CN115566806A - Remote monitoring device for ground resistance and control method thereof - Google Patents

Remote monitoring device for ground resistance and control method thereof Download PDF

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Publication number
CN115566806A
CN115566806A CN202211331170.9A CN202211331170A CN115566806A CN 115566806 A CN115566806 A CN 115566806A CN 202211331170 A CN202211331170 A CN 202211331170A CN 115566806 A CN115566806 A CN 115566806A
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battery
power
power generation
module
battery module
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余启富
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SHANGHAI ZHONGLAITE ZIJIN ELECTRICAL CO Ltd
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SHANGHAI ZHONGLAITE ZIJIN ELECTRICAL CO Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/005—Detection of state of health [SOH]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

Abstract

The invention discloses a remote monitoring device of a ground resistance and a control method thereof, which predict the SOC of a battery through a battery management system; dividing the battery SOC into three gears, wherein the healthy gear is 80-100% of the battery SOC, the sub-healthy gear is 60-80% of the battery SOC, and the unhealthy gear is lower than 60% of the battery SOC; according to local environmental conditions, wind power generation power, photovoltaic power generation power, battery SOC, altitude and environmental temperature are comprehensively considered, and control is performed through a battery management system.

Description

Remote monitoring device for ground resistance and control method thereof
Technical Field
The invention relates to the technical field of energy management, in particular to a ground resistance remote monitoring device and a control method thereof.
Background
When a high-voltage transmission line runs, the proportion of lightning accidents caused by poor grounding to the line fault rate is high, which is mainly caused by that when lightning strikes on the tower top or the ground wire (lightning conductor) of an iron tower, when lightning current leaks into the ground through an iron tower grounding device, the grounding resistance is higher, so that higher counterattack overvoltage is generated. The tower top grounding of the iron tower of the high-voltage transmission line is one of the main measures for line lightning protection, and the reliability of the tower top grounding has great significance for ensuring the safe and stable operation of the power system.
The tower ground resistance is important data, the tower ground resistance of the high-voltage transmission line is reduced, the lightning resistance level of the line can be improved, lightning accidents are reduced, the contact voltage and the step voltage are reduced near the tower, and human and animal electric shock accidents are prevented, so that the monitoring of the tower ground resistance of the high-voltage transmission line becomes particularly important.
At present, in the ground resistance measurement technology of the power transmission line, the circuit connection between the power transmission line grounding body and the grounding down conductor is generally required to be disconnected, and a manual measurement mode is also required. The grounding resistance measurement technology of the power transmission line has the advantages of large workload, low measurement efficiency, high cost required by measurement and relatively long measurement period, so that the grounding resistance measurement mode of the power transmission line is difficult to meet the actual application requirements of modern power systems. Meanwhile, if in lightning weather. And may even result in personal injury or death. Therefore, it is necessary to design a remote ground resistance monitoring device and a control method thereof.
Disclosure of Invention
The invention aims to provide a ground resistance remote monitoring device and a control method thereof, which aim to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a control method of a ground resistance remote monitoring device comprises the following steps:
s101, predicting the SOC of the battery through a battery management system;
s102, dividing the battery SOC into three gears, wherein the healthy gear is 80% -100% of the battery SOC, the sub-healthy gear is 60% -80% of the battery SOC, and the unhealthy gear is lower than 60% of the battery SOC;
and S103, comprehensively considering the wind power generation power, the photovoltaic power generation power, the battery SOC, the altitude and the ambient temperature according to local environmental conditions, and controlling through a battery management system.
According to the above technical solution, the S101 further includes:
performing online estimation on the SOC of the battery by using a table look-up method in combination with a Kalman filtering method;
obtaining parameters of different batteries under SOC by using a table look-up method;
substituting the parameters into a discrete state space equation and a measurement space equation of the battery equivalent circuit, wherein the equations are as follows:
Figure BDA0003913476920000021
according to the above technical solution, the S103 further includes:
when the SOC of the battery is 80-100%, the charging multiplying power is not higher than 0.5C, and the discharging multiplying power is not higher than 1.0C;
when the SOC of the battery is 60-80%, the charging multiplying power is not higher than 0.2C, and the discharging multiplying power is not higher than 0.5C;
when the battery SOC is lower than 60%, the charging rate is not higher than 0.1C, and the discharging rate is not higher than 0.2C.
