CN207166135U - A kind of remote distributed DC power-supply system - Google Patents
A kind of remote distributed DC power-supply system Download PDFInfo
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- CN207166135U CN207166135U CN201721131512.7U CN201721131512U CN207166135U CN 207166135 U CN207166135 U CN 207166135U CN 201721131512 U CN201721131512 U CN 201721131512U CN 207166135 U CN207166135 U CN 207166135U
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Abstract
A kind of remote distributed DC power-supply system, including cable for dc bus, multiple distributed power generation modules for setting on the cables and distributed loading module, it is grid-connected to realize in the two-way inverter that described dc bus one end is set；The distributed power generation module is current mode power supply.The system also includes being used for the control loop for carrying out closed loop regulation between the distributed power generation module, distributed loading module and two-way inverter.The utility model along pipeline equipment for disperseing, spacing is farther out, it is difficult for the technical problem that distributed small-sized electricity consumption facility provides electric power steady in a long-term, devise a remote distributed DC power-supply system applied in direct current network, the voltage and current of longer dc bus is accurately controlled, reach stable operation of power networks effect.
Description
Technical field
A kind of remote distributed DC power-supply system is the utility model is related to, belongs to the technology of remote distributed direct current supply
Field.
Background technology
The facilities such as the billboards of highway both sides, monitoring, base station need power supply steady in a long-term, disperse along pipeline equipment,
Away from farther out, the electricity needs of every equipment is again smaller, if often cost is higher by General Electric Network design.Therefore remote distributed is straight
Stream electric power system can preferably play its feature on a highway, be provided steadily in the long term for distributed small-sized electricity consumption facility
Electric power.The remote distributed DC power-supply system except with electrical nodes, also comprising substantial amounts of renewable energy power generation node and
Energy storage node, such as photovoltaic, wind-powered electricity generation.Need accurately to control up to the voltage and current of 10~20 kilometers of dc bus,
The operation of power networks effect that can be stablized.
Chinese patent literature CN106981866A discloses a kind of distributed DC electric power system, belongs to power network power supply technique
Field；System includes：Power supply unit is connected to an one-level dc bus, and is respectively connected to the power supply source of outside；Power supply unit connects
One-level dc bus is connected to, and is respectively connecting to a two level dc bus；One first monitoring is set respectively in each power supply unit
Module, the first monitoring module are connected to a controlling bus；One second monitoring module, the second prison are set respectively in each power supply unit
Control module is connected to controlling bus.Compared to the patent document, the utility model only needs a dc bus, and each module is being controlled
Power supply unit or power supply unit need not be distinguished when processed, control is uniformly coordinated by master controller.
Chinese patent literature CN103036260A discloses the direct current supply system of a kind of renewable sources of energy and the mutual redundant of civil power
System, it is converted to direct current power output using generating set of renewable energy resource and gives Voltage stabilizing module, and Voltage stabilizing module is transmitted with rated voltage
A civil power redundant direct current transducer is connected to battery pack, and battery pack, by the civil power redundant direct current transducer with predetermined power
Supply battery pack；Battery pack includes a control of Electric potentials module and a power switching modules, selects to supply by the power switching modules
Power mode gives battery pack, and is exported by battery pack and supplied the DC load being connected electrically；Thereby to form mutual redundant simultaneously
Reach its stabilization of raising and efficient DC power-supply system.The patent document is distributed AC servo system without battery pack voltage stabilizing,
And it is not only a control of Electric potentials module and a power switching modules.
A kind of uninterrupted direct current (DC) power supply systems of on-load control of Chinese patent literature CN203536997U, its feature exist
In：Including DC power supply device and direct current output Power entry module, DC power supply device is built with batteries and on-site supervision system
System, if load and intelligent switch of the direct current output Power entry module built with main line independence, batteries pass through direct current output bus
If the load with main line independence is connected, an intelligent switch, scene prison are also connected between each load and direct current output bus
Control system is connected with batteries and monitors accumulator capacity and DC output power, Field Monitoring System also pass through fieldbus
It is connected with some intelligent switch and controls the opening and closing of intelligent switch.The patent document can only use as uninterrupted power source, not have
The voltage compensation and control content of long distance power transmission, the remote direct current transportation being difficult to realize more than kilometer level.
