CN110045313B - Three-phase energy storage system ammeter current transformer connection detection method - Google Patents
Three-phase energy storage system ammeter current transformer connection detection method Download PDFInfo
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- CN110045313B CN110045313B CN201910205915.9A CN201910205915A CN110045313B CN 110045313 B CN110045313 B CN 110045313B CN 201910205915 A CN201910205915 A CN 201910205915A CN 110045313 B CN110045313 B CN 110045313B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention relates to a three-phase energy storage system ammeter current transformer connection detection method which is applied to a three-phase energy storage system and used for detecting whether ammeter connection in the three-phase energy storage system is wrong or not. The method can quickly and accurately judge the connection condition of each phase of the electric meter, thereby being convenient for solving the interference caused by the incorrect connection of the current transformer of the electric meter to the normal work of the energy storage system and realizing the self-checking function of the energy storage system.
Description
Technical Field
The invention belongs to the application field of electric meter use, in particular to an electric meter arranged in a three-phase energy storage system, and relates to a method for detecting whether the connection of the electric meter is wrong or not.
Background
As is known, in the existing energy storage system, an electric meter is an indispensable part, and the energy storage system can sense the electricity utilization condition of the whole house through the electric meter connected to the house, so that the spontaneous self-utilization of the system power is realized through the electricity utilization value, and the maximum utilization of the energy storage system is realized. Similarly, the electric meter plays a key role in the field of backflow prevention, and for many national safety regulations which do not allow grid-connected power, the electric meter controls the grid-connected power detected by the electric meter.
For the ammeter with the external Current Transformer (CT), the Current Transformer (CT) is only required to be clamped on an AC line of an original household end, the original AC connection line is not required to be damaged, the ammeter is widely used, and the correct connection mode is shown in figure 1. However, in practical application, it is found that the practical application of the three-phase energy storage system adopts a three-phase four-wire system, and three Current Transformer (CT) interfaces of a three-phase electric meter are added, so that the situations of wrong connection and reverse connection of the electric meter are quite possible. Without the wire connection rule being solved, there may be 192 wire connection modes in random situations, only one of which is correct wire connection, and the misconnection situation may cause the whole system to work normally according to the requirement.
In order to avoid the occurrence of such errors, once according to the characteristics of the system, the power selling power of the power grid is necessarily smaller than the output power of the energy storage inverter, so that the difference value between the output power of the energy storage inverter and the power selling power of the electric meter is calculated, and if the difference value is a negative value, the electric meter can be considered to be reversely connected. However, the scheme can only judge the actual power purchasing situation of the power grid under the condition of a large load, and is only suitable for a single photovoltaic energy storage inverter system, and the judgment method completely fails for an energy storage transformation system which is provided with a plurality of inverters or carries out AC coupling and DC coupling on the inverters.
In summary, the prior art has the following disadvantages:
firstly, the prior art scheme mainly relates to the field of single-phase systems, and compared with a single-phase system, a three-phase system has the problem that the probability of misconnection of the CT of the electric meter is far higher than that of the single-phase system due to the complexity of the three-phase system.
Secondly, the prior art has one-sidedness in the application of a single photovoltaic energy storage inverter system, can not judge the condition of reverse connection of all electric meters, and can not meet the requirements of a plurality of inverter systems and energy storage transformation systems.