When the battery SOC is lower than 60%, the battery module is recommended to be replaced.
According to the technical scheme, when the altitude is higher than 2000m and the SOC of the battery is at a sub-health gear or above, the battery is used by downshifting the charge-discharge rate; when the altitude is higher than 2000m and the SOC of the battery is in an unhealthy gear, the charge-discharge rate of the battery is not higher than 0.1C.
According to the technical scheme, when the temperature of the battery using environment is lower than-20 ℃, the battery module is provided with a heating belt;
and when the temperature of the battery module is higher than 70 ℃ and the temperature of the battery module is lower than minus 40 ℃, the battery module stops working.
According to the technical scheme, the power supplied by the battery module to the heating belt is not more than 0.1C.
A remote monitoring device for ground resistance comprises a wind-solar complementary control inversion all-in-one machine, a lithium ion battery module, a monitoring management module, a video monitoring module, a remote communication transmission module, a data sampling wire harness, spare parts and installation accessories,
the lithium ion battery module is connected with the monitoring management module, comprises a heating device and consists of lithium titanate systems connected in series and in parallel; the monitoring management module is connected with the wind-solar complementary control inversion all-in-one machine, the lithium ion battery module, the video monitoring module, the remote communication transmission module and the data sampling wire harness.
According to the technical scheme, the monitoring management module comprises a battery management system, a lightning stroke frequency counting unit and a grounding resistance calculating unit, wherein,
the battery management system is used for collecting and recording current, voltage, temperature and insulation resistance and estimating a battery S0C;
the lightning stroke frequency counting unit is used for collecting and storing lightning stroke frequency;
the grounding resistance calculating unit is used for calculating and storing grounding resistance and alarming the grounding resistance exceeding limit.
According to the technical scheme, the remote communication transmission module is connected with the video monitoring module and the monitoring management module and is used for remotely transmitting data acquired by the monitoring management module through 4G/5G;
and the video monitoring module is connected with the monitoring management module and the remote communication transmission module.
Compared with the prior art, the invention has the following beneficial effects: the invention fully considers the influences of different altitudes, different environmental temperatures, different battery SOCs and different wind-solar power generation powers, improves the use reliability, safety and durability of the device, and can be suitable for all-region full-temperature areas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a control method of a ground resistance remote monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system module composition in a scene of wind, photovoltaic and energy storage combined high-voltage power transmission in which a ground resistance remote monitoring device according to a second embodiment of the present invention is applied;
fig. 3 is a schematic diagram of the battery SOC parameter prediction of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a flowchart of a method for controlling a ground resistance remote monitoring device according to an embodiment of the present invention, where the method is applicable to a situation of controlling a ground resistance remote monitoring device, and the method can be executed by the ground resistance remote monitoring device according to the embodiment of the present invention, as shown in fig. 1, the method specifically includes the following steps:
and S101, predicting the SOC of the battery through a battery management system.
Illustratively, for a lithium iron phosphate battery, a table look-up method is combined with a Kalman filtering method to perform online estimation of battery SOC, parameters under different battery SOCs are obtained by the table look-up method, and the parameters are substituted into a discrete state space equation and a measurement space equation of a battery equivalent circuit, wherein the equations are as follows:
Figure BDA0003913476920000051
please refer to fig. 3, wherein U 1,k 、U 2,k 、U 3,k Representing the terminal voltages of the R-C branch 1, the branch 2 and the branch 3 predicted in the kth step; SOC k Representing the SOC value of the battery in the k step; eta represents charge-discharge coulombic efficiency; t represents a sampling interval; q c Representing the calibration electric quantity of the battery; u shape 0,k Represents the terminal voltage of the thevenin equivalent circuit;
U ocv,k (SOCk) represents a battery electromotive force; omega k Measurement noise for state transition space; v. of k Measurement noise representing a measurement space; tau is 1 ＝R 1 *C 1 ，τ 2 ＝R 2 *C 2 ，τ 3 ＝R 3 *C 3 (ii) a Wherein R is the resistance in the R-C branch, and C is the capacitance in the R-C branch.
