CN107017652A - Current conversion station steady-state operation interval method when wind-powered electricity generation cluster isolated network accesses soft straight power network - Google Patents

Current conversion station steady-state operation interval method when wind-powered electricity generation cluster isolated network accesses soft straight power network Download PDF

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CN107017652A
CN107017652A CN201710361383.9A CN201710361383A CN107017652A CN 107017652 A CN107017652 A CN 107017652A CN 201710361383 A CN201710361383 A CN 201710361383A CN 107017652 A CN107017652 A CN 107017652A
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power
voltage
current conversion
conversion station
wind
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刘莹
王泽忠
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North China Electric Power University
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North China Electric Power University
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Current conversion station steady-state operation interval method when accessing soft straight power network the invention discloses wind-powered electricity generation cluster isolated network, power electronic devices can be turned off based on voltage source converter type direct current transportation use, possesses the ability powered to passive network, voltage source converter is powered the application for including two importances to passive network, is pure to be powered to passive network on one side, such as powered by flexible DC power transmission to downtown area, or by flexible DC power transmission to passive island power supply etc.；Second aspect is that wind-powered electricity generation cluster accesses power network by flexible DC power transmission, and wind farm side is equal to passive network, it is necessary to which voltage source converter, which is wind power plant, sets up synchro source in this case, and otherwise wind power plant can not inherently be run.Current conversion station steady-state operation interval method when the sending end that the present invention is studied is wind-powered electricity generation cluster, reactive voltage operation characteristic when accessing passive power network to research sending end current conversion station has great importance.

Description

Current conversion station steady-state operation interval method when wind-powered electricity generation cluster isolated network accesses soft straight power network
Technical field
Current conversion station steady-state operation interval method when accessing soft straight power network the present invention relates to wind-powered electricity generation cluster isolated network, belongs to voltage source Converter type direct current transmission technical field.
Background technology
Based on voltage source converter type direct current transportation (voltage source converter based high Voltage direct current, VSC-HVDC) use can turn off power electronic devices, and this change of current device is can both to control System conducting can control the two-way controllable power electronic devices of shut-off again, it is not necessary to just can be realized from commutation using external power source, Therefore possesses the ability powered to passive network.Voltage source converter to passive network power comprising two importances should With, be on one side it is pure powered to passive network, such as powered by flexible DC power transmission to downtown area, or By flexible DC power transmission to passive island power supply etc.；Second aspect is that wind-powered electricity generation cluster accesses electricity by flexible DC power transmission Net, in this case wind farm side be equal to passive network, it is necessary to voltage source converter be wind power plant set up synchro source, it is no Then wind power plant can not inherently be run.
Voltage source converter based on turn-off device uses PWM control modes, and its modulation ratio distinguishes shadow with phase shifting angle Reactive power and active power that current conversion station absorbs or sent are rung, wherein modulation ratio is expressed as AC phase voltage and DC voltage The ratio between, phase shifting angle is defined as the angle between system generator output voltage and flexible direct current transmission converter station terminal voltage.By right The regulation of the two variables can realize the independent control of system active power and reactive power.When being connected with active electric network, The control mode of voltage source converter can be respectively combined by the control of active class and the control of idle class in VSC-HVDC, can be constituted Multiple control modes, wherein the control of active class includes：AC active power controller, AC FREQUENCY CONTROL, DC side direct current Voltage is controlled；Idle class control includes：AC Reactive Power Control, exchange side bus voltage control.Work as flexible DC power transmission When system is connected with passive network, the control mode of its voltage source converter station, which is only, determines the control of ac bus voltage, He Dingjiao Flow FREQUENCY CONTROL.By the grid-connected wind-powered electricity generation cluster of flexible DC power transmission, provided surely for wind-powered electricity generation cluster exit point by sending end current conversion station Fixed alternating voltage and frequency, therefore the voltage stabilization of grid entry point depends on the dynamic reactive power of voltage source converter station to adjust, So in actual applications, flexible direct current power transmission system permission voltage range according to the compensating proportion of reactive power, use The slope adjustment mode for having difference carries out grid entry point reactive power/voltage control.Similarly, active power and frequency control also uses slop control strategy, By pull-in frequency slop control characteristic, make flexible DC power transmission sending end station suitably sized entering according to Power Output for Wind Power Field Row active power controller, so as to control the frequency of grid connected wind power system.
