CN108199422A - A kind of operational mode switching system based on both ends flexible direct current power distribution network - Google Patents
A kind of operational mode switching system based on both ends flexible direct current power distribution network Download PDFInfo
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- CN108199422A CN108199422A CN201810076872.4A CN201810076872A CN108199422A CN 108199422 A CN108199422 A CN 108199422A CN 201810076872 A CN201810076872 A CN 201810076872A CN 108199422 A CN108199422 A CN 108199422A
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- Prior art keywords
- operational mode
- power
- distribution net
- voltage source
- direct current
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Classifications
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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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
Abstract
The invention discloses a kind of operational mode switching system based on both ends flexible direct current power distribution network, including islet operation pattern, single-ended power operational mode, both end power supplying operational mode, both-end isolated execution mode, static synchronous compensator operational mode and back-to-back running pattern.The present invention has given full play to the effect of flexible direct current power distribution network, improves the stability of DC distribution network operation.
Description
Technical field
The present invention relates to power electronics field, more particularly to a kind of operation based on both ends flexible direct current power distribution network
Mode switching system.
Background technology
Conventional AC power distribution network is faced with power supply capacity deficiency, user requires constantly power quality and power supply reliability
Many severe challenges such as raising, distributed generation resource access.Flexible direct current power distribution network transmit capacity, controllability, power quality and
The levels such as power supply reliability have the performance more excellent than alternating-current system.Flexible direct current power distribution network has obtained widely
Concern and research.
But due to current various countries to the research of flexible direct current power distribution network also in experimental exploration stage, the emphasis of research
The low-voltage direct power distribution network being concentrated mainly on based on direct-current micro-grid, there is no to the flexible direct current power distribution network based on VSC
Function is further excavated, so that a set of reasonable and practical, flexible feasible method of operation switch mode is not formed, so that directly
Equipment in stream power distribution network is not fully utilized, and underestimates flexible direct current power distribution network in other words in entire electric system
The effect that can be played.
The simple combination of each power electronic equipment in flexible direct current power distribution network can not give full play to flexible direct current distribution
The function of net, it is also possible to the distributed generation resource in flexible direct current power distribution network can not be made to be fully utilized.How one is designed
Set gives full play to the effect of flexible direct current power distribution network, makes flexible straight for the method for operation switch mode of flexible direct current power distribution network
It flows power distribution network and participates in dispatching of power netwoks, the stability for enhancing operation of power networks is current problem encountered.
Invention content
Goal of the invention：The object of the present invention is to provide a kind of operational modes based on both ends flexible direct current power distribution network to switch system
System effectively improves the stability of DC distribution network operation.
Technical solution：Operational mode switching system of the present invention based on both ends flexible direct current power distribution network, including with
Under several operational modes：
Islet operation pattern：Under islet operation pattern, DC distribution net is run with AC distribution net off-the-line, islet operation
Pattern can mutually switch with single-ended power operational mode；
Single-ended power operational mode：Under single-ended power operational mode, AC system only from single voltage source converter to
DC distribution net is powered, the DC bus-bar voltage in single voltage source converter control DC distribution net, its in DC distribution net
He remains unchanged the operational mode of equipment；Single-ended power operational mode can be with islet operation pattern, both end power supplying operational mode
And static synchronous compensator operational mode mutually switches, and can also be switched by both-end isolated execution mode；
Both end power supplying operational mode：Under both end power supplying operational mode, there are two voltage source converters to straight for AC system
Power distribution network power supply is flowed, two voltage source converters are located at both ends flexible direct current power distribution network and AC network junction, one end respectively
DC bus-bar voltage in voltage source converter control DC distribution net, other end voltage source converter are controlled in DC distribution net
Power, the operational mode of other equipment remains unchanged in DC distribution net；Both end power supplying operational mode can with lean against it is unlucky
