid products can meet temporary 3kW / 220V power supply needs.

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