The content of the invention
Current conversion station steady-state operation when the present invention accesses soft straight power network for existing technical problem there is provided wind-powered electricity generation cluster isolated network Interval method, it is therefore an objective to which reactive voltage operation characteristic when accessing passive power network to research sending end current conversion station has important meaning Justice, intends to solve the problem of prior art is present.
To achieve the above object, the present invention provides following technical scheme：Change of current when wind-powered electricity generation cluster isolated network accesses soft straight power network State of standing firm traffic coverage method, it comprises the following steps：
(1) wind-powered electricity generation cluster is passive power source, sets up single-ended VSC-HVDC equivalent models, model is as follows：
Stream station is linked into passive system, the passway for transmitting electricity impedance from passive system to current conversion station is Zsys=Rsys+ Xsys；
Wind-powered electricity generation cluster exit potential is
Current conversion station ac bus represents that the power for being injected into PCC from passive system is P with points of common connection PCCs+jQs；
Represented based on the direct current transportation of voltage source converter type using single-phase fundamental equivalent circuit, and set its output voltage base Ripple phasor isWherein, XlinkIt is the connection reactance between current conversion station ac bus PCC and Δ, Xlink=XT+ XL0/ 2, wherein XL0For the bridge arm reactance under fundamental frequency；
(2) active-power P of research injection PCC nodessAnd reactive power QsRange of operation, with v points export wattful power Rate PvAnd reactive power QvIt is used as intermediate variable Sv=Pv+jQv, to PsAnd QsRange of operation analyzed, v node voltages for electricity The object of potential source change of current stand control, it regards balance nodes i.e. v θ nodes as in passive network, therefore has
(3) constraints that current conversion station PQ traffic coverages need to consider is set up；
(4) border of the voltage source converter type direct current transportation power characteristic together decided on by the constraints of step (3) Curve；
(5) current conversion station steady-state operation scope is determined according to the boundary curve of step (4).
Further, preferably, in the step (3), constraints is specially：
(i) the output voltage modulation ratio constraint of voltage source converter station：
V node voltages and power output are, it is known that Δ node voltage can be calculated：
UΔ∠δΔ=(Uv+ΔU1)+jδU1 (1-3)
The output voltage modulation ratio m for generally defining voltage source converter station is equal to the fundamental wave phase voltage amplitude U that Δ navigatesΔmRemove With Udc/2：
Consider the constraints of transverter during actual motion, it is necessary to verify output voltage modulation ratio
0.85≤m≤1.0 (1-6)
(ii) points of common connection node voltage is constrained：Calculate PCC node voltages：
Because the stabilization of voltage in wind-powered electricity generation cluster is adjusted dependent on the dynamic reactive power of voltage source converter station, therefore consider work Practical operation situation in journey, voltage should meet normal voltage deviation range
0.97p.u≤Upcc≤1.07p.u (1-12)
(iii) wind-powered electricity generation cluster Egress node voltage is constrained：Calculate passive system dummy-node voltage
Ps=Pv (1-13)
It is also contemplated that practical operation situation in engineering, voltage should meet normal voltage deviation range：
0.97p.u≤Us≤1.07p.u (1-19)
(iv) constraints of transverter during actual motion, the constraint of current conversion station output current are considered：
(v) consider the active power of flexible DC power transmission transmission by maximum DC line current limit
-UdImax≤Ps≤UdImax (1-21)
Further, preferably, the step of determining current conversion station steady-state operation scope can be divided into：
1) known converter station is set in the specified apparent energy of v points as SvN, that is, work asWhen, VSC is in itself Allow operation.By regionIt is divided into some tiny blocks, each block is with corresponding power points (Pv+ jQv) represent, for all power points, repeat the steps of；
2) Δ node voltage is calculated according to equation (1-1 to 1-4), formula (1-5) calculates modulation ratio；
3) consider the constraints of current conversion station during actual motion, output voltage modulation ratio school is judged according to discriminate (1-6) Whether the Δ node voltage required by core meets requirement, is required if met, it is a rational power points to show the power points, then Further verified by following step；
4) PCC node voltages are calculated according to equation (1-8 to 1-11).
