CN109599897A - A kind of power-less compensation control method considering offshore wind farm fluctuation - Google Patents
A kind of power-less compensation control method considering offshore wind farm fluctuation Download PDFInfo
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- CN109599897A CN109599897A CN201811508409.9A CN201811508409A CN109599897A CN 109599897 A CN109599897 A CN 109599897A CN 201811508409 A CN201811508409 A CN 201811508409A CN 109599897 A CN109599897 A CN 109599897A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000035945 sensitivity Effects 0.000 claims abstract description 26
- 230000010354 integration Effects 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
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Classifications
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- H02J3/386—
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The present invention relates to a kind of power-less compensation control methods for considering offshore wind farm fluctuation.The fluctuation of meter and offshore wind farm access system, according to network structure and real-time system information, it sets out to obtain power-less compensation control method to improve the voltage stability of system, include: step S1, by multiport Thevenin's equivalence that known wind power integration system is equivalent at bi-nodal system, calculates the unstable index of each node voltage in wind power integration system；Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and calculates voltage stability key node control target；Step S3, the control sensitivity for the control of reactive power compensating node to voltage stability key place selects n node of high sensitivity as reactive compensation place；Step S4, using the corresponding control amount of control each control node of Calculation of Sensitivity, implement control to improve voltage stability.The present invention can be to prevent wind power integration system voltage unstability from carrying out the control of reactive power compensating as target.
Description
Technical field
The invention belongs to technical field of power systems, and in particular to a kind of reactive compensation control for considering offshore wind farm fluctuation
Method processed.
Background technique
In the electric system of current wind power integration, the method for mainly taking time-domain-simulation obtains control strategy, however offline
The validity of Simulation Control effect depends on the accuracy and Trouble Match degree of model.And for wind power integration system, by
Changing its operation conditions and its parameter constantly in wind electricity volatility, offline decision-premaking can not adapt to.When the control of reactive power compensating
A kind of control method being effectively improved voltage stability can improve system voltage stability in the case where not influencing load.Cause
This, needs to design a kind of power-less compensation control method for considering offshore wind farm fluctuation, and Lai Gaishan wind power integration system voltage is steady
It is qualitative, Voltage Instability is prevented, this electric system that wind-powered electricity generation permeability is continuously improved is of great significance.
The present invention principle equivalent using multiport Dai Weinan, surveys the network information and voltage magnitude according to system, calculates
The sensitivity index R of reflecting voltage stability key node and control node close relation degreeji, select to control by sensitivity
Place simultaneously calculates control amount, obtains the power-less compensation control method of anti-Voltage Instability.
Summary of the invention
The purpose of the present invention is to provide a kind of power-less compensation control method for considering offshore wind farm fluctuation, this method roots
According to network structure and real-time system information, to prevent wind power integration system voltage unstability from carrying out the control of reactive power compensating as target.
To achieve the above object, the technical scheme is that a kind of reactive compensation control for considering offshore wind farm fluctuation
Method processed, the fluctuation of meter and offshore wind farm access system, according to network structure and real-time system information, to improve the electricity of system
Pressure stability sets out to obtain power-less compensation control method, includes the following steps:
Step S1, by multiport Thevenin's equivalence that known wind power integration system is equivalent at bi-nodal system, calculate wind
The unstable index Ivsi of each node voltage being electrically accessed in system；
Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and
It calculates voltage stability key node and controls target；
Step S3, the control sensitivity for the control of reactive power compensating node to voltage stability key place selects sensitive
N high node is spent as reactive compensation place；
Step S4, using the corresponding control amount of control each control node of Calculation of Sensitivity, implement control to improve voltage stabilization
Property.
In an embodiment of the present invention, the step S1, specifically: known wind power integration system utilizes Thevenin's equivalence
System is equivalent at two node power grids, and wherein wind-electricity integration point is considered as power supply node, no adjusting energy if still having regulating power
Power is then considered as load bus；The unstable index Ivsi of each node voltage is calculated with this.
