CN104124714B - A kind of grid-connected Poewr control method of distributed power source, Apparatus and system - Google Patents
A kind of grid-connected Poewr control method of distributed power source, Apparatus and system Download PDFInfo
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Abstract
The grid-connected Poewr control method of one distributed power source of the present invention, it is characterised in that comprise the steps: to control the data that device obtains according to the voltage transformer summation current transformer sampling at points of common connection PCC, calculate the active-power P at PCC in real timecal；Control device and obtain the service data of distributed power source DG；Described control device is according to PcalWith limit value PsetBetween magnitude relationship, control and regulation distributed power source DG power output.Additionally the present invention also disclosed and controls Apparatus and system accordingly.Pass through the present invention program, when power supply area internal loading cannot be dissolved on the spot completely at valley, distributed power source DG generated energy, control and regulation distributed power source DG power output, meet the electrical network requirement to online power, and distributed power source DG generated energy can on-site elimination when power supply area internal loading is at peak value, allow distributed power source DG full power generate electricity, the most both improve distributed power source DG access capacity, and in turn ensure that the safe operation of electrical network.
Description
Technical field
The present invention relates to distributed generation technology field, more particularly, it relates to a kind of grid-connected merit of distributed power source
Rate control method, Apparatus and system.
Background technology
Distributed power source (DG), it is common that refer to be near user, generated electricity energy local use, with 10
Kilovolt and following electric pressure access electrical network, and capacity, at the generator unit of several kilowatts to several megawatts, mainly includes wind
The forms of electricity generation such as energy, solar energy, water energy, natural gas, geothermal energy, ocean energy, biomass energy.
A large amount of DG access power distribution network, become many power supply architectures, trend by making traditional distribution radial structure
Size and Orientation all will change, subordinate's electrical network likely can superior grid transmission, power distribution network itself
Voltage's distribiuting also will be varied from.The measure limiting DG capacity is the most typically taked to reduce power as far as possible
Send the adverse effect to electrical network, such as " Q/GDW480-2010 distributed power source accesses electric power network technique regulation " requirement
DG total capacity is in principle no more than in upper level transformer-supplied region the 25% of peak load.This machinery
DG capacity limit measure hinders the exploitation application of distributed clean energy resource undoubtedly, and actually limits DG capacity
Essence be to limit online power, therefore for electricity can the DG application scenario of on-site elimination, can adopt
Take the measure limiting online power replacement restriction DG capacity, the most both ensure that the safety of electrical network, and improve again
The access capacity of DG, has promoted the development of distributed power generation.
Summary of the invention
In order to improve the access capacity of DG, with limit DG online power, meet the safety requirements of electrical network, this
Invention provides a kind of grid-connected Poewr control method of distributed power source and device.
To achieve these goals, the scheme of proposition is as follows: a kind of grid-connected Poewr control method of distributed power source,
It is characterized in that, comprise the steps: to control device according to the voltage transformer at points of common connection PCC and electricity
The data that current transformer sampling obtains, calculate the active-power P at PCC in real timecal；Control device and obtain distribution
The service data of formula power supply DG；Described control device is according to PcalWith limit value PsetBetween magnitude relationship, control
System regulation distributed power source DG power output.
In such scheme, before step described in claim 1, also include step, at distributed power source DG also
Net PCC switch cubicle on or described PCC at independent group screen installation described control device.
In such scheme, described control device and distributed power source DG are by twisted-pair feeder, optical fiber or wireless carry out
Connect.
In such scheme, described service data comprises one or more of data below: current generated output, volume
Determine power, definite value is gained merit in maximum allowable output.
In such scheme, the described meritorious definite value of permission output is read-write, controls device and is revised by communication message
The mode of this definite value reaches to regulate the purpose of distributed power source DG generated output.
In such scheme, described limit value PsetCan be the value being set in advance in and controlling device, it is also possible to be to connect
Receive the value that self scheduling issues.
In such scheme, the step in claim 1, perform once every the fixed cycle, this cycle value model
Enclose is 1 to 15 minute.
In such scheme, described control device is according to PcalWith limit value PsetBetween magnitude relationship, control and regulation
DG power exports, and refers specifically to:
Condition (1): work as Pcal>PsetTime, control device issues toward distributed power source DG to subtract to send out and controls a desired value；
Condition (2): work as Pcal<K2PsetTime, control device and issue additional issue control target toward distributed power source DG
Value；
Condition (3): when being unsatisfactory for above-mentioned condition (1) and condition (2), controls device not toward distributed
Power supply DG issues controlling value；
Described K2Meet 0 < K2<1。
In such scheme, described distributed power source DG comprises two or more generator unit, by distribution
Formula power supply DG electrical generation priority level sequential control.
