CN105162161B - A kind of wind power base transient state of sending outside containing different type blower fan cuts machine control method - Google Patents
A kind of wind power base transient state of sending outside containing different type blower fan cuts machine control method Download PDFInfo
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Abstract
Machine control method is cut the present invention relates to a kind of wind power base transient state of sending outside containing different type blower fan, it is comprised the following steps：Calculate the lower power system required fired power generating unit always cut in the case of machine amount and power system cut machine in optimization air-gas ratio example under Transient Stability Constraints that is out of order and cut machine amount；Parameter initialization, DFIG units cut machine amount decreasing value, SCIG units and cut that machine amount value added, DFIG units initially cut machine amount and SCIG units initially cut machine amount in power system when initial parameter cuts machine scheme including adjustment；Foundation is cut machine index and line power oscillation damping and cuts machine model than being the Bi-objective of target to the maximum with electrical power system transient energy；Machine model is cut to Bi-objective to carry out obfuscation and calculates and add weight coefficient to obtain the fuzzy transient state of Two-Weighted-Objective to cut machine model；Adjustment weight coefficient, calculate by cutting Two-Weighted-Objective fuzzy transient state on machine model and obtains that DFIG units cut machine amount and SCIG units cut the allocation result of machine amount.The composite can be widely applied to wind power base transient state cuts machine control.
Description
Technical field
The present invention relates to wind-electricity integration technical field, wind-powered electricity generation base is sent outside containing different type blower fan especially with regard to a kind of
Ground transient state cuts machine control method.
Background technology
As the continuous of nine ten million multikilowatt wind power base built by separate periods of national planning is carried out, on the one hand fill wind-powered electricity generation
Permeability of the machine capacity in power system is improved constantly, and is on the other hand formd a wind power base and is contained different type wind-powered electricity generation
The general layout of unit, is no lack of main with mouse-cage type asynchronous wind driven generator (Squirrel Cage in the presence of building in the early stage
Induction Generators:SCIG large-scale use double-fed induction wind driven generator (Double Fed are progressively turned to after)
Induction Generator, DFIG) large-scale wind electricity base.And the big multiposition of these wind power bases is more inclined, on-site elimination energy
Power is small, and extensive fluctuation wind-powered electricity generation is dissolved often through delivering to other regional power grids outside the mode for taking " wind-powered electricity generation thermoelectricity bundling ".
Wind power base built by separate periods and the acceleration for sending engineering outside, while economic benefit is brought, also to the transient stability of power system
Property causes influence.It is conventional and for wind fire bundling delivery system, it is weak not only exist conventional long-range Transmission Corridor transmittability
The excessive problem of fired power generating unit acceleration energy, also there is wind power plant voltage support ability, excessively weak to reduce further delivery system defeated
Electric energy power, and Wind turbines accelerate the problem of unstability in itself.And different type blower fan presents different in transient process
Characteristic, while can interact, makes the transient stability sex chromosome mosaicism of power system more complicated, more serious.
Power system after catastrophe failure, be usually taken cut machine control it is stability to improve transient state.But ought only cut off
During conventional fired power generating unit, on the one hand weaken and normal for the excessively weak delivery system ability to transmit electricity for causing of wind power plant voltage support ability
The problems such as rule fired power generating unit, Wind turbines accelerate unstability in itself can not be well solved, and on the other hand also result in surplus
The wind-powered electricity generation penetrance of remaining power network is larger, system damping ratio declines obvious, has a strong impact on system oscillation recovery process.It can be seen that traditional
Simple excision fired power generating unit measure is difficult to ensure that the stabilization containing wind-powered electricity generation power system is recovered, it is necessary to research coordination excision is a certain amount of
Wind turbines.However, influence of the different type blower fan in self stability, damping characteristic and to system is different.How to assist
Different type blower fan and fired power generating unit are adjusted, effective machine scheme of cutting is formulated to ensureing the stable operation tool of wind power integration power system
It is significant.
And it is current, cutting machine in Wind turbines influences and cuts the research of machine decision-making level less.Document《It is wind farm grid-connected to orphan
The influence research of net high-frequency cutting machine》(electric power network technique, 2012,36 (01):58-64) have studied the orphan for thering is wind power plant to run after failure
Net system transient modelling process and safety control action situation, propose to principle the high-frequency cutting machine strategy containing wind power plant；Text
Offer《Large-scale wind power accesses lower Wind turbines and cuts machine Study on Measures》(Proceedings of the CSEE, 2011,31 (19)：25-36)
Point out that the acceleration energy that conventional fired power generating unit is obtained is more than Wind turbines, should suitably increase fired power generating unit cuts machine amount, while referring to
It has to ensure that the fired power generating unit retained after failure, to system frequency and the control ability of voltage, should suitably cut off Wind turbines；Text
Offer《Wind fire bundling delivery system transient stability cuts machine control》(electric power network technique, 2013,37 (02):514-519) labor
The otherness and each influence to power system transient stability of Wind turbines and fired power generating unit transient characterisitics, it is proposed that fired power generating unit
Machine prioritization scheme is cut with Wind turbines.But above-mentioned most principles of identifying scheme of document, for excision Wind turbines to temporary
The quantitative study of state stability is seldom related to.Document《Wind-electricity integration transient state based on improvement branch road transient energy function is optimal to cut
Machine is controlled》(electric power system protection and control, 2014,42 (18):72-77) pointing out should in the emergent control of wind-electricity integration system
Consider that wind-powered electricity generation and fired power generating unit cut the cooperation of machine ratio, and to cut the minimum object function of busbar voltage fluctuation after machine, propose one
Plant the optimal of consideration wind-driven generator and cut machine decision model.But the object of research is just for same type of Wind turbines, and
And do not account for the homeostasis sex chromosome mosaicism of Wind turbines.Therefore it is the comprehensive above problems that solve, it is necessary to one kind is to containing
The wind power base transient state of sending outside of different type blower fan cuts machine control method to effectively improve the stability of system.
