A control device and control method for improving power supply reliability of high-proportion new energy storage system
By adopting a control system with automatic monitoring, reliable input and timely warning in the new energy energy storage system, combined with the dual bus wiring device and the accurate statistical method of dispatchable capacity, the problem of difficult to ensure the power supply reliability of the new energy energy storage system is solved, and the stable and accurate power output of the system is achieved.
Patent Information
- Application Number
- CN202510032692.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-04-01
AI Technical Summary
The power supply reliability of new energy energy storage systems is difficult to ensure, mainly because it is difficult to accurately count the residual power and the time it can be accessed for energy storage in wind and light storage scenarios. The inconsistent battery SOC results in the reported capacity that does not match the actual situation, and the changes in discharge power are difficult to continuously and accurately schedule.
The control system with automatic monitoring, reliable turnover and timely warning is adopted, and the new energy energy storage system is realized according to the accurate statistics of the duration and power output of the new energy storage system through the dual bus wiring device and the accurate statistics of the dispatchable capacity.
It greatly improves the power supply reliability of the new energy energy storage system, solves the problem of unreliable power supply and difficult to accurately count, and ensures that the system can output power stably and accurately.
Smart Images
Figure CN119742895A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of new energy power technology, and in particular relates to a control device and a control method for improving the power supply reliability of a high-proportion new energy storage system. Background Art
[0002] New energy power generation is one of the current strategic emerging industries. With the rise of my country's new energy industry, energy storage technology has attracted attention from all parties as an important support and auxiliary technology for new energy power generation. In the new energy storage system, green new energy such as photovoltaic power generation and wind power generation will have a great impact on the stable operation of the power grid due to their inherent randomness and indirectness, and cannot output power stably and reliably. In terms of energy storage, there are problems with the accurate statistics of dispatchable capacity, which makes it difficult to accurately predict and match the demand side of energy storage power supply.
[0003] The main reasons why the reliability of power supply of new energy storage systems is difficult to ensure are: (1) In the wind-solar-storage scenario, when the energy storage is charging, the surplus power of the wind and solar can be connected to the grid, but the remaining power and the duration of access to the grid are difficult to accurately count. (2) The dispatchable capacity is calculated based on the average SOC, but the SOCs of the batteries are inconsistent, and the actual discharge will be limited by the shortcomings, resulting in the reported capacity not being consistent with the actual capacity. (3) Due to the SOC difference, when some batteries stop discharging due to low SOC, the discharge power will change, making it difficult to continuously and accurately dispatch the discharge.
[0004] Therefore, in the prior art, there are problems in the technical field such as unreliable power supply and difficulty in accurate statistics. Summary of the invention
[0005] To solve the above problems, the purpose of the present invention is to disclose a control device and a control method for improving the power supply reliability of a high-proportion new energy storage system, which is achieved by adopting the following technical solutions.
[0006] A control device for improving the power supply reliability of a high-proportion new energy storage system adopts a control system for automatic monitoring, reliable switching and timely warning of the new energy storage system; the characteristics are: the control system can allow the new energy storage system to output electricity according to the accurately counted duration and power, thereby greatly improving the external power supply reliability of the new energy storage system; the control system adopts a double bus wiring device and an accurate counting method for the dispatchable capacity; the double bus wiring device consists of a charging bus, a discharging bus, a first main circuit breaker, a second main circuit breaker, a third main circuit breaker, and a first main circuit breaker. The first conversion circuit breaker, the first second conversion circuit breaker, the second first conversion circuit breaker, the second second conversion circuit breaker, the third first conversion circuit breaker, the third second conversion circuit breaker, the first energy storage inverter, the second energy storage inverter, and the third energy storage inverter are composed; one end of the first conversion circuit breaker of the first circuit is connected to the charging bus, the other end of the first conversion circuit breaker of the first circuit is connected to the first incoming line terminal of the first energy storage inverter, one end of the first second conversion circuit breaker of the first circuit is connected to the discharging bus, the other end of the first second conversion circuit breaker of the first circuit is connected to the second incoming line terminal of the first energy storage inverter; the second One end of the first conversion circuit breaker is connected to the charging bus, the other end of the second first conversion circuit breaker is connected to the first incoming line terminal of the second energy storage converter, one end of the second second conversion circuit breaker is connected to the discharge bus, and the other end of the second second conversion circuit breaker is connected to the second incoming line terminal of the second energy storage converter; one end of the third first conversion circuit breaker is connected to the charging bus, the other end of the third first conversion circuit breaker is connected to the first incoming line terminal of the third energy storage converter, one end of the third second conversion circuit breaker is connected to the discharge bus, and the other end of the third second conversion circuit breaker is connected to the third storage converter. one end of the first main circuit breaker is connected to the outlet terminal of the first energy storage inverter, the other end of the first main circuit breaker is connected to the lead-out terminal of battery 1, one end of the second main circuit breaker is connected to the outlet terminal of the second energy storage inverter, the other end of the second main circuit breaker is connected to the lead-out terminal of battery 2, one end of the third main circuit breaker is connected to the outlet terminal of the third energy storage inverter, the other end of the third main circuit breaker is connected to the lead-out terminal of battery 3; the two input states of each energy storage inverter are mutually exclusive and both adopt the AC side parallel mode, and the charging bus and the discharging bus are not connected.
