CN101908855B - Power conversion apparatus, power conversion system and control method of power conversion apparatus - Google Patents

Abstract

The invention provides a power conversion apparatus, power conversion system and control method of power conversion apparatus, for driving motor in a mode of not generating shaft torsional oscillation between turbodynam. The power conversion apparatus is provided with a variation calculator 114, which takes the rotational speed variation of the generator as the frequency variation or amplitude variation of the input voltage of the power conversion apparatus to detect; a power calculator 115, which calculates the power of the power conversion apparatus; and a power regulator 116, which corrects the movement of the power conversion apparatus based on the variation to change the power calculation value. The power conversion apparatus inputs the variation come from the variation calculator 114 and the power calculation value come from the power calculator 115 to the power regulator 116, in the power regulator 116, the correcting signal for making the output current of the power converter variable is inputted to a motor torque moment controller 112 in a mode that the power calculation value varies based on the variation. Herein, the power regulator 116 outputs a correcting amount making the output current variable in a mode that the ratio of the power change and generator rotational speed variation is identical to the ratio at the movement point (delta(P)/delta(Omega)=P(0)/Omega(0)) or is larger than the ration.

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 that is suitable for suppressing power conversion device, power device system and the power conversion device of the axle twisting vibration that produces between turbine and generator.

Background technology

About the axle twisting vibration between turbine-driven generator, carrying out more research in DC power-supply system, for example shown in JP 2000-224896 communique, when turbine-driven generator is connected near the direct current dislocation of DC power-supply system, the condition that the power that carries out due to direct current dislocation is controlled, 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 the axle twisting vibration.

In addition, even beyond DC power-supply system, the control technology of following power conversion device is for example disclosed in Unexamined Patent 11-27993 communique, 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 be consisted of by combination of motor and generator etc., by detecting the resonance frequency component of Blast Furnace Top Gas Recovery Turbine Unit (TRT), and removed the oscillating component of circuit for eliminating Blast Furnace Top Gas Recovery Turbine Unit (TRT) by resonance frequency, suppress occur to disturb and make vibration continue/increase with the resonance frequency of the mechanical system of Blast Furnace Top Gas Recovery Turbine Unit (TRT).

[patent documentation 1] JP 2000-224896 communique

[patent documentation 2] Unexamined Patent 11-27993 communique

At this, from saving the viewpoint of energy, mostly adopt by power converter the generated output of turbine-driven generator is converted to the technology that variable frequency is used.For example, utilize motor and power conversion device to carry out the motorized of variable-ratio to the system that is directly driven 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 again to adjust 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 occur 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, it controls switching motion, makes it close to 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 ratio control in switching motion, so that the electrical damping coefficient is more than zero.

Perhaps constitute and have: control part, it controls switching motion; 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 compares the large mode of value that obtains after divided by power with velocity of rotation and controls switching motion.

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

Perhaps constitute and have: control part, it controls switching motion; 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 carries out switching motion to be controlled to be the damping coefficient that forms in electrical system and mechanical system according to described variable quantity as the mode of the power more than zero.

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 mechanical system; And control part, it is to control electric physical quantity close to the mode of 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 controls switching motion in the mode close to 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 restriction section, it is based on the described command value of described detected oscillation phenomenon restriction.

Perhaps a kind of power conversion system constitutes and has: 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 respectively the correction value that described command value is revised, in order to obtain to be suppressed at the power of the associated vibration of the damping coefficient that forms in electrical system and mechanical system; And control part, it controls the electric physical quantity of described each power conversion device in the mode close to described revised command value.

Perhaps a kind of power conversion system constitutes and has: 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; Restriction section, it limits described command value; And control part, it is to control electric physical quantity with the electric physical quantity of described each power conversion device close to the mode of the value that has limited described each command value.

Perhaps a kind of power conversion system constitutes in a plurality of power conversion devices and arranges respectively: the variable quantity calculating part, and frequency change or amplitude variations that its velocity of rotation with described generator changes as the input voltage of described power conversion device detect; Power calculation section, it calculates the power of described power conversion device; The power adjustment part, it revises the action of described power conversion device, so that described power calculation value changes according to described variable quantity; The correction adjustment part, the correction of its described power of increase and decrease adjustment part output; And revise the restriction calculating part, and it calculates the limit amount of described correction adjustment part according to the oscillation phenomenon of load-side, and described power conversion system has: the gross power calculating part, it calculates the summation of performance number of the power calculation section of each power conversion device; The variable quantity calculating part, frequency change or amplitude variations that its velocity of rotation with described generator changes as the input voltage of 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 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 to change as the variable adjustment of the mode of the uses such as mechanical energy ground in power conversion device, thereby the driving that can be used as motor etc. can be used.