Disclosure of Invention
The invention aims to provide a method for detecting connection of an ammeter current transformer of a three-phase energy storage system, which is suitable for an ammeter in the three-phase energy storage system and can accurately detect whether wiring is wrong.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a three-phase energy storage system ammeter current transformer connects detection method, is applied to in order to detect the ammeter wherein and connects whether wrong in the three-phase energy storage system, its characterized in that: the connection detection method of the three-phase energy storage system ammeter current transformer comprises the following steps:
discharging the three-phase energy storage system according to different set discharging powers in M times, and charging the three-phase energy storage system according to different set charging powers in N times, wherein M, N are positive integers greater than 4;
judging whether the change value and the change direction of the total power detected by the electric meter before and after the discharging/charging are consistent with the set change value and the change direction of the discharging power/charging power or not at each discharging/charging,
if the change direction of the total power detected by the ammeter before and after the discharging/charging is opposite to the change direction of the set discharging power/charging power, and the change value of the total power detected by the ammeter before and after the discharging/charging is consistent with the change value of the set discharging power/charging power, the reverse connection count of the ammeter is increased by 1, and the forward connection count of the ammeter is cleared;
if the change direction of the total power detected by the electric meter before and after the discharging/charging is the same as the set change direction of the discharging power/charging power, and the change value of the total power detected by the electric meter before and after the discharging/charging is consistent with the fixed change value of the discharging power/charging power, the positive counting number of the electric meter is increased by 1;
if the change direction of the total power detected by the ammeter before and after the discharging/charging is opposite to or the same as the change direction of the set discharging power/charging power, and the change value of the total power detected by the ammeter before and after the discharging/charging is not consistent with the change value of the set discharging power/charging power, whether the change value and the change direction of the phase power detected by each phase current transformer are consistent with one third and the change direction of the change value of the set discharging power/charging power is further judged;
if the change direction of the phase power detected by a phase current transformer is the same as the change direction of the set discharging power/charging power, and the change value of the phase power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power, adding 1 to the positive connection count of the phase ammeter, and resetting the reverse connection count of the phase ammeter;
if the change direction of the phase power detected by a phase current transformer is opposite to the change direction of the set discharging power/charging power, and the change value of the phase power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power, adding 1 to the counter-connection count of the phase ammeter, and resetting the counter-connection count of the phase ammeter;
if the positive connection count of one phase of the ammeter is greater than the preset number J, and J is a positive integer greater than 2, marking the connection state of the phase of the ammeter as correct connection, and if the reverse connection count of one phase of the ammeter is greater than the preset number J, marking the connection state of the phase of the ammeter as reverse connection;
in the discharging/charging process, if the positive connection count of the ammeter is continuously accumulated to K, wherein K is a positive integer greater than 2, the connection state of the ammeter is judged to be correct connection;
after finishing each discharging and charging, if the reverse connection count of the electric meter reaches or exceeds L and L = (M + N) × 60%, judging the connection state of the electric meter as reverse connection; if the reverse connection count of the electric meter does not reach L, the connection state of the one-phase or multi-phase electric meter which is not marked with the connection state is judged to be incorrect connection.
Preferably, a total power change threshold is preset, if an absolute value of a sum of a total power change value detected by the electric meter before and after discharging/charging and a set discharge power/charging power change value is within a range defined by the total power change threshold, a direction of the total power change detected by the electric meter before and after discharging/charging is opposite to a direction of the set discharge power/charging power change, and the total power change value detected by the electric meter before and after discharging/charging is consistent with the set discharge power/charging power change value; if the absolute value of the difference between the total power change value detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value is within the range defined by the total power change threshold, the direction of the total power change detected by the electric meter before and after discharging/charging is the same as the set discharge power/charging power change direction, and the total power change value detected by the electric meter before and after discharging/charging is consistent with the set discharge power/charging power change value.
Preferably, the total power variation threshold is set to 10% of the set variation value of the discharging power/charging power.
Preferably, a phase power change threshold is preset, and if an absolute value of a difference between a change value of power detected by a phase current transformer and one third of a change value of set discharging power/charging power is within a range defined by the phase power change threshold, a change direction of the power detected by the phase current transformer is the same as a change direction of the set discharging power/charging power, and the change value of the power detected by the phase current transformer and one third of the change value of the set discharging power/charging power have consistency; if the absolute value of the sum of the change value of the power detected by a phase current transformer and one third of the change value of the set discharging power/charging power is within the range defined by the phase power change threshold, the change direction of the power detected by the phase current transformer is opposite to the change direction of the set discharging power/charging power, and the change value of the power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power.
Preferably, the phase power variation threshold is set to 4% of the set variation value of the discharge power/charge power.
