CN104934972B - Power Exchange node and medium voltage distribution network active power flowcontrol power network and control method - Google Patents
Power Exchange node and medium voltage distribution network active power flowcontrol power network and control method Download PDFInfo
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Abstract
The invention discloses a kind of Power Exchange node and medium voltage distribution network active power flowcontrol power network and control method.Power Exchange node is configured in power distribution network, Power Exchange node links up the medium-voltage distribution circuit of two and the above, and realizes that the active and reactive power flow of the medium-voltage distribution circuit to being connected carries out the control of active by the AC/DC current transformers in Power Exchange node；The Power Exchange node includes two or more medium-voltage distribution circuit service entrance switch, the two or more distribution step-down transformers corresponding with service entrance switch, the two or more AC/DC current transformers corresponding with distribution step-down transformer, a dc bus, a node state monitoring system.Power Exchange node proposed by the invention is capable of the effective power flow and reactive power flow of continuously smooth each bar connection line of control, it is to avoid frequently cut-offfing for switch, increases utilization rate of equipment and installations, and extension device service life improves power supply reliability.
Description
Technical field
The present invention relates to medium voltage distribution network optimization operation field, distribution " Power Exchange is specifically introduced in medium voltage distribution network
Node ", centering press-fitting electric network swim carries out active control.
Technical background
Medium-voltage distribution in power system connects power consumer under holding power transmission network on the net, and distribution electricity is undertaken in electric power networks
The important function of energy.Compared with other electric power networks, MV distribution systems most outstanding feature be as the end of power network, can
The change of acumen reaction electric load.In the conveying and assigning process of electric energy, transformer, circuit element in medium voltage distribution network
Certain electric energy will be consumed, wherein the network loss that current China's coverage rate highest is 10kV circuits more account for whole grid net loss
Sizeable proportion, according to statistics up to more than 60%.The load variations of medium voltage distribution network are frequently and violent, often there is part circuit
The situation of underloading, part circuit overload, the long-term overlond running of circuit can greatly increase line loss per unit, accelerate the old of circuit and equipment
Change, or even trigger power failure.
With becoming increasingly conspicuous for environmental problem and overcoming for battery technology barrier, common people's acceptance of electric automobile is increasingly
Height, takes the lead formulation by Ministry of Industry and Information《Energy-conservation and new-energy automobile industrial development planning（2011-2020）》Middle proposition, arrives
The year two thousand twenty, China's electric automobile recoverable amount should reach 5,000,000.Following electric automobile will increase along battery capacity, continuation of the journey
Ability strengthens, and the trend of adequate and systematic service gradual perfection is continued to develop.In the electric automobile charging and conversion electric that on January 16th, 2014 holds
Facility standards system is improved in seminar, and national grid is released " leading to fill soon, take into account trickle charge, guiding and change electric, economical and practical "
Construction principle.Demand is filled soon in order to meet batteries of electric automobile, and battery charge power can be increasing, as electric automobile oozes
The raising of saturating rate, following electric automobile as power distribution network heavy load, its charging interval, place randomness can be to the peace of distribution
Full economical operation brings very big challenge, has a strong impact on the economical operation of power network, and distribution confession can be even deteriorated in extreme circumstances
Electric reliability.
In recent years, the Chinese government has put into effect various policies actively to support also using parallel network power generation project as emphasis
Grid-connected project.The end of the year 2012, in second batchs in 2012 " golden sun demonstration project " project directory that the Department of Science and Technology announces
In, projects installation total capacity reaches 2.83GW.Large centralised photovoltaic plant takes up an area problem due to investment and city, should not be in city
Promoted in city's power distribution network, thus distributed photovoltaic power generation is always the focus of Recent study.On December 19th, 2012 calls together
The Executive Meeting of the State Council opened proposes, puts forth effort to advance distributed photovoltaic power generation, encourages the installation of unit, community and family, uses light
Photovoltaic generating system.But after photovoltaic power generation grid-connecting, due to its generating Some features of itself, by the trend of power distribution network, voltage,
Protection, the quality of power supply, planning and designing and reliability etc. bring many uncertain factors and problem.
