CN114243719A - Automatic voltage regulating device and system for long-distance power supply - Google Patents
Automatic voltage regulating device and system for long-distance power supply Download PDFInfo
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- CN114243719A CN114243719A CN202111607482.3A CN202111607482A CN114243719A CN 114243719 A CN114243719 A CN 114243719A CN 202111607482 A CN202111607482 A CN 202111607482A CN 114243719 A CN114243719 A CN 114243719A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a voltage automatic regulating device and a system for long-distance power supply, wherein the device comprises an AC/DC converter, a DC/AC converter and a compensating transformer, wherein the AC/DC converter acquires the grid voltage and the load current on a power distribution line and generates a first output control voltage according to the DC bus voltage; the DC/AC converter is connected with the AC/DC converter, inverts the DC bus voltage into an AC voltage, and generates a second output control voltage according to the power grid voltage and the load current; the compensation transformer receives the alternating voltage, generates compensation voltage according to the alternating voltage, and transmits the compensation voltage to the distribution line so that the compensation voltage is matched with the voltage drop of the connecting cable. According to the invention, the voltage automatic regulating device is arranged on the power distribution line of the power supply grid and the electric equipment to obtain the voltage parameters of the power distribution line and the grid, so that the output power quality of the power supply and the power quality injected into the grid can be automatically regulated in real time, the stability of the power supply voltage of the electric equipment during long-distance power supply is improved, and the power supply loss is reduced.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to an automatic voltage regulating device and system for long-distance power supply.
Background
In the temporary power utilization system for field construction, the distance between a power supply and power utilization equipment is generally far due to the limitation of field conditions, and a long-distance connecting cable is required to be used. As shown in fig. 1, a topological diagram of a temporary power supply system for field construction includes 1 power grid distribution line and n power consumption equipment distribution lines, and a tree structure is formed between the power grid and the distribution lines. The power supply of the power grid uses a standard public power grid, the power quality of the public power grid meets the local power grid standard, and the power consumption equipment distribution line comprises a connecting cable and power consumption equipment.
However, in this power supply method, since the power consumption of the electric device needs to pass through the long-distance cable, a voltage drop is formed on the inherent impedance (including resistance, self-inductance, mutual inductance, etc.) of the cable, which causes a series of problems such as deterioration of the quality of the power supply power of the electric device, loss on the cable, unstable power supply voltage of the electric device, and high power supply loss when the cable is connected over a long distance. Therefore, how to solve the problems of unstable power supply voltage and high power supply loss of the electric equipment caused by long-distance power supply is a technical problem which needs to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a voltage automatic regulating device and system for long-distance power supply, and aims to solve the technical problems of unstable power supply voltage and high power supply loss of electric equipment caused by long-distance power supply at present.
In order to achieve the above object, the present invention provides an automatic voltage regulator for long distance power supply, the automatic voltage regulator being disposed on a power distribution line between a power grid and a power consumer, the automatic voltage regulator comprising:
the AC/DC converter is arranged on the power distribution line in parallel and used for acquiring the power grid voltage and the load current on the power distribution line and generating a first output control voltage according to the DC bus voltage;
the DC/AC converter is connected with the AC/DC converter and is used for inverting the direct-current bus voltage into alternating-current voltage and generating second output control voltage according to the power grid voltage and the load current;
and the primary side of the compensation transformer is connected with the DC/AC converter and used for receiving the alternating current voltage, and the secondary side of the compensation transformer is connected in series with the distribution line and used for generating a compensation voltage according to the alternating current voltage and transmitting the compensation voltage to the distribution line so as to enable the compensation voltage to be matched with the voltage drop of the connecting cable.
Optionally, the AC/DC converter includes:
the first power grid voltage coordinate transformation and phase-locked loop module is used for processing the power grid voltage and outputting the power grid voltage and the power grid voltage phase of a synchronous rotating coordinate system;
the load current component extraction assembly is used for processing the load current and outputting a load current component;
the direct current bus voltage controller is used for processing the direct current bus voltage and outputting the bus voltage to control an output current inner ring reference value;
and the inner ring controller is used for controlling an inner ring reference value of the output current according to the power grid voltage, the power grid voltage phase, the load current component and the bus voltage of the synchronous rotating coordinate system to generate a first output control voltage.
