CN101908855A - The control method of power conversion device, power conversion system and power conversion device - Google Patents

Abstract

The invention provides the control method of a kind of power conversion device, power conversion system and power conversion device, not produce the mode drive motor of the axle twisting vibration between turbine-driven generator.Be provided with in this power conversion device: variable quantity calculator (114), frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as power conversion device detect; Power calculator (115), the power of its rated output conversion equipment; And power regulator (116), it comes the action of corrected output conversion equipment so that the variation of power calculation value according to variable quantity.This power conversion device will input to power regulator (116) from the variable quantity of variable quantity calculator (114) and power calculation value from power calculator (115), in power regulator (116), the mode that changes according to variable quantity with the power calculation value will be used to make the variable corrected signal of output current of power converter to input to motor torque controller (112).At this, in the power regulator (116), output is with the ratio identical (Δ P/ Δ ω=P0/ ω 0) at the ratio of variable power and generator velocity of rotation variation and operating point place or make its mode greater than this ratio export the correction that makes output current variable.

Description

The control method of power conversion device, power conversion system and power conversion device

Technical field

The present invention relates to the control method of a kind of power conversion device, power conversion system and power conversion device, particularly a kind of control method of power conversion device, power device system and power conversion device of the axle twisting vibration that is suitable for suppressing to produce between turbine and the generator.

Background technology

About the axle twisting vibration between turbine-driven generator, in DC power-supply system, carrying out more research, for example the spy opens shown in the 2000-224896 communique, when turbine-driven generator is connected near the direct current dislocation of DC power-supply system, because the condition of the power that direct current dislocation is carried out control, and DC power-supply system and turbine-driven generator are disturbed, vibration appears in the axle of turbine-driven generator.In addition, following technology is disclosed, the axle twisting vibration is related to the state of the torque of the rotor that acts on generator, detects oscillation phenomenon according to the frequency change of the busbar voltage of direct current conversion place of DC power-supply system, and changes pilot angle and suppress a twisting vibration.

In addition, even beyond the DC power-supply system, the for example special control technology that discloses following power conversion device in the flat 11-27993 communique of opening, that is: in the power conversion device and power-supply system of Blast Furnace Top Gas Recovery Turbine Unit (TRT) as power supply that will constitute by combination of motor and generator etc., by detecting the resonance frequency component of Blast Furnace Top Gas Recovery Turbine Unit (TRT), and remove the oscillating component of circuit for eliminating Blast Furnace Top Gas Recovery Turbine Unit (TRT) by resonance frequency, suppress resonance frequency with the mechanical system of Blast Furnace Top Gas Recovery Turbine Unit (TRT) and take place to disturb and make vibration continue/increase.

[patent documentation 1] spy opens the 2000-224896 communique

[patent documentation 2] spy opens flat 11-27993 communique

At this,, adopt mostly by power converter the generated output of turbine-driven generator is converted to the technology that variable frequency is used from saving viewpoint of energy.For example, utilize motor and power conversion device to carry out the motorized of variable-ratio to the system that directly drives by machinery in the past, turbine-driven generator is set as power-supply device according to system, to be converted to the mechanical energy that to adjust once more by power conversion device and motor at this electric energy that obtains, thereby carry out variable speed drive.

Summary of the invention

The axle twisting vibration of turbine-driven generator might take place at this moment.The purpose of this invention is to provide a kind of control method that suppresses power conversion device, power conversion system and the power conversion device of turbine and the twisting vibration of generator generation axle.

To achieve these goals, power conversion device of the present invention constitutes to have: the command value calculating part, and it calculates the command value as electric physical quantity; Control part, its control transformation action makes it approach described command value; And the velocity variable calculating part, its detection is equivalent to the velocity variable of the velocity of rotation variation of described generator, the command value that described command value calculating part is calculated as follows, and this command value is carried out switching motion with the power of determining according to described velocity variable.

Perhaps constitute and have: the velocity variable calculating part, its detection is equivalent to the velocity variable of the velocity of rotation variation of described generator, described power conversion device is according to described velocity variable power controlling in switching motion, so that the electrical damping coefficient is more than zero.

Perhaps constitute and have: control part, its control transformation action; And velocity variable calculating part, its detection is equivalent to the velocity variable that the velocity of rotation of described generator changes, and the value that described power conversion device obtains after with the variable quantity of variable quantity divided by power with velocity of rotation is moved than the big mode control transformation of value that obtains after divided by power with velocity of rotation.

Perhaps constitute and have: control part, its control transformation action; Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator; And power calculation portion, its rated output, described power conversion device serves as that the mode of the power more than zero is carried out switching motion according to described detected velocity variable the described power that calculates is controlled at the electrical damping coefficient.

Perhaps constitute and have: control part, its control transformation action; And velocity variable calculating part, its detection is equivalent to the velocity variable that the velocity of rotation of described generator changes, and described power conversion device serves as that the mode of the power more than zero is carried out switching motion to be controlled to be the damping coefficient that forms in electrical system and mechanical system according to described variable quantity.

Perhaps constitute and have: the command value calculating part, it calculates the command value as electric physical quantity; Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator; The correction value calculating part, it calculates and has been used to the correction value that obtains following power and revise described command value according to described velocity variable, and this power is suppressed at the associated vibration of damping coefficient that forms in electrical system and the mechanical system; And control part, it controls electric physical quantity in the mode that approaches described revised command value.

Perhaps constitute and have: the command value calculating part, it calculates the command value as electric physical quantity; Control part, it is to approach the mode control transformation action of described command value; And velocity variable calculating part, its detection is equivalent to the velocity variable of the velocity of rotation variation of described generator, described command value calculating part, calculating is with according to described velocity variable and definite power carries out the command value of switching motion, described command value calculating part has: the oscillation phenomenon test section, and it detects the oscillation phenomenon of load-side; And restrictions, it limits described command value based on described detected oscillation phenomenon.

