CN107565612A - A kind of active maximum control method of distributing wind-electricity integration - Google Patents

A kind of active maximum control method of distributing wind-electricity integration Download PDF

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CN107565612A
CN107565612A CN201710770725.2A CN201710770725A CN107565612A CN 107565612 A CN107565612 A CN 107565612A CN 201710770725 A CN201710770725 A CN 201710770725A CN 107565612 A CN107565612 A CN 107565612A
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mrow
msub
wind
power
voltage
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李凯嵘
景星烁
李超
康杰
蔡胜
黄琳雁
陈晞
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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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
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    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The invention discloses a kind of active maximum control method of distributing wind-electricity integration, it is characterised in that:Make the grid-connected process safety of wind field using the Reactive-power control ability of double-fed blower fan itself, avoid the wind of abandoning of wind field from rationing the power supply phenomenon, comprise the following steps：Step 1: the overvoltage mechanism after the fluctuation of wind power output and two factors of change of distribution network load, the scattered access power distribution network of analysis wind-powered electricity generation；Step 2: using the reactive power capability of double-fed fan motor unit itself, the grid-connected active maximum model of double-fed wind field is established in the case where meeting the constraint of wind power plant continuously-running；Step 3: determine the grid-connected active maximum local control strategy of consumption wind power.This method gives full play to the reactive capability of double-fed fan motor unit itself, ensure that the voltage stabilization of distributing Wind turbines grid entry point so as to realize the safety grid-connection of wind field, and maximum possible avoids the wind of abandoning of wind power plant and rationed the power supply.

Description

A kind of active maximum control method of distributing wind-electricity integration
Technical field
The invention belongs to electric power network technique field, especially suitable for the power distribution network access Double-feed wind power field containing wind power system Reactive-power control optimizes and grid entry point voltage security stability problem.
Background technology
In face of the severe challenge of energy sustainable development, the clean energy resource generating skill using wind-power electricity generation as representative is greatly developed Art has become inevitable choice.The exploitation distributing wind-powered electricity generation suited measures to local conditions simultaneously is accessed power distribution network, can not only realize wind-force Resource makes full use of, and can also fully dissolve on the spot, so as to play the horizontal work with reactive power support ability of booster tension With.
But the access of distributing wind-powered electricity generation, particularly Thief zone are incorporated into the power networks, if the control mould with reference to large-scale wind electricity unit Formula will cause grid entry point overvoltage, digestion capability to be limited, network loss increase, or even off-grid of having to.Therefore, research distributing wind-powered electricity generation Control strategy there is important theory significance and engineering practical value.
It is distributing in view of double feed wind power generator group (doubly fedinduction generator, DFIG) The main force of wind-electricity integration, people are analyzed and researched to DFIG reactive voltage characteristic, and give its idle output area. On this basis, will to the synthesis of quality of voltage, economy, via net loss etc. with reference to large-scale wind electricity system control model Ask, it is proposed that the different Reactive-power control strategy of DFIG wind power plants, theoretical direction is provided for the idle control of double-fed wind generator field.
For wind-powered electricity generation distributing access power distribution network caused by node overvoltage problem, the present invention establish make full use of DFIG without The grid-connected active maximum Controlling model of function power, and design DFIG grid-connected active maximum control strategy and Optimizing Flow.Should Control strategy scheme carries out substantial amounts of emulation testing on power system simulation software DIgSILENT in IEEE33 systems example, Result verification the inventive method ground feasibility.
The content of the invention
It is an object of the invention to provide a kind of active maximum control method of distributing wind-electricity integration.
The technical solution for realizing the object of the invention is：A kind of 1. distributing wind-electricity integration of consideration DFIG reactive power capabilities Active maximum control method, it is characterised in that can give full play to the Reactive-power control ability of double-fed blower fan itself makes the grid-connected of wind field Process is safer, avoids the wind of abandoning of wind field from rationing the power supply phenomenon, comprises the following steps：
Step 1: from the fluctuation of wind power output and two factors of change of distribution network load, analysis wind-powered electricity generation is scattered to be connect Enter the overvoltage mechanism after power distribution network.
Step 2: making full use of the reactive power capability of double-fed fan motor unit itself, meeting the pact of wind power plant continuously-running The grid-connected active maximum model of double-fed wind field is established under beam.
Step 3: propose the grid-connected active maximum local control strategy for dissolving wind power as far as possible.
Further, going out from the fluctuation of wind power output and two factors of change of distribution network load described in step 1 Hair, the scattered overvoltage mechanism accessed after power distribution network of analysis wind-powered electricity generation.Concretely comprise the following steps：
Step 1-1, the overvoltage mechanism of analysis wind-powered electricity generation distributing access power distribution network.
