CN109193819A - A kind of wind power plant reactive voltage hierarchical control method and system - Google Patents
A kind of wind power plant reactive voltage hierarchical control method and system Download PDFInfo
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- CN109193819A CN109193819A CN201811030388.4A CN201811030388A CN109193819A CN 109193819 A CN109193819 A CN 109193819A CN 201811030388 A CN201811030388 A CN 201811030388A CN 109193819 A CN109193819 A CN 109193819A
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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
- H02J3/50—Controlling the sharing of the out-of-phase component
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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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- H02J3/386—
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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 provides a kind of wind power plant reactive voltage hierarchical control method, comprising: the node that voltage fluctuation most serious is determined according to grid operation data and running of wind generating set data is control node；Using the virtual voltage of the control node, reference voltage and reactive power auxiliary service value, reactive power command value is determined；By the reactive power command value it is each collection electric line node between Wind turbines, same current collection line node each Wind turbines between and Wind turbines inner part match；Voltage adjusting is carried out based on the reactive power command value that each Wind turbines are assigned to.Technical solution provided by the invention can give full play to the reactive power support ability using double-fed unit, improve collection electric line and grid entry point Voltage Stability Level in wind power plant.
Description
Technical field
The invention belongs to wind power generation fields, and in particular to a kind of wind power plant reactive voltage hierarchical control method and system.
Background technique
Wind power plant, which focuses mostly on greatly, at present accesses the end of weak power grid, and reactive power/voltage control difficulty is larger.It is according to GB/T
So that wind power plant is made full use of the reactive capability and its regulating power of Wind turbines, is when the reactive capability of Wind turbines is not able to satisfy
When system voltage adjusting needs, the reactive power compensator of installation suitable capacity is usually concentrated in wind power plant.But overwhelming majority wind at present
Motor group is with rated power factor, for example, PF=1.0 is run, unit is idle, and pressure regulation ability is not utilized effectively.Wind power plant
That there are operational percentages is low for the dynamic reactive compensation device of installation, operational reliability is low, dynamic responding speed is slow, control strategy it is improper with
And dynamic reactive nargin it is insufficient the problems such as.
The basic Controlling principle of electric system is exactly the layering and zoning control for realizing voltage power-less, and this method on the one hand can
It is provided safeguard for system voltage quality, on the other hand can also enhance the economic performance of idle operation.It is controlled according to layering and zoning
And in-situ balancing principle, it can effectively guarantee quality of voltage and reasonable reactive management is carried out to voltage, make System Reactive Power
Active loss is reduced while being distributed more uniform, the contents such as high and low level of appropriateness and global voltage to voltage give
Control analysis.
When Wind turbines are double-fed fan motor unit, traditional wind power plant reactive voltage control strategy can be divided into idle adjusting layer
With idle Distribution Layer.By detection real-time data of power grid and reactive command value is calculated according to voltage control algolithm in adjusting layer；
The instruction value is assigned to every Wind turbines by certain principle by Distribution Layer.Traditional control strategy is concerned only with wind farm grid-connected point
Voltage condition, control object are more Wind turbines, and the reactive command between unit generally presses reactive capability algorithm or constant power
Factoring method is allocated, and does not consider the influence that Wind turbines spatial distribution differences distribute unit reactive power.Wind power plant stable state
When operation, each Wind turbines end voltage on same feeder line is successively reduced from tail end to head end, and as unit exports
The increase of power, the voltage difference between unit increase.
Summary of the invention
For the deficiency for solving above-mentioned technology, the present invention provides a kind of wind power plant reactive voltage hierarchical control method and system,
By detecting and calculating each node voltage inside wind power plant, nothing is carried out using the node of voltage fluctuation most serious as control node
Function adjusting；It takes between different nodes, is connected between the different Wind turbines of same node simultaneously, it is idle inside Wind turbines
Power distribution strategies maximally utilize enabling capabilities of the idle output to voltage of double-fed fan motor unit.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of wind power plant reactive voltage hierarchical control method, it is improved in that the described method includes:
The node that voltage fluctuation most serious is determined according to grid operation data and running of wind generating set data is control node；
Using the virtual voltage of the control node, reference voltage and reactive power auxiliary service value, determine that reactive power instructs
Value；
By the reactive power command value it is each collection electric line node between Wind turbines, same current collection line node
Each Wind turbines between and Wind turbines inner part match；
Voltage adjusting is carried out based on the reactive power command value that each Wind turbines are assigned to.
