CN210327043U - Unbalanced three-phase automatic phase modulation system of low-voltage distribution network - Google Patents
Unbalanced three-phase automatic phase modulation system of low-voltage distribution network Download PDFInfo
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- CN210327043U CN210327043U CN201921251534.6U CN201921251534U CN210327043U CN 210327043 U CN210327043 U CN 210327043U CN 201921251534 U CN201921251534 U CN 201921251534U CN 210327043 U CN210327043 U CN 210327043U
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- 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
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Abstract
The utility model relates to a three-phase unbalanced automatic phase modulation system of a low-voltage distribution network, which comprises a main controller and a phase modulator; the input end of the main controller is connected with the distribution room master table, and the output end of the main controller is connected with the phase modulator; the phase modulator is connected with a line to be phase modulated; a phase modulator for performing phase modulation; and the main controller realizes the control of the phase-change device according to the change conditions of the current and voltage data of the table area general table. The utility model discloses other users need not have a power failure in the phase modulation process, do not influence other users' normal power consumption, are just accomplished the phase modulation under the condition of hardly cutting off the power supply by the phase modulation user, and phase modulation in-process voltage fluctuation is less. The system judges the three-phase unbalance degree automatically, in time carries out the phase modulation, guarantees that the voltage of user department is normal, and the phase modulation is efficient. Operation and maintenance personnel do not need to go to the site to perform phase modulation, and the labor burden is greatly reduced.
Description
Technical Field
The utility model relates to a power supply and distribution field, more specifically relates to an unbalanced three-phase automatic phase modulation system of low voltage distribution network.
Background
At present, the phenomenon of three-phase imbalance of a rural power distribution network is very common, and is one of main reasons for causing voltage instability, and three main reasons for causing three-phase imbalance are as follows: 1. the holiday property is that the annual large holiday is the peak day when the office workers return to the country, the load is obviously increased sharply, and the loss of the line is increased; 2. the peak time period of electricity consumption of rural residents is from 4 pm to 9 pm, the electricity consumption is large in the time period, and the load of power distribution equipment is increased rapidly; 3. the characteristics of regionality and large rural occupied area and low population density enable villagers to frequently have the condition of uneven distribution at residential sites. When the three-phase unbalance degree of the line is large, the voltage at the position of the one-phase user with a large load is low, otherwise, the voltage at the position of the one-phase user with a light load is high, and the three-phase unbalance influences the power utilization quality of serious users. The traditional phase modulation method can not carry load phase modulation, firstly, operation and maintenance personnel disconnect a main switch of a transformer area, and secondly, disconnect switches of all users on a live wire needing phase modulation. The two methods have large workload and influence on a large number of users, and have great influence on normal power utilization of users in rural power grid areas needing frequent phase modulation.
At present, the method for reducing phase modulation steps and accelerating phase modulation speed is mainly used through a plug-in phase modulation device. However, the method still cannot solve the problem of power failure of the user in the phase modulation process, and the normal power utilization of the user is still influenced.
The traditional phase modulation method needs to disconnect a main switch of a transformer area, and a user needs to be powered off, so that the normal power utilization of the user is influenced; operation and maintenance personnel need to carry out phase modulation on site, the phase modulation is not timely, and the working efficiency is low; for rural power distribution networks requiring frequent phase modulation, operation and maintenance personnel need to perform phase modulation back and forth, and work burden is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome above-mentioned prior art the defect that the phase modulation needs the outage provides an automatic phase modulation system of low voltage distribution network unbalanced three phase.
The system comprises a main controller and a phase modulator;
the input end of the main controller is connected with the distribution room master table, and the output end of the main controller is connected with the phase modulator; the phase modulator is connected with a line to be phase modulated; a phase modulator for performing phase modulation;
and the main controller realizes the control of the phase-change device according to the change conditions of the current and voltage data of the table area general table.
