CN-122017678-A - Power line inspection method and inspection device

Abstract

The application discloses a power line inspection method and device of a current transformer, and a power line inspection method and device of a current transformer system. The checking method comprises the steps of carrying out power scheduling on the first current transformer, obtaining first operation power of the first current transformer after power scheduling, obtaining output power of an energy storage unit corresponding to the first current transformer, and determining a connection state of a power line connected with the first current transformer according to the first operation power and the output power. According to the checking method disclosed by the application, the power scheduling is carried out on the current transformer, so that the first operation power is different from the second operation power, and whether the power line connected with the first current transformer is abnormal or not is determined, so that the power line abnormality can be checked effectively.

Inventors

• YANG LONGFEI
• WANG JIAN
• CAI ZHIXIN
• ZHANG LI

Assignees

• 阳光电源股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (19)

1. 1. The method for checking the power line of the current transformer device is characterized in that the current transformer device comprises a plurality of current transformers, the current transformers and a plurality of energy storage units are in one-to-one correspondence, the current transformer comprises a first current transformer, the first current transformer is any one of the current transformers in the current transformer device, the input ends of the current transformers are connected with the energy storage units through the power line, and the output ends of the current transformers are connected in parallel; the inspection method comprises the following steps: Performing power scheduling on the first converter to obtain first operation power of the first converter after power scheduling; Obtaining output power of an energy storage unit corresponding to the first converter; And determining the connection state of the power line connected with the first converter according to the first operating power and the output power.
2. 2. The method of checking as set forth in claim 1, wherein said power scheduling the first converter includes: After the energy storage units in the converter device are balanced, acquiring first initial power of the first converter and second initial power of each second converter before power scheduling, wherein the second converters are any converters except the first converter in the converter device; And carrying out power scheduling on the first converter according to the first initial power and the second initial power so that the first operation power of the first converter is different from the second operation power of the second converter, and the sum of the powers of all converters after power scheduling is the same as the sum of the initial powers of all converters.
3. 3. The method of checking as set forth in claim 2, wherein said power scheduling the first converter according to the first initial power and the second initial power includes: And carrying out power scheduling on the first converter according to the preset scheduling power and the total scheduling power under the condition that the second initial power is larger than the preset scheduling power and the sum value of the first initial power and the total scheduling power is smaller than or equal to a target threshold value, wherein the total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converters.
4. 4. The method according to claim 3, wherein the power scheduling the first converter according to the preset scheduling power and the total scheduling power includes: Controlling the first converter to work according to the sum value of the first initial power and the total scheduling power; and controlling the second converter to work according to the difference value between the second initial power and the preset scheduling power.
5. 5. The method of checking as set forth in claim 2, wherein said power scheduling the first converter according to the first initial power and the second initial power includes: And carrying out power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the first initial power is larger than the total scheduling power and the sum value of the second initial power and the preset scheduling power is smaller than or equal to a target threshold value, wherein the total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converters.
6. 6. The method according to claim 5, wherein the power scheduling the first converter according to the preset scheduling power and the total scheduling power includes: controlling the first converter to work according to the difference value between the first initial power and the total scheduling power; and controlling the second converter to work according to the sum value of the second initial power of the converter and the preset scheduling power.
7. 7. The inspection method according to claim 2, characterized in that the inspection method further comprises: And stopping checking the power line under the condition that a first preset condition is not met and a second preset condition is not met, wherein the first preset condition is that the second initial power is larger than preset scheduling power and the sum value of the first initial power and the total scheduling power is smaller than or equal to a target threshold value, and the second preset condition is that the first initial power is larger than the total scheduling power and the sum value of the second initial power and the preset scheduling power is smaller than or equal to the target threshold value.
8. 8. The inspection method according to any one of claims 3 to 7, further comprising: and determining the target threshold according to the maximum chargeable/dischargeable power of the converter and the maximum chargeable/dischargeable power of the energy storage unit.
9. 9. The inspection method according to claim 1, wherein the determining the connection state of the power line connected to the first converter from the first operation power and the output power includes: determining that the power line connected with the first converter is abnormal in connection under the condition that the difference value between the first operating power and the output power of the energy storage unit is larger than or equal to a set difference value; and under the condition that the difference value between the first operating power and the output power of the energy storage unit is smaller than a set difference value, determining that the power line connected with the first converter is correctly connected.
10. 10. The inspection method according to claim 1, characterized in that the inspection method further comprises: and under the condition that no abnormality exists in the power lines connected with all the converters, controlling the converters to work according to the initial power of the converters, and stopping checking the power lines.
