CN108092276B - Low-voltage line voltage reactive compensation control device - Google Patents

Low-voltage line voltage reactive compensation control device Download PDF

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CN108092276B
CN108092276B CN201810024444.7A CN201810024444A CN108092276B CN 108092276 B CN108092276 B CN 108092276B CN 201810024444 A CN201810024444 A CN 201810024444A CN 108092276 B CN108092276 B CN 108092276B
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CN108092276A (en
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赵庆春
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Shanghai Chico Electromechanical Equipment Engineering Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks

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Abstract

A low-voltage line voltage reactive compensation control device comprises a shell fixedly connected with a mounting bracket and a low-voltage line split-phase automatic voltage regulating device arranged in the shell; the automatic voltage-regulating device for the low-voltage line split-phase comprises an A-phase voltage-regulating compensation module, a B-phase voltage-regulating compensation module and a C-phase voltage-regulating compensation module, wherein the A-phase voltage-regulating compensation module is installed between an A-phase line and a zero line, the B-phase voltage-regulating compensation module is installed between the B-phase line and the zero line, the C-phase voltage-regulating compensation module is installed between the C-phase line and the zero line, the A-phase voltage-regulating compensation module, the B-phase voltage-regulating compensation module and the C-phase voltage-regulating compensation module are. The problems that the current is large and the automatic control switch is difficult to match can be effectively solved, and load balance can be realized.

