CN108879797A - A kind of active distribution network port PQ control method - Google Patents
A kind of active distribution network port PQ control method Download PDFInfo
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- CN108879797A CN108879797A CN201810922226.5A CN201810922226A CN108879797A CN 108879797 A CN108879797 A CN 108879797A CN 201810922226 A CN201810922226 A CN 201810922226A CN 108879797 A CN108879797 A CN 108879797A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention discloses a kind of active distribution network port PQ control methods, include the following steps：(1) three-phase voltage and electric current inputted at active distribution network port is acquired；(2) active-power P inputted at active distribution network port is calculated according to the voltage and current that step (1) acquisition obtainsPCCAnd reactive power QPCC；(3) the port reference active power of setting is calculatedWith active-power PPCCBetween difference DELTA PPCC, by Δ PPCCIt inputs in PI control module, obtains port active power deviation compensation amount δ PPCC；(4) the port reference reactive power of setting is calculatedWith reactive power QPCCBetween difference DELTA QPCC, by Δ QPCCIt inputs in PI control module, obtains port reactive power deviation compensation amount δ QPCC；(5) by port active and reactive power deviation compensation amount δ PPCC、δQPCCIt is delivered separately to each distributed generation resource；(6) distributed generation resource generates real power control signal；(7) distributed generation resource generates idle control signal；(8) each distributed generation resource is inputted active and Reactive Power Control signal as the control of respective inverter.
Description
Technical field
The present invention relates to power distribution network port power control technology field, in particular to a kind of active distribution network port PQ control
Method.
Background technique
As society and expanding economy, people constantly increase the demand of the energy, the shortage of fossil energy and people
To the attention of environmental protection so that various countries increasingly pay close attention to the development and utilization of new energy.Therefore, as distributed energy is big
Amount access power distribution network, traditional power distribution network has become active distribution network, and the trend at its port is showed and do not known greatly
Property.This causes difficulty to the stable operation of bulk power grid and power dispatching.In order to solve this problem, it is necessary to active distribution
Net port power is controlled.
In the prior art, control active distribution network port power mostly uses inverter or energy storage to compensate control, such as discloses
Number a kind of control method of power grid distributed generation resource based on hybrid energy-storing is disclosed for the patent document of CN 102983589A,
Include the following steps：The topological structure of optimization design distributed generation resource；It is assisted by DC/DC convertor controls mode normalization creep function
Regulate and control DC power-supply system processed；Exchange the power grid self adaptive control of side DC/AC inverter.The distributed generation resource both may be incorporated into big electricity
Net operation reduces influence of the intermittent renewable energy electricity generation grid-connecting to power grid, and provides voltage and frequency support to power grid；
Also it may be incorporated into micro-capacitance sensor, the group net unit as off-network type micro-capacitance sensor is run, and maintains the voltage of off-network type micro-capacitance sensor and frequency steady
It is fixed；When external electrical network breaks down, which can also realize the double mode switching of grid-connected/isolated island, improve system
The power supply reliability of middle important load.Above-mentioned distributed generation resource is utilized by energy type and the cooperation of power-type energy-storage system, is improved
Whole system technical performance and economic performance.In another example the patent document of Publication No. CN104701849B discloses a kind of master
The dynamic full distributed self-discipline voltage control method of power distribution network, is divided into two stages：First stage is to establish voltage-controlled convex loose mould
Type；Feeder line is divided into several control zones, a control zone can be one or several buses and be articulated in power generation above
Machine and reactive power compensator；The overall situation is acquired using alternating direction multipliers method using the local and communication with neighbours in each control zone
The optimal local control amount of voltage's distribiuting；Second stage is transformer substation side by the adjusting to feeder line root node voltage magnitude, is made
The safety margin for obtaining voltage magnitude distribution is as big as possible.Two stage iteration operations, until not new optimization operation.On
Method is stated suitable for the distribution network voltage control after large-scale distributed power grid, the data of control zone can be protected well
Privacy, the control method have very high agility and flexibility.
But above-mentioned control mode both increases equipment cost, and again without point made full use of in active distribution network
The power supply of cloth.It is therefore proposed that new active distribution network port PQ control method, does not need to add additional inverter or energy storage
Equipment, and distributed generation resource existing in power distribution network is made full use of, become particularly significant and significant.
