CN210041341U - Automatic three-phase load imbalance adjusting system for low-voltage distribution network - Google Patents
Automatic three-phase load imbalance adjusting system for low-voltage distribution network Download PDFInfo
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Abstract
The patent of the utility model belongs to the electric power system field specifically discloses an unbalanced automatic adjustment system of low voltage distribution network three-phase load, include: the system comprises a distribution transformer port power quality control device, an integrated controller, a terminal signal acquisition and controller, a branch power electronic power quality control device and a phase change switch body controller; the power quality management device for the distribution transformer port acquires a first voltage value and a first current value of the distribution transformer port of the low-voltage distribution network in real time, and the terminal signal acquisition and controller acquires a second voltage value and a second current value of each branch circuit of the circuit in real time; and the integrated controller analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value and automatically adjusts the power quality. Through the technical scheme, the system realizes unbalanced automatic adjustment on the line, reduces the line loss, improves the power supply capacity of the power distribution network, and effectively improves the convenience of electricity consumption of residents.
Description
Technical Field
The patent of the utility model relates to an electric power system technical field, especially a unbalanced automatic adjustment system of low-voltage distribution network three-phase load.
Background
In a low-voltage distribution network, the proportion of single-phase loads is large, the randomness of the use of the loads is high, and the three-phase load imbalance of the distribution network is often caused. Three-phase imbalance refers to the fact that the amplitudes of three-phase currents or voltages in a power system are inconsistent, and the amplitude difference exceeds a specified range. Long-term unbalanced three-phase operation of low-voltage distribution networks causes problems, such as reduced transformer output, increased transformer losses, faulty operation of the network protection components, increased line losses, and "low voltage" at the ends of the distribution network.
Aiming at the phenomenon of three-phase load imbalance commonly existing in the low-voltage distribution network, the method adopted at present is to perform statistical analysis on the load imbalance degree of a distribution area, and then manually perform load adjustment or add centralized compensation equipment at a distribution transformer port according to the analysis result. Before manual adjustment, the whole low-voltage platform area must be powered off, and then branch lines with large low-voltage line loads are adjusted. When the T-point is adjusted every time, a long time is needed from the work ticket to the work completion, so that the normal electricity utilization of the user is influenced, and the electricity fee income loss of the power supply enterprise is caused.
Moreover, the current automatic adjustment system only collects the voltage and current signals of the distribution and transformation port, does not monitor the load and voltage condition of the whole distribution network in an all-round manner, has an unsatisfactory adjustment effect, cannot realize the unbalanced management of a tail end line, and cannot radically solve the problem of unbalanced three-phase load of the distribution network.
Based on this, how to realize the automatic adjustment of the three-phase load imbalance of the power distribution network is a technical problem that needs to be solved by those skilled in the art at present.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model aims at providing a low-voltage distribution network unbalanced three-phase load automatic regulating system.
