CN111934324A - Multifunctional power flow controller suitable for multi-channel double-loop - Google Patents
Multifunctional power flow controller suitable for multi-channel double-loop Download PDFInfo
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- CN111934324A CN111934324A CN202011083584.5A CN202011083584A CN111934324A CN 111934324 A CN111934324 A CN 111934324A CN 202011083584 A CN202011083584 A CN 202011083584A CN 111934324 A CN111934324 A CN 111934324A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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Abstract
The invention provides a multi-functional power flow controller suitable for a multi-channel double-loop, which comprises an MMC1 and an MMC2 which are connected back to back, 4 controllable switches S1-S4, 8 transformers T1-T8 and a control circuit for controlling the actions of the MMC1, the MMC2 and the controllable switches S1-S4; the alternating current end of the MMC1 is electrically connected with the transformers T2 and T3 arranged on the first double-loop line through the controllable switch S1 and the transformer T1 and is electrically connected with the bus through the controllable switch S2 and the transformer T7, and the alternating current end of the MMC2 is electrically connected with the transformers T5 and T6 arranged on the second double-loop line through the controllable switch S4 and the transformer T4 and is electrically connected with the bus through the controllable switch S3 and the transformer T8. When the invention is used, the UPFC or IPFC working mode can be correspondingly switched according to the power flow control requirement of the power grid, so that the invention realizes multiple purposes, thereby reducing the arrangement quantity and cost of power flow control equipment of the power grid.
Description
Technical Field
The invention relates to the technical field of power grid power flow control devices, in particular to a multifunctional power flow controller suitable for a multi-channel double-loop.
Background
With the continuous expansion of the scale of the power grid and the increasing new energy power generation grid connection, the structure of the power grid is increasingly complex, and higher requirements are provided for the stable and reliable operation of the power grid. Flexible AC Transmission Systems (FACTS) are a power Transmission and distribution system capable of flexibly controlling line power flow, and have an extremely important meaning for ultra-high voltage long-distance power Transmission. Unified Power Flow Controllers (UPFC) and Interline Power Flow Controllers (IPFC) are all commonly used controllers in FACTS, the UPFC is the FACTS Controller with the most comprehensive functions at present and has different functions of parallel compensation, series compensation, phase shift, terminal voltage regulation and the like; and the IPFC can provide series active and reactive compensation for each transmission line independently, can also realize power transmission among the transmission lines, and transmits the power of a heavy-load line to a light-load line. UPFC and IPFC all are equipped with Voltage Source Converter (VSC), and the topological structure of VSC is various at present, compares with the VSC of other types, and VSC based on many level of modularization transverter (MMC) has characteristics such as switching loss is little, the waveform quality is high, fault handling capacity is strong, but rapid adjustment active and reactive power because of the MMC, obtains extensive application at flexible alternating current transmission system.
Most of power grids above 110kV adopt a double-circuit line structure, and the current flow control of the double-circuit line by using an FACTS controller is generally performed by the following steps: setting UPFC on single double circuit line to control active and reactive power and regulate and control bus terminal voltage; IPFC is arranged among a plurality of double-circuit lines to realize power transmission among transmission lines, the power of a heavy-load line is transmitted to a light-load line, and the power flow is regulated and controlled through power exchange among the lines. Although the existing method of utilizing FACTS controllers to control the power flow of the double-circuit line is effective, the FACTS controllers adopted by the existing FACTS controllers are relatively large in number, and the cost of control equipment is relatively high, so that it is necessary to continuously improve the existing power flow controllers to reduce the cost of arrangement.
Disclosure of Invention
The purpose of the invention is: aiming at the problems in the prior art, the multifunctional power flow controller suitable for the multi-channel double-loop is provided, the multifunctional power flow controller has the functions of both UPFC and IPFC, when in use, the corresponding UPFC or IPFC working mode can be switched according to different power flow control requirements of a power grid, the multiple purposes of one device are realized, and the arrangement quantity and the cost of power flow control equipment of the power grid are reduced.