Optionally, the load current component extracting assembly includes:
the load current reactive component extraction module is used for extracting a load current reactive component in the load current;
and the load current harmonic component extraction module is used for extracting the load current harmonic component in the load current.
Optionally, the inner ring controller includes:
the current inner ring control actual reference value calculating module is used for controlling an output current inner ring reference value according to the load current reactive component, the load current harmonic component and the bus voltage to generate a current inner ring actual reference value;
and the current inner loop control module is used for generating a first output control voltage according to the power grid voltage of the synchronous rotating coordinate system, the current inner loop actual reference value, the power grid voltage phase and the current inner loop real-time value.
Optionally, a connection cable is connected between the power grid and the electric device, the automatic voltage adjustment device is disposed between the power grid and the connection cable, and the DC/AC converter includes:
the second power grid voltage coordinate transformation and phase-locked loop module is used for processing the power grid voltage and outputting the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
and the compensation voltage control module is used for generating a second output control voltage according to the load current, the grid voltage of the synchronous rotating coordinate system, the grid voltage phase and the impedance of the connecting cable.
Optionally, the compensation voltage control module includes:
the load current coordinate transformation module is used for transforming the load current into the load current of the synchronous rotating coordinate system according to the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
the connecting cable compensation voltage calculation module is used for generating a compensation voltage reference value and a compensation voltage device output voltage actual value according to the load current of the synchronous rotating coordinate system and the impedance of the connecting cable;
and the compensation transformer output voltage controller is used for outputting a second output control voltage according to the compensation voltage device output voltage reference value and the compensation voltage device output voltage actual value.
Optionally, a connection cable is connected between the power grid and the electric device, the automatic voltage adjustment device is disposed between the connection cable and the electric device, and the DC/AC converter includes:
the third power grid voltage coordinate transformation and phase-locked loop module is used for processing the power grid voltage and outputting the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
and the compensation voltage control module is used for generating a second output control voltage according to the load voltage, the load voltage reference value, the synchronous rotating coordinate system power grid voltage, the power grid voltage phase and the actual value of the output voltage of the compensation transformer.
Optionally, the compensation voltage control module includes:
the load voltage coordinate transformation module is used for transforming the load voltage into the load voltage of the synchronous rotating coordinate system according to the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
the load voltage controller is used for generating a compensation transformer output voltage reference value according to the load voltage and the load voltage reference value of the synchronous rotating coordinate system;
and the compensating transformer output voltage controller is used for generating a second output control voltage according to the compensating transformer output voltage reference value and the compensating transformer output voltage actual value.
In addition, in order to achieve the above object, the present invention also provides an automatic voltage regulation system for long distance power supply, including the automatic voltage regulation device for long distance power supply as described above, and further including an automatic voltage regulation control device.
Optionally, the voltage automatic adjustment control device further includes:
the power grid voltage acquisition assembly is used for acquiring power grid voltage;
the distribution line parameter acquisition assembly is used for acquiring the load current and the load voltage of the distribution line;
and the voltage automatic adjustment controller is connected with the power grid voltage acquisition assembly and the distribution line parameter acquisition assembly and is used for sending the power grid voltage, the load current, the load voltage and the corresponding control parameters to the voltage automatic adjustment control device.
The device comprises an AC/DC converter, a DC/AC converter and a compensating transformer, wherein the AC/DC converter is connected in parallel to a power distribution line and is used for acquiring the grid voltage and the load current on the power distribution line and generating a first output control voltage according to the DC bus voltage; the DC/AC converter is connected with the AC/DC converter and is used for inverting the direct-current bus voltage into alternating-current voltage and generating second output control voltage according to the power grid voltage and the load current; the primary side of the compensation transformer is connected with the DC/AC converter and used for receiving alternating current voltage, and the secondary side of the compensation transformer is connected in series with the distribution line and used for generating compensation voltage according to the alternating current voltage and transmitting the compensation voltage to the distribution line so that the compensation voltage is matched with the voltage drop of the connecting cable. According to the invention, the voltage automatic regulating device is arranged on the power distribution line of the power supply grid and the electric equipment, and the output electric energy quality of the power supply and the electric energy quality injected into the power grid are automatically regulated in real time by acquiring the grid voltage, the load current and the load voltage, so that the stability of the power supply voltage of the electric equipment during long-distance power supply is improved, and the power supply loss is reduced.
