CN109921445B - Transformer area phase change switch control method considering branch line power balance - Google Patents
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Abstract
The invention discloses a control method of a platform area phase change switch considering branch line power balance, which comprises the steps of firstly judging whether the switch phase change operation is needed according to the three-phase unbalance degree of the current at the head end of the platform area, the distribution transformation load rate and the duration time for the three-phase unbalance degree to reach the limit value; after the phase change triggering condition is reached, calculating average phase current and maximum phase current difference, and determining the load to be transferred of each phase, wherein the positive transfer amount represents that the load needs to be transferred out, and the negative transfer amount represents that the load needs to be received; according to the phase position, the phase current and the three-phase voltage of the current switch, a switch action sequence is generated, and after the switches act in sequence, the three-phase unbalance degree at the distribution transformer outlet is improved, and the three-phase unbalance problem of the branch line can be effectively improved. The invention takes the unbalance degree of the three-phase current of the distribution transformer as a main phase change criterion and takes the three-phase voltage measurement value at the phase change switch as an auxiliary criterion, thereby solving the problem of three-phase unbalance at the outlet of the distribution transformer and simultaneously improving the problem of branch line unbalance.
Description
Technical Field
The invention relates to the technical field of distribution networks, in particular to a method for controlling a phase change switch of a distribution room in consideration of branch line power balance.
Background
The urban and rural distribution network adopts three-phase four-wire system distribution transformer more, and single-phase load accounts for than big, and power supply department is when overall arrangement power supply region single-phase user, generally according to user quantity to A, B, C three-phase equipartition, nevertheless still can have serious three-phase unbalanced load phenomenon in the actual work, and the leading reason is because: 1) three-phase load imbalance can be caused by different load capacities among users; 2) although the load capacity is the same among users, the electricity utilization time is asynchronous, and three-phase load imbalance can be caused; 3) uncontrollable high-power loads such as air conditioners, induction cookers and the like are connected, the capacity of a single load is mostly hundreds of watts to thousands of watts, and the single-phase power supply is mostly adopted, so that the three-phase load imbalance is also caused.
When three-phase load is unbalanced, neutral point potential will shift, and circuit voltage drop and power loss will greatly increase, can cause the load heavy phase circuit end to appear low voltage phenomenon, serious area causes domestic appliance unable normal work. And the single-phase user of the light phase of load has the problem of high voltage, which affects the service life of the equipment. The maximum allowable output of the distribution transformer is limited by the rated capacity of each phase, and when the distribution transformer operates under the three-phase load unbalance working condition, one phase with light load has surplus capacity, so that the output of the distribution transformer is reduced. Therefore, the three-phase unbalance problem of the platform area needs to be solved.
The existing solutions to the problem of three-phase imbalance mainly comprise two types of load phase change and additional compensation devices. The load commutation is divided into manual phase modulation and automatic commutation. Manual commutation needs to carry out a large amount of preparation work, and is inefficient, time-consuming and labor-consuming, and the human cost is higher, and because the load has randomness and volatility, artifical phase modulation is difficult to adapt to the change of load moreover. The automatic commutation is realized mainly by a commutation switch, the commutation time can reach within 10ms, and the commutation without power failure of a user is realized. The additional unbalanced compensation device realizes three-phase balance at the distribution transformer outlet by performing reactive compensation on unbalanced three-phase load. However, the existing automatic phase-change switch and the additional compensation device can only solve the problem of three-phase imbalance at the outlet of the distribution transformer, improve the self problem of the distribution transformer to a certain extent, and cannot solve the problem of three-phase load imbalance of a low-voltage line of a distribution substation area.
