CN103107531B - Energy control method of intelligent building direct current micro-grid based on distributed generation and uninterrupted power supply (UPS) energy storage integration - Google Patents

Abstract

An energy control method based on the integration of distributed power generation and UPS energy storage to realize the DC micro-grid of intelligent buildings belongs to the field of intelligent buildings. It needs to set up a separate energy storage system in order to solve the existing distributed power generation smart building micro-grid, which will affect the utilization rate of energy storage capacity. The current smart building micro-grid has a single energy supply mode and cannot reasonably control the distributed power generation system. energy problem. In the present invention, the distributed power generation system, the uninterruptible power supply UPS and the electrical equipment are connected together through the DC bus, and at the same time, the 220V alternating current supplies energy to the uninterruptible power supply UPS through the AC/DC rectifier, and the threshold value in the uninterruptible power supply UPS is set. The management controller distributes the energy stored in the UPS according to the threshold.

Description

An energy control method based on the integration of distributed power generation and UPS energy storage for the realization of DC microgrid in intelligent buildings

technical field

The invention relates to an intelligent building DC microgrid based on the integration of distributed power generation and UPS energy storage, and belongs to the field of intelligent buildings.

Background technique

Distributed power generation helps to promote sustainable energy development, improve the environment and enhance the competitiveness of green energy. In intelligent buildings, the application of BIPV photovoltaic power generation and elevator power regeneration can alleviate the power shortage and ensure the power supply of buildings. It is of great significance to reduce the dependence on traditional energy sources and promote building energy conservation and emission reduction.

At present, there are two types of distributed power generation. One is to feed back the power to the grid, that is, the grid-connected type; the other is to apply it locally, that is, the off-grid type. It is a very effective method to feed the electric energy generated by the distributed generation system back to the grid. However, with the large-scale grid connection of distributed new energy generation, the randomness and intermittent nature of distributed generation can have a huge impact and impact on the grid. As far as China's current power grid situation is concerned, there are still some technical problems and policy barriers for large-scale distributed power generation to be connected to the grid. For example, the non-uniform specifications and standards of inverters used by users lead to uneven power quality fed back to the grid, which will instead become a source of pollution to the grid, affecting the use of other users in the grid and the safety of the grid.

In smart buildings, distributed power generation systems directly face power users and can be used directly in buildings, avoiding a series of problems caused by grid connection, and are easy to plan and implement at the regional level. Therefore, the off-grid operation of distributed power generation systems in smart buildings is a current reality, but looking to the future, it is an inevitable development trend to study smart building micro-grids that can operate both off-grid and grid-connected. Therefore, it is urgent to build a practical smart building micro-grid to provide technical support and an effective platform for the application of distributed power generation in smart buildings.

At present, BIPV photovoltaic power generation, elevator power regeneration, and UPS energy storage in smart buildings usually use batteries or super capacitors as energy storage devices. For example, the patent application No. 201020607246 discloses a new type of supercapacitor elevator energy-saving control device, which stores the braking energy of the elevator traction machine in the supercapacitor bank, and when the elevator traction When working, it releases energy and provides peak power to achieve the purpose of energy saving; the patent application number is 200610117501.3, which discloses an automatic switching circuit for supplementary charging of battery mains by solar lighting system, which can make full use of solar energy.

In intelligent buildings, there are generally UPS uninterruptible power supply systems, but the frequency of use of UPS is very low, and most of the UPS energy storage capacity is idle, that is, the utilization rate of energy storage capacity is very low. If the UPS energy storage system is used for energy storage of distributed power generation, the distributed power generation system does not need to set up a separate energy storage system, which can reduce the cost of energy storage in the smart building micro-grid system and improve the utilization efficiency of energy storage capacity. The existing distributed generation smart building microgrid needs to set up a separate energy storage system, which increases the cost of energy storage for the building microgrid system.

Contents of the invention

In order to solve the problem that the existing distributed power generation intelligent building micro-grid needs to set up a separate energy storage system, which in turn affects the utilization rate of energy storage capacity, the current intelligent building micro-grid has a single energy supply mode and cannot reasonably control the distributed power generation system In order to solve the energy problem generated, a smart building DC micro-grid based on the integration of distributed power generation and UPS energy storage and an energy control method realized by using the energy control method realized by this micro-grid are proposed.

