CN105591392A - Fan reactive power optimization method for improving economic operation of wind power farm - Google Patents

Abstract

The invention provides a fan reactive power optimization method for improving economic operation of a wind power farm. Under a wind turbine generator set constant active power control mode, the method is combined with a multi-target optimization reactive power distribution method influenced by active power loss in the wind power farm, so that the g economic operation of the wind power farm is improved; and under a wind turbine generator set constant voltage control mode, multi-target voltage fluctuation inhibition is adopted to maintain stable voltages grid connection points, and the fan reactive power adjustment capability is utilized to the largest extent. The purpose of the method is to realize economic operation of the wind power farm and inhibit voltage fluctuation; in addition, on-site data of the wind power farm is collected, a network framework model is established, and under a constant power control strategy, the power factor of the generator set is enabled to be unchanged, and the economic operation is realized by means of reactive power adjustment and control.

Description

Improve the blower fan idle work optimization method of wind energy turbine set economical operation

Technical field: the invention belongs to new forms of energy field of energy management, relate to a kind of wind that improves wind energy turbine set economical operationMachine idle work optimization method.

Background technology: along with wind turbine kludge capacity constantly increases, wind-powered electricity generation permeability is also improving constantly, due to wind energyBe a kind of intermittent energy source, the power output of wind-powered electricity generation unit depends on wind speed and direction, has randomness and non-scheduling etc.Feature, causes the electric energy that can not provide continual and steady, has caused the fluctuation of wind energy turbine set builtin voltage, causes the network loss of wind energy turbine set to increaseAffect the safe and stable operation of wind energy turbine set greatly. In order to solve power-balance, stability and the power quality problem of wind energy turbine set, mustMust be the more stable control strategy of wind power system setting, realize the Real-time Balancing of wind energy turbine set internal energy, reduce the nothing of systemMerit network loss, realizes the stable operation of wind energy turbine set.

In running of wind generating set process, the method for operation of blower fan has constant power factor, constant voltage control and permanent in power controlMake three kinds of operation strategies. The wind-powered electricity generation unit that wind energy turbine set is installed is at present variable speed constant frequency wind-powered electricity generation unit, and wherein double-fed fan motor unit hasTwo kinds of methods of operation of constant power factor and constant voltage control, its essence is Reactive Power Dispatch and the voltage control strategy to wind energy turbine setDifference, because most domestic wind field all adopts the wind-powered electricity generation unit of this kind of type, the therefore method of operation to the type unitResearch significant.

Summary of the invention:

Goal of the invention: invention provides a kind of blower fan idle work optimization method that improves wind energy turbine set economical operation, its objective is solutionCertainly existing problem in the past.

Technical scheme:

A blower fan idle work optimization method that improves wind energy turbine set economical operation, is characterized in that: the method is at wind-powered electricity generation unitThe reactive power distribution method of the multiple-objection optimization affecting in conjunction with active loss in wind energy turbine set under constant active power control model,Improve wind energy turbine set economical operation; Under wind-powered electricity generation unit constant voltage control model, adopt multiple target voltage pulsation to suppress to remain grid-connectedPoint voltage is stable, reaches the maximum utilization to the idle regulating power of blower fan.

In the AVC system of the on-the-spot operation of the method wind energy turbine set, make this system have more dominance on controlling, the method comprisesFollowing steps:

Step 1: before access distribution network system, obtain wind energy turbine set part basic data, theoretical calculating target functionIn quantitative everywhere; Based on unit parameter, build generating set Mathematical Modeling, do early-stage preparations for calculating unit loss, furtherObtain the inner each several part physical parameter of wind energy turbine set, build whole wind energy turbine set Mathematical Modeling;

Step 2: by wind energy turbine set data monitoring platform, obtain each running of wind generating set state, active power in wind energy turbine setValue, other unit real time datas of wind energy turbine set, in this process, wind energy turbine set data acquiring frequency scope is 10s～10min, extracts dataThe row filter of going forward side by side, rejects and shuts down or exist fault blower fan data; Based on real time data, set up the control of wind energy turbine set reactive Voltage OptimumModel; The wind farm grid-connected point voltage instruction of assigning according to dispatching patcher, if superior system is not assigned instruction, by master control isThe given instruction of uniting; Change and select two kinds of control models with the time scale of reactive power;

Step 3: if idle variation yardstick changes with minute/hour level time scale, unit control mode is converted to perseveranceDetermine active power control, taking wind energy turbine set economical operation as controlling target, set up object function, by number that step 1 and step 2 are obtainedIn substitution model, carry out unit without the distribution of work;

Step 4: solve object function, obtain the idle regulated value of blower fan; According to and site real-time voltage, design management streamJourney, is divided into five grades by the voltage in adjustable extent, and the idle regulated quantity that each grade is corresponding different, according to each wind-powered electricity generation unitDifferent running statuses, is assigned to corresponding wind-powered electricity generation unit by obtained reactive power value;

Step 5: if idle variation yardstick is with level time scale variation millisecond/second, unit operation pattern is switched to constantVoltage control mode; To suppress voltage pulsation as target, set up object function, by step 1 and step 2 fetched data substitution mouldIn type, carry out unit without the distribution of work;

Step 6: idle work optimization control instruction is received in each unit in wind energy turbine set, completes instruction according to self corresponding situation, holdsAfter row instruction, response and grid-connected point voltage are fed back to dispatching patcher.

In step 2, by wind energy turbine set data monitoring platform, obtain wind energy turbine set real time data and PCC point voltage control instruction,PCC point voltage fluctuation threshold values is set;

ΔU＝|U_WFcmd-U_WFout|≤ξ

In formula, U_WFcmdFor wind farm grid-connected some desired voltage values; U_WFoutFor wind farm grid-connected some real-time voltage value; ξ is windVoltage of electric field threshold value; Δ U is grid-connected point voltage deviate.

Data acquiring frequency is within 10s～10min, screens extracting data, rejects and shuts down or exist fault windMachine data; Utilize real time data, set up wind energy turbine set regulation-control model; Gather unit phase voltage, unit phase current, unit wattful powerRate, unit reactive power, one-level busbar voltage, one-level bus current, secondary busbar voltage, secondary bus current, main transformerVoltage, main transformer electric current, main transformer pressure, active power, main transformer reactive power, reactive-load compensation equipment power, retain effectivelyAfter data, enter the hind computation stage.

In described step 3, set up the idle work optimization function that is assigned as target with wind energy turbine set economic optimization

min(F)＝w₁P_loss+w₂Q_C+λ₁ΔU_i+λ₂ΔQ_i

In formula, P_lossFor wind energy turbine set active loss; Q_CFor Reactive Compensation in Wind Farm equipment investment capacity; Δ U_iFor each nodeVoltage out-of-limit value; Δ Q_iFor blower fan sends the out-of-limit value of reactive power; w₁And w₂For the weight of active power loss and reactive compensation capacity because ofSon, and w₁+w₂=1; λ is penalty factor, calculating optimal function, plays restricted problem.