For ease of observation distributing wind-electricity integration point and electrical quantity, the letter of the typical distribution net of the wind power plant containing distributing is utilized Change circuit, analyzed as shown in Figure 1.
The electrical distance for making Infinite bus system to wind-electricity integration point is R+jX=Z ∠ θ, if the power of load isThe power output of distributing wind-powered electricity generation isTransmission power from power network isU1For Infinite bus system voltage, U2For wind field grid entry point voltage.
Distributing wind-electricity integration point B2Relative to B1Voltage loss be：
It can take：
The voltage change trend of grid entry point can be analyzed according to the change of distributing wind-powered electricity generation active power of output, institute Using voltage loss expression formula as：
Positive and negative (boosting, the decompression) for understanding Δ U by above formula depends primarily on 2 key elements：1. whether wind field power is more than simultaneously Site workload demand；2. power network is sent into the power-factor angle θ of grid entry point0。
1) P is worked asD＞ PW, -90 ° of ＜ θ090 ° of ＜；That is the grid-connected power of wind field is smaller, from grid side absorbed power.
If θ ＜ θ090 ° of ＜, then Δ U ＞ 0.
If 0 ° of ＜ θ0＜ θ, then Δ U ＜ 0.
If -90 ° of ＜ θ00 ° of ＜, then Δ U ＞ 0.
2) P is worked asD＜ PW, 90 ° of ＜ θ0270 ° of ＜；That is the grid-connected power of wind field is larger, to grid side input power.
If 180 ° of ＜ θ0270 ° of ＜, then Δ U ＜ 0.
If 90 ° of+θ ＜ θ0180 ° of ＜, then Δ U ＜ 0.
If 90 ° of ＜ θ090 ° of+θ of ＜, then Δ U ＞ 0.
Especially, typically requiring that wind resource is fully utilized, blower fan controls operational mode using constant power factor, Now -90 ° of ＜ θ00 ° of ＜, then Δ U ＜ 0, i.e. grid entry point voltage are higher than network head end voltage, or even beyond voltage rating 10%, there is overvoltage problem.
Certain distributing wind power plant occurs with blower fan grid connection capacity with increasing grid entry point voltage rapid increase when trying to shoot and transporting Phenomenon, up to voltage out-of-limit make blower fan have to self-insurance and off-grid accident, whole process it is as shown in Figure 2.
Further, in step 2, the reactive power capability of double-fed fan motor unit itself is made full use of, is meeting that wind power plant can The grid-connected active maximum model of double-fed wind field is established under the constraint continuously run.Concretely comprise the following steps：
Step 2-1, DFIG idle fan-out capability is analyzed.
DFIG Reactive-power control ability influenceed by rotor current excitation component, and rotor current is then by rotor windings thermoae limit Electric current and current transformer maximum current limitation, it is thus regarded that rotor maximum current value be DFIG reactive powers significant effects because Element.
When consider rotor current limitation when, stator side send and absorb reactive power capability be it is different, it is as follows：
When considering the maximum capacity of net side current transformer, the reactive power capability of its net side current transformer is as follows：
In formula：Qsmax、QgmaxWhat respectively stator side and net side current transformer were sent is maximum idle；Qsmin、QgminIt is respectively fixed Sub- side and net side current transformer absorb maximum idle；UsIt is stator voltage；PsIt is the active power of stator side output；ImaxIt is rotor The maximum current of permission；Lm、LsThe respectively excitation reactance of generator and stator equivalent reactance；ScmaxFor the appearance of net side current transformer Amount；S is revolutional slip.
So, the idle generating ability of separate unit double-fed type generating set is as follows：
The idle bound of the double-feedback aerogenerator P-Q curves obtained using aforesaid way is very big, either inhales Receipts are still sent, and its adjustable range is gradually reduced as active power increases.
Step 2-2, establish the grid-connected active maximum model of wind field.
From above-mentioned grid entry point overvoltage Analysis on Mechanism, if the grid-connected power of distributing wind field is not added with, then simultaneously Site voltage rises too fast, system consumption wind-powered electricity generation capacity very little, and blower fan is also dangerous.
Analyzed more than, can be by adjusting the power from power network transmission power in distributing wind power integration Factor angle θ0Voltage level is obtained to adjust wind field grid entry point.And byUnderstand, adjust θ0Substantially it is exactly Pass through the P of regulating wind power unitW、QW.In order to realize that wind-powered electricity generation makes full use of as far as possible, generally require to make in the case where distribution situation allows The active output of blower fan is maximum, therefore is primarily regulation and control QW。
Herein by control of the reactive power capability participation of Wind turbines to grid entry point voltage is directly utilized, it is excellent to build its control Change model：
Object function：
maxPW
Constraints：
In formula：PWmax、QWmaxThe respectively active power and reactive power auxiliary service of wind field；ξ is minimum voltage deviation.
