CN212304759U - Device for modulating the electrical energy parameters at the end of a low-voltage line for a power distribution area - Google Patents
Device for modulating the electrical energy parameters at the end of a low-voltage line for a power distribution area Download PDFInfo
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- CN212304759U CN212304759U CN202020736418.XU CN202020736418U CN212304759U CN 212304759 U CN212304759 U CN 212304759U CN 202020736418 U CN202020736418 U CN 202020736418U CN 212304759 U CN212304759 U CN 212304759U
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Abstract
The utility model discloses a modulation device for distributing terminal electric energy parameter of low pressure circuit in platform district, include: the method comprises the following steps: the circuit breaker comprises a maintenance circuit breaker connected in series on a low-voltage line and modulation circuits connected in parallel on two sides of the maintenance circuit breaker; the modulation circuit comprises a PWM rectifier, an inverter and an output breaker which are sequentially connected in series, a direct current capacitor is connected between the output end of the PWM rectifier and the input end of the inverter, and the PWM rectifier are both composed of a mosfit/IGBT power electronic integrated circuit; the modulation device further comprises a central control unit connected to the PWM rectifier and the inverter, respectively. The utility model provides a modulation device one can rise to the standard value with the voltage of the low pressure circuit under the low pressure state, and the high-quality power consumption of nonlinear pollution guarantee resident such as harmonic in the elimination circuit is two.
Description
Technical Field
The utility model relates to a distribution network low pressure electric energy quality administers the field, especially relates to a modulation device that is used for distributing the terminal electric energy parameter of low voltage line in transformer substation.
Background
With the rapid development of national economy and the continuous improvement of living standard of people, high-power household appliances gradually enter urban and rural families, and a large amount of out-service workers return to the countryside during the spring festival, and the load of a rural power grid is increased rapidly at that time. However, in the process of building and transforming the rural power grid, due to the fact that load increase is predicted to be low, the problem that the voltage of the tail end of a user is too low in the peak period of power utilization and the like can occur, and the phenomenon of 'small tractor cart' is formed. Therefore, the contradiction between the rapidly-increased power utilization requirement and the slowly-increased power supply capacity and the relatively lagged equipment level is increasingly prominent, and the safe work of the power distribution system and the power utilization reliability of the tail end of a user are seriously influenced.
The conventional solutions at present mainly have the following aspects: firstly, through mode such as autotransformer lifting transformer substation bus voltage, increase distribution transformer gear directly heighten distribution transformer exit voltage value, this kind of mode can heighten distribution transformer exit voltage, but, nevertheless, can not be accurate adjust to the required operating voltage of user with exit voltage, and to the distribution station district near-end user influence very big, harm near-end user's consumer easily. And secondly, medium and low voltage line transformation is carried out to enlarge the line diameter or newly establish an outlet line, and the medium and low voltage line transformation method has the advantages of large investment, long construction period and poor economy.
Therefore, how to realize economic, efficient and accurate management of the quality of the power at the tail end of the power distribution area becomes a problem of current key and difficult research.
SUMMERY OF THE UTILITY MODEL
The utility model provides a modulation device for distributing the terminal electric energy parameter of low pressure circuit in platform district solves at present not good, the poor shortcoming of economic nature of low pressure user side electric energy quality treatment effect.
In order to solve the technical problem, the utility model provides a technical scheme does:
a device for modulating the electrical energy parameters of the low-voltage line ends of a distribution substation, comprising: the maintenance circuit breaker is connected in series on the low-voltage line, and the modulation circuits are connected in parallel on two sides of the maintenance circuit breaker; the modulation circuit comprises a PWM rectifier, an inverter and an output breaker which are sequentially connected in series, a direct-current capacitor is connected between the output end of the PWM rectifier and the input end of the inverter, and the PWM rectifier are both composed of a mosfit/IGBT power electronic integrated circuit;
the modulation device also comprises a central control unit which is respectively connected with the PWM rectifier and the inverter, and the central control unit is used for disconnecting the maintenance circuit breaker and closing the output circuit breaker when the low-voltage line is in a low-voltage state, so that the PWM rectifier, the direct-current capacitor and the inverter are connected to the low-voltage line, and the modulation device enters a boosting working mode; the central control unit is also used for closing an overhaul circuit breaker and disconnecting an output circuit breaker when the low-voltage line has reactive power loss, so that the PWM rectifier and the direct-current capacitor are connected into the low-voltage line, and the modulation device enters a reactive power compensation mode.