Perhaps a kind of power conversion system constitutes to have: the command value calculating part, and it calculates the command value of each power conversion device, and described command value is electric physical quantity; Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator; The correction calculating part, it is according to described detected velocity variable, described each power conversion device is calculated the correction value that described command value is revised respectively, so that obtain to be suppressed at the power of the associated vibration of the damping coefficient that forms in electrical system and the mechanical system; And control part, it is to approach the mode of described revised command value, the electric physical quantity of described each power conversion device of control.

Perhaps a kind of power conversion system constitutes to have: the command value calculating part, and it calculates the command value as each power conversion device of electric physical quantity; Variable quantity calculating part, its detection are equivalent to the variable quantity of the velocity of rotation variation of described generator; The command value calculating part, it is according to described detected variable quantity, to each power conversion device computations value, so that the quantity of power of the associated vibration of the damping coefficient that forms in electrical system and mechanical system of being inhibited; Restrictions, it limits described command value; And control part, it controls electric physical quantity in the mode that the electric physical quantity with described each power conversion device has approached to limit the value of described each command value.

Perhaps a kind of power conversion system constitutes in a plurality of power conversion devices and is provided with respectively: the variable quantity calculating part, and frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as described power conversion device detect; Power calculation portion, it calculates the power of described power conversion device; The power adjustment part, it revises the action of described power conversion device according to described variable quantity, so that described power calculation value changes; The correction adjustment part, it increases and decreases the correction of described power adjustment part output; And revise the restriction calculating part, and its oscillation phenomenon according to load-side is calculated the limit amount of described correction adjustment part, and described power conversion system has: the gross power calculating part, it calculates the summation of performance number of the power calculation portion of each power conversion device; The variable quantity calculating part, frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as described power conversion device detect; And the gross power adjustment part, it is according to described variable quantity, so that the mode that described gross power calculated value changes, changes the correction of any one power conversion device in the described power conversion device, to adjust as gross power.

(invention effect)

According to the present invention, as power-supply device generator is set, to suppress the axle twisting vibration between turbine and generator at this electric energy that obtains in power conversion device, to change, thereby the driving that can be used as motor etc. can be used as the variable adjustment of the mode of uses such as mechanical energy ground.

Description of drawings

Fig. 1 is the structure chart of the power conversion device of expression the 1st execution mode of the present invention.

Fig. 2 is the structure chart of the power conversion device of expression the 2nd execution mode of the present invention.

Fig. 3 is the structure chart of the power conversion device of expression the 3rd execution mode of the present invention.

Fig. 4 is the structure chart of the power conversion device of expression the 4th execution mode of the present invention.

Fig. 5 is that 2 quality of the vibrational system of expression turbine-driven generator are model framework chart.

Fig. 6 is the performance plot of expression Δ P/ Δ ω to the degree of influence of total damping coefficient.

Among the figure:

The 1-combustion gas turbine

The 2-generator

Mechanical axis between 3-combustion gas turbine and generator

4-is from the transformer of generator voltage to system voltage

5-is from the transformer of system voltage to the power converter input voltage

The 6-system

The 7-power converter

The 8-motor

The 9-driven device

Mechanical axis between 10-generator and driven device

11-power converter control device

12-power converter output current detector

13-power converter output voltage detector

14-power converter input voltage detector

111-speed command generator

112-motor torque controller

The 113-impulse generator

114-variable quantity calculator

The 115-power calculator

The 116-power regulator

117-turbine-driven generator condition enactment device

118-correction adjuster

119-revises limit calculator

Embodiment

Below, utilize accompanying drawing that the best approach that is used to carry out an invention is described.

[embodiment 1]

Fig. 1 is overall structure figure of the present invention.The 1st, combustion gas turbine, the 2nd, the mechanical energy of described combustion gas turbine 1 is converted to the generator of electric energy, combustion gas turbine 1 is combined by mechanical axis 3 with generator 2.The 4th, the output voltage of described generator 2 is converted to the transformer of system voltage, the 5th, system voltage is converted to the transformer of the input voltage of power converter, transformer 4 is connected via system 6 with transformer 5.The 7th, be the power converter of desirable power with power transfer from described transformer 5 outputs, the 8th, the power of being exported by described power converter carries out drive electric motor, the 9th, by the driven device that described motor drives, motor 8 is combined by mechanical axis 10 with driven device 9.

In addition, the 11st, operate described power converter 7 so that the power converter control device that the output torque of described motor 8 or speed satisfy desirable characteristic.Self-evident, though each inscape of power converter control device 12 is described as～device, but also can constitute the whole or a part of of power converter control device 12 by control computer, and by program realize as these～device and the function represented.The 12nd, power converter output current detector (below, be designated as current detector), the output current that detects described power converter 7 line output of going forward side by side.The 13rd, the power converter output voltage detector (below, be designated as voltage detector), it detects the output voltage of described power converter 7.The output signal of described current detector 12, voltage detector 13 is transfused to power converter control device 11, and power converter control device 11 carries out various computings, and the signal of the described power converter 7 of output function.