In above-mentioned Optimized model, while maximization pursuit Wind turbines grid-connected active power maximum, wind is avoided the occurrence of Electrodispersion formula grid entry point overvoltage phenomenon.
Further, in step 3, it is proposed that dissolve the grid-connected active maximum local control of wind power as far as possible Strategy.Concretely comprise the following steps：
Step 3-1, set the voltage range under wind power plant difference running status.
When output of wind electric field is smaller, active power of wind power field is sent out using wind power plant the voltage support deficiency of power distribution network Go out inductive reactive power and carry out booster tension, the power factor of wind power plant is then difficult to ensure that.For to wind power factor in the present invention The consideration of voltage landing is connected with wind power plant internal electric, is set
Text control strategy mentioned in the present invention is divided into following 3 regions according to wind farm grid-connected magnitude of voltage：
1. can steady-state operation voltage range
2. the voltage range that need to regulate and control can be run in short-term
3. the voltage range of danger operation
Distributing wind-electricity integration point voltage change interval diagram as shown in Figure 3 can be made for this.
Step 3-2, the reactive power value adjusted according to needed for each period measurement data try to achieve wind field.
Use uiRepresent the measured value in wind farm grid-connected voltage each cycle, utarThe goal of regulation and control of grid entry point voltage is represented, Wind power plant reactive power is designated as Qi。
The electrical quantity that the first two controlling cycle measures is made the difference, approximation tries to achieve grid entry point voltage and the idle change of access area Rate, target voltage values and the difference of actual voltage value are multiplied by, and then draw the demand of reactive power：
Step 3-3, draw the idiographic flow of wind farm grid-connected active maximum control strategy.
The flow of grid-connected active maximum control strategy, as shown in figure 4, comprising the following steps that：
1) according to wind field collection control operation platform, grid entry point magnitude of voltage is detected.
2) judge grid entry point voltage whetherBetween.If satisfied, then wind field operation conditions maintains stable state fortune OK；Otherwise judged next time.
If 3) uiMeetJudge to be in run the short time that section need to be regulated and controled, withFor target voltage values, The reactive power value of wind field is tried to achieve according to reactive requirement amount formula.If uiNot in section, then judge in dangerous operation electricity Between nip.
If 4) uiMeetWithFor target voltage values, try to achieve the reactive power value of wind field, otherwise with For target voltage values, obtain required idle.
5) the reactive-load compensation amount provided according to required for wind field, to adjust DFIG idle output so that voltage recover to Steady-state operation section, or regulation is until DFIG idle output limit.
Beneficial effect：Compared with prior art, its remarkable advantage is the present invention：Using double feedback electric engine wind power plant as adjustable The reactive source of section is participated in the Voltage Stability Control of grid entry point.(1) can solve conventional electrical distribution net and be difficult to voltage continuously to adjust The problem of section, and can save in expense caused by wind farm grid-connected bus installation high-capacity reactive compensation device.(2) wind is being met On the premise of electric field continuously-running, solve the problems, such as the voltage out-of-limit of other nodes of wind field grid entry point and system, and most Possibly avoid to abandon wind and abandon greatly and occur electricly.
Brief description of the drawings
Fig. 1 is the place of wind-powered electricity generation containing distributing power distribution network simplified electrical circuit diagram；
Fig. 2 is the wind farm grid-connected voltage rising of distributing and out-of-limit phenomenon figure；
Fig. 3 is wind farm grid-connected voltage range schematic diagram of distributing；
Fig. 4 is control strategy flow chart；
Fig. 5 is that wind power plant distributing accesses IEEE33 node system illustratons of model；
Fig. 6 is each periodic knot voltage's distribiuting of scene 1；
Fig. 7 is each periodic knot voltage's distribiuting of scene 2；
Fig. 8 is each periodic knot voltage's distribiuting of scene 3.
Embodiment
Below in conjunction with the accompanying drawings, subordinate list and embodiment, the invention will be further elaborated.
A kind of active maximum control method of distributing wind-electricity integration of the present invention, comprises the following steps：
Step 1: from the fluctuation of wind power output and two factors of change of distribution network load, analysis wind-powered electricity generation is scattered to be connect Enter the overvoltage mechanism after power distribution network.Concrete operation step is：
Step 1-1, the overvoltage mechanism of analysis wind-powered electricity generation distributing access power distribution network.
For ease of observation distributing wind-electricity integration point and electrical quantity, the letter of the typical distribution net of the wind power plant containing distributing is utilized Change circuit, analyzed as shown in Figure 1.
The electrical distance for making Infinite bus system to wind-electricity integration point is R+jX=Z ∠ θ, if the power of load isThe power output of distributing wind-powered electricity generation isTransmission power from power network isU1For Infinite bus system voltage, U2For wind field grid entry point voltage.