In such scheme, described distributed power source DG electrical generation priority level, refer to distributed power source DG according to
The height of quantification of targets result, evaluate electrical generation priority level, described index include but not limited to power benefit index,
Energy-conserving and environment-protective index.
Additionally the present invention also provides for a kind of grid-connected output control device of distributed power source, it is characterised in that comprise collection
Module, computing module, control module, communication module；
Described acquisition module is connected with the voltage transformer at PCC, current transformer；
Described computing module is respectively connected with described acquisition module, control module, communication module；
Described control module is respectively connected with described acquisition module, computing module, communication module；
Wherein:
Voltage at PCC, electric current are sampled by described acquisition module；
Described computing module is calculated active power at PCC according to the sampled result of acquisition module；
Described communication module downstream interface connects distributed power source DG and controls equipment, it is thus achieved that distributed power source DG
Service data；Upstream Interface connects dispatching of power netwoks main website, accepts dispatching of power netwoks control instruction；
Described control module is according to the result of computing module, it is judged that the active power at PCC and limit value it
Between magnitude relationship, control distributed power source DG power output and PCC switch.
Additionally the present invention also provides for a kind of grid-connected power control system of distributed power source, it is characterised in that include point
Cloth power supply DG, control device and scheduling station；It is grid-connected that described control device is arranged on distributed power source DG
Independent group screen is installed on the switch cubicle of PCC or at described PCC, by twisted-pair feeder, optical fiber or wireless and institute
State distributed power source DG to be attached, be connected by optical fiber or wireless with described scheduling station.
The invention has the beneficial effects as follows: provide a kind of grid-connected Poewr control method of distributed power source and device,
When power supply area internal loading cannot be dissolved on the spot completely at valley, DG generated energy, control and regulation DG power is defeated
Go out, meet the electrical network requirement to online power, and DG generated energy can be just when power supply area internal loading is at peak value
Dissolve, allow DG full power generate electricity, the most both improve DG access capacity, in turn ensure that electrical network safety fortune
OK.
Accompanying drawing explanation
The grid-connected Poewr control method of a kind of distributed power source that Fig. 1 provides for the embodiment of the present invention and the knot of device
Composition；
The information interaction figure controlled between device and DG that Fig. 2 provides for the embodiment of the present invention；
Patrolling of the grid-connected Poewr control method of a kind of distributed power source that Fig. 3 provides for the embodiment of the present invention and device
Collect block diagram；
The grid-connected Poewr control method of a kind of distributed power source that Fig. 4 provides for another embodiment of the present invention and device
Logic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the present invention rather than complete
The embodiment in portion.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under dynamic premise, broadly falls into the scope of protection of the invention.
The structure chart of the grid-connected output control device of a kind of distributed power source that Fig. 1 provides for the embodiment of the present invention,
Control device is set at the PCC that distributed power source DG is grid-connected, control device comprise acquisition module, computing module,
Control module, communication module.Acquisition module is connected with PCC point PT, CT, obtains at PCC from PT, CT
Voltage, electric current, and it is calculated active-power P at PCC by computing modulecal；Communication module and and DG
Use twisted-pair feeder, optical fiber or radio communication to connect, read current generated output P from distributed power source DGDG、
Rated power PDGnom, maximum allowable output gains merit definite value PDGset.As in figure 2 it is shown, PDGsetIt is worth read-write,
Control device and revise this value to the purpose controlling distributed power source DG generated output by communication message.
Additionally the present invention is also provided for a kind of system, including distributed power source DG, distribution provided by the present invention
Formula power grid output control device and scheduling station；It is grid-connected that described control device is arranged on distributed power source DG
PCC switch cubicle on or at described PCC independent group screen install, by twisted-pair feeder, optical fiber or wireless with
Described distributed power source DG is attached, and is connected by optical fiber or wireless with described scheduling station.