Disclosure of Invention
In order to overcome at least one of the above-mentioned drawbacks of the prior art, the present invention provides a method for controlling a phase-change switch in a cell in consideration of power balance of branch lines.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for controlling a phase-change switch of a transformer area in consideration of power balance of branch lines comprises the following steps:
s1: reading voltage and current data at the distribution transformer outlet at fixed time, and calculating the unbalance degree of the three-phase current and the distribution transformer load rate;
s2: periodically judging whether the trigger condition of the switch phase change is reached, if so, performing step S3, and if not, performing step S1;
s3: calculating three-phase average current and each phase unbalanced current, and determining a load transfer-out phase and a load transfer-in phase; the step S3 specifically includes a step S31 and a step S32:
s 31: calculating the average current of three phases as IavPhase A unbalance Current Delta IaB-phase unbalance current Δ IbC-phase unbalance current Delta Ic：
Iav＝(Ia+Ib+Ic)/3
ΔIa＝Ia-Iav
ΔIb＝Ib-Iav
ΔIc＝Ic-Iav
Wherein, IaFor phase A current, IbFor phase B current, IcIs C phase current;
s 32: determining an adjustment strategy of the load adjustment direction and the adjustment amount according to the calculated unbalanced current of each phase in the step s31, wherein the adjustment strategy is as follows:
if Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib>0、ΔIc<0; the load adjustment direction is shifted from A to C phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the B phase to the C phase by a load shift amount of | Δ Ib|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib<0、ΔIc>0; the load adjustment direction is shifted from A phase to B phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the C phase to the B phase by a load shift amount of | Δ Ic|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib<0、ΔIc<0; the load adjustment direction is shifted from A phase to B phase by a load shift amount of | Δ IbL, |; the load adjustment direction is shifted from the A phase to the C phase by a load shift amount of | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen is Δ Ia>0、ΔIc<0; the load adjustment direction is shifted from A phase to C phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the B phase to the C phase by a load shift amount of | Δ Ib|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen is Δ Ia<0、ΔIc>0; the load adjustment direction is shifted from the B phase to the A phase by a load shift amount of | Δ IbL, |; the load adjusting direction is from C phase to A phaseLine shifting with load shifting amount of | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen is Δ Ia<0、ΔIc<0; the load adjustment direction is shifted from the B phase to the A phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the B phase to the C phase by a load shift amount of | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen is Δ Ia>0、ΔIb<0; the load adjustment direction is shifted from A phase to B phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the C phase to the B phase by a load shift amount of | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen is Δ Ia<0、ΔIb>0; the load adjustment direction is shifted from the B phase to the A phase by a load shift amount of | Δ IbL, |; the load adjustment direction is shifted from the C phase to the A phase by a load shift amount of | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen is Δ Ia<0、ΔIb<0; the load adjustment direction is shifted from phase C to phase A by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the C phase to the B phase by a load shift amount of | Δ Ib|；
S4: reading information of a phase change switch, and acquiring information of the current phase, phase current, the current day action times of the switch, the last action time and the like of the switch to form a switch queue;
s5: rejecting the non-operable switches to form an operable switch queue;
s6: forming a commutation switch action sequence according to the adjustment strategy in the step s32, issuing a remote control command to the commutation switch and checking the strategy, and if the unbalance of the three phases after the commutation switch is adjusted is improved by less than 2 percent compared with the unbalance before the control, not carrying out the commutation operation;
s7: inquiring whether the phase change switch is successfully executed, and if not, successfully executing the step S8, otherwise, turning to the step S9;
s8: recording the serial number, phase change and current information of the action switch;
s9: the remote control command is sent again, the step S7 is carried out, and if the remote control command fails to be executed for 2 times, the step S10 is carried out;
s10: and sending execution failure alarm information.
Preferably, the triggering condition is that the unbalance degree of the three-phase current in the period exceeds a limit value gamma and the single-phase load rate exceeds a limit value beta for a specified time. The trigger condition considers the load rate and the unbalance factor at the same time, and the two factors need to reach respective limit values at the same time to be counted as effective counting.
Preferably, the non-operable switch refers to a switch with the voltage of the current phase being greater than the average voltage of three phases at the switch, a switch with the number of actions exceeding the limit on the day, or a switch with the current time and the last action time of the switch being less than the action interval.
Preferably, the action interval refers to the shortest time between two adjacent actions of the switch.
Preferably, when there are 2-phase unbalanced current loads with the same sign, the adjustment strategy preferentially adjusts the phase with the larger absolute value of the unbalanced current, such as Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib<0、ΔIc<0；|ΔIb|>|ΔIcI, adjust A → B first and then A → C.
