CN-122026593-A - Box transformer UPS continuous power supply system and control method

CN122026593ACN 122026593 ACN122026593 ACN 122026593ACN-122026593-A

Abstract

The invention belongs to the technical field of box transformer UPS power supply, and relates to a box transformer UPS continuous power supply system and a control method, wherein the box transformer UPS continuous power supply system comprises the steps of obtaining photovoltaic power generation power, mains voltage and storage battery pack charge state, and obtaining comprehensive grading values according to the photovoltaic power generation power, the mains voltage and the storage battery pack charge state; based on the comprehensive grading value and different preset grading thresholds, switching different energy sources; and when different energy sources are switched, smooth and seamless switching is performed through continuously changing switching proportion. According to the invention, different energy sources are switched according to the priority through the comprehensive grading value and the preset different grading threshold values, and smooth and seamless switching is performed through the continuously-changing switching proportion, so that the problem that the conventional box-type UPS lacks special control logic for continuously supplying power of different energy sources and cannot realize smooth and seamless switching of different energy sources is solved.

Inventors

GAO LEI
WANG YUPENG
ZHENG YONGKUI
WU ZHIPENG
NIU CHAO
SONG GUOXIN
SUN YUE
YANG XIAOLONG
Peng Suolong
ZHAO HUI

Assignees

华能呼和浩特风力发电有限公司

Dates

Publication Date: 20260512
Application Date: 20260312

Claims (10)

1. The utility model provides a case becomes UPS continuous power supply control method which characterized in that includes: Acquiring photovoltaic power generation power, mains voltage and storage battery pack charge state, and obtaining comprehensive grading values according to the photovoltaic power generation power, the mains voltage and the storage battery pack charge state; Based on the comprehensive grading value and different preset grading thresholds, switching different energy sources; And when different energy sources are switched, smooth and seamless switching is performed through continuously changing switching proportion.
2. The continuous power supply control method for a box transformer UPS according to claim 1, wherein the calculation formula of the comprehensive grading value is: , Wherein, the The power is photovoltaic power; the photovoltaic rated power generation power is preset; Is the mains voltage; Is a preset rated voltage of the mains supply; the maximum deviation of the preset voltage; is the state of charge of the battery pack; the weight of the photovoltaic energy source is preset; the weight of the commercial power source is preset; The energy storage weight is preset; 。
3. The method for continuously controlling power supply of a box transformer UPS according to claim 1, wherein the performing different energy source switching based on the integrated score value and the preset different score threshold value includes: The scoring threshold comprises a first scoring threshold and a second scoring threshold, wherein the first scoring threshold is larger than the second scoring threshold; And judging whether the comprehensive score value is smaller than the first score threshold value, if so, continuing to adopt the photovoltaic energy source, and if so, judging whether the comprehensive score value is smaller than the second score threshold value, and if not, switching the photovoltaic energy source into the commercial energy source, and if so, switching the commercial energy source into the electric storage energy source.
4. The method for continuously controlling power supplied to a box-type UPS according to claim 1, wherein the smooth seamless switching by continuously changing a switching ratio includes: Acquiring current switching time, and acquiring switching proportion based on the current switching time and preset total switching time; And according to the switching proportion, controlling the power of the exiting energy and the power of the input energy to perform smooth and seamless switching through a proportion control valve until the input energy is completely adopted for power supply.
5. The continuous power supply control method for a box-type transformer UPS of claim 4, wherein the calculation formula of the switching ratio is: , The calculation formula of the power of the exiting energy is as follows: , the calculation formula of the power input into the energy source is as follows: , And is also provided with Wherein, the T is the current switching time, the range (0, T) of the current switching time, and T is the preset total switching time; Power for exit energy a; To input the power of the energy source B.
6. The box-type UPS continuous power supply system is characterized by being used for realizing the box-type UPS continuous power supply control method according to any one of claims 1-5, and comprises a solar photovoltaic panel assembly, an MPPT photovoltaic controller, an intelligent switching module, a communication module, a rectifying module, an inversion module, a proportional control valve, a storage battery pack and a commercial power; the solar photovoltaic panel assembly is connected with the MPPT photovoltaic controller, the commercial power and the storage battery pack are connected with the proportional control valve, the proportional control valve is connected with the rectifying module, the rectifying module is connected with the inversion module, and the communication module is connected with the MPPT photovoltaic controller, the commercial power, the storage battery pack, the intelligent switching module and the proportional control valve respectively.
7. The continuous power supply system of the box transformer UPS of claim 6, wherein the solar photovoltaic panel assembly is a flexible monocrystalline silicon photovoltaic assembly, and the inclination angle of the photovoltaic panel of the flexible monocrystalline silicon photovoltaic assembly is 0-10 degrees.
8. The continuous power supply system of a box-section UPS of claim 6, further comprising a battery online compensation module, the battery online compensation module comprising: the storage battery comprises a current limiting resistor, a self-recovery fuse, an LED state indicator lamp, an anti-reflection diode and a TVS transient suppression diode which are sequentially connected, wherein the anode of the storage battery is connected with the cathode of the anti-reflection diode and the anode of the TVS transient suppression diode respectively, and the cathode of the storage battery is connected with the cathode of the TVS transient suppression diode.
9. The continuous power supply system of the box transformer UPS of claim 6, further comprising a BMS slave control module for dynamically adjusting a charging limit value according to the health degree of the battery, wherein the BMS slave control module is respectively connected with the MPPT photovoltaic controller, the mains supply, the communication module and the storage battery.
10. The continuous power supply system of a box-type transformer UPS of claim 9, wherein the calculation formula of the charging current limit value is: , Wherein, the The charging current limit value; the method comprises the steps of setting a preset rated maximum charging current; Is the battery health; Is a preset safety coefficient.

