CN100578911C - Electric voltage idle-work fast control method of speed-changing constant frequency wind generator group wind power station - Google Patents

Abstract

A voltage reactive power fast control method for the wind power station of a variable-speed constant-frequency wind-power machine group, which comprises the following steps: 1, converting the voltage of an access node of the wind power station; 2, judging and selecting a reactive control mode; 3, establishing a reactive compensation scheme of the wind power station; 4, establishing a reactive compensation distribution scheme of the wind-power machine group; 5, sending a reactive control command; 6, triggering the next control by judging and controlling timelag. The method takes the voltage of the access node of the wind power station as an object of regulation and control; takes the steady-state operation voltage of the access node of the wind power station as a target of regulation and control; comprehensively considers the coordination between the wind power station and an electric network to carry out uniform planning of the reactive compensation of the whole wind power station, so as to lead all the machine groups in the wind power station to be capable of reasonably adjusting the reactive power, thus ensuring the reactive compensation of the whole station to be sufficient, preventing the wind-power machine group from acting frequently under the situation of real time changing of the voltage of the electric network, realizing reactive fast control and being help for maintaining the voltage stabilization of the electric network of an access area.

Description

The voltage idle-work fast control method of variable speed constant frequency wind-powered electricity generation unit wind energy turbine set

Technical field

The present invention relates to a kind of voltage idle-work fast control method of variable speed constant frequency wind-powered electricity generation unit wind energy turbine set, belong to the wind energy turbine set voltage power-less control technology field in the generation of electricity by new energy technology.

Background technology

Wind-powered electricity generation is sent out and one of the new energy technology of commercialized development prospect as on the largest scale melting, and more and more is subjected to the attention of various countries.Large-scale cluster formula wind energy turbine set is concentrated and inserted electrical network is the main application model of China's wind power generation.The most direct influence that wind energy turbine set inserts electrical network is the voltage power-less problem of access point, comprises that wind-force changes voltage fluctuation, the flickering that causes, the voltage magnitude that working conditions change causes exceeds standard, power factor is defective or the like.

At present, the usual method that solves the wind energy turbine set voltage power-less is to adopt the method for traditional reactive power compensation, promptly installs fixed capacity and reactor or SVC reactive power compensators such as (Static Var Compensator) additional in wind energy turbine set the reactive power of wind energy turbine set is carried out local compensation.Gather the real-time voltage value at the wind energy turbine set line attachment, when voltage was lower than set point, adjusting according to the voltage deviation value needed to drop into the quantity of capacitor, drops into a considerable amount of capacitors and sends capacitive reactive power, and it is idle that replenishment system lacks, and voltage is raise; Otherwise, when voltage is higher than set point, adjusts according to the voltage deviation value and need to throw the quantity of reactor, dropping into a considerable amount of reactors, to send perception idle, and the absorption system surplus is idle, and voltage is reduced.By reactive power compensator such as switched capacitor and reactor ceaselessly, realize reactive power compensation to system, keep the stability of voltage.But there is certain problem in the voltage that adopts traditional reactive-load compensation method to regulate wind energy turbine set, if adopt capacitor and reactor, response speed is slower, and square being directly proportional of compensation rate and this ground voltage, compensation capacity is big when voltage levvl is high, compensation capacity was little when voltage levvl was low, often was difficult to voltage is maintained in the permission voltage range; If adopt SVC,, in time compensate the reactive power of wind energy turbine set, but Financial cost be higher relatively though can respond the change in voltage of wind energy turbine set fast.

Continuous development along with the wind-powered electricity generation machine set technology, variable speed constant frequency wind-powered electricity generation unit becomes (mainly comprising the synchronous wind-powered electricity generation unit of double-fed asynchronous wind-powered electricity generation unit and direct-drive permanent-magnetism) mainstream model of grid connected wind power field gradually, these types adopt four-quadrant high-power electric and electronic current transformer to be connected with electrical network, control by current transformer realizes meritorious, idle decoupling zero, possesses the ability of the idle output of dynamic adjustments.Aspect the variable speed constant frequency wind-powered electricity generation unit of double-fed type, U.S. GE company has developed the idle control product of wind energy turbine set " WindVAR " at the wind-powered electricity generation unit of oneself, cooperating of electronic-controlled installation by WindVAR system and unit self, the voltage of control wind energy turbine set.