Compared with the prior art, the beneficial effects are:
the invention discloses a control strategy of a transformer area phase change switch considering branch line power balance, which aims at the current situation that the existing measures for treating the three-phase unbalance problem of a transformer area can only improve the unbalance problem of the transformer area to a certain extent but cannot treat the three-phase load unbalance problem of a low-voltage line of the transformer area.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a diagram of an embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1
Fig. 1 to 2 show a first embodiment of the present invention, and a method for controlling a phase-change switch of a cell in consideration of power balance of branch lines includes the following steps:
s1: reading voltage and current data at the distribution transformer outlet at fixed time, and calculating the unbalance degree of the three-phase current and the distribution transformer load rate;
s2: periodically judging whether the trigger condition of the switch phase change is reached, if so, performing step S3, and if not, performing step S1;
s3: calculating three-phase average current and each phase unbalanced current, and determining a load transfer-out phase and a load transfer-in phase; step S3 mainly includes step S31 and step S32:
s 31: calculating the average current of three phases as IavPhase A unbalance Current Delta IaB-phase unbalance current Δ IbC-phase unbalance current Delta Ic：
Iav＝(Ia+Ib+Ic)/3
ΔIa＝Ia-Iav
ΔIb＝Ib-Iav
ΔIc＝Ic-Iav
Wherein, IaFor phase A current, IbFor phase B current, IcIs C phase current;
s 32: determining the adjustment strategy of the load adjustment direction and the adjustment amount according to the unbalanced current of each phase calculated in s31, which is detailed in table 1:
s4: reading information of a phase change switch, and acquiring information of the current phase, phase current, the current day action times of the switch, the last action time and the like of the switch to form a switch queue;
s5: rejecting the non-operable switches to form an operable switch queue;
s6: forming a commutation switch action sequence according to the adjustment strategy in the step s32, issuing a remote control command to the commutation switch and checking the strategy, and if the unbalance of the three phases after the commutation switch is adjusted is improved by less than a set value compared with the unbalance before the commutation switch is controlled, not performing commutation operation;
s7: inquiring whether the phase change switch is successfully executed, and if not, successfully executing the step S8, otherwise, turning to the step S9;
s8: recording the serial number, phase change and current information of the action switch;
s9: the remote control command is sent again, the step S7 is carried out, and if the remote control command fails to be executed for 2 times, the step S10 is carried out;
s10: and sending execution failure alarm information.
TABLE 1 load balance Shift adjustment strategy
To further explain the method, the actual data of a certain area is taken as an example for explanation, and the steps are as follows:
step S1: and reading data, and calculating the three-phase unbalance degree and the load rate. For the sake of simplifying the calculation, assuming that the measured information is not changed, the distribution variable capacity SN is 200 kVA.
Terminal measurement value: Ua-220.5V, Ia-80.0A, Ub-220.7V, Ib-60.0A, Uc-220.8V, Ic-55.0A. The switch measurement information is shown in table 2:
TABLE 2 phase change switch measuring information table
Phase a loading rate (220.5 × 80.0)/(200 × 1000/3) ═ 26.5%
Phase B loading ratio (220.7 × 60.0)/(200 × 1000/3) ═ 19.9%
C-phase loading rate (220.8 × 55.0)/(200 × 1000/3) ═ 18.2%
Step S2: and judging whether a trigger condition of switching phase change is reached. The unbalance degree of the three-phase current is 31.25 percent, which is 15 percent greater than the unbalance degree limit value of the three-phase current, the load rate of the A phase is 26.5 percent greater than the load rate limit value of the single phase by 20 percent, and the trigger condition is met because the measured data of each time are the same.
Step S3: and calculating the unbalanced current and determining the load transfer direction.
ΔIa＝Ia-Iav＝80.0-65.0＝15.0A
ΔIb＝Ib-Iav＝60.0-65.0＝-5.0A
ΔIc＝Ic-Iav＝55.0-65.0＝-10.0A
According to Table 1, the load of phase A shifts to phase B by 5A and to phase C by 10A.
Step S4: and reading the switch information to form a switch queue.
As shown in table 2, there are 5 switches, and the switch distribution is shown in fig. 2, where there are 3 switches in phase a, and the results are 2, 1, and 5 in descending order of current.
Step S5: the phase a voltage of the switch 5 is the highest, which means that the phase a load in the current branch is the lightest, and the switch 5 should not transfer the load, and the switch 5 is lifted from the switch queue.
In step S6, since it is necessary to transfer the load 5A to the B phase and the load 10A to the C phase in the a phase from step S3, the command sequence is to switch the switch 2 from the a phase to the C phase and to switch the switch 1 from the a phase to the B phase. After the phase change, the unbalance degree of the three-phase currents of the A-phase current 68A, the B-phase current 63A and the C-phase current 64A is (68-63)/68 x 100%, namely 7.4%.
Steps S7 to S10 are operation steps, and are not described herein.