Description of drawings

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

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

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

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

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

Fig. 6 means that Δ P/ Δ ω is on the performance plot of the degree of impact of total damping coefficient.

In figure:

The 1-combustion gas turbine

The 2-generator

Mechanical axis between 3-combustion gas turbine and generator

The transformer of 4-from generator voltage to system voltage

The transformer of 5-from 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 setting apparatus

118-correction adjuster

119-revises limit calculator

Embodiment

Below, utilize accompanying drawing that the best approach that is used for carrying 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 with generator 2 by mechanical axis 3 combinations.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 the power transfer from described transformer 5 outputs, the 8th, the motor that the power of being exported by described power converter drives, the 9th, by the driven device that described motor drives, motor 8 and driven device 9 are by mechanical axis 10 combinations.

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, although each inscape of power converter control device 12 is described as～device, but also can consist of 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 that represents.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 input 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 of power converter control device described.At first, in power converter control device 11, be input 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 output torque or the speed of motor 8 in the amount controller 112 at motor is calculated and the voltage instruction value of power output transducer 7.Particularly, be input to speed control 152 from the speed value of speed command generator 111 output and deviation between the speed estimating value of exporting from speed estimating calculator 151, calculate and the output current command value in speed control 152, 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 the 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 in speed estimating calculator 151, come the presumed value of the velocity of rotation of calculating motor 8.In addition, also operating speed presumed value not sometimes, and by the velocity of rotation of speed detector direct-detection motor 8.Next, the current instruction value that is calculated by speed control 152 and input to current controller 153 from the deviation between the current detection value of current detector 12 outputs, calculate and the output voltage command value in current controller 153, so that current detection value is consistent with current instruction value.Then, described voltage instruction value is input 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 between the expression turbine-driven generator by 2 quality (mass), and K is 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 that the total by J1 and J2 represents, 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 due to the load that is connected in generator (comprising control device).According to the state equation of 2 vibrational systems that obtain from Fig. 5, the characteristic equation of system is (1) formula.

(formula 1)

$S^3+(\frac{\mathrm{Dm}(\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">J</figure-callout>}1+J2)}{\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">J</figure-callout>}1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2}+\frac{\mathrm{De}}{J2})S^2$

$+(\frac{K(\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">J</figure-callout>}1+J2)}{\mathrm{<figure-callout\; id="1"\; label="J"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">J</figure-callout>}1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2}+\frac{\mathrm{Dm}\&CenterDot;\mathrm{De}}{J1\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2\&CenterDot;})S+\frac{K\&CenterDot;\mathrm{De}}{J1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">J</figure-callout>}2}=0$ ... formula 1

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

(formula 2)

$2\mathrm{\&zeta;\&omega;n}=(\mathrm{Dm}+\frac{\mathrm{<figure-callout\; id="1"\; label="De"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">De</figure-callout>}}{1+n})\&CenterDot;\frac{{(1+n)}^2}{n\&CenterDot;J}$ ... 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 attenuation coefficient, and ω n is the intrinsic vibration number, and n is 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)

$\mathrm{Ds}=\mathrm{Dm}+\frac{\mathrm{<figure-callout\; id="1"\; label="De"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">De</figure-callout>}}{1+n}$ ... 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, if consider near output type P0=ω 0 τ 0 operating point that changing unit obtains (6) formula.Be (7) formula if try to achieve electrical system damping coefficient De (=Δ τ/Δ ω) according to (6) 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 is negative damping, according to the damping value of mechanical system, the total damping coefficient is the negative wild effect that produces.Power changes the ratio at the ratio that changes with respect to the generator velocity of rotation and operating point place when identical (Δ P/ Δ ω=P0/ ω 0), if De=0, the total damping coefficient is only the damping value of mechanical system, and oscillation phenomenon is decayed by the damping coefficient of mechanical system.In addition, change the ratio that changes with respect to the generator velocity of rotation than the ratio at operating point place greatly the time at power, if De＞0, the total damping coefficient is the summation of the damping coefficient of the damping value of mechanical system and electrical system, can obtain larger damping force.