Drawings
Fig. 1 is a topology diagram of a conventional long-distance power supply system;
FIG. 2 is a schematic diagram of a first embodiment of the automatic voltage regulator according to the present invention;
FIG. 3 is a schematic structural diagram of an automatic voltage regulator according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of an AC/DC converter according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of a DC/AC converter according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of an automatic voltage regulation system for long-distance power supply according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram of an automatic voltage regulator according to a second embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an automatic voltage regulator according to a second embodiment of the present invention;
FIG. 9 is a schematic diagram of a DC/AC converter according to a second embodiment of the present invention;
fig. 10 is a schematic structural diagram of an automatic voltage regulation system for long-distance power supply according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the temporary power utilization system for field construction, the distance between a power supply and power utilization equipment is generally far due to the limitation of field conditions, and a long-distance connecting cable is required to be used. As shown in fig. 1, a topological diagram of a temporary power supply system for field construction includes 1 power grid distribution line and n power consumption equipment distribution lines, and a tree structure is formed between the power grid and the distribution lines. The power supply of the power grid uses a standard public power grid, the power quality of the public power grid meets the local power grid standard, and the power consumption equipment distribution line comprises a connecting cable and power consumption equipment.
However, in this power supply method, since the power consumption of the electric device needs to pass through the long-distance cable, a voltage drop is formed on the inherent impedance (including resistance, self-inductance, mutual inductance, etc.) of the cable, which causes a series of problems such as deterioration of the quality of the power supply power of the electric device, loss on the cable, unstable power supply voltage of the electric device, and high power supply loss when the cable is connected over a long distance. Therefore, how to solve the problems of unstable power supply voltage and high power supply loss of the electric equipment caused by long-distance power supply is a technical problem which needs to be solved urgently.
To solve this problem, various embodiments of the voltage automatic adjusting apparatus for long distance power supply of the present invention are proposed. According to the automatic voltage adjusting device for long-distance power supply, the automatic voltage adjusting device is arranged on the power distribution line of the power supply grid and the power consumption equipment, the output power quality of the power supply and the power quality injected into the power grid are automatically adjusted in real time by acquiring the grid voltage, the load current and the load voltage, the stability of the power supply voltage of the power consumption equipment during long-distance power supply is improved, and the power supply loss is reduced.
An embodiment of the present invention provides an automatic voltage regulating device for long-distance power supply, where the automatic voltage regulating device is disposed on a power distribution line between a power grid and an electric device, and referring to fig. 2, fig. 2 is a schematic structural diagram of a first embodiment of the automatic voltage regulating device for long-distance power supply according to the present invention.
In this embodiment, as shown in fig. 3, a connection cable is connected between the power grid and the electric equipment, and the automatic voltage regulating device is located between the power grid and the connection cable and is disposed close to the power grid, and includes an AC/DC converter, a DC/AC converter, and a compensation transformer.
Specifically, as shown in fig. 4, the AC/DC converter is disposed in parallel on the power distribution line, and is configured to obtain a grid voltage and a load current on the power distribution line, and generate a first output control voltage according to a DC bus voltage.
It should be noted that the AC/DC converter is directly connected in parallel to the grid for stabilizing the DC bus voltage, and has the functions of load current harmonics and reactive compensation.
Further, the AC/DC converter comprises a first grid voltage coordinate transformation and phase-locked loop module, a load current component extraction assembly, a direct current bus voltage controller and an inner loop controller. Specifically, the first grid voltage coordinate transformation and phase-locked loop module is used for processing the grid voltage and outputting a grid voltage and a grid voltage phase of a synchronous rotating coordinate system; the load current component extraction assembly is used for processing the load current and outputting a load current component; the direct current bus voltage controller is used for processing the direct current bus voltage and outputting the bus voltage to control an output current inner ring reference value; and the inner ring controller is used for controlling an inner ring reference value of the output current according to the power grid voltage, the power grid voltage phase, the load current component and the bus voltage of the synchronous rotating coordinate system to generate a first output control voltage.
The AC/DC converter may adopt a topological structure, and may be a single-phase system, a three-phase three-wire system, a three-phase four-wire system, and the like according to the connection form of the actual power grid, which is not limited in this embodiment.
The input of the first power grid voltage coordinate transformation and phase-locked loop module is power grid voltage, the output of the first power grid voltage coordinate transformation and phase-locked loop module is synchronous rotating coordinate system power grid voltage Udq and power grid voltage phase, and a traditional coordinate transformation and PI phase tracking method is adopted.