Illustratively, for a nickel cobalt lithium manganate battery, capacity fading presents an obvious linear fading trend, then the battery capacity y = -ax + b, x is the cycle number, and a and b are constants;
for example, for a lithium titanate battery, the capacity fading tends to decrease approximately linearly with the increase of the cycle number, and then the battery capacity y = ax + b, x is the cycle number, and a and b are constants.
And S102, dividing the battery SOC into three gears, wherein the healthy gear is 80% -100% of the battery SOC, the sub-healthy gear is 60% -80% of the battery SOC, and the unhealthy gear is lower than 60% of the battery SOC.
In the embodiment of the invention, the battery SOC is according to part 2 of the lithium iron phosphate battery pack for YDT2344.2-2015 communication: the discrete battery pack and the T/ACEF025-2021 user side energy storage echelon utilization battery technical specification are divided into three grades.
S103, comprehensively considering wind power generation power, photovoltaic power generation power, battery state of health (SOC), altitude and ambient temperature according to local environmental conditions, and controlling through a battery management system, wherein the method specifically comprises the following steps:
further, when the SOC of the battery is 80% -100%, the charging rate is not higher than 0.5C, and the discharging rate is not higher than 1.0C;
further, when the SOC of the battery is 60-80%, the charging rate is not higher than 0.2C, and the discharging rate is not higher than 0.5C.
Further, when the battery SOC is less than 60%, the charge rate is not higher than 0.1C, and the discharge rate is not higher than 0.2C.
Further, when the battery SOC is lower than 60%, it is recommended to replace the battery module.
When the altitude is higher than 2000m and the SOC of the battery is at a sub-health gear or above, the charge-discharge rate of the battery is shifted down for use; when the altitude is higher than 2000m and the SOC of the battery is in an unhealthy gear, the charging and discharging multiplying power of the battery is not higher than 0.1C. The wind power generation power and the photovoltaic power generation power are based on the general requirements of GB/T3859.2-2013 semiconductor converters and the 1 st part to the 2 nd part of the power grid commutation converter: the application guide, if the altitude is higher than 2000m, the power is reduced, preferably the power is reduced by half.
Furthermore, when the temperature of the battery using environment is lower than-20 ℃, the battery module is required to be provided with a heating belt;
furthermore, the power supplied by the battery module to the heating belt is not more than 0.1C;
further, when the temperature of the battery module is higher than 70 ℃ and the temperature of the battery module is lower than-40 ℃, the battery module stops working.
Wherein the environment temperature fully considers the charge-discharge safety range of the lithium ion battery according to
GB/T31486-2015 electric automobile power accumulator electrical property requirement and test method, the battery safe discharge temperature range is-20 ℃ to 55 ℃; according to GB/T36276-2018 lithium ion battery for power energy storage, the safe charging temperature range of the battery is 5-45 ℃; according to part 2 of the lithium iron phosphate battery pack for YDT2344.1-2015 communication: the upper and lower limits of the safe insulation temperature of the battery in the integrated battery pack are 70 ℃ and minus 40 ℃.
Illustratively, when the battery SOC is 80% to 100%, the altitude is not higher than 2000m, the ambient temperature is not lower than 0 ℃ and not higher than 45 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.5C;
if the battery module is in a full-electricity state, wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment;
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 1.0C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 1.0C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.5C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is 80% to 100%, the altitude is not higher than 2000m, the ambient temperature is lower than 0 ℃ and not lower than-20 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.2C;
when the battery module is charged, the heating belt is preferentially supplied with power through the battery management system, and when the temperature of the battery module is not lower than 0 ℃, the power supply to the heating belt is stopped, and the battery module is charged.
If the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.5C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.5C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.2C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is 80% -100%, the altitude is not higher than 2000m, and the ambient temperature is lower than-20 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.2C;
when the battery module is charged, the heating belt is preferentially supplied with power through the battery management system, and when the temperature of the battery module is not lower than 0 ℃, the power supply to the heating belt is stopped, and the battery module is charged.
If the battery module is in a full-electricity state, wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.5C;
before the battery module discharges, wind power generation and/or photovoltaic power generation are/is required to preferentially supply power to the heating belt through the battery management system, and when the temperature of the battery module is not lower than-20 ℃, the power supply to the heating belt is stopped, and the battery module starts to discharge.
