CN211428926U - Power transfer device between lines suitable for multiunit multi-circuit line - Google Patents
Power transfer device between lines suitable for multiunit multi-circuit line Download PDFInfo
- Publication number
- CN211428926U CN211428926U CN202020088407.5U CN202020088407U CN211428926U CN 211428926 U CN211428926 U CN 211428926U CN 202020088407 U CN202020088407 U CN 202020088407U CN 211428926 U CN211428926 U CN 211428926U
- Authority
- CN
- China
- Prior art keywords
- series
- group
- voltage source
- compensation devices
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 101
- 238000004804 winding Methods 0.000 claims abstract description 52
- 238000004146 energy storage Methods 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 16
- 230000005611 electricity Effects 0.000 description 11
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
Classifications
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model provides an inter-circuit power transfer device suitable for multi-group multi-circuit circuits, which comprises N groups of series compensation devices, wherein each group of series compensation devices is connected into one group of circuit power transmission channel; each set of series compensation devices includes a series transformer, a bypass switch and a voltage source converter. The first side winding of each series transformer is connected with at least one bypass switch in parallel and then is respectively connected with each circuit of the group of power transmission channels in series, and the three-phase outgoing lines of the second side windings of all the series transformers are connected in parallel in a split-phase manner and then are connected with the alternating-current side branch of the voltage source converter of the group of series compensation devices; and the direct current sides of the voltage source converters of the N groups of series compensation devices are connected in parallel. The utility model provides a power transfer device has simplified the system architecture when guaranteeing the performance, has reduced voltage source transverter's total quantity and total capacity, reduce cost and occupation of land, has reduced the degree of difficulty of control protection to and the reliability of system has been increased.
Description
Technical Field
The utility model belongs to the technical field of flexible alternating current transmission among the electric power system, concretely relates to power transfer device between circuit suitable for multiunit multi-circuit.
Background
The power system is rapidly developed, and with the continuous increase of loads, the increasing complexity of grid structures and the large-scale access of new energy, the problems of uneven power flow distribution, insufficient voltage supporting capability, electromechanical oscillation and the like are often interwoven, so that a new challenge is brought to the operation control of a power grid. Due to saturation of transmission corridors and commercial operation of grid companies, it will become increasingly difficult to increase transmission capacity by building new transmission lines. The continuous increase of user load requires a power flow control means to improve the existing power transmission capability; the complex exchange of power between the booming smart grid and the electricity market requires frequent tidal current control.
The interline Power Flow controller (also called IPFC) is a flexible alternating current transmission device, can control the Power of a plurality of transmission lines, balances the active Power Flow and the reactive Power Flow among a plurality of lines, reduces the burden of an overloaded line through the balance and mediation of the active Power, improves the overall transmission capacity of the plurality of lines, increases the overall compensation effect of a system under dynamic disturbance, and provides an efficient control mode for the Power Flow management of a plurality of lines of a transformer substation.
At present, most of research aiming at the line-to-line power flow controller is to carry out research aiming at a topological structure and a control strategy of a control transfer controller between two single-circuit transmission lines or to equivalently convert a double-circuit line into a single-circuit line. For the line power transfer device applied to the double-circuit power transmission line, because the tidal current optimization problem, the N-1 overcurrent problem and the like can be embodied on the double-circuit line, compensators are required to be arranged on the double-circuit line for tidal current control. Fig. 1 shows a typical structure of an inter-line power transfer device of a double-circuit line power transmission channel, wherein each line needs to be provided with a group of compensation devices for power flow control, and direct current sides of four groups of compensation devices are connected to a common direct current bus. In the structure, because four voltage source converters are connected together, and only one converter can control the stability of the direct-current voltage of the whole device, the unbalanced load flow between the double-circuit lines of one channel can be caused, and the problem can be solved by adopting the scheme shown in the attached figure 2. The structure shown in fig. 2 divides the inter-line power transfer device of the double-circuit power transmission channel into two groups of inter-line power flow controllers, each group comprises two series compensation devices, each group realizes the transfer between one line in the double-circuit power transmission channel, and the two groups of inter-line power flow controllers are coordinated and matched to ensure that the power of the double-circuit power transmission channel is evenly distributed according to impedance and the power transferred by the two groups of inter-line power flow controllers is the same.