The operation principle of WindVAR system is to be control unit with GE wind-powered electricity generation unit, gather real-time status amount (magnitude of voltage of active power, reactive power and Control Node) at wind-powered electricity generation unit line attachment, and compare with the reference voltage value of setting and to obtain the real-time voltage departure, ask for real-time reactive power compensation amount through the PI controller again, compensation rate is handed down to the wind-powered electricity generation unit.The WindVAR system of GE can guarantee that wind-powered electricity generation unit output reactive power real-time tracking inserts the area power grid change in voltage, but also has two subject matters:

The first, the WindVAR system is a control unit with the wind-powered electricity generation unit, lacks to the idle unified planning of whole wind electric field the autonomous control of wind-powered electricity generation unit.Reach limit value in case some wind-powered electricity generation unit output reactive power occurs in the wind energy turbine set, each wind-powered electricity generation unit is autonomous relatively, lacks mutual cooperation, causes the reactive power compensation quantity not sufficient or the surplus of the whole audience;

The second, the wind-powered electricity generation unit regulation and control under the control of WindVAR system are too frequent.The WindVAR system has constituted the degeneration factor of whole wind electric field scope, reaches stationary value by just making wind energy turbine set outlet voltage after repeatedly regulating.During actual motion, change within the specific limits all the time owing to reasons such as load and change of wind velocity cause voltage, the wind-powered electricity generation unit certainly will will be adjusted the output reactive power incessantly, and this requirement to variable speed constant frequency wind-powered electricity generation unit current transformer is very high.

Summary of the invention

Technical problem to be solved by this invention is to overcome the problem that exists in the existing procucts, provide a kind of can be to the idle voltage idle-work fast control method that carries out the variable speed constant frequency wind-powered electricity generation unit wind energy turbine set of unified planning and distribution of variable speed constant frequency wind-powered electricity generation unit wind energy turbine set.

The technical solution adopted for the present invention to solve the technical problems is as follows: the voltage idle-work fast control method of variable speed constant frequency wind-powered electricity generation unit wind energy turbine set, in following hardware environment, move: the communication device that is connected with grid dispatching center, the communication device that is connected with wind energy turbine set outlet bus measurement mechanism, the communication device that is connected with wind-powered electricity generation unit local control unit LCU, it is characterized in that comprising the steps: one, carry out the conversion of wind energy turbine set access node real-time voltage according to (1) formula

$V_I=V_W-\frac{P_{W}R+Q_{W}X}{V_W}---\left(1\right)$

(1) in the formula, V _IBe wind energy turbine set access node real-time voltage reduced value; V _WReal-time voltage for the wind energy turbine set Egress node; P _WAnd Q _WBe respectively the active power of output and the reactive power of wind energy turbine set outlet; R and X are respectively resistance and the reactance that wind energy turbine set inserts interconnection;

Two, the voltage dead zone range that idle control is set is V _I ^B± 0.01, V _I ^BBe access node initial steady state working voltage, if $V_I^B-0.01<V_I<V_I^B+0.01,$ Control mode sign Deadflag puts 0, selects to move by the constant power factor mode of current power factor, if $V_I<V_I^B-0.01$ Or $V_I>V_I^B+0.01,$ Deadflag puts 1, the reactive power compensation amount of the wind energy turbine set of adjusting again;

Three, the different control modes of selecting according to step 2 is formulated wind energy turbine set reactive power compensation scheme;

Four, the reactive power compensation amount that obtains according to step 3 is formulated wind-powered electricity generation unit reactive power compensation amount allocative decision;

Five, form idle control command, be sent to each wind-powered electricity generation unit, finish the idle control of a wind energy turbine set;

Six, establish the control time-delay, trigger control next time, get back to step 1 by judging the control time-delay.

Wherein, the concrete steps of step 3 are:

A, judgement control mode sign Deadflag if Deadflag is 0, enter step b, if Deadflag is 1, enter step c;

B, according to formula (2) calculate wind energy turbine set output reactive power Q under the constant power factor control mode ' _W,

$Q_W^{\&prime;}=\frac{\sqrt{1-{\mathrm{\&lambda;}}^2}}{\mathrm{\&lambda;}}\&CenterDot;P_W---\left(2\right)$

(2) in the formula, λ is a power factor, obtain from wind energy turbine set bus outlet measurement mechanism,

Enter step g;

C, calculate real-time voltage departure Δ V according to formula (3)

$\mathrm{\&Delta;V}=V_I^B-V_I---\left(3\right)$

Enter steps d;