Distributing wind-electricity integration point B2Relative to B1Voltage loss be：
It can take：
The voltage change trend of grid entry point can be analyzed according to the change of distributing wind-powered electricity generation active power of output, institute Using voltage loss expression formula as：
Positive and negative (boosting, the decompression) for understanding Δ U by above formula depends primarily on 2 key elements：1. whether wind field power is more than simultaneously Site workload demand；2. power network is sent into the power-factor angle θ of grid entry point0。
1) P is worked asD＞ PW, -90 ° of ＜ θ090 ° of ＜；That is the grid-connected power of wind field is smaller, from grid side absorbed power.
If θ ＜ θ090 ° of ＜, then Δ U ＞ 0.
If 0 ° of ＜ θ0＜ θ, then Δ U ＜ 0.
If -90 ° of ＜ θ00 ° of ＜, then Δ U ＞ 0.
2) P is worked asD＜ PW, 90 ° of ＜ θ0270 ° of ＜；That is the grid-connected power of wind field is larger, to grid side input power.
If 180 ° of ＜ θ0270 ° of ＜, then Δ U ＜ 0.
If 90 ° of+θ ＜ θ0180 ° of ＜, then Δ U ＜ 0.
If 90 ° of ＜ θ090 ° of+θ of ＜, then Δ U ＞ 0.
Especially, typically requiring that wind resource is fully utilized, blower fan controls operational mode using constant power factor, Now -90 ° of ＜ θ00 ° of ＜, then Δ U ＜ 0, i.e. grid entry point voltage are higher than network head end voltage, or even beyond voltage rating 10%, there is overvoltage problem.
Certain distributing wind power plant occurs with blower fan grid connection capacity with increasing grid entry point voltage rapid increase when trying to shoot and transporting Phenomenon, up to voltage out-of-limit make blower fan have to self-insurance and off-grid accident, whole process it is as shown in Figure 2.
Step 2: making full use of the Double-feed wind power unit reactive power capability of itself, grid-connected active maximum model is established, is proposed The grid-connected active maximum local control strategy of wind power is dissolved as far as possible.Concrete operation step is：
Step 2-1, DFIG idle fan-out capability is analyzed.
DFIG Reactive-power control ability influenceed by rotor current excitation component, and rotor current is then by rotor windings thermoae limit Electric current and current transformer maximum current limitation, it is thus regarded that rotor maximum current value be DFIG reactive powers significant effects because Element.
When consider rotor current limitation when, stator side send and absorb reactive power capability be it is different, it is as follows：
When considering the maximum capacity of net side current transformer, the reactive power capability of its net side current transformer is as follows：
In formula：Qsmax、QgmaxWhat respectively stator side and net side current transformer were sent is maximum idle；Qsmin、QgminIt is respectively fixed Sub- side and net side current transformer absorb maximum idle；UsIt is stator voltage；PsIt is the active power of stator side output；ImaxIt is rotor The maximum current of permission；Lm、LsThe respectively excitation reactance of generator and stator equivalent reactance；ScmaxFor the appearance of net side current transformer Amount；S is revolutional slip.
So, the idle generating ability of separate unit double-fed type generating set is as follows：
The idle bound of the double-feedback aerogenerator P-Q curves obtained using aforesaid way is very big, either inhales Receipts are still sent, and its adjustable range is gradually reduced as active power increases.
Step 2-2, establish the grid-connected active maximum model of wind field.
From above-mentioned grid entry point overvoltage Analysis on Mechanism, if the grid-connected power of distributing wind field is not added with, then simultaneously Site voltage rises too fast, system consumption wind-powered electricity generation capacity very little, and blower fan is also dangerous.
Analyzed more than, can be by adjusting the power from power network transmission power in distributing wind power integration Factor angle θ0Voltage level is obtained to adjust wind field grid entry point.And byUnderstand, adjust θ0Substantially it is exactly logical Overregulate the P of Wind turbinesW、QW.In order to realize that wind-powered electricity generation makes full use of as far as possible, generally require to make wind in the case where distribution situation allows The active output of machine is maximum, therefore is primarily regulation and control QW。
Herein by control of the reactive power capability participation of Wind turbines to grid entry point voltage is directly utilized, it is excellent to build its control Change model：
Object function：
maxPW
Constraints：
In formula：PWmax、QWmaxThe respectively active power and reactive power auxiliary service of wind field；ξ is minimum voltage deviation.
In above-mentioned Optimized model, while maximization pursuit Wind turbines grid-connected active power maximum, wind is avoided the occurrence of Electrodispersion formula grid entry point overvoltage phenomenon.
Step 3: propose the grid-connected active maximum local control strategy for dissolving wind power as far as possible.Concrete operations Step is：
Step 3-1, set the voltage range under wind power plant difference running status.