The content of the invention
Regarding to the issue above, it is an object of the invention to provide one kind in wind power base is arranged SCIG units and DFIG units
Take into full account that power system, when forward swing time improvement and line power vibration recovery process, effectively improves system fortune when cutting machine amount
The wind power base transient state of sending outside containing different type blower fan of row security and stability cuts machine control method.
To achieve the above object, the present invention takes following technical scheme：It is a kind of to send wind-powered electricity generation outside containing different type blower fan
Base transient state cuts machine control method, and it is comprised the following steps：
1) calculating is out of order, and lower power system is required under Transient Stability Constraints always to cut machine amount PzWith power system in optimization
The fired power generating unit that air-gas ratio example is cut in the case of machine cuts machine amount Ph；
2) parameter initialization, DFIG units cut machine amount decreasing value in power system when initial parameter cuts machine scheme including adjustment
Or value added Δ Pw1, SCIG units cut machine amount value added or decreasing value Δ Pw2, DFIG units initially cut machine amount Pw1With SCIG units
Initially cut machine amount Pw2；
3) set up and machine index and line power oscillation damping are cut than being the double of target to the maximum with the transient state energy of power system
Target cuts machine model；
4) machine model is cut to Bi-objective carry out obfuscation and calculate and add weight coefficient to obtain the fuzzy transient state of Two-Weighted-Objective
Cut machine model；
5) the fuzzy transient state of adjustment Two-Weighted-Objective cuts the weight coefficient in machine model, and transient state is obscured by Two-Weighted-Objective
The machine model of cutting calculate and obtains DFIG units and cut machine amount and SCIG units cut the allocation result of machine amount.
The step 1) in, power system is required under Transient Stability Constraints always to cut machine amount PzFor power system sending end is exchanged
K times of power and transient stability limit transimission power difference before section accident, the value of Proportional coefficient K is by the electricity in power system
Web frame and its method for operation determine that the span of K is 5~10.
The step 2) in, DFIG units cut machine amount decreasing value or value added Δ in power system when machine scheme is cut in adjustment
Pw1, SCIG units cut machine amount value added or decreasing value Δ Pw2, DFIG units initially cut machine amount Pw1Machine amount is initially cut with SCIG units
Pw2Relation it is as follows：
ΔPw1=Δ Pw2；
Pw1=Pw2=(Pz-Ph)/2。
The step 3) in machine index cut with the transient state energy of power system and line power oscillation damping ratio is mesh to the maximum
It is as follows that target Bi-objective cuts machine model：
minf1(Pw1, Pw2)=- I '；
minf2(Pw1, Pw2)=- ζ；
In formula, minf1(Pw1,Pw2) minimum of machine index negative value is cut for the transient state energy that wind power base cuts power system after machine
Value；I ' cuts machine index for the transient state energy that wind power base cuts power system after machine；- I ' cuts power system after machine for wind power base
Transient state energy cuts the negative value of machine index；minf2(Pw1,Pw2) the line power oscillation damping of power system after machine is cut for wind power base
Than the minimum value of negative value；ζ cuts the line power oscillation damping ratio of power system after machine for wind power base；- ζ cuts machine for wind power base
Afterwards the line power oscillation damping of power system than negative value；
Wherein, Bi-objective is cut the constraints of machine model and is included：
1. cutting machine amount control constraints condition is：
Ph+Pw1+Pw2=Pz；
2. Static Security Constraints condition is：
umin≤u≤umax；
|Pb|≤Pbmax；
In formula, u cuts the voltage of all buses in power system after machine, u for wind power baseminAnd umaxRespectively wind power base
Cut the higher limit and lower limit of the voltage of all buses in power system after machine；|Pb| for wind power base is cut after machine in power system
The sizes values of all Line Flows, PbmaxThe binding occurrence of all Line Flows in power system after machine is cut for wind power base.