In order to achieve the above purpose, the technical scheme of the utility model is that:
an automatic three-phase load imbalance adjustment system for a low-voltage distribution network, comprising: the system comprises a distribution transformer port power quality control device, an integrated controller, a terminal signal acquisition and controller, a branch power electronic power quality control device and a phase change switch body controller;
the branch power electronic power quality control device and the phase change switch body controller are respectively connected with the terminal signal acquisition and controller;
the power distribution and transformation port power quality management device acquires a first voltage value and a first current value of a low-voltage distribution and transformation port in real time, and the terminal signal acquisition and controller acquires a second voltage value and a second current value of each branch of a distribution network line in real time;
and the integrated controller analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value and automatically adjusts the power quality.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, centralized controller still is used for:
obtaining three-phase load unbalance, harmonic waves and power factors of the distribution and transformation port and each branch circuit according to the first voltage value, the first current value, the second voltage value and the second current value;
and automatically adjusting the three-phase load unbalanced load of the low-voltage distribution network by using the phase change switch according to the three-phase load unbalanced degree, the harmonic wave and the power factor of the distribution transformer port, the main branch and each branch.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, join in marriage and become port electric energy quality and administer the device and can also be used for:
and after the step of automatically adjusting the three-phase load unbalance of the low-voltage distribution network by using the phase change switch, automatically adjusting the three-phase load unbalance, harmonic waves and power factors of the distribution and transformation port of the low-voltage distribution network.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, terminal signal acquisition and controller still are used for:
and automatically adjusting the three-phase load unbalance, the harmonic waves and the power factors of the branches of the distribution network line.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, branch's power electronic power quality administers the device and still is used for:
and automatically adjusting the three-phase load unbalance, the harmonic waves and the power factors of the branches of the distribution network line.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, through wireless, carrier wave or the arbitrary mode communication of RS485 between centralized control ware and the terminal signal acquisition and the controller.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, terminal signal acquisition and controller manage device and commutation switch this between the controller through wireless or arbitrary mode communication of carrier wave with branch power electronic power quality respectively.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, centralized control ware and join in marriage and become port electric energy quality and administer the device and pass through wireless or wired mode communication.
Further, the utility model discloses a low-voltage distribution network three-phase unbalanced load automatic adjustment system, the centralized control ware includes current acquisition module, voltage acquisition module, data processing module, IGBT drive module, communication module and man-machine interaction module;
the current acquisition module, the voltage acquisition module, the IGBT driving module, the communication module and the human-computer interaction module are respectively connected with the data processing module, the communication module is respectively connected with the distribution transformer port electric energy quality management device and the terminal signal acquisition and control device, and the IGBT driving module is connected with external primary equipment;
the current acquisition module and the voltage acquisition module respectively acquire a current signal and a voltage signal which are input from the outside and transmit the current signal and the voltage signal to the data processing module; and the IGBT driving module sends an IGBT driving signal to control the primary equipment.
Further, low-voltage distribution network unbalanced three-phase load automatic adjustment system, communication module includes wireless communication unit, carrier communication unit, RS485 communication unit and GPRS communication unit.
Compared with the prior art, the utility model provides a low-voltage distribution network three-phase load unbalance automatic adjustment system's structure is distinctive, through distribution transformer port electric energy quality treatment device obtain the first voltage value and the first current value of each distribution transformer port of low-voltage distribution network in real time, terminal signal gathers and the controller obtains the second voltage value and the second current value of each branch way of distribution network circuit in real time;
the integrated controller analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value, and automatically adjusts the power quality; in addition, the three-phase load unbalanced load, harmonic wave and power factor of the low-voltage distribution network distribution and transformation port and each branch of the distribution network line are automatically adjusted by the distribution and transformation port electric energy quality control device, the branch electric power electronic electric energy quality control device and the phase change switch body controller, so that the three-phase load unbalanced load, the harmonic wave and the power factor of the low-voltage distribution and transformation port and each branch of the distribution network line are quickly and automatically adjusted at the same time, the adjustment consistency is kept, and the misadjustment caused by the inconsistency of the distribution and transformation port and each branch of the distribution network line is avoided; through the comprehensive adjustment of unbalanced three-phase load, harmonic waves and power factors of the distribution transformer port and each branch of the distribution network line, the unbalance is really realized on the line, the line loss is reduced, the power supply capacity of the distribution network is improved, and the convenience of electricity utilization of residents is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to one embodiment of the present invention;
fig. 2 is a structural diagram of a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to one embodiment of the present invention;
fig. 3 is a flow chart of a method for adjusting a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to one embodiment of the present invention;
fig. 4 is a flowchart of a method for adjusting three-phase load imbalance of branches of a distribution network line by using the automatic three-phase load imbalance adjustment system of the low-voltage distribution network according to one embodiment of the present invention;
fig. 5 is a flowchart of a method for adjusting three-phase load imbalance of a distribution transformer port by using an automatic three-phase load imbalance adjustment system of a low-voltage distribution network according to an embodiment of the present invention;
fig. 6 is a block diagram of an integrated controller of the automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to one embodiment of the present invention;
fig. 7 is a block diagram of a communication module of an integrated controller of a three-phase load imbalance automatic adjustment system for a low-voltage distribution network according to an embodiment of the present invention;
fig. 8 is a schematic diagram of an integrated controller of the automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to one embodiment of the present invention;
fig. 9 is a schematic diagram of the phase change switch body controller of the low-voltage distribution network three-phase unbalanced load automatic adjustment system according to one embodiment of the present invention.