Summary of the invention
The present invention provides a kind of active distribution network port PQ control methods, have not both needed to add at active distribution network port
Add additional inverter or energy storage device, and can make full use of distributed generation resource existing in power distribution network.
A kind of active distribution network port PQ control method, includes the following steps：
(1) the three-phase voltage v inputted at active distribution network port (PCC) is acquiredabcWith electric current iabc；
(2) active power inputted at active distribution network port is calculated according to the voltage and current that step (1) acquisition obtains
PPCCAnd reactive power QPCC；
(3) the port reference active power of setting is calculatedThe active-power P being calculated with step (2)PCCBetween
Difference DELTA PPCC, by Δ PPCCIt inputs in PI control module, obtains port active power deviation compensation amount δ PPCC；
(4) the port reference reactive power of setting is calculatedThe reactive power Q being calculated with step (2)PCCBetween
Difference DELTA QPCC, by Δ QPCCIt inputs in PI control module, obtains port reactive power deviation compensation amount δ QPCC；
(5) by port active and reactive power deviation compensation amount δ PPCC、δQPCCIt is delivered separately to each in active distribution network
Distributed generation resource；
(6) each distributed generation resource is receiving the active power deviation compensation amount δ P transmitted at portPCCAfterwards, had according to itself
Function output power limit generates real power control signal.It is active by taking any one distributed generation resource i in active distribution network as an example
Control signal is Pi-ref；
(7) each distributed generation resource is receiving the reactive power deviation compensation amount δ Q transmitted at portPCCAfterwards, according to itself nothing
Function output power limit generates idle control signal.It is idle by taking any one distributed generation resource i in active distribution network as an example
Control signal is Qi-ref；
(8) each distributed generation resource is using the obtained active and Reactive Power Control signal in step (6) and (7) as respectively
The control of inverter inputs, and realizes tracking of the inverter output power to power instruction.It, will step in a distributed manner for power supply i
Suddenly P obtained in (6) and step (7)i-refAnd Qi-refControl signal as distributed electrical source inventer inputs inverter, real
Existing tracking of the inverter output power to power instruction.Each distributed generation resource is indirectly realized pair by controlling itself output power
The active control with reactive power in port, makes port input active-power PPCCAnd reactive power QPCCGiven reference value is tracked respectivelyWith
The present invention can be realized the given reference value of the tracking of the active and idle input power at active distribution network port, this
Inventive method is by passing through a PI controller for the deviation of input power and given reference power at active distribution network port
Port power thermal compensation signal is generated, and the thermal compensation signal is passed to all distributed generation resources in power distribution network.Each distributed electrical
Source generates power control signal in conjunction with respective output power limit and inputs respective inverter, realizes inverter output power pair
The tracking of power instruction.According to conservation of energy principle, input power and reference value are distributed there are when deviation at power distribution network port
Formula power supply is compensated deviation, and the reference value that the input power tracking at power distribution network port gives may be implemented.
The method of the present invention is generating active power thermal compensation signal δ P at power distribution network portPCCWhen, a PI link is used,
Reduce δ PPCCFluctuation, keep the variation of the active power during power compensation gentler.The method of the present invention is matched in generation
Reactive power compensation signal δ Q at power grid portPCCWhen, a PI link is used, δ Q is reducedPCCFluctuation, make power compensation
The variation of reactive power in the process is gentler.
The PI controller of active power is by a ratio controlling unit (K in the present inventionP-P) and an integration control linkIt composes in parallel；The PI controller of reactive power is by a ratio controlling unit (KP-Q) and an integration control linkIt composes in parallel.
In order to further make the variation of the active power during power compensation gentler, it is preferred that in step (3),
By the active input power P in the port being calculatedPCCWith port reference active powerBetween difference DELTA PPCCInput PI control
In molding block, port active power deviation compensation amount δ P is obtainedPCC, calculation formula is as follows：
Wherein：
KP-PFor ratio control parameter；
KI-PFor integration control parameter；
S is the complex variable in Laplace transform.
Choose KP-QWhen in order to obtain faster initial convergence speed, can choose value bigger than normal, it is preferred that KP-Q=
1~5.