When output of wind electric field is smaller, active power of wind power field is sent out using wind power plant the voltage support deficiency of power distribution network Go out inductive reactive power and carry out booster tension, the power factor of wind power plant is then difficult to ensure that.For to wind power factor in the present invention The consideration of voltage landing is connected with wind power plant internal electric, is set
Text control strategy mentioned in the present invention is divided into following 3 regions according to wind farm grid-connected magnitude of voltage：
1. can steady-state operation voltage range
2. the voltage range that need to regulate and control can be run in short-term
3. the voltage range of danger operation
Distributing wind-electricity integration point voltage change interval diagram as shown in Figure 3 can be made for this.
Step 3-2, the reactive power value adjusted according to needed for each period measurement data try to achieve wind field.
Use uiRepresent the measured value in wind farm grid-connected voltage each cycle, utarThe goal of regulation and control of grid entry point voltage is represented, Wind power plant reactive power is designated as Qi。
The electrical quantity that the first two controlling cycle measures is made the difference, approximation tries to achieve grid entry point voltage and the idle change of access area Rate, target voltage values and the difference of actual voltage value are multiplied by, and then draw the demand of reactive power：
Step 3-3, draw the idiographic flow of wind farm grid-connected active maximum control strategy.
The flow of grid-connected active maximum control strategy, as shown in figure 4, comprising the following steps that：
1) according to wind field collection control operation platform, grid entry point magnitude of voltage is detected.
2) judge grid entry point voltage whetherBetween.If satisfied, then wind field operation conditions maintains stable state fortune OK；Otherwise judged next time.
If 3) uiMeetJudge to be in run the short time that section need to be regulated and controled, withFor target voltage values, The reactive power value of wind field is tried to achieve according to reactive requirement amount formula.If uiNot in section, then judge in dangerous operation electricity Between nip.
If 4) uiMeetWithFor target voltage values, try to achieve the reactive power value of wind field, otherwise with For target voltage values, obtain required idle.
5) the reactive-load compensation amount provided according to required for wind field, to adjust DFIG idle output so that voltage recover to Steady-state operation section, or regulation is until DFIG idle output limit.
Further detailed description is done to the present invention with reference to example：
Example 1
Using IEEE33 node systems as test example, as shown in Figure 5.Under differently running status, to grid-connected active Maximum control strategy carries out emulation testing, emulation platform DIgSILENT.
The first No. 18 node access 2*1.5MW distributing Wind turbines in 33 node systems, differently run in the system Testing and control strategy accesses 10KV distribution entoilage adjustment control effects to wind power plant distributing under state.Wherein, from low-voltage, Steady-state operation, overvoltage 3 kinds of typical operations are analyzed.
(1) parameter initialization
The wind-driven generator annual working time is 8760h, and the year maximum of China's wind power plant using the time is about 2000h, so the output normality for averagely arriving annual wind-driven generator is about a quarter of wind power plant capacity.In output of wind electric field For rated value a quarter when, change the idle output of wind power plant, the reactive voltage ratio under a normality can be measuredIt is regarded to the initial value of reactive voltage ratio.33 node in output of wind electric field 0.75MW, contribute by reactive power Increase to 0.1MVAR by 0, and be multiplied by coefficient 0.5, reactive voltage ratio can be obtainedIt is idle when coefficient is 0.8 Voltage ratio
(2) ground simulation result under different scenes
1. scene mode 1
System loading is heavier, and grid entry point voltage detecting is 0.851pu when wind power plant does not access.Wind power plant is progressively and network process In can detect grid entry point voltage be in dangerous working voltage section.Now, sets target magnitude of voltage isAccording to reactive requirement Formula tries to achieve reactive requirement value.Then by adjusting DFIG idle output, it can obtain control result as shown in table 1.
Under the control mode, each cycle each node voltage distribution situation is as shown in Figure 6.
As can be seen from Table 1, when wind power plant inspection has pressure grid-connected as 1 using power factor, wind power plant busbar voltage can not Within maintain rated voltage 10%, it will be cut off after 10s.After control strategy herein, it is believed that wind power plant is in Dangerous voltage traffic coverage, reactive power support voltage is sent using the reactive power capability of DFIG wind power plants in time, ensure that wind power plant It is incorporated into the power networks, wind power plant busbar voltage in qualified scope, obtains good with grid entry point voltage in a controlling cycle Good control effect.
2. scene mode 2
Wind speed is larger, and system voltage is horizontal overall higher, and output of wind electric field is horizontal close to rated power, system global voltage It is close or out-of-limit.Wind farm grid-connected magnitude of voltage is can detect after wind farm grid-connected, judges that wind field is in operation in short-term and needs to adjust Control voltage range.Now, sets target magnitude of voltage isReactive requirement value is drawn according to reactive requirement formula.Eventually through DFIG idle output is adjusted, can obtain control result as shown in table 2.
Under the control mode, each cycle each node voltage distribution situation is as shown in Figure 7.