The technical scheme of the invention is as follows: the invention discloses a multifunctional power flow controller suitable for a multi-channel double-loop, which comprises a first converter MMC1 and a second converter MMC2, wherein the first converter MMC1 and the second converter MMC2 are respectively provided with an alternating current end, a direct current end and a control end, the direct current end of the first converter MMC1 is electrically connected with the direct current end of the second converter MMC2, and the multifunctional power flow controller is structurally characterized in that: the system also comprises 4 controllable switches S1-S4 from the first to the fourth, 8 transformers T1-T8 from the first to the eighth and a control circuit for controlling the actions of the first converter MMC1, the second converter MMC2 and the first to the fourth controllable switches S1-S4;
the alternating current terminal of the first converter MMC1 is electrically connected to the secondary side of the first transformer T1 and the secondary side of the seventh transformer T7 through the first controllable switch S1 and the second controllable switch S2, respectively, and the primary side of the first transformer T1 is electrically connected to the secondary sides of the second transformer T2 and the third transformer T3; an alternating current end of the second converter MMC2 is correspondingly and electrically connected with a secondary side of the fourth transformer T4 and a secondary side of the eighth transformer T8 through a fourth controllable switch S4 and a third controllable switch S3, respectively, and a primary side of the fourth transformer T4 is electrically connected with secondary sides of the fifth transformer T5 and the sixth transformer T6; the control ends of the first converter MMC1 and the second converter MMC2 and the controllable switches S1-S4 are electrically connected with a control circuit; when the transformer is used, the primary sides of the seventh transformer T7 and the eighth transformer T8 are electrically connected with a bus LM of a power grid; the primary sides of the second transformer T2 and the third transformer T3 are connected in series to 2 power transmission lines of the first dual-loop line HL1, respectively, and the primary sides of the fifth transformer T5 and the sixth transformer T6 are connected in series to 2 power transmission lines of the second dual-loop line HL2, respectively.
The further scheme is as follows: the first to fourth controllable switches S1 to S4 are all isolation switches.
The further scheme is as follows: when the control circuit opens the second controllable switch S2 and the third controllable switch S3 and closes the first controllable switch S1 and the fourth controllable switch S4, the multifunctional power flow controller suitable for the multi-channel double-loop is a power flow controller in an IPFC operation mode.
The further scheme is as follows: when the control circuit disconnects the second controllable switch S2 and the fourth controllable switch S4 and closes the first controllable switch S1 and the third controllable switch S3, the multi-functional power flow controller for multi-channel dual-loop is a power flow controller in a UPFC operating mode, which regulates and controls the first dual-loop line HL1 and the bus LM.
The further scheme is as follows: when the control circuit opens the first controllable switch S1 and the third controllable switch S3 and closes the second controllable switch S2 and the fourth controllable switch S4, the multi-functional power flow controller for multi-channel double-loop is a power flow controller in a UPFC operating mode, which regulates and controls the second double-loop line HL2 and the bus LM.
The invention has the positive effects that: (1) the multifunctional power flow controller suitable for the multi-channel double-loop has the functions of the UPFC and the IPFC through the overall topological structure design, and can switch the corresponding UPFC or IPFC working modes according to different power flow control requirements of a power grid when in use, so that one device has multiple functions, the arrangement quantity of power flow control equipment of the power grid can be effectively reduced, and the distribution and operation maintenance cost of the power flow control equipment is greatly reduced. (2) The multifunctional power flow controller suitable for the multi-channel double-loop adopts a modular multilevel MMC as a current converter of a core device, and has the advantages of small switching loss, high waveform quality, strong fault processing capacity and capability of quickly adjusting active power and reactive power.