Chinese patent literature CN103872675B includes：New energy direct current power photovoltaic array P1 incoming ends, P2 incoming ends,
Pn incoming ends, direct current input power line P1, direct current input power line P2, direct current input power line Pn, observation circuit, bus rod
It is protection circuit, control module, the power bus-bar that confluxes, bus rod lightning protection circuit, direct current output L1 ends, direct current output Lm ends, anti-
Thunder earth terminal, communication interface, system bus, DC output power line and electric-controlled switch circuit K1 and Km.It can be supplied with generating electricity
The change of electrical power carries out real-time monitoring, the electric power per DC output end all the way is met corresponding inversion subsystem electric power
Power reguirements, inverter is reached in the range of the electric power of Effec-tive Function, improve system effectiveness, save it is a large amount of from
Consumption, is even more important, effect is more notable for off-network electricity generating and supplying system.It is a plurality of that the patent document is that photovoltaic DC-to-AC converter can access
Multiple photovoltaic arrays of dc bus connection, the generated output of off-grid system is controlled by electric power, and the utility model is total
In line topological sum control method and document have the purpose of significant difference, used distributed Voltage dynamic control method be make it is small
The long distance powedr transmission line loss of line footpath is controlled in zone of reasonableness.
Utility model content
In view of the shortcomings of the prior art, the utility model provides a kind of remote distributed DC power-supply system.
The technical solution of the utility model is as follows：
A kind of remote distributed DC power-supply system, including cable for dc bus, set on the cables
Multiple distributed power generation modules and distributed loading module, in the two-way inverter that described dc bus one end is set to realize simultaneously
Net；The distributed power generation module is current mode power supply.The utility model arranges multiple distributed hairs on the dc bus
Electric module and distributed loading module, the two-way inverter is in one end of dc bus；The distributed power generation module is electricity
Flow pattern power supply, electric current is provided to dc bus with maximum power output under normal operating conditions, and two-way inverter then can basis
Busbar voltage adjusts the amount of generating electricity by way of merging two or more grid systems or power consumption, maintains DC bus-bar voltage balance.
Preferable according to the utility model, the system also includes being used to bear in the distributed power generation module, distribution
The control loop of closed loop regulation is carried out between lotus module and two-way inverter.
Preferable according to the utility model, when two-way inverter is in rectification working condition, the control loop includes：
Voltage regulator, voltage minimum judge module, overload adjustment module and the voltage clipping module of control output.Two-way inversion
When device is in rectification working condition, referred to as rectifier.The rectifier output voltage limitation set-point and rectifier are real
Border output voltage values make the difference, and difference inputs as voltage regulator；Each distribution node voltage sample is sentenced by voltage minimum
Disconnected module, exports the voltage minimum on dc bus, the input as overload adjustment module；The output of voltage regulator and super
Output and as rectifier the controlled quentity controlled variable of adjustment module is carried, completes control of the rectifier to dc bus output voltage.
Preferable according to the utility model, when two-way inverter is in inversion working condition, the control loop includes：
The voltage clipping module of multimode time lag voltage regulator, voltage max judge module and control output.Two-way inverter
During in inversion working condition, referred to as inverter.Each distribution node voltage sample judges mould by voltage max
Block, export the voltage max on dc bus；DC bus-bar voltage limits the voltage max on set-point and dc bus
Make the difference, input of the difference as multimode time lag voltage regulator；The output of multimode time lag voltage regulator limits through overvoltage
Controlled quentity controlled variable of the width module as inverter, complete the control of inverter dc bus input voltage.
Preferable according to the utility model, the cable is small line footpath double wire system cable；The length of the cable be 10~
20 kilometers.
The control method of above-mentioned remote distributed DC power-supply system, including it is as follows：
When distributed power generation module generation deficiency, then, the two-way inverter is operated in rectification state, by three-phase alternating current
Power network is powered to the direct current network where the remote distributed DC power-supply system；
When the distributed power generation module, which generates electricity, exceeds workload demand, then, the two-way inverter is operated in inversion shape
State, powered from the direct current network where the remote distributed DC power-supply system to three-phase alternating current power network.
The method for controlling the two-way inverter to be operated in rectification state is as follows：System is two-way inverse using closed loop feedback control
Become device dc bus side voltage.
By the dc bus commutating voltage Vo controls of two-way inverter below the highest control voltage of dc bus setting.
To reduce the line loss problem in being transmitted over long distances using small line footpath cable as far as possible, and protect dc bus will not overvoltage.Point
When cloth generating node electricity amount can not meet Highways ' distributed load, the remote distributed DC power-supply system
The direct current network at place needs to obtain electric energy from three-phase alternating current power network, and two-way inverter is operated in rectification state.By two-way inversion
The dc bus commutating voltage Vo of device is controlled below the highest control voltage of dc bus, to reduce the long-distance line of cable
Damage.