11. 11. The power line inspection unit of the converter device is characterized by comprising a plurality of converters, wherein the converters correspond to the energy storage units one by one, the converters comprise a first converter, the first converter is any one of the converters in the converter device, the input ends of the converters are connected with the energy storage units through power lines, and the output ends of the converters are connected in parallel; the inspection unit includes: The first power scheduling module is used for carrying out power scheduling on the first converter and acquiring first running power of the first converter after power scheduling; The first power acquisition module is used for acquiring the output power of the energy storage unit corresponding to the first converter; And the first state determining module is used for determining the connection state of the power line connected with the first converter according to the first operating power and the output power.
12. 12. The inspection unit of claim 11, wherein the first power scheduling module comprises: The power control device comprises an acquisition sub-module, a power control module and a power control module, wherein the acquisition sub-module is used for acquiring a first initial power of the first converter and a second initial power of each second converter before power scheduling after an energy storage unit in the converter device is balanced, and the second converters are any converters except the first converter in the converter device; The scheduling sub-module is used for carrying out power scheduling on the first converter according to the first initial power and the second initial power so that the first operation power of the first converter is different from the second operation power of the second converter, and the sum of the power of all converters after power scheduling is the same as the sum of the initial power of all converters.
13. 13. The inspection unit of claim 12, wherein the scheduling sub-module comprises: The first scheduling unit is used for performing power scheduling on the first current transformer according to the preset scheduling power and the total scheduling power when the second initial power is larger than the preset scheduling power and the sum value of the first initial power and the total scheduling power is smaller than or equal to a target threshold value, wherein the total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second current transformers.
14. 14. The inspection unit of claim 12, wherein the scheduling sub-module comprises: And the second scheduling unit is used for performing power scheduling on the first current transformer according to the preset scheduling power and the total scheduling power when the first initial power is larger than the total scheduling power and the sum value of the second initial power and the preset scheduling power is smaller than or equal to a target threshold value, wherein the total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second current transformers.
15. 15. An inspection unit according to claim 12, characterized in that the inspection unit further comprises: The power line inspection device comprises a stopping module, a power line inspection module and a power line inspection module, wherein the stopping module is used for stopping inspection of the power line under the condition that a first preset condition is not met and a second preset condition is not met, the first preset condition is that the second initial power is larger than preset dispatching power and the sum value of the first initial power and total dispatching power is smaller than or equal to a target threshold value, and the second preset condition is that the first initial power is larger than the total dispatching power and the sum value of the second initial power and the preset dispatching power is smaller than or equal to the target threshold value.
16. 16. The inspection unit of claim 11, wherein the first status determination module comprises: The first determining submodule is used for determining that the power line connected with the first converter is abnormal when the difference value between the first running power and the output power of the energy storage unit is larger than or equal to a set difference value; and the second determining submodule is used for determining that the power line connected with the first converter is correctly connected under the condition that the difference value of the first operating power and the output power of the energy storage unit is smaller than a set difference value.
17. 17. An inspection unit according to claim 11, characterized in that the inspection unit further comprises: And the control module is used for controlling the converter to work according to the initial power of the converter and stopping checking the power lines under the condition that no abnormality exists in all the power lines connected with the converter.
18. 18. The method for checking the power line of the current transformation system is characterized in that the current transformation system comprises a plurality of current transformers and a plurality of energy storage units, wherein the current transformers and the energy storage units are in one-to-one correspondence, the current transformers comprise first current transformers, and the first current transformers are any one of the current transformers in the current transformation system; the inspection method comprises the following steps: Performing power scheduling on the first converter to obtain first operation power of the first converter after power scheduling; Obtaining output power of an energy storage unit corresponding to the first converter; And determining the connection state of the power line connected with the first converter according to the first operating power and the output power.
19. 19. The power line inspection device of the current transformation system is characterized in that the current transformation system comprises a plurality of current transformers and a plurality of energy storage units, wherein the current transformers correspond to the energy storage units one by one, the current transformers comprise first current transformers, the first current transformers are any one of the current transformers in the current transformation system, the input ends of the current transformers are connected with the energy storage units through power lines, and the output ends of the current transformers are connected in parallel; The inspection apparatus includes: The second power scheduling module is used for carrying out power scheduling on the first converter and acquiring first running power of the first converter after power scheduling; The second power acquisition module is used for acquiring the output power of the energy storage unit corresponding to the first converter; and the second state determining module is used for determining the connection state of the power line connected with the first converter according to the first operating power and the output power.