Preferably, the modulator further comprises an operation interface, the operation interface is connected with the central control unit, a boost button is arranged on the operation interface, and the central control unit is used for controlling the modulator to enter a boost working mode when a user selects the boost button on the operation interface.
Preferably, the operation interface is further provided with a reactive compensation button, and the central control unit is used for controlling the modulation device to enter a reactive compensation mode when a user selects the reactive compensation button on the operation interface.
Preferably, the modulation circuit further comprises an input breaker, the input breaker is connected in series between the low-voltage line and the input end of the PWM rectifier, a first fault button is further arranged on the operation interface, and the central control unit is used for disconnecting the input breaker, the output breaker and the overhaul breaker when the user selects the first fault button on the operation interface.
Preferably, the operation interface is further provided with a second fault button, and the central control unit is used for disconnecting the input breaker and the output breaker and closing the overhaul breaker when a user selects the second fault button on the operation interface.
Preferably, the monitoring device further comprises a monitoring component connected with the central control unit, wherein the monitoring component is used for acquiring the current parameters and the voltage parameters of the low-voltage line in real time and sending the current parameters and the voltage parameters to the central control unit.
Preferably, the modulation device further comprises a self-checking module connected with the central control unit, wherein the self-checking module is used for monitoring whether the modulation device has a fault in real time, and if the modulation device has the fault, the self-checking module sends a fault identification code to the central control unit.
Preferably, the low-voltage line monitoring system further comprises a display interface connected with the central control unit, wherein the display interface is used for displaying the current parameter and the voltage parameter so that a user can judge whether the low-voltage line is in a low-voltage state or a reactive loss state according to the current parameter and the voltage parameter.
Preferably, the display interface is further configured to display a fault identification code, so that a user can determine whether the modulation device has a fault according to the fault identification code.
The utility model discloses following beneficial effect has:
1. the utility model provides a modulation device for distributing station's terminal electric energy parameter of low voltage line for break off when low voltage line low pressure and overhaul the circuit breaker, closed output circuit breaker makes PWM rectifier, direct current condenser, dc-to-ac converter insert the low voltage line, makes modulation device enter the mode of step-up work, steps up to the low voltage line; the PWM rectifier and the DC capacitor are connected with the low-voltage line, the modulation device enters a reactive compensation mode, reactive compensation is carried out on the low-voltage line, and therefore the electric energy quality of a low-voltage user side is improved.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic diagram of a modulation device for modulating the electric energy parameters at the end of a low-voltage line in a distribution substation (solid line indicates strong electric connection, and dotted line indicates weak electric connection);
fig. 2 is a schematic diagram of a modulation device for the power parameters of the low-voltage line end of the distribution area according to the preferred embodiment of the present invention;
fig. 3 is a topological diagram of a device for modulating power parameters at the end of a low voltage line in a distribution substation according to a preferred embodiment of the present invention.
Wherein, control switch Q1 refers to the input breaker, control switch Q2 refers to the service breaker, control switch Q3 refers to the output breaker, drive plate 1 refers to the first drive plate, drive plate 2 refers to the second drive plate.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment discloses a modulation device for power parameters of an end of a low-voltage line of a power distribution area, comprising: the circuit breaker comprises a maintenance circuit breaker connected in series on a low-voltage line and modulation circuits connected in parallel on two sides of the maintenance circuit breaker; the modulation circuit comprises a PWM rectifier, an inverter and an output breaker which are sequentially connected in series, a direct current capacitor is connected between the output end of the PWM rectifier and the input end of the inverter, and the PWM rectifier are both composed of a mosfit/IGBT power electronic integrated circuit;
the modulation device also comprises a central control unit which is respectively connected with the PWM rectifier and the inverter, and the central control unit is used for disconnecting the maintenance circuit breaker and closing the output circuit breaker when the low-voltage line is in a low-voltage state, so that the PWM rectifier, the direct-current capacitor and the inverter are connected to the low-voltage line, and the modulation device enters a boosting working mode; the central control unit is also used for closing the maintenance circuit breaker and disconnecting the output circuit breaker when the low-voltage line has reactive power loss, so that the PWM rectifier and the direct current capacitor are connected into the low-voltage line, and the modulation device enters a reactive power compensation mode.
