CN-122026430-A - Optical storage power supply control system and method

CN122026430ACN 122026430 ACN122026430 ACN 122026430ACN-122026430-A

Abstract

The invention relates to the technical field of new energy power, in particular to a light storage power supply control system and a light storage power supply control method, wherein the light storage power supply control system is used for supplying power to at least two loads and comprises a photovoltaic power generation unit, an energy storage unit, an energy management system, a power grid bus, light Fu Muxian, a first load branch and a second load branch, wherein a first controllable circuit breaker is connected in series on the first power supply branch, a first backflow prevention device is connected in series on the second power supply branch, a second controllable circuit breaker is connected in series on the third power supply branch, and a second backflow prevention device is connected in series on the fourth power supply branch. The invention aims to provide an optical storage power supply control system and an optical storage power supply control method, which solve the problems of disturbance and protection reliability possibly existing in the prior optical storage power supply system when load grading power supply is switched, and ensure the power quality of non-important load power supply loop switching.

Inventors

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Assignees

深圳市瑞能时代科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (12)

1. The light storage power supply control system is characterized by being used for supplying power to at least two loads, wherein the power supply priority of a first load is higher than the power supply priority of a second load; The first load branch is connected with a first load and comprises a first power supply branch and a second power supply branch which are connected in parallel, wherein a first controllable circuit breaker is connected in series on the first power supply branch, and a first backflow preventing device is connected in series on the second power supply branch; the second load branch is connected with a second load and comprises a third power supply branch and a fourth power supply branch which are connected in parallel, wherein a second controllable circuit breaker is connected in series on the third power supply branch, and a second backflow preventing device is connected in series on the fourth power supply branch; the photovoltaic power generation unit is connected to the photovoltaic bus, and the energy storage unit is connected to the light Fu Muxian through a bidirectional converter; The first power supply branch and the third power supply branch are connected to the photovoltaic bus, and the second power supply branch and the fourth power supply branch are connected to the grid bus; The energy management system is in communication connection with the photovoltaic power generation unit, the energy storage unit, the first controllable circuit breaker, the second controllable circuit breaker, the first anti-countercurrent device and the second anti-countercurrent device.
2. The light-operated power supply control system as set forth in claim 1, wherein said first reverse flow prevention device is electrically connected to said second controllable circuit breaker opening drive via an independent hardware interlock circuit such that said first reverse flow prevention device is capable of directly driving said second controllable circuit breaker opening when reverse flow is detected.
3. The light-storing and power-supplying control system according to claim 1 or 2, further comprising a metering device arranged on the first power supply branch, the second power supply branch, the third power supply branch, the fourth power supply branch, the power supply branch between the photovoltaic power generation unit and the photovoltaic bus, and the power supply branch between the energy storage unit and the photovoltaic bus, wherein the metering device is in communication connection with the energy management system.
4. The light-storing and power-supplying control system according to claim 1 or 2, wherein the light-storing and power-supplying control system is integrated in one grid-connected cabinet or distributed in a plurality of grid-connected cabinets.
5. A control method based on the optical storage power supply control system according to claim 1 or 2, executed by the energy management system, characterized by comprising a basic operation mode and an optimized cooperative mode; the base operating mode includes: S1, a first priority, wherein the generated power of a photovoltaic power generation unit is preferentially used for a first load; S2, a second priority is given to the photovoltaic surplus power after the electricity consumption requirement of the first load is met, and the energy storage unit is charged preferentially; S3, a third priority is given to the second load if residual power is still remained after the energy storage unit is charged, and the power supply to the second load is stopped immediately if the residual power is smaller than or equal to 0; the optimized collaborative mode includes at least one of: When the real-time power of the first load is lower than a set threshold value and the photovoltaic power generation unit has output force, taking a power supply branch of the second load as an energy damper, and maintaining the power detected by the first backflow preventing device to be zero by adjusting the power supply power of the second load; A mode B, when the power quality index of the access point of the first load is monitored to exceed a set limit value, generating and executing an instruction which takes precedence over the operation of the third priority, wherein the instruction at least comprises the opening of a second controllable breaker; and C, when the communication of the energy management system is interrupted, if the generated power of the photovoltaic power generation unit is detected to be larger than the power of the first load, controlling the energy storage unit to stop discharging.
6. The control method according to claim 5, wherein in the basic operation mode, the generated power P0 of the photovoltaic power generation unit and the power P1 of the first load are obtained in real time; in step S1, judging whether the photovoltaic power generation power meets a first load requirement; if P0 is more than or equal to P1, the photovoltaic power generation unit supplies power to the first load, and the step S2 is carried out; If the power shortage of the first load is still insufficient after the discharge of the energy storage unit, the power is supplied to the first load by the power grid bus; In the step S2, when the energy storage unit is chargeable under the condition that P0 is more than or equal to P1, controlling the energy storage unit to charge with power which is not more than (P0-P1), and calculating the remaining power P3 of the charged system; In step S3, it is determined whether the system remaining power P3 is greater than 0; if yes, the second controllable breaker is controlled to be closed, and the power of the system residual power P3 is supplied to a second load; If not, or if the system residual power P3 is not more than 0 in the power supply process, the second controllable breaker is immediately controlled to be opened.
7. The control method according to claim 6, wherein in step S2, if it is detected that the change rate of the generated power of the photovoltaic power generation unit exceeds a positive threshold and the state of charge of the energy storage unit is higher than a set high threshold, step S2 is skipped, and step S3 is performed by making P3=P0-P1.
8. The method of claim 6, wherein the power supplied to the second load in step S3 does not exceed a smaller value of the real-time power P3 and the second load P4.
9. The control method according to claim 6, wherein in step S2, if the energy storage unit is not chargeable or is full, P3=P0-P1 is set.
10. The control method according to claim 5, characterized in that in the basic operation mode: when the first controllable circuit breaker is closed and the second controllable circuit breaker is opened, if the first backflow prevention device monitors backflow, the second controllable circuit breaker is closed, and the second load absorbs backflow power; When the first controllable circuit breaker and the second controllable circuit breaker are both closed, if the first backflow preventing device and/or the second backflow preventing device monitor backflow, the energy management system sequentially controls to reduce the output of the energy storage unit, reduce the output of the photovoltaic power generation unit and disconnect the first controllable circuit breaker and the second controllable circuit breaker according to the backflow information.
11. The control method according to claim 5, wherein in the mode B, the power quality index includes a voltage dip, a voltage surge, or a harmonic content.
12. The control method of claim 5, wherein said method control system returns to said base run mode logic when said power quality indicator returns to normal after said mode B is triggered and executed.