[0007] A control method adopts the above-mentioned control device for improving the power supply reliability of a high-proportion new energy storage system, characterized in that: the battery family, namely battery 1, battery 2, and battery 3 can be switched independently of each other, and charging or discharging can be independently controlled.
[0008] The present application has the following major beneficial technical effects: it uses a dual bus connection method for charging and discharging and an accurate statistical method for dispatchable capacity; and forms a control system for automatic monitoring, reliable switching and timely warning of new energy storage systems. The system enables the new energy storage system to output electricity according to accurately statistical duration and power, solving the problems of unreliable power supply and difficulty in accurate statistics in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the principle of the main parts of the device of the present invention. DETAILED DESCRIPTION
[0010] In order to enable those skilled in the art to better understand and implement this patent, the marks in the drawings are now described in detail in conjunction with the drawings in the specification.
[0011] In the figure: hlp1—charging bus, hlp2—discharging bus, QF1—first main circuit breaker, QF2—second main circuit breaker, QF3—third main circuit breaker, QF11—first first conversion circuit breaker, QF12—first second conversion circuit breaker, QF21—second first conversion circuit breaker, QF22—second second conversion circuit breaker, QF31—third first conversion circuit breaker, QF32—third second conversion circuit breaker, PCS1—first energy storage inverter, PCS2—second energy storage inverter, PCS3—third energy storage inverter.
[0012] Implementation example: see Figure 1, a control device for improving the power supply reliability of a high-proportion new energy storage system, adopts a control system for automatic monitoring, reliable switching and timely warning of the new energy storage system; it is characterized in that: the control system can allow the new energy storage system to output electricity according to the accurately counted duration and power, thereby greatly improving the external power supply reliability of the new energy storage system; the control system adopts a double bus wiring device and an accurate statistical method for dispatchable capacity; the double bus wiring device consists of a charging bus hlp1, a discharging bus hlp2, a first main circuit breaker QF1, a second main circuit breaker QF2, a third main circuit breaker QF3, a first first conversion circuit breaker QF11, a first second conversion circuit breaker QF12, a second The first circuit breaker QF21, the second circuit breaker QF22, the third circuit breaker QF31, the third circuit breaker QF32, the first energy storage converter PCS1, the second energy storage converter PCS2, and the third energy storage converter PCS3 are composed of a first conversion circuit breaker QF11 of the first circuit, one end of the first conversion circuit breaker QF11 is connected to the charging bus hlp1, the other end of the first conversion circuit breaker QF11 is connected to the first incoming line terminal of the first energy storage converter PCS1, one end of the first second conversion circuit breaker QF12 is connected to the discharging bus hlp2, and the other end of the first second conversion circuit breaker QF12 is connected to the second incoming line terminal of the first energy storage converter PCS1; the first conversion circuit breaker QF One end of the first conversion circuit breaker QF21 of the second circuit is connected to the charging bus hlp1, the other end of the first conversion circuit breaker QF21 of the second circuit is connected to the first incoming line terminal of the second energy storage converter PCS2, one end of the second second conversion circuit breaker QF22 of the second circuit is connected to the discharge bus hlp2, and the other end of the second second conversion circuit breaker QF22 of the second circuit is connected to the second incoming line terminal of the second energy storage converter PCS2; one end of the first conversion circuit breaker QF31 of the third circuit is connected to the charging bus hlp1, the other end of the first conversion circuit breaker QF31 of the third circuit is connected to the first incoming line terminal of the third energy storage converter PCS3, one end of the second conversion circuit breaker QF23 of the third circuit is connected to the discharge bus hlp2, and the other end of the second conversion circuit breaker QF23 of the third circuit is connected to the discharge bus hlp2. Connected to the second incoming terminal of the third energy storage inverter PCS3; one end of the first main circuit breaker QF1 is connected to the outgoing terminal of the first energy storage inverter PCS1, and the other end of the first main circuit breaker QF1 is connected to the lead-out terminal of battery 1, one end of the second main circuit breaker QF2 is connected to the outgoing terminal of the second energy storage inverter PCS2, and the other end of the second main circuit breaker QF2 is connected to the lead-out terminal of battery 2, one end of the third main circuit breaker QF3 is connected to the outgoing terminal of the third energy storage inverter PCS3, and the other end of the third main circuit breaker QF3 is connected to the lead-out terminal of battery 3; the two input states of each energy storage inverter are mutually exclusive and both adopt the AC side parallel mode, and the charging bus hlp1 and the discharging bus hlp2 are not connected.