The utility model provides a modulation device for distributing station's terminal electric energy parameter of low voltage line for break off when low voltage line low pressure and overhaul the circuit breaker, closed output circuit breaker makes PWM rectifier, direct current condenser, dc-to-ac converter insert the low voltage line, makes modulation device enter the mode of step-up work, steps up to the low voltage line; the PWM rectifier and the DC capacitor are connected with the low-voltage line, the modulation device enters a reactive compensation mode, reactive compensation is carried out on the low-voltage line, and therefore the electric energy quality of a low-voltage user side is improved.
Example two:
the second embodiment is the preferred embodiment of the first embodiment, and the difference between the second embodiment and the first embodiment is that the structure and the function of the modulation device for the electric energy parameters at the end of the low-voltage line of the power distribution station area are expanded:
as shown in fig. 2, the utility model discloses a modulation device for terminal electric energy parameter of low voltage line in distribution station district includes: the monitoring system comprises a central control unit, a remote monitoring module, a lightning arrester, a bypass contactor, a monitoring assembly, a maintenance circuit breaker connected in series on a low-voltage line and modulation circuits connected in parallel on two sides of the maintenance circuit breaker; the remote monitoring module is provided with an operation interface and a display module, the modulation circuit comprises an input circuit breaker, an input filter, a PWM rectifier, an inverter, an output filter and an output circuit breaker which are sequentially connected in series, a direct current capacitor is connected between the output end of the PWM rectifier and the input end of the inverter, and the maintenance circuit breaker is connected in series in a low-voltage circuit.
The central control unit is connected with the input breaker, the output breaker and the overhaul breaker through bypass triggers respectively, and is also connected with the PWM rectifier, the inverter, the operation interface and the display interface.
The monitoring assembly comprises an input voltage and current acquisition module and an output voltage and current acquisition module, and the input voltage and current acquisition module and the output voltage and current acquisition module are connected with the central control unit.
The bypass trigger is used for reliably supplying power to a load under the condition of device failure, the lightning arrester mainly realizes transient input overvoltage protection of the device, the input breaker, the output breaker and the overhaul breaker mainly realize device exit and user power supply under the condition of device failure, the bypass contactor mainly realizes reliable power supply to the load under the condition of device failure, and the central control unit realizes control over the PWM rectifier, the inverter and the bypass contactor in the device by acquiring voltage and current parameters uploaded by the input voltage and current acquisition module and the output voltage and current acquisition module and remote monitoring module information.
As shown in fig. 3, in the present embodiment, the input breaker, the output breaker, and the service breaker are preferably electrically controlled switches (control switch Q1, control switch Q3, and control switch Q2, respectively), the input filter and the output filter are preferably LC filters, the PWM rectifier is preferably an AC/DCPWM bidirectional rectifier, specifically an H-bridge voltage type rectifier, the dc capacitor is composed of a discharge resistor and a dc capacitor connected in parallel, and the inverter is preferably a DA/ACH bridge inverter.
The PWM rectifier comprises a first power switch tube, a second power switch tube, a third power switch tube and a fourth power switch tube, wherein a collector of the first power switch tube is connected with a collector of the second power switch tube, an emitter of the second power switch tube is connected with a collector of the third power switch tube, an emitter of the third power switch tube is connected with an emitter of the fourth power switch tube, a collector of the fourth power switch tube is connected with an emitter of the first power switch tube, and an absorption capacitor is connected in parallel between the collector of the first power switch tube and the emitter of the fourth power switch tube; a live wire at the input side of the low-voltage line is connected with an emitting electrode of the first power switch tube, and a zero line at the input side of the low-voltage line is connected with an emitting electrode of the third power switch tube;
in a preferable scheme, the inverter comprises a fifth power switch tube, a sixth power switch tube, a seventh power switch tube and an eighth power switch tube, wherein a collector of the fifth power switch tube is connected with a collector of the sixth power switch tube, an emitter of the sixth power switch tube is connected with a collector of the seventh power switch tube, an emitter of the seventh power switch tube is connected with an emitter of the eighth power switch tube, a collector of the eighth power switch tube is connected with an emitter of the fifth power switch tube, and an absorption capacitor is connected in parallel between the collector of the fifth power switch tube and the emitter of the eighth power switch tube;
in addition, a collector of the fifth power switch tube is connected with a collector of the second power switch tube, an emitter of the seventh power switch tube is connected with an emitter of the third power switch tube, and a direct-current capacitor is connected in parallel between the collector of the fifth power switch tube and the emitter of the seventh power switch tube; the live wire at the output side of the low-voltage line is connected with the emitter of the fifth power switch tube, and the zero wire at the output side of the low-voltage line is connected with the emitter of the sixth power switch tube.