In the figure: 100-distribution transformer port electric energy quality treatment device, 200-integrated controller, 201-current acquisition module, 202-voltage acquisition module, 203-data processing module, 204-IGBT driving module, 205-communication module, 206-man-machine interaction module, 300-terminal signal acquisition and controller, 400-branch electric power electronic electric energy quality treatment device and 500-phase change switch body controller.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, fig. 1 is a structural diagram of a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to an embodiment of the present invention; in this embodiment, low-voltage distribution network unbalanced three-phase load automatic adjustment system, include: the system comprises a distribution transformer port power quality control device 100, an integrated controller 200, a terminal signal acquisition and control device 300, a branch power electronic power quality control device 400 and a phase change switch body controller 500;
the distribution transformer port power quality control device 100 and the terminal signal acquisition and controller 300 are respectively connected with the integrated controller 200, and the branch power electronic power quality control device 400 and the phase change switch body controller 500 are respectively connected with the terminal signal acquisition and controller 300;
the distribution transformer port power quality management device 100 acquires a first voltage value and a first current value of a distribution transformer port of a low-voltage distribution network in real time, and the terminal signal acquisition and controller 300 acquires a second voltage value and a second current value of each branch of a distribution network line in real time;
and the integrated controller 200 analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value, and performs automatic adjustment.
In one embodiment, the automatic three-phase load imbalance adjustment system for the low-voltage distribution network of the present invention, the centralized controller 200 can further be configured to:
obtaining three-phase load unbalance, harmonic waves and power factors of the distribution and transformation port and each branch circuit according to the first voltage value, the first current value, the second voltage value and the second current value;
and automatically adjusting the three-phase load unbalanced load of the low-voltage distribution network by using the phase change switch according to the three-phase load unbalanced degree, the harmonic wave and the power factor of the distribution transformer port, the main branch and each branch.
In one of the embodiments, the utility model discloses an unbalanced three-phase load automatic adjustment system of low voltage distribution network, distribution transformer port electric energy quality governance device 100 can also be used to:
and after the step of automatically adjusting the three-phase load unbalance of the low-voltage distribution network by using the phase change switch, automatically adjusting the three-phase load unbalance, harmonic waves and power factors of the distribution and transformation port of the low-voltage distribution network.
In one embodiment, the three-phase unbalanced load automatic adjustment system for the low-voltage distribution network described in the present invention, the terminal signal acquisition and controller 300 can also be used to:
and automatically adjusting the three-phase load unbalance, the harmonic waves and the power factors of the branch circuits of the low-voltage distribution network.
In one of them embodiment, low-voltage distribution network three-phase unbalanced load automatic adjustment system, branch power electronics electric energy quality improvement device 400 can also be used to:
and automatically adjusting the three-phase load unbalance, the harmonic waves and the power factors of the branch circuits of the low-voltage distribution network.
In one of them embodiment, low-voltage distribution network three-phase unbalanced load automatic adjustment system, through wireless, carrier wave or the arbitrary mode communication of RS485 between centralized control ware 200 and the terminal signal acquisition and the controller 300.
In one embodiment, the automatic three-phase load imbalance adjustment system for the low-voltage distribution network described in the present invention, the terminal signal acquisition and control unit 300 communicates with the branch power electronic power quality management unit 400 and the phase-change switch body controller 500 in any wireless or carrier communication mode.