Next, the main action to the power converter control device describes.At first, in power converter control device 11, be transfused to motor to amount controller 112 from the speed value of speed command generator 111 output and current detection value from current detector 12 outputs, the mode that becomes desirable characteristic with the output torque or the speed of motor 8 at motor in amount controller 112 is calculated and the voltage instruction value of power output transducer 7.Particularly, be transfused to speed control 152 from the speed value of speed command generator 111 outputs and from the deviation between the speed estimating value of speed estimating calculator 151 outputs, in speed control 152, calculate and the output current command value, so that the speed estimating value is consistent with speed value.At this, input speed command value, current detection value and voltage instruction value in speed estimating calculator 151, in speed estimating calculator 151, utilize the induced voltage component of the motor that calculates from speed value, voltage instruction value, the current detection value that current controller calculates, come the presumed value of the velocity of rotation of calculating motor 8.In addition, also operating speed presumed value not sometimes, and directly detect the velocity of rotation of motor 8 by speed detector.Next, the current instruction value that calculates by speed control 152 and input to current controller 153 from the deviation between the current detection value of current detector 12 outputs, in current controller 153, calculate and the output voltage command value, so that current detection value is consistent with current instruction value.Then, described voltage instruction value is transfused to impulse generator 113, calculates and export the pulse signal of the switch element on/off that makes power converter 7 in impulse generator 113, so that the output voltage of power converter 7 is consistent with the output voltage command value.

At this, the relational expression that relates to the mains side vibration is described.Fig. 5 is to be the figure of the axle twisting vibration of expression between turbine-driven generator by 2 quality (mass), and K is a spring constant, and Dm is the damping coefficient of mechanical system, J1 is the inertia of turbine, J2 is the inertia of generator, and J is total inertia of being represented by the total of J1 and J2, and n is the ratio of inertias of J1 and J2.The damping coefficient of De electrical system, expression electrically produce the torque of the speed fluctuation minimizing that makes motor owing to be connected in the load (comprising control device) of generator.According to the state equation of 2 vibrational systems that obtain from Fig. 5, the characteristic equation of system is (1) formula.

(formula 1)

$S^3+(\frac{\mathrm{Dm}(\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">J</figure-callout>}1+J2)}{\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">J</figure-callout>}1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2}+\frac{\mathrm{De}}{J2})S^2$

$+(\frac{K(\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">J</figure-callout>}1+J2)}{\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">J</figure-callout>}1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2}+\frac{\mathrm{Dm}\&CenterDot;\mathrm{De}}{J1\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2\&CenterDot;})S+\frac{K\&CenterDot;\mathrm{De}}{J1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2}=0$ ... formula 1

The vibration characteristics of this moment by (1) formula by approximate (2), (3) formula of obtaining.

(formula 2)

$2\mathrm{\&zeta;\&omega;n}=(\mathrm{Dm}+\frac{\mathrm{<figure-callout\; id="1"\; label="De"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">De</figure-callout>}}{1+n})\&CenterDot;\frac{{(1+n)}^2}{n\&CenterDot;J}$ ... formula 2

(formula 3)

$\mathrm{\&omega;}{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">n</figure-callout>}}^2=(K+\frac{\mathrm{Dm}\&CenterDot;\mathrm{De}}{J})\&CenterDot;\frac{{(1+n)}^2}{n\&CenterDot;J}$ ... formula 3

At this, ζ is an attenuation coefficient, and ω n is the intrinsic vibration number, and n is a ratio of inertias.Total damping coefficient Ds, spring constant Ks become (4), (5) formula according to (2), (3) formula, change according to the vibration characteristics (ζ, ω n) of electrical system damping coefficient system.

(formula 4)

$\mathrm{Ds}=\mathrm{Dm}+\frac{\mathrm{<figure-callout\; id="1"\; label="De"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">De</figure-callout>}}{1+n}$ ... formula 4

(formula 5)

$\mathrm{Ks}=K+\frac{\mathrm{Dm}\&CenterDot;\mathrm{De}}{J}$ ... formula 5

Next, the electrical system damping coefficient is described.The output P of generator is represented by P=ω τ according to the velocity of rotation ω of generator and the torque tau of generator, then obtains (6) formula as if the consideration changing unit among near output type P0=ω 0 τ 0 operating point.If trying to achieve electrical system damping coefficient De (=Δ τ/Δ ω) according to (6) formula then is (7) formula.

(formula 6)

P0+ΔP＝(ω0+Δω)(τ0+Δτ)＝(ω0+Δω)Δτ+ω0·τ0+Δω·τ0

→ Δ τ=Δ P/ (ω 0+ Δ ω)-Δ ω τ 0/ (ω 0+ Δ ω) ... formula 6

(formula 7)

De=Δ τ/Δ ω=1/ ω Δ P/ Δ ω-1/ ω P0/ ω 0 ... formula 7

According to (7) formula, electrical system damping coefficient De is when carrying out firm power control (Δ P=0), if De=-1/ ω P0/ ω 0 then is a negative damping, according to the damping value of mechanical system, the total damping coefficient is the negative wild effect that produces.When the ratio that variable power changes with respect to the generator velocity of rotation is identical with the ratio at operating point place (Δ P/ Δ ω=P0/ ω 0), as if De=0, then the total damping coefficient only is the damping value of mechanical system, and oscillation phenomenon is decayed by the damping coefficient of mechanical system.In addition, the ratio that changes with respect to the generator velocity of rotation in variable power is than the ratio at operating point place greatly the time, if De＞0, then the total damping coefficient is the summation of the damping coefficient of the damping value of mechanical system and electrical system, can obtain bigger damping force.