Preferably, described using the virtual voltage of the control node, reference voltage and reactive power auxiliary service value, determine nothing
Function power command value includes:
By the virtual voltage and reference voltage of control node, voltage deviation amount is calculated；
The voltage deviation amount inputs PI controller by dead zone function, controls to obtain reactive power instruction using clipping
Value.
Preferably, it is described by reactive command Distribution Layer by the reactive power command value it is each collection electric line node between
Wind turbines, same current collection line node each Wind turbines between and Wind turbines inner part with including:
According to the principle of trend sensitivity from high to low, the total reactive power of the Wind turbines of each current collection line node is calculated
Instruction value；
The total reactive power command value of Wind turbines based on each current collection line node is calculated in reactive capability ratio
The reactive power command value of each Wind turbines in current collection line node；
Based on the reactive power command value of each Wind turbines in the current collection line node, the nothing of stator side current transformer is calculated
Function power command value.
Preferably, the grid operation data includes: Wind turbines number, the route initial end voltage, wind turbine on route
The line impedance between power output value, node and node organized；
The running of wind generating set data include: the performance number of Wind turbines at node.
Preferably, the node voltage is calculated as follows:
In formula, Ui: the voltage at node i；U0: route initial end voltage；N: machine group #, Rn: transmission line of electricity resistance；Xn:
Transmission line of electricity reactance；Un: voltage rating；PLj: the active power of Wind turbines j；QLj: the reactive power of Wind turbines j；PWj: section
Wind turbines active power at point j；QWj: the Wind turbines reactive power at node j；Wherein i=1,2 ..., N, N are route
On Wind turbines number；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
Preferably, the trend sensitivity is calculated as follows:
In formula, Kj: the trend sensitivity of j-th strip collection electric line；Qj: the reactive power of every collection electric line；Uj: collection electric wire
The voltage of road j；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
Preferably, the total reactive power command value of the Wind turbines of the current collection line node is calculated as the following formula:
In formula, Qjref: the reactive power command value of j-th strip collection electric line；Kj: the trend sensitivity of j-th strip collection electric line；The sum of current collection Line Flow susceptibility in wind power plant；Qref: the total reactive power command value of wind power plant.
Preferably, the reactive power command value of each Wind turbines is calculated as the following formula in the current collection line node:
Qjqref=(Qqmax/Qtotalmax)Qjref
In formula, Qjqref: the reactive power instruction of the upper q platform Wind turbines of current collection line node j；QqmaxIt detours section for current collection
The reactive power auxiliary service of q platform Wind turbines, Q in pointtotalmaxIt is current collection around all participation Reactive-power controls of circuit node j connection
The sum of unit reactive power auxiliary service, QjrefFor the current collection reactive power command value total around the Wind turbines of circuit node j.
Preferably, the reactive power command value based on each Wind turbines in current collection line node calculates stator side and becomes
Stream device reactive power command value include:
The reactive power command value of each Wind turbines is allocated inside Wind turbines in the current collection line node, excellent
Stator side current transformer is first distributed to, sends reactive power command value from stator side current transformer to power grid；
When Wind turbines reactive power command value is more than stator side reactive power auxiliary service, the part exceeded is by net side unsteady flow
Device sends reactive power command value.
Preferably, the reactive power command value progress voltage being assigned to based on each Wind turbines, which is adjusted, includes:
The reactive power instruction of Wind turbines in current collection line node is calculated according to the reactive power command value of the distribution
The deviation of value and reactive power output actual value, and through overpower outer ring PI controller, obtain current instruction value；
The deviation of the current instruction value and current actual value is calculated according to the current instruction value, and passes through current inner loop
PI controller obtains voltage instruction value；
The deviation that voltage instruction value and voltage compensation item are calculated according to the voltage instruction value, after Parker coordinate transform
Pulse width modulation is carried out, reactive power instruction input stator side current transformer and grid-side converter are generated, thus regulating wind power machine
The voltage of group.
A kind of wind power plant reactive voltage hierarchy system, the system comprises: control destination layer, idle adjusting layer, nothing
Function instructs Distribution Layer and wind generation set control strategy layer；
Control destination layer: for determining voltage fluctuation most serious according to grid operation data and running of wind generating set data
Node is control node；
Idle adjusting layer: for virtual voltage, reference voltage and the reactive power auxiliary service value using the control node, really
Determine reactive power command value；
Reactive command Distribution Layer: for the wind turbine by the reactive power command value between the node of each collection electric line
Group, same current collection line node each Wind turbines between and Wind turbines inner part match；
Wind generation set control strategy layer: the reactive power command value for being assigned to based on each Wind turbines carries out voltage tune
Section.
