CN108206526B - Capacitor switching partition control method and device - Google Patents

Capacitor switching partition control method and device Download PDF

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Publication number
CN108206526B
CN108206526B CN201810059362.6A CN201810059362A CN108206526B CN 108206526 B CN108206526 B CN 108206526B CN 201810059362 A CN201810059362 A CN 201810059362A CN 108206526 B CN108206526 B CN 108206526B
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phase
value
voltage
compensation
preset
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CN108206526A (en
Inventor
刘超
陈天锦
韩海伦
曹智慧
于文杰
马骏
陈世锋
于浩然
李新元
胡明珠
陈松伟
董鹤
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Xuji Group Co Ltd
XJ Electric Co Ltd
Xuji Power Co Ltd
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Xuji Group Co Ltd
XJ Electric Co Ltd
Xuji Power 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention provides a capacitor switching partition control method and device, which are characterized in that each phase of a three-phase bus is partitioned according to the voltage value and the reactive compensation quantity of each phase, then a capacitor switching control method is formulated according to the section of each phase, and the partition compensation capacitors of the corresponding phases are switched preferentially, so that three-phase imbalance is avoided. When all sub-compensation capacitors of a certain phase are put into or switched, if the phase can not be in an ideal working interval, switching is carried out on the common compensation capacitor; since all the sub-compensation capacitors of the phase are put into or cut off at this time, the difference between the voltages of the three phases is minimized at this time, and the probability of occurrence of three-phase imbalance is reduced.

Description

Capacitor switching partition control method and device
Technical Field
The invention belongs to the technical field of reactive compensation control of a power system, and particularly relates to a capacitor switching partition control method and device.
Background
The power output by the power grid comprises two parts; firstly, active power; second, reactive power. Directly consuming electric energy, converting the electric energy into mechanical energy, heat energy, chemical energy or sound energy, utilizing the energy to do work, and the part of power is called active power; the energy is converted into another form of energy as a necessary condition for electric equipment to work without consuming electric energy, and the energy is periodically converted into electric energy in a power grid, and the part of power is called reactive power, such as electric energy occupied by an electromagnetic element establishing a magnetic field and electric energy occupied by a capacitor establishing an electric field.
When the current does work in the inductive element, the current lags the voltage by 90 °, and when the current does work in the capacitor element, the current leads the voltage by 90 °. In the same circuit, the inductor current and the capacitor current are opposite in direction and different by 180 degrees. If the capacitor element is proportionally installed in the electromagnetic element circuit, the currents of the capacitor element and the electromagnetic element cancel each other, and the included angle between the current vector and the voltage vector is reduced. The device with capacitive power load and inductive power load are connected in parallel in the same circuit, and energy is exchanged between the two loads. In this way, the reactive power required by the inductive load can be compensated by the reactive power output by the capacitive load.
Reactive power compensation, also called reactive compensation for short, plays a role in improving the power factor of the power grid in the power supply system, can reduce the loss of a power supply transformer and a transmission line, improves the power supply efficiency, improves the power supply environment, reasonably selects a compensation device, can reduce the loss of the power grid to the maximum extent, and improves the quality of the power grid.
In the conventional reactive power compensation device, a group of compensation capacitors is arranged in a circuit, and as shown in fig. 1, the compensation capacitor arranged independently on each phase is a sub-compensation capacitor and is used for performing reactive power compensation on the corresponding phase independently; the compensation capacitor arranged between the three phases is a common compensation capacitor and is used for carrying out reactive compensation on the three phases simultaneously. The voltage of the three-phase bus can be adjusted by controlling the switching of the partial compensation capacitor and the common compensation capacitor. When the voltage of the three-phase bus is adjusted by adopting the branch compensation capacitor or the common compensation capacitor, the problem of unbalanced three-phase voltage is likely to be caused.