Be conceived to above relation, next the control action among the present invention described.For utilizing (7) formula to make electrical system damping De for just, variable power must be got final product greatly than the ratio at operating point place based on the variation of generator velocity of rotation.Change or amplitude variations because the changing unit of generator velocity of rotation shows as the frequency of input voltage of power conversion device, therefore detect voltage, and its detected value is inputed to variable quantity calculator 114 by voltage detector 14.Variable quantity calculator 114 calculates the variable quantities line output of going forward side by side.In addition, be transfused to power calculator 115 by the output current of current detector 12 detected power converters and output voltage by voltage detector 13 detected power converters 7, in power calculator 115 according to voltage V, electric current I, power factor cos θ comes the power output P of rated output transducer (perhaps being called power conversion device) 7 by P=VIcos θ, and, by to power P, electric current I is carried out filtering and is calculated power P 0 as operating point (steady state value), electric current I 0, in addition, the variable power part Δ P that calculating obtains by the power P 0 that deducts from power P as operating point, the line output of going forward side by side.Then, to input to power regulator 116 with the power P 0 as operating point, electric current I 0, Δ P from the variable quantity of variable quantity calculator 114 from power calculator 115, in power regulator 116, the mode that the variation delta P that makes the power calculation value with the ratio of regulation changes according to the variation delta ω of generator velocity of rotation, for example will be used to make the variable corrected signal Δ I of output current of power converter to input to motor, with current instruction value addition from speed control 152 outputs to amount controller 112.At this, the correcting current value in the power regulator 116 is for example calculated as follows.Therefore power P tries to achieve as if near the power variation Δ P the operating point is similar to because obtain P=VIcos θ according to voltage V, electric current I, power factor cos θ, then is (8) formula.If use from the P0 as operating point, the specified rotation of generator of power calculator 115 count ω 0, factor alpha is set at Δ P/ Δ ω=α P0/ ω 0 with the Δ P/ Δ ω of regulation, then, be used for changing the correcting current value Δ I of Δ P shown in (9) formula with the ratio of regulation according to (8) formula.

(formula 8)

... formula 8

Wherein: (being approximately Δ V ≈ 0, Δ θ ≈ 0)

(formula 9)

Δ I=α (Δ ω/ω 0) P0/ (V0cos θ 0)=α (Δ ω/ω 0) I0... formula 9

At this, for example factor alpha is made as 1, by being added to according to the correcting current value Δ I that (9) formula is calculated from the current instruction value of speed control 152 outputs, the electrical system damping is 0, and it only is the characteristic of mechanical damping system that the vibration characteristics of turbogenerator can become.Have again, by factor alpha being set bigger than 1, thereby make the electrical system damping for just, the vibration performance of turbogenerator is the summation feature of mechanical damping system and electrical system damping, carries out vibration suppression thereby can obtain bigger damping force for oscillation phenomenon.In addition, when the changing unit of generator velocity of rotation is detected as the amplitude variations of the input voltage of power conversion device, also can obtain same effect by relation (Δ ω=β Δ V) substitution (9) formula with amplitude Δ V and Δ ω.

In addition, can confirm to use Δ P from power calculator 115 outputs, and become the ratio of regulation by calculating Δ P/ Δ ω, exist under the situation of deviation at ratio for regulation, also can use its departure, the correcting current value Δ I that is calculated by (9) formula is increased and decreased, thus consistent with the ratio of regulation.

In addition, in the present embodiment,, in addition,, also can realize by reducing ride gain (response) or changing voltage instruction by the combination of counting circuit though changed correcting current value Δ I energetically.

[embodiment 2]

Fig. 2 is other embodiment of apparatus of the present invention, be with Fig. 1 difference, be conceived to change with respect to the effect of the electrical system damping coefficient De of the total damping coefficient Ds mechanical condition according to turbogenerator, the relation (Δ P/ Δ ω) of employed power calculation value and variable quantity (the velocity of rotation variable quantity of generator) is variable when according to mechanical condition corrected signal to power regulator 116 outputs being calculated.In addition, only the part different with embodiment 1 described, identical part is omitted explanation.In addition, in other embodiment too.

At first, according to (2) formula, the relational expression during by De=0, the damping coefficient Dm of mechanical system is (10) formula.At this, ζ 0, ω n0 are attenuation coefficient and the intrinsic vibration numbers by the mechanical condition decision of turbine-driven generator.If derive Ds/Dm from (4) formula, (7) formula, (10) formula, then shown in (11) formula.

(formula 10)

$\mathrm{Dm}=2\mathrm{\&zeta;}0\mathrm{\&omega;n}0\&CenterDot;\frac{n\&CenterDot;J}{{(1+n)}^2}$ ... formula 10

(formula 11)

$\mathrm{Ds}/\mathrm{Dm}=1+\frac{1/\mathrm{\&omega;}(\mathrm{\&Delta;P}/\mathrm{\&Delta;\&omega;}-P0/\mathrm{\&omega;}0)}{2\mathrm{\&zeta;}0\mathrm{\&omega;n}0\&CenterDot;n/(1+n)\&CenterDot;J}$ ... formula 11

Represent among Fig. 6: according to (11) formula, ω is made as parameter with Δ P/ Δ, for example ω n0 is counted in attenuation coefficient ζ 0 and intrinsic vibration and is fixed as certain numerical value, calculates the variation of the Ds/Dm when having imported Δ P/ Δ ω and P0/ ω 0, and transverse axis is represented ratio of inertias n.Fig. 6 represents when ratio of inertias hour, because Δ P/ Δ ω can make vibration characteristics bigger variation occur.Equally, shown in (11) formula, ω n0 is counted in attenuation coefficient ζ 0, intrinsic vibration, total damping is more little, then because Δ P/ Δ ω can make vibration characteristics bigger variation occur.On the other hand, because power conversion device is that the desirable power that requires with the output loading side is purpose, the power adjustment unit of the axle twisting vibration of the pusher side that therefore is used to suppress to generate electricity becomes external disturbance, and preferably its correction is as far as possible little.Therefore, can be by the turbine-driven generator condition enactment device 117 that the mechanical condition of turbine-driven generator is set, make be used for total damping coefficient at least for negative scope in the relation of Δ P/ Δ ω of computed correction, variable in power regulator 116.