An energy control method based on an intelligent building DC micro-grid integrating distributed power generation and UPS energy storage. The method is realized based on an intelligent building DC micro-grid integrating distributed power generation and UPS energy storage. The smart building DC microgrid with energy storage integration includes distributed power generation system, first DC/DC converter, second DC/DC converter, third DC/DC converter, fourth DC/DC converter, DC/AC Converter, first power electronic converter, second power electronic converter, third power electronic converter, AC/DC rectifier, elevator, air conditioner, electrical equipment, uninterruptible power supply UPS, emergency lighting/firefighting system, energy management controller and DC bus,

The first DC power supply signal output terminal of the distributed power generation system is connected to the DC signal input terminal of the first DC/DC converter, and the second DC power supply signal output terminal of the distributed power generation system is connected to the second DC/DC converter connected to the DC signal input terminal of the first DC/DC converter, the DC power signal output terminal of the first DC/DC converter and the DC power signal output terminal of the second DC/DC converter are both connected to the DC bus, and the first AC power signal output of the distributed generation system terminal is connected to the AC signal input terminal of the first power electronic converter, the second AC power supply signal output terminal of the distributed power generation system is connected to the AC signal input terminal of the second power electronic converter, and the AC power supply of the first power electronic converter Both the signal output terminal and the AC power signal output terminal of the second power electronic converter are connected to the DC bus, the AC signal output terminal of the 220V AC power is connected to the AC signal input terminal of the AD/DC rectifier, and the DC signal output terminal of the AD/DC rectifier is connected to DC bus, the DC power signal input terminal of the third DC/DC converter is connected to the DC bus, the power supply terminal of the third DC/DC converter is connected to the power receiving terminal of the elevator, and the DC power signal input of the fourth DC/DC converter connected to the DC bus, the power supply terminal of the fourth DC/DC converter is connected to the receiving terminal of the air conditioner, the DC signal input terminal of the third power electronic converter is connected to the DC bus, and the power supply terminal of the third power electronic converter is connected to the power receiving terminal of the air conditioner. The power receiving end of the equipment is connected, the power output/input end of the uninterruptible power supply UPS is connected to the DC bus, the power output end of the uninterruptible power supply UPS is connected to the power input end of the DC/AC converter, and the signal output end of the DC/AC converter It is connected to the signal input terminal of the emergency lighting/fire protection system, the control signal input/output terminal of the uninterruptible power supply UPS is connected to the control signal output/input terminal of the energy management controller, and the DC signal input terminal of the energy management controller is connected to the DC bus. The voltage signal input/output end of the energy management controller is connected to the voltage signal output/input end of the AD/DC rectifier,

Based on the energy control method realized by the DC micro-grid of intelligent buildings based on the integration of distributed power generation and UPS energy storage, the control method is:

The distributed power generation system, uninterruptible power supply UPS and electrical equipment are connected together through the DC bus, and the electric energy generated by the elevator electric energy regeneration power generation system in the distributed power generation system, the electric energy converted by the BIPV building photovoltaic power generation system, and the biomass power generation system are converted. The electric energy and the electric energy generated by other distributed energy systems are stored in the uninterruptible power supply UPS through the first DC/DC converter, the second DC/DC converter, the first power electronic converter and the second power electronic converter respectively. , and at the same time, 220V AC supplies energy to the uninterruptible power supply UPS through the AC/DC rectifier,

Set the threshold in the UPS9, and the energy management controller allocates the energy stored in the UPS according to the threshold, and the specific allocation method is as follows:

Real-time monitoring of the discharge voltage of the uninterruptible power supply UPS through the energy management controller,

When the discharge voltage is greater than the threshold, the uninterruptible power supply UPS supplies power to the elevator, air conditioner and electrical equipment through the third DC/DC converter, the fourth DC/DC converter and the third power electronic converter;

When the discharge voltage is equal to the threshold, the uninterruptible power supply UPS stores energy;

When the discharge voltage is lower than the set threshold, the uninterruptible power supply UPS supplies power to the emergency lighting/firefighting system through the DC/AC converter. At the same time, the energy management controller detects the voltage of the DC bus. If the voltage of the DC bus is lower than the operating voltage, The energy management controller switches the power supply of the uninterruptible power supply UPS and connects it with the external 220V AC power supply to store energy for the uninterruptible power supply UPS.

The present invention adopts the combination of the distributed power generation system and the uninterruptible power supply UPS, and the uninterruptible power supply UPS is used as the energy storage of the distributed power generation, so the distributed power generation system does not need to set up a separate energy storage system, and the power generation and The energy storage of uninterruptible power supply UPS realizes the control of energy, which can reduce the cost of energy storage of intelligent building microgrid system.

Description of drawings

Fig. 1 is a structural block diagram of a smart building DC micro-grid based on the integration of distributed power generation and UPS energy storage described in Embodiment 1;

Fig. 2 is the power supply schematic diagram of uninterruptible power supply UPS among the present invention;

Fig. 3 is a schematic diagram of the distribution of energy storage capacity of the uninterruptible power supply UPS in the present invention, wherein, b represents the input of distributed energy and alternating current.