The inter-line power transfer devices applied to the double-circuit line power transmission channel shown in the attached drawings 1 and 2 all need four voltage source converters, the occupied area and the cost are high, and the control function is complex to realize. In order to save the investment and floor space of engineering applications, reduce the complexity of the control system and thereby increase the reliability of the system, a simpler and more practical structure is required.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power transfer device between circuit suitable for multiunit transmission of electricity passageway of returning many times, when satisfying the demand of adjusting electric wire netting circuit power transfer, can also improve the operating property, reduce cost and the occupation of land of device, be suitable for the engineering and use.
In order to achieve the above purpose, the utility model discloses a solution is:
the inter-line power transfer device is suitable for multiple groups of multi-circuit power transmission channels, wherein the group number and the return number of the multiple groups of multi-circuit power transmission channels are natural numbers which are more than or equal to 2, and the group number is set to be N groups; the inter-line power transfer device comprises N groups of series compensation devices, and each group of series compensation devices is connected into one group of line power transmission channels. Each group of series compensation devices comprises series transformers, bypass switches and a voltage source converter, the number of the series transformers is the same as the number of the loops of the lines in the corresponding power transmission channel, and the number of the bypass switches is not less than the number of the loops of the lines in the corresponding power transmission channel; wherein: two ends of a first side winding of each series transformer are respectively connected in series with each circuit of the group of power transmission channels, and the first side winding of each series transformer is connected in parallel with at least one bypass switch; three-phase outgoing lines of second side windings of all series transformers are connected in parallel and then connected with an alternating current side branch of a voltage source converter of the group of series compensation devices. And the direct current sides of the voltage source converters of the N groups of series compensation devices are connected in parallel.
As a further preferred aspect of the utility model, work as the structure of multiunit many times circuit transmission of electricity passageway is when two sets of many times circuit transmission of electricity passageway, power transfer device between the circuit, including two sets of series compensation arrangement. The number of the series transformers of the first group of series compensation devices is equal to that of the first group of multi-circuit lines, and the number of the bypass switches of the first group of series compensation devices is not less than that of the first group of multi-circuit lines; the number of the series transformers of the second group of series compensation devices is equal to that of the second group of multi-loop lines, and the number of the bypass switches of the second group of series compensation devices is not less than that of the second group of multi-loop lines. The two ends of the first side windings of all series transformers of each group of series compensation devices are respectively connected in series with the multi-circuit line of the group of transmission channels, and the first side windings of all series transformers are connected in parallel with at least one bypass switch; three-phase outgoing lines of second side windings of all series transformers are connected in parallel and then connected with an alternating current side branch of a voltage source converter of the group of series compensation devices. The voltage source converters of the first group of series compensation devices and the direct current side of the voltage source converters of the second group of series compensation devices are connected in parallel.
As a further preferred aspect of the present invention, when the line power transmission channel structure is two sets of double-circuit line power transmission channels, the power transfer device includes two sets of series compensation devices, each set of series compensation device includes two series transformers, at least two bypass switches, and a voltage source converter; the first group of series compensation devices is connected into the first group of double-circuit line power transmission channels, and the second group of series compensation devices is connected into the second group of double-circuit line power transmission channels. Two ends of first side windings of two series transformers of each group of series compensation device are respectively connected in series with a double-circuit line of the group of transmission channels, and the first side windings of the two series transformers are connected in parallel with at least one bypass switch; and three-phase outgoing lines of second side windings of the two series transformers are connected in parallel and then connected with an alternating-current side branch of a voltage source converter of the group of series compensation devices. The voltage source converters of the first group of series compensation devices and the direct current side of the voltage source converters of the second group of series compensation devices are connected in parallel.
As a further preferred aspect of the present invention, in the above-mentioned power transfer device between circuit that is applicable to multiunit multi-circuit transmission channel, at least a set of series compensation device's voltage source converter is the many level current converter of modularization, including three looks unit, every looks unit includes two branching unit, and every branching unit comprises N1 half-bridge submodule units and N2 full-bridge submodule units in series, and N1 and N2 are natural numbers.
As a further preferred aspect of the present invention, the number N2 of full-bridge sub-module units is smaller than the number N1 of half-bridge sub-module units.