Disclosure of Invention
The invention provides a capacitor switching partition control method and device, which are used for solving the problem of unbalanced three-phase voltage caused by switching of a branch compensation capacitor or a common compensation capacitor.
A capacitor switching partition control method comprises the following steps:
according to the voltage upper limit value and the voltage lower limit value of each phase of the three-phase bus, and the under-compensation preset value and the over-compensation preset value of the reactive compensation quantity of the three-phase bus, partitioning according to the following conditions:
interval 1: the voltage value of the phase is greater than the voltage value of the phase, and the reactive compensation quantity is smaller than the under-compensation preset value;
interval 2 a: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is smaller than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 2 b: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is greater than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 3: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an under-compensation preset value and smaller than an over-compensation preset value;
interval 4: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an over-compensation preset value;
interval 5 a: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value of the phase and the preset lower voltage limit value is smaller than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 5 b: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value and the preset lower voltage limit value is larger than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 6: the voltage value of the phase is greater than a preset upper limit value of voltage, and the reactive compensation quantity is greater than an under-compensation preset value and less than the preset upper limit value of voltage;
interval 7: the voltage value of the phase is between a preset voltage lower limit value and a preset voltage upper limit value; the reactive compensation amount is between an over-compensation preset value and an under-compensation preset value;
detecting the section of each phase of the three-phase bus, and judging whether the branch compensation capacitor which is put into a certain phase is smaller than the branch compensation circuit number of the phase when the certain phase is in the section 3 or the section 4; if the phase is smaller than the reference value, the sub-compensation capacitor of the phase is put into use; otherwise, putting a common compensation capacitor of the three-phase bus;
when a certain phase is in a section 1 or a section 6, judging whether a sub-compensation capacitor which is input by the phase with the overhigh voltage is more than or equal to 1; if the phase is larger than or equal to the reference value, cutting off the sub-compensation capacitor of the phase; otherwise, cutting off the common compensation capacitor of the three-phase bus.
When the voltage value of a certain phase in a three-phase bus is too small or too large, the branch compensation capacitor of the phase is switched first, and other phases have no action, so that three-phase imbalance is avoided. After all sub-compensation capacitors of the phase are put into or switched, if the voltage value of the phase is still too small or too large, the common compensation capacitor is switched; since all the sub-compensation capacitors of the phase are put into or cut off at this time, the difference between the voltages of the three phases is minimized at this time, and the probability of occurrence of three-phase imbalance is reduced.
Further, when a certain phase of the three-phase bus is in the interval 2b, a sub-compensation capacitor of the phase is put into; when a certain phase of the three-phase bus is in the interval 5b, cutting off a sub-compensation capacitor of the phase; when a certain phase of the three-phase bus is in the interval 2a, the interval 5a or the interval 7, no switching action is performed.
When a certain phase in the three-phase bus is in the interval 7, the three-phase bus is in the optimal working state, so that the switching action is not required to be executed; when a certain phase in the three-phase bus is in the interval 2a and the interval 5a, in order to avoid the oscillation caused by switching the capacitor, the switching action is not executed; when a certain phase of the three-phase bus is in the interval 2b, the phase is in an under-compensation state, and when the certain phase of the three-phase bus is in the interval 5b, the phase is in an over-compensation state, so that the two intervals only switch the sub-compensation capacitor of the phase, and the three-phase imbalance is prevented.
Further, when the phase is in the interval 3 or 4 after the common compensation capacitors of the three-phase bus are all put into common compensation, a warning that the phase voltage is too low is sent out.
Further, when the common compensation capacitors of the three-phase bus are all cut off, and the phase is in the interval 1 or the interval 6, a warning that the phase voltage is too high is sent out.