Preferably, when the three-phase energy storage system discharges, the discharge power of each discharge is gradually increased according to a preset discharge rate gradient; and when the three-phase energy storage system is charged, the charging power of each charging is gradually increased according to a preset charging power gradient.
Preferably, M is 5, N is 5, J is 3, and K is 3.
Preferably, when the three-phase energy storage system starts to discharge/charge and stably discharges/charges after a time delay, the total power/phase power detected by the electric meter is read.
Preferably, the delay time is 10 s.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the method can quickly and accurately judge the connection condition of each phase of the electric meter, thereby being convenient for solving the interference caused by the incorrect connection of the current transformer of the electric meter to the normal work of the energy storage system and realizing the self-checking function of the energy storage system.
Drawings
FIG. 1 is a schematic diagram of the correct wiring of an electricity meter.
Fig. 2 is a flow chart of a method for detecting connection of a current transformer of an electric meter of a three-phase energy storage system.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: the general idea is that on the premise that software sends a specific ammeter detection instruction, multiple charging and discharging actions with specific power can be executed, and after the charging and discharging power is stable, whether the action and direction of ammeter power change are consistent with the set charging and discharging power or not is judged, so that whether ammeter connection is in error or not is determined.
The connection detection method of the three-phase energy storage system ammeter current transformer specifically comprises the following steps:
discharging the three-phase energy storage system according to different set discharging powers by M times, and charging the three-phase energy storage system according to different set charging powers by N times. M, N are each positive integers greater than 4. When the three-phase energy storage system discharges, the discharging power of each time of discharging is gradually increased according to a preset discharging rate gradient; when the three-phase energy storage system is charged, the charging power of each charging is gradually increased according to the preset charging power gradient.
The following decision steps are performed at each discharging/charging:
and judging whether the change value and the change direction of the total power detected by the electric meter before and after the discharging/charging are consistent with the set change value and the change direction of the discharging power/charging power or not at each discharging/charging. The meaning of the consistency of the change direction is that the change direction of the total power detected by the electric meter is the same as the change direction of the set discharging power/charging power, namely, when the set discharging power/charging power is increased/decreased, the total power detected by the electric meter is also increased/decreased. The meaning of the consistency of the variation value is that the variation value of the total power detected by the electricity meter is nearly the same as the variation value of the set discharging power/charging power.
If the change direction of the total power detected by the electric meter before and after the discharging/charging is opposite to the set change direction of the discharging power/charging power, and the change value of the total power detected by the electric meter before and after the discharging/charging is consistent with the fixed change value of the discharging power/charging power, the electric meter is indicated to be reversely connected, at the moment, the reverse connection count of the electric meter is increased by 1, and the forward connection count of the electric meter is cleared.
The specific method for judging consistency is as follows: a total power variation threshold is preset, and is generally set to 10% of the set variation value of the discharge power/charge power.
If the absolute value of the sum of the total power change value detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value is within the range defined by the total power change threshold value, the direction of the total power change detected by the electric meter before and after discharging/charging is opposite to the set discharge power/charging power change direction, and the total power change value detected by the electric meter before and after discharging/charging is consistent with the set discharge power/charging power change value.
If the change direction of the total power detected by the electric meter before and after the discharging/charging is the same as the set change direction of the discharging power/charging power, and the change value of the total power detected by the electric meter before and after the discharging/charging is consistent with the fixed change value of the discharging power/charging power, the electric meter is judged to be connected, and at the moment, the electric meter is added with 1 in the positive connection count.
The specific method for judging consistency is as follows: if the absolute value of the difference between the total power change value detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value is within the range defined by the total power change threshold, the direction of the total power change detected by the electric meter before and after discharging/charging is the same as the set discharge power/charging power change direction, and the total power change value detected by the electric meter before and after discharging/charging is consistent with the set discharge power/charging power change value.
If the change direction of the total power detected by the electric meters before and after the discharging/charging is opposite to or the same as the change direction of the set discharging power/charging power, and the change value of the total power detected by the electric meters before and after the discharging/charging is not consistent with the change value of the set discharging power/charging power, whether the change value and the change direction of the phase power detected by each phase current transformer are consistent with one third and the change direction of the set discharging power/charging power is further judged.