Row pattern, single-ended power operational mode and both-end isolated execution mode mutually switch, also being capable of convert to static synchroballistic
Device operational mode；
Both-end isolated execution mode：Under both-end isolated execution mode, AC system is from two voltage source converters to straight
Power distribution network power supply is flowed, dc bus disconnects in DC distribution net, each voltage source converter forms independent radial direct current
Power distribution network, two voltage source converters control the DC bus-bar voltage in respective DC distribution net, other in DC distribution net
The operational mode of equipment remains unchanged；Both-end isolated execution mode can be with both end power supplying operational mode, static synchronous compensator
Operational mode is mutually converted, and can also be converted to single-ended power operational mode or back-to-back running pattern；
Static synchronous compensator operational mode：The voltage source converter being connect in DC distribution net with AC system is independent
Static synchronous compensator operational mode is operated in, exchange side reactive power compensation is realized, without active power transfer；It is static same
Walking compensator operational mode can be mutual with both-end isolated execution mode, single-ended power operational mode and back-to-back running pattern
Switching, can also be converted by both end power supplying operational mode；
Back-to-back running pattern：Under back-to-back running pattern, all loads and distributed generation resource are equal in DC distribution net
It is stopped, both end voltage source transverter is only connected by the dc bus in DC distribution net, and both end voltage source transverter is with handing over
Streaming system is connected, the DC bus-bar voltage in one end voltage source converter control DC distribution net, other end voltage source converter
Power in device control DC distribution net；Back-to-back running mode can be with static synchronous compensator operational mode, both end power supplying
Operational mode is mutually converted, and can also be converted by both-end isolated execution mode.
Advantageous effect：The invention discloses a kind of operational mode switching system based on both ends flexible direct current power distribution network, with
The prior art is compared, and has following advantageous effect：
1) operational mode for compensating for DC distribution net switches the blank of this technical field；
2) traffic control for flexible direct current power distribution network in electric system provides theoretical foundation, gives full play to flexible direct current
The effect of power distribution network enhances the stability of operation of power networks.
Description of the drawings
Fig. 1 is the schematic diagram of both ends flexible direct current power distribution network in the specific embodiment of the invention；
Fig. 2 is that operational mode switching system based on both ends flexible direct current power distribution network is shown in the specific embodiment of the invention
It is intended to.
Specific embodiment
As shown in Figure 1, the DC distribution net in present embodiment includes the first AC system 1, the second AC system
2nd, dc bus, first voltage source transverter 3, the second voltage source transverter 4, DC/AC transverters, two-way DC/DC transverters,
DC/DC transverters, DC/DC transverters, commutator transformer, wind power generation, energy storage device, photovoltaic generation, AC load, direct current are born
Lotus, DC grid, dc circuit breaker.First voltage source transverter 3 is connected between the first AC system 1 and dc bus, the
Two voltage source converters 4 are connected between the second AC system 2 and dc bus, and electric energy can pass through first voltage source transverter 3
And the two-way flow between AC system and dc bus of the second voltage source transverter 4.DC/AC transverters are connected to wind energy hair
Between electricity, AC load and dc bus.Two-way DC/DC transverters are connected between energy storage device and dc bus.DC/DC is changed
Stream device is connected between photovoltaic generation, DC load and dc bus.Commutator transformer is connected to DC grid and dc bus
Between.The connection of wind-power electricity generation and dc bus is unidirectional, and electric energy flows to dc bus by wind-power electricity generation.Energy storage device with it is straight
The connection for flowing busbar is two-way, and electric energy can be flowed to dc bus by energy storage device, also can flow to energy storage device by dc bus.
The connection of photovoltaic generation and dc bus is unidirectional, and electric energy flows to dc bus by photovoltaic generation.Wind-power electricity generation, energy storage device
And photovoltaic generation can be collectively referred to as distributed generation resource.The connection of AC load and dc bus is unidirectional, and electric energy is by direct current mother
Line flows to AC load.The connection of DC load and dc bus is unidirectional, and electric energy flows to DC load by dc bus.Directly
The connection of galvanic electricity net and dc bus is two-way, and electric energy can be flowed to DC grid by dc bus, also can be by DC grid stream
To dc bus.Dc circuit breaker is connected to as protection equipment between all devices, and faulty equipment is disconnected in equipment fault
With the connection of DC distribution net, to prevent the expansion of fault coverage in DC distribution net.