In one embodiment, the automatic three-phase load imbalance adjustment system for the low-voltage distribution network described in the present invention, the centralized controller 200 communicates with the distribution transformer port power quality management device 100 in a wireless or wired manner.
The utility model discloses a low-voltage distribution network three-phase load unbalance automatic adjustment system, through join in marriage and become port power quality control device 100 device and acquire the first voltage value and the first current value of joining in marriage and become the port in low-voltage distribution network in real time, terminal signal gathers and controller 300 acquires the second voltage value and the second current value of each branch way of distribution network line in real time; the integrated controller 200 analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value, and performs automatic adjustment; in addition, the distribution transformer port electric energy quality treatment device 100, the branch power electronic electric energy quality treatment device 400 and the commutation switch body controller 500 are used for respectively and automatically adjusting the three-phase load unbalanced load, harmonic wave and power factor of the distribution transformer port of the low-voltage distribution network and each branch circuit, so that the distribution transformer port of the low-voltage distribution network and the three-phase load unbalanced load, harmonic wave and power factor of each branch circuit can be quickly and automatically adjusted at the same time, the adjustment consistency is kept, and the misadjustment caused by the fact that the distribution transformer port and each branch circuit of the distribution network circuit are not balanced is avoided; through the comprehensive adjustment of unbalanced three-phase load, harmonic waves and power factors of the distribution transformer port and each branch of the distribution network line, the unbalance is really realized on the line, the line loss is reduced, the power supply capacity of the distribution network is improved, and the convenience of electricity utilization of residents is effectively improved.
As shown in fig. 2, fig. 2 is a structural diagram of a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to an embodiment of the present invention, in this embodiment, a current transformer disposed at a distribution transformer port samples the distribution transformer port in a centralized manner, so as to obtain a first voltage value and a first current value of the distribution transformer port; the distribution transformer port power quality management device 100 acquires the first voltage value and the first current value in real time, and can transmit the first voltage value and the first current value to the centralized controller 200 in an RS485 manner; the centralized controller 200 analyzes the three-phase load unbalance load, the harmonic wave and the power factor of the distribution and transformation port according to the first voltage value and the first current value;
sampling each branch circuit through a current transformer arranged on each branch circuit, wherein the sampling is used for acquiring a second voltage value and a second current value of each branch circuit of the distribution network circuit, and the terminal signal acquisition and controller 300 acquires the second voltage value and the second current value in real time and transmits the second voltage value and the second current value to the centralized controller 200; the centralized controller 200 analyzes and obtains the three-phase load unbalance load, the harmonic wave and the power factor of each branch circuit according to the second voltage value and the second current value;
the centralized controller 200 preferentially performs preliminary adjustment on the three-phase load imbalance of each branch circuit through the phase change switch body controller 500 according to the three-phase load imbalance load, the harmonic wave and the power factor of the distribution transformer port, the main branch circuit and each branch circuit; secondly, the adjustment of residual unbalanced load, harmonic waves and power factors is finished by the power quality comprehensive device of the distribution transformer port; then, the branch power electronic power quality management device 400 further refines and adjusts the three-phase load unbalance load, the harmonic wave and the power factor of each branch; through the three-stage operation, the optimal control and adjustment of three-phase unbalanced load, harmonic waves and power factors are finally realized, and the condition that the adjustment requirements of each branch circuit and the distribution transformer port are inconsistent is avoided.
In practical application of the automatic adjustment system for three-phase load imbalance of the low-voltage distribution network, the centralized controller 200 analyzes the three-phase voltage and current load conditions of each acquisition point to perform adjustment control, and the whole system can acquire the voltage and current of the distribution and transformation port and the voltage and current of each branch, so that the comprehensive detection and analysis of the power quality of the whole distribution line are realized, and an optimal adjustment strategy is performed according to the analysis result.