Further, the load current component extraction module comprises a load current reactive component extraction module and a load current harmonic component extraction module. Specifically, the load current reactive component extraction module is used for extracting a load current reactive component in the load current; and the load current harmonic component extraction module is used for extracting the load current harmonic component in the load current.
The load current reactive component extraction module extracts a component of load current perpendicular to the power grid voltage by using the power grid voltage phase through coordinate transformation, and the load current harmonic component extraction module extracts load current harmonic by adopting a fast Fourier transform method.
In some embodiments, the dc bus voltage controller may use a PI controller to achieve the function of position dc bus voltage stabilization.
Further, the inner loop controller comprises a current inner loop control actual reference value calculation module and a current inner loop control module. Specifically, the current inner loop control actual reference value calculation module is used for controlling an output current inner loop reference value according to the load current reactive component, the load current harmonic component and the bus voltage to generate a current inner loop actual reference value; and the current inner loop control module is used for generating a first output control voltage according to the power grid voltage of the synchronous rotating coordinate system, the current inner loop actual reference value, the power grid voltage phase and the current inner loop real-time value.
The current inner loop control actual reference value calculation module considers 3 data such as a load current reactive component, a load current harmonic component, a bus voltage control output current inner loop reference and the like, and the calculation method is that the current inner loop actual reference value is the bus voltage control output current inner loop reference-current reactive component-load current harmonic component; the current inner loop control module can select one of various control methods such as SPWM, SVPWM, hysteresis control and the like according to different circuit topologies.
Specifically, as shown in fig. 5, the DC/AC converter is connected to the AC/DC converter for inverting the DC bus voltage to an AC voltage and generating a second output control voltage according to the grid voltage and the load current.
It should be noted that the DC/AC converter is connected between the parallel ACDC converter and the series compensation transformer, inverts the DC bus voltage into an AC voltage, and controls the output voltage of the series compensation transformer in real time according to the grid voltage and the current of the electrical equipment, so as to compensate the voltage drop formed by the connection cable and ensure the stability of the supply voltage of the electrical equipment.
Further, the DC/AC converter comprises a second grid voltage coordinate transformation and phase locked loop module and a compensation voltage control module. Specifically, the second grid voltage coordinate transformation and phase-locked loop module is used for processing the grid voltage and outputting a grid voltage and a grid voltage phase of a synchronous rotating coordinate system; and the compensation voltage control module is used for generating a second output control voltage according to the load current, the grid voltage of the synchronous rotating coordinate system, the grid voltage phase and the impedance of the connecting cable.
The second grid voltage coordinate transformation and phase-locked loop module and the first grid voltage coordinate transformation and phase-locked loop module adopt the same principle, which is not described in detail in this embodiment.
Furthermore, the compensation voltage control module comprises a load current coordinate transformation module, a connecting cable compensation voltage calculation module and a compensation transformer output voltage controller. Specifically, the load current coordinate transformation module is configured to transform the load current into a load current of the synchronous rotating coordinate system according to the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system; the connecting cable compensation voltage calculation module is used for generating a compensation voltage reference value and a compensation voltage device output voltage actual value according to the load current of the synchronous rotating coordinate system and the impedance of the connecting cable; and the compensation transformer output voltage controller is used for outputting a second output control voltage according to the compensation voltage device output voltage reference value and the compensation voltage device output voltage actual value.
The load current coordinate transformation module transforms the load current to a synchronous rotation coordinate system based on the voltage phase of the power grid; the connecting cable compensation voltage calculation module is used for calculating the connecting cable compensation voltage according to the load current and the connecting cable impedance and converting the connecting cable compensation voltage into a compensation transformer output voltage reference value; the output voltage controller of the compensating transformer outputs voltage control, and one of various control methods such as SPWM, SVPWM, hysteresis control and the like is selected according to different circuit topologies.
Specifically, the primary side of the compensation transformer is connected to the DC/AC converter and is configured to receive the AC voltage, and the secondary side of the compensation transformer is connected in series to the distribution line and is configured to generate a compensation voltage according to the AC voltage and transmit the compensation voltage to the distribution line, so that the compensation voltage is adapted to a voltage drop of a connection cable.