In step 3, carry out analytical calculation, first calculate wind energy turbine set trend and calculate; According to wind energy turbine set reactive power at any timeBetween dimensional variation, determine air-blower control pattern, in the time of second/hour level, air-blower control mode is converted to permanent power control, calculateBlower fan, to reduce the idle adjustable nargin of network loss under target, ensures bound for objective function; Set up wind energy turbine set economyOperate to the idle control mathematical model of target, by step 1 and step 2 the data obtained, in substitution model;

The loss of wind-driven generator is mainly the copper loss of blower fan, and its expression formula is:

$P_{cu}=R_s(I_{sq}^2+I_{sd}^2)+R_r(I_{rd}^2+I_{rq}^2)$

In formula, R_sFor generator unit stator resistance, R_rFor generator amature resistance, I_sFor stator current, I_rFor rotor current;

The active loss of transformer is mainly expressed as:

P_LT＝P_O+β²P_k

In formula, P₀For transformer noload losses, P_kFor transformer load loss;

Reactive loss in transformer mainly divides two parts, i.e. field excitation branch line loss and the loss of winding leakage reactance; Wherein, excitationThe percentage value of branch road loss is substantially equal to no-load current I_OPercentage value, be about 1%～2%; In winding leakage reactance hundred of lossScore value, at transformer full load, is substantially equal to short-circuit voltage U_kPercentage value, be about 10%;

$Q_{LT}={\mathrm{\ΔQ}}_0+{\mathrm{\ΔQ}}_T\≈\frac{I_0\%}{100}{S}_N+\frac{U_k\%}{100}{\mathrm{\β}}^2{S}_N$

Transmission line of electricity is represented by ∏ shape equivalent circuit, the active loss of circuit series connection and reactive loss and the electric current passing throughSquare be directly proportional, that is:

${\mathrm{\ΔP}}_L=\frac{P_1^2+Q_1^2}{U_1^2}R$

${\mathrm{\ΔQ}}_L=\frac{P_1^2+Q_1^2}{U_1^2}X$

U₂For PCC tie point voltage in wind energy turbine set, after one section of transmission line with power distribution network prime voltage U₁Be connected; ElectricityPress U₂Relevant with active power and reactive power that access point injects; In the time that fluctuation appears in wind speed, can affect system PCC point busStablizing of voltage, due to the fluctuation of busbar voltage, can increase the network loss of wind energy turbine set, causes economic loss, when fluctuation exceedes 10%,Can exert an influence to the power output of wind energy turbine set, thus the reactive power that need to order to PCC regulate and control, thereby maintain U₂PerseveranceFixed;

Under stable situation, wind farm grid-connected operation, now wind energy turbine set, for access area power grid provides electric energy, adopts specific workThe control of rate factor, whole wind energy turbine set does not exchange reactive power with electrical network; Power system voltage regulating depends on generator, transformer and electricityNetwork parameters etc., by determining reactive requirement, regulate its stator voltage, with rotor current;

Reduce active loss as object taking wind-powered electricity generation, set up object function

P_loss＝P₁+P₂+P₃

$P_1=\underset{i=1}{\overset{n}{\Σ}}{P}_{cui}$

$P_2=\left\{\underset{i=1}{\overset{n}{\Σ}}\frac{(P_{mi}^2+Q_{mi}^2)(R_{Ti}+R_{Li})}{U_i^2}\right\}$

P₃＝P_LT

In formula, P_mi，Q_miBe respectively meritorious, the idle injection rate of i platform double-fed unit injection bus bar side; U is that case uprises pressureSide bus voltage; R_Ti，R_LiBe respectively conversion and become on high-tension side resistance and current collection line resistance to case; P₁For blower fan copper loss; P₂ForLine loss; P₃Transformer active loss.

Taking loss of wind farm minimum as principle, consider every Fans active loss, unit active loss is mainly to be determined, turnsSub-copper loss, wherein stator current is

$I_{si}^2=\frac{\sqrt{({P_i}^2+Q_i^2)}}{3U_i}$

Rotor current is

$I_{ri}=\frac{I}{X_{mi}}\sqrt{\[I_{si}^2(R_{si}^2+X_{1i}^2)+U_i^2+2U_i(\frac{P_i{R}_{si}}{3U_i}-\frac{Q_i{X}_{1i}}{3U_i})\]}$

$P_{cui}=3I_{si}^2{R}_{si}+3I_{ri}^2{R}_{ri}$

By P_cuiBe organized into about Q_iOne-place 2-th Order expression formula

$P_{cui}={\mathrm{aQ}}_i^2+{\mathrm{bQ}}_i+c$

$\left\{\begin{array}{c}a=\frac{X_{mi}^2{R}_{si}+R_{si}^2{R}_{ri}+X_{1i}^2{R}_{ri}}{3U_i^2{X}_{mi}^2}\\ b=\frac{2X_{1i}{R}_{ri}}{X_{mi}^2}\\ c=\frac{(R_{si}{X}_{mi}^2+R_{si}^2{R}_{ri}+X_{1i}^2{R}_{ri})P_i^2+6R_{si}{R}_{ri}{U}_i^2{P}_i+9R_{ri}{U}_i^4}{3X_{mi}^2{U}_i^2}\end{array}\right.$

In formula, U_iIt is the stator terminal voltage of i Fans; X_1i＝X_si+X_mi，X_2i＝X_ri+X_mi, wherein, X_si、X_m、X_riPointBe not stator leakage reactance, excitation leakage reactance and the rotor leakage reactance of i Fans;

Active loss in circuit is expressed as with reactive loss:

$P_{Li}=Q_{Li}\frac{R_i}{X_i}$

In formula, Q_LiFor connection bus in wind energy turbine set is to the reactive loss value of blower fan line concentration and case change;

In booster stations, the active loss of main transformer represents with reactive loss:

$P_{LT}=P_0+P_k(\frac{I00Q_{LT}}{S_N{U}_k\%}-\frac{I_O\%}{U_k\%})$

To sum up, propose to comprise wind energy turbine set inner blower, box type transformer, current collection circuit and main transformer at interior active power lossMinimum object function

min(F)＝w₁P_loss+w₂Q_C+λ₁ΔU_i+λ₂ΔQ_i

In formula, P_lossFor wind energy turbine set active loss; Q_CFor Reactive Compensation in Wind Farm equipment investment capacity; Δ U_iFor each nodeVoltage out-of-limit value; Δ Q_iFor blower fan sends the out-of-limit value of reactive power; w₁And w₂For the weight of active power loss and reactive compensation capacity because ofSon, and w₁+w₂=1; Be penalty factor.