Description

Low-voltage line voltage reactive compensation control device
Technical Field
The invention relates to a reactive power compensation device, in particular to a low-voltage line voltage reactive power compensation control device.
Background
The large voltage fluctuation or low voltage and long low-voltage power supply line of the high-voltage side of the distribution transformer at the tail end of the 10kV long power supply line can cause the large voltage fluctuation at the tail end of the low-voltage line, and the voltage fluctuation exceeds the national regulation allowable range. Load distribution and the power consumption period at the end of the low-voltage line are extremely uneven again, and three-phase imbalance can be caused: the voltage deviation of each phase is large, the power factor is low, the phase is unbalanced, and split-phase intelligent control on voltage and reactive power is urgently needed.
The reactive intelligent control device for the low-voltage line voltage has 2 difficulties which need to be solved:
1. the current is large, and the automatic control switch is difficult to match. The standard voltage values of the low-voltage line are 400V of three-phase line and 231V of single-phase line, so that the bus current is determined to be large. Three-phase 30kVA is taken as an example: the rated output current of the low-voltage side is 43.3A. When limited by power consumption, size, installation position, use environment and the like and needs frequent actions, a proper switch is difficult to select for matching use under the current conditions.
2. The load is unbalanced, and voltage and reactive power need to be adjusted in a split-phase mode. The load distribution of the low-voltage distribution line is uneven, the power utilization time interval is concentrated and unbalanced, and an effective means suitable for large-area popularization and application is urgently needed to realize split-phase intelligent voltage and reactive power regulation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-voltage line voltage reactive compensation control device which can effectively solve the problems of large current and difficulty in matching of an automatic control switch and can achieve balance.
In order to achieve the purpose, the technical scheme of the invention is as follows: a low-voltage line voltage reactive compensation control device comprises a shell fixedly connected with a mounting bracket and a low-voltage line split-phase automatic voltage regulating device arranged in the shell; the automatic voltage-regulating device for the low-voltage line split-phase comprises an A-phase voltage-regulating compensation module, a B-phase voltage-regulating compensation module and a C-phase voltage-regulating compensation module, wherein the A-phase voltage-regulating compensation module is installed between an A-phase line and a zero line, the B-phase voltage-regulating compensation module is installed between the B-phase line and the zero line, the C-phase voltage-regulating compensation module is installed between the C-phase line and the zero line, the A-phase voltage-regulating compensation module, the B-phase voltage-regulating compensation module and the C-phase voltage-regulating compensation module are.
The circuit structure of the A-phase voltage-regulating compensation module comprises an A-phase winding, wherein the A-phase winding and a switch K13 are connected in series between an output end of the A-phase line and a zero line, the A-phase winding consists of an A-phase series winding and an A-phase common winding which are sequentially connected in series, the A-phase common winding consists of an A-phase common winding I section, an A-phase common winding II section and an A-phase common winding III section which are sequentially connected in series, an input end of the A-phase line is connected with a node between the A-phase series winding and the A-phase common winding I section, a node between the A-phase common winding I section and the A-phase common winding II section is connected with the zero line through a switch K11, a node between the A-phase common winding II section and the A-phase common winding III section is connected with the zero line through a switch K12, a switch K13 is connected between the A-phase common winding III section and the zero line, and an output end of the A-phase line is connected with a zero line through a capacitor C36, the output end of the phase line A is connected with a zero line through a capacitor C12 and a switch KC12 which are connected in series.
The circuit structure of the B-phase voltage-regulating compensation module comprises a B-phase winding, wherein the B-phase winding is connected between the output end of a B-phase line and a zero line in series with a switch K23, the B-phase winding consists of a B-phase series winding and a B-phase common winding which are sequentially connected in series, the B-phase common winding consists of a B-phase common winding I section, a B-phase common winding II section and a B-phase common winding III section which are sequentially connected in series, the input end of the B-phase line is connected with a node between the B-phase series winding and the B-phase common winding I section, the node between the B-phase common winding I section and the B-phase common winding II section is connected with the zero line through a switch K21, the node between the B-phase common winding II section and the B-phase common winding III section is connected with the zero line through a switch K22, a switch K23 is connected between the B-phase common winding III section and the zero line, and the output end of the B-phase line is connected with a zero line through a capacitor C21, the output end of the phase B line is connected with a zero line through a capacitor C22 and a switch KC22 which are connected in series.
The circuit structure of the C-phase voltage-regulating compensation module comprises a C-phase winding, wherein the C-phase winding is connected between the output end of a C-phase line and a zero line in series with a switch K33, the C-phase winding consists of a C-phase series winding and a C-phase common winding which are sequentially connected in series, the C-phase common winding consists of a C-phase common winding I section, a C-phase common winding II section and a C-phase common winding III section which are sequentially connected in series, the input end of the C-phase line is connected with a node between the C-phase series winding and the C-phase common winding I section, a node between the C-phase common winding I section and the C-phase common winding II section is connected with the zero line through a switch K31, a node between the C-phase common winding II section and the C-phase common winding III section is connected with the zero line through a switch K32, a switch K33 is connected between the C-phase common winding III section and the zero line, and the output end of the C-phase line is connected with a zero line through a capacitor C36, the output end of the C-phase line is connected with a zero line through a capacitor C32 and a switch KC32 which are connected in series.
The switches K11, K12, K13, KC11 and KC12 are compound switches or thyristor switches.
The switches K21, K22, K23, KC21 and KC22 are compound switches or thyristor switches.
The switches K31, K32, K33, KC31 and KC32 are compound switches or thyristor switches.
The compensation capacity of the capacitors C11, C12, C21, C22, C31 and C32 is 6 kvar.
The invention has the beneficial effects that: the voltage and reactive power can be controlled in a split-phase manner, and the voltage and power factor are kept within the qualified range; the functions of remote measurement, remote signaling, remote control and remote regulation can be realized through a GPRS communication system according to the system requirements.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of an automatic split-phase voltage regulating device for a low-voltage line;
FIG. 3a is a schematic diagram of an A-phase voltage regulation compensation module;
FIG. 3B is a B-phase voltage regulation compensation module;
fig. 3C is a C-phase voltage regulation compensation module.
Wherein, 1, a shell; 2, mounting a bracket; 3, primary wire inlet holes; 4 secondary wire inlet holes.
Detailed Description
In order to better understand the technical solution of the present invention, the following description is made with reference to the accompanying drawings.