5) consider voltage normal excursions amount scope in power system Practical Project, PCC sections are verified according to discriminate (1-12) Whether point voltage meets voltage constraint requirements, if it is possible to meets constraint, shows that the power points is a rational power points, then Carry out next step verification；
6) conveying power P is calculated according to formula (1-14 to 1-15)sAnd Qs, calculated according to equation (1-16 to 1-18)Section Point voltage.
7) similarly consider voltage normal excursions amount in power system engineering, verified according to discriminate (1-19)Node electricity Whether pressure meets voltage constraint requirements, if constraint can be met, it is a rational power points to show the power points, then is carried out down One step is verified；
8) check whether electric current meets requirement in terms of transverter output current according to discriminate (1-20).Will if met Ask, carry out next step check；
9) consider that the active power that flexible DC power transmission is transmitted is limited by maximum DC line electric current according to discriminate (1-21) System, is verified
Travel through regionInterior all power points, wherein rational power points must correspond to phase at PCC The power points P answeredsAnd Qs, the scope that these power points are covered is exactly the Power operation scope of current conversion station steady-state operation.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention's can draw current conversion station PQ traffic coverages, have though the current conversion station based on voltage source converter can be realized Work(, idle decoupling, can be respectively controlled, but when active power changes, the range of operation of reactive power also changes therewith Become, when conveying a certain active power, the range of operation of reactive power makes the ability of the asymmetric reactive power sent will More than absorbable reactive power, this method it can be considered that when different factor changes, the change of current conversion station PQ traffic coverages can be with Influence of the different factors to traffic coverage is clearly understood that, so it is idle during for the analysis sending end current conversion station passive power network of access Voltage operation characteristic does basis.Current conversion station steady-state operation when the sending end of the primary study of the present invention is wind-powered electricity generation cluster is interval Method, reactive voltage operation characteristic when accessing passive power network to research sending end current conversion station has great importance
Brief description of the drawings
Fig. 1 is the single-ended structural representation based on voltage source converter type direct current transportation；
Fig. 2 is the current conversion station steady-state operation regional structure schematic diagram of the present invention；
Fig. 3 is the flowage structure schematic diagram of the method for the present invention；
Fig. 4 a are current conversion station traffic coverage structural representations when not changing tap position of the present invention；
Current conversion station traffic coverage structural representation when Fig. 4 b are the minimum taps of the present invention；
Current conversion station traffic coverage structural representation when Fig. 4 c are the maximum taps of the present invention；
Fig. 5 is to consider to change all feasible range of operation structural representations of tap；
Current conversion station traffic coverage structural representation when Fig. 6 a are the transmission distance 20km of the present invention；
Current conversion station traffic coverage structural representation when Fig. 6 b are the transmission distance 40km of the present invention；
Current conversion station traffic coverage structural representation when Fig. 6 c are the transmission distance 60km of the present invention；
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made Embodiment, belongs to the scope of protection of the invention.