As a further preferred aspect of the present invention, when the line transmission channel structure is two sets of multi-circuit line transmission channels, the voltage source converter of the first series compensation device in the power transfer device between the lines is a modular multilevel converter, including three phase units, each phase unit includes two branch units, each branch unit is formed by connecting N1 half-bridge sub-module units and N2 full-bridge sub-module units in series, and N1 and N2 are natural numbers. The voltage source converter of the second group of series compensation devices is a modular multilevel converter and comprises three phase units, each phase unit comprises two branch units, each branch unit is composed of N3 half-bridge sub-module units, and N3 is a natural number.
As a further preferred aspect of the utility model, the above-mentioned power transfer device between circuit that is applicable to multiunit multi-circuit transmission of electricity passageway still includes a direct current energy storage unit, direct current energy storage unit is connected with each group series compensation arrangement's voltage source transverter's direct current side.
As a further preferred scheme of the utility model, the above-mentioned power transfer device between circuit that is applicable to multiunit multi-circuit transmission of electricity passageway still contains direct current voltage converter, the first side of direct current voltage converter is connected with each group series compensation device's voltage source transverter's direct current side, direct current voltage converter's second side with direct current energy storage unit connects.
As a further preferred aspect of the present invention, the energy storage unit includes at least one of a capacitor, an energy storage battery, a converter, and a UPS uninterruptible power supply.
As the utility model discloses a further preferred scheme, the above-mentioned power transfer device between circuit that is applicable to multiunit multi-circuit transmission of electricity passageway still includes a set of compensation arrangement that connects in parallel, compensation arrangement that connects in parallel includes a voltage source transverter and a parallel transformer. The direct current side of the voltage source converter of the parallel compensation device is connected with the direct current side of the voltage source converter of each group of series compensation devices; the first side of a shunt transformer of the shunt compensation device is connected with the alternating current side of a voltage source converter of the shunt compensation device, and the second side of the shunt transformer is connected with any alternating current bus.
As a further preferred aspect of the present invention, the above-mentioned power transfer device between circuits that is applicable to the multi-group multi-circuit power transmission channel, the bypass switch includes a switch composed of a mechanical switch or a power electronic device.
As a further preferred aspect of the utility model, above-mentioned be applicable to power transfer device between circuit of multiunit many circuit transmission of electricity passageway, the series transformer includes third side winding, third side winding adopts triangle-shaped wiring mode, and second side winding adopts star connection mode.
As a further preferred scheme of the utility model, above-mentioned be applicable to power transfer device between circuit of multiunit multi-circuit line transmission of electricity passageway, N group have M group still to include fixed compensation unit among the series compensation device, wherein 1 is less than or equal to M and is less than or equal to N-1. In the series compensation device comprising the fixed compensation units, the number of the fixed compensation units is the same as the number of the lines in the corresponding power transmission channel; two ends of a first side winding of each series transformer are respectively connected with each circuit of the group of power transmission channels in series, the first side winding of each series transformer is connected with at least one bypass switch in parallel, a three-phase outgoing line of a second side winding of each series transformer is connected with a first side phase of one fixed compensation unit, second side phases of all the fixed compensation units are connected in parallel, and then the second side phases of the fixed compensation units are connected with an alternating current side phase of a voltage source converter of the group of series compensation devices.
As a further preferred aspect of the present invention, the above-mentioned power transfer device between circuits that is applicable to multiunit multi-circuit transmission channel, the fixed compensation unit contains at least one reactor and at least one mechanical switch, each reactor and a mechanical switch parallel connection.
The utility model has the advantages that: the utility model provides a power transfer device between circuit suitable for multiunit is many times circuit transmission of electricity passageway has simplified the system architecture when guaranteeing the performance, has reduced voltage source transverter's total quantity and total capacity, reduce cost and occupation of land, has reduced the degree of difficulty of control protection to and the reliability of system has been increased.