That is to say, in power regulator 116,, try to achieve the relation that total damping coefficient Ds is at least the Δ P/ Δ ω more than zero based on condition enactment information from turbine-driven generator condition enactment device 117, try to achieve the correcting current value Δ I that described relation is set up, the line output of going forward side by side by (9) formula.

So, can will be suppressed at Min. to the influence of the control performance of load-side, carry out the vibration control of mains side by as far as possible little correction by the mechanical condition of mains side.

[embodiment 3]

Fig. 3 is other embodiment of apparatus of the present invention, and the difference of itself and Fig. 1 is, the output signal of the vibration suppression function by load-side increases and decreases the corrected signal of power regulator 116 outputs.In load-side has connected power conversion device by electric motor driven driven device, existence produces the situation of axle twisting vibration with the axle resonance frequency of motor and driven device, the additional sometimes shaft vibration inhibit feature that suppresses the axle twisting vibration between motor and driven device.For example, axle twisting vibration with load-side, velocity variations as motor 8, variable quantity by the speed estimating value of speed estimating calculator 151 output detects, the load-side vibration damper 154 that output suppresses the current instruction value of this vibration is set, the output of load-side vibration damper 154 is added in the output of speed control 152.At this, when the frequency of the correction that produces when the power adjustment unit by the axle twisting vibration of the pusher side that is used to suppress to generate electricity approaches resonance frequency between motor and driven device, because with phase relation based on the corrected signal of the shaft vibration inhibit feature of load-side, lose the inhibition effect by offseting, the opposite possibility of encouraging vibration that also exists.Therefore, correction to power regulator 116 outputs increases and decreases, for example, the oscillation phenomenon (size, phase place or polarity) of the load-side that obtains according to output signal based on the correction adjuster 118 of the function of variable gain etc. and load-side vibration damper 154, the correction limit calculator 119 of calculating to the limit amount of described correction adjuster is set, by 118 pairs of correction outputs of correction adjuster based on power regulator 116, increase and decrease at total damping coefficient at least for negative scope.

That is to say, be provided with the vibrating sensor that the vibration to load-side detects indirectly, when the vibration values that correction limit calculator 119 is exported at vibrating sensor (size, phase place or polarity) is bigger than predefined vibration values, with the mode that the feasible value that makes correcting current value Δ I along with the increase of vibration values diminishes, the ratio γ (variable gain value below 1) that output limits the correcting current value.Originally, the feasible value of this correcting current value Δ I increased and decreased in for negative scope at total damping coefficient at least.

Correction adjuster 118 is revised output based on the output signal of revising limit calculator 119 in the mode that is no more than the predetermined electric current value.

So, can be within the bounds of possibility simultaneously also with the vibration suppression of load-side and the vibration suppression of mains side.

In addition, though among Fig. 3 the velocity variations of axle twisting vibration as motor 8 detected, but also the axle twisting vibration of the load-side variable quantity as the current detection value of current detector 12 output is detected sometimes, output suppresses the voltage instruction value of this vibration, and carries out the load-side vibration suppression.Under this situation, the oscillation phenomenon of the load-side that the oscillating component that comprises from the voltage instruction based on the load-side vibration suppression by basis obtains (size, phase place or polarity) increases and decreases correction, also can obtain equal effect.

[embodiment 4]

Fig. 4 is other embodiment of apparatus of the present invention, is with the difference of Fig. 3, is carried out the vibration suppression of turbine-driven generator by a plurality of power conversion devices.Though in Fig. 4, distinguish 5 to 13, have identical function by suffix a, b.In identical systems, be connected with under the situation of a plurality of power conversion devices, can carry out the vibration suppression of mains side by the summation of a plurality of power adjustment units.Therefore, mains side vibration suppression condition distributor 20 is set, to mains side vibration suppression condition distributor 20 input: the voltage detecting value of the voltage detector 14 that detects from input voltage to power converter; , from the limits value γ from correction limit calculator 119 of each power conversion device 11a, 11b... input; Correcting current value Δ I from power regulator 116; With the power P 0 as operating point, electric current I 0 and power variation Δ P from power calculator 115, the mains side vibration suppression condition (correction apportioning cost) from mains side vibration suppression condition distributor 20 each power conversion device of output.Next, the control action to mains side vibration suppression condition distributor 20 describes.In the power conversion device of a part, exist under the situation of restriction being used for the correcting current value that variation according to the generator velocity of rotation changes the power of each power conversion device, the ratio of the correcting current value by increasing other power conversion devices replenishes its influence, can adjust as gross power.Particularly, to correction distributor 204 input from each power converter control device 11a, 11b input from the limits value of revising limit calculator 119, from the correcting current value Δ I of power regulator 116, from the electric current I 0 as operating point of power calculator 115, correction apportioning cost from each power conversion device of correction distributor 204 output, for example in 2 power conversion device, applied under the situation of restriction, calculated as follows in a side.To be made as γ from the correction limit amount of each power conversion device 11a, 11b, be 1 under hard-core situation, exports with the ratio below 1 according to limit amount, is made as γ 1 with the 1st, is made as γ 2 with the 2nd.On the other hand, the correcting current value of power conversion device is calculated with (9) formula, at this moment, if similarly be made as Δ I1, I01 with the 1st, be made as Δ I2, I02 with the 2nd, then the correcting current value be depicted as identical value (each power conversion device is the situation of common α set point) as the electric current I 0 of operating point such as (12) formula.Therefore, be conceived to control the variable quantity of gross power, keep the gross power variable quantity as follows by adjusting frequency dividing ratio by the summation of the Δ I that calculates with same ratio.By making the summation under the hard-core state identical with summation under the state of having adjusted distribution ratio (apportioning cost is made as k1, k2), thereby obtain (13) formula, in that γ 2 restricted (k2=γ 2) γ 1 is unrestricted when adjusting with k1 down, try to achieve k1 by (13) formula and be (14) formula.