Drawings
FIG. 1 is a schematic view of the topology of the present invention, which also shows the electrical connection relationship between the bus LM and the two parallel dual-circuit lines HL1 and HL2 when in use;
fig. 2 is a schematic topology diagram of the first converter MMC1 in fig. 1;
fig. 3 is a schematic view of a topology of a sub-module SMN in fig. 2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
(example 1)
Referring to fig. 1, the multi-functional power flow controller suitable for a multi-channel dual-circuit of this embodiment mainly includes a first converter MMC1, a second converter MMC2, 4 controllable switches S1 to S4 from the first to the fourth, 8 transformers T1 to T8 from the first to the eighth, and a control circuit for controlling actions of the first converter MMC1, the second converter MMC2, and the controllable switches S1 to S4.
The first converter MMC1 and the second converter MMC2 are both provided with an alternating current end, a direct current end and a control end; the direct-current end of the first converter MMC1 is electrically connected with the direct-current end of the second converter MMC 2; an alternating current end of the first converter MMC1 is correspondingly and electrically connected with a secondary side of the first transformer T1 and a secondary side of the seventh transformer T7 through a first controllable switch S1 and a second controllable switch S2 respectively, and a primary side of the first transformer T1 is electrically connected with a secondary side of the second transformer T2 and a secondary side of the third transformer T3; an alternating current end of the second converter MMC2 is correspondingly and electrically connected with a secondary side of the fourth transformer T4 and a secondary side of the eighth transformer T8 through a fourth controllable switch S4 and a third controllable switch S3, respectively, and a primary side of the fourth transformer T4 is electrically connected with secondary sides of the fifth transformer T5 and the sixth transformer T6; the control ends of the first converter MMC1 and the second converter MMC2 and the controllable switches S1-S4 are electrically connected with the control circuit, and the control ends of the first converter MMC1 and the second converter MMC2 and the on-off states of the controllable switches S1-S4 are correspondingly controlled by the control circuit.
When the multifunctional power flow controller suitable for the multi-channel double-loop power flow controller is used, the primary sides of the seventh transformer T7 and the eighth transformer T8 are electrically connected with a bus LM of a power grid; the primary sides of the second transformer T2 and the third transformer T3 are connected in series to 2 power transmission lines of the first dual-loop line HL1, and the primary sides of the fifth transformer T5 and the sixth transformer T6 are connected in series to 2 power transmission lines of the second dual-loop line HL 2.
The controllable switches S1-S4 are preferably commercially available disconnectors in this embodiment.
Referring to fig. 2, the first converter MMC1 is composed of 6 arms from the first to the sixth, each arm is composed of N cascaded submodules SM 1-SMN with the same structure and a reactor L1; the first bridge arm is connected in series with a reactor L1 of the second bridge arm through a reactor L1 of the first bridge arm, a common connection point of the first bridge arm forms an alternating current end A phase of a first converter MMC1, the third bridge arm is connected in series with a reactor L1 of the fourth bridge arm through a reactor L1 of the third bridge arm, a common connection point of the third bridge arm forms an alternating current end B phase of a first converter MMC1, the fifth bridge arm is connected in series with a reactor L1 of the sixth bridge arm through a reactor L1 of the fifth bridge arm, and a common connection point of the fifth bridge arm forms an alternating current end C phase of a first; one end of the sub-modules SM1 of the first, third and fifth bridge arms, which is not cascaded, is provided with a common joint, and the common joint forms a direct-current end positive stage of the first converter MMC 1; the non-cascaded ends of the submodules SMN of the second, fourth and sixth legs have a common junction, which forms the dc-side negative stage of the first converter MMC 1. The structure and the operation principle of the first converter MMC1 are mature prior art and will not be described in detail. The second inverter MMC2 is identical in structure.
Referring to fig. 3, the submodule SMN of the first converter MMC1 is a half-bridge structure, and is composed of 2 IGBTs of Q1 and Q2, 2 antiparallel diodes of D1 and D2, and an electrolytic capacitor C1 for providing voltage support for the submodule. The gates of the IGBTs in each sub-module together form a control terminal of the first inverter MMC1, which is not described in detail in the prior art. The structure and the working principle of the sub-module SMN are also mature prior art and are not described in detail.