Description

Power line inspection method and inspection device Technical Field The application relates to the technical field of converters, in particular to a power line inspection method and device of a converter device and a power line inspection method and device of a converter system. Background The current transformation system comprises an energy storage unit and a current transformer, wherein the energy storage unit is connected with the current transformer through a power line so as to transmit electric energy of the energy storage unit to the current transformer. The power line connection between each converter and the corresponding energy storage unit is ensured to be correct, and the normal operation of the system can be ensured. How to check the abnormal connection of the power line is a problem to be solved. Disclosure of Invention The embodiment of the application provides a power line inspection method and device of a current transformer, and a power line inspection method and device of a current transformer system. The embodiment of the application provides a method for checking a power line of a current transformer, wherein the current transformer comprises a plurality of current transformers, the current transformers are in one-to-one correspondence with a plurality of energy storage units, the current transformer comprises a first current transformer, the first current transformer is any one of the current transformers in the current transformer, the input ends of the current transformers are connected with the energy storage units through the power line, and the output ends of the current transformers are connected in parallel; the inspection method comprises the following steps: Performing power scheduling on the first converter to obtain first operation power of the first converter after power scheduling; Obtaining output power of an energy storage unit corresponding to the first converter; And determining the connection state of the power line connected with the first converter according to the first operating power and the output power. In this way, the power scheduling of the converters can make the operation power of the first converter different from the second operation power of the second converter. And acquiring and determining whether the power line connected with the first converter is abnormal according to the first running power and the output power of the energy storage unit connected with the first converter, so that the power line abnormality can be effectively checked. The checking method of the embodiment of the application is beneficial to improving the accuracy of power line checking in the running process of the system converter, reducing the system maintenance cost, and also beneficial to timely checking the power line problems caused by power line aging, misoperation and the like, and improving the safety and stability of the system. In some embodiments, the power scheduling the first converter includes: After the energy storage units in the converter device are balanced, acquiring first initial power of the first converter and second initial power of each second converter before power scheduling, wherein the second converters are any converters except the first converter in the converter device; And carrying out power scheduling on the first converter according to the first initial power and the second initial power so that the first operation power of the first converter is different from the second operation power of the second converter, and the sum of the powers of all converters after power scheduling is the same as the sum of the initial powers of all converters. In this way, even in the case where the energy storage unit has the electric energy equalizing function, by performing power scheduling, the first operation power and the second operation power can be made different, so that detection of the power line can be performed. Meanwhile, the constant power of all converters before and after power scheduling is ensured, and the stability of the output of the converter device in the operation process can be ensured, so that the power supply of the converter device to a load in the operation process can not be influenced by the inspection of a power line. In some embodiments, the power scheduling the first converter according to the first initial power and the second initial power includes: And carrying out power scheduling on the first converter according to the preset scheduling power and the total scheduling power under the condition that the second initial power is larger than the preset scheduling power and the sum value of the first initial power and the total scheduling power is smaller than or equal to a target threshold value, wherein the total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converters. Therefore, the second initial power is compared with the preset schedul