As shown in fig. 3, fig. 3 is a flow chart of a method for adjusting a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to an embodiment of the present invention; in practical applications, the three-phase load unbalance of the low-voltage distribution network can be automatically adjusted in the following manner (in the embodiment, the three-phase load unbalance load is measured by the unbalance degree).
Each device communicates with the master controller in a carrier, wireless or wired mode, and the master controller performs adjustment control by analyzing the three-phase current load condition of each acquisition point and the compensation condition of each device.
1. Firstly, acquiring unbalance, harmonic waves and power factors of a distribution and transformation port and each branch of a distribution network line; then, judging whether the unbalance degree of the distribution transformer port is less than 15%, if so, performing the following process, otherwise, performing the process 2;
1.1, when the unbalance degree of the distribution transformer port is less than 15%, starting the branch distribution transformer port electric energy quality device 100 to compensate the unbalance degree;
1.2, when the unbalance degree of the distribution and transformation port is less than 15%, particularly, when the unbalance degree of the distribution and transformation port is less than 1% (where 1% is only a set value, and other values, such as 0.5%, may also be set according to actual requirements), judging whether the power factor of the distribution and transformation port is greater than 0.9, if so, judging that the capacity of the equipment compensation device is remained, and if so, starting the power quality device of the distribution and transformation port of the branch circuit to compensate the power factor;
1.3 when the power factor of the distribution and transformation port is greater than 0.9, judging whether the harmonic of the distribution and transformation port is greater than 5%, if so, judging whether the capacity of the branch circuit compensation device is remained, and if so, starting the distribution and transformation port power quality device 100 of the branch circuit to compensate the harmonic.
As shown in fig. 4, fig. 4 is a flowchart of a method for adjusting three-phase load imbalance of each branch of a distribution network line by using the automatic three-phase load imbalance adjustment system of the low-voltage distribution network according to one embodiment of the present invention.
2. When the unbalance degree of the distribution and transformation port is less than 15%, next, judging the three-phase load condition of each branch circuit;
2.1, judging whether the unbalance degree of the tail end branch is less than 15%, and if so, judging the power factor;
judging whether the power factor is larger than 0.9, if so, judging whether the capacity of the branch compensating device is remained, and if yes, compensating the power factor if branch power electronic compensating equipment of the branch is started;
2.2, judging whether the unbalance degree of the tail end branch is more than 15%, if so, firstly adjusting the tail end phase change switch to adjust the unbalance degree,
starting a branch power electronic compensation device to compensate the unbalance degree of the tail end branch according to the adjustment and increase result;
and judging whether the power factor is greater than 0.9, if so, judging whether the capacity of the branch circuit compensation device is remained, and if so, starting the branch power electronic compensation equipment of the branch circuit to compensate the power factor.
Fig. 5 is a flowchart of a method for adjusting three-phase load imbalance of a distribution transformer port by using an automatic three-phase load imbalance adjusting system of a low-voltage distribution network according to an embodiment of the present invention;
2.3 starting the first compensation device
2.3.1, judging whether the unbalance degree of the distribution and transformation port is less than 15%, and if the unbalance degree of the distribution and transformation port is less than 15%, starting the power quality device of the distribution and transformation port of the branch to compensate the unbalance degree;
2.3.2, when the unbalance degree of the distribution and transformation port is less than 15%, judging whether the power factor of the distribution and transformation port is greater than 0.9, if so, judging whether the capacity of the equipment compensation device is remained, and if so, starting the power quality device of the distribution and transformation port of the branch circuit to compensate the power factor;
2.3.3, when the power factor of the distribution and transformation port is larger than 0.9, judging whether the harmonic wave of the distribution and transformation port is larger than 5%, if so, judging whether the capacity of the branch circuit compensation device is remained, and if so, starting the power quality device of the distribution and transformation port of the branch circuit to compensate the harmonic wave.