Preferably, the phase modulator comprises a phase modulation controller and three alternating current contactors;
the input end of the phase modulator is connected with the output end of the main controller; the output end of the phase-adjusting controller is connected with the control end of the alternating current contactor; the AC contactor is controlled to be switched on and off by a signal of the phase-adjusting controller;
the power supply sides of the three alternating-current contactors are respectively connected to A, B, C phase lines of three-phase four-wires of the transformer area, and the load sides are merged and connected to live wires of single-phase power supply lines.
Preferably, the phase modulator is provided with a three-phase power input interface and a single-phase power output interface.
Preferably, the main controller comprises a GPRS module, a processor and a power carrier module;
the power carrier module is used for realizing data transmission between the processor and the distribution room general table; the processor judges whether the phase modulation line needs phase conversion according to the voltage and current data of the transformer area general table and sends the processed data to the phase modulation controller; the GPRS module is connected with the processor and used for realizing clock synchronization with the distribution area general table.
Preferably, the system comprises a plurality of phase-modulating controllers.
Preferably, the main controller reads real-time three-phase current and voltage data of the station area general table through a power carrier communication channel by using a DLT645-2007 communication protocol.
Compared with the prior art, the utility model discloses technical scheme's beneficial effect is:
1. other users do not need to be powered off in the phase modulation process, the normal power utilization of other users is not influenced, the phase modulation is finished by the phase modulation users under the condition of almost no power off, and the voltage fluctuation in the phase modulation process is small.
2. The system judges the three-phase unbalance degree automatically, in time carries out the phase modulation, guarantees that the voltage of user department is normal, and the phase modulation is efficient.
3. Operation and maintenance personnel do not need to go to the site to perform phase modulation, and the labor burden is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a three-phase unbalanced automatic phase modulation system of a low-voltage distribution network.
In the figure, A, B, C are A, B, C phase lines, L is live line, and N is neutral line.
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 technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
The embodiment provides an automatic phase modulation system for three-phase imbalance of a low-voltage distribution network, as shown in fig. 1, the system comprises a main controller and a phase modulator;
the input end of the main controller is connected with the distribution room master table, and the output end of the main controller is connected with the phase modulator; the phase modulator is connected with a line to be phase modulated; a phase modulator for performing phase modulation;
and the main controller realizes the control of the phase-change device according to the change conditions of the current and voltage data of the table area general table.
The phase modulator comprises a phase modulation controller and three alternating current contactors;
the input end of the phase modulator is connected with the output end of the main controller; the output end of the phase-adjusting controller is connected with the control end of the alternating current contactor; the AC contactor is controlled to be switched on and off by a signal of the phase-adjusting controller;
the power supply sides of the three alternating-current contactors are respectively connected to A, B, C phase lines of three-phase four-wires of the transformer area, and the load sides are merged and connected to live wires of single-phase power supply lines.
The phase modulator is provided with a three-phase power supply input interface and a single-phase power supply output interface.
The main controller comprises a GPRS module, a processor and a power carrier module;
the power carrier module is used for realizing data transmission between the processor and the distribution room general table; the processor judges whether a phase modulation line needs phase conversion or not according to the voltage and current data of the distribution room general table (if the data is judged to exceed a set threshold value or not, the phase conversion is executed if the data exceeds a set range), and sends phase conversion information to the phase modulation controller; the GPRS module is connected with the processor and used for realizing clock synchronization with the distribution area general table.
The system comprises a plurality of phase-modulating controllers.
The main controller reads real-time three-phase current and voltage data of the station area general table through a power carrier communication channel by using a DLT645-2007 communication protocol.