Wherein the trend constraints of Optimized model is

$P_i=U_i\underset{j=1}{\overset{n}{\Σ}}{U}_j(G_{ij}{\mathrm{cos\θ}}_{ij}+B_{ij}{\mathrm{sin\θ}}_{ij})$

$Q_i=U_i\underset{j=1}{\overset{n}{\Σ}}{U}_j(G_{ij}{\mathrm{cos\θ}}_{ij}-B_{ij}{\mathrm{sin\θ}}_{ij})$

Idle equality constraint is

$\underset{i=1}{\overset{n}{\Σ}}(Q_{mi}-{\mathrm{\ΔQ}}_i)-Q_{LT}=Q_{ref}$

Inequality constraints

$0\≤P_i\≤P_{imax}^{ref}$

Q_imin≤Q_i≤Q_imax

V_i ^ref-V_i ^err≤V_i≤V_i ^ref+V_i ^err

In formula,Be that i platform unit maximum predicted is sent power, Q_imaxFor the maximum idle output valve of unit, Q_iminFor machineOrganize minimum idle output valve, V_i ^errFor node voltage fluctuation range.

In described step 4, grid-connected point voltage perunit value is divided into different brackets, is respectively U_a、U_b、U₀、U_c、U_d, with notThe busbar voltage of ad eundem, as amplitude limit, manages whole control procedure, ensures, in the process that reduces network loss, to take into account motherLine quality of voltage; Make U₀=1, there is not abnormal conditions Down Highway voltage, make U_b、U_cBe respectively U₀± 5%, make U_a、U_dPointWei U₀± 10%;

(1) work as U₂In the time of voltage magnitude bottom half;

1)U₂≤U_aTime, PCC point voltage reaches fluctuation lower limit, needs wind energy turbine set that reactive power is provided, and improves voltage, blower fan controlMode processed is converted to constant voltage control;

2)U_a≤U₂≤U_bTime, need to provide reactive power to reduce loss of wind farm, but still need reactive power to ensure electricityPress, now regulate that blower fan is idle to be output as

$Q=\frac{2U_b-U_2}{U_b}{Q}_{mi}$

3)U_b≤U₂≤U₀Time, this interval busbar voltage grade satisfies the demands, and blower fan provides reactive power to reduce network loss, thisTime regulate that blower fan is idle to be output as

Q＝Q_mi

(2) work as U₂In the time of voltage magnitude upper half, adjustment process and flow process (1) are similar.

In described step 5, set up the idle work optimization function that suppresses multiple target voltage pulsation

$Q_{ref}=K_{ref}^U(U_{mea}-U_{ref})+\underset{0}{\overset{T_{ref}^U}{\∫}}(U_{mea}-U_{ref})dt+K_{RX}\[\frac{\underset{0}{\overset{T_{\mathrm{int}}}{\∫}}(P_{avg}-P_{mea})dt}{T_{\mathrm{int}}}\]$

In formula, U_meaFor and site actual measurement voltage, U_refFor voltage reference value,For Control of Voltage gain coefficient,ForVoltage error integration time constant, K_RXFor reactive power compensation gain coefficient, T_intFor control time yardstick.

First according to voltage measured value and voltage reference value, according to blower fan constant voltage control mode, calculate in constant voltage controlUnder mode processed, the reactive requirement value of whole; Introduce voltage pulsation inhibition function simultaneously, obtain the idle reference that suppresses voltage pulsationValue, obtains final reactive requirement value, according to wind energy turbine set SCADA data, divides timing unit is carried out to reactive power, need fully examineConsider the situation of exerting oneself in real time of each unit, operation conditions, could utilize algorithm to carry out different processing to unit. This patent is rightWhen wind turbine group categories, mainly considering aspect two, is first the operation conditions of unit, in assigning process, and shouldThis is first paid the utmost attention to the bad unit of operation conditions; Secondly consider wind speed and wind power prediction result, according to wind energy turbine set unitBetween running status, unit is divided into four classes. The first kind is next period shut-down unit; Equations of The Second Kind is unit regulating power ratioThe unit that previous control cycle is strong, the 3rd class is the unit of unit regulating power a little less than than previous control cycle, the 4th class isMore than rated wind speed, the idle regulating power of unit is constant. The allocation strategy of unit is as follows.

$\underset{i=1}{\overset{n}{\Σ}}{Q}_i=Q_{ref}+Q_{loss}$

In formula, Q_refThe wind energy turbine set reactive requirement calculating for suppressing voltage pulsation; Q_lossFor wind energy turbine set reactive loss.

Q_i1＝0

$Q_{i2}=({\mathrm{\ΣQ}}_{i2,t+1}-{\mathrm{\ΣQ}}_{i2,t})\frac{Q_{i2,t}}{{\mathrm{\ΣQ}}_{i2,t+1}}+Q_{i2,t}$

$Q_{i3}=({\mathrm{\ΣQ}}_{i3,t}-{\mathrm{\ΣQ}}_{i3,t+1})\frac{Q_{i3,t+1}}{{\mathrm{\ΣQ}}_{i3,t}}+Q_{i3,t+1}$

$Q_{i4}=\frac{Q_{i4,t+1}}{{\mathrm{\ΣQ}}_{i4,t}}+Q_{i4,t+1}$

In formula, Q_ixBe the idle output valve of x class i Fans, Q_ix,tFor the idle output valve of current period, Q_ix,t+1For the idle output valve of next cycle.

Advantageous effect:

The present invention proposes a kind of blower fan idle work optimization method that improves wind energy turbine set economical operation, its objective is and realizes wind energy turbine setEconomical operation, and suppress voltage pulsation, by the collection to wind energy turbine set field data, set up network architecture model, in perseveranceUnder power control strategy, ensure that Power Factor is constant, complete economical operation by idle regulation and control. In constant voltage control planSlightly, taking the points of common connection voltage of wind-powered electricity generation unit and electrical network as controlling target, constantly regulate the idle of unit to exert oneself, coordination windThe inner reactive apparatus of electricity, suppresses voltage pulsation.

Compared with prior art, beneficial effect of the present invention is:

1. the present invention, taking wind farm grid-connected point voltage as major constraints, taking wind energy turbine set economical operation as target, is meeting tuneWhen degree command request, realize efficient operation in wind energy turbine set.

2. the present invention while fluctuating in GB allowed band, divides different electric pressures, according to electricity wind farm grid-connectedPress the zones of different operation conditions different from unit of grade to effectively reduce active power loss.

3. the present invention maintains and site reactive voltage in the instruction of assigning according to scheduling, suppresses multipoint voltage fluctuation, coordinatesRegional power grid strengthens system voltage ability of regulation and control.