As shown in fig. 1, the low-voltage line voltage reactive compensation control device comprises a housing 1 fixed on a mounting bracket 2, a primary wire inlet hole 3 and a secondary wire inlet hole 4 are arranged on the upper side surface of the housing 1, and a low-voltage line split-phase automatic voltage regulating device is arranged inside the housing 1.
As shown in fig. 2, the automatic voltage regulating device for the low-voltage line split-phase comprises: the three single-phase voltage-regulating compensation modules are respectively arranged on the phase line A, the phase line B and the phase line C, and the single-phase voltage-regulating module is also connected with a zero line. The A-phase voltage regulation compensation module is arranged between the A-phase line and the zero line; the B-phase voltage regulating compensation module is arranged between the B-phase line and the zero line; and the C-phase voltage regulation compensation module is arranged between the C-phase line and the zero line. The A-phase voltage regulation compensation module, the B-phase voltage regulation compensation module and the C-phase voltage regulation compensation module are all controlled by a controller. The controller comprises a GPRS communication module, and the controller can be controlled by the remote controller through the GPRS communication module.
As shown in fig. 3a, the circuit structure of the a-phase voltage-regulating compensation module includes an a-phase winding, the a-phase winding is connected in series with a switch K13 between an output end of the a-phase line and a zero line, the a-phase winding is composed of an a-phase series winding and an a-phase common winding which are connected in series in sequence, the a-phase common winding is composed of an a-phase common winding i section, an a-phase common winding ii section and an a-phase common winding iii section which are connected in series in sequence, an input end of the a-phase line is connected to a node between the a-phase series winding and the a-phase common winding i section, the node between the a-phase common winding i section and the a-phase common winding ii section is connected to a zero line through a switch K11, the node between the a-phase common winding ii section and the a-phase common winding iii section is connected to a zero line through a switch K12, a switch K13 is connected between the a-phase common winding iii section and the zero line, an output end of the a-phase line, the output end of the phase line A is connected with a zero line through a capacitor C12 and a switch KC12 which are connected in series. In the figure, the terminal a is an a-phase line output terminal, a is an a-phase line input terminal, and N, n is a zero-phase line node. K11, K12, K13, KC11 and KC12 are electronic compound switches or thyristors, when the intelligent control device is used, the intelligent control device automatically detects the voltage and reactive power change of a user side of the low-voltage bus, the output voltage is controlled by controlling the K11, the K12 and the K13 to be closed or opened, and the control logic is shown in table 1.
Table 1A phase voltage regulation compensation module control logic table.
Figure 702369DEST_PATH_IMAGE001
As shown in fig. 3B, the circuit structure of the B-phase voltage-regulating compensation module includes a B-phase winding, the B-phase winding is connected in series with a switch K23 between an output end of the B-phase line and a zero line, the B-phase winding is composed of a B-phase series winding and a B-phase common winding which are connected in series in sequence, the B-phase common winding is composed of a B-phase common winding i section, a B-phase common winding ii section and a B-phase common winding iii section which are connected in series in sequence, an input end of the B-phase line is connected with a node between the B-phase series winding and the B-phase common winding i section, the node between the B-phase common winding i section and the B-phase common winding ii section is connected with the zero line through a switch K21, the node between the B-phase common winding ii section and the B-phase common winding iii section is connected with the zero line through a switch K22, a switch K23 is connected between the B-phase common winding iii section and the zero line, an output end of the B-phase line is, the output end of the phase B line is connected with a zero line through a capacitor C22 and a switch KC22 which are connected in series. In the figure, the B terminal is a phase-B output terminal, B is a phase-B input terminal, and N, n is a zero-phase node. K21, K22, K23, KC21 and KC22 are electronic compound switches or thyristors, when the intelligent control device is used, the intelligent control device automatically detects the voltage and reactive power change of the user side of the low-voltage bus, the output voltage is controlled by controlling the on-off of K21, K22 and K23, and the control logic is shown in a table 2.
Table 2B phase voltage regulation compensation module control logic table.
Figure 482107DEST_PATH_IMAGE002
As shown in fig. 3C, the circuit structure of the C-phase voltage-regulating compensation module includes a C-phase winding, the C-phase winding is connected in series with a switch K33 between an output end of the C-phase line and a zero line, the C-phase winding is composed of a C-phase series winding and a C-phase common winding which are connected in series in sequence, the C-phase common winding is composed of a C-phase common winding i section, a C-phase common winding ii section and a C-phase common winding iii section which are connected in series in sequence, an input end of the C-phase line is connected with a node between the C-phase series winding and the C-phase common winding i section, the node between the C-phase common winding i section and the C-phase common winding ii section is connected with the zero line through a switch K31, the node between the C-phase common winding ii section and the C-phase common winding iii section is connected with the zero line through a switch K32, a switch K33 is connected between the C-phase common winding iii section and the zero line, an output end of the C-phase line, the output end of the C-phase line is connected with a zero line through a capacitor C32 and a switch KC32 which are connected in series. In the figure, the terminal C is a phase C output terminal, the terminal C is a phase C input terminal, and N, n is a zero phase node. K31, K32, K33, KC31 and KC32 are electronic compound switches or thyristors, when the intelligent control device is used, the intelligent control device automatically detects the voltage and reactive power change of the user side of the low-voltage bus, the output voltage is controlled by controlling the on-off of K31, K32 and K33, and the control logic is shown in table 3.
Table 3C phase voltage regulation compensation module control logic table.
Figure 346157DEST_PATH_IMAGE003
All switches in fig. 3a, 3b and 3c are controlled by the same control device. The compensation capacity of the capacitors C11, C12, C21, C22, C31 and C32 is 6 kvar.
As can be seen from tables 1, 2 and 3, the three-phase voltage-boosting circuit disclosed by the invention is designed with 400V and 30kVA of three phases, the boosting amplitude is 10% at most (divided into three grades of 2.5%, 5% and 10%), the compensation capacity is 12kvar (divided into 2 groups, and each group is 6kvar), voltage and reactive phase-splitting regulation can be realized, and the three-phase voltage-boosting circuit is more suitable for places with unbalanced three-phase loads.
The working process of the device is as follows:
1. the reactive compensation control device starts to work after the device is electrified, determines the voltage and reactive real-time values of the voltage line through monitoring the voltage and reactive of a user side, compares the real-time values with a set standard value and synthesizes a voltage and reactive working area, if action is needed, an instruction is sent, voltage and reactive adjustment can be controlled in a phase-division mode, and the voltage and power factors are kept in a qualified range;
2. the reactive compensation can realize the functions of remote measurement, remote signaling, remote control and remote regulation according to the system requirements through a GPRS communication system.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (6)

