CN110098630A - Energy storage for power supply system and energy storage for power supply case - Google Patents

Abstract

The present application relates to an energy storage power supply system, including: an energy storage device, an energy storage management device, a bidirectional converter, an energy storage monitoring terminal, and an energy storage monitoring background device installed in a grid control center. The DC terminal of the energy storage device is electrically connected to the bidirectional converter device, the AC terminal of the bidirectional converter device is used to connect to the power grid, the energy storage device is electrically connected to the energy storage management device, and the energy storage monitoring terminal is connected to the energy storage management device and the bidirectional converter respectively. The converter device and the energy storage monitoring background equipment are connected by communication. The energy storage status information and commutation status information are reported through the energy storage management device and the bidirectional converter device, and the energy storage monitoring terminal and the energy storage monitoring background equipment judge the charging and discharging requirements in real time, and control the charging and discharging of the energy storage device. When the load of the grid is high, it can stably provide extra power for the grid to ensure power supply and safe operation of the grid; when the load of the grid is low, it will automatically charge, complete the power reserve, and make full use of the remaining power of the grid, which is energy-saving, environmentally friendly, stable and reliable.

Description

Energy storage power supply system and energy storage power supply box

technical field

The present application relates to the field of electric power technology, in particular to an energy storage power supply system and an energy storage power supply box.

Background technique

With the development of the economy and the improvement of people's material living standards, the electricity load of the power grid is also gradually increasing. In winter and summer, because the heating and cooling needs of residents are concentrated in time periods, the daily electricity load fluctuates greatly. In order to ensure the power supply of residents as much as possible during the peak period of electricity load, traditional technology adds wind power, solar energy and other renewable energy auxiliary power supply to share the power supply load of distribution stations.

However, during the implementation process, the inventors found that there are at least the following problems in the traditional technology: wind power, solar energy and other renewable energy sources are random and intermittent, and it is difficult to provide stable matching auxiliary power for the grid during the peak period of power load. When the supply of renewable energy is too small, it will lead to insufficient supply of electricity for residents; when the supply of renewable energy is too large, the security of the power grid system may be affected, and it will also cause energy waste.

Contents of the invention

Based on this, it is necessary to provide an energy storage power supply system and an energy storage power supply box for the above technical problems.

On the one hand, an embodiment of the present invention provides an energy storage power supply system, including: an energy storage device, an energy storage management device, a bidirectional converter device, an energy storage monitoring terminal, and an energy storage monitoring background device installed in a power grid control center;

The DC terminal of the energy storage device is electrically connected to the bidirectional converter device, the AC terminal of the bidirectional converter device is used to connect to the power grid, the energy storage device is electrically connected to the energy storage management device, and the energy storage monitoring terminal is connected to the energy storage management device and the bidirectional converter respectively. Communication connection between converter device and energy storage monitoring background equipment;

The energy storage management device is used to monitor the operating status of the energy storage device, send the energy storage status information to the energy storage monitoring terminal, and receive charging and discharging instructions from the energy storage monitoring terminal, and control the charging and discharging of the energy storage device; the energy storage status information is marked The operating status of the energy storage device;

The energy storage monitoring terminal is used to forward the received commutation status information and energy storage status information to the energy storage monitoring background equipment, receive charging and discharging information from the energy storage monitoring background equipment, and send charging and discharging instructions to the storage equipment according to the charging and discharging information. The terminal can be monitored; the commutation status information indicates the running status of the bidirectional converter device.

In one of the embodiments, a temperature control device is also included, and the temperature control device is used to detect the temperature of the energy storage device and control the temperature of the energy storage device within a certain range.

In one embodiment, the temperature control device includes a temperature detection module and a fire extinguishing device, and the temperature control detection module is connected to the fire extinguishing device for activating the fire extinguishing device when the temperature of the energy storage device is higher than a threshold.

In one embodiment, the energy storage device includes a plurality of battery packs connected in parallel, and the battery packs are electrically connected to the DC terminal of the bidirectional converter device after being connected in parallel.

In one of the embodiments, it further includes a DC converging device, one end of the DC converging device is electrically connected to each battery pack, and the other end is electrically connected to the DC terminal of the bidirectional converter device.

In one embodiment, the battery pack includes a plurality of iron phosphate cells connected in series.

In one of the embodiments, an insulation detection device is further included, and the insulation detection device is electrically connected to the energy storage device and the energy storage management device respectively.

In one of the embodiments, the energy storage monitoring terminal and the energy storage background equipment are connected through wireless public network communication; the energy storage monitoring terminal is respectively connected to the energy storage management device and the bidirectional converter device through Ethernet or LAN bus.