D, calculate wind energy turbine set reactive power compensation amount Δ Q according to formula (4)

ΔQ＝ΔV/S ₁ (4)

(4) in the formula, S ₁The sensitivity about wind energy turbine set output reactive power of the access node voltage that provides by grid dispatching center is provided,

Enter step e;

E, calculate according to formula (5) and press Δ Q compensation wind energy turbine set Egress node magnitude of voltage V ' afterwards _W

V′ _W＝V _W+S ₂·ΔQ (5)

(5) in the formula, S ₂The sensitivity about wind energy turbine set output reactive power of the wind energy turbine set Egress node voltage that provides by grid dispatching center is provided,

If V _W ^MaxAnd V _W ^MinBe respectively the upper and lower limit of wind energy turbine set Egress node voltage, if $V_W^{\min }<V_W<V_W^{\max },$ Directly enter step f, if $V_W<V_W^{\min }$ Or $V_W>V_W^{\max },$ Revise the reactive power compensation amount according to formula (6)

$\mathrm{\&Delta;Q}=\left\{\begin{array}{cc}(V_W^{\max }-V_W)\&CenterDot;S_2& V_W>V_W^{\max }\\ (V_W^{\min }-V_W)\&CenterDot;S_2& V_W<V_W^{\min }\end{array}\right.---\left(6\right)$

Enter step f;

F, establish Q _MaxAnd Q _MinBe respectively the upper and lower limit of the specified output reactive power of wind energy turbine set, if Q _Min-Q _g≤ Δ Q≤Q _Max-Q _g, directly enter step g, if Δ Q＜Q _Min-Q _gOr Δ Q＞Q _Max-Q _g, revise the reactive power compensation amount according to formula (7)

$\mathrm{\&Delta;Q}=\left\{\begin{array}{cc}{Q}_{\max }-Q_g& \mathrm{\&Delta;Q}>Q_{\max }-Q_g\\ Q_{\min }-Q_g& \mathrm{\&Delta;Q}<Q_{\min }-Q_g\end{array}\right.---\left(7\right)$

Enter step g;

G, obtain the reactive power compensation amount, enter step 4.

Wherein, the concrete steps of step 4 are:

A, calculate the initial idle distribution coefficient K of each typhoon group of motors according to formula (8) _i

$K_i=\frac{Q_{\mathrm{iN}}}{\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{Q}_{\mathrm{iN}}}---\left(8\right)$

(8) in the formula, Q _INSpecified reactive capability for the wind-powered electricity generation unit; M is total platform number of wind-powered electricity generation unit; Enter step b;

B, calculate the initial compensation amount Δ Q of each typhoon group of motors according to formula (9) _i

ΔQ _i＝K _i×ΔQ (9)

Enter step c;

C, establish Q _{I, max}And Q _{I, min}Be respectively the upper and lower limit of the specified output reactive power of i typhoon group of motors, if Q _{I, min}-Q _{I, g}≤ Δ Q _i≤ Q _{I, max}-Q _{I, g}, directly enter step f, if Δ Q _i＜Q _{I, min}-Q _{I, g}Or Δ Q _i＞Q _{I, max}-Q _{I, g}, ask for the actual adjustable idle Q ' of out-of-limit unit according to formula (10) _jAccount for the proportionality coefficient K ' of total reactive power compensation amount _j

$K_j^{\&prime;}=\frac{Q_j^{\&prime;}}{\mathrm{\&Delta;Q}},$ The out-of-limit unit of j ∈ (10)

Enter steps d;

D, ask for the idle distribution coefficient K ' of non-out-of-limit wind-powered electricity generation unit through revising according to formula (11) _i

$K_i^{\&prime;}=\frac{K_i(1-\underset{j}{\mathrm{\&Sigma;}}{K}_j^{\&prime;})}{1-\underset{j}{\mathrm{\&Sigma;}}{K}_j},$ The non-out-of-limit unit of i ∈, the out-of-limit unit of j ∈ (11)

Enter step e;

E, ask for non-out-of-limit wind-powered electricity generation unit reactive power compensation amount Δ Q through revising according to formula (12) _i

ΔQ _i＝K′ _i×ΔQ (12)

Enter step c;

F, obtain the reactive power compensation amount allocative decision of each typhoon group of motors, enter step 5.

Wherein, in the step 6, establish control time-delay and be t, the time lag scope of t is 0.5 second＜t＜2 second.