Drawings
Fig. 1 is a schematic diagram of a basic scheme of an inter-line power transfer apparatus applied to a double-circuit line in the prior art, including four voltage source converters, four series transformers, and at least four bypass switches, the dc sides of the four voltage source converters being connected back-to-back;
fig. 2 is a schematic diagram of an engineering utility scheme of an inter-line power transfer device applied to a double-circuit line in the prior art, which includes four voltage source converters, four series transformers, and at least four bypass switches, wherein the voltage source converter corresponding to one of the two groups of double-circuit lines is connected back-to-back on the dc side;
fig. 3 is a schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; in the embodiment, the power transmission channel is a double-circuit line, compared with the figure 1, two voltage source converters are reduced, two series transformers of each group of two circuit lines are connected to one voltage source converter together, and the direct current sides of the two voltage source converters are connected back to back;
fig. 4 is a schematic structural diagram of a modular multilevel converter provided in an embodiment of the present application;
fig. 5 is a second schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; compared with the figure 3, a direct current energy storage unit is added;
fig. 6 is a third schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; compared with the figure 3, a voltage source converter and a parallel transformer are added;
fig. 7 is a fourth schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; the power transmission channel in this embodiment is a three-circuit line, and includes two voltage source converters, six series transformers, and at least four bypass switches, three series transformers of each group of three-circuit line are connected to one voltage source converter, and the dc sides of two voltage source converters are connected back-to-back.
Fig. 8 is a fifth schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; the power transmission channel in the embodiment is provided with three groups of double-circuit lines, and comprises three voltage source converters, six series transformers and at least four bypass switches, wherein two series transformers of each group of double-circuit lines are connected to one voltage source converter together, and direct current sides of the three voltage source converters are connected back to back;
fig. 9 is a sixth schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; a fixed compensation unit is added on the basis of the embodiment of the figure 3;
fig. 10 is a seventh schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; a fixed compensation unit is added on the basis of the embodiment of fig. 8.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings.
The utility model provides an inter-circuit power transfer device suitable for a plurality of groups of multi-circuit power transmission channels, wherein the group number and the return number of the multi-group multi-circuit power transmission channels are natural numbers more than or equal to 2, and the group number is set as N groups; the inter-line power transfer device comprises N groups of series compensation devices, and each group of series compensation devices is connected into one group of line power transmission channels. Each group of series compensation devices comprises series transformers, bypass switches and a voltage source converter, the number of the series transformers is the same as the number of the loops of the lines in the corresponding power transmission channel, and the number of the bypass switches is not less than the number of the loops of the lines in the corresponding power transmission channel; wherein: two ends of a first side winding of each series transformer are respectively connected in series with each circuit of the group of power transmission channels, and the first side winding of each series transformer is connected in parallel with at least one bypass switch; three-phase outgoing lines of second side windings of all series transformers are connected in parallel and then connected with an alternating current side branch of a voltage source converter of the group of series compensation devices. And the direct current sides of the voltage source converters of the N groups of series compensation devices are connected in parallel.
Fig. 3 is a schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit transmission channels according to an embodiment of the present disclosure. The line power transmission channel structure in this embodiment is two sets of double-circuit line power transmission channels, and the power transfer device includes two sets of series compensation devices, each set of series compensation device includes two series transformers 2, at least two bypass switches 1, and a voltage source converter 3.
The first group of series compensation devices is connected to a first double-circuit line power transmission channel, and the second group of series compensation devices is connected to a second double-circuit line power transmission channel. The two groups of series compensation devices have the same structure, taking the first group as an example, two ends of first side windings of two series transformers 2 of the series compensation devices are respectively connected in series with a double-circuit line of a first power transmission channel, and the first side windings of the two series transformers 2 are both connected in parallel with at least one bypass switch 1; three-phase outgoing lines of second side windings of the two series transformers 2 are connected in parallel in a split phase mode and then connected with an alternating current side portion of the voltage source converter 3. The voltage source converters of the first group of series compensation devices and the voltage source converters of the second group of series compensation devices are connected on their direct current sides.
The power transfer device between the lines controls the power of two lines through each voltage source converter 3, because the operating condition of the double-circuit line is basically the same, when the prior art scheme (attached figure 1 and attached figure 2) is adopted, the operating condition of two voltage source converters 3 corresponding to the double-circuit line is basically the same, compared with the prior art scheme, the scheme saves two voltage source converters 3, the wiring mode is simple, the control is simpler and more reliable, and the capacity of each voltage source converter 3 of the scheme is not less than the sum of the capacities of the two voltage source converters 3 required by the double-circuit line of the original scheme.
The voltage source converter 3 of at least one group of series compensation devices is a modular multilevel converter, and as shown in fig. 4, the modular multilevel converter has a structure, the converter includes three phase units, each phase unit includes two branch units, each branch unit is formed by connecting N1 half-bridge sub-module units and N2 full-bridge sub-module units in series, N1 and N2 are both 0 or natural numbers, and the number N2 of the full-bridge sub-module units is less than the number N1 of the half-bridge sub-module units.