A capacitor switching partition control device comprises a processor;
the processor is used for partitioning according to the upper limit value and the lower limit value of the voltage of each phase of the three-phase bus, and the under-compensation preset value and the over-compensation preset value of the reactive compensation quantity of the three-phase bus according to the following conditions:
interval 1: the voltage value of the phase is greater than the voltage value of the phase, and the reactive compensation quantity is smaller than the under-compensation preset value;
interval 2 a: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is smaller than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 2 b: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is greater than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 3: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an under-compensation preset value and smaller than an over-compensation preset value;
interval 4: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an over-compensation preset value;
interval 5 a: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value of the phase and the preset lower voltage limit value is smaller than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 5 b: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value and the preset lower voltage limit value is larger than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 6: the voltage value of the phase is greater than a preset upper limit value of voltage, and the reactive compensation quantity is greater than an under-compensation preset value and less than the preset upper limit value of voltage;
interval 7: the voltage value of the phase is between a preset voltage lower limit value and a preset voltage upper limit value; the reactive compensation amount is between an over-compensation preset value and an under-compensation preset value;
the processor is also used for detecting the section of each phase of the three-phase bus, and judging whether the branch compensation capacitor put into a certain phase is smaller than the branch compensation circuit number of the phase when the certain phase is in the section 3 or the section 4; if the phase is smaller than the reference value, the sub-compensation capacitor of the phase is put into use; otherwise, putting a common compensation capacitor of the three-phase bus;
when a certain phase is in a section 1 or a section 6, judging whether a sub-compensation capacitor which is input by the phase with the overhigh voltage is more than or equal to 1; if the phase is larger than or equal to the reference value, cutting off the sub-compensation capacitor of the phase; otherwise, cutting off the common compensation capacitor of the three-phase bus.
Further, when a certain phase of the three-phase bus is in the interval 2b, a sub-compensation capacitor of the phase is put into; when a certain phase of the three-phase bus is in the interval 5b, cutting off a sub-compensation capacitor of the phase; when a certain phase of the three-phase bus is in the interval 2a, the interval 5a or the interval 7, no switching action is performed.
Further, when the phase is in the interval 3 or 4 after the common compensation capacitors of the three-phase bus are all put into common compensation, a warning that the phase voltage is too low is sent out.
Further, when the common compensation capacitors of the three-phase bus are all cut off, and the phase is in the interval 1 or the interval 6, a warning that the phase voltage is too high is sent out.
Drawings
FIG. 1 is a schematic diagram of partial and co-complementation;
fig. 2 is a diagram of a capacitor switching partition in the method embodiment 1, and is also a diagram of a capacitor switching partition in the method embodiment 2;
fig. 3 is a control flow chart of switching the capacitor when the single-phase voltage is too low in the method embodiment 1;
fig. 4 is a control flowchart of switching the capacitor when the single-phase voltage is too high in method embodiment 2.
Detailed Description
The invention provides a capacitor switching partition control method and device, which are used for solving the problem of unbalanced three-phase voltage caused by adopting a branch compensation capacitor or a common compensation capacitor to regulate the voltage of a three-phase bus.
A capacitor switching partition control method comprises the following steps:
according to the voltage upper limit value and the voltage lower limit value of each phase of the three-phase bus, and the under-compensation preset value and the over-compensation preset value of the reactive compensation quantity of the three-phase bus, partitioning according to the following conditions:
interval 1: the voltage value of the phase is greater than the voltage value of the phase, and the reactive compensation quantity is smaller than the under-compensation preset value;
interval 2 a: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is smaller than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 2 b: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is greater than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 3: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an under-compensation preset value and smaller than an over-compensation preset value;
interval 4: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an over-compensation preset value;
interval 5 a: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value of the phase and the preset lower voltage limit value is smaller than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 5 b: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value and the preset lower voltage limit value is larger than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 6: the voltage value of the phase is greater than a preset upper limit value of voltage, and the reactive compensation quantity is greater than an under-compensation preset value and less than the preset upper limit value of voltage;
interval 7: the voltage value of the phase is between a preset voltage lower limit value and a preset voltage upper limit value; the reactive compensation amount is between an over-compensation preset value and an under-compensation preset value;
detecting the section of each phase of the three-phase bus, and if a certain phase is in the section 3 or the section 4, judging whether the branch and supplement capacitor which is put into the phase is smaller than the branch and supplement circuit number of the phase; if the phase is smaller than the reference value, the sub-compensation capacitor of the phase is put into use; otherwise, putting a common compensation capacitor of the three-phase bus;
when a certain phase is in a section 1 or a section 6, judging whether a sub-compensation capacitor which is input by the phase with the overhigh voltage is more than or equal to 1; if the phase is larger than or equal to the reference value, cutting off the sub-compensation capacitor of the phase; otherwise, cutting off the common compensation capacitor of the three-phase bus.