By using the method, the three-phase load of each branch circuit, the main line and the distribution and transformation port is completely balanced by hierarchically adjusting each branch circuit compensation device and each centralized compensation device. Through the technical means, the utility model discloses a low-voltage distribution network unbalanced three-phase load automatic adjustment system has realized the full automatization adjustment to the unbalanced three-phase load of distribution network, has reduced workman's intensity of labour; when the maintenance is needed, the switching is fast, the power is not cut off, and the reliability of power supply of residents is improved; the consistency of regulation is kept by comprehensively analyzing each branch circuit, the main line and the distribution and transformation port; misadjustment caused by inconsistency of branch and total imbalance is avoided; the unbalance on the line is really realized, the line loss is reduced, and the power supply capacity of a distribution network is improved; the capacity of the head-end power electronic equipment is reduced, and the cost performance of the complete equipment is high; three-phase simultaneous compensation of unbalance and power factors at the tail end of a circuit is realized through a branch power electronic compensation mode; the unbalance degree, harmonic wave and power factor of three-phase load can be comprehensively controlled.
As shown in fig. 6, fig. 6 is a block diagram of an integrated controller of a three-phase load imbalance automatic adjustment system for a low-voltage distribution network according to an embodiment of the present invention; in this embodiment, the utility model discloses a three-phase load unbalance automatic adjustment system of low-voltage distribution network, the centralized controller 200 includes current collection module 201, voltage collection module 202, data processing module 203, IGBT drive module 204, communication module 205 and human-computer interaction module 206;
the current acquisition module 201, the voltage acquisition module 202, the IGBT driving module 204, the communication module 205 and the human-computer interaction module 206 are respectively connected with the data processing module 203, the communication module 203 is respectively connected with the distribution transformer port electric energy quality control device 100 and the terminal signal acquisition and control device 300, and the IGBT driving module 204 is connected with external primary equipment;
the current acquisition module 201 and the voltage acquisition module 202 respectively acquire an externally input current signal and an externally input voltage signal and transmit the current signal and the voltage signal to the data processing module 203; the IGBT driving module 204 sends an IGBT driving signal to control the primary device to automatically adjust the three-phase unbalanced load, the harmonic, and the power factor.
As shown in fig. 7, fig. 7 is a block diagram of a communication module of an integrated controller of a three-phase load imbalance automatic adjustment system for a low-voltage distribution network according to an embodiment of the present invention; in this embodiment, unbalanced three-phase load automatic adjustment system of low-voltage distribution network, communication module 205 includes wireless communication unit 2051, carrier communication unit 2052, RS485 communication unit 2053 and GPRS communication unit 2054.
As shown in fig. 8, fig. 8 is a schematic diagram of an integrated controller of a three-phase load imbalance automatic adjustment system for a low-voltage distribution network according to an embodiment of the present invention; in this embodiment, the current collecting module 201 is configured to collect current information of a branch sampling current transformer and a branch sampling current transformer; the centralized controller 200 is connected with a centralized power quality management device, a main branch sampling current transformer and a distributed power quality management device through a communication module 205; the integrated controller can also be connected with primary equipment and used for sending an IGBT driving signal and controlling a control unit of the primary equipment, wherein the control unit is an IGBT module, the IGBT module is arranged in a control circuit, and the control circuit is a midpoint clamping type three-level inverter circuit; the neutral point clamping type three-level inverter circuit comprises the following components:
1) the direct-current filter capacitor is formed by connecting Cd1 and Cd2 in series, and Cd1 is Cd2, so O is the midpoint of the direct-current power supply;
2) each bridge arm consists of two bidirectional power switches (asymmetric), taking an A-phase upper bridge arm as an example, VG1m and VD1m are main power switches, VT1a and VD1a are auxiliary power switches, wherein VT1m and VT1a are full-control devices; and the rest bridge arms are analogized.