Fig. 1-3 are referred to, the present invention provides a kind of technical scheme：The change of current is stood firm when wind-powered electricity generation cluster isolated network accesses soft straight power network State traffic coverage method, current conversion station steady-state operation interval method when wind-powered electricity generation cluster isolated network accesses soft straight power network, it includes following step Suddenly：
(1) wind-powered electricity generation cluster is passive power source, sets up single-ended VSC-HVDC equivalent models, model is as follows：
Stream station is linked into passive system, the passway for transmitting electricity impedance from passive system to current conversion station is Zsys=Rsys+ Xsys；
Wind-powered electricity generation cluster exit potential is
Current conversion station ac bus represents that the power for being injected into PCC from passive system is P with points of common connection PCCs+jQs；
Represented based on the direct current transportation of voltage source converter type using single-phase fundamental equivalent circuit, and set its output voltage base Ripple phasor isWherein, XlinkIt is the connection reactance between current conversion station ac bus PCC and Δ, Xlink=XT+ XL0/ 2, wherein XL0For the bridge arm reactance under fundamental frequency；
(2) active-power P of research injection PCC nodessAnd reactive power QsRange of operation, with v points export wattful power Rate PvAnd reactive power QvIt is used as intermediate variable Sv=Pv+jQv, to PsAnd QsRange of operation analyzed, v node voltages for electricity The object of potential source change of current stand control, it regards balance nodes i.e. v θ nodes as in passive network, therefore has
(3) constraints that current conversion station PQ traffic coverages need to consider is set up；
(4) border of the voltage source converter type direct current transportation power characteristic together decided on by the constraints of step (3) Curve；
(5) current conversion station steady-state operation scope is determined according to the boundary curve of step (4).
Wherein, in the step (3), constraints is specially：
(i) the output voltage modulation ratio constraint of voltage source converter station：
V node voltages and power output are, it is known that Δ node voltage can be calculated：
UΔ∠δΔ=(Uv+ΔU1)+jδU1 (1-3)
The output voltage modulation ratio m for generally defining voltage source converter station is equal to the fundamental wave phase voltage amplitude U that Δ navigatesΔmRemove With Udc/2：
Consider the constraints of transverter during actual motion, it is necessary to verify output voltage modulation ratio
0.85≤m≤1.0 (1-6)
(ii) points of common connection node voltage is constrained：Calculate PCC node voltages：
Because the stabilization of voltage in wind-powered electricity generation cluster is adjusted dependent on the dynamic reactive power of voltage source converter station, therefore consider work Practical operation situation in journey, voltage should meet normal voltage deviation range
0.97p.u≤Upcc≤1.07p.u (1-12)
(iii) wind-powered electricity generation cluster Egress node voltage is constrained：Calculate passive system dummy-node voltage
Ps=Pv (1-13)
It is also contemplated that practical operation situation in engineering, voltage should meet normal voltage deviation range：
0.97p.u≤Us≤1.07p.u (1-19)
(iv) constraints of transverter during actual motion, the constraint of current conversion station output current are considered：
(v) consider the active power of flexible DC power transmission transmission by maximum DC line current limit
-UdImax≤Ps≤UdImax (1-21)
The step of determining current conversion station steady-state operation scope can be divided into：
1) known converter station is set in the specified apparent energy of v points as SvN, that is, work asWhen, VSC is in itself Allow operation.By regionIt is divided into some tiny blocks, each block is with corresponding power points (Pv+ jQv) represent, for all power points, repeat the steps of；
2) Δ node voltage is calculated according to equation (1-1 to 1-4), formula (1-5) calculates modulation ratio；
3) consider the constraints of current conversion station during actual motion, output voltage modulation ratio school is judged according to discriminate (1-6) Whether the Δ node voltage required by core meets requirement, is required if met, it is a rational power points to show the power points, then Further verified by following step；
4) PCC node voltages are calculated according to equation (1-8 to 1-11).
5) consider voltage normal excursions amount scope in power system Practical Project, PCC sections are verified according to discriminate (1-12) Whether point voltage meets voltage constraint requirements, if it is possible to meets constraint, shows that the power points is a rational power points, then Carry out next step verification；
6) conveying power P is calculated according to formula (1-14 to 1-15)sAnd Qs, calculated according to equation (1-16 to 1-18)Section Point voltage.
7) similarly consider voltage normal excursions amount in power system engineering, verified according to discriminate (1-19)Node electricity Whether pressure meets voltage constraint requirements, if constraint can be met, it is a rational power points to show the power points, then is carried out down One step is verified；
8) check whether electric current meets requirement in terms of transverter output current according to discriminate (1-20).Will if met Ask, carry out next step check；
9) consider that the active power that flexible DC power transmission is transmitted is limited by maximum DC line electric current according to discriminate (1-21) System, is verified
Travel through regionInterior all power points, wherein rational power points must correspond at PCC Corresponding power points PsAnd Qs, the scope that these power points are covered is exactly the Power operation scope of current conversion station steady-state operation.