When the two-way inverter is operated in rectification state, when the distributed load of dc bus certain is excessive, cause
When DC bus-bar voltage is less than system worked well voltage, i.e. line node brownout, line loss is excessive, and system can not normal work
Make, then by unessential load bus temporary close, to maintain remote dc bus to be under normal line loss mode of operation；
When DC bus-bar voltage reaches system worked well voltage, and after reaching the magnitude of voltage of systemic presupposition, recover the negative of temporary close
Lotus node works.Because circuit is longer, the impedance and voltage drop on circuit are larger, therefore dc bus both ends have larger electricity
Pressure difference is, it is necessary to coordinate the working condition of control bus voltage and each distributed loading module, and each distributed power generation module
Grid-connected current be in maximum power output pattern, could preferably control the stabilization of remote DC electric power system.
When direct current network overloads, realized using overload adjustment module and the control of Vo voltages to the inessential load bus
Temporary close or recovery.
The method for controlling the two-way inverter to be operated in inverter mode is as follows：
The dc bus control system detects the terminal voltage of each node position, extracts distributed power generation module pair
The voltage max of node and distributed loading module corresponding node is answered, as the feedback quantity of closed-loop regulator, is formed big
Time lag closed-loop control system；By the inversion grid connection power of two-way inverter described in closed loop adjustment control, to control dc bus
The ceiling voltage of upper each node is no more than dc bus maximum operating voltage limit value.Due to feedback voltage can multiple nodes it
Between switch, different from the closed-loop feedback control system in single feedback signal source, therefore system need to design multimode time lag voltage tune
Section device is controlled with carrying out the voltage of distributed DC power network.When the generated energy of distributed power generation node is more sufficient, disclosure satisfy that
During workload demand on distributed DC power network, distributed DC network system will be in pattern of generating electricity by way of merging two or more grid systems, to three-phase alternating current
Power network exports electric energy.Because each generating node is current source, and generating as much as possible is wanted to, by institute's generated energy
It is grid-connected to produce greatest benefit, therefore each generating node only provides the output current of maximum capacity as current source, does not maintain
Busbar voltage balances.The work of busbar voltage balance is maintained to transfer to two-way inverter to complete, two-way inverter is responsible for providing one
Adjustable terminal voltage, maintain the terminal voltage stable in sets target value by adjusting grid-connected load.Each node module
Electrical nodes or generating node are used, electric current is obtained or provided to dc bus, the voltage everywhere on dc bus can be influenceed.
Because highway distributed DC power network line is grown, line drop is big, only controls two-way inverter dc bus side voltage to be difficult to
Whole line voltage is maintained in optimum state and controls line loss in the reasonable scope, therefore control described in the utility model need to be used
Method processed.
Advantage of the present utility model is：
For the utility model for disperseing along pipeline equipment, spacing is farther out, it is difficult to provides length for distributed small-sized electricity consumption facility
The technical problem of the electric power of phase stabilization, devises a remote distributed DC power-supply system applied in direct current network, makes
The voltage and current of longer dc bus is accurately controlled, and reaches stable operation of power networks effect.The utility model is in institute
State and multiple distributed power generation modules and distributed loading module are arranged on dc bus, the two-way inverter is in dc bus
One end：The distributed power generation module is current mode power supply, and electric current is provided to dc bus, and two-way inverter then can be according to mother
Line voltage adjusts the amount of generating electricity by way of merging two or more grid systems, and maintains DC bus-bar voltage balance.
Brief description of the drawings
Fig. 1 is systematic difference schematic diagram described in the utility model, and each node can access the renewable energies such as photovoltaic, wind-powered electricity generation
Source generator unit, or access load unit；
Fig. 2 is the structural representation of system described in the utility model；
Fig. 3 is in the utility model, and when distributed power generation module generation deficiency, the two-way inverter is operated in rectification
The schematic diagram of state；
Fig. 4 is in the utility model, when distributed power generation module, which generates electricity, exceeds workload demand, the two-way inverter work
Make the schematic diagram in inverter mode；
In Fig. 2-4, V1、V2……VNIt is magnitude of voltage of the dc bus at each node, VOIt is two-way inverter direct current
The magnitude of voltage of bus bar side；VminIt is the minimum value of each node voltage sampled value of dc bus；VmaxIt is each node of dc bus
The maximum of voltage sample value.
Embodiment
The utility model is described in detail with reference to embodiment and Figure of description, but not limited to this.