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. The smart building DC micro-grid based on the integration of distributed power generation and UPS energy storage described in this embodiment includes a distributed power generation system 1 and a first DC/DC converter. 2-1, second DC/DC converter 2-2, third DC/DC converter 2-3, fourth DC/DC converter 2-4, DC/AC converter 4, first power electronic converter 3-1, the second power electronic converter 3-2, the third power electronic converter 3-3, AC/DC rectifier 5, elevator 6, air conditioner 7, electrical equipment 8, uninterruptible power supply UPS9, emergency lighting/fire fighting system 10, energy management controller 11 and DC bus a,

The first DC power signal output end of the distributed power generation system 1 is connected to the DC signal input end of the first DC/DC converter 2-1, and the second DC power signal output end of the distributed power generation system 1 is connected to the second The DC signal input terminals of the DC/DC converter 2-2 are connected, and the DC power signal output terminals of the first DC/DC converter 2-1 are connected to the DC power signal output terminals of the second DC/DC converter 2-2. DC bus a, the first AC power signal output end of the distributed power generation system 1 is connected to the AC signal input end of the first power electronic converter 3-1, and the second AC power signal output end of the distributed power generation system 1 is connected to the second The AC signal input terminals of the power electronic converter 3-2 are connected, and the AC power signal output terminals of the first power electronic converter 3-1 and the AC power signal output terminals of the second power electronic converter 3-2 are both connected to the DC bus a , the AC signal output terminal of the 220V AC power is connected to the AC signal input terminal of the AD/DC rectifier 5, the DC signal output terminal of the AD/DC rectifier 5 is connected to the DC bus a, and the DC power supply signal of the third DC/DC converter 2-3 The input end is connected to the DC bus a, the power supply end of the third DC/DC converter 2-3 is connected to the power receiving end of the elevator 6, and the DC power signal input end of the fourth DC/DC converter 2-4 is connected to the DC bus a, The power supply end of the fourth DC/DC converter 2-4 is connected to the power receiving end of the air conditioner 7, the DC signal input end of the third power electronic converter 3-3 is connected to the DC bus a, and the third power electronic converter 3-3 The power supply end of the uninterruptible power supply UPS9 is connected to the power receiving end of the electrical equipment 8, the power output/input end of the uninterruptible power supply UPS9 is connected to the DC bus a, the power output end of the uninterruptible power supply UPS9 is connected to the power input end of the DC/AC converter 4, The signal output end of the DC/AC converter 4 is connected to the signal input end of the emergency lighting/firefighting system 10, the control signal input/output end of the uninterruptible power supply UPS9 is connected to the control signal output/input end of the energy management controller 11, and the energy The DC signal input end of the management controller 11 is connected to the DC bus a, and the voltage signal input/output end of the energy management controller 11 is connected to the voltage signal output/input end of the AD/DC rectifier 5 .

In the present invention, the distributed power generation system, the uninterruptible power supply UPS and the electrical equipment are connected together through a DC bus, and the energy stored in the uninterruptible power supply UPS is transferred to the elevator, air conditioner, and electrical equipment through a DC/DC converter or a power electronic converter. And emergency lighting/firefighting system power supply, so that the energy in the building can be used reasonably and the energy utilization rate can be improved.

Specific Embodiment 2: The difference between this embodiment and the smart building DC micro-grid based on distributed power generation and UPS energy storage integration described in the specific embodiment is that the distributed power generation system 1 includes an elevator electric energy regeneration power generation system 1-1, BIPV building photovoltaic power generation system 1-2, biomass power generation system 1-3 and other distributed energy systems 1-4,

The DC power supply signal output terminal of the elevator electric energy regeneration power generation system 1-1 is connected to the DC signal input terminal of the first DC/DC converter 2-1, and the DC power supply signal output terminal of the BIPV building photovoltaic power generation system 1-2 is connected to the first DC power supply signal input terminal of the first DC/DC converter 2-1. The DC signal input terminals of the two DC/DC converters 2-2 are connected, the AC power signal output terminals of the biomass power generation system 1-3 are connected with the AC signal input terminals of the first power electronic converter 3-1, and other distributed The AC power signal output terminal of the energy system 1-4 is connected to the AC signal input terminal of the second power electronic converter 3-2.