The step 3) in, wind power base cut power system after machine transient state energy cut machine index I ' calculating include it is as follows
Step：
(1) the transient state kinetic energy V of power system is calculatedKE, computing formula is：
In formula, n is positive integer, and i represents i-th generator, MiIt is i-th rotary inertia of generator, ωiIt is i-th hair
The angular speed of motor, wherein, the rotary inertia of i-th generator and the angular speed of i-th generator are in system inertia
Perunit value under heart coordinate；
(2) power system t after a failureecTime trigger cuts machine control measure u, and hereafter, power system is in the temporary of t
State kinetic energy VKE(u, t) is：
VKE(u, t)=VKE(0,t)+ΔEK(u,t)；t∈(tec,tec+Δt)；
In formula, t is that the moment after machine control measure u is cut in triggering；Δ t is when cutting one section after machine control measure u is implemented
Between；VKE(0, it is t) not trigger transient state kinetic energy of the power system in t when cutting machine control measure u；ΔEK(u, t) is to cut machine control
Measure u processed to power system the transient state kinetic energy of t disturbance term.
(3) cut machine control measure u to power system the transient state kinetic energy of t disturbance term Δ EKThe calculating of (u, t) is public
Formula is as follows：
In formula, Δ EkH(u, t) be cut machine control measure u to fired power generating unit in power system t transient state kinetic energy
Disturbance term, Δ EkW(u, t) be cut machine control measure u to SCIG units in power system the transient state kinetic energy of t disturbance term,
VKEH(0, it is t) not trigger when cutting machine control measure u transient state kinetic energy of the fired power generating unit in t in power system；VKEW(0, t) be
Transient state kinetic energy of the SCIG units in t in power system is not triggered when cutting machine control measure u；VKEH(u, t) cuts machine control for triggering
Transient state kinetic energy of the fired power generating unit in t in power system after measure u processed；VKEW(u, t) cuts electricity after machine control measure u for triggering
Transient state kinetic energy of the SCIG units in t in Force system；PACC,iAnd P'ACC,iDo not triggered under COI coordinates respectively and cut machine control
The accelerating power of the power system fired power generating unit of machine control measure u is cut in measure u and triggering；PWACC,iAnd P'WACC,iRespectively in COI
The accelerating power cut machine control measure u and trigger the SCIG units for cutting machine control measure u is not triggered under coordinate；ΔEkH(tec) be
Fired power generating unit cuts the decrement of kinetic energy after machine；ΔEkW(tec) decrement of kinetic energy after machine is cut for SCIG units；GH is fired power generating unit
The number of middle generator；GW is the number of generator in SCIG units；
(4) computing formula that the transient state energy after Shedding In Power System cuts machine index I ' is：
I '=first Max or Min Δs EK(u,t)/VKE(u,t),t∈(tec,tec+Δt)；
Wherein, first Max or Min Δs EK(u, t) refers to the transient state that power system after machine control measure u is cut in triggering
Kinetic energy destabilization Δ EKFirst extreme value of (u, t).
The step 4) in, the expression formula that the fuzzy transient state of the Two-Weighted-Objective containing weight coefficient cuts machine model is as follows：
In formula, β1For the transient state energy that wind power base cuts power system after machine cuts the minimum weight coefficient of machine index negative value, β2
The weight coefficient of the line power oscillation damping than negative value minimum of power system after machine, λ are cut for wind power base1To meet power train
System transient state energy cuts the degree of membership of machine Con trolling index and its corresponding constraints, i.e. transient state energy and cuts the maximum of machine Con trolling index and expires
Meaning degree；λ2To meet circuit on power system damping of power oscillation than target and its degree of membership of corresponding constraints, i.e. circuit work(
Rate oscillation damping than maximum satisfaction, max (β1λ1+β2λ2) represent β1λ1+β2λ2Maximum；c01It is when wind power base cuts machine
The transient state energy of power system cuts machine index negative value when the transient state energy of power system cuts machine index negative value minimum afterwards；When wind-powered electricity generation base
Cut power system after machine line power oscillation damping it is more minimum than negative value when, c02It is power system after wind power base cuts machine
The line power oscillation damping of power system compares negative value when line power oscillation damping is than negative value minimum；δ01It is temporary for power system
State energy cuts the stroke of machine index negative value；δ02It is the stroke of the line power oscillation damping than negative value of power system；U is wind
Cut the voltage of all buses in power system after machine, u in electric baseminAnd umaxRespectively wind power base cuts after machine institute in power system
There are the higher limit and lower limit of the voltage of bus；|Pb| the size of all Line Flows in power system after machine is cut for wind power base
Value, PbmaxThe binding occurrence of all Line Flows in power system after machine is cut for wind power base.