4. the present invention makes full use of the fast reactive regulating power of double-fed unit, has saved wind energy turbine set is concentrated to reactive-load compensationInput, reduced wind energy turbine set operating cost, and accelerated response speed.

Brief description of the drawings:

Fig. 1 is the network topological diagram of wind energy turbine set;

Fig. 2 is control method switching flow figure;

Fig. 3 is voltage management flow chart.

Detailed description of the invention:

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Below in conjunction with accompanying drawing, the present invention is described in more detail.

Step 1: before connecting system, obtain wind energy turbine set part basic data, fixed everywhere in calculating target functionAmount.

As Fig. 1 network topological diagram that is wind energy turbine set.

Wind energy turbine set is mainly made up of wind-powered electricity generation unit, current transformer, load, reactive-load compensation equipment, transformer and power distribution network. Pass throughMonitoring site ac bus voltage, can know the fluctuation of wind energy turbine set internal communication busbar voltage. Blower fan passes through to control current transformer,Realize the switching between constant active power control and constant voltage control. Obtain wind-powered electricity generation unit stator leakage reactance, wind-powered electricity generation unit turnsSub-leakage reactance, wind-powered electricity generation DCgenerator motor field leakage reactance, wind-powered electricity generation unit stator resistance, wind turbine group rotor resistance, box type transformer floating voltage,Box type transformer short circuit current, line concentration model, the resistance of line concentration unit line, main transformer short circuit current, main transformer floating voltage data, pass through machineGroup parameter, builds generating set Mathematical Modeling, for computed losses is done early-stage preparations, and obtains the inner each several part physics of wind energy turbine setParameter, builds the topological model of whole wind energy turbine set.

Step 2: by wind energy turbine set data monitoring platform, obtain wind energy turbine set real time data and PCC point voltage control instruction,PCC point voltage fluctuation threshold values is set.

ΔU＝|U_WFcmd-U_WFout|≤ξ

In formula, U_WFcmdFor wind farm grid-connected some desired voltage values; U_WFoutFor wind farm grid-connected some real-time voltage value; ξ is windVoltage of electric field threshold value.

Data acquiring frequency is within 10s～10min, screens extracting data, rejects and shuts down or exist fault windMachine data. Utilize real time data, set up wind energy turbine set regulation-control model. Gather unit phase voltage, unit phase current, unit wattful powerRate, unit reactive power, one-level busbar voltage, one-level bus current, secondary busbar voltage, secondary bus current, main transformerVoltage, main transformer electric current, main transformer pressure, active power, main transformer reactive power, reactive-load compensation equipment power, retain effectivelyAfter data, enter the hind computation stage.

Step 3: carry out analytical calculation, first calculate wind energy turbine set trend and calculate. According to wind energy turbine set reactive power at any timeBetween dimensional variation, determine air-blower control pattern, in the time of second/hour level, air-blower control mode is converted to permanent power control, calculateBlower fan, to reduce the idle adjustable nargin of network loss under target, ensures bound for objective function. Set up wind energy turbine set economyOperate to the idle control mathematical model of target, by step 1 and step 2 the data obtained, in substitution model.

The loss of wind-driven generator is mainly the copper loss of blower fan, and its expression formula is:

$P_{cu}=R_s(I_{sq}^2+I_{sd}^2)+R_r(I_{rd}^2+I_{rq}^2)$

In formula, R_sFor generator unit stator resistance, R_rFor generator amature resistance, I_sFor stator current, I_rFor rotor current.

The active loss of transformer is mainly expressed as:

P_LT＝P_O+β²P_k

In formula, P₀For transformer noload losses, P_kFor transformer load loss.

Reactive loss in transformer mainly divides two parts, i.e. field excitation branch line loss and the loss of winding leakage reactance. Wherein, excitationThe percentage value of branch road loss is substantially equal to no-load current I_OPercentage value, be about 1%～2%; In winding leakage reactance hundred of lossScore value, at transformer full load, is substantially equal to short-circuit voltage U_kPercentage value, be about 10%.

$Q_{LT}={\mathrm{\ΔQ}}_0+{\mathrm{\ΔQ}}_T\≈\frac{I_0\%}{100}{S}_N+\frac{U_k\%}{100}{\mathrm{\β}}^2{S}_N$

Transmission line of electricity is represented by ∏ shape equivalent circuit, the active loss of circuit series connection and reactive loss and the electric current passing throughSquare be directly proportional, that is:

${\mathrm{\ΔP}}_L=\frac{P_1^2+Q_1^2}{U_1^2}R$

${\mathrm{\ΔQ}}_L=\frac{P_1^2+Q_1^2}{U_1^2}X$

For the topological structure shown in Fig. 1, U₂For PCC tie point voltage in wind energy turbine set, after one section of transmission line withPower distribution network prime voltage U₁Be connected. Voltage U₂Relevant with active power and reactive power that access point injects. When fluctuation appears in wind speedTime, can affect the stable of system PCC point busbar voltage, due to the fluctuation of busbar voltage, can increase the network loss of wind energy turbine set, cause throughJi loss, when fluctuation exceedes 10%, can exert an influence to the power output of wind energy turbine set, so the reactive power that need to order to PCCRegulate and control, thereby maintain U₂Constant.

Control method switching flow figure as shown in Figure 2.

Under stable situation, wind farm grid-connected operation, now wind energy turbine set, for access area power grid provides electric energy, adopts specific workThe control of rate factor, whole wind energy turbine set does not exchange reactive power with electrical network. Power system voltage regulating depends on generator, transformer and electricityNetwork parameters etc., by determining reactive requirement, regulate its stator voltage, with rotor current.

Reduce active loss as object taking wind-powered electricity generation, set up object function

P_loss＝P₁+P₂+P₃

$P_1=\underset{i=1}{\overset{n}{\Σ}}{P}_{cui}$

$P_2=\left\{\underset{i=1}{\overset{n}{\Σ}}\frac{(P_{mi}^2+Q_{mi}^2)(R_{Ti}+R_{Li})}{U_i^2}\right\}$

P₃＝P_LT

In formula, P_mi，Q_miBe respectively meritorious, the idle injection rate of i platform double-fed unit injection bus bar side; U is that case uprises pressureSide bus voltage; R_Ti，R_LiBe respectively conversion and become on high-tension side resistance and current collection line resistance to case.