The control method avoids the situations that the unbalance degree of the branch 3 is increased, the line loss is increased and the like caused by switching the switch 5 from the phase A to the phase C.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (3)
1. A method for controlling a phase-change switch of a transformer area in consideration of power balance of branch lines is characterized by comprising the following steps:
s1: reading voltage and current data at the distribution transformer outlet at fixed time, and calculating the unbalance degree of the three-phase current and the distribution transformer load rate;
s2: periodically judging whether the trigger condition of the switch phase change is reached, if so, performing step S3, and if not, performing step S1;
s3: calculating three-phase average current and each phase unbalanced current, and determining a load transfer-out phase and a load transfer-in phase; the step S3 specifically includes a step S31 and a step S32:
s 31: calculating the average current of three phases as IavPhase A unbalance Current Delta IaB-phase unbalance current Δ IbC-phase unbalance current Delta Ic：
Iav＝(Ia+Ib+Ic)/3
ΔIa＝Ia-Iav
ΔIb＝Ib-Iav
ΔIc＝Ic-Iav
Wherein, IaFor phase A current, IbFor phase B current, IcIs C phase current;
s 32: determining an adjustment strategy of the load adjustment direction and the adjustment amount according to the calculated unbalanced current of each phase in the step s31, wherein the adjustment strategy is as follows:
if Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib>0、ΔIc<0; the load adjustment direction is shifted from A to C phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the B phase to the C phase by a load shift amount of | Δ Ib|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib<0、ΔIc>0; the load adjustment direction is shifted from A phase to B phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the C phase to the B phase by a load shift amount of | Δ Ic|；
If Δ Ia>ΔIbAnd Δ Ia>ΔIcWhen is Δ Ib<0、ΔIc<0; the load adjusting direction is opposite to the A directionThe B phase is transferred, and the load transfer amount is | Delta IbL, |; the load adjustment direction is shifted from the A phase to the C phase by a load shift amount of | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen is Δ Ia>0、ΔIc<0; the load adjustment direction is shifted from A phase to C phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the B phase to the C phase by a load shift amount of | Δ Ib|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen is Δ Ia<0、ΔIc>0; the load adjustment direction is shifted from the B phase to the A phase by a load shift amount of | Δ IbL, |; the load adjustment direction is shifted from the C phase to the A phase by a load shift amount of | Δ Ic|；
If Δ Ib>ΔIaAnd Δ Ib>ΔIcWhen is Δ Ia<0、ΔIc<0; the load adjustment direction is shifted from the B phase to the A phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the B phase to the C phase by a load shift amount of | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen is Δ Ia>0、ΔIb<0; the load adjustment direction is shifted from A phase to B phase by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the C phase to the B phase by a load shift amount of | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen is Δ Ia<0、ΔIb>0; the load adjustment direction is shifted from the B phase to the A phase by a load shift amount of | Δ IbL, |; the load adjustment direction is shifted from the C phase to the A phase by a load shift amount of | Δ Ic|；
If Δ Ic>ΔIaAnd Δ Ic>ΔIbWhen is Δ Ia<0、ΔIb<0; the load adjustment direction is shifted from phase C to phase A by a load shift amount of | Δ IaL, |; the load adjustment direction is shifted from the C phase to the B phase,load transfer amount is | Δ Ib|；
S4: reading information of a phase change switch, and acquiring current phase, phase current, the current day action times of the switch and the last action time information of the switch to form a switch queue;
s5: rejecting the non-operable switches to form an operable switch queue;
s6: forming a commutation switch action sequence according to the adjustment strategy in the step s32, issuing a remote control command to the commutation switch and checking the strategy, and if the unbalance of the three phases after the commutation switch is adjusted is improved by less than 2 percent compared with the unbalance before the control, not carrying out the commutation operation;
s7: inquiring whether the phase change switch is successfully executed, and if not, successfully executing the step S8, otherwise, turning to the step S9;
s8: recording the serial number, phase change and current information of the action switch;
s9: the remote control command is sent again, the step S7 is carried out, and if the remote control command fails to be executed for 2 times, the step S10 is carried out;
s10: sending execution failure alarm information;
in the step S2, the triggering condition is that the unbalance of the three-phase currents in the period exceeds the limit value γ and the single-phase load rate exceeds the limit value β for a specified time.
2. The method of claim 1, wherein the method comprises: in step S5, the inoperable switch refers to a switch whose current phase voltage is greater than the average voltage of three phases at the switch, a switch whose number of actions on the day is out of limit, or a switch whose current time and last action time are less than the action interval.
3. The method of claim 2, wherein the step of controlling the phase-change switch comprises the steps of: the action interval refers to the shortest time between two adjacent actions of the switch.
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| CN110716091A (en) * | 2019-11-27 | 2020-01-21 | 国网冀北电力有限公司电力科学研究院 | Three-phase unbalance on-line monitoring method based on four-stage balance phase modulation algorithm |
| CN111162548B (en) * | 2020-01-03 | 2022-03-08 | 深圳供电局有限公司 | Commutation switch control method based on general branch control mode |
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