(formula 12)

$\frac{\mathrm{\&Delta;I}1}{I01}=\frac{\mathrm{\&Delta;I}2}{I02}=\mathrm{\&alpha;}(\mathrm{\&Delta;\&omega;}/\mathrm{\&omega;}0)$ ... formula 12

(formula 13)

$\frac{\mathrm{\&Delta;I}1}{I01}+\frac{\mathrm{\&Delta;I}2}{I02}=\frac{\mathrm{\&Delta;I}1\&CenterDot;k1}{I01}+\frac{\mathrm{\&Delta;I}2\&CenterDot;k2}{I02}$ ... formula 13

(formula 14)

$\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HSA00000133614500051.png"\; state="\{\{state\}\}">k</figure-callout>}1=1+\frac{I01\&CenterDot;\mathrm{\&Delta;I}2}{\mathrm{\&Delta;I}1\&CenterDot;I02}\&CenterDot;(1-k2)=2-\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">K</figure-callout>}2$ ... formula 14

Thereby (distribute in the scope of 1＜k1＜2 by=k2) limit amount according to γ 2 for k1.In addition, even under the situation that also increases the platform number, also can keep the variable quantity of gross power by adjust the distribution ratio of (increase) unrestricted power conversion device in the mode of setting up with the same relation of (13) formula.

Next, the control action to gross power adjuster 203 describes.For make electrical system damping De by (7) formula for just, as long as change power according to the variation of generator velocity of rotation.Change or amplitude variations because the changing unit of generator velocity of rotation shows as the frequency of input voltage of power conversion device, therefore detect voltage, its detected value is inputed to variable quantity calculator 201 by voltage detector 14.Variable quantity calculator 201 calculates and the output variable quantity.In addition, from each power converter control device 11a, 11b ... power calculation value P and power variation Δ P be transfused to total power calculator 202.In total power calculator 202, calculate and export the power output of a plurality of power converters and the summation of variation.At this, in gross power adjuster 203, under the identical situation of the ratio at ratio that the variable power of gross power calculated value and generator velocity of rotation change and operating point place (Δ P/ Δ ω=P0/ ω 0), if De=0, then the total damping coefficient only is the damping value of mechanical system, and oscillation phenomenon is decayed by the damping coefficient of mechanical system.In addition, under the ratio situation greatly of ratio than operating point place that variable power and generator velocity of rotation change, if De＞0, then the total damping coefficient is the summation of the damping value of the damping value of mechanical system and electrical system, obtains bigger damping force.That is to say, can confirm to calculate Δ P/ Δ ω by using from the Δ P of total power calculator 202 outputs, thereby become requirement ratio, exist at requirement ratio under the situation of deviation, can increase and decrease the distribution ratio of calculating by correction frequency divider 204 by using this departure, thereby make it consistent with the regulation ratio.

More than, the ratio of the correction of the power conversion device by increasing other replenishes the part of the correction deficiency of the bigger power conversion device of limits value, can adjust as gross power.Correction distribution ratio k1, the k2 of each power conversion device that calculates by correction distributor 204 be sent to each power converter control device 11a, 11b ..., in each power converter control device, adjust by correction adjuster 118 according to the distribution ratio that is sent.

So, even under the situation of the vibration suppression that load-side is arranged, also can be by in a plurality of power conversion devices, carrying out the distribution of correction, and adjust as gross power, carry out the vibration suppression of mains side.

In addition, connected the axle twisting vibration that the resonance frequency by motor and driven device in the power conversion device of the driven device that is driven by motor produces in load-side sometimes, can take place with specific speed.Therefore, from the mains side vibration suppression condition of mains side vibration suppression distributor 20 outputs, be not only the correction distribution ratio, can also be by appending the speed value of each power conversion device, and the speed value of the bigger power conversion device of limit amount operated relax limit amount, carry out the vibration suppression of mains side.

In addition, in the embodiment shown in fig. 4, though the input power calculated value to the gross power computing unit is from power conversion device, but also can in the gross power of the bearing power beyond comprising the power conversion device that is connected in identical systems, adjust, under this situation, have the effect of inhibition to the correction distribution ratio of each power conversion device.

If summarize the essence of each embodiment, then pay close attention to the variable power that the damping characteristic of the axle twisting vibration between turbine-driven generator is depended on load-side, be provided with following unit in mains side is connected in the power conversion device of the system with generator: variable quantity computing unit, its velocity of rotation with described generator change that frequency of input voltage as described power conversion device changes or amplitude variations detects; Power calculation unit, it calculates the power of described power conversion device; And power adjustment unit, it revises the action of described power conversion device so that the variation of described power calculation value according to described variable quantity.For example, in this is adjusted, the ratio that changes with variable power and generator velocity of rotation and the ratio identical (Δ P/ Δ ω=P0/ ω 0) at operating point place or make variable power and the ratio of generator velocity of rotation variation than the action of the ratio mode corrected output conversion equipment greatly at operating point place.In addition, be conceived to ratio of inertias that damping characteristic depends on turbine-driven generator, attenuation coefficient, intrinsic vibration number etc., can make to be used to carry out power that power adjusts and the relation between the variable quantity according to the mechanical condition of turbine-driven generator and variable.

