CN110994664A - Reactive power balance system between 35kV alternating current buses based on flexible direct current technology - Google Patents
Reactive power balance system between 35kV alternating current buses based on flexible direct current technology Download PDFInfo
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- CN110994664A CN110994664A CN201911281104.3A CN201911281104A CN110994664A CN 110994664 A CN110994664 A CN 110994664A CN 201911281104 A CN201911281104 A CN 201911281104A CN 110994664 A CN110994664 A CN 110994664A
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- reactive power
- igbt
- buses
- alternating current
- direct current
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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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
- 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]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a reactive power balance system between 35kV alternating current buses based on a flexible direct current technology, which comprises a bus I section and a bus II section, wherein a control circuit is connected between each phase of the two sections of buses in series, the control circuit comprises two parallel branches, and one branch comprises a first inductor, N MMC modules and a second inductor which are sequentially connected in series. The invention optimizes the capacity allocation of the two reactive power compensation devices under the sectional and sectional operation conditions of the power distribution network and reduces the cost of system construction. Meanwhile, a multi-end flexible interconnection energy bidirectional flow control method is adopted, and the output reactive power of the reactive power compensation devices connected with the two sections of buses is allocated in real time by controlling the flexible interconnection modular multilevel circuit, so that the utilization rate of the reactive power compensation devices is improved, and the active reactive power balance among the reactive power compensation devices of the power distribution network is realized.
Description
Technical Field
The invention discloses a reactive power balance system between 35kV alternating current buses based on a flexible direct current technology, and relates to the technical field of intelligent power grids.
Background
When two sections of buses exist in a power distribution network of 35kV or below, the buses generally run in a subsection mode, and each section of bus is respectively provided with 1 set of static reactive power compensation device. The static reactive power compensation device which is configured in a sectional manner in the power distribution network can continuously adjust the reactive power output of the static reactive power compensation device in real time so as to realize the control of the voltage of the grid-connected point bus. Under the sectional operation mode of the power distribution network, two sections of buses operate independently and the connection line between the sections is disconnected, however, the two sections of buses of the power distribution network cannot work under the maximum load capacity under most conditions, and the capacity of the static reactive power compensation device in the power distribution network is configured according to the maximum load, so that the system construction cost is increased, and the reactive power compensation device is idle. The reactive power distribution of two reactive power generation devices connected with two sections of buses of the power distribution network is balanced by flexibly interconnecting the two sections of alternating current buses, so that the utilization rate of the reactive power compensation devices can be improved, the fault rate of the two sections of buses can be reduced, and the power supply reliability, dynamic reactive power support and unbalanced operation capability of a reactive power compensation system of the two sections of buses can be improved.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a reactive power balance system between 35kV alternating current buses based on a flexible direct current technology, so that the interconnection between two reactive power compensation devices respectively connected with a section bus of a power distribution network is realized, and the manufacturing cost and the running loss of the devices are reduced.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a reactive power balance system between 35kV alternating current generating line based on flexible direct current technique, includes I section of generating line and II sections of generating line, concatenates a control circuit between each looks of two sections generating lines, control circuit includes two parallelly connected branches, and one of them branch road is including the first inductance, a N MMC module and the second inductance that concatenate in proper order.
Further, the MMC module comprises a first IGBT (Sa), a second IGBT (Sb) and a capacitor CsA capacitor C is arranged between the collector electrode of the first IGBT and the emitter electrode of the second IGBT of the middle MMC modulesThe emitter of the first IGBT is connected with the collector of the second IGBT in series and is also connected with the emitter of the second IGBT of the next MMC module in series; wherein the emitter of the second IGBT of the first MMC module is connected with one end of the first inductor in series, and the connecting point of the emitter of the first IGBT of the last MMC module and the collector of the second IGBT is connected with one end of the second inductor in series.
Furthermore, the number of the N MMC modules is even.
Furthermore, the bus and the control circuit are connected through a bus switch, a mutual inductor, a protection circuit and a transformer, and two ends of the control circuit are connected between the low-voltage sides of the two transformers.
Furthermore, the low-voltage sides of the two transformers are respectively connected with a power cabinet of the static reactive power compensation device.
Furthermore, a starting cabinet is connected between the low-voltage sides of the two transformers and the power cabinet of the static reactive power compensation device.