The medium voltage source converters of the two series compensation devices can be one modular multilevel converter formed by mixing half-bridge sub-module cells and full-bridge sub-module cells, the other modular multilevel converter formed by all half-bridge sub-module cells, or two modular multilevel converters formed by mixing half-bridge sub-module cells and full-bridge sub-module cells. The specific structure of the modular multilevel converter which is composed of all half-bridge sub-module units is as follows: the phase unit comprises three phase units, each phase unit comprises two branch units, each branch unit is composed of N3 half-bridge submodule units, and N3 is a natural number.
In practical engineering application, each branch unit of the voltage source converter 3 with a large capacity in the two series compensation devices can be a modular multilevel converter formed by mixing full-bridge sub-module units and half-bridge sub-module units, and the proportion of the number of the full-bridge sub-module units and the number of the half-bridge sub-module units can be determined according to the ratio of the capacities of the voltage source converters 3 in the two series compensation devices.
In a preferred scheme, the bypass switches 1 in the two groups of series compensation devices in the inter-line power transfer device include, but are not limited to, mechanical switches and switches formed by power electronic devices; the series transformer 2 in the two groups of series compensation devices further comprises a third side winding, the third side winding adopts a triangular wiring mode, and the second side winding adopts a star-shaped wiring mode.
Fig. 5 is a second schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; compared to the embodiment of fig. 3, a dc energy storage unit 4 is added. The direct current energy storage unit 4 is connected with the direct current sides of the voltage source converters 3 of the two groups of series compensation devices; or, the inter-line power transfer device suitable for the double-circuit line power transmission channel further includes a dc energy storage unit 4 and a dc voltage converter, a first side of the dc voltage converter is connected to the dc sides of the voltage source converters 3 of the two sets of series compensation devices, and a second side of the dc voltage converter is connected to the dc energy storage unit 4; the energy storage unit 4 comprises at least one of a capacitor, an energy storage battery, a converter and a UPS.
Fig. 6 is a third schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; compared to the embodiment of fig. 3, one voltage source converter 3 and one shunt transformer 5 are added. The direct current side of the voltage source converter 3 of the parallel compensation device is connected with the direct current side of the voltage source converter 3 of the two groups of series compensation devices; the ac side of the voltage source converter 3 of the parallel compensation arrangement is connected to the first side of the shunt transformer 5; the second side of the shunt transformer 3 is connected to any ac bus.
Fig. 7 is a fourth schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit transmission channels according to an embodiment of the present application. The power transmission channel in the embodiment is two groups of three-circuit lines, the number of the series transformers 2 of the first group of series compensation devices is equal to that of the first group of multi-circuit lines, and the number of the bypass switches 1 of the first group of series compensation devices is not less than that of the first group of multi-circuit lines; the number of the series transformers 2 of the second group of series compensation devices is equal to that of the second group of multi-circuit lines, and the number of the bypass switches 1 of the second group of series compensation devices is not less than that of the second group of multi-circuit lines; the second side windings of all series transformers 2 of the first set of series compensation means are connected to the ac side branch of the first voltage source converter 3; the second side windings of all series transformers 2 of the second set of series compensation means are connected to the ac side branch of the second voltage source converter 3. Three series transformers of each group of three-circuit lines are connected to a voltage source converter together, and the direct current sides of the two voltage source converters are connected back to back.
Fig. 8 is a fifth schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit transmission channels according to an embodiment of the present application. The power transmission channel in the embodiment is three groups of double-circuit lines, and comprises 3 groups of series compensation devices, wherein each group of series compensation devices is connected to one group of line power transmission channels; the number of the series transformers 2 of each group of the series compensation devices is the same as the number of the lines in the corresponding power transmission channel, and the number of the bypass switches 1 of each group of the series compensation devices is not less than the number of the lines in the corresponding power transmission channel. Two series transformers of each group of double-circuit lines are connected to a voltage source converter together, and the direct current sides of the three voltage source converters are connected back to back.