Be conceived to above relation, next the control action in the present invention described.For utilizing (7) formula to make electrical system damping De for just, make power change to such an extent that get final product greatly than the ratio at operating point place based on the variation of generator velocity of rotation.Show as frequency change or the amplitude variations of the input voltage of power conversion device due to the changing unit of generator velocity of rotation, therefore detect voltage by voltage detector 14, and its detected value is inputed to variable quantity calculator 114.Variable quantity calculator 114 calculates the variable quantities line output of going forward side by side.in addition, the output current of the power converter that is detected by current detector 12 is input to power calculator 115 with the output voltage of the power converter 7 that is detected by voltage detector 13, 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 power changing unit 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 power calculator 115 from the variable quantity of variable quantity calculator 114, 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 input to motor to amount controller 112 be used to the variable corrected signal Δ I of the output current that makes power converter, with the current instruction value addition from speed control 152 outputs.At this, the correcting current value in power regulator 116 is for example calculated as follows.Power P because obtain P=VIcos θ according to voltage V, electric current I, power-factor cos θ, if therefore near the power variation Δ P operating point is similar to try to achieve, 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 as Δ P/ Δ ω=α P0/ ω 0 with the Δ P/ Δ ω of regulation, according to (8) formula, be used for changing the correcting current value Δ I of Δ P as shown in (9) formula with the ratio of regulation.

(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 is only the characteristic of mechanical damping system that the vibration characteristics of turbogenerator can become.Have again, by factor alpha being set larger 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 larger 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 the Δ P from power calculator 115 outputs, and become the ratio of regulation by calculating Δ P/ Δ ω, in the situation that have deviation for the ratio of 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, although changed energetically correcting current value Δ I, in addition, by reducing ride gain (response) or changing voltage instruction by the combination of counting circuit, also can realize.

[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 power calculation value of using when according to mechanical condition, corrected signal to power regulator 116 outputs being calculated and the relation (Δ P/ Δ ω) of variable quantity (the velocity of rotation variable quantity of generator) are variable.In addition, only the part different from embodiment 1 described, description thereof is omitted for identical part.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, as shown in (11) formula.

(formula 10)

$\mathrm{Dm}=2\mathrm{\&zeta;}0\mathrm{\&omega;<figure-callout\; id="0"\; label="n"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">n</figure-callout>}0\&CenterDot;\frac{n\&CenterDot;J}{{(1+n)}^2}$ ... formula 10

(formula 11)

$\mathrm{Ds}/\mathrm{Dm}=1+\frac{1/\mathrm{\&omega;}(\mathrm{\&Delta;P}/\mathrm{\&Delta;\&omega;}-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">P</figure-callout>}0/\mathrm{\&omega;}0)}{2\mathrm{\&zeta;}0\mathrm{\&omega;<figure-callout\; id="0"\; label="n"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">n</figure-callout>}0\&CenterDot;n/(1+n)\&CenterDot;J}$ ... formula 11

Represent in Fig. 6: according to (11) formula, Δ P/ Δ ω is made as parameter, for example ω n0 is counted in attenuation coefficient ζ 0 and intrinsic vibration and be fixed as certain numerical value, calculate the variation of the Ds/Dm when having inputted Δ P/ Δ ω and P0/ ω 0, transverse axis represents ratio of inertias n.Fig. 6 represents when ratio of inertias hour, larger variation occurs because Δ P/ Δ ω can make vibration characteristics.Equally, as shown in (11) formula, ω n0 is counted in attenuation coefficient ζ 0, intrinsic vibration, total damping is less, larger variation occurs because Δ P/ Δ ω can make vibration characteristics.On the other hand, due to power conversion device be the desirable power that requires take the output loading side as purpose, the power adjustment unit that therefore is used for suppressing the axle twisting vibration of generating pusher side becomes external disturbance, preferably its correction is as far as possible little.Therefore, can be by the turbine-driven generator condition setting apparatus 117 that the mechanical condition of turbine-driven generator is set, make 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, based on the condition set information from turbine-driven generator condition setting apparatus 117, try to achieve the relation that total damping coefficient Ds is at least the Δ P/ Δ ω more than zero, 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 impact of the control performance of load-side by the mechanical condition of mains side, be carried out the vibration control of mains side by as far as possible little correction.

[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, sometimes the additional 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, the frequency of the correction that produces when the power adjustment unit by the axle twisting vibration that be used for to suppress the generating pusher side is during close to the resonance frequency between motor and driven device, due to phase relation based on the corrected signal of the shaft vibration inhibit feature of load-side, lose inhibition 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 the 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 the limit amount of described correction adjuster is set, by 118 pairs of correction outputs based on power regulator 116 of correction adjuster, increase and decrease in for negative scope at total damping coefficient at least.

That is to say, indirectly be provided with the vibrating sensor that the vibration to load-side detects, when the vibration values that correction limit calculator 119 is exported at vibrating sensor (size, phase place or polarity) is larger 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 based on the output signal of revising limit calculator 119, revises output in the mode of the current value that is no more than regulation.