Specific embodiment three: What this embodiment describes is the energy control method implemented by the smart building DC micro-grid based on the integration of distributed power generation and UPS energy storage described in specific embodiment one. The control method is:

The distributed power generation system, uninterruptible power supply UPS and electrical equipment are connected together through the DC bus, and the electric energy generated by the elevator electric energy regeneration power generation system 1-1 in the distributed power generation system 1 and the electric energy converted by the BIPV building photovoltaic power generation system 1-2 are connected together. 1. The electric energy converted by the biomass power generation system 1-3 and the electric energy generated by other distributed energy systems 1-4 pass through the first DC/DC converter 2-1, the second DC/DC converter 2-2, and the first DC/DC converter 2-2 respectively. The power electronic converter 3-1 and the second power electronic converter 3-2 store energy for the uninterruptible power supply UPS9, and at the same time, the 220V alternating current supplies energy to the uninterruptible power supply UPS9 through the AC/DC rectifier,

Set the threshold in the UPS9, and the energy management controller allocates the energy stored in the UPS9 according to the threshold, and the specific allocation method is as follows:

Real-time monitoring of the discharge voltage of the uninterruptible power supply UPS9 through the energy management controller,

When the discharge voltage is greater than the threshold value, the uninterruptible power supply UPS9 supplies the elevator, air conditioner and power supply for electrical equipment;

When the discharge voltage is equal to the threshold, the uninterruptible power supply UPS9 stores energy;

When the discharge voltage is less than the set threshold, the uninterruptible power supply UPS9 supplies power to the emergency lighting/firefighting system through the DC/AC converter 4, and at the same time, the energy management controller 11 detects the voltage of the DC bus a, if the voltage of the DC bus a is lower than When the working voltage is in operation, the energy management controller switches the power supply of the uninterruptible power supply UPS9 and connects it with an external 220V AC power supply to store energy for the uninterruptible power supply UPS9.

In this embodiment, the solution uses the uninterruptible power supply (UPS) to rationally control energy to achieve the purpose of energy storage in the distributed power generation system of the smart building microgrid, while taking into account that the function of the uninterruptible power supply (UPS) is not affected. The energy stored in the UPS is used to supply power to elevators, air conditioners, emergency lighting and other systems, and the energy generated by the building itself is rationally used, as shown in Figure 2.

At the same time, in order to make reasonable use of the capacity of the UPS and ensure the normal power supply of the emergency lighting system, the capacity of the UPS is divided. By setting the threshold, the UPS can supply power to elevators, air conditioners and other equipment if the capacity exceeds the threshold. Below the threshold, the UPS only plays the role of energy storage. There is enough margin to ensure the use of emergency lighting/firefighting system, as shown in Figure 3.

The uninterruptible power supply UPS not only plays the role of supercapacitor energy storage and providing electric energy, but also plays the role of its own uninterruptible power supply, so that the energy system of the building is more economical and reasonable.

The smart building DC micro-grid based on the integration of distributed power generation and UPS energy storage is a practical and effective energy supply method, which can reduce energy waste, avoid polluting the power grid, reduce building energy consumption, and provide reference for building energy-saving engineering applications.

Integrating distributed power generation and building energy storage UPS system fully exploits the energy storage capacity of UPS. While achieving the purpose of energy storage in distributed power generation systems, the function of UPS is not affected, and at the same time, it also meets the needs of other equipment. electricity demand and improve the utilization efficiency of storage capacity.

Claims (2)