In an embodiment of the present invention, the step S3, specifically: the control of reactive power compensating node j can be carried out for given,
It calculates and reflects its control sensitivity index between voltage stability key node i:
Wherein, ZeqiFor node i system side equivalent impedance；ZLL(ij)For the mutual impedance of node j and node i；For node i fortune
Voltage phasor when row,Voltage phasor when being run for node j；
To control sensitivity as foundation, n sensitivity great thing is selected to control place.
In an embodiment of the present invention, the step S4, specifically: mesh is calculated using the unstable index Ivsi of node voltage
Control amount is marked, is averagely allocated to n reactive compensation place, then the control target of each control node are as follows:
Wherein, Ivsi,i,preThe spread of voltage index of current dangerous node, Ivsi,tarFor the unstable index of target voltage；
Using the control sensitivity of control node j, control amount needed for reaching control target is calculated:
Wherein, Δ QjFor the control amount for calculating gained control node j, voltage instability can be enabled by carrying out the control of reactive power compensating with this
Determine index and reaches target call.
Compared to the prior art, the invention has the following advantages: present invention only requires the impedances for knowing partial electric grid
Information and node voltage amplitude can obtain the power-less compensation control method of offshore wind farm access system；Compared to existing method,
It is i.e. simple and quick, in real time effectively, and can sufficiently count and wind electricity volatility, to improve wind power integration system voltage stability.
Detailed description of the invention
Fig. 1 is sample calculation IEEE14 node diagram.
Fig. 2 is two impedance of node i, two node power grid.
Fig. 3 is the power-less compensation control method flow chart of offshore wind farm access system.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of power-less compensation control method for considering offshore wind farm fluctuation, meter and offshore wind farm access
The fluctuation of system sets out to obtain nothing according to network structure and real-time system information to improve the voltage stability of system
Function compensating control method, includes the following steps:
Step S1, by multiport Thevenin's equivalence that known wind power integration system is equivalent at bi-nodal system, calculate wind
The unstable index Ivsi of each node voltage being electrically accessed in system；
Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and
It calculates voltage stability key node and controls target；
Step S3, the control sensitivity for the control of reactive power compensating node to voltage stability key place selects sensitive
N high node is spent as reactive compensation place；
Step S4, using the corresponding control amount of control each control node of Calculation of Sensitivity, implement control to improve voltage stabilization
Property.
The step S1, specifically: known wind power integration system, it is using Thevenin's equivalence that system is equivalent at two nodes electricity
Net, wherein wind-electricity integration point is considered as power supply node if still having regulating power, and no regulating power is considered as load bus；With this
Calculate the unstable index Ivsi of each node voltage.
The step S3, specifically: the control of reactive power compensating node j can be carried out for given, calculating reflection, it is steady with voltage
Control sensitivity index between qualitative key node i:
Wherein, ZeqiFor node i system side equivalent impedance；ZLL(ij)For the mutual impedance of node j and node i；For node i fortune
Voltage phasor when row,Voltage phasor when being run for node j；
To control sensitivity as foundation, n sensitivity great thing is selected to control place.
The step S4, specifically: target control amount is calculated using the unstable index Ivsi of node voltage, is averagely allocated to
N reactive compensation place, then the control target of each control node are as follows:
Wherein, Ivsi,i,preThe spread of voltage index of current dangerous node, Ivsi,tarFor the unstable index of target voltage；
Using the control sensitivity of control node j, control amount needed for reaching control target is calculated:
Wherein, Δ QjFor the control amount for calculating gained control node j, voltage instability can be enabled by carrying out the control of reactive power compensating with this
Determine index and reaches target call.
The following are specific implementation processes of the invention.
The method of the present invention calculated examples select IEEE14 node system (as shown in Figure 1).Node 8 is wind power integration node,
Under a certain operating status, calculating spread of voltage index and can obtaining node 14 is system voltage stability key node, works as progress
When the control of reactive power compensating, the control of reactive power compensating place is considered as to the control effect of voltage stability key node, is to reach
Voltage stability of uniting requires.