Taking loss of wind farm minimum as principle, consider every Fans active loss, unit active loss is mainly to be determined, turnsSub-copper loss, wherein stator current is

$I_{si}^2=\frac{\sqrt{({P_i}^2+Q_i^2)}}{3U_i}$

Rotor current is

$I_{ri}=\frac{I}{X_{mi}}\sqrt{\[I_{si}^2(R_{si}^2+X_{1i}^2)+U_i^2+2U_i(\frac{P_i{R}_{si}}{3U_i}-\frac{Q_i{X}_{1i}}{3U_i})\]}$

$P_{cui}=3I_{si}^2{R}_{si}+3I_{ri}^2{R}_{ri}$

By P_cuiBe organized into about Q_iOne-place 2-th Order expression formula

$P_{cui}={\mathrm{aQ}}_i^2+{\mathrm{bQ}}_i+c$

$\left\{\begin{array}{c}a=\frac{X_{mi}^2{R}_{si}+R_{si}^2{R}_{ri}+X_{1i}^2{R}_{ri}}{3U_i^2{X}_{mi}^2}\\ b=\frac{2X_{1i}{R}_{ri}}{X_{mi}^2}\\ c=\frac{(R_{si}{X}_{mi}^2+R_{si}^2{R}_{ri}+X_{1i}^2{R}_{ri})P_i^2+6R_{si}{R}_{ri}{U}_i^2{P}_i+9R_{ri}{U}_i^4}{3X_{mi}^2{U}_i^2}\end{array}\right.$

In formula, U_iIt is the stator terminal voltage of i Fans; X_1i＝X_si+X_mi，X_2i＝X_ri+X_mi, wherein, X_si、X_m、X_riPointBe not stator leakage reactance, excitation leakage reactance and the rotor leakage reactance of i Fans.

Active loss in circuit is expressed as with reactive loss:

$P_{Li}=Q_{Li}\frac{R_i}{X_i}$

In formula, Q_LiFor connection bus in wind energy turbine set is to the reactive loss value of blower fan line concentration and case change.

In booster stations, the active loss of main transformer represents with reactive loss:

$P_{LT}=P_0+P_k(\frac{100Q_{LT}}{S_N{U}_k\%}-\frac{I_O\%}{U_k\%})$

To sum up, propose to comprise wind energy turbine set inner blower, box type transformer, current collection circuit and main transformer at interior active power lossMinimum object function

min(F)＝w₁P_loss+w₂Q_C+λ₁ΔU_i+λ₂ΔQ_i

In formula, P_lossFor wind energy turbine set active loss; Q_CFor Reactive Compensation in Wind Farm equipment investment capacity; Δ U_iFor each nodeVoltage out-of-limit value; Δ Q_iFor blower fan sends the out-of-limit value of reactive power; w₁And w₂For the weight of active power loss and reactive compensation capacity because ofSon, and w₁+w₂=1; λ is penalty factor.

Wherein the trend constraints of Optimized model is

$P_i=U_i\underset{j=1}{\overset{n}{\Σ}}{U}_j(G_{ij}{\mathrm{cos\θ}}_{ij}+B_{ij}{\mathrm{sin\θ}}_{ij})$

$Q_i=U_i\underset{j=1}{\overset{n}{\Σ}}{U}_j(G_{ij}{\mathrm{cos\θ}}_{ij}-B_{ij}{\mathrm{sin\θ}}_{ij})$

Idle equality constraint is

$\underset{i=1}{\overset{n}{\Σ}}(Q_{mi}-{\mathrm{\ΔQ}}_i)-Q_{LT}=Q_{ref}$

Inequality constraints

$0\≤P_i\≤P_{imax}^{ref}$

Q_imin≤Q_i≤Q_imax

V_i ^ref-V_i ^err≤V_i≤V_i ^ref+V_i ^err

In formula,Be that i platform unit maximum predicted is sent power, Q_imaxFor the maximum idle output valve of unit, Q_iminFor machineOrganize minimum idle output valve, V_i ^errFor node voltage fluctuation range.

Step 4: call PSO particle cluster algorithm calculating target function, can by the Large Scale Wind Farm Integration that contains n typhoon group of motorsTo be considered as n variable combination of particle in PSO algorithm, the idle output valve of wind power generating set can be considered variable in particleValue, target function value is considered as the fitness of PSO algorithm. The idle optimization problem of exerting oneself of wind energy turbine set double-fed wind power generator group like thisJust be converted into the optimizing problem of object function. Calculate the idle regulated value of blower fan. By management process, by adjustable extentVoltage is divided into five grades, and the idle regulated quantity that each grade is corresponding different regulates blower fan output reactive power.

Voltage management flow chart as shown in Figure 3.

Under permanent power control mode, blower fan is regulated, and then reduce the active power loss of whole wind energy turbine set. RegulatedCheng Zhong, is divided into different brackets by PCC point voltage perunit value, is respectively U_a、U_b、U₀、U_c、U_d, with the busbar voltage of different bracketsAs amplitude limit, whole control procedure is managed, ensure, in the process that reduces network loss, to take into account busbar voltage quality. OrderU₀=1, there is not abnormal conditions Down Highway voltage; Make U_b、U_cBe respectively U₀± 5%; Make U_a、U_dBe respectively U₀±10％。

(1) work as U₂In the time of voltage magnitude bottom half.

1)U₂≤U_aTime, PCC point voltage reaches fluctuation lower limit, needs wind energy turbine set that reactive power is provided, and improves voltage, blower fan controlMode processed is converted to constant voltage control.

2)U_a≤U₂≤U_bTime, need to provide reactive power to reduce loss of wind farm, but still need reactive power to ensure electricityPress, now regulate that blower fan is idle to be output as

$Q=\frac{2U_b-U_2}{U_b}{Q}_{mi}$

3)U_b≤U₂≤U₀Time, this interval busbar voltage grade satisfies the demands, and blower fan provides reactive power to reduce network loss, thisTime regulate that blower fan is idle to be output as

Q＝Q_mi

(2) work as U₂In the time of voltage magnitude upper half, adjustment process and flow process (1) are similar.

Step 5: reach millisecond/second level when wind energy turbine set reactive power changes yardstick, air-blower control switches to constant voltage controlMode. Constant voltage control lays particular emphasis on raising voltage stability, idle by following the tracks of wind farm grid-connected point voltage closed-loop control blower fanIt is zero that power maintains grid-connected point voltage fluctuation. Relative voltage fluctuation is shown below.

$\left|\frac{{\mathrm{\ΔU}}_{POI}}{U_{POI}}\right|\≈\left|\frac{{\mathrm{\ΔP}}_{POI}{R}_{POI}+{\mathrm{\ΔQ}}_{POI}{X}_{POI}}{U_{POI}^2}\right|\≈0$

In the time producing significantly power swing, need to embed voltage pulsation and suppress auxiliary and control. Many based on constant voltage controlThe idle reference value that target voltage fluctuation suppresses is:

$Q_{ref}=K_{ref}^U(U_{mea}-U_{ref})+\underset{0}{\overset{T_{ref}^U}{\∫}}(U_{mea}-U_{ref})dt+K_{RX}\[\frac{\underset{0}{\overset{T_{\mathrm{int}}}{\∫}}(P_{avg}-P_{mea})dt}{T_{\mathrm{int}}}\]$

In formula, U_meaFor and site actual measurement voltage, U_refFor voltage reference value,For Control of Voltage gain coefficient,ForVoltage error integration time constant, K_RXFor reactive power compensation gain coefficient, T_intFor control time yardstick.