The absorption capacitor is arranged, so that peak voltage caused by stray inductance in the rectifier and the inverter can be effectively eliminated, and the damage to the rectifier and the inverter is avoided.
In this embodiment, the first power tube, the second power tube and the third power tube are all preferably NPN tubes.
The central control unit comprises a controller and a power supply + sampling + signal conversion board, the controller is connected with the power supply + sampling + signal conversion board, the power supply + sampling + signal conversion board is connected with an AC/DCPWM bidirectional rectifier through a first drive board (namely a drive board 1), and the power supply + sampling + signal conversion board is connected with a DA/ACH bridge inverter through a second drive board (namely a drive board 2).
In addition, in this embodiment, the modulation device further includes a self-checking module connected to the central control unit, where the self-checking module is configured to monitor whether the modulation device has a fault in real time, and if the modulation device has the fault, send a fault identification code to the central control unit.
In this embodiment, the display interface is configured to display the current parameter and the voltage parameter, so that a user can determine whether the low-voltage line is in a low-voltage state or a reactive loss state according to the current parameter and the voltage parameter; and the controller is also used for displaying the fault identification code so that a user can judge whether the modulation device has a fault according to the fault identification code.
In this embodiment, the operation interface is provided with a boost button, a reactive compensation button, a first fault button and a second fault button; the central control unit is used for controlling the modulation device to enter a boosting working mode when a user selects a boosting button on the operation interface, and is also used for controlling the modulation device to enter a reactive compensation working mode when the user selects a reactive compensation button on the operation interface; the input circuit breaker, the output circuit breaker and the overhaul circuit breaker are also used for disconnecting when a user selects the first fault button on the operation interface; and the input breaker and the output breaker are disconnected and the overhaul breaker is closed when the user selects the second fault button on the operation interface.
In this embodiment, the work flow of the modulation apparatus is as follows:
the monitoring component collects voltage parameters and current parameters of the low-voltage line in real time and sends the voltage parameters and the current parameters of the low-voltage line to the central control unit, the central control unit is used for receiving the voltage parameters and the current parameters and sending the voltage parameters and the current parameters to the display interface for display, a user can judge whether the low-voltage line is in a low-voltage state or not according to the interface parameters displayed on the display interface, if the low-voltage line is in the low-voltage state, a boosting button is selected on the operation interface, the central control unit disconnects the maintenance circuit breaker and closes the output circuit breaker, the PWM rectifier, the direct current capacitor and the inverter are connected to the low-voltage line, the modulation device enters a boosting working mode, in the boosting working mode, alternating current transmitted to the user by the power distribution network flows into the PWM rectifier, the alternating current is converted into direct current through the, and then the voltage is filtered by the direct current capacitor and then input into an inverter, and the boosted direct current is converted into alternating current by the inverter and output to a user connected with a low-voltage line after being boosted to a standard value by the inverter.
In addition, a user can also judge whether the low-voltage line has reactive loss according to the voltage parameter and the current parameter on the display interface, if the reactive loss exists, a reactive compensation button is selected on the operation interface, the central control unit closes the maintenance circuit breaker and disconnects the output circuit breaker, the PWM rectifier and the direct current capacitor are connected to the low-voltage line, the modulation device enters a reactive compensation mode to compensate the reactive loss of the low-voltage line, in the reactive compensation mode, the direct current capacitor discharges electricity to the PWM rectifier, and the central control unit controls the PWM rectifier to generate reactive compensation voltage for offsetting the reactive loss amount to perform reactive power compensation on the low-voltage line.
In addition, the user also can judge whether distribution lines have the trouble according to the voltage parameter on the display interface, when judging that distribution lines have the trouble, can select first trouble button on the operation interface, make central control unit control input circuit breaker, output circuit breaker and overhaul the circuit breaker and break off to avoid fault current input to user's department.
In addition, the display interface is also used for displaying a fault identification code, a user can also judge whether the modulation device has a fault according to the fault identification code on the display interface, and when the fault exists, a second fault button can be selected on the operation interface, so that the central control unit controls the input circuit breaker and the output circuit breaker to be both opened, controls the maintenance circuit breaker to be closed, supplies power to a low-voltage line, and ensures normal power utilization of the user.