Embodiment 1,
A kind of remote distributed DC power-supply system, including cable for dc bus, set on the cables
Multiple distributed power generation modules and distributed loading module, in the two-way inverter that described dc bus one end is set to realize simultaneously
Net；The distributed power generation module is current mode power supply.
The system also includes being used between the distributed power generation module, distributed loading module and two-way inverter
Carry out the control loop of closed loop regulation.
When two-way inverter is in rectification working condition, the control loop includes：Voltage regulator, voltage minimum
The voltage clipping module of judge module, overload adjustment module and control output.When two-way inverter is in rectification working condition,
Referred to as rectifier.The rectifier output voltage limitation set-point and rectifier actual output voltage value make the difference, difference
Inputted as voltage regulator；Each distribution node voltage sample passes through voltage minimum judge module, exports on dc bus
Voltage minimum, as overload adjustment module input；The output of voltage regulator and the sum of the output for the adjustment module that overloads
As the controlled quentity controlled variable of rectifier, control of the rectifier to dc bus output voltage is completed.
When two-way inverter is in inversion working condition, the control loop includes：Multimode time lag voltage regulator,
Voltage max judge module and the voltage clipping module of control output., will when two-way inverter is in inversion working condition
It is referred to as inverter.Each distribution node voltage sample passes through voltage max judge module, exports the electricity on dc bus
Press maximum；The voltage max that DC bus-bar voltage is limited on set-point and dc bus makes the difference, when difference is as multimode
The input of stagnant voltage regulator；The output of multimode time lag voltage regulator is through control of the overvoltage clipping module as inverter
Amount, complete the control of inverter dc bus input voltage.
Embodiment 2,
A kind of remote distributed DC power-supply system as described in Example 1, its difference are that the cable is small line footpath
Double wire system cable；The length of the cable is 10~20 kilometers.
Claims (4)
1. a kind of remote distributed DC power-supply system, it is characterised in that the system includes the cable for dc bus, in institute
The multiple distributed power generation modules set on cable and distributed loading module are stated, is set in described dc bus one end two-way
Inverter is grid-connected to realize；The distributed power generation module is current mode power supply；The system also includes being used in the distribution
The control loop of closed loop regulation is carried out between formula electricity generation module, distributed loading module and two-way inverter.
2. a kind of remote distributed DC power-supply system according to claim 1, it is characterised in that at two-way inverter
When rectification working condition, the control loop includes：Voltage regulator, voltage minimum judge module, overload adjustment module
And the voltage clipping module of control output.
3. a kind of remote distributed DC power-supply system according to claim 1, it is characterised in that at two-way inverter
When inversion working condition, the control loop includes：Multimode time lag voltage regulator, voltage max judge module and
Control the voltage clipping module of output.
4. a kind of remote distributed DC power-supply system according to claim 1, it is characterised in that the cable is small line
Footpath double wire system cable；The length of the cable is 10~20 kilometers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721131512.7U CN207166135U (en) | 2017-09-05 | 2017-09-05 | A kind of remote distributed DC power-supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721131512.7U CN207166135U (en) | 2017-09-05 | 2017-09-05 | A kind of remote distributed DC power-supply system |
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| CN207166135U true CN207166135U (en) | 2018-03-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404115A (en) * | 2017-09-05 | 2017-11-28 | 山东鼎维数字技术有限公司 | A kind of remote distributed DC power-supply system and its control method |
| CN113765152A (en) * | 2021-07-23 | 2021-12-07 | 国网上海能源互联网研究院有限公司 | Chain type energy Internet suitable for expressway and canal and control method thereof |
-
2017
- 2017-09-05 CN CN201721131512.7U patent/CN207166135U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404115A (en) * | 2017-09-05 | 2017-11-28 | 山东鼎维数字技术有限公司 | A kind of remote distributed DC power-supply system and its control method |
| CN113765152A (en) * | 2021-07-23 | 2021-12-07 | 国网上海能源互联网研究院有限公司 | Chain type energy Internet suitable for expressway and canal and control method thereof |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Remote distributed DC power supply system and control method thereof Effective date of registration: 20181207 Granted publication date: 20180330 Pledgee: Qilu bank Limited by Share Ltd Ji'nan high tech branch Pledgor: Shandong Ding Wei Digital Technology Co., Ltd. Registration number: 2018370000222 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20200120 Granted publication date: 20180330 Pledgee: Qilu bank Limited by Share Ltd Ji'nan high tech branch Pledgor: Shandong Ding Wei Digital Technology Co., Ltd. Registration number: 2018370000222 |