3) And a clamping diode VD1-VD6 is connected between the midpoint of each bridge arm and the power supply midpoint.
The neutral point clamped three-level inverter circuit comprises an A, B, C three-phase circuit, wherein A, B, C three phases are respectively connected with one ends of fuses RUa, RUb and RUc, the other ends of the fuses FUa, FUb and FUc are respectively connected with an inductance component L1, the other end of the inductance component L1 is connected with a normally open contact KM1 of a contactor and a capacitance group C1, the other end of the normally open contact KM1 of the contactor is connected with an inductance component L2, the other end of the inductance component L2 is connected with the inverter circuit, the other end of the capacitance group C1 is connected with an inductance component L3, and the other end of the inductance component L3 is connected with an N pole.
As shown in fig. 9, fig. 9 is a schematic diagram of a phase change switch body controller of a three-phase load imbalance automatic adjustment system of a low-voltage distribution network according to an embodiment of the present invention; in this embodiment, the commutation switch is composed of single-phase permanent-magnet switches QF1, QF2, QF3, a current transformer TA1, and a commutation switch body controller, where the commutation switch body controller includes a voltage acquisition module, a current acquisition module, a control module, a man-machine exchange module, a communication module, and the like, the control module controls the voltage acquisition module to acquire input voltages UA, UB, UC, and output voltage UL in real time, controls the current acquisition module to acquire output current IL in real time, and completes commutation operation according to a superior control system instruction and a man-machine interaction instruction; for example, at present, QF1 is in the on position, QF2 and QF3 are in the off position, and the phase is switched to the B phase after the instruction of the upper-level control system; when a load exists, the controller detects the zero crossing point of the output current and the zero crossing point of the voltage B phase voltage, the QF1 switch is cut off when the output current crosses zero, and the QF2 is put into when the voltage B phase crosses zero, so that the phase change operation is completed; when no load exists, the controller detects the zero crossing point of the output voltage and the zero crossing point of the voltage B phase voltage, the QF1 switch is cut off when the output voltage crosses zero, and the QF2 is input when the voltage B phase crosses zero, so that the phase change operation is completed.
The utility model discloses a low-voltage distribution network three-phase load unbalance automatic adjustment system, through join in marriage and become port electric energy quality control device 100 and acquire the first voltage value and the first current value of each join in marriage of low-voltage distribution network and become the port in real time, terminal signal gathers and controller 300 acquires the second voltage value and the second current value of each branch way of joining in marriage and become the port in real time; the integrated controller 200 analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value, and performs automatic adjustment; in addition, the distribution transformer port electric energy quality control device 100, the branch electric power electronic electric energy quality control device 400 and the commutation switch body controller 500 are used for respectively and automatically adjusting the three-phase load unbalanced load, harmonic wave and power factor of the distribution transformer port of the low-voltage distribution network and each branch circuit, so that the distribution transformer port of the low-voltage distribution network and the three-phase load unbalanced load, harmonic wave and power factor of each branch circuit can be quickly and automatically adjusted at the same time, the adjustment consistency is kept, and the misadjustment caused by the fact that the distribution transformer port and each branch circuit are not balanced is avoided; through the comprehensive adjustment of unbalanced three-phase load, harmonic waves and power factors of the distribution and transformation port and each branch circuit, the unbalance is really realized on the circuit, the circuit loss is reduced, the power supply capacity of the power distribution network is improved, and the convenience of the electricity consumption of residents is effectively improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a low voltage distribution network three-phase unbalanced load automatic regulating system which characterized in that includes: the system comprises a distribution transformer port power quality control device, an integrated controller, a terminal signal acquisition and controller, a branch power electronic power quality control device and a phase change switch body controller;
the branch power electronic power quality control device and the phase change switch body controller are respectively connected with the terminal signal acquisition and controller;
the power distribution and transformation port power quality management device acquires a first voltage value and a first current value of a low-voltage distribution and transformation port in real time, and the terminal signal acquisition and controller acquires a second voltage value and a second current value of each branch of a distribution network line in real time;
and the integrated controller analyzes the power quality of the whole low-voltage distribution line according to the first voltage value, the first current value, the second voltage value and the second current value and automatically adjusts the power quality.