The utility model is suitable for an among the preferred scheme of power transfer device between circuit of multiunit multi-circuit line transmission of electricity passageway, have M group still including fixed compensation unit among the N group series compensation arrangement, wherein 1 is less than or equal to M and is less than or equal to N-1. In the series compensation device comprising the fixed compensation units, the number of the fixed compensation units is the same as the number of the lines in the corresponding power transmission channel; two ends of a first side winding of each series transformer are respectively connected with each circuit of the group of power transmission channels in series, the first side winding of each series transformer is connected with at least one bypass switch in parallel, a three-phase outgoing line of a second side winding of each series transformer is connected with a first side phase of one fixed compensation unit, second side phases of all the fixed compensation units are connected in parallel, and then the second side phases of the fixed compensation units are connected with an alternating current side phase of a voltage source converter of the group of series compensation devices. The fixed compensation unit comprises at least one reactor and at least one mechanical switch, and each reactor is connected with one mechanical switch in parallel.
Fig. 9 is a sixth schematic view of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; a fixed compensation unit 6 is added to the second series of compensation devices on the basis of the embodiment of fig. 3. The number of the fixed compensation units 6 is the same as the number of the corresponding lines in the power transmission channel, and is 2; two ends of a first side winding of each series transformer 2 are respectively connected with each circuit of the group of power transmission channels in series, the first side winding of each series transformer 2 is connected with at least one bypass switch 1 in parallel, a three-phase outgoing line of a second side winding of each series transformer 2 is connected with a first side phase of one fixed compensation unit 6, and second side phases of all the fixed compensation units 6 are connected in parallel and then connected with an alternating current side phase of a voltage source converter 3 of the group of series compensation devices. Wherein the fixed compensation unit 6 comprises at least one reactor and at least one mechanical switch, each reactor being connected in parallel with one mechanical switch.
Fig. 10 is a seventh schematic diagram of an inter-line power transfer apparatus suitable for multiple sets of multi-circuit power transmission channels according to an embodiment of the present application; a fixed compensation unit 6 is added to the second series of compensation devices on the basis of the embodiment of fig. 8. The number of the fixed compensation units 6 is the same as the number of the corresponding lines in the power transmission channel, and is 2; two ends of a first side winding of each series transformer 2 are respectively connected with each circuit of the group of power transmission channels in series, the first side winding of each series transformer 2 is connected with at least one bypass switch 1 in parallel, a three-phase outgoing line of a second side winding of each series transformer 2 is connected with a first side phase of one fixed compensation unit 6, and second side phases of all the fixed compensation units 6 are connected in parallel and then connected with an alternating current side phase of a voltage source converter 3 of the group of series compensation devices. Wherein the fixed compensation unit 6 comprises at least one reactor and at least one mechanical switch, each reactor being connected in parallel with one mechanical switch.
Finally, it should be noted that: the technical solutions of the present invention are only described in connection with the above embodiments, and not limited thereto. Those of ordinary skill in the art will understand that: modifications and equivalents of the embodiments of the invention may occur to those skilled in the art, but are intended to be within the scope of the claims appended hereto.
Claims (15)
1. The power transfer device is suitable for the power transfer device between the lines of a plurality of groups of multi-circuit lines, the group number and the circuit number of the power transmission channels of the plurality of groups of multi-circuit lines are natural numbers which are more than or equal to 2, and the group number is set to be N groups; the method is characterized in that: the power transfer device between the lines comprises N groups of series compensation devices, and each group of series compensation devices is connected into one group of line power transmission channels;
each group of series compensation devices comprises series transformers, bypass switches and a voltage source converter, the number of the series transformers is the same as the number of the loops of the lines in the corresponding power transmission channel, and the number of the bypass switches is not less than the number of the loops of the lines in the corresponding power transmission channel; wherein: two ends of a first side winding of each series transformer are respectively connected in series with each circuit of the group of power transmission channels, and the first side winding of each series transformer is connected in parallel with at least one bypass switch; three-phase outgoing lines of second side windings of all series transformers are connected in parallel and then connected with an alternating current side branch of a voltage source converter of the group of series compensation devices;
and the direct current sides of the voltage source converters of the N groups of series compensation devices are connected in parallel.
2. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: when the structure of the multiple groups of multi-circuit power transmission channels is two groups of multi-circuit power transmission channels, the inter-circuit power transfer device comprises two groups of series compensation devices;
the number of the series-connection transformers of the first group of series-connection compensation devices is equal to that of the first group of multi-circuit lines, and the number of the bypass switches of the first group of series-connection compensation devices is not less than that of the first group of multi-circuit lines; the number of the series connection transformers of the second group of series compensation devices is equal to that of the second group of multi-circuit lines, and the number of the bypass switches of the second group of series compensation devices is not less than that of the second group of multi-circuit lines;
the two ends of the first side windings of all series transformers of each group of series compensation devices are respectively connected in series with the multi-circuit line of the group of transmission channels, and the first side windings of all series transformers are connected in parallel with at least one bypass switch; three-phase outgoing lines of second side windings of all series transformers are connected in parallel and then connected with an alternating current side branch of a voltage source converter of the group of series compensation devices;
the voltage source converters of the first group of series compensation devices and the direct current side of the voltage source converters of the second group of series compensation devices are connected in parallel.
3. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: when the line power transmission channel structure is two groups of double-circuit line power transmission channels, the power transfer device comprises two groups of series compensation devices, and each group of series compensation devices comprises two series transformers, at least two bypass switches and a voltage source converter; the first group of series compensation devices are connected into the first group of double-circuit line power transmission channels, and the second group of series compensation devices are connected into the second group of double-circuit line power transmission channels;
two ends of first side windings of two series transformers of each group of series compensation device are respectively connected in series with a double-circuit line of the group of transmission channels, and the first side windings of the two series transformers are connected in parallel with at least one bypass switch; three-phase outgoing lines of second side windings of the two series transformers are connected in parallel and then connected with an alternating-current side branch of a voltage source converter of the group of series compensation devices;
the voltage source converters of the first group of series compensation devices and the direct current side of the voltage source converters of the second group of series compensation devices are connected in parallel.
4. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: the voltage source converter of at least one group of series compensation devices is a modular multilevel converter and comprises three phase units, each phase unit comprises two branch units, each branch unit is formed by connecting N1 half-bridge sub-module units and N2 full-bridge sub-module units in series, and N1 and N2 are natural numbers.
5. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 4, wherein: the number of full-bridge sub-module cells N2 is smaller than the number of half-bridge sub-module cells N1.
6. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 2, wherein: the voltage source converter of the first group of series compensation devices is a modular multilevel converter and comprises three phase units, each phase unit comprises two branch units, each branch unit is formed by connecting N1 half-bridge sub-module units and N2 full-bridge sub-module units in series, and N1 and N2 are natural numbers;
the voltage source converter of the second group of series compensation devices is a modular multilevel converter and comprises three phase units, each phase unit comprises two branch units, each branch unit is composed of N3 half-bridge sub-module units, and N3 is a natural number.
7. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 3, wherein: the voltage source converter of the first group of series compensation devices is a modular multilevel converter and comprises three phase units, each phase unit comprises two branch units, each branch unit is formed by connecting N1 half-bridge sub-module units and N2 full-bridge sub-module units in series, and N1 and N2 are natural numbers;
the voltage source converter of the second group of series compensation devices is a modular multilevel converter and comprises three phase units, each phase unit comprises two branch units, each branch unit is composed of N3 half-bridge sub-module units, and N3 is a natural number.
8. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: the direct current energy storage unit is connected with the direct current side of the voltage source converter of each group of series compensation devices.
9. The device according to claim 8, further comprising a dc voltage converter, wherein a first side of the dc voltage converter is connected to the dc side of the voltage source converter of each series compensation device, and a second side of the dc voltage converter is connected to the dc energy storage unit.
10. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 8, wherein: the energy storage unit comprises at least one of a capacitor, an energy storage battery, a converter and a UPS.
11. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: the parallel compensation device comprises a voltage source converter and a parallel transformer;
the direct current side of the voltage source converter of the parallel compensation device is connected with the direct current side of the voltage source converter of each group of series compensation devices; the first side of a shunt transformer of the shunt compensation device is connected with the alternating current side of a voltage source converter of the shunt compensation device, and the second side of the shunt transformer is connected with any alternating current bus.
12. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: the bypass switch may comprise a mechanical switch or a switch formed by power electronics.
13. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 1, wherein: the series transformer comprises a third side winding, the third side winding adopts a triangular wiring mode, and the second side winding adopts a star connection mode.