Embodiment one
Fig. 3 be when with control device communication connection distributed power source DG only one of which generator unit time embodiment
A kind of distributed power source DG grid-connected power control logic figure provided, step is as follows:
(1) control device and read PDG、PDGnom、PDGset, calculate active-power P at PCCcal
(2) according to PcalWith limit value PsetBetween magnitude relationship, control distributed power source DG
Power exports, concrete:
A) P is detected when control devicecal>Pset, and when communicating normal with distributed power source DG,
Toward PDGsetWrite PDG+Pcal-K1PsetValue；P is detected when controlling devicecalMore than Pset, but
During with distributed power source DG communication abnormality, direct tripping PCC switchs；
B) P is detected when control devicecal<K2Pset, and just communicate with distributed power source DG
Chang Shi, it is judged that PDGsetWhether meet less than PDGnomIf meeting, toward PDGsetIn write PDGnom
With PDG+K1Pset-PcalIn smaller value, if being unsatisfactory for, terminate flow process.
C) P is detected when control devicecal<K2Pset, with distributed power source DG communication abnormality
Time, not toward PDGsetIn write value；
D) P is detected when control devicecal<K1PsetAnd more than K2PsetTime, not toward PDGsetIn
Write value.
K is set1And K2The purpose of value is to prevent because PCC point power is in limit value border, frequently regulating
DG power, K1、K2Span is: 0 < K2<K1< 1,
(3) DG generated output is frequently regulated, when step (2) completes in order to avoid control device
After, control device and pass through an internal counter timing, when reaching delay time, reenter step
(1), the most desirable 1～15 minute of this delay value.
Embodiment two
Fig. 4 is that embodiment carries when having multiple generator unit with the distributed power source DG controlling device communication connection
A kind of distributed power source DG grid-connected power control logic figure of confession, for understanding this embodiment of explanation, it is assumed that there is N
Individual distributed power source distributed power source DG, is numbered each distributed power source DG, according to power benefit or
Energy-conserving and environment-protective are estimated, the numbered DG of distributed power source DG of override generating1, the numbering of second priority generating
For DG2, by that analogy, the numbered DG of DG that priority is minimumN.Reference numeral is the distributed power source DG of j
Current generated output is designated PDGj, rated power be designated PDGjnom, maximum allowable output gain merit definite value mark
For PDGjset, wherein j ∈ [1, N].
A kind of DG grid-connected power control logic figure that embodiment provides, step is as follows:
(1) control device and read the P of each distributed power source DGDGj、PDGjnom、PDGjsetValue, j
∈ [1, N], calculates active-power P at PCCcal
(2) as shown in Figure 4, power control concrete grammar:
A) P is detected when control devicecal>PsetTime, preferentially to DGNCarry out subtracting power control, if desired
Subtract the power target value P sent outcal-K1PsetLess than current DGNGenerated output PDGN, then toward PDGNsetIn write
PDGN-Pcal+K1PsetAfter value, terminate flow process；If desired the power target value P sent out is subtractedcal-K1PsetMore than working as
Front DGNGenerated output PDGN, then directly to DGNSend out and shut down or standby command, the most successively to DGN-1Carry out
Subtract power control, until all DG subtract the performance number sent out more than or equal to Pcal-K1Pset, terminate flow process.
B) P is detected when control devicecal>PsetTime, if with whole distributed power source DG communication disruption,
Then tripping PCC switch, terminates flow process；
C) P is detected when control devicecal>PsetTime, if part distributed power source DG communication disruption, then
This part distributed power source DG is not carried out power control, if other distributed power sources DG all shuts down or treats
Machine still can not meet subtract send out power target value, then tripping PCC switch, terminate flow process；
D) P is detected when control devicecal<K2PsetTime, preferentially to DG1Carry out increasing power to control, if DG1
Do not possesses the condition (P of power additional issueDG1set=PDG1nom), the most not to DG1Carry out power additional issue to control, depend on
Secondary to DG2Implement additional issue power to control；If DG1Possesses the condition (P of power additional issueDG1set<PDG1nom),
And need the power target value K of additional issue1Pset-PcalLess than or equal to current DG1The generated output that can issue additional
PDG1nom-PDG1, toward PDG1setIn write PDG1+K1Pset-PcalAfter value, terminate flow process；If DG1Possesses merit
Condition (the P of rate additional issueDG1set<PDG1nom), need the power target value K of additional issue1Pset-PcalMore than current
DG1The generated output P that can issue additionalDG1nom-PDG1, toward PDG1setIn write PDG1nomValue, more successively to DG2
Carry out increasing power to control, until all DG additional issue performance number sum is equal or close to the power mesh needing additional issue
Scale value K1Pset-PcalAfter, terminate flow process；
E) P is detected when control devicecal<K2PsetTime, if partly or entirely distributed power source DG communication
Interrupt, then the DG interrupted is not carried out power control；
F) K is detected when control device2Pset≤Pcal≤K1PsetTime, to all distributed power source DG
The rate of doing work does not controls, and terminates flow process.