KI-QValue can according to power tracking rate request and maximum overshoot limitation through examination gather to obtain, it is preferred that KI-Q=
0.1~0.5.
In order to further make the variation of the reactive power during power compensation gentler, it is preferred that in step (4),
By the idle input power Q in the port being calculatedPCCWith port reference reactive powerBetween difference DELTA QPCCInput PI control
In molding block, port reactive power deviation compensation amount δ Q is obtainedPCC, calculation formula is as follows：
Wherein：
KP-QFor ratio control parameter；
KI-QFor integration control parameter；
S is the complex variable in Laplace transform.
Choose KP-QWhen in order to obtain faster initial convergence speed, can choose value bigger than normal, it is preferred that KP-Q=
1~5.
KI-QValue can according to power tracking rate request and maximum overshoot limitation through examination gather to obtain, it is preferred that KI-Q=
0.1~0.5.
The method of the present invention is when generating distributed generation resource active power controller signal, it is contemplated that the wattful power of distributed generation resource
Rate export-restriction enables distributed generation resource to operate normally in trouble free service section, it is preferred that each to be distributed in step (6)
Formula power supply is receiving the active power deviation compensation amount δ P transmitted at portPCCAfterwards, it is generated according to itself active output power limit
Real power control signal, by taking any one distributed generation resource i in active distribution network as an example, real power control signal Pi-refGeneration machine
It makes as follows：
Wherein：
PiFor the measured value of the active output power of distributed generation resource i；
For the active output power of maximum of distributed generation resource i.
The method of the present invention is when generating distributed generation resource Reactive Power Control signal, it is contemplated that the idle function of distributed generation resource
Rate export-restriction enables distributed generation resource to operate normally in trouble free service section, it is preferred that each to be distributed in step (7)
Formula power supply is receiving the reactive power deviation compensation amount δ Q transmitted at portPCCAfterwards, it is generated according to own reactive output power limit
Idle control signal, by taking any one distributed generation resource i in active distribution network as an example, idle control signal Qi-refGeneration machine
It makes as follows：
Wherein：
QiFor the measured value of the idle output power of distributed generation resource i；
For the idle output power of maximum of distributed generation resource i；
For the maximum apparent energy of distributed generation resource i.
In conclusion not needing not only to pacify at port using active distribution network port PQ control method proposed by the present invention
Additional control equipment is filled, and can quickly realize that port input power tracks given value.Each distribution in power distribution network
Formula power supply also all works in trouble free service section.
In order to improve compensation speed, it is preferred that in step (5), passed in active distribution network by way of broadcast
Each distributed generation resource.Power distribution network port power deviation is transmitted to each distributed generation resource by the way of broadcast, makes it simultaneously
Power compensation is carried out, has compensation speed fast, the good feature of robustness.
In the present invention using broadcast mode be by radio wave carry out information transmitting by the way of.The function of power distribution network port
Rate deviation signal is transmitted to each distributed generation resource in active distribution network by way of radio communication.What this information was propagated
Mode has speed fast, at low cost, the good feature of robustness.Each distributed generation resource in active distribution network can be made timely to obtain
It obtains the compensated information of power distribution network port power and is compensated.It can also in addition, transmitting power deviation signal by the way of broadcast
Keep each distributed generation resource with uniformity to the compensation of power distribution network port power, effectively prevents in distributed generation resource compensation process
Because compensation direction is inconsistent and caused by the low problem of compensation efficiency.
Beneficial effects of the present invention：
(1) present invention can realize function at active distribution network port in the case where not increasing the equipment such as current transformer, energy storage
Tracking of the rate to given reference value, saves equipment input cost.
(2) present invention considers the respective output power capacity limit of distributed generation resource, and ensure that distributed generation resource can
By safe operation.
Detailed description of the invention
Fig. 1 is the wire frame flow chart of active distribution network port PQ control method of the invention.
Fig. 2 is the schematic diagram using the active distribution network of the method for the present invention.