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, although in Fig. 3, the velocity variations of axle twisting vibration as motor 8 detected, but sometimes also the axle twisting vibration of the load-side variable quantity as the current detection value of current detector 12 outputs is detected, output suppresses the voltage instruction value of this vibration, and carries out the load-side vibration suppression.In 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.Although distinguished 5 to 13 by suffix a, b in Fig. 4, have identical function.In the situation that be connected with a plurality of power conversion devices in identical systems, can be carried out by the summation of a plurality of power adjustment units the vibration suppression of mains side.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 the 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 the 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 devices of output.Next, the control action of mains side vibration suppression condition distributor 20 described.There is restriction in the situation that change the correcting current value of the power of each power conversion device in the power conversion device of a part to being used for variation according to the generator velocity of rotation, the ratio of the correcting current value by increasing other power conversion devices replenishes its impact, 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 the power conversion device of 2 in the situation that a side has applied restriction, calculate as follows.To be made as γ from the correction limit amount of each power conversion device 11a, 11b, be 1 in 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, the correcting current value with as the electric current I 0 of operating point such as (12) formula is depicted as identical value (each power conversion device is the situation of common α set point).Therefore, be conceived to be controlled by the summation of the Δ I that calculates with same ratio the variable quantity of gross power, keep as follows the gross power variable quantity by adjusting frequency dividing ratio.By making the summation under 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, unrestricted lower when adjusting with k1 at γ 2 restricted (k2=γ 2) γ 1, 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)

$\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HSA00000133614500061.png"\; state="\{\{state\}\}">k</figure-callout>}1=1+\frac{I01\&CenterDot;\mathrm{\&Delta;I}2}{\mathrm{\&Delta;I}1\&CenterDot;I02}\&CenterDot;(1-k2)=2-\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HSA00000133614500011.png,HSA00000133614500041.png"\; state="\{\{state\}\}">K</figure-callout>}2$ ... formula 14

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

Next, the control action of gross power adjuster 203 described.For made electrical system damping De for just, as long as change power according to the variation of generator velocity of rotation by (7) formula.Show as frequency change or the amplitude variations of the input voltage of power conversion device due to the changing unit of generator velocity of rotation, therefore detect voltage by voltage detector 14, its detected value is inputed to variable quantity calculator 201.Variable quantity calculator 201 calculates and the exporting change amount.In addition, from each power converter control device 11a, 11b ... power calculation value P and power variation Δ P be input 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, in the situation that the power of gross power calculated value changes the ratio identical (Δ P/ Δ ω=P0/ ω 0) with the ratio of generator velocity of rotation variation and operating point place, if De=0, the total damping coefficient is only the damping value of mechanical system, and oscillation phenomenon is decayed by the damping coefficient of mechanical system.In addition, power changes in the ratio situation greatly of ratio than operating point place that changes with the generator velocity of rotation, if De＞0, the total damping coefficient is the summation of the damping value of the damping value of mechanical system and electrical system, obtains larger 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, in the situation that have deviation for requirement ratio, can be by increasing and decreasing the distribution ratio of being calculated by correction frequency divider 204 with this departure, thus make it consistent with the regulation ratio.

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

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

In addition, sometimes connected in load-side 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, can occur 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 larger power conversion device of limit amount is operated to relax limit amount, carry out the vibration suppression of mains side.

In addition, in the embodiment shown in fig. 4, although the input power calculated value to the gross power computing unit is from power conversion device, but also can adjust in the gross power that comprises the power conversion device bearing power in addition that is connected in identical systems, in this situation, has the effect that suppresses the correction distribution ratio of each power conversion device.

If summarize the essence of each embodiment, pay close attention to the power variation that the damping characteristic of the axle twisting vibration between turbine-driven generator is depended on load-side, in being connected in the power conversion device of the system with generator, mains side is provided with following unit: the variable quantity computing unit, and frequency change or amplitude variations that its velocity of rotation with described generator changes as the input voltage of described power conversion device detect; 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, change the ratio identical (Δ P/ Δ ω=P0/ ω 0) at the ratio that changes with the generator velocity of rotation and operating point place with power or make the power variation 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 be used to carrying out power that power adjusts and the relation between variable quantity according to the mechanical condition of turbine-driven generator variable.