[0013] A control method adopts the above-mentioned control device for improving the power supply reliability of a high-proportion new energy storage system, characterized in that: the battery family, namely battery 1, battery 2, and battery 3 can be switched independently of each other, and charging or discharging can be independently controlled.
[0014] The control method described above is characterized in that: only the capacity of fully charged battery clusters can be counted into the dispatchable capacity and can be put into discharge.
[0015] The control method described above is characterized in that: when charging is required, QF11, QF21, and QF31 are closed to connect the charging current, QF12, QF22, and QF32 are disconnected, and the system real-time statistics of charging power, voltage, current, speed, etc.
[0016] The control method described above is characterized in that: when a battery is fully charged, such as battery 1, QF11 is disconnected from the charging bus and enters a standby state. The system counts the capacity of all batteries in the standby state in real time. At this time, the capacity can be accurately counted and effectively counted.
[0017] The control method described above is characterized in that: the system receives the switching command from the dispatching control center, matches the batteries in standby state according to the required power and duration, connects the batteries that need to be put into use to the discharge bus, for example, if battery 2 and battery 3 need to be put into use, then QF22 and QF32 are closed and discharge to the main grid. At this time, the system can ensure stable discharge power and discharge duration.
[0018] The control method described above is characterized in that: when the battery capacity reaches a lower limit of 10% (settable), battery 2 and battery 3 are automatically disconnected from the discharge bus and enter a charging state; when charging is required, QF is connected to the charging bus to start charging.
[0019] The dual bus wiring method and the accurate statistical method of dispatchable capacity in this application are innovative in that the charging bus and the discharging bus are designed independently. The PCS is connected to the two buses in two ways. The two states are mutually exclusive and the AC side is connected in parallel. When the battery SOC is low, the charging bus will be switched in for charging; after it is fully charged, the charging bus will be switched out to keep it in a standby state; when it needs to be discharged, the discharge bus will be switched in for discharge; after the discharge is completed, the discharge bus will be switched out to keep it in a standby state. The system only counts the capacity of batteries that are fully charged and in a standby state. This capacity is accurate and reliable, and can reliably provide the power and duration of power supply, thereby ensuring the reliability of power supply.
[0020] The present invention proposes a control method for greatly improving the power supply reliability of a high-proportion renewable energy storage system, which uses a dual bus connection method for charging and discharging and an accurate statistical method for dispatchable capacity; a control system is designed for automatic monitoring, reliable switching and timely warning of the renewable energy storage system, which enables the renewable energy storage system to output electricity according to the accurately statistical duration and power.
[0021] The present application has the following major beneficial technical effects: it uses a dual bus connection method for charging and discharging and an accurate statistical method for dispatchable capacity; and forms a control system for automatic monitoring, reliable switching and timely warning of new energy storage systems. The system enables the new energy storage system to output electricity according to accurately statistical duration and power, solving the problems of unreliable power supply and difficulty in accurate statistics in the prior art.
[0022] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.