The present invention will be described in detail with reference to the accompanying drawings.
The switching control device for the reactive compensation capacitor comprises a processor, wherein a device for detecting the voltage of a three-phase bus is connected to the processor.
The processor is used for processing data, and the specific method is as follows:
firstly, the three-phase bus is partitioned according to the voltage and reactive compensation amount of each phase, and a partition diagram is shown in fig. 2:
when the voltage value of a certain phase of the three-phase bus is greater than UHAnd the reactive compensation amount is less than
Figure BDA0001554838950000061
When it is determined that the phase is in the section 1；
When the voltage value of a certain phase of the three-phase bus is greater than UHAnd the reactive compensation amount is larger than
Figure BDA0001554838950000062
Is less than
Figure BDA0001554838950000063
If so, judging that the phase is in the interval 6;
when the voltage value of a certain phase of the three-phase bus is less than ULAnd the reactive compensation amount is larger than
Figure BDA0001554838950000064
Is less than
Figure BDA0001554838950000065
If so, judging that the phase is in the interval 3;
when the voltage value of a certain phase of the three-phase bus is less than ULAnd when the reactive compensation amount is larger than the reactive compensation amount
Figure BDA0001554838950000066
If yes, judging that the phase is in the interval 4;
when the voltage value of a certain phase of the three-phase bus is greater than ULAnd is less than UHAnd the reactive compensation amount of the phase is less than
Figure BDA0001554838950000067
The method comprises the following steps:
if the voltage value of the phase is equal to UHThe difference between them is less than delta U1Judging that the phase is in the interval 2 a;
if the voltage value of the phase is equal to UHThe difference between them is greater than delta U1Judging that the phase is in the interval 2 b;
when the voltage value of a certain phase of the three-phase bus is greater than ULAnd is less than UHAnd the reactive compensation amount of the phase is larger than
Figure BDA0001554838950000068
The method comprises the following steps:
if the voltage value of the phase is equal to ULThe difference between them is less than delta U2Judging that the phase is in the interval 5 a;
if the voltage value of the phase is equal to ULThe difference between them is greater than delta U2Judging that the phase is in the interval 5 b;
when the voltage value of a certain phase of the three-phase bus is greater than ULAnd is less than UHAnd the reactive compensation amount is less than
Figure BDA0001554838950000069
Is greater than
Figure BDA00015548389500000610
If so, it is determined that the phase is in the interval 7.
The U isLPresetting a lower limit value for the voltage, UHAn upper limit value is preset for the voltage,
Figure BDA00015548389500000611
the default value is not compensated for,
Figure BDA00015548389500000612
to over-compensate for the preset value, Δ U1Is a first preset value, Δ U2Is the second preset value.