First according to voltage measured value and voltage reference value, according to blower fan constant voltage control mode, calculate in constant voltage controlUnder mode processed, the reactive requirement value of whole; Introduce voltage pulsation inhibition function simultaneously, obtain the idle reference that suppresses voltage pulsationValue, obtains final reactive requirement value, obtains the idle reference value that suppresses voltage pulsation, obtains final reactive requirement value, according to windElectric field SCADA data, divide timing unit is carried out to reactive power, need take into full account the situation of exerting oneself in real time of each unit, fortuneRow situation, could utilize algorithm to carry out different processing to unit. This patent is when to wind turbine group categories, mainly two sidesFace is considered, is first the operation conditions of unit, in assigning process, and should be first preferential to the bad unit of operation conditionsConsider; Secondly consider wind speed and wind power prediction result, according to the running status between wind energy turbine set unit, unit is divided into fourClass. The first kind is next period shut-down unit; Equations of The Second Kind is the unit that unit regulating power is stronger than previous control cycle, the 3rdClass is the unit of unit regulating power a little less than than previous control cycle, and the 4th class is more than rated wind speed, unit idleRegulating power is constant. The allocation strategy of unit is as follows.

$\underset{i=1}{\overset{n}{\Σ}}{Q}_i=Q_{ref}+Q_{loss}$

In formula, Q_refThe wind energy turbine set reactive requirement calculating for suppressing voltage pulsation; Q_lossFor wind energy turbine set reactive loss.

Q_i1＝0

$Q_{i2}=({\mathrm{\ΣQ}}_{i2,t+1}-{\mathrm{\ΣQ}}_{i2,t})\frac{Q_{i2,t}}{{\mathrm{\ΣQ}}_{i2,t+1}}+Q_{i2,t}$

$Q_{i3}=({\mathrm{\ΣQ}}_{i3,t}-{\mathrm{\ΣQ}}_{i3,t+1})\frac{Q_{i3,t+1}}{{\mathrm{\ΣQ}}_{i3,t}}+Q_{i3,t+1}$

$Q_{i4}=\frac{Q_{i4,t+1}}{{\mathrm{\ΣQ}}_{i4,t}}+Q_{i4,t+1}$

In formula, Q_ixBe the idle output valve of x class i Fans, Q_ix,tFor the idle output valve of current period, Q_ix,t+1For the idle output valve of next cycle.

Step 6: in wind energy turbine set, unit is received idle work optimization control instruction, completes instruction with s own situation, and execution refers toAfter order, grid-connected point voltage is fed back to dispatching patcher.

Powerless control method provided by the invention can effectively reduce active power loss in wind energy turbine set, by two kinds of control modelsSwitch, ensured voltage stability in wind energy turbine set, reduced reactive-load compensation equipment investment, and can participate in the idle electricity of electrical networkPress and regulate, thereby improved economic benefit.

Claims (9)

1. a blower fan idle work optimization method that improves wind energy turbine set economical operation, is characterized in that: the method is in wind-powered electricity generation unit perseveranceDetermine the reactive power distribution method of the multiple-objection optimization affecting in conjunction with active loss in wind energy turbine set under active power control model, carryHigh wind energy turbine set economical operation; Under wind-powered electricity generation unit constant voltage control model, adopt multiple target voltage pulsation to suppress to maintain and siteVoltage stabilization, reaches the maximum utilization to the idle regulating power of blower fan.

2. the blower fan idle work optimization method of raising wind energy turbine set according to claim 1 economical operation, is characterized in that: the partyIn the AVC system of the on-the-spot operation of method wind energy turbine set, make this system have more dominance on controlling, the method comprises the steps:

Step 1: before access distribution network system, obtain wind energy turbine set part basic data, each in theoretical calculating target functionPlace quantitatively; Based on unit parameter, build generating set Mathematical Modeling, do early-stage preparations for calculating unit loss, further obtainThe inner each several part physical parameter of wind energy turbine set, builds whole wind energy turbine set Mathematical Modeling;

Step 2: by wind energy turbine set data monitoring platform, obtain each running of wind generating set state, active power value, wind in wind energy turbine setOther unit real time datas of electric field, in this process, wind energy turbine set data acquiring frequency scope is 10s～10min, extracts data and goes forward side by sideRow filter, rejects and shuts down or exist fault blower fan data; Based on real time data, set up wind energy turbine set reactive Voltage Optimum control mouldType; The wind farm grid-connected point voltage instruction of assigning according to dispatching patcher, if superior system is not assigned instruction, by master control systemGiven instruction; Change and select two kinds of control models with the time scale of reactive power;

Step 3: if idle variation yardstick changes with minute/hour level time scale, unit control mode is converted to and is constantly hadThe control of merit power, taking wind energy turbine set economical operation as controlling target, sets up object function, by step 1 and step 2 fetched data generationEnter in model, carry out unit without the distribution of work;

Step 4: solve object function, obtain the idle regulated value of blower fan; According to and site real-time voltage, design management flow process, willVoltage in adjustable extent is divided into five grades, and the idle regulated quantity that each grade is corresponding different, according to each wind-powered electricity generation unit differenceRunning status, obtained reactive power value is assigned to corresponding wind-powered electricity generation unit;

Step 5: if idle variation yardstick is with level time scale variation millisecond/second, unit operation pattern is switched to constant voltageControl mode; To suppress voltage pulsation as target, set up object function, by step 1 and step 2 fetched data substitution modelIn, carry out unit without the distribution of work;

Step 6: idle work optimization control instruction is received in each unit in wind energy turbine set, completes instruction according to self corresponding situation, and execution refers toAfter order, response and grid-connected point voltage are fed back to dispatching patcher.

3. the blower fan idle work optimization method of raising wind energy turbine set according to claim 2 economical operation, is characterized in that: stepIn 2, by wind energy turbine set data monitoring platform, obtain wind energy turbine set real time data and PCC point voltage control instruction, PCC point voltage is setFluctuation threshold values;

ΔU＝|U_WFcmd-U_WFout|≤ξ

In formula, U_WFcmdFor wind farm grid-connected some desired voltage values; U_WFoutFor wind farm grid-connected some real-time voltage value; ξ is wind energy turbine setVoltage threshold; Δ U is grid-connected point voltage deviate.