In addition, be connected in system at mains side with generator, in load-side connects power conversion device by electric motor driven driven device, be provided with following unit: the variable quantity computing unit, frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as described power conversion device detect; Power calculation unit, it calculates the power of described power conversion device; Power adjustment unit, it revises the action of described power conversion device so that the variation of described power calculation value according to described variable quantity; The correction adjustment unit, it increases and decreases the correction of described power adjustment unit output; And revise and limit computing unit, its oscillation phenomenon according to load-side is calculated the limit amount of described correction adjustment unit, and this power conversion device increases and decreases correction output based on power adjustment unit by described correction adjustment unit according to the oscillation phenomenon of load-side.

In addition, be connected in system and in common system, connected the correction allocation units of the correction of the power conversion device that changes other in load-side connects system by the power conversion device of electric motor driven driven device under the situation that a plurality of corrections that are provided with at certain power conversion device are restricted at mains side, and adjust as gross power with generator.

In addition, be connected in system and in common system, connected a plurality of in the system of load-side connection at mains side by the power conversion device of electric motor driven driven device with generator, a plurality of power conversion devices are provided with respectively: the variable quantity computing unit, and frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as described power conversion device detect; Power calculation unit, it calculates the power of described power conversion device; Power adjustment unit, it revises the action of described power conversion device so that the variation of described power calculation value according to described variable quantity; The correction adjustment unit, it increases and decreases the correction of described power adjustment unit output; Revise the restriction computing unit, its oscillation phenomenon according to load-side is calculated the limit amount of described correction adjustment unit; And gross power computing unit, its summation to the performance number of the power calculation unit of each power conversion device is calculated, this system, adjusts as gross power so that the mode that described gross power calculated value changes changes the correction of any one power conversion device in the described power conversion device according to described variable quantity.

In above embodiment, though the example that drives driven device 9 (for example compressor of liquefied natural gas manufacturing usefulness) by motor 8 is illustrated, but be not limited thereto, also can be applied to boats and ships, under this situation, can constitute generator and electric motor drive system are loaded into boats and ships, drive by the screw of electric motor drive system to boats and ships.In addition, also can be applied to environmentally friendly vehicle (eco-car).Under this situation,, use internal combustion engine generator and electric motor drive system to come drive wheels with the internal combustion engine generator of generator as Electric.In addition, also can be used as and promptly use, under this situation, constitute UPS (uninterrupted power supply(ups)) as transducer with generator+UPS.Have again, also can be applied to electronic loading and unloading (dump) system, under this situation, can constitute generator and electric motor drive system are loaded into vehicle, and the driving wheel of vehicle is rotated by electric motor driven systems.But these examples are example application only, and not ccontaining doubting certainly is applied in other the system of generator+electric motor drive system.

Claims (27)

1. a power conversion device is connected in the system with generator, it is characterized in that having:

The command value calculating part, it calculates the command value as electric physical quantity;

Control part, its control transformation action makes it approach described command value; And

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator,

The command value that described command value calculating part is calculated as follows, this command value is carried out switching motion with the power of determining according to described velocity variable.

2. power conversion device according to claim 1 is characterized in that,

Described velocity variable calculating part detects the velocity of rotation variation of described generator as frequency of input voltage variation or amplitude variations.

3. power conversion device according to claim 1 is characterized in that,

The command value that described command value calculating part is calculated as follows, this command value become that to be equivalent to the electrical damping coefficient be power more than zero.

4. power conversion device according to claim 3 is characterized in that,

Described command value calculating part comprises the correction value calculating part, and this correction value calculating part calculates the correction value of revising described command value,

Described correction value calculating part becomes with described revised command value that to be equivalent to the electrical damping coefficient serve as that the mode of the power more than zero is calculated described correction value.

5. power conversion device according to claim 4 is characterized in that,

This power conversion device also has the power calculation portion of rated output,

Described correction value calculating part becomes with the described power that calculates that to make the electrical damping coefficient be the mode calcuating correction value of the power more than zero.

6. power conversion device according to claim 4 is characterized in that,

With the ratio of power variation and velocity variable is that the mode of requirement ratio is calculated described correction value.

7. power conversion device according to claim 1 is characterized in that,

The ratio of power variation and velocity variable depends on the ratio of power and the speed at operating point place.

8. power conversion device according to claim 7 is characterized in that,

Ratio with power variation and velocity variable is that power calculates described correction value with the mode more than 1 times of the ratio of the speed at operating point place.

9. power conversion device according to claim 1 is characterized in that,

According to the mechanical constant of mains side, make the relation between velocity variable and the power variation variable.

10. power conversion device according to claim 1 is characterized in that,

This power conversion device also has restrictions, and it limits described command value or carries out revised command value with correction value.

11. a power conversion device is connected in the system with generator, it is characterized in that having:

Control part, its control transformation action; And

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator,

Described power conversion device is according to described velocity variable power controlling in switching motion, so that the electrical damping coefficient is more than zero.

12. a power conversion device is connected in the system with generator, it is characterized in that having:

Control part, its control transformation action; And

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator,

The value that described power conversion device obtains after with the variable quantity of variable quantity divided by power with velocity of rotation is moved than the big mode control transformation of value that obtains after divided by power with velocity of rotation.

13. a power conversion device is connected in the system with generator, it is characterized in that having:

Control part, its control transformation action;

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator; And

Power calculation portion, its rated output,

Described power conversion device serves as that the mode of the power more than zero is carried out switching motion according to described detected velocity variable the described power that calculates is controlled at the electrical damping coefficient.

14. a power conversion device is connected in the system with generator, it is characterized in that having:

Control part, its control transformation action; And

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator,

Described power conversion device serves as that the mode of the power more than zero is carried out switching motion to be controlled to be the damping coefficient that forms in electrical system and mechanical system according to described variable quantity.