By the exploration and practice in more than ten years, the Distribution Automation Technology of China is reached its maturity, and the communication technology is also obtained
Revolutionary progress, has been able to realize that accurate fault location and interactive or full-automatic Fault Isolation and healthy sections are quick
Restore electricity, but also with certain fault-tolerance.But the level of power distribution automation still improves rank in troubleshooting at present
Section, is further improving regional imbalance load transfer, Region homogenization distribution, the raising of power distribution network safety and economic operation with netting twine
The aspect problem such as road resource utilization is to be resolved.City supply and distribution network is frequently with power supply reliability ring network knot high
Structure, each circuit fanout operation, once breaking down, is then restored electricity rapidly by grid switching operation in normal conditions, therefore line
Power on road generally has unidirectional flow.When certain circuit overload in distribution, if by directly close row swithes by
Two or more pieces circuit shares the burden lotus, because trend is influenceed effectively to control by electrical network parameter under free paired running, and
The circuit of different voltage class is formed electromagnetic looped network by transformer, cause trend complex distribution, relaying configuration it is difficult,
The problems such as short circuit current increases, therefore the method not use in actual motion.Additionally, cable run ratio increases in power distribution network
Greatly, capacitive reactive power can be conveyed to transformer station during part circuit underloading, but most cities 110kV, 220kV transformer station does not have substantially
There is configuration reactor, even threaten electric power to set so as to easily cause urban power distribution network overtension in underloading, under extreme case
Standby safe and stable operation.
The measure for solving medium voltage distribution network above mentioned problem at present is mainly the pressure in the prediction of planning stage exact load is strengthened
Distribution line construction, increase compensation device, Optimized Operation and real-time network reconstruct etc. technical measures come tackle load growth,
Line loss is big, the low problem of terminal voltage.Such as：Patent application 201410630097.4（It is a kind of grid-connected containing distributed photovoltaic
Active distribution network planing method）, patent application 201410662732.7（A kind of active distribution network distributes structure and its configuration rationally
Method）, patent application 201310755765.1（Power distribution network active reconstruction strategy and its prevention and control method）, patent application
201410643725.2（A kind of multi-target networks reconstructing method suitable for active distribution network）Deng.Abovementioned technology has one
Series of problems, such as：The flexibility that investment is big, the construction period is long, can not increase substantially distribution reliability, lack power flow regulating.
The content of the invention
It is contemplated that overcoming the shortcomings of above-mentioned background technology, there is provided a kind of Power Exchange node and medium voltage distribution network are actively
Power flowcontrol power network and control method.
A kind of medium voltage distribution network active flow control method based on Power Exchange node, configures power friendship in power distribution network
Node is changed, Power Exchange node links up the medium-voltage distribution circuit of two and the above, and by Power Exchange node
AC/DC current transformers realize that the active and reactive power flow of the medium-voltage distribution circuit to being connected carries out the control of active；The power
Switching node includes two or more medium-voltage distribution circuit service entrance switch, the two or more distribution drops corresponding with service entrance switch
Pressure transformer, the two or more AC/DC current transformers corresponding with distribution step-down transformer, a dc bus, a node
Condition monitoring system.
Medium pressure distribution line, is that bus is pressed in same or difference from same higher level transformer station, or come
From the middle pressure bus of different higher level transformer stations；The primary voltage of described medium-voltage distribution circuit allows to exist because of higher level power transformation station owner
The big phase difference of cause more than 30 ° of transformer connection group, or cause by the active power difference on distribution line it is small
Phase difference.
Described medium-voltage distribution circuit service entrance switch enter line side and corresponding medium-voltage distribution circuit connection；Described middle pressure
The high-pressure side connection of the outgoing line side of distribution line service entrance switch and corresponding step-down transformer；Described distribution step-down transformer
The AC connection of low-pressure side and corresponding AC/DC current transformers；The low-pressure side connection low pressure of described distribution step-down transformer is handed over
Current load, or without low-voltage alternating-current load；The DC side of all described AC/DC current transformers and the connection of same dc bus；
Described dc bus connection DC load or dc source, or without any direct current current load or dc source；The node
The flow situations of each circuit in Power Exchange node described in condition monitoring system monitor in real time, with distribution scheduling center two-way
Letter, the operation of the Power Exchange node is controlled by sending node status information, acquisition dispatch command.