Still referring to fig. 1, the operation principle and process of the multifunctional power flow controller suitable for multi-channel dual-loop of the present embodiment are briefly described as follows.
When the control circuit turns off all the controllable switches S1, S2, S3 and S4, the multifunctional power flow controller of the embodiment is in an inactive state.
When the control circuit turns off the controllable switches S2 and S3 and turns on the controllable switches S1 and S4, the multifunctional power flow controller of this embodiment is in an IPFC operating mode, and can provide active and reactive power compensation for the first dual-loop line HL1 or the second dual-loop line HL2, and at the same time, can also realize power exchange between the first dual-loop line HL1 and the second dual-loop line HL2, and transfer the power of the heavy load line to the light load line.
When the control circuit turns off the controllable switches S2 and S4 and turns on the controllable switches S1 and S3, the multifunctional power flow controller of this embodiment is in the UPFC operating mode, and the controlled line is the first dual-loop line HL 1. Wherein, first transverter MMC1 is the series connection transverter, and second transverter MMC2 is the parallel connection transverter, can accomplish the active power, reactive power's to first double loop circuit HL1 control through first transverter MMC1, can accomplish the voltage regulation and control to bus LM through second transverter MMC 2.
When the control circuit disconnects the controllable switches S1 and S3 and closes the controllable switches S2 and S4, the multifunctional power flow controller of the embodiment is in a UPFC operating mode, the controlled line is a second double-loop line HL2, wherein the second converter MMC2 is a series converter, the first converter MMC1 is a parallel converter, active power and reactive power of the second double-loop line HL2 can be controlled through the second converter MMC2, and voltage regulation and control of the bus LM can be completed through the first converter MMC 1.
It can be known from the foregoing that, the multifunctional power flow controller suitable for a multi-channel double-loop in this embodiment can conveniently realize switching of working modes of the multifunctional power flow controller UPFC and IPFC of this embodiment by controlling the open and close of the 4 controllable switches S1-S4 through the control circuit according to different power flow regulation and control requirements, and realize "one device is multi-purpose", thereby effectively reducing the number of arranged power flow control devices in a power grid, greatly reducing the cost of laying and operating and maintaining the power flow control devices, and meanwhile, the current converter serving as a core device adopts a modular multilevel MMC, which has the advantages of small switching loss, high waveform quality, strong fault handling capability, and capability of quickly adjusting active power and reactive power.
The above embodiments are illustrative of specific embodiments of the present invention, and are not restrictive of the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a multi-functional power flow controller suitable for multichannel double loop, includes first transverter MMC1 and second transverter MMC2 that are equipped with alternating current end, direct current end and control end respectively, the direct current end of first transverter MMC1 is connected its characterized in that with the direct current end electricity of second transverter MMC 2: the system also comprises 4 controllable switches S1-S4 from the first to the fourth, 8 transformers T1-T8 from the first to the eighth and a control circuit for controlling the actions of the first converter MMC1, the second converter MMC2 and the first to the fourth controllable switches S1-S4;
the alternating current end of the first converter MMC1 is correspondingly and electrically connected with the secondary side of the first transformer T1 and the secondary side of the seventh transformer T7 through a first controllable switch S1 and a second controllable switch S2 respectively, and the primary side of the first transformer T1 is electrically connected with the secondary sides of the second transformer T2 and the third transformer T3; an alternating current end of the second converter MMC2 is correspondingly and electrically connected with a secondary side of the fourth transformer T4 and a secondary side of the eighth transformer T8 through a fourth controllable switch S4 and a third controllable switch S3, respectively, and a primary side of the fourth transformer T4 is electrically connected with secondary sides of the fifth transformer T5 and the sixth transformer T6; the control ends of the first converter MMC1 and the second converter MMC2 and the controllable switches S1-S4 are electrically connected with a control circuit; when the transformer is used, the primary sides of the seventh transformer T7 and the eighth transformer T8 are electrically connected with a bus LM of a power grid; the primary sides of the second transformer T2 and the third transformer T3 are connected in series to 2 power transmission lines of the first dual-loop line HL1, respectively, and the primary sides of the fifth transformer T5 and the sixth transformer T6 are connected in series to 2 power transmission lines of the second dual-loop line HL2, respectively.