Fig. 3 is the wire schematic diagram using the distributed generation resource overall control of the method for the present invention.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing：
As shown in Fig. 1~2, the active distribution network port PQ control method of the present embodiment includes the following steps：
(1) the three-phase voltage v inputted at active distribution network port (PCC) is acquiredabcWith electric current iabc；
(2) active-power P inputted at active distribution network port is calculatedPCCAnd reactive power QPCC；
(3) the port reference active power of setting is calculatedWith active-power PPCCBetween difference DELTA PPCC, by Δ PPCC
It inputs in PI control module, obtains port active power deviation compensation amount δ PPCC, δ PPCCValue be：
Wherein：
KP-PFor ratio control parameter；
KI-PFor integration control parameter；
S is the complex variable in Laplace transform.
(4) the port reference reactive power of setting is calculatedWith reactive power QPCCBetween difference DELTA QPCC, by Δ QPCC
It inputs in PI control module, obtains port reactive power deviation compensation amount δ QPCC, δ QPCCValue be：
Wherein：
KP-QFor ratio control parameter；
KI-QFor integration control parameter；
S is the complex variable in Laplace transform.
(5) by port active and reactive power deviation compensation amount δ PPCC、δQPCCIt is passed to by way of broadcast respectively actively
Each distributed generation resource in power distribution network；
(6) as shown in figure 3, the distributed generation resource receives by taking any one distributed generation resource i in active distribution network as an example
Port active power deviation compensation amount δ PPCCAfterwards according to itself output power limit, active power controller signal P is generatedi-ref,
Calculation formula is respectively：
Wherein：
PiFor the measured value of the active output power of distributed generation resource i；
For the active output power of maximum of distributed generation resource i.
(7) distributed generation resource receives port reactive power deviation compensation amount δ Q simultaneouslyPCCIt is limited afterwards according to itself output power
System generates Reactive Power Control signal Qi-ref, calculation formula is respectively：
Wherein：
QiFor the measured value of the idle output power of distributed generation resource i；
For the idle output power of maximum of distributed generation resource i；
For the maximum apparent energy of distributed generation resource i.
(8) each distributed generation resource is using the obtained active and Reactive Power Control signal in step (6) and (7) as respectively
The control of inverter inputs, and realizes tracking of the inverter output power to power instruction.It, will step in a distributed manner for power supply i
Suddenly P obtained in (6) and step (7)i-refAnd Qi-refControl signal as distributed electrical source inventer inputs inverter, real
Existing tracking of the inverter output power to power instruction.Each distributed generation resource is indirectly realized pair by controlling itself output power
The active control with reactive power in port, makes port input active-power PPCCAnd reactive power QPCCGiven reference value is tracked respectivelyWith
In conclusion the present embodiment can realize active distribution network in the case where not increasing the equipment such as current transformer, energy storage
Tracking of the power to given reference value at port.Save equipment input cost；The present embodiment is by the way of broadcast by distribution
Net port power deviation is transmitted to each distributed generation resource, makes it while carrying out power compensation.Fast with compensation speed, robustness is good
The characteristics of；The present embodiment considers the respective output power capacity limit of distributed generation resource, ensure that the reliable of distributed generation resource
Safe operation.
Claims (8)
1. a kind of active distribution network port PQ control method, which is characterized in that include the following steps：
(1) the three-phase voltage v inputted at active distribution network port is acquiredabcWith electric current iabc；
(2) active-power P inputted at active distribution network port is calculated according to the voltage and current that step (1) acquisition obtainsPCCWith
Reactive power QPCC；
(3) the port reference active power of setting is calculatedThe active-power P being calculated with step (2)PCCBetween difference
ΔPPCC, by Δ PPCCIt inputs in PI control module, obtains port active power deviation compensation amount δ PPCC；
(4) the port reference reactive power of setting is calculatedThe reactive power Q being calculated with step (2)PCCBetween difference
ΔQPCC, by Δ QPCCIt inputs in PI control module, obtains port reactive power deviation compensation amount δ QPCC；
(5) by port active and reactive power deviation compensation amount δ PPCC、δQPCCThe each distribution being delivered separately in active distribution network
Formula power supply；
(6) each distributed generation resource is receiving the active power deviation compensation amount δ P transmitted at portPCCAfterwards, active defeated according to itself
Power limit generates real power control signal out；
(7) each distributed generation resource is receiving the reactive power deviation compensation amount δ Q transmitted at portPCCAfterwards, defeated according to own reactive
Power limit generates idle control signal out；
(8) each distributed generation resource is using the obtained active and Reactive Power Control signal in step (6) and (7) as respective inversion
The control of device inputs, and realizes tracking of the inverter output power to power instruction.