The english abbreviation of voltage source converter is VSC.
Present embodiment discloses a kind of operational mode switching system based on both ends flexible direct current power distribution network, such as schemes
Shown in 2, including following several operational modes：
Islet operation pattern：Under islet operation pattern, DC distribution net is run with AC distribution net off-the-line, islet operation
Pattern can mutually switch with single-ended power operational mode.Under islet operation pattern, one end VSC is grid-connected, then islet operation mould
Formula is converted to single-ended power operational mode；Under single-ended power operational mode, VSC is out of service, is only powered by distributed generation resource, then
Single-ended power operational mode is converted to islet operation pattern.
Single-ended power operational mode：Under single-ended power operational mode, AC system only from single voltage source converter to
DC distribution net is powered, the DC bus-bar voltage in single voltage source converter control DC distribution net, its in DC distribution net
He remains unchanged the operational mode of equipment；Single-ended power operational mode can be with islet operation pattern, both end power supplying operational mode
And static synchronous compensator operational mode mutually switches, and can also be switched by both-end isolated execution mode.Single-ended power
During operational mode, VSC is out of service, is only powered by distributed generation resource, then single-ended power operational mode is converted to islet operation mould
Formula；2 end VSC are run simultaneously, then single-ended power operational mode is converted to both end power supplying operational mode；VSC breaks with DC distribution net
Independent operating is opened, then single-ended power operational mode convert to static synchronous compensator operational mode.During islet operation pattern, 1 end
VSC is grid-connected, then islet operation pattern is converted to single-ended power operational mode.During both-end isolated execution mode, 1 end VSC exits fortune
Row, then both-end isolated execution mode is converted to single-ended power operational mode.During static synchronous compensator operational mode, 1 end VSC to
DC distribution net is powered, then static synchronous compensator operational mode is converted to single-ended power operational mode.During both-end operational mode,
1 end VSC is out of service, then both end power supplying operational mode is converted to single-ended power operational mode.
Both end power supplying operational mode：Under both end power supplying operational mode, there are two voltage source converters to straight for AC system
Power distribution network power supply is flowed, a voltage source converter controls the DC bus-bar voltage in DC distribution net, another voltage source converter
Power in device control DC distribution net, the operational mode of other equipment remains unchanged in DC distribution net；Both end power supplying is run
Pattern can mutually switch with back-to-back running pattern, single-ended power operational mode and both-end isolated execution mode, also can
Convert to static synchronous compensator operational mode.During both end power supplying operational mode, 1 end VSC is out of service, then both end power supplying is run
Pattern is converted to single-ended power operational mode；Circuit disconnects between both-end VSC, then both end power supplying operational mode is converted to both-end isolation
Operational mode；Both-end VSC is disconnected with DC distribution net and independent operating, then both end power supplying operational mode convert to static, which synchronizes, mends
Repay device operational mode；All loads and distributed generation resource in DC distribution net are disconnected, then both end power supplying operational mode is converted to the back of the body
Back-to-back running pattern.During single-ended power operational mode, 2 end VSC are run simultaneously, then single-ended power operational mode is converted to both-end confession
Electricity operation pattern.During both-end isolated execution mode, open-circuit line resumes operation, then both-end isolated execution mode is converted to both-end confession
Electricity operation pattern.During back-to-back running pattern, load and distributed generation resource in DC distribution net are accessed, then back-to-back running mould
Formula is converted to both end power supplying operational mode.