Preferably, the reactive command layer includes the first allocation unit, the second allocation unit, third allocation unit；
First allocation unit: for the principle according to trend sensitivity from high to low, the wind of each current collection line node is calculated
The total reactive power command value of motor group；
Second allocation unit: the reactive power command value total for the Wind turbines based on each current collection line node,
The reactive power command value of each Wind turbines in current collection line node is calculated in reactive capability ratio；
Third allocation unit: for the reactive power command value based on each Wind turbines in the current collection line node, meter
Calculate the reactive power command value of stator side current transformer.
With immediate prior art ratio, technical solution provided by the invention has following excellent effect:
Wind power plant reactive voltage hierarchical control method provided by the invention and system, are no longer limited to the electricity of single grid entry point
Voltage-controlled system, but idle adjusting is carried out using the node of voltage fluctuation most serious as control node, it has fully considered in wind power plant
The voltage condition for collecting each node of electric line, expands control reference voltage, enhances control effect；And reactive power is existed
It between different nodes, is connected between the different Wind turbines of same node, is allocated on three levels inside Wind turbines, most
Bigization, to the enabling capabilities of voltage, it is poor to reduce each unit set end voltage in wind power plant using the idle output of double-fed fan motor unit
It is different, improve running of wind generating set safety.
Wind power plant reactive voltage hierarchical control method provided by the invention and system, it is easy to accomplish, strong operability.
Detailed description of the invention
Fig. 1 is wind power plant reactive voltage hierarchical control method provided by the invention；
Fig. 2 is typical emanant wind power plant collector system structure；
Fig. 3 is wind power plant typical case collector system network；
Fig. 4 is idle adjusting layer control schematic diagram provided by the invention；
Fig. 5 is that the reactive power of wind reactive command provided by the invention layering distributes schematic diagram；
Fig. 6 provides the Reactive Power Control schematic diagram of ground wind generation set control strategy layer for the present invention；
Fig. 7 is double-fed fan motor unit power relation figure；
Fig. 8 is double-fed fan motor unit reactive power auxiliary service；
Fig. 9 is the wind farm grid-connected voltage change song controlled using traditional control method and the method for the invention
Line comparison diagram；
Figure 10 is wind power plant reactive voltage hierarchy system provided by the invention.
Specific embodiment
Be described below and in conjunction with attached drawing provide specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Technical staff can be proposed under the enlightenment of the embodiment of the present invention other include structure, logic, it is electrical
, process and the other technical solution changed.
Embodiment one,
The present invention provides a kind of wind power plant reactive voltage hierarchical control method, as shown in Figure 1, which comprises
Step 1: determining the node of voltage fluctuation most serious for control according to grid operation data and running of wind generating set data
Node processed；
Step 2: using virtual voltage, reference voltage and the reactive power auxiliary service value of the control node, determining idle function
Rate instruction value；
Step 3: by Wind turbines, same collection electric wire of the reactive power command value between the node of each collection electric line
Between each Wind turbines of circuit node and Wind turbines inner part is matched；
Step 4: voltage adjusting is carried out based on the reactive power command value that each Wind turbines are assigned to.
Wind power plant typical case's collector system network, as shown in Fig. 2, the Wind turbines typical case of collection electric line radiates in wind power plant
Net, as shown in figure 3, there is N platform Wind turbines in collection electric line, the power output of each unit is PLi+jQLi, i=1,2 ...,
N, route initial end voltage are U0, node i voltage is Ui, the line impedance between node i and node i -1 is Ri+jXi。
Step 1: determining the node of voltage fluctuation most serious for control according to grid operation data and running of wind generating set data
Node processed；
Specifically, the grid operation data includes: Wind turbines number, the route initial end voltage, wind turbine on route
The line impedance between power output value, node and node organized；
The running of wind generating set data include: the performance number of Wind turbines at node.