14. The inter-line power transfer apparatus for multiple sets of multi-circuit lines as claimed in any one of claims 1 to 13, wherein: m groups of the N groups of series compensation devices also comprise fixed compensation units, wherein M is more than or equal to 1 and less than or equal to N-1;
in the series compensation device comprising the fixed compensation units, the number of the fixed compensation units is the same as the number of the lines in the corresponding power transmission channel; two ends of a first side winding of each series transformer are respectively connected with each circuit of the group of power transmission channels in series, the first side winding of each series transformer is connected with at least one bypass switch in parallel, a three-phase outgoing line of a second side winding of each series transformer is connected with a first side phase of one fixed compensation unit, second side phases of all the fixed compensation units are connected in parallel, and then the second side phases of the fixed compensation units are connected with an alternating current side phase of a voltage source converter of the group of series compensation devices.
15. The inter-line power transfer apparatus for multiple sets of multi-loop lines of claim 14, wherein: the fixed compensation unit comprises at least one reactor and at least one mechanical switch, and each reactor is connected with one mechanical switch in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020088407.5U CN211428926U (en) | 2020-01-15 | 2020-01-15 | Power transfer device between lines suitable for multiunit multi-circuit line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020088407.5U CN211428926U (en) | 2020-01-15 | 2020-01-15 | Power transfer device between lines suitable for multiunit multi-circuit line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211428926U true CN211428926U (en) | 2020-09-04 |
Family
ID=72245544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020088407.5U Withdrawn - After Issue CN211428926U (en) | 2020-01-15 | 2020-01-15 | Power transfer device between lines suitable for multiunit multi-circuit line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211428926U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276991A (en) * | 2020-01-15 | 2020-06-12 | 南京南瑞继保电气有限公司 | Power transfer device between circuit suitable for multiunit multi-circuit line |
-
2020
- 2020-01-15 CN CN202020088407.5U patent/CN211428926U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276991A (en) * | 2020-01-15 | 2020-06-12 | 南京南瑞继保电气有限公司 | Power transfer device between circuit suitable for multiunit multi-circuit line |
| CN111276991B (en) * | 2020-01-15 | 2024-06-18 | 南京南瑞继保电气有限公司 | Inter-circuit power transfer device suitable for multiple groups of multi-circuit circuits |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113364311B (en) | Multi-medium-voltage alternating-current port solid-state transformer and control method thereof | |
| CN104124682A (en) | Convertible unified power flow controller | |
| CN102983577A (en) | Convertible static compensator provided with modular multilevel converter structure | |
| CN111049147B (en) | Hybrid compensation type inter-circuit power transfer device and control method thereof | |
| CN213585162U (en) | AC/DC power supply structure of data center | |
| CN110556833A (en) | Multi-port microgrid energy router | |
| CN104065063A (en) | Unified power flow controller suitable for multiple lines | |
| CN112886594A (en) | AC/DC power supply structure of data center | |
| CN102904420A (en) | Multi-port current transformer | |
| CN211428926U (en) | Power transfer device between lines suitable for multiunit multi-circuit line | |
| CN111934324B (en) | Multifunctional power flow controller suitable for multi-channel double-loop | |
| CN113708377A (en) | High-voltage asynchronous flexible interconnection device sharing direct-current bus | |
| CN111276991B (en) | Inter-circuit power transfer device suitable for multiple groups of multi-circuit circuits | |
| CN212435428U (en) | Uninterruptible power supply | |
| CN211456702U (en) | Hybrid compensation type inter-line power transfer device | |
| CN203039365U (en) | Interline power flow controller based on modularized multi-level transverter | |
| CN202949227U (en) | Convertible static compensator employing modularization multi-level converter structure | |
| CN204578373U (en) | A kind of High Frequency Link many level DCs transformer for mesolow DC distribution | |
| CN216215929U (en) | Alternating current-direct current multiport power distribution system for office residential area | |
| CN203166539U (en) | HVDC and UPFC system based on modularized multilevel converter | |
| CN115483683A (en) | Flexible alternating-current loop closing device and system | |
| CN113595397B (en) | Multi-port energy router with high-frequency voltage-sharing collection bus | |
| CN113328454B (en) | Flexible multi-state switch, flexible alternating current-direct current interconnection system and control method | |
| CN114223127A (en) | Power supply system | |
| CN112202173B (en) | Medium-voltage bus flexible interconnection power distribution network system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200904 Effective date of abandoning: 20240618 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20200904 Effective date of abandoning: 20240618 |