Beneficial effect of the present invention is as follows:

(1) this method is applicable to the wind energy turbine set voltage power-less control of grid connected wind power field mainstream model variable speed constant frequency wind-powered electricity generation unit, can be applicable to double-fed asynchronous wind-powered electricity generation unit, can be applicable to the synchronous wind-powered electricity generation unit of direct-drive permanent-magnetism again;

(2) according to inserting the reactive requirement of area power grid to wind energy turbine set, at first, in wind energy turbine set operation limited field, unified planning is carried out in reactive power compensation to the whole wind electric field, again in conjunction with the practical operation situation of each typhoon group of motors, between the wind-powered electricity generation unit, do not have the distribution of work then, make interior all units of wind energy turbine set can rationally regulate idle, guarantee the reactive power compensation of the capacity ground realization whole audience, avoid the not enough or superfluous of whole audience reactive power compensation amount;

(3) be provided with control dead area and time delay process, have only when access node voltage runs off control dead area, just can carry out idle control, otherwise the constant power factor mode by the current power factor is moved, and after the control each time, through the time-delay of certain hour, control again next time, can avoid line voltage real-time change situation leeward group of motors to move too continually, system alleviates the current transformer burden, realizes idle fast speed control;

(4) this method takes into full account the practicality of control, be in the real system between wind energy turbine set and the access node distance far away, the real-time voltage information that obtains access node from wind energy turbine set is difficult relatively, utilize the physics between wind energy turbine set Egress node electric parameters and the access node electric parameters to get in touch, real time execution information with near-end real time data conversion wind energy turbine set access node, and with wind energy turbine set access node voltage as regulation and control object, voltage steady operation value with the wind energy turbine set access node is a goal of regulation and control, associated voltage/idle the sensitivity information that utilizes the whole network operation information to extract is simultaneously adjusted to the reactive power compensation amount, take all factors into consideration the demand of operation of power networks and the mutual cooperation between wind energy turbine set and the electrical network, help to keep the stable of access area power grid voltage;

(5) this method is practical, both can be used for the comprehensive idle control of wind energy turbine set, also can be used for the idle control of separate unit wind-powered electricity generation unit.

(6) this method only needs software to realize, need not to increase hardware, Financial cost is low.

Description of drawings

Fig. 1 is the master control flow chart of the inventive method.

Fig. 2 is the algorithm flow chart of step 3 wind energy turbine set reactive power compensation solution formulation among Fig. 1.

Fig. 3 is the algorithm flow chart that step 4 wind-powered electricity generation unit reactive power compensation amount allocative decision is formulated among Fig. 1.

Fig. 4 is embodiment one a wind energy turbine set access node voltage curve.

Fig. 5 is embodiment one a wind energy turbine set Egress node voltage curve.

Fig. 6 is embodiment one a wind energy turbine set output reactive power curve chart.

Embodiment

With reference to the accompanying drawings and in conjunction with the embodiments the present invention is described in further detail.But the invention is not restricted to given example.

Example one:

The present invention is used for the voltage power-less control of double-fed asynchronous wind-powered electricity generation unit wind energy turbine set.The always meritorious capacity in this grid connected wind power field is 100MW, reactive capability is ± 33.5MVA, being 1.5MW, reactive capability by the meritorious capacity of 67 units constitutes for the double-fed asynchronous wind-powered electricity generation unit of ± 0.5MVA, the permission voltage range of wind energy turbine set Egress node is 0.9～1.1p.u., the line resistance that inserts interconnecting ties is 0.0734p.u., reactance is 0.2851p.u., adopts and carries out idle control as Fig. 1, Fig. 2 and controlled step shown in Figure 3, and control time-delay t got 1 second.During the operation of electrical network initial steady state, the virtual voltage perunit value of wind energy turbine set access node is 1.028p.u, the virtual voltage perunit value of wind energy turbine set outlet bus nodes is 1.035p.u.., and on the initial steady state working voltage value basis of wind energy turbine set access node control dead area being set is 1.018～1.038p.u. (V _I ^B± 0.01).Made wind energy turbine set access node load increase by 50% at the 11st～20 second, when wind energy turbine set access node load variations causes the access node change in voltage, access node voltage reduced value drops to 1.018p.u. in the time of the 14th second, wind energy turbine set outlet voltage is reduced to 1.03p.u., delay time after 1 second, access node voltage exceeds the control dead area scope, idle control action.Calculating the real-time voltage departure is 0.002p.u., the access node voltage that provides in the dispatching of power netwoks is 0.0724 about the sensitivity of wind energy turbine set output reactive power, the reactive power compensation amount of whole wind electric field is done a unified planning, and calculating whole wind electric field reactive power compensation amount is 2.76MVA.At first, if verification is by after this compensation rate adjustment, whether wind energy turbine set outlet voltage is qualified, the wind energy turbine set Egress node voltage that grid dispatching center provides is 0.2706 about the sensitivity of wind energy turbine set output reactive power, calculating compensation back wind energy turbine set outlet magnitude of voltage is 1.0376p.u., in wind energy turbine set Egress node voltage allowed band, directly whether the idle adjusting surplus of verification wind energy turbine set meets the demands.Because it is 0 that wind energy turbine set is initially exported reactive power, so through this time control after wind electric field output reactive power is 2.76MVA, in the specified reactive capability scope of wind energy turbine set, between the wind-powered electricity generation unit, carry out the reactive power compensation amount according to the practical operation situation of each wind-powered electricity generation unit and distribute.At first, because the idle rated capacity of 67 typhoon group of motors is identical, be 0.0149 so calculate initial idle distribution coefficient; Secondly, utilize idle distribution coefficient that wind energy turbine set reactive power compensation amount is assigned to the reactive power compensation sendout that each wind-powered electricity generation unit gets each wind-powered electricity generation unit and be 0.041MVA, the reactive power sendout of wind-powered electricity generation unit is handed down to the local control unit LCU of each typhoon group of motors in the specified reactive capability scope of each typhoon group of motors, each typhoon group of motors is adjusted the output reactive power according to instruction.Treat instruction issue finish after, need to judge through time-delay, if delay time is full, repeat whole control process.The access node voltage curve of wind energy turbine set as shown in Figure 4 in this example, though still change at 15～20 seconds loads, this method still can be effectively with wind energy turbine set access node voltage control near the 1.018p.u. of voltage dead band, to 20 seconds steady loads, the wind energy turbine set access node enters the voltage dead band, through time-delay in 1 second, switches to firm power factor mode and moves, because duty ratio had increased by 50% originally, so wind energy turbine set access node voltage finally is stabilized in 1.02p.u..Wind energy turbine set is exported idle curve as shown in Figure 5 in this example, there was not disturbance to take place at 1～10 second, wind energy turbine set output reactive power remains 0, during 11～20 seconds load variations, wind energy turbine set output reactive power changed gradually by the inventive method floating voltage and increases, and was stabilized in 0.18p.u. (18MVA) at the 22nd second, do not exceed the specified reactive capability 33.5MVA of wind energy turbine set, at this moment, every typhoon group of motors output reactive power is 0.268MVA, does not exceed the specified reactive capability 0.5MVA of wind-powered electricity generation unit.Wind energy turbine set Egress node voltage curve as shown in Figure 6 in this example, there was not disturbance at 1～10 second owing to wind energy turbine set, wind energy turbine set Egress node voltage remains unchanged, beginning load in 11 seconds changes, wind energy turbine set Egress node voltage descends, exceeded dead zone range to 14 seconds owing to wind energy turbine set access node voltage, control by the inventive method, the output reactive power of wind energy turbine set increases, wind energy turbine set Egress node voltage rises, be stabilized in 1.06p.u. at 22 seconds, do not exceed the upper limit 1.10p.u. of wind energy turbine set outlet voltage allowed band.In sum as can be known, adopt the inventive method to do unified planning to the reactive power compensation of whole wind electric field, and unify between the wind-powered electricity generation unit inside, reasonably reactive power compensation distributes, guarantee that capacity realizes the reactive power compensation of wind energy turbine set, avoid real-time tracking access node voltage to cause wind-powered electricity generation unit frequent movement, can be in wind energy turbine set be moved limited field, give full play to the idle tenability of variable speed constant frequency wind-powered electricity generation unit wind energy turbine set, wind energy turbine set access node voltage is stabilized near the initial launch voltage, helps to keep the voltage stability that wind energy turbine set inserts area power grid.

Example two:

The present invention is used for the voltage power-less control of separate unit variable speed constant frequency wind-powered electricity generation unit.