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.5C;
before the battery module discharges, the battery module supplies power to the heating belt through the battery management system, when the temperature of the battery module is not lower than-20 ℃, the power supply to the heating belt is stopped, and the battery module starts to supply power to a load.
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.2C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use by the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is 80% to 100%, the altitude is not higher than 2000m, and the ambient temperature is higher than 45 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.2C;
if the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.5C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.5C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.2C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is less than 80% and not less than 60%, the altitude is not more than 2000m, the ambient temperature is not less than 0 ℃ and not more than 45 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.2C;
if the battery module is in a full-electricity state, wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.5C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.5C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.2C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is below 80% and not less than 60%, the altitude is not higher than 2000m, and the ambient temperature is below 0 ℃ and not less than-20 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.1C;
when the battery module is charged, the heating belt is preferentially supplied with power through the battery management system, and when the temperature of the battery module is not lower than 0 ℃, the power supply to the heating belt is stopped, and the battery module is charged.
If the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.2C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.2C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is below 80% and not less than 60%, the altitude is not higher than 2000m, and the ambient temperature is below-20 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.1C;
when the battery module is charged, the heating belt is preferentially supplied with power through the battery management system, and when the temperature of the battery module is not lower than 0 ℃, the power supply to the heating belt is stopped, and the battery module is charged.
If the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.2C;
before the battery module discharges, wind power generation and/or photovoltaic power generation are/is required to preferentially supply power to the heating belt through the battery management system, and when the temperature of the battery module is not lower than-20 ℃, the power supply to the heating belt is stopped, and the battery module starts to discharge.
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.2C;
before the battery module discharges, the battery module supplies power to the heating belt through the battery management system, and when the temperature of the battery module is not lower than minus 20 ℃, the power supply to the heating belt is stopped, and the battery module starts to supply power to a load.
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is below 80% and not less than 60%, the altitude is not higher than 2000m, and the ambient temperature is higher than 45 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.1C;
if the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.2C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.2C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is less than 60%, the altitude is not higher than 2000m, the ambient temperature is not lower than 0 ℃ and not higher than 45 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.1C;
if the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.2C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.2C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is below 60%, the altitude is not higher than 2000m, the ambient temperature is below 0 ℃ and not lower than-20 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the rest power is used for charging the battery module, and the charging multiplying power is not higher than 0.1C;
when the battery module is charged, the heating belt is preferentially supplied with power through the battery management system, and when the temperature of the battery module is not lower than 0 ℃, the power supply to the heating belt is stopped, and the battery module is charged.
If the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.1C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.1C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Illustratively, when the battery SOC is below 60%, the altitude is not above 2000m, and the ambient temperature is below-20 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.1C;
when the battery module is charged, the heating belt is preferentially supplied with power through the battery management system, and when the temperature of the battery module is not lower than 0 ℃, the power supply to the heating belt is stopped, and the battery module is charged.
If the battery module is in a full-power state at the moment, the wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.1C;
before the battery module discharges, wind power generation and/or photovoltaic power generation are/is required to preferentially supply power to the heating belt through the battery management system, and when the temperature of the battery module is not lower than-20 ℃, the power supply to the heating belt is stopped, and the battery module starts to discharge.
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.1C;
before the battery module discharges, the battery module supplies power to the heating belt through the battery management system, when the temperature of the battery module is not lower than-20 ℃, the power supply to the heating belt is stopped, and the battery module starts to supply power to a load.
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use in the wind power generation and/or the photovoltaic power generation.
Exemplarily, when the battery SOC is below 80% and not below 60%, the altitude is not above 2000m, and the ambient temperature is above 45 ℃:
(1) When the wind power generation power and/or the photovoltaic power generation power meet the use requirements of related loads, the loads are supplied with power preferentially, the battery module is charged by the residual power, and the charging multiplying power is not higher than 0.1C;
if the battery module is in a full-electricity state, wind power generation and/or photovoltaic power generation are/is used for reducing power, and the battery module does not work at the moment.