As shown in table 2, can be according on the preferable traffic coverage of measurement voltage and voltage in short time voltage section, the control Limit, sends capacitive reactive power, wind power plant bus bar side voltage is returned to preferable traffic coverage, and now wind power plant within two cycles Power factor is good.
3. scene mode 3
If wind energy conversion system, which is contributed, reaches nominal output, wind power plant bus bar side and grid entry point voltage are out-of-limit during original state, In dangerous voltage section.Sets target magnitude of voltage isReactive requirement value is drawn according to reactive requirement formula.Then pass through DFIG idle output is adjusted, control result as shown in table 3 can be obtained.
Under the control mode, each cycle each node voltage distribution situation is as shown in Figure 8.
As can be seen from Table 3, when system is in underloading, when output of wind electric field is close to nominal output, caused overvoltage Problem can send capacitive reactive power by wind power plant and be addressed, and adjust rapidly, be not in the problem of wind power plant is cut off.
From numerical results as can be seen that the double-fed wind field maximum active power output scheme obtained using the present invention disclosure satisfy that Voltage stabilization security constraint of the wind power plant during power distribution network is accessed, and maximumlly dissolved wind energy resources.The present invention During going for the power system restoration containing wind power system, there is certain theory value and construction value.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation Also it should be regarded as protection scope of the present invention.
Table 1
Table 2
Table 3

Claims (4)

  1. A kind of 1. active maximum control method of distributing wind-electricity integration, it is characterised in that:Utilize the idle tune of double-fed blower fan itself Energy-conservation power makes the grid-connected process safety of wind field, avoids the wind of abandoning of wind field from rationing the power supply phenomenon, comprises the following steps：
    Step 1: from the fluctuation of wind power output and two factors of change of distribution network load, analysis wind-powered electricity generation disperses access and matched somebody with somebody Overvoltage mechanism after power network；
    Step 2: using the reactive power capability of double-fed fan motor unit itself, established in the case where meeting the constraint of wind power plant continuously-running The grid-connected active maximum model of double-fed wind field；
    Step 3: determine the grid-connected active maximum local control strategy of consumption wind power.
  2. A kind of 2. active maximum control method of distributing wind-electricity integration as claimed in claim 1, it is characterised in that institute in step 1 That states disperses after accessing power distribution network from the fluctuation of wind power output and two factors of change of distribution network load, analysis wind-powered electricity generation Overvoltage mechanism；Concretely comprise the following steps：
    Step 1-1, the overvoltage mechanism of analysis wind-powered electricity generation distributing access power distribution network：
    The electrical distance for making Infinite bus system to wind-electricity integration point is R+jX=Z ∠ θ, if the power of load isThe power output of distributing wind-powered electricity generation isTransmission power from power network isU1For Infinite bus system voltage, U2For wind field grid entry point voltage；Wherein PDIt is negative The active power of lotus point, QDFor the reactive power of load point；PWFor the active power of distributing wind power plant, QWFor distributing wind-powered electricity generation The reactive power of field；P0For the active power of grid entry point, Q0For the reactive power of grid entry point；
    Distributing wind-electricity integration point B2Relative to B1Voltage loss expression formula be：
    <mrow> <mi>&amp;Delta;</mi> <mi>U</mi> <mo>=</mo> <msub> <mi>U</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>U</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>D</mi> </msub> <mo>-</mo> <msub> <mi>P</mi> <mi>W</mi> </msub> <mo>)</mo> <mi>R</mi> <mo>&amp;CenterDot;</mo> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mo>(</mo> <msub> <mi>&amp;theta;</mi> <mn>0</mn> </msub> <mo>-</mo> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> <mrow> <msub> <mi>U</mi> <mn>2</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>cos&amp;theta;</mi> <mn>0</mn> </msub> <mo>&amp;CenterDot;</mo> <mi>cos</mi> <mi>&amp;theta;</mi> </mrow> </mfrac> </mrow>
    Analysis is carried out to above-mentioned formula and learns that the positive and negative of Δ U depends on 2 key elements：1. whether wind field power is more than grid-connected point load Demand；2. power network is sent into the power-factor angle θ of grid entry point0；
    Analysis is learnt：It is required that wind resource is fully utilized, blower fan controls operational mode using constant power factor, now- 90 ° of ＜ θ00 ° of ＜, then Δ U ＜ 0, i.e. grid entry point voltage are higher than network head end voltage, or beyond voltage rating 10%, occur Overvoltage problem.