In one of the embodiments, the energy storage state information includes remaining power and first state information; the first state information indicates that the energy storage device is in a normal or abnormal state;

The energy storage monitoring background equipment is used to obtain the current grid load, determine the charging and discharging information according to the current grid load, remaining power, first state information and commutation state information, and send it to the energy storage monitoring terminal.

On the other hand, an embodiment of the present invention also provides an energy storage power supply box, including a box body and the above-mentioned energy storage power supply system, and the energy storage power supply system is arranged in the box body.

The energy storage power supply system and the energy storage power supply box above report energy storage status information and commutation status information through the energy storage management device and the bidirectional converter device, and the energy storage monitoring terminal and the energy storage monitoring background equipment judge the charging and discharging requirements in real time, Control the charge and discharge of the energy storage device. When the load of the grid is high, it can stably provide extra power for the grid to ensure power supply and safe operation of the grid; when the load of the grid is low, it will automatically charge, complete the power reserve, and make full use of the remaining power of the grid, which is energy-saving, environmentally friendly, stable and reliable.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent by a more particular description of preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals designate the same parts throughout the drawings, and the drawings are not intentionally scaled to actual size and the emphasis is on illustrating the gist of the present invention.

Fig. 1 is a schematic structural diagram of an energy storage power supply system in an embodiment;

Fig. 2 is a schematic structural diagram of an energy storage power supply system in another embodiment;

Fig. 3 is a schematic structural diagram of an energy storage power supply system in yet another embodiment;

Fig. 4 is a schematic circuit diagram of an energy storage power supply system in an embodiment;

Fig. 5 is a schematic circuit diagram of the embodiment shown in Fig. 4 connected to the power grid.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to and integrally integrated with the other element, or there may be an intervening element at the same time. The terms "mounted", "one end", "the other end" and similar expressions are used herein for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In one embodiment, as shown in Figure 1, an energy storage power supply system is provided, including: an energy storage device 10, an energy storage management device 20, a bidirectional converter device 30, an energy storage monitoring terminal 40, and The central energy storage monitors the background equipment 50 .

The DC terminal of the energy storage device 10 is electrically connected to the bidirectional converter device 30, the AC terminal of the bidirectional converter device 30 is used to connect to the power grid, the energy storage device 10 is electrically connected to the energy storage management device 20, and the energy storage monitoring terminal 40 is connected to the power grid respectively. The energy storage management device 20 , the bidirectional converter device 30 and the energy storage monitoring background device 50 are connected in communication.

The energy storage management device 20 is used to monitor the operating status of the energy storage device 10, send the energy storage status information to the energy storage monitoring terminal 40, and receive charging and discharging instructions from the energy storage monitoring terminal 40, so as to control the charging and discharging of the energy storage device 10; The energy storage status information indicates the running status of the energy storage device 10 .

The energy storage monitoring terminal 40 is used to forward the received commutation status information and energy storage status information to the energy storage monitoring background device 50, receive charging and discharging information from the energy storage monitoring background device 50, and send charging and discharging information according to the charging and discharging information. The command is sent to the energy storage monitoring terminal 40; the commutation status information indicates the running status of the bidirectional converter device 30.

Specifically, the energy storage management device 20 monitors the operating status of the energy storage device 10 (such as charging and discharging status, remaining power, whether it is faulty, etc.) and reports the energy storage status information to the energy storage monitoring terminal 40 . The bidirectional commutation device 30 can commutate bidirectionally, converting direct current into alternating current or converting alternating current into direct current. The monitoring terminal of the bidirectional converter device 30 is connected to the energy storage monitoring terminal 40 to report commutation status information of the bidirectional converter device 30 , such as normal and abnormal.

When the power grid is at a peak load, the energy storage monitoring background device 50 sends discharge information according to the energy storage status information and the commutation status information, receives and identifies the discharge information through the energy storage monitoring terminal 40, and issues a discharge command to the energy storage management device 20, The energy storage management device 20 controls the discharge of the energy storage device 10, and the bidirectional converter device 30 converts the direct current output by the energy storage device 10 into an alternating current output value in the power grid to supply power to the load.

When the power grid is not in peak load, the energy storage monitoring background device 50 sends charging information according to the energy storage status information and the commutation status information, receives and identifies the charging information through the energy storage monitoring terminal 40, and sends a charging command to the energy storage management device 20, The energy storage management device 20 controls the charging of the energy storage device 10 , and the bidirectional converter device 30 converts the AC power of the grid into a DC power input to the energy storage device 10 to charge the energy storage device 10 .

Wherein, the bidirectional converter device 30 may be a bidirectional converter PCS.