Described AC/DC current transformers include the main circuit of electronic power switch device composition and corresponding control protection electricity
Road, the topology of the main circuit is the level current transformer of three-phase two, how electric diode-clamped Multilevel Inverters, striding capacitance type be
Flat current transformer or MMC type transverter；The topology of the main circuit is a 3-phase power converter or multiple 3-phase power converters and connects group
Into；The main circuit both can be using full control power electronic devices (such as IGBT, GTO, IGCT etc.), it would however also be possible to employ half control electric power
Electronic switching device.
Each described AC/DC transverter has its corresponding controller, and total control strategy is：One of AC/DC
Current transformer controls the reactive power and DC bus-bar voltage of its respective lines, referred to as (Q, U dc ) current transformer；Remaining AC/DC unsteady flow
Device controls the effective power flow and reactive power flow of its respective lines according to dispatch command, referred to as (P,Q) current transformer.
Described AC/DC current transformers are operated in STATCOM patterns, according to power distribution network dispatch command to distribution line convey or
Absorbing reactive power, solves the problems, such as that the distribution network voltage caused by circuit underloading or heavy duty is too high or too low.
The dc bus and can connect one and above DC load, including but not limited to electric vehicle rapid charging machine；
1 and above dc source, including but not limited to energy storage battery, photovoltaic power generation apparatus and can be connect；The dc source is provided
Electric energy the DC load directly fed by public dc bus consume, or after the AC/DC current transformers are changed
Feeding AC power distribution line.
Described node state monitoring system：1）Realize to AC/DC transverters, the downconverter in Power Exchange node
Device, the state of lead-in circuit breaker carry out real-time monitoring；Load, power supply to Power Exchange intra-node are exerted oneself and adopted in real time
Collection；2）EMS or SCADA system with distribution scheduling center carry out information exchange；3）According to the trend that distribution scheduling center issues
The load of the Power Exchange intra-node for instructing and detecting, power supply are exerted oneself by after calculating, send corresponding regulating command to
The controller of each AC/DC transverter.Described controller can be an independent computer system, it is also possible to be changed by each
The controller of device is flowed to realize.
A kind of Power Exchange node, including two or more medium-voltage distribution circuit service entrance switch, two or more and inlet wire
The corresponding distribution step-down transformer of switch, the two or more AC/DC current transformers corresponding with distribution step-down transformer, one
Dc bus, a node state monitoring system；Described medium-voltage distribution circuit service entrance switch enters line side and corresponding middle pressure
Distribution line is connected；The outgoing line side of described medium-voltage distribution circuit service entrance switch and the high-pressure side of corresponding step-down transformer connect
Connect；The AC connection of the low-pressure side of described distribution step-down transformer and corresponding AC/DC current transformers；Described distribution step-down
The low-pressure side connection low-voltage alternating-current load of transformer, or without low-voltage alternating-current load；The direct current of all described AC/DC current transformers
Side and same dc bus are connected；Described dc bus connection DC load or dc source, or without any direct current stream
Load or dc source；The trend feelings of each circuit in Power Exchange node described in the node state monitoring system monitor in real time
Condition, with the two-way communication of distribution scheduling center, the Power Exchange is controlled by sending node status information, acquisition dispatch command
The operation of node.
A kind of medium voltage distribution network active power flowcontrol power network based on described Power Exchange node.