Then detecting the voltage and current of the three-phase bus and judging the interval of each phase;
when a certain phase of the three-phase bus is in an interval 7, the phase is in an ideal interval, and switching actions are not carried out on the branch compensation capacitor and the common compensation capacitor;
when a certain phase of the three-phase bus is in the interval 2a, in order to avoid switching oscillation, switching actions are not carried out on the sub-compensation capacitor and the common-compensation capacitor;
when a certain phase of the three-phase bus is in the interval 5a, in order to avoid switching oscillation, switching actions are not carried out on the sub-compensation capacitor and the common-compensation capacitor;
when a certain phase of the three-phase bus is in the interval 2b, a sub-compensation capacitor of the phase is put into;
when a certain phase of the three-phase bus is in the interval 5b, cutting off a sub-compensation capacitor of the phase;
when the voltage of a certain phase of the three-phase bus is in the interval 3 or the interval 4, and if the phase a in the three-phase bus is in the interval 3 or the interval 4, the flow chart for adjusting the phase voltage of the phase a is shown in fig. 3, and the steps are as follows:
(1) judging whether the number of the sub-compensation capacitors for A-phase input compensation is less than the number of sub-compensation circuits;
if the sum of the input compensation of the A phase and the input compensation of the A phase is less than the sum of the input compensation of the A phase and the input compensation of the A phase, the number of the input compensation capacitors of the A phase is increased by one, namely the input compensation capacitors of the A phase are increased;
otherwise, entering the next step;
(2) judging whether the number of the common compensation circuits of the three-phase bus is less than the number of the common compensation circuits;
if the total compensation quantity is less than the total compensation quantity, the total compensation quantity is increased by one, namely the quantity of the total compensation capacitors is increased;
otherwise, entering the next step;
(3) and sending an alarm of the condition that the A phase voltage is too low.
When the voltage of a certain phase of the three-phase bus is in the interval 1 or the interval 6, and if the phase a in the three-phase bus is in the interval 1 or the interval 6, the flow chart for adjusting the phase voltage of the phase a is shown in fig. 4, and the steps are as follows:
(1) judging whether the number of the sub-compensation capacitors for A phase input compensation is more than or equal to 1;
if the number of the added compensation capacitors of the A phase is larger than or equal to the number of the added compensation capacitors of the A phase, the number is reduced by one, namely one added compensation capacitor of the A phase is cut off;
otherwise, entering the next step;
(2) judging whether the input co-complement number of the three-phase bus is more than or equal to 1;
if the number of the common compensation capacitors is larger than or equal to the number of the common compensation capacitors, the number of the common compensation capacitors is reduced by one, and then a group of the common compensation capacitors is cut off;
otherwise, entering the next step;
(3) and sending an alarm of overhigh A-phase voltage.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.

Claims (6)

1. A capacitor switching partition control method is characterized by comprising the following steps:
(1) according to the voltage upper limit value and the voltage lower limit value of each phase of the three-phase bus, and the under-compensation preset value and the over-compensation preset value of the reactive compensation quantity of the three-phase bus, partitioning according to the following conditions:
interval 1: the voltage value of the phase is greater than a preset voltage upper limit value, and the reactive compensation quantity is smaller than an under-compensation preset value;
interval 2 a: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is smaller than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 2 b: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is greater than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 3: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an under-compensation preset value and smaller than an over-compensation preset value;
interval 4: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an over-compensation preset value;
interval 5 a: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value of the phase and the preset lower voltage limit value is smaller than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 5 b: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value and the preset lower voltage limit value is larger than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 6: the voltage value of the phase is greater than a preset upper limit value of voltage, and the reactive compensation quantity is greater than an under-compensation preset value and less than the preset upper limit value of voltage;
interval 7: the voltage value of the phase is between a preset voltage lower limit value and a preset voltage upper limit value; the reactive compensation amount is between an over-compensation preset value and an under-compensation preset value;
(2) detecting the section of each phase of the three-phase bus, and judging whether the branch compensation capacitor which is put into a certain phase is smaller than the branch compensation circuit number of the phase when the certain phase is in the section 3 or the section 4; if the phase is smaller than the reference value, the sub-compensation capacitor of the phase is put into use; otherwise, putting a common compensation capacitor of the three-phase bus;
when a certain phase is in a section 1 or a section 6, judging whether a sub-compensation capacitor which is input by the phase with the overhigh voltage is more than or equal to 1; if the phase is larger than or equal to the reference value, cutting off the sub-compensation capacitor of the phase; otherwise, cutting off the common compensation capacitor of the three-phase bus;
when a certain phase of the three-phase bus is in the interval 2b, a sub-compensation capacitor of the phase is put into; when a certain phase of the three-phase bus is in the interval 5b, cutting off a sub-compensation capacitor of the phase; when a certain phase of the three-phase bus is in the interval 2a, the interval 5a or the interval 7, no switching action is performed.