  3. A kind of 3. active maximum control method of distributing wind-electricity integration as claimed in claim 1, it is characterised in that in step 2, Using the reactive power capability of double-fed fan motor unit itself, established in the case where meeting the constraint of wind power plant continuously-running double-fed wind field and Net active maximum model；Step includes：
    Step 2-1, DFIG idle fan-out capability is analyzed；
    When consider rotor current limitation when, stator side send and absorb reactive power capability be it is different, it is as follows：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mrow> <mi>s</mi> <mi>max</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <mrow> <mn>3</mn> <msubsup> <mi>U</mi> <mi>s</mi> <mn>2</mn> </msubsup> </mrow> <mrow> <mn>2</mn> <msub> <mi>&amp;omega;</mi> <mi>s</mi> </msub> <msub> <mi>L</mi> <mi>s</mi> </msub> </mrow> </mfrac> <mo>+</mo> <msqrt> <mrow> <msup> <mrow> <mo>(</mo> <mrow> <mfrac> <mn>3</mn> <mn>2</mn> </mfrac> <mfrac> <msub> <mi>L</mi> <mi>m</mi> </msub> <msub> <mi>L</mi> <mi>s</mi> </msub> </mfrac> <msub> <mi>U</mi> <mi>s</mi> </msub> <msub> <mi>I</mi> <mi>max</mi> </msub> </mrow> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <msubsup> <mi>P</mi> <mi>s</mi> <mn>2</mn> </msubsup> </mrow> </msqrt> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mrow> <mi>s</mi> <mi>min</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <mrow> <mn>3</mn> <msubsup> <mi>U</mi> <mi>s</mi> <mn>2</mn> </msubsup> </mrow> <mrow> <mn>2</mn> <msub> <mi>&amp;omega;</mi> <mi>s</mi> </msub> <msub> <mi>L</mi> <mi>s</mi> </msub> </mrow> </mfrac> <mo>-</mo> <msqrt> <mrow> <msup> <mrow> <mo>(</mo> <mrow> <mfrac> <mn>3</mn> <mn>2</mn> </mfrac> <mfrac> <msub> <mi>L</mi> <mi>m</mi> </msub> <msub> <mi>L</mi> <mi>s</mi> </msub> </mfrac> <msub> <mi>U</mi> <mi>s</mi> </msub> <msub> <mi>I</mi> <mi>max</mi> </msub> </mrow> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <msubsup> <mi>P</mi> <mi>s</mi> <mn>2</mn> </msubsup> </mrow> </msqrt> </mrow> </mtd> </mtr> </mtable> </mfenced>
    When considering the maximum capacity of net side current transformer, the reactive power capability of its net side current transformer is as follows：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mrow> <mi>g</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>S</mi> <mrow> <mi>c</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> <mn>2</mn> </msubsup> <mo>-</mo> <msup> <mi>s</mi> <mn>2</mn> </msup> <msubsup> <mi>P</mi> <mi>s</mi> <mn>2</mn> </msubsup> </mrow> </msqrt> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mrow> <mi>g</mi> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <msqrt> <mrow> <msubsup> <mi>S</mi> <mrow> <mi>c</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> <mn>2</mn> </msubsup> <mo>-</mo> <msup> <mi>s</mi> <mn>2</mn> </msup> <msubsup> <mi>P</mi> <mi>s</mi> <mn>2</mn> </msubsup> </mrow> </msqrt> </mrow> </mtd> </mtr> </mtable> </mfenced>
    In formula：Qsmax、QgmaxWhat respectively stator side and net side current transformer were sent is maximum idle；Qsmin、QgminRespectively stator side Absorbed with net side current transformer maximum idle；UsIt is stator voltage；PsIt is the active power of stator side output；ImaxIt is that rotor allows Maximum current；Lm、LsThe respectively excitation reactance of generator and stator equivalent reactance；ScmaxFor the capacity of net side current transformer；s For revolutional slip；
    So, the idle generating ability of separate unit double-fed type generating set is as follows：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>Q</mi> <mrow> <mi>s</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>Q</mi> <mrow> <mi>g</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mi>min</mi> </msub> <mo>=</mo> <msub> <mi>Q</mi> <mrow> <mi>s</mi> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>Q</mi> <mrow> <mi>g</mi> <mi>min</mi> </mrow> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
    The idle bound of the double-feedback aerogenerator P-Q curves obtained using aforesaid way is very big, either absorbs also It is to send, its Reactive-power control scope is gradually reduced as active power increases；
    Step 2-2, establish the grid-connected active maximum model of wind field；
    Object function：
    maxPW
    Constraints：
    <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mi>D</mi> </msub> <mo>=</mo> <msub> <mi>P</mi> <mi>D</mi> </msub> <mo>+</mo> <msub> <mi>P</mi> <mi>W</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>Q</mi> <mi>D</mi> </msub> <mo>=</mo> <msub> <mi>Q</mi> <mi>D</mi> </msub> <mo>+</mo> <msub> <mi>Q</mi> <mi>W</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mn>0</mn> <mo>&amp;le;</mo> <msub> <mi>P</mi> <mi>W</mi> </msub> <mo>&amp;le;</mo> <msub> <mi>P</mi> <mrow> <mi>W</mi> <mi>max</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>-</mo> <msub> <mi>Q</mi> <mrow> <mi>W</mi> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>&amp;le;</mo> <msub> <mi>Q</mi> <mi>W</mi> </msub> <mo>&amp;le;</mo> <msub> <mi>Q</mi> <mrow> <mi>W</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>|</mo> <mfrac> <mrow> <msub> <mi>U</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>U</mi> <mi>N</mi> </msub> </mrow> <msub> <mi>U</mi> <mi>N</mi> </msub> </mfrac> <mo>|</mo> <mo>&lt;</mo> <mi>&amp;xi;</mi> </mrow> </mtd> </mtr> </mtable> </mfenced>
    In formula：PWmax、QWmaxThe respectively active power and reactive power auxiliary service of wind field；ξ is minimum voltage deviation.