When the reactive power provided by the I section of the bus is overlarge and the reactive power provided by the II section of the bus is very small, the reactive power can be provided for the I section of the bus from the II section of the bus in a flexible interconnection mode, so that the output reactive power of the I section of the bus connected with the reactive power compensation device is reduced, and the damage caused by the overlarge reactive power output by the I section of the bus reactive power compensation device is avoided; meanwhile, the reactive power utilization rate of the reactive power compensation device at the section II of the bus is improved.
When one reactive power compensation device connected with the sectional buses of the power distribution network fails or is overhauled to cause voltage instability or insufficient reactive power support of a grid connection point, the flexible interconnection device can provide emergency reactive power support for the sectional buses from the reactive power compensation device connected with the other sectional buses, voltage instability of the grid connection point is avoided, and the voltage stability of the power distribution network is improved.
Has the advantages that: 1. the capacity allocation of the two reactive power compensation devices under the conditions of section operation and section operation of the power distribution network is optimized, and the cost of system construction is reduced.
2. By adopting a multi-end flexible interconnection energy bidirectional flow control method, the output reactive power value of the reactive power compensation device connected with the two sections of buses is allocated in real time by controlling the flexible interconnection modular multilevel circuit, so that the utilization rate of the device is improved, and the active reactive power balance among the reactive power compensation devices of the power distribution network is realized.
3. The mode of flexibly interconnecting two sections of alternating current buses in the sectional operation of the power distribution network is adopted, so that the fault rate of the two sections of buses is reduced, the power supply reliability, the dynamic reactive support and the unbalanced operation capacity of the reactive compensation system are improved, and the risk coping capacity of the power grid is enhanced.
Drawings
FIG. 1 is a schematic diagram of a power distribution network according to the present invention;
fig. 2 is a schematic diagram of a control circuit of the present invention.
Detailed Description
The following describes the embodiments in further detail with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 2, the present embodiment provides: the utility model provides a reactive power balance system between 35kV alternating current generating line based on flexible direct current technique, includes I section of generating line and II sections of generating line, concatenates a control circuit between each looks of two sections generating lines, control circuit includes two parallelly connected branches, and one of them branch road is including the first inductance, a N MMC module and the second inductance that concatenate in proper order.
The MMC module comprises a first IGBT (Sa), a second IGBT (Sb) and a capacitor CsA capacitor C is arranged between the collector electrode of the first IGBT and the emitter electrode of the second IGBT of the middle MMC modulesThe emitter of the first IGBT is connected with the collector of the second IGBT in series and is also connected with the emitter of the second IGBT of the next MMC module in series; wherein the emitter of the second IGBT of the first MMC module is connected with one end of the first inductor in series, and the connecting point of the emitter of the first IGBT of the last MMC module and the collector of the second IGBTOne end of the second inductor is connected in series.
The quantity of N MMC modules is even number.
The bus and the control circuit are connected through a bus switch, a mutual inductor, a protection circuit and a transformer, and two ends of the control circuit are connected between the low-voltage sides of the two transformers.
The low-voltage sides of the two transformers are respectively connected with a power cabinet of the static reactive power compensation device.
And a starting cabinet is connected between the low-voltage sides of the two transformers and the power cabinet of the static reactive power compensation device.
According to the sectional running state of the power distribution network, a multi-terminal flexible-direct controller is adopted to realize the intelligent control and regulation of the reactive power output by two static reactive power compensation devices connected by sectional buses, and the intelligent control and regulation are mainly realized through the following three working modes.
The first mode is as follows: load balancing mode
Under the distribution network segmentation normal operating condition, when the reactive power that I section of generating line provided wherein is too big, and the reactive power that II sections of generating line provided is very little, can provide reactive power to I section of generating line from II sections of generating line through flexible interconnection mode, reduce I section of generating line and connect reactive power compensation device's output reactive power, avoid I section of generating line reactive power output too big the damage that causes. Meanwhile, the reactive power utilization rate of the reactive power compensation device connected with the second section of the bus is improved.
And a second mode: emergency reactive support mode
When the reactive power support can not meet the reactive power support requirement of a grid connection point due to capacity reduction of one reactive power compensation device connected with a section bus of the power distribution network, emergency reactive power support can be carried out on the section from the reactive power compensation device connected with another section bus through the flexible interconnection device, and the problem of reactive power shortage of the section bus is solved.