The beneficial effects of the present invention are：1) Power Exchange node proposed by the invention being capable of continuously smooth each bar of control
The effective power flow and reactive power flow of connection line, it is to avoid frequently cut-offfing for switch, increase utilization rate of equipment and installations, and extension device uses the longevity
Life, improves power supply reliability.2) it is capable of the load of balanced each bar connection line, the part load on heavy-haul line is transferred to
On light-loaded circuit, the utilization rate of distribution network line resource can be improved, the drop for reducing distribution network is damaged.3) Power Exchange node
DC load or dc source and can be connect at dc bus, the electric energy that dc source sends directly can be disappeared by DC load
Consumption, it is to avoid energy loss of the electric energy during power line transmission, improves the utilization ratio of energy.4) photovoltaic generation is worked as
When the dc sources such as array are incorporated to dc bus, electricity can be transported to power distribution system by a plurality of medium-voltage distribution circuit
In system, the submitting capability problemses of the regenerative resources such as larger capacity distributed photovoltaic are solved, transported for power distribution network safety economy
Row tool is of great significance.5) the AC/DC transverters in Power Exchange node can shift to STATCOM operational modes, root
Think distribution line conveying or absorbing reactive power according to power distribution network dispatch command, solve because of the power distribution network that circuit underloading or heavy duty cause
Overtension or too low problem.
Brief description of the drawings
Fig. 1 is the MV distribution systems partial schematic diagram containing Power Exchange node；
Fig. 2 is the internal structure schematic diagram of Power Exchange node；
Fig. 3 is the electrical block diagram of AC/DC transverters.
Specific embodiment
Below in conjunction with Figure of description, the invention will be further described.
Operation principle of the invention is：Two or a plurality of medium-voltage distribution circuit are passed through inlet wire by the Power Exchange node
The elements such as switch, step-down transformer, AC/DC transverters, dc bus are linked up, and are changed by AC/DC in Power Exchange node
Coordination control between stream device, adjusts active, the reactive power flow of each circuit, realizes the active to each bar medium-voltage distribution circuit trend
Control.Monitoring system in the Power Exchange node receives the instruction of control centre, each bar of reasonable adjusting by high-speed traffic
The trend of medium-voltage distribution circuit.Dc bus in the Power Exchange node can connect large-sized DC load, in reply electricity
During the large-scale emerging load such as electrical automobile charging quick charge station, large-scale data center, a plurality of medium-voltage distribution circuit can be used
Power supply mode and realize each bar line load equilibrium assignment simultaneously.In reply larger capacity（1-10MW）Distributed photovoltaic electricity
When the electric energy stood is exported and dissolved, a Power Exchange node can be configured in power station location and pass through issued light volt electric energy
In the medium-voltage distribution circuit that dc bus in Power Exchange node is delivered directly to and the Power Exchange node is connected, by these
Load on circuit is directly dissolved.Several Power Exchange nodes are configured in medium voltage distribution network, is dispatched by power distribution network
Control is planned as a whole in center to all of Power Exchange node in network, sends scheduling to the monitoring system of each Power Exchange node and refers to
Order, realizes the optimization operation of the overall multiple target of medium voltage distribution network.
As shown in figure 1, configuring several Power Exchange nodes in medium pressure power distribution network." the Power Exchange node "
Two in medium voltage distribution network or a plurality of medium-voltage distribution circuit are coupled together.Medium pressure distribution line, is from same
Bus, or the middle pressure bus from different higher level transformer stations are pressed in the same or difference of higher level transformer station；Described middle pressure
The primary voltage of distribution line allows the big phase in the presence of more than 30 ° caused by higher level's main transformer of transformer substation wiring group
Difference, or the small phase difference caused by the active power difference on distribution line.The voltage class of described medium-voltage distribution circuit
It is 10-50kV.