15. a power conversion device is connected in the system with generator, it is characterized in that having:

The command value calculating part, it calculates the command value as electric physical quantity;

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator;

The correction value calculating part, it calculates and has been used to the correction value that obtains following power and revise described command value according to described velocity variable, and this power is suppressed at the associated vibration of damping coefficient that forms in electrical system and the mechanical system; And

Control part, it controls electric physical quantity in the mode that approaches described revised command value.

16. a power conversion device is connected in the system with generator, and has connected by electric motor driven driven device in load-side, it is characterized in that having:

The command value calculating part, it calculates the command value as electric physical quantity;

Control part, it is to approach the mode control transformation action of described command value; And

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator,

Described command value calculating part calculates with according to described velocity variable and definite power carries out the command value of switching motion,

Described command value calculating part has:

The oscillation phenomenon test section, it detects the oscillation phenomenon of load-side; And

Restrictions, it limits described command value based on described detected oscillation phenomenon.

17. power conversion device according to claim 16 is characterized in that,

The detection of oscillation phenomenon is based on vibrating sensor or the output of described motor is detected.

18. a power conversion system is characterized in that,

The described power conversion device of claim 1 is carried as the part of boats and ships, electric car or motor vehicle, perhaps as uninterrupted power supply.

19. power conversion system, in having the system of generator, jointly be connected with a plurality of power conversion devices, described power conversion device is connected in system with generator and has connected by electric motor driven driven device in load-side, described power conversion system is characterised in that to have:

The command value calculating part, it calculates the command value of each power conversion device, and described command value is electric physical quantity;

Velocity variable calculating part, its detection are equivalent to the velocity variable of the velocity of rotation variation of described generator;

The correction calculating part, it is according to described detected velocity variable, described each power conversion device is calculated the correction value that described command value is revised respectively, so that obtain to be suppressed at the power of the associated vibration of the damping coefficient that forms in electrical system and the mechanical system; And

Control part, it is to approach the mode of described revised command value, the electric physical quantity of described each power conversion device of control.

20. power conversion system according to claim 19 is characterized in that,

The mode that becomes setting according to the power by each power conversion device summation is calculated described correction value.

21. power conversion system according to claim 20 is characterized in that,

This power conversion system also has restrictions, and it limits the correction value or the revised command value of any one power conversion device in described a plurality of power conversion device,

Described power conversion system changes the correction value or the revised command value of other command value of described a plurality of power conversion devices based on described restriction.

22. power conversion system, in common system, be connected with a plurality of power conversion devices, described power conversion device is connected in system with generator and has connected by electric motor driven driven device in load-side, and described power conversion system is characterised in that to have:

The command value calculating part, it calculates the command value as each power conversion device of electric physical quantity;

Variable quantity calculating part, its detection are equivalent to the variable quantity of the velocity of rotation variation of described generator;

The command value calculating part, it is according to described detected variable quantity, to each power conversion device computations value, so that the quantity of power of the associated vibration of the damping coefficient that forms in electrical system and mechanical system of being inhibited;

Restrictions, it limits described command value; With

Control part, it controls electric physical quantity in the mode that the electric physical quantity with described each power conversion device has approached to limit the value of described each command value.

23. power conversion system, in common system, be connected with a plurality of power conversion devices, described power conversion device is connected in system with generator and connects by electric motor driven driven device in load-side, and described power conversion system is characterised in that

In a plurality of power conversion devices, be provided with respectively:

The variable quantity calculating part, frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as described power conversion device detect;

Power calculation portion, it calculates the power of described power conversion device;

The power adjustment part, it revises the action of described power conversion device according to described variable quantity, so that described power calculation value changes;

The correction adjustment part, it increases and decreases the correction of described power adjustment part output; And

Revise the restriction calculating part, its oscillation phenomenon according to load-side is calculated the limit amount of described correction adjustment part,

Described power conversion system has:

The gross power calculating part, it calculates the summation of performance number of the power calculation portion of each power conversion device;

The variable quantity calculating part, frequency of input voltage variation or amplitude variations that its velocity of rotation with described generator changes as described power conversion device detect; And

The gross power adjustment part, it is according to described variable quantity, so that the mode that described gross power calculated value changes, changes the correction of any one power conversion device in the described power conversion device, to adjust as gross power.

24. power conversion system according to claim 23 is characterized in that,

Oscillation phenomenon based on the load-side of each power conversion device, according to the speed value of operating each power conversion device from the size of the limit amount of revising the restriction calculating part, described correction restriction calculating part comes the computed correction adjustment part according to the oscillation phenomenon of the load-side of each power conversion device limit amount.

25. power conversion system according to claim 23 is characterized in that,

Except the bearing power that is connected in identical systems, also adjust as gross power.

26. the control method of a power conversion device is characterized in that,

Calculating is as the command value of electric physical quantity;

Detection is equivalent to the velocity variable of the velocity of rotation variation of generator;

Calculating is with according to described velocity variable and definite power carries out the command value of switching motion;

To approach the mode of described command value, control the switching motion of the power conversion device that is connected with system with generator.

27. the control method of a power conversion device is characterized in that,

At each of a plurality of power conversion devices that are connected in system jointly:

Calculating is as the command value of electric physical quantity;

Detection is equivalent to the velocity variable of the velocity of rotation variation of described generator;

According to described detected velocity variable, described each power conversion device is calculated the correction value of revising described command value, so that the power of the associated vibration of the damping coefficient that in electrical system and mechanical system, forms of being inhibited;

To approach the mode of described revised command value, the switching motion of described each power conversion device of control.

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