If the change direction of the phase power detected by a phase current transformer is the same as the change direction of the set discharging power/charging power, and the change value of the phase power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power, the phase ammeter is indicated to be in positive connection, at the moment, the positive connection count of the phase ammeter is added with 1, and the reverse connection count of the phase ammeter is reset.
The specific method for judging consistency is as follows: a phase power variation threshold is preset, and is typically set to 4% of the set variation value of the discharge power/charge power.
If the absolute value of the difference between the change value of the power detected by a phase current transformer and one third of the change value of the set discharging power/charging power is within the range defined by the phase power change threshold, the change direction of the power detected by the phase current transformer is the same as the change direction of the set discharging power/charging power, and the change value of the power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power.
If the change direction of the phase power detected by a phase current transformer is opposite to the change direction of the set discharging power/charging power, and the change value of the phase power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power, the phase ammeter is indicated to be reversely connected, at the moment, the reverse connection count of the phase ammeter is added with 1, and the forward connection count of the phase ammeter is reset.
The specific method for judging consistency is as follows: if the absolute value of the sum of the change value of the power detected by a phase current transformer and one third of the change value of the set discharging power/charging power is within the range defined by the phase power change threshold, the change direction of the power detected by the phase current transformer is opposite to the change direction of the set discharging power/charging power, and the change value of the power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power.
After the step of judging the upper phase ammeter, a judgment result is obtained according to the positive connection counting/negative connection counting corresponding to each phase ammeter, and the method specifically comprises the following steps: if the positive connection count of one phase of the ammeter is greater than the preset times J, and the J is a positive integer greater than 2, the connection state of the phase of the ammeter is marked as correct connection, and if the reverse connection count of one phase of the ammeter is greater than the preset times J, the connection state of the phase of the ammeter is marked as reverse connection. And if the positive connection count and the negative connection count of the one-phase ammeter do not reach the preset times J, the phase is the phase without the marked connection state.
And in the discharging/charging process, if the positive connection count of the ammeter is continuously accumulated to K, wherein K is a positive integer greater than 2, the connection state of the ammeter is judged to be correct connection.
And after finishing each time of discharging and charging, if the reverse connection count of the electric meter reaches or exceeds L and L = (M + N) × 60%, judging the connection state of the electric meter as reverse connection. If the reverse connection count of the electric meter does not reach L, the connection state of the one-phase or multi-phase electric meter which is not marked with the connection state is judged to be incorrect connection.
In the above scheme, when the three-phase energy storage system starts to discharge/charge and stably discharges/charges after a period of time delay, the total power/phase power detected by the ammeter is read.
In the above proposal, K, L is designed in consideration of the fact that the amount of change of the electricity meter is also related to the amount of electricity generated by the PV panel, and therefore, the positive or negative connection of the electricity meter cannot be determined with a single determination result. And judging that the electric meter is in a positive connection state only for K times continuously, or judging that the electric meter is in a reverse connection state when the electric meter is in a reverse connection state for more than L times in the M + N times of judgment. In other cases, the customer is prompted to check the line or re-detect the electric meter CT when other abnormalities (the electric meter is damaged or the CT is correctly buckled on the AC line) exist.
Based on the above scheme and where the value of M is 5, the value of N is 5, the value of J is 3, the value of K is 3, and L =6, the specific flow of the three-phase energy storage system electric meter current transformer connection detection method is as shown in fig. 2, and the method includes the following steps:
step 1: and (3) the electric meter enters a grid-connected mode because the electric meter only runs under the normal condition of the commercial power, and then step 2 is executed.
Step 2: judging whether the communication of the electric meter is normal or not, if so, executing the step 3: if not, returning an abnormal communication result of the ammeter, prompting to check whether the ammeter or the communication line is normal, and then returning.
