CN111654055A - A Multi-Energy Complementary Mobile Microgrid System - Google Patents

Abstract

The invention discloses a multi-energy complementary mobile micro-grid system, comprising several sub-micro-grid systems and loads, the several sub-micro-grid systems are connected through a communication bus, and the several sub-micro-grid systems are connected to all the sub-micro-grid systems through an AC bus. The sub-microgrid system includes a power station module, a fuel cell module, a photovoltaic module, and an energy storage module, and the photovoltaic module and the fuel cell module are respectively connected to the energy storage module, and the power station module connected to the energy storage module. The invention is mainly suitable for power supply in remote areas such as wild and isolated islands, and has the characteristics of flexibility, energy saving and high efficiency, little environmental disturbance, high reliability of power supply and flexible power expansion.

Description

A Multi-Energy Complementary Mobile Microgrid System

technical field

The invention relates to a multi-energy complementary mobile micro-grid system, which belongs to the technical field of micro-grid systems.

Background technique

For the power supply in remote areas such as the wild and isolated islands, the use of conventional power grid erection will make the grid construction cost and user electricity cost very high, and serious line losses will occur in the process of long-distance power transmission; especially for flexible and changeable outdoor temporary In the power supply scenario, the conventional power grid not only has a long construction period, but also the disposal of the conventional power grid after the power supply is completed will cause a great waste of resources; in the conventional power supply mode, a power station with a certain power level can only supply a specific level of load, and the compatibility is poor. When the number and types increase, it will be difficult to meet the load demand quickly and at low cost; in addition, most of the current mainstream micro-grid systems mainly use diesel power generation systems for power supply, and the power station system is noisy during use, high fuel consumption, and energy utilization. Problems such as low rate are prominent.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a multi-energy complementary mobile micro-grid system, which is mainly suitable for power supply in remote areas such as wild and isolated islands, and has the advantages of flexibility, energy saving and high efficiency, small environmental disturbance, high power supply reliability, and high reliability. Features of flexible power expansion.

The present invention specifically adopts the following technical scheme: a multi-energy complementary mobile microgrid system, including several sub-microgrid systems and loads, the several sub-microgrid systems are connected through a communication bus, and the several sub-microgrid systems are connected by a communication bus. The load is connected to the load through an AC bus; the sub-microgrid system includes a power station module, a fuel cell module, a photovoltaic module, and an energy storage module, and the photovoltaic module and the fuel cell module are respectively connected to the energy storage module , the power station module is connected with the energy storage module.

As a preferred embodiment, several sub-microgrid systems may have the same or different power levels.

As a preferred embodiment, the power station module includes a diesel generator set and a power station converter PCM, the output end of the diesel generator set is connected to the input end of the power station converter PCM, and the power station transformer The output end of the converter PCM is connected to the load and the energy storage module through the AC bus; the electric energy generated by the diesel generator set is processed by the power station converter PCM and supplied to the load or to the energy storage module in the energy storage module. Charging batteries.

As a preferred embodiment, the energy storage module includes an energy storage converter PCS and an energy storage battery, and the energy storage battery is connected to the energy storage converter PCS; the energy storage converter PCS It is used for electric energy conversion, specifically for charging the energy storage battery in the energy storage module by the photovoltaic module, the power station module, and the commercial power, and for charging the energy storage module, the fuel cell module and the energy storage module. The electrical energy generated by the photovoltaic module is converted and supplied to the load.

As a preferred embodiment, the fuel cell module is a hydrogen fuel cell module, which is used for hydrogen production, fast charging, storage and hydrogen power generation. The fuel cell module has a combined heat and power function and can output two Various forms of energy: electrical energy and thermal energy. In addition, the fuel cell module is reserved for an external fuel fast charging interface; the photovoltaic module provides electrical energy for the hydrogen fuel cell module for the preparation of hydrogen. When the energy storage module is insufficient, the The hydrogen fuel cell module works, and the generated electric energy is converted by the inverter module of the energy storage module and then supplied to the load; the electric energy generated by the photovoltaic module is converted by the energy storage module and used to supply the load and the energy storage battery. Charging and fuel preparation of the fuel cell module.

As a preferred embodiment, the microgrid subsystem includes a microgrid coordination controller HC and a power station controller EC, and the microgrid coordination controller HC is connected to the energy storage converter PCS, all the energy storage converters through a control bus. The power station controller EC and the power station converter PCM, the microgrid coordination controller HC is used to schedule the mobile microgrid system to switch between the typical working mode, the silent mode and the emergency working mode.