Specifically, the electric network data and Wind turbines data computational node voltage that the basis obtains in advance, are counted as the following formula
It calculates:
In formula, Ui: the voltage at node i；U0: route initial end voltage；N: machine group #, Rn: transmission line of electricity resistance；Xn:
Transmission line of electricity reactance；Un: voltage rating；PLj: the active power of Wind turbines j；QLj: the reactive power of Wind turbines j；PWj: section
Wind turbines active power at point j；QWj: the Wind turbines reactive power at node j；Wherein i=1,2 ..., N；N is route
On Wind turbines number；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
Step 2: using virtual voltage, reference voltage and the reactive power auxiliary service value of the control node, determining idle function
Rate instruction value, as shown in Figure 4, comprising:
By the virtual voltage and reference voltage of control node, voltage deviation amount is calculated；
The voltage deviation amount inputs PI controller by dead zone function, controls using clipping, obtains reactive power and refer to
Enable value.
Step 3: by the reactive power command value between each collection electric line, each wind turbine of same current collection line node
Between group and Wind turbines inner part is matched, as shown in Figure 5, comprising:
According to the principle of trend sensitivity from high to low, the total reactive power of the Wind turbines of each current collection line node is calculated
Instruction value；
The total reactive power command value of Wind turbines based on each current collection line node is calculated in reactive capability ratio
The reactive power command value of each Wind turbines in current collection line node；
Based on the reactive power command value of each Wind turbines in the current collection line node, the nothing of stator side current transformer is calculated
Function power command value.
Specifically, the trend sensitivity is calculated as follows:
In formula, Kj: the trend sensitivity of j-th strip collection electric line；Qj: the reactive power of every collection electric line；Uj: collection electric wire
The voltage of road j；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
Specifically, the total reactive power command value of the Wind turbines of the current collection line node is calculated as the following formula:
In formula, Qjref: the reactive power command value of j-th strip collection electric line；Kj: the trend sensitivity of j-th strip collection electric line；The sum of current collection Line Flow susceptibility in wind power plant；Qref: the total reactive power command value of wind power plant.
Specifically, the reactive power command value of each Wind turbines is calculated as the following formula in the current collection line node:
Qjqref=(Qqmax/Qtotalmax)Qjref
In formula, Qjqref: the reactive power instruction of the upper q platform Wind turbines of current collection line node j；QqmaxIt detours section for current collection
The reactive power auxiliary service of q platform Wind turbines, Q in pointtotalmaxIt is current collection around all participation Reactive-power controls of circuit node j connection
The sum of unit reactive power auxiliary service, QjrefFor the current collection reactive power command value total around the Wind turbines of circuit node j.
Specifically, the reactive power command value based on each Wind turbines in current collection line node calculates stator side and becomes
Stream device reactive power command value include:
The reactive power command value of each Wind turbines is allocated inside Wind turbines in the current collection line node, excellent
Stator side current transformer is first distributed to, sends reactive power command value from stator side current transformer to power grid；
When Wind turbines reactive power command value is more than stator side reactive power auxiliary service, the part exceeded is by net side unsteady flow
Device sends reactive power command value.
Step 4: voltage adjusting being carried out based on the reactive power command value that each Wind turbines are assigned to, as shown in fig. 6, packet
It includes:
The reactive power instruction of Wind turbines in current collection line node is calculated according to the reactive power command value of the distribution
The deviation of value and reactive power output actual value, and through overpower outer ring PI controller, obtain current instruction value；
The deviation of the current instruction value and current actual value is calculated according to the current instruction value, and passes through current inner loop
PI controller obtains voltage instruction value；
The deviation that voltage instruction value and voltage compensation item are calculated according to the voltage instruction value, after Parker coordinate transform
Pulse width modulation is carried out, reactive power instruction input stator side current transformer and grid-side converter are generated, thus regulating wind power machine
The voltage of group.
In addition, Wind turbines output reactive power is limited by its reactive power auxiliary service, doubly fed machine group grid-side converter and
Double-fed generator (DFIG) stator side can convey active and reactive power to power grid, as shown in Figure 7.In figure, PsFor generator unit
The active power of side output, QsThe reactive power of generator unit side output, Pg: it conveys for entire electricity generation system to power grid active
Power, QgFor the reactive power that entire electricity generation system is conveyed to power grid, PrFor the active power of double-fed unit rotor side output, Qr
For the reactive power of double-fed unit rotor side output；PcFor the active power of grid-side converter output, QcFor grid-side converter output
Reactive power.