And step 3: judging whether the CT detection zone bit of the electric meter is set, if so, entering a connection detection state/flow, and executing the step 4: and if not, returning.
And 4, step 4: clearing a CT connection state zone bit of the electric meter, enabling the charging and discharging power of the three-phase energy storage system to return to zero (the initial current power is set to be 0W), enabling m =0 and n =0, wherein m is the count of a discharging counter, and n is the count of a charging counter, and then executing the step 5:
and 5: and judging whether m is less than 5, if so, executing the step 6, and otherwise, executing the step 7.
Step 6: reading the total power Pmeter _ m detected by the current electric meter and the power Pmeter X, X =1, 2, 3 of the phase detected by the current phase current transformer of the electric meter, then discharging the three-phase energy storage system according to the set discharge power, and setting the discharge power of the next three-phase energy storage system to be (m + 1) × 500W, that is, in the embodiment, the preset discharge rate gradient is 500W, that is, the change value Δ Pac =500W of the discharge power set before and after each discharge, then m + +, and executing step 9.
And 7: and judging whether n is less than 5, if so, executing the step 8, and if not, executing the step 27.
And 8: reading the total power Pmeter _ n detected by the current electric meter and the power Pmeter X, X =1, 2, 3 of the phase detected by the current phase current transformer of the electric meter, then charging the three-phase energy storage system according to the set charging power, and setting the charging power of the next three-phase energy storage system to be (n + 1) × 500W, that is, in the embodiment, the preset charging rate gradient is 500W, that is, the change value Δ Pac =500W of the charging power set before and after each charging, then n + +, and executing step 9.
And step 9: waiting for a delay of 10s to stabilize the discharge/charge.
Step 10: reading the total power detected by the current electric meter, P 'meter _ m (discharging)/P' meter _ n (charging), and calculating a change value of the total power detected by the electric meter before and after the discharging, Δ Pmeter = P 'meter _ m-Pmeter _ m, or a change value of the total power detected by the electric meter before and after the charging, Δ Pmeter = P' meter _ n-Pmeter _ n. If the preset total power change threshold is 50W, whether the absolute value of the sum of the total power change value Δ Pmeter detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value Δ Pac is within the range defined by the total power change threshold 50W is judged, that is, whether Δ Pmeter + Δ Pac ≦ 50 is established is judged, if yes, step 11 is executed, and if not, step 12 is executed.
Step 11: and (4) adding 1 to the counter number of the reverse connection of the ammeter recorded by the counter of the reverse connection of the ammeter, resetting the counter number of the forward connection of the ammeter recorded by the counter of the forward connection of the ammeter, and then returning to the step 5.
Step 12: and (3) judging whether the absolute value of the difference between the total power change value delta Pmeter detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value delta Pac is within the range limited by the total power change threshold value 50W, namely judging whether delta Pmeter-delta Pac is more than or equal to 50 and less than or equal to 50, if so, executing the step 13, and if not, executing the step 16.
Step 13: the meter forward count recorded by the meter forward counter is incremented by 1 and then step 14 is performed.
Step 14: and (5) judging whether the positive connection count of the electric meter is more than 3, if so, executing the step 15, and if not, returning to the step 5.
Step 15: and judging the connection state of the electric meter as correct connection, marking the CT connection state of the electric meter as correct connection, and executing the step 30.
Step 16: let X =1, then step 17 is performed.
And step 17: reading the power P 'meterX detected by the current X-th phase current transformer, and calculating the change value delta PmeterX = P' meterX-PmeterX of the power detected by the current phase current transformer before and after the current discharging/charging. If the preset phase power change threshold is 20W, determining whether an absolute value of a difference between a power change value Δ pmetrx detected by the phase current transformer before and after discharging/charging and a third Δ Pac/3 of the set discharge power/charging power change value is within a range defined by the phase power change threshold 20W, i.e., determining whether Δ pmetrx- Δ Pac/3 is greater than or equal to-20 and less than or equal to 20, if so, executing step 18, and if not, executing step 21.