The above-mentioned energy storage and power supply system can stably provide additional power to the grid when the load on the grid is high, ensuring power supply and safe operation of the grid; when the load on the grid is low, it will automatically charge to complete the power reserve and make full use of the remaining power of the grid, saving energy and protecting the environment ,Stable and reliable.

In one embodiment, the energy storage state information includes remaining power and first state information; the first state information indicates that the energy storage device 10 is in a normal or abnormal state.

The energy storage monitoring background device 50 is used to acquire the current grid load, determine the charging and discharging information according to the current grid load, remaining power, first state information and commutation state information, and send it to the energy storage monitoring terminal 40 .

Specifically, the energy storage monitoring background device 50 may be a grid master control server, and the energy storage monitoring background device 50 will carry out the determination process of charging and discharging the energy storage device 10, including: obtaining the current grid load, energy storage status information and commutation The state information determines charging information or discharging information according to the current grid load, remaining power, first state information and commutation state information, and sends it to the energy storage monitoring terminal 40 . The energy storage monitoring terminal 40 receives charging information or discharging information, identifies and converts it into a charging command or a discharging command and sends it to the energy storage management device 20 . The energy storage management device 20 receives the charging command or the discharging command, and controls the charging or discharging of the energy storage device 10 . Wherein, the commutation status information indicates whether the bidirectional converter is running normally.

Further, when the energy storage monitoring background device 50 makes the following judgments:

When the current grid load is greater than the peak load threshold, the first state information is normal operation, the remaining power is greater than the discharge threshold, and the commutation state information is normal operation, the discharge information is sent to the energy storage monitoring terminal 40 .

When the current grid load is less than the average load threshold, the first state information is normal operation, the remaining power is less than the full power threshold, and the commutation state information is normal operation, the charging information is sent to the energy storage monitoring terminal 40 .

Wherein, the peak load threshold and the average load threshold are preset values, which are preset by the electric power engineer according to the statistical data of the power supply load. The peak load threshold is greater than the average load threshold. The full charge threshold is the power value when the energy storage device 10 is fully charged.

In one embodiment, the determination process in the energy storage monitoring background device 50 includes:

During the preset time period at night, if the remaining power is less than the full charge threshold, the charging information is sent to the energy storage monitoring terminal 40 . The energy storage device 10 is automatically charged during the valley period of the electricity load at night. The preset time period at night can be set according to experience, such as 22:00-4:00.

In one embodiment, a temperature control device 60 is also included, and the temperature control device 60 is used to detect the temperature of the energy storage device 10 and control the temperature of the energy storage device 10 within a certain range. The temperature control device 60 ensures that the energy storage device 10 works at a safe temperature, reducing loss or potential safety hazards of the energy storage device 10 due to high temperature.

Further, in one embodiment, as shown in FIG. 2 , the temperature control device 60 includes a temperature detection module 61 and a fire extinguishing device 62, and the temperature control detection module 61 is connected to the fire extinguishing device 62 for use when the temperature of the energy storage device 10 is higher than The fire extinguishing device 62 is activated at the threshold.

In one embodiment, the temperature detection module is powered by the energy storage device 10, and the energy storage device 10 is connected to the temperature detection module through a DC/AC converter to provide AC power for the temperature detection module.

In one embodiment, the energy storage device 10 includes a plurality of battery packs connected in series. In another embodiment, the energy storage device 10 includes a plurality of battery packs connected in parallel, and the battery packs are electrically connected to the DC terminal of the bidirectional converter device 30 after being connected in parallel. Compared with battery packs connected in series, the parallel connection of battery packs can reduce the abnormality of the energy storage device 10 caused by the failure of individual batteries, and the failure of one of the batteries will not affect the operation of other battery packs. Preferably, a battery pack includes a plurality of iron phosphate batteries connected in series.

Wherein, the energy storage management device 20 may be a battery management system BMS, which is composed of a plurality of detection modules and a main control module CCU. Each detection module is electrically connected to the main control module CCU. Each detection module is arranged on each battery pack to detect the state of the battery, and the main control module CCU receives the detection results of each detection module, and obtains energy storage state information after processing. The energy storage module provides 12V or 24V DC power supply to the main control module CCU through the DC/DC converter.

In one embodiment, as shown in FIG. 3 , a DC bus device 70 is further included. One end of the DC bus device 70 is electrically connected to each battery pack, and the other end is electrically connected to the DC terminal of the bidirectional converter device 30 .

In one embodiment, an insulation detection device is also included. The insulation detection device is electrically connected to the energy storage device 10 and the energy storage management device 20 respectively, and is used to detect whether the insulation protection of the energy storage device 10 and the energy storage management device 20 is normal. Specifically, the insulation detection device may be powered by a DC power supply provided by the energy storage module through a DCDC converter.