2. The system according to claim 1, wherein the centralized controller is further configured to:
obtaining three-phase load unbalance, harmonic waves and power factors of the distribution transformer port and each branch circuit of the distribution network line according to the first voltage value, the first current value, the second voltage value and the second current value;
and automatically adjusting the three-phase load unbalanced load of the low-voltage distribution network by using the phase change switch according to the three-phase load unbalanced degree, the harmonic wave and the power factor of the distribution transformer port, the main branch and each branch.
3. The automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to claim 2, wherein the distribution transformer port power quality management device is further configured to:
and after the step of automatically adjusting the three-phase load unbalance of the low-voltage distribution network by using the phase change switch, automatically adjusting the three-phase load unbalance, harmonic waves and power factors of the distribution and transformation port of the low-voltage distribution network.
4. The system according to claim 1, wherein the terminal signal acquisition and control unit is further configured to:
and automatically adjusting the three-phase load unbalance, the harmonic waves and the power factors of the branches of the distribution network line.
5. The automatic three-phase load imbalance adjustment system for a low-voltage distribution network according to claim 1, wherein the branch power electronic power quality management device is further configured to:
and automatically adjusting the three-phase load unbalance, the harmonic waves and the power factors of the branches of the distribution network line.
6. The automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to claim 1, characterized in that:
the centralized controller is communicated with the terminal signal acquisition and control device in any one of a wireless mode, a carrier wave mode or an RS485 mode.
7. The automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to claim 1, characterized in that:
the terminal signal acquisition and control device is communicated with the branch power electronic power quality control device and the phase change switch body controller in a wireless or carrier mode.
8. The automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to claim 1, wherein the centralized controller communicates with the distribution transformer port power quality management device in a wireless or wired manner.
9. The automatic three-phase load imbalance adjustment system for the low-voltage distribution network according to claim 1, characterized in that:
the integrated controller comprises a current acquisition module, a voltage acquisition module, a data processing module, an IGBT driving module, a communication module and a human-computer interaction module;
the current acquisition module, the voltage acquisition module, the IGBT driving module, the communication module and the human-computer interaction module are respectively connected with the data processing module, the communication module is respectively connected with the distribution transformer port electric energy quality management device and the terminal signal acquisition and control device, and the IGBT driving module is connected with external primary equipment;
the current acquisition module and the voltage acquisition module respectively acquire a current signal and a voltage signal which are input from the outside and transmit the current signal and the voltage signal to the data processing module; and the IGBT driving module sends an IGBT driving signal to control the primary equipment.
10. The automatic three-phase load imbalance adjustment system for a low-voltage distribution network according to claim 9, characterized in that: the communication module comprises a wireless communication unit, a carrier communication unit, an RS485 communication unit and a GPRS communication unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018788A (en) * | 2020-08-28 | 2020-12-01 | 广东电网有限责任公司广州供电局 | Three-phase unbalanced automatic commutation system |
| CN113346612A (en) * | 2021-04-30 | 2021-09-03 | 贵州电网有限责任公司 | Low-voltage distribution room three-phase load unbalance simulation adjustment method and system based on broadband power line carrier communication technology |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018788A (en) * | 2020-08-28 | 2020-12-01 | 广东电网有限责任公司广州供电局 | Three-phase unbalanced automatic commutation system |
| CN113346612A (en) * | 2021-04-30 | 2021-09-03 | 贵州电网有限责任公司 | Low-voltage distribution room three-phase load unbalance simulation adjustment method and system based on broadband power line carrier communication technology |
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