As shown in Fig. 2 in described " Power Exchange node "：Medium-voltage distribution circuit service entrance switch enters line side and correspondence
Medium-voltage distribution circuit connection, the outgoing line side of medium pressure distribution line service entrance switch and the high-pressure side of corresponding step-down transformer
Connection.The AC connection of the low-pressure side of described step-down transformer and corresponding AC/DC current transformers；Described step-down transformer
Low-pressure side can connect low-voltage alternating-current load, it is also possible to without low-voltage alternating-current load.Described all AC/DC current transformers it is straight
Stream side and the connection of same dc bus.Described dc bus can connect DC load or dc source, it is also possible to not have
Any direct current current load or dc source.Each described AC/DC transverter has its corresponding controller, total control strategy
It is：One of AC/DC current transformers control the reactive power and DC bus-bar voltage of its respective lines, referred to as (Q, U dc ) unsteady flow
Device；Remaining AC/DC current transformer controls the effective power flow and reactive power flow of its respective lines according to dispatch command, referred to as (P,Q) become
Stream device.The node state monitoring system and can be matched somebody with somebody with the flow situations of each circuit in Power Exchange node described in monitor in real time
Net control centre's two-way communication, the Power Exchange node is controlled by sending node status information, acquisition dispatch command
Operation." Power Exchange node " all of in network is planned as a whole by power distribution network control centre control, to each Power Exchange node
Monitoring system send dispatch command, realize medium voltage distribution network overall multiple target optimization operation.
As shown in figure 3, the filtered network of AC of the AC/DC transverters is connected with ac bus, AC/DC transverters
DC side be connected with the dc bus.Described AC/DC current transformers include the main circuit of electronic power switch device composition
With corresponding control protection electric circuit, the topology of the main circuit is the level current transformer of three-phase two, many level changes of diode-clamped
Stream device, striding capacitance type Multilevel Inverters or MMC type transverter；The topology of the main circuit is a 3-phase power converter or many
Individual 3-phase power converter simultaneously connects composition；The main circuit uses full control power electronic devices (such as IGBT, GTO, IGCT etc.), and/or
Half control electronic power switch device.The control protection electric circuit of power electronic devices is included to the electric major loop of AC/DC converters
Signal sample circuit that the signals such as voltage, electric current and temperature are sampled, receive and process sampled signal and realize control algolithm
AC/DC digitial controllers, receive AC/DC digitial controllers instruction and produce drive signal, realize defencive function.
Claims (1)
1. a kind of medium voltage distribution network active flow control method based on Power Exchange node, it is characterised in that：In power distribution network
Configuration Power Exchange node, Power Exchange node links up the medium-voltage distribution circuit of two and the above, and is handed over by power
The AC/DC current transformers changed in node realize that the active and reactive power flow of the medium-voltage distribution circuit to being connected carries out the control of active
System；The Power Exchange node includes two or more medium-voltage distribution circuit service entrance switch, two or more and service entrance switch phase
Corresponding distribution step-down transformer, the two or more AC/DC current transformers corresponding with distribution step-down transformer, a direct current mother
Line, a node state monitoring system；
Medium pressure distribution line, is to press bus in same or difference from same higher level transformer station, or from not
With the middle pressure bus of higher level transformer station；The primary voltage of described medium-voltage distribution circuit allows to exist because of higher level's transforming plant main transformer pressure
The big phase difference of cause more than 30 ° of device wiring group, or the small phase caused by the active power difference on distribution line
Difference；
Described medium-voltage distribution circuit service entrance switch enter line side and corresponding medium-voltage distribution circuit connection；Described medium-voltage distribution
The high-pressure side connection of the outgoing line side of circuit service entrance switch and corresponding step-down transformer；The low pressure of described distribution step-down transformer
The AC connection of side and corresponding AC/DC current transformers；The low-pressure side connection low-voltage alternating-current of described distribution step-down transformer is born
Carry, or without low-voltage alternating-current load；The DC side of all described AC/DC current transformers and the connection of same dc bus；It is described