The idle control module of employing the inventive method is embedded in the control system of wind-powered electricity generation unit as the part of electrical control, the wind-powered electricity generation unit is that to be 1.5MW, reactive capability be the double-fed asynchronous wind-powered electricity generation unit of ± 0.5MVA to the meritorious capacity of unit, wind energy turbine set initial steady state working voltage is 1.028p.u., wind energy turbine set outlet initial steady state working voltage is 1.035p.u., and control dead area 1.018～1.038p.u. (V is set _I ^B± 0.01), the permission voltage range of wind-powered electricity generation unit is 0.9～1.1p.u., and the line resistance that inserts interconnecting ties is 0.0734p.u., and reactance is 0.2851p.u., and control time-delay t got 1 second.If wind speed changed at 10～40 seconds, then the reduced voltage value at the 35th second wind energy turbine set access node is 1.015p.u., exceed the voltage control dead band, calculating the real-time voltage departure is 0.013p.u., the access node voltage that provides in the dispatching of power netwoks is 0.0724 about the sensitivity of wind-powered electricity generation unit output reactive power, and calculating wind-powered electricity generation unit reactive power compensation amount is 17.9MVA.But this compensation rate exceeds the rated capacity of wind-powered electricity generation unit, so get the idle maximum 0.5MVA of wind-powered electricity generation unit, the reactive power compensation amount is handed down to the local control unit LCU of wind-powered electricity generation unit, and the wind-powered electricity generation unit is adjusted the output reactive power according to instruction.Although off-capacity, the adjusting of wind-powered electricity generation unit can help to insert area power grid recovery voltage 0.0004p.u..

The embodiment of the invention is an example with double-fed asynchronous wind-powered electricity generation unit all, is applicable to the idle control of wind energy turbine set that the direct-drive permanent-magnetism synchronous machine is formed too.

Claims (2)

1, the voltage idle-work fast control method of variable speed constant frequency wind-powered electricity generation unit wind energy turbine set, in following hardware environment, move: the communication device that is connected with grid dispatching center, the communication device that is connected with wind energy turbine set outlet bus measurement mechanism, the communication device that is connected with wind-powered electricity generation unit local control unit LCU, it is characterized in that comprising the steps: one, carry out the conversion of wind energy turbine set access node real-time voltage according to (1) formula

$V_I=V_W-\frac{P_{W}R+Q_{W}X}{V_W}---\left(1\right)$

(1) in the formula, V _IBe wind energy turbine set access node real-time voltage reduced value; V _WReal-time voltage for the wind energy turbine set Egress node; P _WAnd Q _WBe respectively the active power of output and the reactive power of wind energy turbine set outlet; R and X are respectively resistance and the reactance that wind energy turbine set inserts interconnection;

Two, the voltage dead zone range that idle control is set is V _I ^B± 0.01, V _I ^BBe access node initial steady state working voltage, if $V_I^B-0.01<V_I<V_I^B+0.01,$ Control mode sign Deadflag puts 0, selects to move by the constant power factor mode of current power factor, if $V_I<V_I^B-0.01$ Or $V_I>V_I^B+0.01,$ Deadflag puts 1, the reactive power compensation amount of the wind energy turbine set of adjusting again;

Three, the different control modes of selecting according to step 2 is formulated wind energy turbine set reactive power compensation scheme;

Four, the reactive power compensation amount that obtains according to step 3 is formulated wind-powered electricity generation unit reactive power compensation amount allocative decision;

Five, form idle control command, be sent to each wind-powered electricity generation unit, finish the idle control of a wind energy turbine set;

Six, establish the control time-delay, trigger control next time, get back to step 1 by judging the control time-delay;

The concrete steps of above-mentioned steps three are as follows:

A, judgement control mode sign Deadflag if Deadflag is 0, enter step b, if Deadflag is 1, enter step c;

B, according to formula (2) calculate wind energy turbine set output reactive power Q under the constant power factor control mode ' _W,

$Q_W^{\&prime;}=\frac{\sqrt{1-{\mathrm{\&lambda;}}^2}}{\mathrm{\&lambda;}}\&CenterDot;P_W---\left(2\right)$

(2) in the formula, λ is a power factor, obtains from wind energy turbine set bus outlet measurement mechanism, enters step g;

C, calculate real-time voltage departure Δ V according to formula (3)

$\mathrm{\&Delta;V}=V_I^B-V_I---\left(3\right)$

Enter steps d;

D, calculate wind energy turbine set reactive power compensation amount Δ Q according to formula (4)

ΔQ＝ΔV/S ₁ (4)