Description

Box transformer UPS continuous power supply system and control method Technical Field The invention relates to the technical field of box-type UPS power supply, and particularly discloses a box-type UPS continuous power supply system and a control method. Background The box-type transformer (namely box transformer) is core node equipment of a photovoltaic power station, a wind power plant and an urban power distribution network, and a measurement and control device, a communication terminal and a remote execution mechanism which are arranged in the box-type transformer are all dependent on a UPS system to provide backup power supply guarantee. The UPS system is usually composed of a rectifying module, an inversion module and a storage battery pack, is powered by mains supply and is used for floating charging the storage battery in normal operation, and is automatically switched to the storage battery pack for supplying power when the mains supply is in power failure, so that continuous operation of a load is maintained. Although the design life of the storage battery is 3-5 years, the practical life is only 2-3 years, and as the use frequency of the storage battery increases, irreversible performance degradation of the storage battery generally occurs, so that the backup power supply is insufficient, the off-line rate of equipment is obviously increased, the storage battery is replaced generally, the cost of replacing the storage battery is high, power failure construction is needed, the power generation income is influenced, and the photovoltaic energy source and the UPS system are generally used for simply and parallelly supplying power continuously to improve the endurance capacity and prolong the service life of the storage battery under the condition, but the special control logic of different energy sources is lacked, and smooth and seamless switching of different energy sources cannot be realized. Disclosure of Invention The invention aims to provide a continuous power supply system and a control method for a box-type transformer UPS, which solve the problems that the existing box-type transformer UPS lacks special control logic of different energy sources and cannot realize smooth and seamless switching of the different energy sources. The specific scheme of the invention is as follows: A box-type UPS continuous power supply control method comprises the following steps: Acquiring photovoltaic power generation power, mains voltage and storage battery pack charge state, and obtaining comprehensive grading values according to the photovoltaic power generation power, the mains voltage and the storage battery pack charge state; Based on the comprehensive grading value and different preset grading thresholds, switching different energy sources; And when different energy sources are switched, smooth and seamless switching is performed through continuously changing switching proportion. Preferably, the calculation formula of the integrated score value is: , Wherein, the The power is photovoltaic power; the photovoltaic rated power generation power is preset; Is the mains voltage; Is a preset rated voltage of the mains supply; the maximum deviation of the preset voltage; is the state of charge of the battery pack; the weight of the photovoltaic energy source is preset; the weight of the commercial power source is preset; The energy storage weight is preset; 。 preferably, based on the comprehensive score value and different preset score thresholds, performing different energy switching includes: The scoring threshold includes a first scoring threshold and a second scoring threshold, the first scoring threshold being greater than the second scoring threshold; And judging whether the comprehensive score value is smaller than the first score threshold value, if so, continuing to adopt the photovoltaic energy source, if so, judging whether the comprehensive score value is smaller than the second score threshold value and larger than zero, and if so, switching the photovoltaic energy source into the commercial energy source, and if so, switching the commercial energy source into the electric storage energy source. Preferably, the smooth seamless handover is performed by continuously changing the handover proportion, including: Acquiring current switching time, and acquiring switching proportion based on the current switching time and preset total switching time; And according to the switching proportion, controlling the power of the exiting energy and the power of the input energy to perform smooth and seamless switching through a proportion control valve until the input energy is completely adopted for power supply. Preferably, the calculation formula of the switching ratio is: , The calculation formula of the power of the exiting energy is as follows: , the calculation formula of the power input into the energy source is as follows: , And is also provided with Wherein, the T is the current switching time