As a preferred embodiment, the microgrid subsystem does not contain a power station module, and the microgrid subsystem includes a photovoltaic module, an energy storage module, and a fuel cell module configured in a ratio of 2:1:1. The energy module includes an energy storage converter PCS, the energy storage converter PCS is respectively connected to the photovoltaic module, the fuel cell module and the commercial power, and the energy storage module is connected to the load through an AC bus.

As a preferred embodiment, the micro-grid subsystem does not contain a power station module, and the micro-grid subsystem includes photovoltaic modules, energy storage modules, fuel cell modules, fuel A battery endurance module, the energy storage module includes an energy storage converter PCS, the energy storage converter PCS is respectively connected to the photovoltaic module, the fuel cell module and the commercial power, the fuel cell module and the fuel A battery endurance module is connected, and the energy storage module is connected to the load through an AC bus; the fuel cell endurance module undertakes a fuel storage function and is used for quickly filling the fuel cell module with fuel.

As a preferred embodiment, the microgrid subsystem includes a photovoltaic module, a fuel cell module, and a fuel cell endurance module configured in a ratio of 2:1:1, and the fuel cell module includes an energy storage converter PCS, The fuel cell module is respectively connected to the photovoltaic module, the fuel cell endurance module and the commercial power, and the fuel cell module is connected to the load through an AC bus.

As a preferred embodiment, the microgrid subsystem includes a photovoltaic module, a fuel cell module, and a fuel cell endurance module configured in a ratio of 1:1:2, and the fuel cell module includes an energy storage converter PCS, The energy storage converter PCS is respectively connected to the photovoltaic module, the fuel cell endurance module and the commercial power, and the fuel cell module is connected to the load through an AC bus.

As a preferred embodiment, the energy storage converter PCS includes a commercial power boosting module, a photovoltaic boosting module, a charging and discharging module 1, a charging and discharging module 2, and an inverter module. The commercial power boosting module , the photovoltaic booster module, the charging and discharging module 1 and the charging and discharging module 2 are respectively connected with the inverter module; the commercial power is converted by the commercial power boosting module and then confluenced to the DC bus, and the photovoltaic module The output electric energy is converted into the DC bus by the photovoltaic booster module, the output electric energy of the energy storage battery is converted into the DC bus by the charging and discharging module 1, and the output electric energy of the fuel cell is converted by the charging and discharging module 2 and then connected to the DC bus. DC bus; the electric energy on the DC bus is converted by the inverter module and then confluenced to the AC bus to supply the load.

The beneficial effects achieved by the present invention: First, a multi-energy complementary mobile micro-grid system provided by the present invention includes a plurality of micro-grid subsystems. The compatibility of the system to loads of different power levels is improved; secondly, the micro-grid subsystem of the present invention can be configured by power station modules, energy storage modules, fuel cell modules, photovoltaic modules or fuel cell endurance modules according to different proportions, and grouping is the standard The size of the container is compact and flexible; thirdly, under the dispatch of the micro-grid coordination controller, the micro-grid system of the present invention can smoothly switch between the typical working mode, the silent working mode and the emergency working mode, and quickly responds to different working conditions. At the same time, through system scheduling, the running time of power station modules is reduced, the penetration rate of distributed energy resources is increased, and the comprehensive development, full utilization and optimal configuration of various energy sources are realized; fourth, the fuel cell of the present invention stores energy for a long time without attenuation, The system energy is easy to achieve fast replenishment, the fuel cell module has low noise and weak infrared radiation during operation, and can simultaneously output energy in the form of thermal energy and electrical energy; fifth, the fuel cell module in the mobile microgrid system of the present invention improves the microgrid. The battery life of the system realizes the efficient operation of the system, reduces the disturbance to the environment, and improves the concealment of the system.

Description of drawings

FIG. 1 is a schematic diagram of the parallel principle of the sub-microgrid according to the first embodiment of the present invention;

Fig. 2 is the overall principle topology diagram of the sub-microgrid converter of the first embodiment of the present invention;

FIG. 3 is a schematic diagram of the parallel principle of the sub-microgrid according to the second embodiment of the present invention;

FIG. 4 is a schematic diagram of the parallel principle of the sub-microgrid according to the third embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

Embodiment 1: As shown in FIG. 1, the present invention discloses a multi-energy complementary mobile microgrid system, which includes two microgrid subsystems that can work independently and can be used in parallel, namely a sub-microgrid A and a sub-microgrid. Microgrid B; the microgrid subsystem includes power station modules, fuel cell modules, photovoltaic modules, and energy storage modules. The whole adopts a modular design idea. After the four modules are assembled, the structure is a standard-sized container, which is flexible and flexible. It can also be set up in the civil building according to the modular structure, and the application scenarios are flexible and rich; the microgrid subsystem is highly scalable, and the connection between the communication bus and the AC bus can make the connection between multiple microgrid units. For loads of different power levels, the communication bus carries out external communication through the electro-optical converter MC and the wireless network adapter GC.