  4. A kind of 4. active maximum control method of distributing wind-electricity integration as claimed in claim 1, it is characterised in that in step 3, Propose the grid-connected active maximum local control strategy for dissolving wind power as far as possible；Step includes：
    Step 3-1, set the voltage range under wind power plant difference running status；
    Setting Control strategy mentioned in the present invention is divided into according to wind farm grid-connected magnitude of voltage 3 regions below：UNIt is a nominal base value for the rated voltage of a certain node of power network；
    1. can steady-state operation voltage range
    2. the voltage range that need to regulate and control can be run in short-term
    3. the voltage range of danger operation
    And make distributing wind-electricity integration point voltage change interval diagram；
    Step 3-2, the reactive power value adjusted according to needed for each period measurement data try to achieve wind field；
    Use uiRepresent the measured value in wind farm grid-connected voltage each cycle, utarRepresent the goal of regulation and control of grid entry point voltage, wind-powered electricity generation Field reactive power is designated as Qi；
    The electrical quantity that the first two controlling cycle measures is made the difference, approximation tries to achieve grid entry point voltage and the idle change of access area Rate, target voltage values and the difference of actual voltage value are multiplied by, and then draw the demand of reactive power：
    <mrow> <mi>&amp;Delta;</mi> <mi>Q</mi> <mo>=</mo> <mfrac> <mrow> <mo>&amp;part;</mo> <mi>Q</mi> </mrow> <mrow> <mo>&amp;part;</mo> <mi>u</mi> </mrow> </mfrac> <mrow> <mo>(</mo> <msub> <mi>u</mi> <mrow> <mi>t</mi> <mi>a</mi> <mi>r</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>u</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> </mrow>
    Step 3-3, draw the idiographic flow of wind farm grid-connected active maximum control strategy；
    The flow of grid-connected active maximum control strategy, step include：
    1) according to wind field collection control operation platform, grid entry point magnitude of voltage is detected；
    2) judge grid entry point voltage whetherBetween；If satisfied, then wind field operation conditions maintains steady-state operation；Otherwise Judged next time；
    If 3) uiMeetJudge to be in run the short time that section need to be regulated and controled, withFor target voltage values, according to Reactive requirement amount formula tries to achieve the reactive power value of wind field；If uiNot in section, then judge to be in dangerous working voltage area Between；
    If 4) uiMeetWithFor target voltage values, try to achieve the reactive power value of wind field, otherwise withFor target Magnitude of voltage, obtain required idle；
    5) the reactive-load compensation amount provided according to required for wind field, to adjust DFIG idle output so that voltage recovers to stable state Traffic coverage, or regulation is until DFIG idle output limit.
CN201710770725.2A 2017-08-31 2017-08-31 A kind of active maximum control method of distributing wind-electricity integration Withdrawn CN107565612A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108448651A (en) * 2018-03-30 2018-08-24 北京天润新能投资有限公司 A kind of the wind storage association system and control method of distributing wind-powered electricity generation
CN110544955A (en) * 2018-05-28 2019-12-06 中车株洲电力机车研究所有限公司 Operation control method and system of wind turbine generator in power grid voltage out-of-limit interval
CN111987747A (en) * 2020-07-14 2020-11-24 湖南大学 Reactive power optimization control method for large double-fed wind power plant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张晓朝等: "利用 DFIG 无功能力的分散式风电并网有功最大控制策略研究", 《中国电机工程学报》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108448651A (en) * 2018-03-30 2018-08-24 北京天润新能投资有限公司 A kind of the wind storage association system and control method of distributing wind-powered electricity generation
CN110544955A (en) * 2018-05-28 2019-12-06 中车株洲电力机车研究所有限公司 Operation control method and system of wind turbine generator in power grid voltage out-of-limit interval
CN111987747A (en) * 2020-07-14 2020-11-24 湖南大学 Reactive power optimization control method for large double-fed wind power plant

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