Consider that capacity limit obtains its reactive power range and is shown below:
In formula, Sc: the rated capacity of grid-side converter；PcFor the active power of grid-side converter output, QcFor net side unsteady flow
The reactive power of device output.
Ignore current transformer active loss, double-fed unit Pc=sPs, wherein s is revolutional slip.Unit grid-side converter it is idle
Power limit is calculated as the following formula:
In formula, Qcmax: grid-side converter reactive power maximum value；Qcmin: grid-side converter reactive power minimum value；PsFor
The active power of generator unit side output；QsThe reactive power of generator unit side output.
Double-fed set generator stator side can also to power grid convey reactive power, Power operation range by stator around
The current limit of group, rotor windings and generator-side converter wear influences, but play a major role be generator-side converter wear current limit, it is fixed
The range of sub- reactive power is calculated as the following formula:
In formula, Qsmax: the maximum value of doubly-fed generation machine stator reactive power；QsminRespectively doubly-fed generation machine stator is idle
Maximum value, the minimum value of power；UgFor network voltage vector magnitude；XmFor excitation reactance；XsFor stator reactance；IrmaxFor pusher side
The current limit of current transformer.
Double-fed fan motor unit is calculated as follows to the reactive power auxiliary service that power grid issues:
Qmax=Qsmax+Qcmax,Qmin=Qsmin+Qcmin (8)
Attached drawing 8 is the idle output area of double-fed unit, and double-fed fan motor unit Reactive-power control ability can increase with active power
And reduce, the idle output of unit, which includes that stator side output is idle, exports idle two parts with grid-side converter.
Fig. 9 is the wind farm grid-connected voltage change song controlled using traditional control method and the method for the invention
Line comparison diagram can be seen that from the waveform in figure using wind farm grid-connected after reactive voltage hierarchical control method of the present invention
Point Voltage Stability Level has very big promotion.
Embodiment two,
The present invention also provides a kind of wind power plant reactive voltage hierarchy systems, as shown in Figure 10, the system comprises: control
Destination layer, idle adjusting layer, reactive command Distribution Layer and wind generation set control strategy layer processed；
Control destination layer: for determining voltage fluctuation most serious according to grid operation data and running of wind generating set data
Node is control node；
Idle adjusting layer: for virtual voltage, reference voltage and the reactive power auxiliary service value using the control node, really
Determine reactive power command value；
Reactive command Distribution Layer: for the wind turbine by the reactive power command value between the node of each collection electric line
Group, same current collection line node each Wind turbines between and Wind turbines inner part match；
Wind generation set control strategy layer: the reactive power command value for being assigned to based on each Wind turbines carries out voltage tune
Section.
Specifically, it when controlling destination layer calculate node voltage, is calculated as follows:
In formula, Ui: the voltage at node i；U0: route initial end voltage；N: machine group #, Rn: transmission line of electricity resistance；Xn:
Transmission line of electricity reactance；Un: voltage rating；PLj: the active power of Wind turbines j；QLj: the reactive power of Wind turbines j；PWj: section
Wind turbines active power at point j；QWj: the Wind turbines reactive power at node j；Wherein i=1,2 ..., N；N is route
On Wind turbines number；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
Specifically, it is inclined to calculate voltage for idle adjusting virtual voltage and reference voltage of the layer by fixed control node
Residual quantity is then passed through dead zone function input PI controller, controls to obtain reactive power command value using clipping.
Specifically, the reactive command Distribution Layer includes the first allocation unit, the second allocation unit, third allocation unit；
First allocation unit: for the principle according to trend sensitivity from high to low, the wind of each current collection line node is calculated
The total reactive power command value of motor group；
Second allocation unit: the reactive power command value total for the Wind turbines based on each current collection line node,
The reactive power command value of each Wind turbines in current collection line node is calculated in reactive capability ratio；
Third allocation unit: for the reactive power command value based on each Wind turbines in the current collection line node, meter
Calculate the reactive power command value of stator side current transformer.
Wherein, trend sensitivity is calculated as follows in the first allocation unit:
In formula, Kj: the trend sensitivity of j-th strip collection electric line；Qj: the reactive power of every collection electric line；Uj: collection electric wire
The voltage of road j；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
Specifically, the total reactive power command value of the Wind turbines of the current collection line node is calculated as the following formula:
In formula, Qjref: the reactive power command value of j-th strip collection electric line；Kj: the trend sensitivity of j-th strip collection electric line；The sum of current collection Line Flow susceptibility in wind power plant；Qref: the total reactive power command value of wind power plant.