Both-end isolated execution mode：Under both-end isolated execution mode, AC system is from two voltage source converters to straight
Power distribution network power supply is flowed, dc bus disconnects in DC distribution net, each voltage source converter forms independent radial direct current
Power distribution network, two voltage source converters control the DC bus-bar voltage in respective DC distribution net, other in DC distribution net
The operational mode of equipment remains unchanged；Both-end isolated execution mode can be with both end power supplying operational mode, static synchronous compensator
Operational mode is mutually converted, and can also be converted to single-ended power operational mode or back-to-back running pattern.Both-end isolation operation
During pattern, 1 end VSC is out of service, then both-end isolated execution mode is converted to single-ended power operational mode；Open-circuit line restores fortune
Row, then both-end isolated execution mode is converted to both end power supplying operational mode；VSC disconnects independent operating with DC distribution net, then double
Hold isolated execution mode convert to static synchronous compensator operational mode；Only connected between both-end VSC by dc bus, then both-end every
Back-to-back running pattern is converted to from operational mode.During both end power supplying operational mode, circuit disconnects between both-end VSC, then both-end supplies
Electricity operation pattern is converted to both-end isolated execution mode.During static synchronous compensator operational mode, both-end VSC is straight after disconnection
Stream power distribution network is powered respectively, then static synchronous compensator operational mode is converted to both-end isolated execution mode.
Static synchronous compensator operational mode：The voltage source converter being connect in DC distribution net with AC system is independent
Static synchronous compensator operational mode is operated in, exchange side reactive power compensation is realized, without active power transfer；It is static same
Walking compensator operational mode can be mutual with both-end isolated execution mode, single-ended power operational mode and back-to-back running pattern
Switching, can also be converted by both end power supplying operational mode.During static synchronous compensator operational mode, 1 end VSC matches to direct current
Power grid is powered, then static synchronous compensator operational mode is converted to single-ended power operational mode；Direct currents of the both-end VSC after disconnection
Power distribution network is powered respectively, then static synchronous compensator operational mode is converted to both-end isolated execution mode；Dc bus closes a floodgate, then
Static synchronous compensator operational mode is converted to back-to-back running pattern.During both end power supplying operational mode, both-end VSC matches with direct current
Power grid disconnects and independent operating, then both end power supplying operational mode convert to static synchronous compensator operational mode.Single-ended power is transported
During row pattern, VSC disconnects independent operating with DC distribution net, then single-ended power operational mode convert to static synchronous compensator is transported
Row pattern.During both-end isolated execution mode, VSC disconnects independent operating with DC distribution net, then both-end isolated execution mode is converted
For static synchronous compensator operational mode.During back-to-back running pattern, dc bus disconnects, then back-to-back running pattern is converted to
Static synchronous compensator operational mode.
Back-to-back running pattern：Under back-to-back running pattern, all loads and distributed generation resource are equal in DC distribution net
It is stopped, two voltage source converters are only connected by the dc bus in DC distribution net, and two voltage source converters are with handing over
Streaming system is connected, the DC bus-bar voltage in a voltage source converter control DC distribution net, another voltage source converter
Power in device control DC distribution net；Back-to-back running pattern can be with static synchronous compensator operational mode, both end power supplying
Operational mode is mutually converted, and can also be converted by both-end isolated execution mode.During back-to-back running pattern, access direct current is matched
Load and distributed generation resource in power grid, then back-to-back running pattern be converted to both end power supplying operational mode；Dc bus disconnects,
Then back-to-back running pattern convert to static synchronous compensator operational mode.During both-end isolated execution mode, between both-end VSC only by
Dc bus connects, then both-end isolated execution mode is converted to back-to-back running pattern.During static synchronous compensator operational mode,
Dc bus closes a floodgate, then static synchronous compensator operational mode is converted to back-to-back running pattern.During both end power supplying operational mode,
All loads and distributed generation resource in DC distribution net are disconnected, then both end power supplying operational mode is converted to back-to-back running pattern.