The step 4) in, Bi-objective is cut machine model carry out obfuscation calculate obtain the Bi-objective containing weight coefficient add
The fuzzy transient state of power cuts machine model, comprises the following steps：
(1) during carrying out cutting machine control to wind power base, machine amount decreasing value Δ P is cut by DFIG unitsw1Reduce
DFIG units cut machine amount, while cutting machine amount value added Δ P by SCIG unitsw2After increase SCIG units cut machine amount, work as wind power base
Cut power system after machine transient state energy cut machine index negative value it is minimum when, the transient state energy for calculating now power system cuts machine index
Negative value c01With line power oscillation damping than negative value c02', and now DFIG units cut machine amount and SCIG units cut machine amount；
(2) again since initially machine amount is cut, machine amount value added Δ Pw1 increase DFIG units are cut by DFIG units and cuts machine
Amount, while cut machine amount decreasing value Δ Pw2 by SCIG units reducing after SCIG units cut machine amount, power train after wind power base cuts machine
When the line power oscillation damping of system is more minimum than negative value, the transient state energy for calculating now power system cuts machine index negative value c01' and
Line power oscillation damping is than negative value c02, and now DFIG units cut machine amount and SCIG units cut machine amount；
(3) machine index negative value and line power oscillation damping ratio are cut according to the transient state energy cut in machine control to power system
The difference of negative value requirement, determines that the transient state energy of power system cuts the stroke δ of machine index negative value01With line power oscillation damping
Than the stroke δ of negative value02；Wherein, transient state energy cuts the stroke δ of machine index negative value01Compare negative value with line power oscillation damping
Stroke δ02Meet following condition：
c01+δ01＜ c01′；
c02+δ02＜ c02′；
(4) determine that Bi-objective cuts the target membership function mui [f of machine model1(x)] and μ [f2(x)] expression formula it is as follows：
In formula, x=[Pw1,Pw2]T, T represents and turns order；f1X () cuts for the transient state energy that wind power base cuts power system after machine
Machine index negative value；f2X () compares negative value for the line power oscillation damping that wind power base cuts power system after machine；
(5) cut that machine index negative value is minimum and line oscillation resistance according to the transient state energy that power system after machine is cut to wind power base
Buddhist nun's requirement more different than negative value two targets of minimum, determines the weight coefficient of each target, so as to obtain Two-Weighted-Objective obscure
Transient state cuts machine model, and expression formula is as follows：
Due to taking above technical scheme, it has advantages below to the present invention：The present invention is temporary with power system due to using
State energy is cut machine Con trolling index and is characterized when forward swing time improvement, more extensive than change sign system oscillation with line power oscillation damping
Complex velocity, while cutting machine Con trolling index and line power oscillation damping than two conflicting of target, profit in view of transient state energy
Establish that Two-Weighted-Objective is fuzzy to cut machine model with Multi-Objective Decision Theory, and introduce weight factor, according to different large-scale wind
The requirement in electric base sets different weight coefficients to each target so that SCIG units and DFIG machines in wind power base is arranged
Group can take into full account that power system, when forward swing time improvement and line power vibration resume speed, is ensureing temporary when cutting machine amount
On the premise of state stabilization, reasonable selection different type wind-powered electricity generation is optimal to cut machine ratio, can preferably solve during wind power base cuts machine control
Conflicting multi-objective optimization question, meets different stability requirements, effectively improves the security and stability of system operation.It is comprehensive
Upper described, what the present invention can be widely applied to wind power base transient state cuts machine control.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the invention
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the present invention provides a kind of wind power base transient state of sending outside containing different type blower fan cuts machine controlling party
Method, comprises the following steps：
1) calculating is out of order, and lower power system is required under Transient Stability Constraints always to cut machine amount PzWith power system in optimization
The fired power generating unit that air-gas ratio example is cut in the case of machine cuts machine amount Ph。
Wherein, power system is required under Transient Stability Constraints always cuts machine amount PzFor power system sending end exchanges section accident
K times of preceding power and transient stability limit transimission power difference, the value of Proportional coefficient K by the electric network composition in power system and
Its method of operation determines that the span of K is 5~10.
2) parameter initialization, DFIG units cut machine amount decreasing value in power system when initial parameter cuts machine scheme including adjustment
Or value added Δ Pw1, SCIG units cut machine amount value added or decreasing value Δ Pw2, DFIG units initially cut machine amount Pw1With SCIG units
Initially cut machine amount Pw2。
Wherein, Δ Pw1=Δ Pw2；Pw1=Pw2=(Pz-Ph)/2。
3) set up and machine index and line power oscillation damping are cut than being the double of target to the maximum with the transient state energy of power system
It is as follows that target cuts machine model：
minf1(Pw1, Pw2)=- I ' (1)
minf2(Pw1, Pw2)=- ζ (2)
In formula, minf1(Pw1,Pw2) minimum of machine index negative value is cut for the transient state energy that wind power base cuts power system after machine
Value；I ' cuts machine index for the transient state energy that wind power base cuts power system after machine；- I ' cuts power system after machine for wind power base
Transient state energy cuts the negative value of machine index；minf2(Pw1,Pw2) the line power oscillation damping of power system after machine is cut for wind power base
Than the minimum value of negative value；ζ cuts the line power oscillation damping ratio of power system after machine for wind power base；- ζ cuts machine for wind power base
Afterwards the line power oscillation damping of power system than negative value.
Wherein, Bi-objective is cut the constraints of machine model and is included：
1. cutting machine amount control constraints condition is：
Ph+Pw1+Pw2=Pz (3)
2. Static Security Constraints condition is：
umin≤u≤umax (4)
|Pb|≤Pbmax (5)
In formula, u cuts the voltage of all buses in power system after machine, u for wind power baseminAnd umaxRespectively wind power base
Cut the higher limit and lower limit of the voltage of all buses in power system after machine；|Pb| for wind power base is cut after machine in power system
The sizes values of all Line Flows, PbmaxThe binding occurrence of all Line Flows in power system after machine is cut for wind power base.