(2) When the wind power generation power and/or the photovoltaic power generation power cannot meet the use requirements of related loads, the wind power generation power and/or the photovoltaic power generation power and the battery module supply power to the loads at the same time, and the discharge multiplying power of the battery module is not higher than 0.1C;
(3) When the wind power generation power and the photovoltaic power generation power are 0, the battery module independently supplies power to the load, and the discharge multiplying power of the battery module is not higher than 0.1C;
(4) When the high-voltage transmission grounding resistance remote monitoring device is in a non-working state, the battery module is charged by wind power generation and/or photovoltaic power generation, and the charging multiplying power is not higher than 0.1C;
and if the wind power generation power and/or the photovoltaic power generation power exceed the highest charging rate of the battery module, reducing the power for use by the wind power generation and/or the photovoltaic power generation.
Example two
The second embodiment of the invention provides a ground resistance remote monitoring device, and fig. 2 is a schematic diagram of system module components of the second embodiment of the invention in a scene of wind-solar-storage combined high-voltage power transmission, wherein the second embodiment of the invention provides the ground resistance remote monitoring device, and the second embodiment of the invention comprises a commercial power supply, a photovoltaic panel, a wind power generation device, a ground resistance remote monitoring device, a lightning stroke induction coil and a special sensor, as shown in fig. 2.
The commercial power is any one of 380VAC and 220 VAC.
The wind power generation is a vertical axis or horizontal axis wind power generator with hectowatt level power.
The photovoltaic panel is connected with the wind-solar complementary control inversion all-in-one machine, is composed of monocrystalline silicon or gallium arsenide photovoltaic modules in a series-parallel connection mode, and can be divided into flexible photovoltaic modules and light hard photovoltaic modules according to different application scenes.
The grounding resistance remote monitoring device comprises a wind-solar complementary control inversion all-in-one machine, a lithium ion battery module, a monitoring management module, a video monitoring module, a remote communication transmission module, a data sampling wire harness, spare parts, installation accessories and the like.
The lightning stroke induction coil mainly consists of an electromagnetic induction coil, and in some embodiments, the lightning stroke induction coil is fixed on the high-voltage transmission iron tower, and when a lightning stroke occurs, the electromagnetic induction coil generates a small current, and the small current is converted into an electric signal by a data sampling wire harness and transmitted to a lightning stroke frequency counting unit in the remote communication transmission module;
the special sensors comprise a zero resistance sensor, a fixed resistance sensor, a grounding voltage sensor, a grounding current sensor and the like. The function is to collect the ground resistance.
The IP grade of the remote online grounding resistance monitoring device is IP65;
the ground resistance remote on-line monitoring device is provided with a display screen and can display the lightning stroke times and the real-time ground resistance.
The wind-solar complementary control inversion all-in-one machine in the ground resistance remote online monitoring device is connected with a commercial power, a photovoltaic panel, a wind power generation and monitoring management module and mainly comprises a DC/DC and an AC/DC.
The lithium ion battery module in the ground resistance remote online monitoring device is connected with the monitoring management module, comprises a heating device and is formed by connecting high-safety battery monomers such as a lithium titanate system or a lithium iron phosphate system in series and parallel.
The monitoring management module in the ground resistance remote online monitoring device is connected with the wind-solar complementary control inversion all-in-one machine, the lithium ion battery module, the video monitoring module, the remote communication transmission module and the data sampling wire harness, and consists of a BMS (battery management system), a lightning stroke frequency counting unit and a ground resistance calculating unit.
BMS in the monitoring management module has the functions of collecting and recording current, voltage, temperature and insulation resistance, has the functions of overcharge, overdischarge, overtemperature, undervoltage, undertemperature, short circuit and insulation protection, and has the functions of SOC and SOH estimation.
The lightning stroke frequency counting unit in the monitoring management module has the functions of collecting and storing lightning stroke frequencies;
the ground resistance calculation unit in the monitoring management module has the functions of ground resistance calculation and storage and has the function of ground resistance overrun warning;
the remote communication transmission module in the ground resistance remote online monitoring device is connected with the video monitoring module and the monitoring management module, and has the function of remotely transmitting data acquired by the monitoring management module by 4G/5G;
the video monitoring module in the ground resistance remote on-line monitoring device is connected with the monitoring management module and the remote communication transmission module and consists of visible light and/or infrared light video monitoring equipment and a decoder thereof.