VSC-HVDC accesses steady-state operation range applications analysis during passive network：
If it is as shown in the table for the parameter of voltage source converter station, transmission line of electricity voltage class is 230kV, circuit unit length impedance Parameter is j0.306 Ω/km, ignores the resistance and capacity effect of circuit.Systematic parameter is as shown in table 1：
The parameter of the voltage source converter station of table 1
The influence for being coupled transformer to current conversion station traffic coverage is adjusted with this Algorithm Analysis
Fig. 4 a-4c are to produce influence to current conversion station PQ traffic coverages when changing tap position.With connection transformer Timing in tap, no-load voltage ratio increase, current conversion station PQ traffic coverages are with moving up, and traffic coverage diminishes；Under the tap for being coupled transformer Timing, no-load voltage ratio reduces, and current conversion station PQ traffic coverages are moved down, and traffic coverage diminishes, and the PQ traffic coverages of each tap gear are folded Plus final VSC-HVDC system working ranges are formd, as shown in Figure 5.
With this Algorithm Analysis current conversion station to influence of the passive system distance to traffic coverage, using above-mentioned algorithm, pass through Matlab programming simulations, change model parameter, the current conversion station PQ traffic coverages of three cases above can be obtained, by Fig. 6 a-6c It can be seen that, when the distance of current conversion station to passive system is continuously increased, current conversion station PQ traffic coverages scope can constantly reduce, this be by When distance increase, the reactance of current conversion station to passive system is consequently increased, and reactive loss can be caused to increase, so as to cause Power operation point can not meet constraints, and then PQ traffic coverage range reductions.
Pass through above-mentioned Example Verification, it can be deduced that current conversion station PQ traffic coverages：
1) though the current conversion station based on voltage source converter can realize active and reactive decoupling, it can be respectively controlled, When active power changes, the range of operation of reactive power also changes therewith.
2) when conveying a certain active power, the range of operation of reactive power makes the asymmetric reactive power sent Ability is greater than absorbable reactive power.
3) this method is it can be considered that when different factors change, the change of current conversion station PQ traffic coverages can be apparent from To influence of the different factors to traffic coverage, and then reactive voltage operation during for the analysis sending end current conversion station passive power network of access is special Property does basis.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (3)

  1. Current conversion station steady-state operation interval method when 1. wind-powered electricity generation cluster isolated network accesses soft straight power network, it comprises the following steps：
    (1) wind-powered electricity generation cluster is passive power source, sets up single-ended VSC-HVDC equivalent models, model is as follows：
    Stream station is linked into passive system, the passway for transmitting electricity impedance from passive system to current conversion station is Zsys=Rsys+Xsys；
    Wind-powered electricity generation cluster exit potential is
    Current conversion station ac bus represents that the power for being injected into PCC from passive system is P with points of common connection PCCs+jQs；
    Represented based on the direct current transportation of voltage source converter type using single-phase fundamental equivalent circuit, and set its fundamental voltage output of voltage phase Measure and beWherein, XlinkIt is the connection reactance between current conversion station ac bus PCC and Δ, Xlink=XT+XL0/ 2, wherein XL0For the bridge arm reactance under fundamental frequency；
    (2) active-power P of research injection PCC nodessAnd reactive power QsRange of operation, with v points export active-power Pv And reactive power QvIt is used as intermediate variable Sv=Pv+jQv, to PsAnd QsRange of operation analyzed, v node voltages be voltage source The object of change of current stand control, it regards balance nodes i.e. v θ nodes as in passive network, therefore has
    (3) constraints that current conversion station PQ traffic coverages need to consider is set up；
    (4) boundary curve of the voltage source converter type direct current transportation power characteristic together decided on by the constraints of step (3)；
    (5) current conversion station steady-state operation scope is determined according to the boundary curve of step (4).