Wherein, wind power base is cut the transient state energy of power system after machine and cuts the calculating of machine index I ' and comprise the following steps：
(1) the transient state kinetic energy V of power system is calculatedKE, computing formula is：
In formula, n is positive integer, and i represents i-th generator, MiIt is i-th rotary inertia of generator, ωiIt is i-th hair
The angular speed of motor, wherein, the rotary inertia of i-th generator and the angular speed of i-th generator are in system inertia
Perunit value under the heart (COI) coordinate.
(2) power system t after a failureecTime trigger cuts machine control measure u, and hereafter, power system is in the temporary of t
State kinetic energy VKE(u, t) is：
VKE(u, t)=VKE(0,t)+ΔEK(u,t)；t∈(tec,tec+Δt) (7)
In formula, t is that the moment after machine control measure u is cut in triggering；Δ t is when cutting one section after machine control measure u is implemented
Between；VKE(0, it is t) not trigger transient state kinetic energy of the power system in t when cutting machine control measure u；ΔEK(u, t) is to cut machine control
Measure u processed to power system the transient state kinetic energy of t disturbance term.
(3) cut machine control measure u to power system the transient state kinetic energy of t disturbance term Δ EKThe calculating of (u, t) is public
Formula is as follows：
In formula, Δ EkH(u, t) be cut machine control measure u to fired power generating unit in power system t transient state kinetic energy
Disturbance term, Δ EkW(u, t) be cut machine control measure u to SCIG units in power system the transient state kinetic energy of t disturbance term,
VKEH(0, it is t) not trigger when cutting machine control measure u transient state kinetic energy of the fired power generating unit in t in power system；VKEW(0, t) be
Transient state kinetic energy of the SCIG units in t in power system is not triggered when cutting machine control measure u；VKEH(u, t) cuts machine control for triggering
Transient state kinetic energy of the fired power generating unit in t in power system after measure u processed；VKEW(u, t) cuts electricity after machine control measure u for triggering
Transient state kinetic energy of the SCIG units in t in Force system；PACC,iAnd P'ACC,iDo not triggered under COI coordinates respectively and cut machine control
The accelerating power of the power system fired power generating unit of machine control measure u is cut in measure u and triggering；PWACC,iAnd P'WACC,iRespectively in COI
The accelerating power cut machine control measure u and trigger the SCIG units for cutting machine control measure u is not triggered under coordinate；ΔEkH(tec) be
Fired power generating unit cuts the decrement of kinetic energy after machine；ΔEkW(tec) decrement of kinetic energy after machine is cut for SCIG units；GH is fired power generating unit
The number of middle generator；GW is the number of generator in SCIG units.
(4) computing formula that the transient state energy after Shedding In Power System cuts machine index I ' is：
I '=first Max or Min Δs EK(u,t)/VKE(u,t),t∈(tec,tec+Δt) (9)
Wherein, first Max or Min Δs EK(u, t) refers to the transient state that power system after machine control measure u is cut in triggering
Kinetic energy destabilization Δ EKFirst extreme value of (u, t).
4) machine model is cut to Bi-objective carry out obfuscation and calculate and add weight coefficient to obtain the fuzzy transient state of Two-Weighted-Objective
Machine model is cut, is comprised the following steps：
(1) during carrying out cutting machine control to wind power base, machine amount decreasing value Δ P is cut by DFIG unitsw1Reduce
DFIG units cut machine amount, while cutting machine amount value added Δ P by SCIG unitsw2After increase SCIG units cut machine amount, work as wind power base
Cut power system after machine transient state energy cut machine index negative value it is minimum when, the transient state energy for calculating now power system cuts machine index
Negative value c01With line power oscillation damping than negative value c02', and now DFIG units cut machine amount and SCIG units cut machine amount.
(2) again since initially machine amount is cut, machine amount value added Δ Pw1 increase DFIG units are cut by DFIG units and cuts machine
Amount, while cut machine amount decreasing value Δ Pw2 by SCIG units reducing after SCIG units cut machine amount, power train after wind power base cuts machine
When the line power oscillation damping of system is more minimum than negative value, the transient state energy for calculating now power system cuts machine index negative value c01' and
Line power oscillation damping is than negative value c02, and now DFIG units cut machine amount and SCIG units cut machine amount.
(3) machine index negative value and line power oscillation damping ratio are cut according to the transient state energy cut in machine control to power system
The difference of negative value requirement, determines that the transient state energy of power system cuts the stroke δ of machine index negative value01With line power oscillation damping
Than the stroke δ of negative value02.Wherein, transient state energy cuts the stroke δ of machine index negative value01Compare negative value with line power oscillation damping
Stroke δ02Meet following condition：
c01+δ01＜ c01′ (10)
c02+δ02＜ c02′ (11)
(4) determine that Bi-objective cuts the target membership function mui [f of machine model1(x)] and μ [f2(x)] expression formula it is as follows：
In formula, x=[Pw1,Pw2]T, T represents and turns order；f1X () cuts for the transient state energy that wind power base cuts power system after machine
Machine index negative value；f2X () compares negative value for the line power oscillation damping that wind power base cuts power system after machine.