Step 18: and adding 1 to the positive connection count of the X-phase ammeter recorded by the positive connection count of the X-phase ammeter, resetting the reverse connection count of the X-phase ammeter recorded by the reverse connection counter of the X-phase ammeter, and executing the step 19.
Step 19: and (4) judging whether the positive connection count of the X-phase ammeter is greater than 3, if so, executing the step 20, and if not, executing the step 25.
Step 20: marking the connection state of the X-phase electric meter as correct connection, that is, marking the CT connection state flag position of the X-phase electric meter as correct connection, and then performing step 25.
Step 21: and (3) judging whether the absolute value of the sum of the power change value delta PmeterX detected by the phase current transformer before and after discharging/charging and one third delta Pac/3 of the set change value of the discharging power/charging power is within the range limited by the phase power change threshold value 20W, namely judging whether-20 is more than or equal to delta PmeterX + delta Pac/3 is more than or equal to 20, if so, executing the step 22.
Step 22: and adding 1 to the reverse connection count of the X-phase ammeter recorded by the reverse connection count of the X-phase ammeter, resetting the forward connection count of the X-phase ammeter recorded by the forward connection counter of the X-phase ammeter, and executing the step 23.
Step 23: and judging whether the reverse connection count of the X-phase electric meter is more than 3, if so, executing the step 24, and if not, executing the step 25.
Step 24: and marking the connection state of the X-phase electric meter as reverse connection, namely, marking the CT connection state mark position of the X-phase electric meter as reverse connection, and then executing the step 25.
Step 25: x +1, and then step 26 is performed.
Step 26: and judging whether X is more than 3, if so, returning to the step 5, and if not, returning to the step 17.
Step 27: and judging whether the reverse connection count of the electric meter is more than 6, if so, executing the step 28, and if not, executing the step 29.
Step 28: and judging the connection state of the electric meter to be reverse connection, judging the CT connection state mark position of the electric meter to be reverse connection, and executing the step 30.
Step 29: when the CT detection is overtime, the connection state of the one-phase or multi-phase electric meter not marked with the connection state is judged to be incorrect connection, the corresponding CT connection state flag position is set as incorrect connection, and then step 30 is executed.
Step 30: and (4) detecting a marker bit by CT of the electricity clearing meter, positively connecting the electricity clearing meter with the counter and reversely connecting the electricity clearing meter with the counter, and then returning.
This scheme carries out the self-checking to the ammeter function according to the inspection demand, and the connection condition of each looks ammeter of location that can be quick accurate assists the fine location problem of user, the troubleshooting to the interference that energy storage system normal work brought has not been connected to ammeter CT has been solved.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. The utility model provides a three-phase energy storage system ammeter current transformer connects detection method, is applied to in order to detect the ammeter wherein and connects whether wrong in the three-phase energy storage system, its characterized in that: the connection detection method of the three-phase energy storage system ammeter current transformer comprises the following steps:
discharging the three-phase energy storage system according to different set discharging powers in M times, and charging the three-phase energy storage system according to different set charging powers in N times, wherein M, N are positive integers greater than 4;
judging whether the change value and the change direction of the total power detected by the electric meter before and after the discharging/charging are consistent with the set change value and the change direction of the discharging power/charging power or not at each discharging/charging,
if the change direction of the total power detected by the ammeter before and after the discharging/charging is opposite to the change direction of the set discharging power/charging power, and the change value of the total power detected by the ammeter before and after the discharging/charging is consistent with the change value of the set discharging power/charging power, the reverse connection count of the ammeter is increased by 1, and the forward connection count of the ammeter is cleared;
if the change direction of the total power detected by the electric meter before and after the discharging/charging is the same as the set change direction of the discharging power/charging power, and the change value of the total power detected by the electric meter before and after the discharging/charging is consistent with the fixed change value of the discharging power/charging power, the positive counting number of the electric meter is increased by 1;
if the change direction of the total power detected by the ammeter before and after the discharging/charging is opposite to or the same as the change direction of the set discharging power/charging power, and the change value of the total power detected by the ammeter before and after the discharging/charging is not consistent with the change value of the set discharging power/charging power, whether the change value and the change direction of the phase power detected by each phase current transformer are consistent with one third and the change direction of the change value of the set discharging power/charging power is further judged;