The control bus of the entire mobile microgrid system can connect multiple microgrid coordination controllers HC, energy storage converters PCS, multiple power station controllers EC and multiple power station converters PCM; in the microgrid coordination controller HC scheduling The lower mobile microgrid system switches between typical mode, silent mode and emergency working mode. In the typical mode, the photovoltaic module runs at full power to supply the load, the energy storage module and the fuel cell module. The power station module acts as a supplement to other modules, and starts according to the load condition, the power generation condition of the photovoltaic module, and the energy storage condition of the energy storage module and the fuel cell module. ;In the silent mode, the power station module stops running, the energy storage module works, and the fuel cell module acts as a supplement to the energy storage module and operates silently; in the emergency mode, the system communication is interrupted, and the scheduling of the microgrid coordination controller HC is lost, according to the pre-programmed settings , the power station module runs at a predetermined speed, and the energy storage module and the fuel cell module cooperate to increase the depth of discharge to ensure the continuous operation of important loads.

Embodiment 2: As shown in Figure 2, the micro-grid subsystem of the present invention includes an AC bus and a DC bus, the mains is converted by the mains boost module and then confluenced to the DC bus, and the output power of the photovoltaic module is converted by the photovoltaic boost module. Converged to the DC bus, the output power of the energy storage battery is converted by the charging and discharging module 1 and then confluent to the DC bus, and the output power of the fuel cell module is converted by the charging and discharging module 2 and connected to the DC bus; the power on the DC bus is converted by the energy storage converter. After the inverter module of the PCS is converted, it is confluenced to the AC bus to supply the load. The power of the power station module is converted by the power station converter PCM and then confluenced to the AC bus to supply the load or reversely charge the energy storage battery of the energy storage module; when the mains system When it is detected that the voltage and phase of the commercial power are the same as the mobile micro-grid system of the present invention, the bypass switch is closed to connect the commercial power to the AC bus and directly supply the load to the load. The mains booster module, photovoltaic booster module, charge-discharge module 1 and charge-discharge module 2 are arranged in the energy storage module through the DC bus, which improves the charging efficiency of the battery and saves space; The energy storage of the system can supplement energy to the energy storage module and the fuel cell module through the DC bus; the mains system and the power station module can also flow through the AC bus and the inverter of the energy storage converter PCS in turn according to the load and system energy storage. The modules and DC busbars supply energy to the energy storage modules and the fuel cell modules; further energy storage converter PCS adopts an optical storage integrated machine, and the rest are the same as those in Embodiment 1.

Embodiment 3: As shown in Figure 3, the mobile microgrid system may not include a power station module. In order to extend the battery life of the system and take into account the concept of combining four parts into standard containers, the entire microgrid subsystem can be composed of photovoltaic modules and energy storage modules. , The fuel cell module is configured in a ratio of 2:1:1. In addition, the entire system can also be configured by photovoltaic modules, energy storage modules, fuel cell modules, and fuel cell endurance modules in a ratio of 1:1:1:1. The battery life module is mainly responsible for the storage function of fuel, and the rest are the same as those in Embodiment 1.

Embodiment 4: As shown in Figure 4, the mobile microgrid system may not include power station modules and energy storage modules, to ensure the battery life of the system and take into account the concept that the four parts are combined into standard containers. The entire microgrid subsystem can be composed of photovoltaic modules, fuel The battery module and the fuel cell endurance module are configured in a ratio of 2:1:1. At this time, the energy storage converter PCS is arranged in the fuel cell module, including DC-DC, DC-AC, photovoltaic input and other modules, and the rest are the same.

Example 1.

It should be noted that the fuel cell module and the fuel cell endurance module in the multi-energy complementary mobile microgrid system of the present invention may be hydrogen energy fuel cells, aluminum-magnesium fuel cells, methanol fuel cells, etc. and corresponding endurance modules; The energy storage module can be an electrochemical energy storage module, such as lithium battery, lead-carbon battery, sodium sulfur battery, etc., or a super capacitor energy storage module, a compressed air energy storage module, etc.; the power station module can be a diesel generator module, gasoline The generator module may also be a gas turbine generator module, etc.; the photovoltaic module may also be a new energy module such as a wind energy module that does not require replenishment.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. The mobile micro-grid system with the multiple complementary functions is characterized by comprising a plurality of sub-micro-grid systems and a load, wherein the sub-micro-grid systems are connected through a communication bus, and the sub-micro-grid systems are connected with the load through an alternating current bus; the sub-microgrid system comprises a power station module, a fuel cell module, a photovoltaic module and an energy storage module, wherein the photovoltaic module and the fuel cell module are respectively connected with the energy storage module, and the power station module is connected with the energy storage module.