The data sampling wire harness in the ground resistance remote online monitoring device is respectively connected with the lightning stroke induction coil, the special sensor and the monitoring management module, so that the lightning stroke times and real-time ground resistance acquisition are realized.
The ground voltage sensor and the ground current sensor are fixed underground near the high-voltage power transmission iron tower, so that a ground resistance calculation unit in the monitoring and control module can detect a set ground resistance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A control method of a remote ground resistance monitoring device is characterized by comprising the following steps:
s101, predicting the SOC of the battery through a battery management system;
s102, dividing the battery SOC into three gears, wherein the healthy gear is 80% -100% of the battery SOC, the sub-healthy gear is 60% -80% of the battery SOC, and the unhealthy gear is lower than 60% of the battery SOC;
and S103, comprehensively considering the wind power generation power, the photovoltaic power generation power, the battery SOC, the altitude and the ambient temperature according to local environmental conditions, and controlling through a battery management system.
2. The control method of the ground resistance remote monitoring device according to claim 1, characterized in that: the S101 further includes:
performing online estimation on the SOC of the battery by using a table look-up method and a Kalman filtering method;
obtaining parameters of different batteries under SOC by using a table look-up method;
substituting the parameters into a discrete state space equation and a measurement space equation of the equivalent circuit of the battery, wherein the equations are as follows:
Figure FDA0003913476910000011
3. the control method of the ground resistance remote monitoring device according to claim 1, characterized in that: the S103 further includes:
when the SOC of the battery is 80-100%, the charging multiplying power is not higher than 0.5C, and the discharging multiplying power is not higher than 1.0C;
when the SOC of the battery is 60-80%, the charging multiplying power is not higher than 0.2C, and the discharging multiplying power is not higher than 0.5C;
when the SOC of the battery is lower than 60%, the charging multiplying power is not higher than 0.1C, and the discharging multiplying power is not higher than 0.2C;
when the battery SOC is lower than 60%, the battery module is recommended to be replaced.
4. The control method of the ground resistance remote monitoring device according to claim 3, characterized in that: when the altitude is higher than 2000m and the SOC of the battery is at a sub-health gear or above, the charge-discharge rate of the battery is downshifted for use; when the altitude is higher than 2000m and the SOC of the battery is in an unhealthy gear, the charging and discharging multiplying power of the battery is not higher than 0.1C.
5. The control method of the ground resistance remote monitoring device according to claim 4, characterized in that: when the temperature of the battery using environment is lower than-20 ℃, the battery module is provided with a heating belt;
and when the temperature of the battery module is higher than 70 ℃ and the temperature of the battery module is lower than minus 40 ℃, the battery module stops working.
6. The control method of the ground resistance remote monitoring device according to claim 5, characterized in that: the power supplied by the battery module to the heating belt is not more than 0.1C.
7. The utility model provides a ground resistance remote monitoring device which characterized in that: comprises a wind-solar complementary control inversion all-in-one machine, a lithium ion battery module, a monitoring management module, a video monitoring module, a remote communication transmission module, a data sampling wire harness, spare parts and installation accessories,
the lithium ion battery module is connected with the monitoring management module, comprises a heating device and consists of lithium titanate systems which are connected in series and in parallel; the monitoring management module is connected with the wind-solar complementary control inversion all-in-one machine, the lithium ion battery module, the video monitoring module, the remote communication transmission module and the data sampling wire harness.
8. The ground resistance remote monitoring device according to claim 7, characterized in that: the monitoring management module comprises a battery management system, a lightning stroke frequency counting unit and a grounding resistance calculating unit, wherein,
the battery management system is used for collecting and recording current, voltage, temperature and insulation resistance and estimating a battery S0C;
the lightning stroke frequency counting unit is used for collecting and storing lightning stroke frequency;
the grounding resistance calculating unit is used for calculating and storing grounding resistance and alarming the grounding resistance exceeding limit.
9. The ground resistance remote monitoring device according to claim 7, characterized in that:
the remote communication transmission module is connected with the video monitoring module and the monitoring management module and is used for remotely transmitting data acquired by the monitoring management module through 4G/5G;
and the video monitoring module is connected with the monitoring management module and the remote communication transmission module.
CN202211331170.9A 2022-10-28 2022-10-28 Remote monitoring device for ground resistance and control method thereof Pending CN115566806A (en)

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