Step 1: complex electric network is equivalent at two impedance of node i, two node power grid, and node 8 is considered as by Thevenin's equivalence
Power supply node.Its result is as shown in Fig. 2, to calculate the unstable index of each node voltage as shown in table 1:
The 1 unstable index of each node voltage of table
Whether meet voltage stability condition using Ivsi=0.5 as each node voltage of judgement, then the Ivsi=of node 14
0.658181 does not meet voltage stability requirement, carries out the control of reactive power compensating with this.
Step 2: calculating the control of reflecting voltage stability key node and each the control of reactive power compensating place place substantial connection
Sensitivity R processedji, the results are shown in Table 2.
S index of each the control of reactive power compensating node of table 2 to node 14
Step 3: calculating each control node to spread of voltage index using node 9,14 as candidate compensation buses
Target control amount:
Step 4: being obtained respectively using 9,14 nodes as the control of reactive power compensating place according to the control Calculation of Sensitivity of each node
The control of reactive power compensating amount of a node are as follows:
Control amount is calculated with this and implements control, implements the reactive compensation of 0.3788p.u. on node 9, is implemented in node 14
The reactive compensation of 0.0964p.u., to guarantee system voltage stability.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (4)
1. a kind of power-less compensation control method for considering offshore wind farm fluctuation, which is characterized in that meter and offshore wind farm access system
The fluctuation of system is set out with improving the voltage stability of system to obtain idle according to network structure and real-time system information
Compensating control method includes the following steps:
Step S1, by multiport Thevenin's equivalence that known wind power integration system is equivalent at bi-nodal system, it calculates wind-powered electricity generation and connects
Enter the unstable index Ivsi of each node voltage in system；
Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and is calculated
Voltage stability key node controls target；
Step S3, the control sensitivity for the control of reactive power compensating node to voltage stability key place selects high sensitivity
N node as reactive compensation place；
Step S4, using the corresponding control amount of control each control node of Calculation of Sensitivity, implement control to improve voltage stability.
2. a kind of power-less compensation control method for considering offshore wind farm fluctuation according to claim 1, which is characterized in that
The step S1, specifically: known wind power integration system, it is using Thevenin's equivalence that system is equivalent at two node power grids, wherein
Wind-electricity integration point is considered as power supply node if still having regulating power, and no regulating power is considered as load bus；It is calculated respectively with this
The unstable index Ivsi of node voltage.
3. a kind of power-less compensation control method for considering offshore wind farm fluctuation according to claim 1, which is characterized in that
The step S3, specifically: the control of reactive power compensating node j can be carried out for given, calculating reflection, it is crucial with voltage stability
Control sensitivity index between node i:
Wherein, ZeqiFor node i system side equivalent impedance；ZLL(ij)For the mutual impedance of node j and node i；When being run for node i
Voltage phasor,Voltage phasor when being run for node j；
To control sensitivity as foundation, n sensitivity great thing is selected to control place.
4. a kind of power-less compensation control method for considering offshore wind farm fluctuation according to claim 1, which is characterized in that
The step S4, specifically: target control amount is calculated using the unstable index Ivsi of node voltage, it is a idle to be averagely allocated to n
Place is compensated, then the control target of each control node are as follows:
Wherein, Ivsi,i,preThe spread of voltage index of current dangerous node, Ivsi,tarFor the unstable index of target voltage；
Using the control sensitivity of control node j, control amount needed for reaching control target is calculated:
Wherein, Δ QjFor the control amount for calculating gained control node j, carrying out the control of reactive power compensating with this can enable spread of voltage refer to
Mark reaches target call.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110912164A (en) * | 2019-12-13 | 2020-03-24 | 国网福建省电力有限公司 | Green energy island energy storage capacity configuration method considering voltage stability |
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