Description

Optical storage power supply control system and method Technical Field The invention relates to the technical field of new energy power, in particular to a light storage power supply control system and a method. Background In the industrial and commercial fields, in order to reduce electricity cost and carbon emission, installation of a photovoltaic, wind power and other distributed new energy power generation system has become a common choice. Under the operation mode of 'residual electricity is not connected to the Internet', namely, the generated energy is completely consumed in situ, and the industrial and commercial photovoltaic system is often configured with energy storage to improve the self-utilization rate. When industrial and commercial users install photovoltaic systems, the constraint of 'residual electricity is not on the internet' is often faced. The existing scheme ensures the power supply of important loads and improves the self-utilization rate by configuring an anti-backflow device and a simple priority strategy. However, these solutions have the obvious disadvantage that, firstly, when the important load is very light or no-load, the light Fu Muxian forms a low-impedance path with the power grid through the closed load switch, which is liable to cause power disturbance and frequent actions of the anti-backflow device. Second, control relies entirely on a central energy management system, which may lose core protection logic once communication is interrupted. Finally, existing schemes only focus on power distribution, and do not utilize load switching capability to improve the power quality of critical bus bars. Therefore, there is a need for an integrated solution that can still operate stably, reliably, and intelligently under complex operating conditions and anomalies. Disclosure of Invention The invention aims to provide an optical storage power supply control system and an optical storage power supply control method, which solve the problems of disturbance and protection reliability possibly existing in the prior optical storage power supply system when load grading power supply is switched, and ensure the power quality of non-important load power supply loop switching. In order to achieve the above purpose, the invention provides an optical storage power supply control system, which is used for supplying power to at least two loads, wherein the power supply priority of a first load is higher than the power supply priority of a second load; The first load branch is connected with a first load and comprises a first power supply branch and a second power supply branch which are connected in parallel, wherein a first controllable circuit breaker is connected in series on the first power supply branch, and a first backflow preventing device is connected in series on the second power supply branch; the second load branch is connected with a second load and comprises a third power supply branch and a fourth power supply branch which are connected in parallel, wherein a second controllable circuit breaker is connected in series on the third power supply branch, and a second backflow preventing device is connected in series on the fourth power supply branch; the photovoltaic power generation unit is connected to the photovoltaic bus, and the energy storage unit is connected to the light Fu Muxian through a bidirectional converter; The first power supply branch and the third power supply branch are connected to the photovoltaic bus, and the second power supply branch and the fourth power supply branch are connected to the grid bus; The energy management system is in communication connection with the photovoltaic power generation unit, the energy storage unit, the first controllable circuit breaker, the second controllable circuit breaker, the first anti-countercurrent device and the second anti-countercurrent device. Preferably, the reverse flow alarm signal output end of the first reverse flow preventing device is electrically connected with the opening driving end of the second controllable breaker through an independent hardware interlocking loop, so that the first reverse flow preventing device can directly drive the second controllable breaker to open when reverse flow is detected. Preferably, the system further comprises a metering device arranged on the first power supply branch, the second power supply branch, the third power supply branch, the fourth power supply branch, the power supply branch between the photovoltaic power generation unit and the photovoltaic bus and the power supply branch between the energy storage unit and the photovoltaic bus, and the metering device is in communication connection with the energy management system. Preferably, the optical storage power supply control system is integrated in one grid-connected cabinet or distributed in a plurality of grid-connected cabinets. Based on the light storage power supply control system, the invention also provides a li