2. The multi-energy complementary mobile microgrid system of claim 1, characterized in that the power station module comprises a diesel generator set and a power station converter PCM, an output end of the diesel generator set is connected with an input end of the power station converter PCM, and an output end of the power station converter PCM is connected with the load and the energy storage module through an alternating current bus; and the electric energy generated by the diesel generating set is processed by the power station converter PCM and then supplied to the load or a battery in the energy storage module for charging.

3. The multi-energy complementary mobile microgrid system of claim 2, characterized in that the energy storage module comprises an energy storage converter (PCS), an energy storage battery, and the energy storage battery is connected with the energy storage converter (PCS); the energy storage converter PCS is used for electric energy conversion, and is specifically used for charging the energy storage battery in the energy storage module by the photovoltaic module, the power station module and a mains supply, and converting electric energy generated by the energy storage module, the fuel cell module and the photovoltaic module and then supplying the converted electric energy to the load.

4. The multi-energy complementary mobile microgrid system of claim 1, wherein the fuel cell modules are hydrogen energy fuel cell modules for hydrogen gas production, quick charging, storage and hydrogen energy power generation; the electric energy generated by the photovoltaic module is converted by the energy storage module and then used for supplying the load, charging the energy storage battery and preparing the fuel of the fuel cell module.

5. The multi-energy complementary mobile microgrid system according to claim 3, characterized in that the microgrid subsystem comprises a microgrid coordination controller (HC) and a station controller (EC), the microgrid coordination controller (HC) is connected with the energy storage converter (PCS), the station controller (EC) and the station converter (PCM) through control buses, and the microgrid coordination controller (HC) is used for scheduling the mobile microgrid system to switch among a typical operation mode, a silent mode and an emergency operation mode.

6. The multi-energy complementary mobile microgrid system of claim 1, wherein the microgrid subsystem does not contain a power station module, the microgrid subsystem comprises a photovoltaic module, an energy storage module and a fuel cell module which are arranged according to a 2:1:1 ratio, the energy storage module comprises an energy storage converter (PCS), the energy storage converter (PCS) is respectively connected with the photovoltaic module, the fuel cell module and a mains supply, and the energy storage module is externally connected with the load through an alternating current bus.

7. The multi-energy complementary mobile microgrid system of claim 1, wherein the microgrid subsystem does not contain a power station module, the microgrid subsystem comprises a photovoltaic module, an energy storage module, a fuel cell module and a fuel cell cruising module which are configured according to a ratio of 1:1:1:1, the energy storage module comprises an energy storage converter (PCS), the PCS is respectively connected with the photovoltaic module, the fuel cell module and a mains supply, the fuel cell module is connected with the fuel cell cruising module, and the energy storage module is externally connected with the load through an alternating current bus; the fuel cell endurance module assumes a fuel storage function for rapidly charging the fuel cell module with fuel.

8. The multi-energy complementary mobile microgrid system of claim 1, characterized in that the microgrid subsystem comprises a photovoltaic module, a fuel cell module and a fuel cell endurance module which are configured according to a ratio of 2:1:1, the fuel cell module comprises an energy storage converter (PCS), the fuel cell module is respectively connected with the photovoltaic module, the fuel cell endurance module and a mains supply, and the fuel cell module is connected with the load through an alternating current bus.

9. The multi-energy complementary mobile microgrid system of claim 1, characterized in that the microgrid subsystem comprises a photovoltaic module, a fuel cell module and a fuel cell endurance module which are configured according to a ratio of 1:1:2, the fuel cell module comprises an energy storage converter (PCS) which is respectively connected with the photovoltaic module, the fuel cell endurance module and a mains supply, and the fuel cell module is connected with the load through an alternating current bus.

10. The multi-energy complementary mobile microgrid system according to any one of claims 3 and 5 to 9, characterized in that the energy storage converter PCS comprises a mains supply voltage boosting module, a photovoltaic voltage boosting module, a charge and discharge module 1, a charge and discharge module 2 and an inversion module, and the mains supply voltage boosting module, the photovoltaic voltage boosting module, the charge and discharge module 1 and the charge and discharge module 2 are respectively connected with the inversion module; the commercial power is converted by the commercial power boosting module and then converged to the direct current bus, the electric energy output by the photovoltaic module is converted by the photovoltaic boosting module and then converged to the direct current bus, the electric energy output by the energy storage battery is converted by the charging and discharging module 1 and then converged to the direct current bus, and the electric energy output by the fuel battery is converted by the charging and discharging module 2 and then is connected to the direct current bus; and the electric energy on the direct current bus is converted by the inverter module and then converged to the alternating current bus to be supplied to the load.

Images