It should be noted that the DC/AC converter is connected between the AC/DC converter and the compensation transformer, inverts the DC bus voltage into an AC voltage, and controls the output voltage of the series compensation transformer in real time according to the grid voltage and the current of the electric device, so as to compensate the voltage drop formed by the connection cable and ensure the stability of the supply voltage of the electric device.
In some embodiments, as shown in fig. 6, there is also provided an automatic voltage regulation system for long-distance power supply, which includes the automatic voltage regulation device and the automatic voltage regulation control device of the above embodiments.
Specifically, the automatic voltage regulation control device comprises a power grid voltage acquisition assembly, a distribution line parameter acquisition assembly and an automatic voltage regulation controller. The power grid voltage acquisition assembly is used for acquiring power grid voltage; the distribution line parameter acquisition assembly is used for acquiring the load current and the load voltage of the distribution line; and the voltage automatic adjustment controller is connected with the power grid voltage acquisition assembly and the distribution line parameter acquisition assembly and is used for sending the power grid voltage, the load current, the load voltage and the corresponding control parameters to the voltage automatic adjustment control device.
It is easy to understand that, the present embodiment utilizes parallel current compensation to realize reactive current compensation and harmonic current compensation, and utilizes series voltage compensation to realize voltage drop compensation of the power distribution line of the electric equipment.
On the basis, the series voltage compensation is connected to a distribution line through a series compensation transformer, and by the design of a compensation voltage range and a transformer transformation ratio, the DCAC converter with smaller capacity can be used for compensating electric equipment with larger capacity, so that the equipment cost is greatly reduced. Meanwhile, compared with the traditional online UPS voltage compensation scheme, the scheme has higher working efficiency because the converter is not transmitted into a power distribution loop, and has high automation degree and convenient use compared with the traditional manual compensation scheme of the magnetic coupling type transformer.
After the voltage automatic regulating device is utilized, the actual power supply voltage of the compensated power distribution line of the electric equipment is higher than the standard voltage of the public power grid, the current flowing through the power distribution loop under the same electric load is reduced, and the loss of a connecting cable is reduced.
In this embodiment, a voltage automatic regulating device and system for long distance power supply is provided, through setting up voltage automatic regulating device between electric wire netting and connecting cable, set up voltage automatic regulating device through the distribution lines at power supply electric wire netting and consumer, through acquireing electric wire netting voltage, load current and load voltage, real-time automatically regulated power supply's output power quality and the power quality of pouring into the electric wire netting, to consumer supply voltage's stability when improving long distance power supply, and reduce the power supply loss.
For easy understanding, referring to fig. 7, fig. 7 is a schematic structural diagram of a second embodiment of the automatic voltage regulating device for long-distance power supply according to the present invention. Based on the first embodiment of the automatic voltage adjustment device for long-distance power supply, the present embodiment proposes a second embodiment of the automatic voltage adjustment device for long-distance power supply, which is specifically as follows:
in this embodiment, as shown in fig. 8, a connection cable is connected between the power grid and the electric equipment, and the automatic voltage adjusting device is located between the connection cable and the electric equipment and is disposed close to the electric equipment, and the automatic voltage adjusting device includes an AC/DC converter, a DC/AC converter, and a compensation transformer.
It should be noted that the arrangement of the AC/DC converter and the compensation transformer is the same as that of the first embodiment, and the description of this embodiment is omitted.
Specifically, as shown in fig. 9, the DC/AC converter is connected to the AC/DC converter, and is configured to invert the DC bus voltage to an AC voltage and generate a second output control voltage according to the grid voltage and the load current.
It should be noted that the DC/AC converter is connected between the parallel ACDC converter and the series compensation transformer, inverts the DC bus voltage into an AC voltage, and controls the output voltage of the series compensation transformer in real time according to the grid voltage and the current of the electrical equipment, so as to compensate the voltage drop formed by the connection cable and ensure the stability of the supply voltage of the electrical equipment.
Further, the DC/AC converter comprises a third grid voltage coordinate transformation and phase locked loop module and a compensation voltage control module. Specifically, the third grid voltage coordinate transformation and phase-locked loop module is used for processing the grid voltage and outputting a grid voltage and a grid voltage phase of a synchronous rotating coordinate system; and the compensation voltage control module is used for generating a second output control voltage according to the load voltage, the load voltage reference value, the synchronous rotating coordinate system power grid voltage, the power grid voltage phase and the actual value of the output voltage of the compensation transformer.