(5) cut that machine index negative value is minimum and line oscillation resistance according to the transient state energy that power system after machine is cut to wind power base
Buddhist nun's requirement more different than negative value two targets of minimum, determines the weight coefficient of each target, so as to obtain Two-Weighted-Objective obscure
Transient state cuts machine model, and expression formula is as follows：
In formula, β1For the transient state energy that wind power base cuts power system after machine cuts the minimum weight coefficient of machine index negative value, β2
The weight coefficient of the line power oscillation damping than negative value minimum of power system after machine, λ are cut for wind power base1To meet power train
System transient state energy cuts the degree of membership of machine Con trolling index and its corresponding constraints, i.e. transient state energy and cuts the maximum of machine Con trolling index and expires
Meaning degree；λ2To meet circuit on power system damping of power oscillation than target and its degree of membership of corresponding constraints, i.e. circuit work(
Rate oscillation damping than maximum satisfaction, max (β1λ1+β2λ2) represent β1λ1+β2λ2Maximum.
5) the fuzzy transient state of adjustment Two-Weighted-Objective cuts the weight coefficient in machine model, and transient state is obscured by Two-Weighted-Objective
The machine model of cutting calculate and obtains DFIG units and cut machine amount and SCIG units cut the allocation result of machine amount.
Embodiment
It is analyzed using the wind farm grid-connected systems of CIGRE B4-39, generator is using detailed model in system and considers
Pressure regulation and governing system, its wind fire bundling ratio is 1:1.57, load is using 70% constant-impedance and the static mould of 30% invariable power
Type.Assuming that there is three phase short circuit fault in one bar of line that circuit is sent outside in double loop during 100 cycle, by sending event after 0.32s outside
Barrier circuit disconnects, and fault clearance is sent outside the step of wind power base transient state cuts machine control method to CIGRE B4-39 wind according to above-mentioned
Electric field grid-connected system is calculated, as a result as shown in table 1.
The desired value being calculated under the different weight coefficients of table 1
As shown in Table 1, as (β1,β2)=(1.0,0.0) when, the transient state energy that wind power base cuts power system after machine cuts machine
Con trolling index I ' is maximum, now improves when forward swing time best results.As (β1,β2)=(0.0,1.0) when, after wind power base cuts machine
The line power oscillation damping of power system is more maximum than ζ, and now line power vibration recovery process is most fast.
The transient state energy that wind power base cuts power system after machine cuts machine Con trolling index I ' with line power oscillation damping than ζ meetings
It is incremented by as its respective weights is incremented by.In practical application, weight coefficient can be adjusted according to the significance level of each target, to problem
Solution more targetedly and applicability.When the transient state energy that model biases toward power system after wind power base cuts machine cuts machine control
During index I ' processed, weight coefficient is adjusted, it is minimum that the transient state energy for making wind power base cut power system after machine cuts machine index negative value
Weight coefficient β1Bigger than normal, SCIG units cut the increase of machine amount；When model biases toward the circuit work(of power system after wind power base cuts machine
When rate oscillation damping is than ζ, weight coefficient is adjusted, the line power oscillation damping for making wind power base cut power system after machine compares negative value
Minimum weight coefficient β2Bigger than normal, DFIG unit machines amount increases.Externally send wind power base to carry out transient state using the inventive method to cut
When machine is controlled, different weight coefficients can be set according to the requirement of different wind power bases, in wind power base is arranged SCIG units with
DFIG units consider that power system vibrates recovery process faster when forward swing time improvement and line power when cutting machine amount, abundant body
Multifactor fairness is showed.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft etc. are all
Can be what is be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be excluded
Outside protection scope of the present invention.