The reactive power command value of each Wind turbines in current collection line node is calculated as follows in second allocation unit:
Qjqref=(Qqmax/Qtotalmax)Qjref
In formula, Qjqref: the reactive power instruction of the upper q platform Wind turbines of current collection line node j；QqmaxIt detours section for current collection
The reactive power auxiliary service of q platform Wind turbines, Q in pointtotalmaxIt is current collection around all participation Reactive-power controls of circuit node j connection
The sum of unit reactive power auxiliary service, QjrefFor the current collection reactive power command value total around the Wind turbines of circuit node j.
Reactive power command value of the third allocation unit based on each Wind turbines in current collection line node calculates stator side and becomes
Stream device reactive power command value include:
The reactive power command value of each Wind turbines is allocated inside Wind turbines in the current collection line node, excellent
Stator side current transformer is first distributed to, sends reactive power command value from stator side current transformer to power grid；
When Wind turbines reactive power command value is more than stator side reactive power auxiliary service, the part exceeded is by net side unsteady flow
Device sends reactive power command value.
Specifically, wind generation set control strategy layer carries out voltage based on the reactive power command value that each Wind turbines are assigned to
It adjusts, comprising:
The deviation of reactive power command value and reactive power the output actual value of Wind turbines in current collection line node is calculated,
And through overpower outer ring PI controller, current instruction value is obtained；
The deviation of the current instruction value and current actual value is calculated, and obtains voltage by current inner loop PI controller and refers to
Enable value；
The deviation for calculating voltage instruction value and voltage compensation item carries out pulse width modulation after Parker coordinate transform,
Reactive power instruction input stator side current transformer and grid-side converter are generated, thus the voltage of regulating wind power unit.
Fact explanation, the present embodiment wind power plant reactive voltage hierarchical control method and system, with voltage fluctuation most serious
Node carries out idle adjusting as control node, expands control reference voltage, enhances control effect.
The wind power plant reactive voltage hierarchical control method and system of the present embodiment, reactive power connect between different nodes
Between the different Wind turbines of same node, it is allocated on three levels inside Wind turbines, maximally utilizes double-fed wind
The idle output of motor group reduces each unit set end voltage difference in wind power plant to the enabling capabilities of voltage, improves wind turbine
Group safety in operation.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into
Row modification perhaps equivalent replacement these without departing from any modification of spirit and scope of the invention or equivalent replacement, applying
Within pending claims of the invention.
Claims (12)
1. a kind of wind power plant reactive voltage hierarchical control method, which is characterized in that the described method includes:
The node that voltage fluctuation most serious is determined according to grid operation data and running of wind generating set data is control node；
Using the virtual voltage of the control node, reference voltage and reactive power auxiliary service value, reactive power command value is determined；
By the reactive power command value it is each collection electric line node between Wind turbines, same current collection line node it is each
Between Wind turbines and Wind turbines inner part is matched；
Voltage adjusting is carried out based on the reactive power command value that each Wind turbines are assigned to.
2. method as described in claim 1, which is characterized in that the virtual voltage using the control node, reference voltage
With reactive power auxiliary service value, determine that reactive power command value includes:
By the virtual voltage and reference voltage of control node, voltage deviation amount is calculated；
The voltage deviation amount inputs PI controller by dead zone function, controls to obtain reactive power command value using clipping.
3. method as described in claim 1, which is characterized in that it is described by reactive command Distribution Layer by the reactive power command value
It is each collection electric line node between Wind turbines, same current collection line node each Wind turbines between and Wind turbines
Inner part is matched
According to the principle of trend sensitivity from high to low, the total reactive power instruction of the Wind turbines of each current collection line node is calculated
Value；
The total reactive power command value of Wind turbines based on each current collection line node calculates current collection in reactive capability ratio
The reactive power command value of each Wind turbines in line node；
Based on the reactive power command value of each Wind turbines in the current collection line node, the idle function of stator side current transformer is calculated
Rate instruction value.
4. method as described in claim 1, which is characterized in that the grid operation data include: Wind turbines number on route,
Line impedance between route initial end voltage, the power output value of Wind turbines, node and node；
The running of wind generating set data include: the performance number of Wind turbines at node.