K is set1And K2The purpose of value is to prevent because PCC point power is in limit value border, frequently regulating
DG power, K1、K2Span is: 0 < K2<K1< 1,
(3) DG generated output is frequently regulated, when step (2) completes in order to avoid control device
After, control device and pass through an internal counter timing, when reaching delay time, reenter step
(1), the most desirable 5～15 minutes of this delay value.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses this
Bright.Multiple amendment to these embodiments will be apparent from for those skilled in the art, this
General Principle defined in literary composition can be implemented at other without departing from the spirit or scope of the present invention
Example realizes.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and be to fit to
Principles disclosed herein and the consistent the widest scope of features of novelty.
Claims (3)
1. the grid-connected Poewr control method of distributed power source, it is characterised in that comprise the steps:
Control the number that device obtains according to the voltage transformer summation current transformer sampling at points of common connection PCC
According to, calculate the active-power P at PCC in real timecal；Control device and obtain the service data of distributed power source DG；
Described control device is according to PcalWith limit value PsetBetween magnitude relationship, control to adjust distributed power source DG merit
Rate exports；
Described control device is according to PcalWith limit value PsetBetween magnitude relationship, control to adjust distributed power source
DG power exports, and refers specifically to:
Condition (1): work as Pcal>PsetTime, control device issues toward distributed power source DG to subtract to send out and controls a desired value；
Condition (2): work as Pcal<K2PsetTime, control device and issue additional issue control target toward distributed power source DG
Value；
Condition (3): when being unsatisfactory for above-mentioned condition (1) and condition (2), controls device not toward distributed
Power supply DG issues controlling value；
Described K2Meet 0 < K2<1。
2. a kind of grid-connected Poewr control method of distributed power source as claimed in claim 1, it is characterised in that
Described distributed power source DG comprises two or more generator unit, by distributed power source DG electrical generation priority
Level sequential control.
3. a kind of grid-connected Poewr control method of distributed power source as claimed in claim 2, it is characterised in that
Described distributed power source DG electrical generation priority level, refers to distributed power source DG according to the height of quantification of targets result
Low, evaluate electrical generation priority level, described index includes but not limited to power benefit index, energy-conserving and environment-protective index.
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| CN106487040A (en) * | 2015-08-26 | 2017-03-08 | 中兴通讯股份有限公司 | Photovoltaic electric network control method and device |
| CN106208087B (en) * | 2016-08-02 | 2019-05-21 | 南京南瑞继保电气有限公司 | A kind of industrial enterprise's self power generation method for controlling power balance |
| CN106230023B (en) * | 2016-08-22 | 2018-09-28 | 中国石油化工股份有限公司洛阳分公司 | A kind of upper off line power method for automatically regulating of industrial power plant |
| CN107017659B (en) * | 2017-03-29 | 2019-07-12 | 石家庄科林电气股份有限公司 | The method for carrying out flexible power generation based on photovoltaic power station area protection system |
| CN107017660B (en) * | 2017-03-29 | 2019-07-12 | 石家庄科林电气股份有限公司 | The grid-connected protection system in photovoltaic power station region and grid-connected control method |
| CN107508314B (en) * | 2017-08-10 | 2020-07-10 | 杭州赫智电子科技有限公司 | Distributed photovoltaic protection system and protection method |
| CN114498936B (en) * | 2022-02-11 | 2024-02-23 | 国网江苏省电力有限公司电力科学研究院 | Distributed power supply regulation and control system, method and device |
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| EP2084801B1 (en) * | 2006-10-26 | 2010-05-05 | KAESTLE, Gunnar | Method for operating a low-voltage electrical system |
| CN103545931A (en) * | 2013-10-30 | 2014-01-29 | 国家电网公司 | A distributed photovoltaic power generation grid-connected interface device |
| CN203536975U (en) * | 2013-10-10 | 2014-04-09 | 国家电网公司 | Distributed power generating grid-connected control circuit |
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| EP2084801B1 (en) * | 2006-10-26 | 2010-05-05 | KAESTLE, Gunnar | Method for operating a low-voltage electrical system |
| CN203536975U (en) * | 2013-10-10 | 2014-04-09 | 国家电网公司 | Distributed power generating grid-connected control circuit |
| CN103545931A (en) * | 2013-10-30 | 2014-01-29 | 国家电网公司 | A distributed photovoltaic power generation grid-connected interface device |
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