if the change direction of the phase power detected by a phase current transformer is the same as the change direction of the set discharging power/charging power, and the change value of the phase power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power, adding 1 to the positive connection count of the phase ammeter, and resetting the reverse connection count of the phase ammeter;
if the change direction of the phase power detected by a phase current transformer is opposite to the change direction of the set discharging power/charging power, and the change value of the phase power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power, adding 1 to the counter-connection count of the phase ammeter, and resetting the counter-connection count of the phase ammeter;
if the positive connection count of one phase of the ammeter is greater than the preset number J, and J is a positive integer greater than 2, marking the connection state of the phase of the ammeter as correct connection, and if the reverse connection count of one phase of the ammeter is greater than the preset number J, marking the connection state of the phase of the ammeter as reverse connection;
in the discharging/charging process, if the positive connection count of the ammeter is continuously accumulated to K, wherein K is a positive integer greater than 2, the connection state of the ammeter is judged to be correct connection;
after finishing each discharging and charging, if the reverse connection count of the electric meter reaches or exceeds L and L = (M + N) × 60%, judging the connection state of the electric meter as reverse connection; if the reverse connection count of the electric meter does not reach L, the connection state of the one-phase or multi-phase electric meter which is not marked with the connection state is judged to be incorrect connection.
2. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 1, wherein: presetting a total power change threshold, wherein if the absolute value of the sum of the total power change value detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value is within the range limited by the total power change threshold, the change direction of the total power detected by the electric meter before and after discharging/charging is opposite to the set discharge power/charging power change direction, and the total power change value detected by the electric meter before and after discharging/charging is consistent with the set discharge power/charging power change value; if the absolute value of the difference between the total power change value detected by the electric meter before and after discharging/charging and the set discharge power/charging power change value is within the range defined by the total power change threshold, the direction of the total power change detected by the electric meter before and after discharging/charging is the same as the set discharge power/charging power change direction, and the total power change value detected by the electric meter before and after discharging/charging is consistent with the set discharge power/charging power change value.
3. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 2, wherein: the total power variation threshold is set to 10% of the set variation value of the discharging power/charging power.
4. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 1, wherein: presetting a phase power change threshold, wherein if the absolute value of the difference between the change value of the power detected by a phase current transformer and one third of the change value of the set discharging power/charging power is within the range limited by the phase power change threshold, the change direction of the power detected by the phase current transformer is the same as the change direction of the set discharging power/charging power, and the change value of the power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power; if the absolute value of the sum of the change value of the power detected by a phase current transformer and one third of the change value of the set discharging power/charging power is within the range defined by the phase power change threshold, the change direction of the power detected by the phase current transformer is opposite to the change direction of the set discharging power/charging power, and the change value of the power detected by the phase current transformer is consistent with one third of the change value of the set discharging power/charging power.
5. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 4, wherein: the phase power variation threshold is set to 4% of the set variation value of the discharge power/charge power.
6. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 1, wherein: when the three-phase energy storage system discharges, the discharging power of each time of discharging is gradually increased according to a preset discharging rate gradient; and when the three-phase energy storage system is charged, the charging power of each charging is gradually increased according to a preset charging power gradient.
7. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 1, wherein: m is 5, N is 5, J is 3, and K is 3.
8. The connection detection method for the three-phase energy storage system ammeter current transformer of claim 1, wherein: and when the three-phase energy storage system starts to discharge/charge and stably discharges/charges after a period of time delay, reading the total power/phase power detected by the electric meter.
9. The connection detection method for the three-phase energy storage system electric meter current transformer of claim 8, characterized by comprising the following steps: the delay is 10 s.