5. method as claimed in claim 2, which is characterized in that the node voltage is calculated as follows:
In formula, Ui: the voltage at node i；U0: route initial end voltage；N: machine group #, Rn: transmission line of electricity resistance；Xn: transmission of electricity
Line reactance；Un: voltage rating；PLj: the active power of Wind turbines j；QLj: the reactive power of Wind turbines j；PWj: node j
The Wind turbines active power at place；QWj: the Wind turbines reactive power at node j；Wherein i=1,2 ..., N, N are on route
Wind turbines number；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
6. method as claimed in claim 3, which is characterized in that the trend sensitivity is calculated as follows:
In formula, Kj: the trend sensitivity of j-th strip collection electric line；Qj: the reactive power of every collection electric line；Uj: collection electric line j's
Voltage；J=1,2 ..., M；M is the current collection number of lines in wind power plant.
7. method as claimed in claim 6, which is characterized in that the reactive power that the Wind turbines of the current collection line node are total refers to
Value is enabled to be calculated as the following formula:
In formula, Qjref: the reactive power command value of j-th strip collection electric line；Kj: the trend sensitivity of j-th strip collection electric line；The sum of current collection Line Flow susceptibility in wind power plant；Qref: the total reactive power command value of wind power plant.
8. method as claimed in claim 6, which is characterized in that the reactive power of each Wind turbines refers in the current collection line node
Value is enabled to be calculated as the following formula:
Qjqref=(Qqmax/Qtotalmax)Qjref
In formula, Qjqref: the reactive power instruction of the upper q platform Wind turbines of current collection line node j；QqmaxIt is current collection in circuit node
The reactive power auxiliary service of q platform Wind turbines, QtotalmaxIt is current collection around the unit of all participation Reactive-power controls of circuit node j connection
The sum of reactive power auxiliary service, QjrefFor the current collection reactive power command value total around the Wind turbines of circuit node j.
9. method as claimed in claim 3, which is characterized in that it is described based in current collection line node each Wind turbines it is idle
Power command value, the reactive power command value for calculating stator side current transformer include:
The reactive power command value of each Wind turbines is allocated inside Wind turbines in the current collection line node, and preferential point
Dispensing stator side current transformer sends reactive power command value from stator side current transformer to power grid；
When Wind turbines reactive power command value is more than stator side reactive power auxiliary service, the part exceeded is sent out by grid-side converter
Send reactive power command value.
10. method as described in claim 1, which is characterized in that the reactive power instruction being assigned to based on each Wind turbines
Value carries out voltage adjusting
According to the reactive power command value of the distribution calculate current collection line node on Wind turbines reactive power command value with
Reactive power exports the deviation of actual value, and through overpower outer ring PI controller, obtains current instruction value；
The deviation of the current instruction value and current actual value is calculated according to the current instruction value, and is controlled by current inner loop PI
Device processed obtains voltage instruction value；
The deviation that voltage instruction value and voltage compensation item are calculated according to the voltage instruction value, carries out after Parker coordinate transform
Pulse width modulation, generates reactive power instruction input stator side current transformer and grid-side converter, thus regulating wind power unit
Voltage.
11. a kind of wind power plant reactive voltage hierarchy system, which is characterized in that the system comprises: control destination layer, idle
Adjust layer, reactive command Distribution Layer and wind generation set control strategy layer；
Control destination layer: for determining the node of voltage fluctuation most serious according to grid operation data and running of wind generating set data
For control node；
Idle adjusting layer: for virtual voltage, reference voltage and the reactive power auxiliary service value using the control node, nothing is determined
Function power command value；
Reactive command Distribution Layer: for by the reactive power command value it is each collection electric line node between Wind turbines,
Between each Wind turbines of same current collection line node and Wind turbines inner part is matched；
Wind generation set control strategy layer: the reactive power command value for being assigned to based on each Wind turbines carries out voltage adjusting.
12. method as claimed in claim 11, which is characterized in that the reactive command Distribution Layer includes the first allocation unit, the
Two allocation units, third allocation unit；
First allocation unit: for the principle according to trend sensitivity from high to low, the wind turbine of each current collection line node is calculated
The total reactive power command value of group；
Second allocation unit: the reactive power command value total for the Wind turbines based on each current collection line node, by nothing
Function capacity ratio calculates the reactive power command value of each Wind turbines in current collection line node；
Third allocation unit: for the reactive power command value based on each Wind turbines in the current collection line node, it is fixed to calculate
The reactive power command value of sub- side current transformer.
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