Dc bus connection DC load or dc source, or without any DC load or dc source；The node state prison
The flow situations of each circuit in Power Exchange node described in control system monitor in real time, with the two-way communication of distribution scheduling center, pass through
Sending node status information, obtain dispatch command to control the operation of the Power Exchange node；
Described AC/DC current transformers include the main circuit and corresponding control protection electric circuit of electronic power switch device composition, institute
The topology of main circuit is stated for the level current transformer of three-phase two, diode-clamped Multilevel Inverters, many level of striding capacitance type become
Stream device or MMC type transverter；The topology of the main circuit is a 3-phase power converter or multiple 3-phase power converters and connects composition；Institute
Main circuit is stated using full control power electronic devices, and/or half control electronic power switch device；
Each described AC/DC current transformer has its corresponding controller, and total control strategy is：One of AC/DC unsteady flows
Device controls the reactive power and DC bus-bar voltage of its respective lines, referred to as (Q, U dc ) current transformer；Remaining AC/DC current transformer root
The effective power flow and reactive power flow of its respective lines are controlled according to dispatch command, referred to as (P,Q) current transformer；
Described AC/DC current transformers are operated in STATCOM patterns, convey or absorb to distribution line according to power distribution network dispatch command
Reactive power, solves the problems, such as that the distribution network voltage caused by circuit underloading or heavy duty is too high or too low；
The dc bus and can connect one and above DC load, including but not limited to electric vehicle rapid charging machine；Can be simultaneously
Connect 1 and above dc source, including but not limited to energy storage battery, photovoltaic power generation apparatus；The electricity that the dc source is provided
The DC load can be directly fed by public dc bus to consume, or sent into after the AC/DC current transformers are changed
AC power distribution line；
Described node state monitoring system：1）Realize to the AC/DC current transformers in Power Exchange node, step-down transformer, enter
The state of line breaker carries out real-time monitoring；Load, power supply to Power Exchange intra-node are exerted oneself and carry out Real-time Collection；2）With
The EMS or SCADA system at distribution scheduling center carry out information exchange；3）According to trend instruction and inspection that distribution scheduling center issues
The load of the Power Exchange intra-node for measuring, power supply to be exerted oneself and give each AC/DC by after calculating, sending corresponding regulating command
The controller of current transformer.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110383201B (en) * | 2015-11-09 | 2022-01-18 | 日立能源瑞士股份公司 | Power equipment controller and power distribution system |
| CN106160142B (en) * | 2016-06-30 | 2019-11-12 | 国家电网公司 | A kind of electric car low pressure charging network system of load balancing |
| CN106961107A (en) * | 2017-03-23 | 2017-07-18 | 国网湖北省电力公司十堰供电公司 | Transformer networking control method and device |
| CN107887921A (en) * | 2017-11-16 | 2018-04-06 | 江苏兴云新能源有限公司 | A kind of intelligent charging spot sharing of load and energy storage power energy allocation cloud system |
| US11121543B2 (en) | 2018-12-31 | 2021-09-14 | Abb Schweiz Ag | Fault mitigation in medium voltage distribution networks |
| US10971934B2 (en) | 2018-12-31 | 2021-04-06 | Abb Schweiz Ag | Distribution networks with flexible direct current interconnection system |
| CN109842162B (en) * | 2019-01-24 | 2022-08-16 | 国电南瑞科技股份有限公司 | Flexible AC/DC power distribution station and scheduling control strategy thereof |
| US11031773B2 (en) | 2019-03-27 | 2021-06-08 | Abb Power Grids Switzerland Ag | Transformer isolation response using direct current link |
| US10819112B1 (en) | 2019-03-27 | 2020-10-27 | Abb Schweiz Ag | Feeder line fault response using direct current interconnection system |
| CN109831023B (en) * | 2019-04-04 | 2021-06-25 | 国网江苏省电力有限公司电力科学研究院 | Black start secondary equipment power supply device for medium-voltage direct-current power distribution network |
| CN110445156B (en) * | 2019-08-22 | 2021-01-01 | 浙江大学 | Method for calculating load flow of three-phase unbalanced medium-low voltage active power distribution network with looped network |
| CN111682547B (en) * | 2020-07-06 | 2021-11-05 | 梁家诚 | 10kV active power distribution network based on power flow control nodes and control method thereof |
| WO2022028720A1 (en) * | 2020-08-07 | 2022-02-10 | Hitachi Energy Switzerland Ag | Power distribution arrangement |
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| CN103795059A (en) * | 2014-02-24 | 2014-05-14 | 国家电网公司 | Distributed photovoltaic power generation integrated control system |
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