2. The method for capacitor switching partition control according to claim 1, wherein when all the common compensation capacitors of the three-phase bus are put into common compensation, and the phase is in a section 3 or a section 4, a warning that the phase voltage is too low is issued.
3. The method for capacitor switching partition control according to claim 1, wherein when all the complementary capacitors of the three-phase bus are cut off, and the phase is in a section 1 or a section 6, a warning that the phase voltage is too high is issued.
4. A capacitor switching partition control device is characterized by comprising a processor;
the processor is used for partitioning according to the upper limit value and the lower limit value of the voltage of each phase of the three-phase bus, and the under-compensation preset value and the over-compensation preset value of the reactive compensation quantity of the three-phase bus according to the following conditions:
interval 1: the voltage value of the phase is greater than a preset voltage upper limit value, and the reactive compensation quantity is smaller than an under-compensation preset value;
interval 2 a: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is smaller than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 2 b: the voltage value of the phase is greater than a preset voltage lower limit value, the difference value between the voltage value of the phase and the preset voltage upper limit value is greater than a first preset value, and the reactive compensation quantity of the phase is smaller than an under-compensation preset value;
interval 3: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an under-compensation preset value and smaller than an over-compensation preset value;
interval 4: the voltage value of the phase is smaller than a preset voltage lower limit value, and the reactive compensation quantity is larger than an over-compensation preset value;
interval 5 a: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value of the phase and the preset lower voltage limit value is smaller than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 5 b: the voltage value of the phase is smaller than a preset upper voltage limit value, the difference value between the voltage value and the preset lower voltage limit value is larger than a second preset value, and the reactive compensation quantity of the phase is larger than an over-compensation preset value;
interval 6: the voltage value of the phase is greater than a preset upper limit value of voltage, and the reactive compensation quantity is greater than an under-compensation preset value and less than the preset upper limit value of voltage;
interval 7: the voltage value of the phase is between a preset voltage lower limit value and a preset voltage upper limit value; the reactive compensation amount is between an over-compensation preset value and an under-compensation preset value;
the processor is also used for detecting the section of each phase of the three-phase bus, and judging whether the branch compensation capacitor put into a certain phase is smaller than the branch compensation circuit number of the phase when the certain phase is in the section 3 or the section 4; if the phase is smaller than the reference value, the sub-compensation capacitor of the phase is put into use; otherwise, putting a common compensation capacitor of the three-phase bus;
when a certain phase is in a section 1 or a section 6, judging whether a sub-compensation capacitor which is input by the phase with the overhigh voltage is more than or equal to 1; if the phase is larger than or equal to the reference value, cutting off the sub-compensation capacitor of the phase; otherwise, cutting off the common compensation capacitor of the three-phase bus;
when a certain phase of the three-phase bus is in the interval 2b, a sub-compensation capacitor of the phase is put into; when a certain phase of the three-phase bus is in the interval 5b, cutting off a sub-compensation capacitor of the phase; when a certain phase of the three-phase bus is in the interval 2a, the interval 5a or the interval 7, no switching action is performed.
5. The capacitor switching partition control device according to claim 4, wherein when all the common compensation capacitors of the three-phase bus are in common compensation, and the phase is in a section 3 or a section 4, a warning that the phase voltage is too low is issued.
6. The capacitor switching partition control device according to claim 4, wherein when all the complementary capacitors of the three-phase bus are cut off, and the phase is in the interval 1 or the interval 6, a warning that the phase voltage is too high is issued.
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