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| CN112180313B (en) * | 2020-09-02 | 2023-11-10 | 深圳市首航新能源股份有限公司 | Automatic correction method, control device and energy storage equipment for current transformer |
| CN114200347B (en) * | 2021-11-30 | 2023-07-18 | 杭州煦达新能源科技有限公司 | Method for detecting abnormal connection of battery cell voltage sampling line in energy storage system |
| CN115598581B (en) * | 2022-11-28 | 2023-03-07 | 江苏阿诗特能源科技有限公司 | Current transformer fault detection method, equipment and medium of energy storage system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081539U (en) * | 1990-10-26 | 1991-07-24 | 郑五星 | Automatic numeral type electric metering on-line detecting instrument |
| JP2012005193A (en) * | 2010-06-15 | 2012-01-05 | Fuji Electric Fa Components & Systems Co Ltd | Leakage cutoff unit and leakage detector |
| CN103163409A (en) * | 2011-12-19 | 2013-06-19 | 上海安科瑞电气股份有限公司 | Method and device used for correcting inverse current wiring of field electric instrument |
| CN104181435A (en) * | 2014-07-24 | 2014-12-03 | 苏州太谷电力股份有限公司 | Wiring error correcting method and device for three-phase four-wire energy-efficiency terminal |
| CN106569170A (en) * | 2016-11-09 | 2017-04-19 | 国网山东省电力公司临朐县供电公司 | Metering device secondary circuit detector and detection method thereof |
| CN107966630A (en) * | 2017-11-10 | 2018-04-27 | 江苏固德威电源科技股份有限公司 | Ammeter current transformer connecting detection method applied to energy-storage system |
| CN108009131A (en) * | 2017-11-30 | 2018-05-08 | 重庆电力高等专科学校 | User power utilization data exception analysis method based on power information collection |
| CN108445438A (en) * | 2018-03-23 | 2018-08-24 | 国网河北省电力有限公司电力科学研究院 | The detection method and device of false wiring of electric energy metering equipment |
| CN108462193A (en) * | 2018-02-08 | 2018-08-28 | 福州大学 | A kind of electric network coordination control method containing photovoltaic generation Yu electric vehicle charge and discharge |
| CN108646089A (en) * | 2018-06-14 | 2018-10-12 | 广东电网有限责任公司 | Electricity consumption computational methods, device and electronic equipment |
-
2019
- 2019-03-19 CN CN201910205915.9A patent/CN110045313B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081539U (en) * | 1990-10-26 | 1991-07-24 | 郑五星 | Automatic numeral type electric metering on-line detecting instrument |
| JP2012005193A (en) * | 2010-06-15 | 2012-01-05 | Fuji Electric Fa Components & Systems Co Ltd | Leakage cutoff unit and leakage detector |
| CN103163409A (en) * | 2011-12-19 | 2013-06-19 | 上海安科瑞电气股份有限公司 | Method and device used for correcting inverse current wiring of field electric instrument |
| CN104181435A (en) * | 2014-07-24 | 2014-12-03 | 苏州太谷电力股份有限公司 | Wiring error correcting method and device for three-phase four-wire energy-efficiency terminal |
| CN106569170A (en) * | 2016-11-09 | 2017-04-19 | 国网山东省电力公司临朐县供电公司 | Metering device secondary circuit detector and detection method thereof |
| CN107966630A (en) * | 2017-11-10 | 2018-04-27 | 江苏固德威电源科技股份有限公司 | Ammeter current transformer connecting detection method applied to energy-storage system |
| CN108009131A (en) * | 2017-11-30 | 2018-05-08 | 重庆电力高等专科学校 | User power utilization data exception analysis method based on power information collection |
| CN108462193A (en) * | 2018-02-08 | 2018-08-28 | 福州大学 | A kind of electric network coordination control method containing photovoltaic generation Yu electric vehicle charge and discharge |
| CN108445438A (en) * | 2018-03-23 | 2018-08-24 | 国网河北省电力有限公司电力科学研究院 | The detection method and device of false wiring of electric energy metering equipment |
| CN108646089A (en) * | 2018-06-14 | 2018-10-12 | 广东电网有限责任公司 | Electricity consumption computational methods, device and electronic equipment |
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