Claims (1)
1. a kind of operational mode switching system based on both ends flexible direct current power distribution network, it is characterised in that：Including following several fortune
Row pattern：
Islet operation pattern：Under islet operation pattern, DC distribution net is run with AC distribution net off-the-line, islet operation pattern
Can mutually it switch with single-ended power operational mode；
Single-ended power operational mode：Under single-ended power operational mode, AC system is only from single voltage source converter to direct current
Power distribution network is powered, the DC bus-bar voltage in single voltage source converter control DC distribution net, other in DC distribution net are set
Standby operational mode remains unchanged；Single-ended power operational mode can with islet operation pattern, both end power supplying operational mode and
Static synchronous compensator operational mode mutually switches, and can also be switched by both-end isolated execution mode；
Both end power supplying operational mode：Under both end power supplying operational mode, AC system is matched there are two voltage source converter to direct current
Power grid is powered, and two voltage source converters are located at both ends flexible direct current power distribution network and AC network junction, a terminal voltage respectively
DC bus-bar voltage in the converter Control DC distribution net of source, other end voltage source converter control the work(in DC distribution net
Rate, the operational mode of other equipment remains unchanged in DC distribution net；Both end power supplying operational mode can be with back-to-back running mould
Formula, single-ended power operational mode and both-end isolated execution mode mutually switch, also being capable of convert to static synchronous compensator fortune
Row pattern；
Both-end isolated execution mode：Under both-end isolated execution mode, AC system is matched from two voltage source converters to direct current
Power grid is powered, and dc bus disconnects in DC distribution net, each voltage source converter forms independent radial DC distribution
Net, two voltage source converters control the DC bus-bar voltage in respective DC distribution net, other equipment in DC distribution net
Operational mode remain unchanged；Both-end isolated execution mode can be run with both end power supplying operational mode, static synchronous compensator
Pattern is mutually converted, and can also be converted to single-ended power operational mode or back-to-back running pattern；
Static synchronous compensator operational mode：The equal independent operating of voltage source converter being connect in DC distribution net with AC system
In static synchronous compensator operational mode, exchange side reactive power compensation is realized, without active power transfer；Static Synchronous is mended
Repaying device operational mode can mutually cut with both-end isolated execution mode, single-ended power operational mode and back-to-back running pattern
It changes, can also be converted by both end power supplying operational mode；
Back-to-back running pattern：Under back-to-back running pattern, all loads and distributed generation resource stop in DC distribution net
Work, both end voltage source transverter are only connected by the dc bus in DC distribution net, and both end voltage source transverter is with exchanging system
System is connected, the DC bus-bar voltage in one end voltage source converter control DC distribution net, other end voltage source converter control
Power in DC distribution net processed；Back-to-back running mode can be run with static synchronous compensator operational mode, both end power supplying
Pattern is mutually converted, and can also be converted by both-end isolated execution mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810076872.4A CN108199422A (en) | 2018-01-26 | 2018-01-26 | A kind of operational mode switching system based on both ends flexible direct current power distribution network |
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| CN201810076872.4A CN108199422A (en) | 2018-01-26 | 2018-01-26 | A kind of operational mode switching system based on both ends flexible direct current power distribution network |
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| CN108199422A true CN108199422A (en) | 2018-06-22 |
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| CN201810076872.4A Pending CN108199422A (en) | 2018-01-26 | 2018-01-26 | A kind of operational mode switching system based on both ends flexible direct current power distribution network |
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| CN109217337A (en) * | 2018-10-16 | 2019-01-15 | 华南理工大学 | A kind of isolated island detection of four ends DC distribution net and stable control method |
| CN109936139A (en) * | 2019-04-30 | 2019-06-25 | 国网内蒙古东部电力有限公司 | A kind of power distribution network both-end flexible interconnection distribution system and its distribution method |
| CN110556813A (en) * | 2019-08-23 | 2019-12-10 | 广东电网有限责任公司珠海供电局 | high-reliability operation mode switching method for direct-current power distribution system |
| CN113315108A (en) * | 2021-06-04 | 2021-08-27 | 国网江苏省电力有限公司电力科学研究院 | Method and system for dividing and uniformly managing operation modes of direct-current power distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109217337A (en) * | 2018-10-16 | 2019-01-15 | 华南理工大学 | A kind of isolated island detection of four ends DC distribution net and stable control method |
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| CN113315108A (en) * | 2021-06-04 | 2021-08-27 | 国网江苏省电力有限公司电力科学研究院 | Method and system for dividing and uniformly managing operation modes of direct-current power distribution network |
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