In one embodiment, the energy storage monitoring terminal 40 and the energy storage background equipment are connected through wireless public network communication; the energy storage monitoring terminal 40 is connected to the energy storage management device 20 and the bidirectional converter device 30 through Ethernet or LAN bus respectively. Specifically, wireless public network communication includes but is not limited to wireless communication of 2G, 3G, 4G, and 5G standards.

On the other hand, an embodiment of the present invention also provides an energy storage power supply box, including a box body and the above-mentioned energy storage power supply system, and the energy storage power supply system is arranged in the box body. Wherein, the box body may be a container. The energy storage and power supply box can be mounted on the means of transportation, and the mobile one can provide additional power supply for the grid, which is more flexible and convenient, and easy to deploy and dispatch.

In a specific embodiment, a 1MWh energy storage and power supply box is provided. As shown in FIGS. Lithium batteries are connected in series, and the battery management system BMS is responsible for the management of the battery pack. 14 battery packs are installed on two rows of battery racks, which are arranged on both sides of the container. The positive poles of the 14 battery packs are connected in parallel to the DC positive terminal of the 250W bidirectional converter, and the negative poles of the 14 battery packs are connected in parallel to the DC negative terminal of the 250W bidirectional converter. The AC end of the 250W bidirectional converter is divided into three electrical interfaces connected to the grid-connected power distribution cabinet, which are connected to the grid through the grid-connected power distribution cabinet.

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

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a kind of energy storage for power supply system characterized by comprising energy storage device, energy storage managing device, two-way current converter, storage Energy monitor terminal and the energy storage monitoring background devices that grid control centre is set；

The electrical connection of the DC terminal of the energy storage device and the two-way current converter, the exchange end of the two-way current converter is used for Access power grid, the energy storage device and the energy storage managing device electrical connection, the energy storage monitor terminal respectively with the energy storage Managing device, the two-way current converter and energy storage monitoring background devices communication connection；

Energy storage state information is sent to described by the energy storage managing device for monitoring the operating status of the energy storage device Energy storage monitor terminal, and charge and discharge instruction is received from the energy storage monitor terminal, control the energy storage device charge and discharge；The storage Energy status information indicates the operating status of the energy storage device；

The energy storage monitor terminal, for received commutation states information and the energy storage state information to be forwarded to the energy storage Background devices are monitored, and receive charge and discharge power information from energy storage monitoring background devices, according to the charge and discharge power information, send institute Charge and discharge are stated to instruct to the energy storage monitor terminal；The commutation states information indicates the operation shape of the two-way current converter State.

2. energy storage for power supply system according to claim 1, which is characterized in that it further include temperature control device, the temperature control device For detecting the temperature of the energy storage device, and control the temperature of the energy storage device in a certain range.

3. energy storage for power supply system according to claim 2, which is characterized in that the temperature control device includes temperature detecting module And extinguishing device, the temperature control detection module connect the extinguishing device, are higher than threshold value for the temperature when the energy storage device Shi Qidong extinguishing device.

4. energy storage for power supply system according to claim 3, which is characterized in that the energy storage device includes the electricity of multiple parallel connections Pond group is electrically connected after the battery pack is in parallel with the DC terminal of the two-way current converter.

5. energy storage for power supply system according to claim 4, which is characterized in that further include direct current collector-shoe gear, the direct current Collector-shoe gear one end is electrically connected with each battery pack, and the other end is electrically connected with the DC terminal of the two-way current converter.

6. energy storage for power supply system according to claim 5, which is characterized in that the battery pack includes multiple concatenated phosphoric acid Iron cell.

7. energy storage for power supply system according to claim 6, which is characterized in that it further include insulation detection device, the insulation Detection device is electrically connected the energy storage device and energy storage managing device electrical connection.

8. energy storage for power supply system according to claim 7, which is characterized in that after the energy storage monitor terminal and the energy storage Platform equipment is communicated to connect by wireless public network；The energy storage monitor terminal passes through Ethernet respectively or LAN bus connects the storage It can managing device and the two-way current converter.

9. energy storage for power supply system according to claim 1, which is characterized in that the energy storage state information includes remaining electricity Amount, first state information；The first state information indicates that the energy storage device is in normal or abnormal state；

The energy storage monitoring background devices are used for, and obtain current electric grid load, according to the current electric grid load, the remaining electricity Amount, first state information and commutation states information, determine the charge and discharge power information, and be sent to the energy storage monitor terminal.

10. a kind of energy storage for power supply case, which is characterized in that supplied including cabinet and energy storage as claimed in any one of claims 1 to 9 Electric system, the energy storage for power supply system are set in the cabinet.