Data acquiring frequency is within 10s～10min, screens extracting data, rejects and shuts down or exist fault blower fan numberAccording to; Utilize real time data, set up wind energy turbine set regulation-control model; Gather unit phase voltage, unit phase current, unit active power, machineGroup reactive power, one-level busbar voltage, one-level bus current, secondary busbar voltage, secondary bus current, main transformer voltage,Main transformer electric current, main transformer pressure, active power, main transformer reactive power, reactive-load compensation equipment power, retain valid dataAfter, enter the hind computation stage.

4. the blower fan idle work optimization method of raising wind energy turbine set according to claim 2 economical operation, is characterized in that: described inIn step 3, set up the idle work optimization function that is assigned as target with wind energy turbine set economic optimization

min(F)＝w₁P_loss+w₂Q_C+λ₁ΔU_i+λ₂ΔQ_i

In formula, P_lossFor wind energy turbine set active loss; Q_CFor Reactive Compensation in Wind Farm equipment investment capacity; Δ U_iFor each node voltageOut-of-limit value; Δ Q_iFor blower fan sends the out-of-limit value of reactive power; w₁And w₂For the weight factor of active power loss and reactive compensation capacity,And w₁+w₂=1; λ is penalty factor, calculating optimal function, plays restricted problem.

5. the blower fan idle work optimization method of raising wind energy turbine set according to claim 4 economical operation, is characterized in that: stepIn 3, carry out analytical calculation, first calculate wind energy turbine set trend and calculate; According to wind energy turbine set reactive power dimensional variation in time,Determine air-blower control pattern, in the time of second/hour level, air-blower control mode is converted to permanent power control, calculate blower fan to subtractLittle network loss is the idle adjustable nargin under target, ensures bound for objective function; Setting up wind energy turbine set economical operation is targetIdle control mathematical model, by step 1 and step 2 the data obtained, in substitution model;

The loss of wind-driven generator is mainly the copper loss of blower fan, and its expression formula is:

$P_{cu}=R_s(I_{sq}^2+I_{sd}^2)+R_r(I_{rd}^2+I_{rq}^2)$

In formula, R_sFor generator unit stator resistance, R_rFor generator amature resistance, I_sFor stator current, I_rFor rotor current;

The active loss of transformer is mainly expressed as:

P_LT＝P_O+β²P_k

In formula, P₀For transformer noload losses, P_kFor transformer load loss;

Reactive loss in transformer mainly divides two parts, i.e. field excitation branch line loss and the loss of winding leakage reactance; Wherein, field excitation branch lineThe percentage value of loss is substantially equal to no-load current I_OPercentage value, be about 1%～2%; The percentage value of loss in winding leakage reactance,At transformer full load, be substantially equal to short-circuit voltage U_kPercentage value, be about 10%;

$Q_{LT}={\mathrm{\ΔQ}}_0+{\mathrm{\ΔQ}}_T\≈\frac{I_0\%}{100}{S}_N+\frac{U_k\%}{100}{\mathrm{\β}}^2{S}_N$

Transmission line of electricity is represented by ∏ shape equivalent circuit, the active loss of circuit series connection and reactive loss and the current squaring passing throughBe directly proportional, that is:

${\mathrm{\ΔP}}_L=\frac{P_1^2+Q_1^2}{U_1^2}R$

${\mathrm{\ΔQ}}_L=\frac{P_1^2+Q_1^2}{U_1^2}X$

U₂For PCC tie point voltage in wind energy turbine set, after one section of transmission line with power distribution network prime voltage U₁Be connected; Voltage U₂Relevant with active power and reactive power that access point injects; In the time that fluctuation appears in wind speed, can affect system PCC point busbar voltageStable, due to the fluctuation of busbar voltage, can increase the network loss of wind energy turbine set, cause economic loss, when fluctuation exceedes 10%, can be rightThe power output of wind energy turbine set exerts an influence, thus the reactive power that need to order to PCC regulate and control, thereby maintain U₂Constant;

Under stable situation, wind farm grid-connected operation, now wind energy turbine set for access area power grid electric energy is provided, adopt unit power because ofNumerical control system, whole wind energy turbine set does not exchange reactive power with electrical network; Power system voltage regulating depends on generator, transformer and electrical network ginsengNumbers etc., by determining reactive requirement, regulate its stator voltage, with rotor current;

Reduce active loss as object taking wind-powered electricity generation, set up object function

P_loss＝P₁+P₂+P₃

$P_1=\underset{i=1}{\overset{n}{\Σ}}{P}_{cui}$

$P_2=\left\{\underset{i=1}{\overset{n}{\Σ}}\frac{(P_{mi}^2+Q_{mi}^2)(R_{Ti}+R_{Li})}{U_i^2}\right\}$

P₃＝P_LT

In formula, P_mi，Q_miBe respectively meritorious, the idle injection rate of i platform double-fed unit injection bus bar side; U is that case becomes high-pressure side motherLine voltage; R_Ti，R_LiBe respectively conversion and become on high-tension side resistance and current collection line resistance to case; P₁For blower fan copper loss; P₂For circuitLoss; P₃Transformer active loss.

Taking loss of wind farm minimum as principle, consider every Fans active loss, unit active loss is mainly stator and rotor copperConsumption, wherein stator current is

$I_{si}^2=\frac{\sqrt{({P_i}^2+Q_i^2)}}{3U_i}$

Rotor current is

$I_{ri}=\frac{1}{X_{mi}}\sqrt{\[I_{si}^2(R_{si}^2+X_{1i}^2)+U_i^2+2U_i(\frac{P_i{R}_{si}}{3U_i}-\frac{Q_i{X}_{1i}}{3U_i})\]}$

$P_{cui}=3I_{si}^2{R}_{si}+3I_{ri}^2{R}_{ri}$

By P_cuiBe organized into about Q_iOne-place 2-th Order expression formula

$P_{cui}={\mathrm{aQ}}_i^2+{\mathrm{bQ}}_i+c$

$\left\{\begin{array}{c}a=\frac{X_{mi}^2{R}_{si}+R_{si}^2{R}_{ri}+X_{1i}^2{R}_{ri}}{3U_i^2{X}_{mi}^2}\\ b=\frac{2X_{1i}{R}_{ri}}{X_{mi}^2}\\ c=\frac{\left(R_{si}{X}_{mi}^2+R_{si}^2{R}_{ri}+X_{1i}^2{R}_{ri}\right)P_i^2+6R_{si}{R}_{ri}{U}_i^2{P}_i+9R_{ri}{U}_i^4}{3X_{mi}^2{U}_i^2}\end{array}\right.$

In formula, U_iIt is the stator terminal voltage of i Fans; X_1i＝X_si+X_mi，X_2i＝X_ri+X_mi, wherein, X_si、X_m、X_riBe respectivelyStator leakage reactance, excitation leakage reactance and the rotor leakage reactance of i Fans;

Active loss in circuit is expressed as with reactive loss:

$P_{Li}=Q_{Li}\frac{R_i}{X_i}$

In formula, Q_LiFor connection bus in wind energy turbine set is to the reactive loss value of blower fan line concentration and case change;

In booster stations, the active loss of main transformer represents with reactive loss:

$P_{LT}=P_0+P_k(\frac{100Q_{LT}}{S_N{U}_k\%}-\frac{I_O\%}{U_k\%})$

To sum up, propose to comprise wind energy turbine set inner blower, box type transformer, current collection circuit and main transformer in interior active power loss minimumObject function

min(F)＝w₁P_loss+w₂Q_C+λ₁ΔU_i+λ₂ΔQ_i

In formula, P_lossFor wind energy turbine set active loss; Q_CFor Reactive Compensation in Wind Farm equipment investment capacity; Δ U_iFor each node voltageOut-of-limit value; Δ Q_iFor blower fan sends the out-of-limit value of reactive power; w₁And w₂For the weight factor of active power loss and reactive compensation capacity,And w₁+w₂=1; Be penalty factor.