2. active distribution network port PQ control method as described in claim 1, which is characterized in that in step (3), will calculate
The active input power P in the port arrivedPCCWith port reference active powerBetween difference DELTA PPCCIt inputs in PI control module,
Obtain port active power deviation compensation amount δ PPCC, calculation formula is as follows：
Wherein：
KP-PFor ratio control parameter；
KI-PFor integration control parameter；
S is the complex variable in Laplace transform.
3. active distribution network port PQ control method as described in claim 1, which is characterized in that in step (4), will calculate
The port arrived is idle input power QPCCWith port reference reactive powerBetween difference DELTA QPCCIt inputs in PI control module,
Obtain port reactive power deviation compensation amount δ QPCC, calculation formula is as follows：
Wherein：
KP-QFor ratio control parameter；
KI-QFor integration control parameter；
S is the complex variable in Laplace transform.
4. active distribution network port PQ control method as described in claim 1, which is characterized in that in step (6), each distribution
Power supply is receiving the active power deviation compensation amount δ P transmitted at portPCCAfterwards, had according to itself active output power limit
Power control signal, by taking any one distributed generation resource i in active distribution network as an example, real power control signal Pi-refGeneration mechanism
It is as follows：
Wherein：
PiFor the measured value of the active output power of distributed generation resource i；
For the active output power of maximum of distributed generation resource i.
5. active distribution network port PQ control method as claimed in claim 4, which is characterized in that in step (7), each distribution
Power supply is receiving the reactive power deviation compensation amount δ Q transmitted at portPCCAfterwards, nothing is generated according to own reactive output power limit
Power control signal, by taking any one distributed generation resource i in active distribution network as an example, idle control signal Qi-refGeneration mechanism
It is as follows：
Wherein：
QiFor the measured value of the idle output power of distributed generation resource i；
For the idle output power of maximum of distributed generation resource i；
For the maximum apparent energy of distributed generation resource i.
6. active distribution network port PQ control method as described in claim 1, which is characterized in that in step (5), pass through broadcast
Mode pass to each distributed generation resource in active distribution network.
7. active distribution network port PQ control method as described in claim 3 or 4, which is characterized in that KP-Q=1~5.
8. active distribution network port PQ control method as described in claim 3 or 4, which is characterized in that KI-Q=0.1~0.5.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061526A (en) * | 2019-05-27 | 2019-07-26 | 浙江大学 | A kind of schedulable inverter droop control method |
| CN110829423A (en) * | 2019-11-18 | 2020-02-21 | 浙江大学 | Distributed power system stabilizer and method |
| CN112467799A (en) * | 2021-01-25 | 2021-03-09 | 国网江西省电力有限公司电力科学研究院 | Grid-connected control method and device for battery energy storage system |
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|---|---|---|---|---|
| CN104158229A (en) * | 2014-07-17 | 2014-11-19 | 浙江大学 | Secondary control method suitable for micro-grid system comprising various distributed power supplies |
| CN104779640A (en) * | 2015-04-15 | 2015-07-15 | 上海追日电气有限公司 | System for preventing distributed power generation system from reversing electric power to power grid and control method |
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2018
- 2018-08-14 CN CN201810922226.5A patent/CN108879797B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158229A (en) * | 2014-07-17 | 2014-11-19 | 浙江大学 | Secondary control method suitable for micro-grid system comprising various distributed power supplies |
| CN104779640A (en) * | 2015-04-15 | 2015-07-15 | 上海追日电气有限公司 | System for preventing distributed power generation system from reversing electric power to power grid and control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061526A (en) * | 2019-05-27 | 2019-07-26 | 浙江大学 | A kind of schedulable inverter droop control method |
| CN110829423A (en) * | 2019-11-18 | 2020-02-21 | 浙江大学 | Distributed power system stabilizer and method |
| CN112467799A (en) * | 2021-01-25 | 2021-03-09 | 国网江西省电力有限公司电力科学研究院 | Grid-connected control method and device for battery energy storage system |
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