  2. Current conversion station steady-state operation interval method when 2. wind-powered electricity generation cluster isolated network according to claim 1 accesses soft straight power network, its It is characterised by：In the step (3), constraints is specially：
    (i) the output voltage modulation ratio constraint of voltage source converter station：
    V node voltages and power output are, it is known that Δ node voltage can be calculated：
    UΔ∠δΔ=(Uv+ΔU1)+jδU1 (1-3)
    The output voltage modulation ratio m for generally defining voltage source converter station is equal to the fundamental wave phase voltage amplitude U that Δ navigatesΔmDivided by Udc/ 2：
    Consider the constraints of transverter during actual motion, it is necessary to verify output voltage modulation ratio
    0.85≤m≤1.0 (1-6)
    (ii) points of common connection node voltage is constrained：Calculate PCC node voltages：
    Because the stabilization of voltage in wind-powered electricity generation cluster is adjusted dependent on the dynamic reactive power of voltage source converter station, therefore consider in engineering Practical operation situation, voltage should meet normal voltage deviation range
    0.97p.u≤Upcc≤1.07p.u (1-12)
    (iii) wind-powered electricity generation cluster Egress node voltage is constrained：Calculate passive system dummy-node voltage
    Ps=Pv (1-13)
    It is also contemplated that practical operation situation in engineering, voltage should meet normal voltage deviation range：
    0.97p.u≤Us≤1.07p.u (1-19)
    (iv) constraints of transverter during actual motion, the constraint of current conversion station output current are considered：
    (v) consider the active power of flexible DC power transmission transmission by maximum DC line current limit
    -UdImax≤Ps≤UdImax (1-21)。
  3. Current conversion station steady-state operation interval method when 3. wind-powered electricity generation cluster isolated network according to claim 2 accesses soft straight power network, its It is characterised by：The step of determining current conversion station steady-state operation scope can be divided into：
    1) known converter station is set in the specified apparent energy of v points as SvN, that is, work asWhen, VSC is to allow in itself Operation；By regionIt is divided into some tiny blocks, each block is with corresponding power points (Pv+jQv) Represent, for all power points, repeat the steps of；
    2) Δ node voltage is calculated according to equation (1-1 to 1-4), formula (1-5) calculates modulation ratio；
    3) consider the constraints of current conversion station during actual motion, judge that output voltage modulation ratio checks institute according to discriminate (1-6) Whether the Δ node voltage asked meets requirement, is required if met, it is a rational power points to show the power points, then is passed through Following step is further verified；
    4) PCC node voltages are calculated according to equation (1-8 to 1-11)；
    5) consider voltage normal excursions amount scope in power system Practical Project, PCC nodes electricity is verified according to discriminate (1-12) Whether pressure meets voltage constraint requirements, if it is possible to meet constraint, it is a rational power points to show the power points, then is carried out Next step is verified；
    6) conveying power P is calculated according to formula (1-14 to 1-15)sAnd Qs, calculated according to equation (1-16 to 1-18)Node electricity Pressure；
    7) similarly consider voltage normal excursions amount in power system engineering, verified according to discriminate (1-19)Node voltage is No to meet voltage constraint requirements, if constraint can be met, it is a rational power points to show the power points, then carries out next step Verification；
    8) check whether electric current meets requirement in terms of transverter output current according to discriminate (1-20)；Required if met, Carry out next step check；
    9) active power for considering flexible DC power transmission transmission according to discriminate (1-21) is entered by maximum DC line current limit Row verification
    Travel through regionInterior all power points, wherein rational power points must correspond at PCC accordingly Power points PsAnd Qs, the scope that these power points are covered is exactly the Power operation scope of current conversion station steady-state operation.
CN201710361383.9A 2017-05-19 2017-05-19 Current conversion station steady-state operation interval method when wind-powered electricity generation cluster isolated network accesses soft straight power network Withdrawn CN107017652A (en)

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Publication number Priority date Publication date Assignee Title
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Application publication date: 20170804