Claims (6)
1. a kind of wind power base transient state of sending outside containing different type blower fan cuts machine control method, and it is comprised the following steps：
1) calculating is out of order, and lower power system is required under Transient Stability Constraints always to cut machine amount PzWith power system in optimization air-gas ratio
The fired power generating unit that example is cut in the case of machine cuts machine amount Ph；
2) parameter initialization, DFIG units cut machine amount decreasing value or increasing in power system when initial parameter cuts machine scheme including adjustment
Value added Δ Pw1, SCIG units cut machine amount value added or decreasing value Δ Pw2, DFIG units initially cut machine amount Pw1It is initial with SCIG units
Cut machine amount Pw2；
3) set up and machine index and line power oscillation damping are cut than being the Bi-objective of target to the maximum with the transient state energy of power system
Cut machine model；
The step 3) in machine index and line power oscillation damping are cut than being target to the maximum with the transient state energy of power system
It is as follows that Bi-objective cuts machine model：
min f1(Pw1, Pw2)=- I '；
min f2(Pw1, Pw2)=- ζ；
In formula, min f1(Pw1,Pw2) minimum value of machine index negative value is cut for the transient state energy that wind power base cuts power system after machine；
I ' cuts machine index for the transient state energy that wind power base cuts power system after machine；- I ' cuts the temporary of power system after machine for wind power base
State energy cuts the negative value of machine index；min f2(Pw1,Pw2) the line power oscillation damping of power system after machine is cut for wind power base
Than the minimum value of negative value；ζ cuts the line power oscillation damping ratio of power system after machine for wind power base；- ζ cuts machine for wind power base
Afterwards the line power oscillation damping of power system than negative value；
Wherein, Bi-objective is cut the constraints of machine model and is included：
1. cutting machine amount control constraints condition is：
Ph+Pw1+Pw2=Pz；
2. Static Security Constraints condition is：
umin≤u≤umax；
|Pb|≤Pbmax；
In formula, u cuts the voltage of all buses in power system after machine, u for wind power baseminAnd umaxRespectively wind power base cuts machine
Afterwards in power system the voltage of all buses higher limit and lower limit；|Pb| cut after machine for wind power base and owned in power system
The sizes values of Line Flow, PbmaxThe binding occurrence of all Line Flows in power system after machine is cut for wind power base；
4) machine model is cut to Bi-objective to carry out obfuscation and calculates and add weight coefficient to obtain the fuzzy transient state of Two-Weighted-Objective to cut machine
Model；
5) the fuzzy transient state of adjustment Two-Weighted-Objective cuts the weight coefficient in machine model, and machine is cut by the fuzzy transient state of Two-Weighted-Objective
Model calculate and obtains DFIG units and cut machine amount and SCIG units cut the allocation result of machine amount.
2. a kind of wind power base transient state of sending outside containing different type blower fan as claimed in claim 1 cuts machine control method, its
It is characterised by：The step 1) in, power system is required under Transient Stability Constraints always to cut machine amount PzFor power system sending end is handed over
K times of power and transient stability limit transimission power difference before flow section accident, the value of Proportional coefficient K is by power system
Electric network composition and its method for operation determine that the span of K is 5~10.
3. a kind of wind power base transient state of sending outside containing different type blower fan as claimed in claim 1 cuts machine control method, its
It is characterised by：The step 2) in, DFIG units cut machine amount decreasing value or value added Δ in power system when machine scheme is cut in adjustment
Pw1, SCIG units cut machine amount value added or decreasing value Δ Pw2, DFIG units initially cut machine amount Pw1Machine amount is initially cut with SCIG units
Pw2Relation it is as follows：
ΔPw1=Δ Pw2；
Pw1=Pw2=(Pz-Ph)/2。
4. a kind of wind power base transient state of sending outside containing different type blower fan as claimed in claim 1 cuts machine control method, its
It is characterised by：The step 3) in, the transient state energy that wind power base cuts power system after machine is cut the calculating of machine index I ' and is included such as
Lower step：
(1) the transient state kinetic energy V of power system is calculatedKE, computing formula is：
In formula, n is positive integer, and i represents i-th generator, MiIt is i-th rotary inertia of generator, ωiIt is i-th generator
Angular speed, wherein, the rotary inertia of i-th generator and the angular speed of i-th generator are and are sat at system inertia center
Perunit value under mark；
(2) power system t after a failureecTime trigger cuts machine control measure u, and hereafter, power system is moved in the transient state of t
Can VKE(u, t) is：
VKE(u, t)=VKE(0,t)+ΔEK(u,t)；t∈(tec,tec+Δt)；
In formula, t is that the moment after machine control measure u is cut in triggering；Δ t is to cut a period of time after machine control measure u is implemented；VKE
(0, it is t) not trigger transient state kinetic energy of the power system in t when cutting machine control measure u；ΔEK(u, t) is to cut machine control measure
U to power system the transient state kinetic energy of t disturbance term,
(3) cut machine control measure u to power system the transient state kinetic energy of t disturbance term Δ EKThe computing formula of (u, t) is such as
Under：
In formula, Δ EkH(u, t) be cut machine control measure u to fired power generating unit in power system the transient state kinetic energy of t disturbance
, Δ EkW(u, t) be cut machine control measure u to SCIG units in power system the transient state kinetic energy of t disturbance term, VKEH
(0, it is t) not trigger when cutting machine control measure u transient state kinetic energy of the fired power generating unit in t in power system；VKEW(0, t) for not
Transient state kinetic energy of the SCIG units in t in power system when machine control measure u is cut in triggering；VKEH(u, t) cuts machine control for triggering
Transient state kinetic energy of the fired power generating unit in t in power system after measure u；VKEW(u, t) cuts electric power after machine control measure u for triggering
Transient state kinetic energy of the SCIG units in t in system；PACC,iAnd P'ACC,iMachine of cutting is not triggered under COI coordinates respectively to control to arrange
Apply u and trigger the accelerating power of the power system fired power generating unit for cutting machine control measure u；PWACC,iAnd P'WACC,iRespectively sat in COI
The accelerating power cut machine control measure u and trigger the SCIG units for cutting machine control measure u is not triggered under mark；ΔEkH(tec) it is fire
Group of motors cuts the decrement of kinetic energy after machine；ΔEkW(tec) decrement of kinetic energy after machine is cut for SCIG units；GH is in fired power generating unit
The number of generator；GW is the number of generator in SCIG units；
(4) computing formula that the transient state energy after Shedding In Power System cuts machine index I ' is：
I '=first Max or Min Δs EK(u,t)/VKE(u,t),t∈(tec,tec+Δt)；
Wherein, first Max or Min Δs EK(u, t) refers to that triggering is cut the transient state kinetic energy of power system after machine control measure u and disturbed
Dynamic item Δ EKFirst extreme value of (u, t).