And a third mode: grid-connected voltage stabilization control mode
When one reactive power compensation device connected with the power distribution network sectional bus fails or is overhauled to cause grid-connected voltage instability, the reactive power support can be provided for the sectional bus from the reactive power compensation device connected with the other sectional bus through the flexible interconnection device, voltage instability of a grid-connected point is avoided, and the voltage stability of a power grid is improved.
The invention optimizes the capacity allocation of the two reactive power compensation devices under the sectional and sectional operation conditions of the power distribution network and reduces the cost of system construction.
The invention adopts a multi-end flexible interconnection energy bidirectional flow control method, and allocates the output reactive power of the reactive power compensation devices connected with two sections of buses in real time by controlling the flexible interconnection modular multilevel circuit, thereby improving the utilization rate of the devices and realizing the active reactive power balance among the reactive power compensation devices of the power distribution network.
According to the invention, the two sections of alternating current buses which are operated in a sectionalized mode of the power distribution network are flexibly interconnected, so that the fault rate of the two sections of buses is reduced, the power supply reliability, the dynamic reactive power support and the unbalanced operation capability of the reactive power compensation system are improved, and the risk coping capability of the power grid is enhanced.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. Reactive power balance system between 35kV alternating current generating line based on flexible direct current technique, its characterized in that includes I section of generating line and II sections of generating line, concatenates a control circuit between each looks of two sections generating lines, control circuit includes two parallelly connected branches, and one of them branch road is including the first inductance, a N MMC module and the second inductance that concatenate in proper order.
2. The flexible DC technology-based 35kV AC busbar reactive power balancing system according to claim 1, wherein the MMC module comprises a first IGBT, a second IGBT and a capacitor CsA capacitor C is arranged between the collector electrode of the first IGBT and the emitter electrode of the second IGBT of the middle MMC modulesConnected in series, the emitter of the first IGBT is connected with the second IGA collector electrode of the BT is connected in series with an emitter electrode of a second IGBT of the next MMC module; wherein the emitter of the second IGBT of the first MMC module is connected with one end of the first inductor in series, and the connecting point of the emitter of the first IGBT of the last MMC module and the collector of the second IGBT is connected with one end of the second inductor in series.
3. The reactive power balance system between 35kV alternating current buses based on the flexible direct current technology as claimed in claim 1, wherein the number of the N MMC modules is even.
4. The reactive power balance system between 35kV alternating current buses based on the flexible direct current technology as claimed in claim 1, wherein the buses and the control circuit are connected through bus switches, transformers, protection circuits and transformers, and two ends of the control circuit are connected between the low voltage sides of the two transformers.
5. The reactive power balance system between 35kV alternating current buses based on the flexible direct current technology as claimed in claim 4, wherein the low-voltage sides of the two transformers are respectively connected with a power cabinet of a static reactive power compensation device.
6. The reactive power balance system between 35kV alternating current buses based on the flexible direct current technology as claimed in claim 5, wherein a starting cabinet is connected between the low-voltage sides of the two transformers and the power cabinet of the static reactive power compensation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911281104.3A CN110994664A (en) | 2019-12-11 | 2019-12-11 | Reactive power balance system between 35kV alternating current buses based on flexible direct current technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911281104.3A CN110994664A (en) | 2019-12-11 | 2019-12-11 | Reactive power balance system between 35kV alternating current buses based on flexible direct current technology |
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| CN110994664A true CN110994664A (en) | 2020-04-10 |
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| CN201911281104.3A Withdrawn CN110994664A (en) | 2019-12-11 | 2019-12-11 | Reactive power balance system between 35kV alternating current buses based on flexible direct current technology |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532156A (en) * | 2013-10-31 | 2014-01-22 | 湖南大学 | STATCOM unbalance compensation control method based on modular multilevel converter |
| CN106936140A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | The reactive-load adjusting device and method coordinated based on flexible direct current and high-voltage parallel electric capacity |
| WO2018211624A1 (en) * | 2017-05-17 | 2018-11-22 | 三菱電機株式会社 | Power conversion device |
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2019
- 2019-12-11 CN CN201911281104.3A patent/CN110994664A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532156A (en) * | 2013-10-31 | 2014-01-22 | 湖南大学 | STATCOM unbalance compensation control method based on modular multilevel converter |
| CN106936140A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | The reactive-load adjusting device and method coordinated based on flexible direct current and high-voltage parallel electric capacity |
| WO2018211624A1 (en) * | 2017-05-17 | 2018-11-22 | 三菱電機株式会社 | Power conversion device |
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Application publication date: 20200410 |