(4) in the formula, S ₁The sensitivity about wind energy turbine set output reactive power of the access node voltage that provides by grid dispatching center is provided,

Enter step e;

E, calculate according to formula (5) and press Δ Q compensation wind energy turbine set Egress node magnitude of voltage V ' afterwards _W

V′ _W＝V _W+S ₂·ΔQ (5)

(5) in the formula, S ₂The sensitivity about wind energy turbine set output reactive power of the wind energy turbine set Egress node voltage that provides by grid dispatching center is provided,

If V _W ^MaxAnd V _W ^MinBe respectively the upper and lower limit of wind energy turbine set Egress node voltage, if $V_W^{\min }<V_W<V_W^{\max },$ Directly enter step f, if $V_W<V_W^{\min }$ Or $V_W>V_W^{\max },$ Revise the reactive power compensation amount according to formula (6)

$\mathrm{\&Delta;Q}=\left\{\begin{array}{cc}(V_W^{\max }-V_W)\&CenterDot;S_2& V_W>V_W^{\max }\\ (V_W^{\min }-V_W)\&CenterDot;S_2& V_W<V_W^{\min }\end{array}\right.---\left(6\right)$

Enter step f;

F, establish Q _MaxAnd Q _MinBe respectively the upper and lower limit of the specified output reactive power of wind energy turbine set, if Q _Min-Q _g≤ Δ Q≤Q _Max-Q _g, directly enter step g, if Δ Q＜Q _Min-Q _gOr Δ Q＞Q _Max-Q _g, revise the reactive power compensation amount according to formula (7)

$\mathrm{\&Delta;Q}=\left\{\begin{array}{cc}{Q}_{\max }-Q_g& \mathrm{\&Delta;Q}>Q_{\max }-Q_g\\ Q_{\min }-Q_g& \mathrm{\&Delta;Q}<Q_{\min }-Q_g\end{array}\right.---\left(7\right)$

Enter step g;

G, obtain the reactive power compensation amount, enter step 4;

The concrete steps of above-mentioned steps four are as follows:

A, calculate the initial idle distribution coefficient K of each typhoon group of motors according to formula (8) _i

$K_i=\frac{Q_{\mathrm{iN}}}{\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{Q}_{\mathrm{iN}}}---\left(8\right)$

(8) in the formula, Q _INSpecified reactive capability for the wind-powered electricity generation unit; M is total platform number of wind-powered electricity generation unit;

Enter step b;

B, calculate the initial compensation amount Δ Q of each typhoon group of motors according to formula (9) _i

ΔQ _i＝K _i×ΔQ (9)

Enter step c;

C, establish Q _{I, max}And Q _{I, min}Be respectively the upper and lower limit of the specified output reactive power of i typhoon group of motors, if Q _{I, min}-Q _{I, g}≤ Δ Q _i≤ Q _{I, max}-Q _{I, g}, directly enter step f, if Δ Q _i＜Q _{I, min}-Q _{I, g}Or Δ Q _i＞Q _{I, max}-Q _{I, g}, ask for the actual adjustable idle Q ' of out-of-limit unit according to formula (10) _jAccount for the proportionality coefficient K ' of total reactive power compensation amount _j

$K_j^{\&prime;}=\frac{Q_j^{\&prime;}}{\mathrm{\&Delta;Q}},$ The out-of-limit unit of j ∈ (10)

Enter steps d;

D, ask for the idle distribution coefficient K ' of non-out-of-limit wind-powered electricity generation unit through revising according to formula (11) _i

$K_i^{\&prime;}=\frac{K_i(1-\underset{j}{\mathrm{\&Sigma;}}{K}_j^{\&prime;})}{1-\underset{j}{\mathrm{\&Sigma;}}{K}_j},$ The non-out-of-limit unit of i ∈, the out-of-limit unit of j ∈ (11)

Enter step e;

E, ask for non-out-of-limit wind-powered electricity generation unit reactive power compensation amount Δ Q through revising according to formula (12) _i

ΔQ _i＝K′ _i×ΔQ (12)

Enter step c;

F, obtain the reactive power compensation amount allocative decision of each typhoon group of motors, enter step 5.

2, the voltage idle-work fast control method of fast constant frequency wind-powered electricity generation unit wind energy turbine set according to claim 1 is characterized in that: in the step 6, establish control time-delay and be t, the time lag scope of t is 0.5 second＜t＜2 second.

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