2. The multi-function power flow controller for multi-channel dual-loop as claimed in claim 1, wherein: the first to fourth controllable switches S1-S4 are all isolating switches.
3. The multi-function power flow controller for multi-channel dual-loop as claimed in claim 1, wherein: when the control circuit opens the second controllable switch S2 and the third controllable switch S3 and closes the first controllable switch S1 and the fourth controllable switch S4, the multifunctional power flow controller suitable for the multi-channel double loop is a power flow controller of an IPFC working mode.
4. The multi-function power flow controller for multi-channel dual-loop as claimed in claim 1, wherein: when the control circuit disconnects the second controllable switch S2 and the fourth controllable switch S4 and closes the first controllable switch S1 and the third controllable switch S3, the multifunctional power flow controller suitable for the multi-channel double-loop is a power flow controller which implements a regulated UPFC working mode on the first double-loop line HL1 and the bus bar LM.
5. The multi-function power flow controller for multi-channel dual-loop as claimed in claim 1, wherein: when the control circuit opens the first controllable switch S1 and the third controllable switch S3 and closes the second controllable switch S2 and the fourth controllable switch S4, the multifunctional power flow controller suitable for the multi-channel double-loop is a power flow controller which implements a regulated UPFC working mode on the second double-loop line HL2 and the bus bar LM.
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| CN202011083584.5A CN111934324B (en) | 2020-10-12 | 2020-10-12 | Multifunctional power flow controller suitable for multi-channel double-loop |
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| CN202011083584.5A CN111934324B (en) | 2020-10-12 | 2020-10-12 | Multifunctional power flow controller suitable for multi-channel double-loop |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036800A (en) * | 2021-05-06 | 2021-06-25 | 贵州电网有限责任公司 | Flexible interconnected transformer substation structure and control method |
| CN113541148A (en) * | 2021-06-30 | 2021-10-22 | 国网浙江省电力有限公司电力科学研究院 | Distributed direct current power flow controller |
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| CN102983577A (en) * | 2012-07-13 | 2013-03-20 | 中电普瑞科技有限公司 | Convertible static compensator provided with modular multilevel converter structure |
| DE102012005854A1 (en) * | 2012-03-22 | 2013-09-26 | Diehl Aerospace Gmbh | Electric supply device |
| CN106159942A (en) * | 2016-07-25 | 2016-11-23 | 许继集团有限公司 | MMC UPFC system and series side inverter stoppage in transit method thereof |
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2020
- 2020-10-12 CN CN202011083584.5A patent/CN111934324B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012005854A1 (en) * | 2012-03-22 | 2013-09-26 | Diehl Aerospace Gmbh | Electric supply device |
| CN102983577A (en) * | 2012-07-13 | 2013-03-20 | 中电普瑞科技有限公司 | Convertible static compensator provided with modular multilevel converter structure |
| CN106159942A (en) * | 2016-07-25 | 2016-11-23 | 许继集团有限公司 | MMC UPFC system and series side inverter stoppage in transit method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113036800A (en) * | 2021-05-06 | 2021-06-25 | 贵州电网有限责任公司 | Flexible interconnected transformer substation structure and control method |
| CN113036800B (en) * | 2021-05-06 | 2023-05-23 | 贵州电网有限责任公司 | Flexible interconnection substation structure and control method |
| CN113541148A (en) * | 2021-06-30 | 2021-10-22 | 国网浙江省电力有限公司电力科学研究院 | Distributed direct current power flow controller |
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