1. An energy control method based on an intelligent building DC microgrid integrating distributed power generation and UPS energy storage. The method is realized based on an intelligent building DC microgrid integrating distributed power generation and UPS energy storage. The smart building DC microgrid integrated with UPS energy storage includes a distributed power generation system (1), a first DC/DC converter (2-1), a second DC/DC converter (2-2), a third DC/DC DC converter (2-3), fourth DC/DC converter (2-4), DC/AC converter (4), first power electronic converter (3-1), second power electronic converter ( 3-2), the third power electronic converter (3-3), AC/DC rectifier (5), elevator (6), air conditioner (7), electrical equipment (8), uninterruptible power supply UPS (9), emergency lighting/firefighting system (10), energy management controller (11) and DC bus (a), The first DC power supply signal output terminal of the distributed power generation system (1) is connected to the DC signal input terminal of the first DC/DC converter (2-1), and the second DC power supply terminal of the distributed power generation system (1) The signal output terminal is connected with the DC signal input terminal of the second DC/DC converter (2-2), and the DC power supply signal output terminal of the first DC/DC converter (2-1) is connected with the second DC/DC converter ( 2-2) the DC power signal output terminals are connected to the DC bus (a), the first AC power signal output terminal of the distributed power generation system (1) and the AC signal input terminal of the first power electronic converter (3-1) connected, the second AC power supply signal output terminal of the distributed power generation system (1) is connected to the AC signal input terminal of the second power electronic converter (3-2), and the AC power supply of the first power electronic converter (3-1) Both the signal output terminal and the AC power signal output terminal of the second power electronic converter (3-2) are connected to the DC bus (a), and the AC signal output terminal of the 220V AC power is connected to the AC signal input terminal of the AD/DC rectifier (5) , the DC signal output end of the AD/DC rectifier (5) is connected to the DC bus (a), the DC power signal input end of the third DC/DC converter (2-3) is connected to the DC bus (a), and the third DC/DC The power supply end of the converter (2-3) is connected to the receiving end of the elevator (6), the DC power signal input end of the fourth DC/DC converter (2-4) is connected to the DC bus (a), and the fourth DC/DC converter (2-4) is connected to the DC bus (a). The power supply terminal of the DC converter (2-4) is connected to the power receiving terminal of the air conditioner (7), the DC signal input terminal of the third power electronic converter (3-3) is connected to the DC bus (a), and the third power electronic converter The power supply end of the device (3-3) is connected to the power receiving end of the electric equipment (8), the power output/input end of the uninterruptible power supply UPS (9) is connected to the DC bus (a), and the uninterruptible power supply UPS (9) The power output terminal is connected to the power input terminal of the DC/AC converter (4), the signal output terminal of the DC/AC converter (4) is connected to the signal input terminal of the emergency lighting/fire fighting system (10), and the uninterruptible power supply UPS ( 9) the control signal input/output end is connected to the control signal output/input end of the energy management controller (11), the DC signal input end of the energy management controller (11) is connected to the DC bus (a), and the energy management controller ( 11) the voltage signal input/output end is connected with the voltage signal output/input end of the AD/DC rectifier (5), It is characterized in that, based on the energy control method realized by the DC micro-grid of intelligent buildings based on the integration of distributed power generation and UPS energy storage, the control method is: The distributed power generation system, the uninterruptible power supply UPS and the electrical equipment are connected together through the DC bus, and the electric energy generated by the elevator electric energy regeneration power generation system (1-1) in the distributed power generation system (1) and the BIPV building photovoltaic power generation system (1 -2) The converted electric energy, the electric energy converted by the biomass power generation system (1-3) and the electric energy generated by other distributed energy systems (1-4) respectively pass through the first DC/DC converter (2-1), the second Two DC/DC converters (2-2), the first power electronic converter (3-1) and the second power electronic converter (3-2) store energy to the uninterruptible power supply UPS (9), and 220V alternating current supply energy to uninterruptible power supply UPS (9) through AC/DC rectifier, Set the threshold in the UPS (9), and the energy management controller distributes the energy stored in the UPS (9) according to the threshold, and the specific distribution method is as follows: Real-time monitoring of the discharge voltage of the uninterruptible power supply UPS (9) through the energy management controller, When the discharge voltage is greater than the threshold value, the uninterruptible power supply UPS (9) passes through the third DC/DC converter (2-3), the fourth DC/DC converter (2-4) and the third power electronic converter ( 3-3) Supply power to elevators, air conditioners and electrical equipment; When the discharge voltage is equal to the threshold value, the uninterruptible power supply UPS (9) stores energy; When the discharge voltage is lower than the set threshold, the uninterruptible power supply UPS (9) supplies power to the emergency lighting/firefighting system through the DC/AC converter (4), and at the same time, the energy management controller (11) detects the voltage of the DC bus (a) , if the voltage of the DC bus (a) is lower than the working voltage, the energy management controller switches the power supply of the UPS (9) to be connected to an external 220V AC power supply to store energy for the UPS (9). 2. The energy control method realized based on distributed power generation and UPS energy storage integrated DC micro-grid of intelligent building according to claim 1, characterized in that the distributed power generation system (1) comprises an elevator electric energy regeneration power generation system (1- 1), BIPV building photovoltaic power generation system (1-2), biomass power generation system (1-3) and other distributed energy systems (1-4), The DC power signal output terminal of the elevator electric energy regeneration power generation system (1-1) is connected to the DC signal input terminal of the first DC/DC converter (2-1), and the DC signal input terminal of the BIPV building photovoltaic power generation system (1-2) The power signal output end is connected to the DC signal input end of the second DC/DC converter (2-2), and the AC power signal output end of the biomass power generation system (1-3) is connected to the first power electronic converter (3- The AC signal input terminals of 1) are connected, and the AC power signal output terminals of other distributed energy systems (1-4) are connected with the AC signal input terminals of the second power electronic converter (3-2).