1. A low-voltage line voltage reactive compensation control device is characterized by comprising a shell fixedly connected with a mounting bracket and a low-voltage line split-phase automatic voltage regulating device arranged in the shell; the automatic low-voltage line split-phase voltage regulating device comprises an A-phase voltage regulating and compensating module, a B-phase voltage regulating and compensating module and a C-phase voltage regulating and compensating module, wherein the A-phase voltage regulating and compensating module is installed between an A-phase line and a zero line; the shell is provided with a primary wire inlet hole and a secondary wire inlet hole;
the circuit structure of the B-phase voltage-regulating compensation module comprises a B-phase winding, wherein the B-phase winding is connected between the output end of a B-phase line and a zero line in series with a switch K23, the B-phase winding consists of a B-phase series winding and a B-phase common winding which are sequentially connected in series, the B-phase common winding consists of a B-phase common winding I section, a B-phase common winding II section and a B-phase common winding III section which are sequentially connected in series, the input end of the B-phase line is connected with a node between the B-phase series winding and the B-phase common winding I section, the node between the B-phase common winding I section and the B-phase common winding II section is connected with the zero line through a switch K21, the node between the B-phase common winding II section and the B-phase common winding III section is connected with the zero line through a switch K22, a switch K23 is connected between the B-phase common winding III section and the zero line, and the output end of the B-phase line is connected with a zero line through a capacitor C21, the output end of the phase B line is connected with a zero line through a capacitor C22 and a switch KC22 which are connected in series.
2. The reactive compensation control device for low-voltage line voltage according to claim 1, wherein the circuit structure of the A-phase voltage regulation compensation module comprises an A-phase winding, the A-phase winding is connected in series with a switch K13 between the output end of the A-phase line and the zero line, the A-phase winding is composed of an A-phase series winding and an A-phase common winding which are connected in series in sequence, the A-phase common winding is composed of an A-phase common winding I section, an A-phase common winding II section and an A-phase common winding III section which are connected in series in sequence, the input end of the A-phase line is connected with a node between the A-phase series winding and the A-phase common winding I section, the node between the A-phase common winding I section and the A-phase common winding II section is connected with the zero line through a switch K11, the node between the A-phase common winding II section and the A-phase common winding III section is connected with the zero line through a switch K12, and a switch K13 is connected between the A-phase common winding III section and the, the output end of the phase line A is connected with a zero line through a capacitor C11 and a switch KC11 which are connected in series, and the output end of the phase line A is connected with the zero line through a capacitor C12 and a switch KC12 which are connected in series.
3. The reactive compensation control device for low-voltage line voltage according to claim 1, wherein the circuit structure of the C-phase voltage regulation compensation module comprises a C-phase winding, the C-phase winding is connected in series with a switch K33 between the output end of the C-phase line and the zero line, the C-phase winding is composed of a C-phase series winding and a C-phase common winding which are connected in series in sequence, the C-phase common winding is composed of a C-phase common winding I section, a C-phase common winding II section and a C-phase common winding III section which are connected in series in sequence, the input end of the C-phase line is connected with a node between the C-phase series winding and the C-phase common winding I section, the node between the C-phase common winding I section and the C-phase common winding II section is connected with the zero line through a switch K31, the node between the C-phase common winding II section and the C-phase common winding III section is connected with the zero line through a switch K32, and the switch K33 is connected between the C-phase common winding III section and the, the output end of the C-phase line is connected with a zero line through a capacitor C31 and a switch KC31 which are connected in series, and the output end of the C-phase line is connected with the zero line through a capacitor C32 and a switch KC32 which are connected in series.
4. The low-voltage line voltage reactive compensation control device of claim 2, wherein the switches K11, K12, K13, KC11 and KC12 are compound switches or thyristor switches.
5. The low-voltage line voltage reactive compensation control device of claim 2, wherein the switches K21, K22, K23, KC21 and KC22 are compound switches or thyristor switches.
6. The low-voltage line voltage reactive compensation control device of claim 3, wherein the switches K31, K32, K33, KC31 and KC32 are compound switches or thyristor switches.
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