The third grid voltage coordinate transformation and phase-locked loop module and the second grid voltage coordinate transformation and phase-locked loop module adopt the same principle, which is not described in detail in this embodiment.
Furthermore, the compensation voltage control module comprises a load voltage coordinate transformation module, a load voltage controller and a compensation transformer output voltage controller. Specifically, the load voltage coordinate transformation module is configured to transform the load voltage into a load voltage of the synchronous rotating coordinate system according to the grid voltage of the synchronous rotating coordinate system and a grid voltage phase; the load voltage controller is used for generating a compensation transformer output voltage reference value according to the load voltage and the load voltage reference value of the synchronous rotating coordinate system; and the compensating transformer output voltage controller is used for generating a second output control voltage according to the compensating transformer output voltage reference value and the compensating transformer output voltage actual value.
The load voltage coordinate transformation module transforms the load voltage to a synchronous rotation coordinate system based on the power grid voltage phase; the load voltage controller adopts a PI controller to control the load voltage to be standard public power grid voltage; the output voltage controller of the compensating transformer outputs voltage control, and one of various control methods such as SPWM, SVPWM, hysteresis control and the like is selected according to different circuit topologies.
In some embodiments, as shown in fig. 10, there is also provided an automatic voltage regulation system for long-distance power supply, the automatic voltage regulation system including the automatic voltage regulation device and the automatic voltage regulation control device of the above embodiments.
Specifically, the automatic voltage regulation control device comprises a power grid voltage acquisition assembly, a distribution line parameter acquisition assembly and an automatic voltage regulation controller. The power grid voltage acquisition assembly is used for acquiring power grid voltage; the distribution line parameter acquisition assembly is used for acquiring the load current and the load voltage of the distribution line; and the voltage automatic adjustment controller is connected with the power grid voltage acquisition assembly and the distribution line parameter acquisition assembly and is used for sending the power grid voltage, the load current, the load voltage and the corresponding control parameters to the voltage automatic adjustment control device.
It is easy to understand, this embodiment utilizes parallel current compensation to realize reactive current compensation and harmonic current compensation, reduces the connecting cable loss, utilizes series voltage compensation to realize consumer distribution line voltage drop compensation.
On the basis, the series voltage compensation is connected to a distribution line through a series compensation transformer, and by the design of a compensation voltage range and a transformer transformation ratio, the DCAC converter with smaller capacity can be used for compensating electric equipment with larger capacity, so that the equipment cost is greatly reduced. Meanwhile, compared with the traditional online UPS voltage compensation scheme, the scheme has higher working efficiency because the converter is not transmitted into a power distribution loop, and has high automation degree and convenient use compared with the traditional manual compensation scheme of the magnetic coupling type transformer.
In this embodiment, a voltage automatic regulating device and system for long distance power supply is provided, through setting up voltage automatic regulating device between connecting cable and consumer, set up voltage automatic regulating device through the distribution lines at power supply electric wire netting and consumer, through acquireing grid voltage, load current and load voltage, real-time automatically regulated power supply's output power quality and the power quality of pouring into the electric wire netting, to consumer supply voltage's stability when improving long distance power supply, and reduce the power supply loss.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
Claims (10)
1. An automatic voltage regulation device for long-distance power supply, characterized in that the automatic voltage regulation device is arranged on a distribution line between a power grid and a power consumer, and the automatic voltage regulation device comprises:
the AC/DC converter is arranged on the power distribution line in parallel and used for acquiring the power grid voltage and the load current on the power distribution line and generating a first output control voltage according to the DC bus voltage;
the DC/AC converter is connected with the AC/DC converter and is used for inverting the direct-current bus voltage into alternating-current voltage and generating second output control voltage according to the power grid voltage and the load current;
and the primary side of the compensation transformer is connected with the DC/AC converter and used for receiving the alternating current voltage, and the secondary side of the compensation transformer is connected in series with the distribution line and used for generating a compensation voltage according to the alternating current voltage and transmitting the compensation voltage to the distribution line so as to enable the compensation voltage to be matched with the voltage drop of the connecting cable.