6. the blower fan idle work optimization method of raising wind energy turbine set according to claim 5 economical operation, is characterized in that:

Wherein the trend constraints of Optimized model is

$P_i=U_i\underset{j=1}{\overset{n}{\Σ}}{U}_j(G_{ij}{\mathrm{cos\θ}}_{ij}+B_{ij}{\mathrm{sin\θ}}_{ij})$

$Q_i=U_i\underset{j=1}{\overset{n}{\Σ}}{U}_j(G_{ij}{\mathrm{cos\θ}}_{ij}-B_{ij}{\mathrm{sin\θ}}_{ij})$

Idle equality constraint is

$\underset{i=1}{\overset{n}{\Σ}}(Q_{mi}-{\mathrm{\ΔQ}}_i)-Q_{LT}=Q_{ref}$

$0\≤P_i\≤P_{imax}^{ref}$

Q_imin≤Q_i≤Q_imax

$V_i^{ref}-V_i^{err}\≤V_i\≤V_i^{ref}+V_i^{err}$

In formula,Be that i platform unit maximum predicted is sent power, Q_imaxFor the maximum idle output valve of unit, Q_iminFor unitLittle idle output valve,For node voltage fluctuation range.

7. the blower fan idle work optimization method of raising wind energy turbine set according to claim 2 economical operation, is characterized in that: described inIn step 4, grid-connected point voltage perunit value is divided into different brackets, is respectively U_a、U_b、U₀、U_c、U_d, with the bus of different bracketsVoltage, as amplitude limit, manages whole control procedure, ensures, in the process that reduces network loss, to take into account busbar voltage quality;Make U₀=1, there is not abnormal conditions Down Highway voltage, make U_b、U_cBe respectively U₀± 5%, make U_a、U_dBe respectively U₀±10％；

(1) work as U₂In the time of voltage magnitude bottom half;

1)U₂≤U_aTime, PCC point voltage reaches fluctuation lower limit, needs wind energy turbine set that reactive power is provided, and improves voltage, air-blower control sideFormula is converted to constant voltage control;

2)U_a≤U₂≤U_bTime, need to provide reactive power to reduce loss of wind farm, but still need reactive power to ensure voltage, thisTime regulate that blower fan is idle to be output as

$Q=\frac{2U_b-U_2}{U_b}{Q}_{mi}$

3)U_b≤U₂≤U₀Time, this interval busbar voltage grade satisfies the demands, and blower fan provides reactive power to reduce network loss, now adjustsBlower fan is idle is output as for joint

Q＝Q_mi

(2) work as U₂In the time of voltage magnitude upper half, adjustment process and flow process (1) are similar.

8. the blower fan idle work optimization method of raising wind energy turbine set according to claim 2 economical operation, is characterized in that: described inIn step 5, set up the idle work optimization function that suppresses multiple target voltage pulsation

$Q_{ref}=K_{ref}^U(U_{mea}-U_{ref})+\underset{0}{\overset{T_{ref}^U}{\∫}}(U_{mea}-U_{ref})dt+K_{RX}\[\frac{\underset{0}{\overset{T_{\mathrm{int}}}{\∫}}\left(P_{avg}-P_{mea}\right)dt}{T_{\mathrm{int}}}\]$

In formula, U_meaFor and site actual measurement voltage, U_refFor voltage reference value,For Control of Voltage gain coefficient,For voltageError intergal time constant, K_RXFor reactive power compensation gain coefficient, T_intFor control time yardstick.

9. the blower fan idle work optimization method of raising wind energy turbine set according to claim 8 economical operation, is characterized in that: firstAccording to voltage measured value and voltage reference value, according to blower fan constant voltage control mode, calculate under constant voltage control mode wholeReactive requirement value; Introduce voltage pulsation inhibition function simultaneously, obtain the idle reference value that suppresses voltage pulsation, obtain final nothingMerit requirements, according to wind energy turbine set SCADA data, divide timing unit is carried out to reactive power, need take into full account each unitThe situation of exerting oneself in real time, operation conditions, could utilize algorithm to carry out different processing to unit. This patent is to wind turbine group categoriesTime, mainly consider aspect two, be first the operation conditions of unit, in assigning process, should be first to operation shapeThe bad unit of condition is paid the utmost attention to; Secondly consider wind speed and wind power prediction result, according to the operation shape between wind energy turbine set unitState, is divided into four classes by unit. The first kind is next period shut-down unit; Equations of The Second Kind is that unit regulating power is than previous control weekThe unit that phase is strong, the 3rd class is the unit of unit regulating power a little less than than previous control cycle, the 4th class is in rated wind speedAbove, the idle regulating power of unit is constant. The allocation strategy of unit is as follows.

$\underset{i=1}{\overset{n}{\Σ}}{Q}_i=Q_{ref}+Q_{loss}$

In formula, Q_refThe wind energy turbine set reactive requirement calculating for suppressing voltage pulsation; Q_lossFor wind energy turbine set reactive loss.

Q_i1＝0

$Q_{i2}=({\mathrm{\ΣQ}}_{i2,t+1}-{\mathrm{\ΣQ}}_{i2,t})\frac{Q_{i2,t}}{{\mathrm{\ΣQ}}_{i2,t+1}}+Q_{i2,t}$

$Q_{i3}=({\mathrm{\ΣQ}}_{i3,t}-{\mathrm{\ΣQ}}_{i3,t+1})\frac{Q_{i3,t+1}}{{\mathrm{\ΣQ}}_{i3,t}}+Q_{i3,t+1}$

$Q_{i4}=\frac{Q_{i4,t+1}}{{\mathrm{\ΣQ}}_{i4,t}}+Q_{i4,t+1}$

In formula, Q_ixBe the idle output valve of x class i Fans, Q_ix,tFor the idle output valve of current period, Q_ix,t+1For underThe idle output valve of one-period.