5. a kind of wind power base transient state of sending outside containing different type blower fan as claimed in claim 1 cuts machine control method, its
It is characterised by：The step 4) in, the expression formula that the fuzzy transient state of the Two-Weighted-Objective containing weight coefficient cuts machine model is as follows：
In formula, β1For the transient state energy that wind power base cuts power system after machine cuts the minimum weight coefficient of machine index negative value, β2It is wind
Cut the weight coefficient of the line power oscillation damping than negative value minimum of power system after machine, λ in electric base1It is temporary to meet power system
State energy cuts the maximum satisfaction that the degree of membership of machine Con trolling index and its corresponding constraints, i.e. transient state energy cut machine Con trolling index
Degree；λ2To meet circuit on power system damping of power oscillation than target and its degree of membership of corresponding constraints, i.e. line power
Oscillation damping than maximum satisfaction, max (β1λ1+β2λ2) represent β1λ1+β2λ2Maximum；c01It is after wind power base cuts machine
The transient state energy of power system cuts machine index negative value when the transient state energy of power system cuts machine index negative value minimum；Work as wind power base
Cut power system after machine line power oscillation damping it is more minimum than negative value when, c02It is the line of power system after wind power base cuts machine
The line power oscillation damping of power system compares negative value when road damping of power oscillation is than negative value minimum；δ01It is the transient state of power system
Energy cuts the stroke of machine index negative value；δ02It is the stroke of the line power oscillation damping than negative value of power system；U is wind-powered electricity generation
Cut the voltage of all buses in power system after machine, u in baseminAnd umaxRespectively wind power base is cut after machine and is owned in power system
The higher limit and lower limit of the voltage of bus；|Pb| the size of all Line Flows in power system after machine is cut for wind power base
Value, PbmaxThe binding occurrence of all Line Flows in power system after machine is cut for wind power base.
6. a kind of wind power base transient state of sending outside containing different type blower fan as claimed in claim 5 cuts machine control method, its
It is characterised by：The step 4) in, machine model is cut to Bi-objective carries out obfuscation calculating Bi-objective of the acquisition containing weight coefficient
Weighted Fuzzy transient state cuts machine model, comprises the following steps：
(1) during carrying out cutting machine control to wind power base, machine amount decreasing value Δ P is cut by DFIG unitsw1Reduce DFIG machines
Group cuts machine amount, while cutting machine amount value added Δ P by SCIG unitsw2After increase SCIG units cut machine amount, after wind power base cuts machine
When the transient state energy of power system cuts machine index negative value minimum, the transient state energy for calculating now power system cuts machine index negative value c01
With line power oscillation damping than negative value c02', and now DFIG units cut machine amount and SCIG units cut machine amount；
(2) again since initially machine amount is cut, machine amount value added Δ Pw1 increase DFIG units are cut by DFIG units and cuts machine amount, together
When cut machine amount decreasing value Δ Pw2 by SCIG units and reduce after SCIG units cut machine amount, power system after wind power base cuts machine
When line power oscillation damping is more minimum than negative value, the transient state energy for calculating now power system cuts machine index negative value c01' and circuit
Damping of power oscillation is than negative value c02, and now DFIG units cut machine amount and SCIG units cut machine amount；
(3) cut machine index negative value to the transient state energy of power system and line power oscillation damping compares negative value according to cutting in machine control
It is required that difference, determine that the transient state energy of power system cuts the stroke δ of machine index negative value01With line power oscillation damping than negative
The stroke δ of value02；Wherein, transient state energy cuts the stroke δ of machine index negative value01With line power oscillation damping stretching than negative value
Contracting amount δ02Meet following condition：
c01+δ01＜ c01′；
c02+δ02＜ c02′；
(4) determine that Bi-objective cuts the target membership function mui [f of machine model1(x)] and μ [f2(x)] expression formula it is as follows：
In formula, x=[Pw1,Pw2]T, T represents transposed matrix；f1X () cuts for the transient state energy that wind power base cuts power system after machine
Machine index negative value；f2X () compares negative value for the line power oscillation damping that wind power base cuts power system after machine；
(5) cut that machine index negative value is minimum and line oscillation damping ratio according to the transient state energy that power system after machine is cut to wind power base
The different requirement of negative value two targets of minimum, determines the weight coefficient of each target, so as to obtain the fuzzy transient state of Two-Weighted-Objective
Machine model is cut, expression formula is as follows：
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