2. The automatic voltage regulation device for long distance power supply according to claim 1, wherein the AC/DC converter comprises:
the first power grid voltage coordinate transformation and phase-locked loop module is used for processing the power grid voltage and outputting the power grid voltage and the power grid voltage phase of a synchronous rotating coordinate system;
the load current component extraction assembly is used for processing the load current and outputting a load current component;
the direct current bus voltage controller is used for processing the direct current bus voltage and outputting the bus voltage to control an output current inner ring reference value;
and the inner ring controller is used for controlling an inner ring reference value of the output current according to the power grid voltage, the power grid voltage phase, the load current component and the bus voltage of the synchronous rotating coordinate system to generate a first output control voltage.
3. The automatic voltage regulation device for long distance power supply according to claim 2, wherein the load current component extraction means comprises:
the load current reactive component extraction module is used for extracting a load current reactive component in the load current;
and the load current harmonic component extraction module is used for extracting the load current harmonic component in the load current.
4. The automatic voltage regulation device for long distance power supply according to claim 3, wherein the inner loop controller comprises:
the current inner ring control actual reference value calculating module is used for controlling an output current inner ring reference value according to the load current reactive component, the load current harmonic component and the bus voltage to generate a current inner ring actual reference value;
and the current inner loop control module is used for generating a first output control voltage according to the power grid voltage of the synchronous rotating coordinate system, the current inner loop actual reference value, the power grid voltage phase and the current inner loop real-time value.
5. The automatic voltage regulation device for long distance power supply according to claim 1, wherein a connection cable is connected between the grid and a power consumer, the automatic voltage regulation device is disposed between the grid and the connection cable, and the DC/AC converter comprises:
the second power grid voltage coordinate transformation and phase-locked loop module is used for processing the power grid voltage and outputting the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
and the compensation voltage control module is used for generating a second output control voltage according to the load current, the grid voltage of the synchronous rotating coordinate system, the grid voltage phase and the impedance of the connecting cable.
6. The automatic voltage regulation device for long distance power supply of claim 5, wherein the compensation voltage control module comprises:
the load current coordinate transformation module is used for transforming the load current into the load current of the synchronous rotating coordinate system according to the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
the connecting cable compensation voltage calculation module is used for generating a compensation voltage reference value and a compensation voltage device output voltage actual value according to the load current of the synchronous rotating coordinate system and the impedance of the connecting cable;
and the compensation transformer output voltage controller is used for outputting a second output control voltage according to the compensation voltage device output voltage reference value and the compensation voltage device output voltage actual value.
7. The automatic voltage regulation device for long distance power supply according to claim 1, wherein a connection cable is connected between the grid and an electric device, the automatic voltage regulation device is disposed between the connection cable and the electric device, and the DC/AC converter comprises:
the third power grid voltage coordinate transformation and phase-locked loop module is used for processing the power grid voltage and outputting the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
and the compensation voltage control module is used for generating a second output control voltage according to the load voltage, the load voltage reference value, the synchronous rotating coordinate system power grid voltage, the power grid voltage phase and the actual value of the output voltage of the compensation transformer.
8. The automatic voltage regulation device for long distance power supply of claim 7, wherein the compensation voltage control module comprises:
the load voltage coordinate transformation module is used for transforming the load voltage into the load voltage of the synchronous rotating coordinate system according to the power grid voltage and the power grid voltage phase of the synchronous rotating coordinate system;
the load voltage controller is used for generating a compensation transformer output voltage reference value according to the load voltage and the load voltage reference value of the synchronous rotating coordinate system;
and the compensating transformer output voltage controller is used for generating a second output control voltage according to the compensating transformer output voltage reference value and the compensating transformer output voltage actual value.
9. An automatic voltage regulation system for long-distance power supply, comprising the automatic voltage regulation device for long-distance power supply according to any one of claims 1 to 8, characterized in that the automatic voltage regulation system for long-distance power supply further comprises an automatic voltage regulation control device.
10. The automatic voltage regulation system for long distance power supply according to claim 9, wherein the automatic voltage regulation control means further comprises:
the power grid voltage acquisition assembly is used for acquiring power grid voltage;
the distribution line parameter acquisition assembly is used for acquiring the load current and the load voltage of the distribution line;
and the voltage automatic adjustment controller is connected with the power grid voltage acquisition assembly and the distribution line parameter acquisition assembly and is used for sending the power grid voltage, the load current, the load voltage and the corresponding control parameters to the voltage automatic adjustment control device.
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