Claims
1. A control device for improving the power supply reliability of a high-proportion new energy storage system, which adopts a control system for automatic monitoring, reliable switching and timely warning of the new energy storage system; it is characterized by: The control system enables the new energy storage system to output electricity according to the accurately counted duration and power, thereby greatly improving the external power supply reliability of the new energy storage system; the control system adopts a double bus wiring device and an accurate counting method of the dispatchable capacity; the double bus wiring device consists of a charging bus (hlp1), a discharging bus (hlp2), a first main circuit breaker (QF1), a second main circuit breaker (QF2), a third main circuit breaker (QF3), a first first conversion circuit breaker (QF11), the first-way second conversion circuit breaker (QF12), the second-way first conversion circuit breaker (QF21), the second-way second conversion circuit breaker (QF22), the third-way first conversion circuit breaker (QF31), the third-way second conversion circuit breaker (QF32), the first energy storage converter (PCS1), the second energy storage converter (PCS2), and the third energy storage converter (PCS3); one end of the first-way first conversion circuit breaker (QF11) is connected to the charging bus (hlp1), The other end of the first circuit first conversion circuit breaker (QF11) is connected to the first incoming line terminal of the first energy storage converter (PCS1), one end of the first circuit second conversion circuit breaker (QF12) is connected to the discharge bus (hlp2), and the other end of the first circuit second conversion circuit breaker (QF12) is connected to the second incoming line terminal of the first energy storage converter (PCS1); one end of the second circuit first conversion circuit breaker (QF21) is connected to the charging bus (hlp1), the other end of the second circuit first conversion circuit breaker (QF21) is connected to the first incoming line terminal of the second energy storage converter (PCS2), one end of the second circuit second conversion circuit breaker (QF22) is connected to the discharge bus (hlp2), and the other end of the second circuit second conversion circuit breaker (QF22) is connected to the second incoming line terminal of the second energy storage converter (PCS2); one end of the third circuit first conversion circuit breaker (QF31) is connected to the charging bus (hlp1), and the third circuit second conversion circuit breaker (QF32) is connected to the discharge bus (hlp2). The other end of the first conversion circuit breaker (QF31) is connected to the first incoming line terminal of the third energy storage converter (PCS3); one end of the third second conversion circuit breaker (QF23) is connected to the discharge bus (hlp2); the other end of the third second conversion circuit breaker (QF23) is connected to the second incoming line terminal of the third energy storage converter (PCS3); one end of the first main circuit breaker (QF1) is connected to the outgoing line terminal of the first energy storage converter (PCS1); The other end of the circuit breaker (QF1) is connected to the lead-out terminal of the battery (1), one end of the second main circuit breaker (QF2) is connected to the lead-out terminal of the second energy storage converter (PCS2), the other end of the second main circuit breaker (QF2) is connected to the lead-out terminal of the battery (2), one end of the third main circuit breaker (QF3) is connected to the lead-out terminal of the third energy storage converter (PCS3), and the other end of the third main circuit breaker (QF3) is connected to the lead-out terminal of the battery (3);The two input states of each energy storage converter are mutually exclusive and both adopt the AC side parallel connection mode. The charging bus (hlp1) and the discharging bus (hlp2) are not connected. ; 2. A control method, using the control device for improving the power supply reliability of a high-proportion new energy storage system according to claim 1, characterized in that: The battery groups can be switched independently of each other and can control charging or discharging independently.
3. The control method according to claim 2, characterized in that: Only fully charged battery clusters can have their capacity counted into dispatchable capacity and can be put into discharge.
4. The control method according to claim 3, characterized in that: When charging is required, the first conversion circuit breaker (QF11) of the first route, the first conversion circuit breaker (QF21) of the second route, and the first conversion circuit breaker (QF31) of the third route are closed to connect the charging current, and the second conversion circuit breaker (QF12) of the first route, the second conversion circuit breaker (QF22) of the second route, and the second conversion circuit breaker (QF32) of the third route are disconnected, and the system counts the charging power, voltage, current, and speed in real time.
5. The control method according to claim 4, characterized in that: When a battery is fully charged, it is disconnected from the corresponding charging bus and enters the standby state. The system counts the capacity of all batteries in the standby state in real time. The capacity at this time can be accurately and effectively counted.
6. The control method according to claim 5, characterized in that: The system receives switching instructions from the dispatching control center, matches the batteries in standby state according to the required power and duration, and connects the batteries that need to be put into use to the discharge bus. At this time, the system can ensure stable discharge power and discharge duration.
7. The control method according to claim 6, characterized in that: When the battery capacity reaches the set lower limit, it is automatically disconnected from the discharge bus and enters the charging state; when charging is needed, it is connected to the charging bus and charging begins.