In summary, the utility model provides a modulation device for distributing station's terminal electric energy parameter of low voltage line is used for breaking the maintenance circuit breaker when the low voltage line is low pressure, and closed output circuit breaker makes PWM rectifier, direct current capacitor, dc-to-ac converter insert the low voltage line, makes modulation device enter the mode of step-up work, steps up the low voltage line; the PWM rectifier and the DC capacitor are connected with the low-voltage line, the modulation device enters a reactive compensation mode, reactive compensation is carried out on the low-voltage line, and therefore the electric energy quality of a low-voltage user side is improved. In addition, the method is accurate and reliable, the manufacturing cost of the device is low, and mass production on engineering is facilitated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A device for modulating the electrical energy parameters at the end of a low voltage line of a power distribution substation, comprising: the maintenance circuit breaker is connected in series on the low-voltage line, and the modulation circuits are connected in parallel on two sides of the maintenance circuit breaker; the modulation circuit comprises a PWM rectifier, an inverter and an output breaker which are sequentially connected in series, a direct-current capacitor is connected between the output end of the PWM rectifier and the input end of the inverter, and the PWM rectifier are both composed of a mosfit/IGBT power electronic integrated circuit;
the modulation device also comprises a central control unit which is respectively connected with the PWM rectifier and the inverter, and the central control unit is used for disconnecting the maintenance circuit breaker and closing the output circuit breaker when the low-voltage line is in a low-voltage state, so that the PWM rectifier, the direct-current capacitor and the inverter are connected to the low-voltage line, and the modulation device enters a boosting working mode; the central control unit is also used for closing an overhaul circuit breaker and disconnecting an output circuit breaker when the low-voltage line has reactive power loss, so that the PWM rectifier and the direct-current capacitor are connected into the low-voltage line, and the modulation device enters a reactive power compensation mode.
2. The device for modulating the electric energy parameter at the end of a low-voltage line of a distribution substation according to claim 1, further comprising an operation interface, wherein the operation interface is connected with the central control unit, a boost button is arranged on the operation interface, and the central control unit is configured to control the modulation device to enter a boost operation mode when a user selects the boost button on the operation interface.
3. The device according to claim 2, wherein the operation interface is further provided with a reactive compensation button, and the central control unit is configured to control the modulation device to enter a reactive compensation mode when a user selects the reactive compensation button on the operation interface.
4. The device according to claim 3, characterized in that said modulation circuit further comprises an input breaker connected in series between said low-voltage line and said input of said PWM rectifier, said operating interface further comprising a first fault button, said central control unit being adapted to open said input breaker, said output breaker and said service breaker when a user selects said first fault button on said operating interface.
5. The device for modulating the power parameters of the low-voltage line ends of distribution substations according to claim 4, characterized in that a second fault button is further provided on said operator interface, and said central control unit is adapted to open said input and output breakers and close said service breaker when a user selects the second fault button on the operator interface.
6. The modulation device of power parameters for the end of a low voltage line of a power distribution substation of claim 5, further comprising a monitoring component connected to said central control unit, said monitoring component configured to collect in real time current parameters and voltage parameters of said low voltage line and send said current parameters and voltage parameters to said central control unit.
7. The modulation device of the electric energy parameters at the end of the low-voltage line of the distribution substation according to claim 6, further comprising a self-checking module connected to the central control unit, wherein the self-checking module is configured to monitor whether the modulation device has a fault in real time, and if the modulation device has a fault, send a fault identification code to the central control unit.
8. The device for modulating the power parameter at the end of a low-voltage line of a distribution substation according to claim 7, further comprising a display interface connected to the central control unit, wherein the display interface is configured to display the current parameter and the voltage parameter for a user to determine whether the low-voltage line is in a low-voltage state or a reactive loss state according to the current parameter and the voltage parameter.
9. The modulation device of claim 8, wherein the display interface is further configured to display a fault identification code for a user to determine whether the modulation device has a fault according to the fault identification code.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020736418.XU CN212304759U (en) | 2020-05-07 | 2020-05-07 | Device for modulating the electrical energy parameters at the end of a low-voltage line for a power distribution area |
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| CN202020736418.XU CN212304759U (en) | 2020-05-07 | 2020-05-07 | Device for modulating the electrical energy parameters at the end of a low-voltage line for a power distribution area |
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