The system of the embodiment comprises a main controller arranged in a power distribution room and a plurality of phase modulators, wherein each phase modulator is provided with a three-phase power supply input interface and a single-phase power supply output interface; the core component of the phase modulator is three alternating current contactors, and the alternating current contactors are controlled to be switched on and off by signals of a phase modulation controller; the main controller mainly comprises a processor, a GPRS module, a power carrier module and other communication modules. The main controller of the system is arranged in a distribution room of a transformer area; under the automatic phase modulation mode, the main controller reads real-time three-phase current and voltage data of a station area general table through a power line carrier communication channel by using a DLT645-2007 communication protocol. A processor in the main controller analyzes three-phase current and voltage data by operating an algorithm, and executes a phase modulator scheduling algorithm when judging that three-phase voltage is seriously influenced when the three-phase unbalance degree is large, namely phase modulation signals are sent to phase modulators at all T-junctions through a power carrier communication channel to implement phase modulation. In the remote phase modulation mode, operation and maintenance personnel send phase modulation instructions to the main controller through terminal equipment, and the main controller schedules a phase modulator at a T joint through a power carrier. When the phase modulation controller receives the phase modulation signal, the originally connected phase AC contactor is switched off, and then the corresponding AC contactor to be connected is switched on, and the phase modulation process in the whole process can be completed within 1 second.
Its advantage is: 1. other users do not need to be powered off in the phase modulation process, the normal power utilization of other users is not influenced, the phase modulation is finished by the phase modulation users under the condition of almost no power off, and the voltage fluctuation in the phase modulation process is small. 2. The system automatically judges the unbalance degree of the three phases, phase modulation is carried out in time, the voltage at the user is guaranteed to be normal, and the phase modulation efficiency is high. 3. Operation and maintenance personnel do not need to go to the site to perform phase modulation, and the labor burden is greatly reduced.
The terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to 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 (6)
1. The automatic phase modulation system for the three-phase unbalance of the low-voltage distribution network is characterized by comprising a main controller and a phase modulator;
the input end of the main controller is connected with the distribution room master table, and the output end of the main controller is connected with the phase modulator; the phase modulator is connected with a line to be phase modulated; a phase modulator for performing phase modulation;
and the main controller realizes the control of the phase-change device according to the change conditions of the current and voltage data of the table area general table.
2. The system according to claim 1, characterized in that said phase modulator comprises a phase modulation controller and three ac contactors;
the input end of the phase modulator is connected with the output end of the main controller; the output end of the phase-adjusting controller is connected with the control end of the alternating current contactor; the AC contactor is controlled to be switched on and off by a signal of the phase-adjusting controller;
the power supply sides of the three alternating-current contactors are respectively connected to A, B, C phase lines of three-phase four-wires of the transformer area, and the load sides are merged and connected to live wires of single-phase power supply lines.
3. The system according to claim 2, characterized in that the phase modulator is provided with a three-phase power input interface and a single-phase power output interface.
4. The automatic phase modulation system of the three-phase imbalance of the low-voltage distribution network of claim 3, wherein the main controller comprises a GPRS module, a processor and a power carrier module;
the power carrier module is used for realizing data transmission between the processor and the distribution room general table; the processor judges whether a phase modulation line needs phase conversion according to voltage and current data of the transformer area general table and sends phase conversion information to the phase modulation controller; the GPRS module is connected with the processor and used for realizing clock synchronization with the distribution area general table.
5. The system for automatically phasing three phases of an unbalanced low voltage distribution network of claim 4 wherein the system comprises a plurality of phase modulation controllers.
6. The automatic phase modulation system of the three-phase imbalance of the low-voltage distribution network of claim 5, wherein the main controller reads real-time three-phase current and voltage data of the station area general table through a power carrier communication channel by using a DLT645-2007 communication protocol.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243917A (en) * | 2021-12-15 | 2022-03-25 | 广东电网有限责任公司江门供电局 | Method and system for acquiring real-time data of power distribution network nodes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243917A (en) * | 2021-12-15 | 2022-03-25 | 广东电网有限责任公司江门供电局 | Method and system for acquiring real-time data of power distribution network nodes |
| CN114243917B (en) * | 2021-12-15 | 2023-08-04 | 广东电网有限责任公司江门供电局 | Method and system for acquiring real-time data of nodes of power distribution network |
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