In addition, be connected in system with generator at mains side, in load-side connects power conversion device by electric motor driven driven device, be provided with following unit: the variable quantity computing unit, frequency change or amplitude variations that its velocity of rotation with described generator changes as the input voltage of 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, the correction of the described power adjustment unit output of its increase and decrease; And revise and limit computing unit, it calculates the limit amount of described correction adjustment unit according to the oscillation phenomenon of load-side, 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 the system with generator and connected in common system at mains side and a plurality ofly be provided with in the situation that the correction of certain power conversion device is restricted 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, and adjust as gross power.

In addition, be connected in the system with generator and connected a plurality of in load-side connects system by the power conversion device of electric motor driven driven device in common system at mains side, a plurality of power conversion devices arrange respectively: the variable quantity computing unit, and frequency change or amplitude variations that its velocity of rotation with described generator changes as the input voltage of 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, the correction of the described power adjustment unit output of its increase and decrease; Revise the restriction computing unit, it calculates the limit amount of described correction adjustment unit according to the oscillation phenomenon of load-side; 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 described power conversion device according to described variable quantity.

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

Claims (27)

1. a power conversion device, be 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, it controls switching motion, makes it close to 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 value that the command value that described command value calculating part is calculated as follows, this command value obtain after with the variable quantity of variable quantity divided by velocity of rotation with power is carried out switching motion than the large mode of value that power is obtained after divided by velocity of rotation.

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

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

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 take described revised command value and is equivalent to the electrical damping coefficient and calculates described correction value as the mode of the power more than zero.

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

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

Described correction value calculating part becomes take the described power that calculates makes the electrical damping coefficient as the mode calcuating correction value of the power more than zero.

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

Calculate described correction value take the ratio of power variation and velocity variable as the mode of requirement ratio.

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 6, is characterized in that,

Calculate described correction value take the ratio of power variation and velocity variable as power 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 power variation variable.

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

This power conversion device also has restriction section, its described command value of restriction or carry 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, it controls switching motion; 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 velocity of rotation with power is than the large mode power ratio control in switching motion of value that power is obtained after divided by velocity of rotation, 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, it controls switching motion; 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 velocity of rotation with power is controlled switching motion than the large mode of value that power is obtained after divided by velocity of rotation.

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

Control part, it controls switching motion;

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

Power calculation section, its rated output,

The value that described power conversion device obtains after the variable quantity of variable quantity divided by velocity of rotation with power will the described power that calculates than the large mode of the value that power is obtained after divided by velocity of rotation be controlled at the electrical damping coefficient and carries out switching motion as the power more than zero.

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

Control part, it controls switching motion; 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 the variable quantity of variable quantity divided by velocity of rotation with power is controlled to be the damping coefficient that forms and carries out switching motion as the power more than zero in electrical system and mechanical system than the large mode of value that power is obtained after divided by velocity of rotation.

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, its value that obtains after with the variable quantity of variable quantity divided by velocity of rotation with power is than the large mode of value that power is obtained after divided by velocity of rotation, calculating has been used to the correction value that obtains following power and revise described command value, and this power is suppressed at the associated vibration of damping coefficient that forms in electrical system and mechanical system; And

Control part, it is to control electric physical quantity close to the mode of 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 controls switching motion in the mode close to 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 and to carry out the command value of switching motion with the value that obtains after the variable quantity of variable quantity divided by velocity of rotation with power than the large mode of value that power is obtained after divided by velocity of rotation,

Described command value calculating part has:

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

Restriction section, it is based on the described command value of described detected oscillation phenomenon restriction.

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,

Power conversion device claimed in claim 1 is carried as the part of boats and ships or motor vehicle, perhaps as uninterrupted power supply.

19. power conversion system, jointly be connected with a plurality of power conversion devices in having the system of generator, described power conversion device is connected in the 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, its value that obtains after with the variable quantity of variable quantity divided by velocity of rotation with power is than the large mode of value that power is obtained after divided by velocity of rotation, described each power conversion device is calculated respectively the correction value that described command value is revised, in order to obtain to be suppressed at the power of the associated vibration of the damping coefficient that forms in electrical system and mechanical system; And

Control part, it controls the electric physical quantity of described each power conversion device in the mode close to described revised command value.

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 restriction section, correction value or the revised command value of any one power conversion device in the described a plurality of power conversion devices of its restriction,

Described power conversion system changes 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, be connected with a plurality of power conversion devices in common system, described power conversion device is connected in the 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, its value that obtains after with the variable quantity of variable quantity divided by velocity of rotation with power is than the large mode of value that power is obtained after divided by velocity of rotation, 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;

Restriction section, it limits described command value; With

Control part, it is to control electric physical quantity with the electric physical quantity of described each power conversion device close to the mode of the value that has limited described each command value.

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

Arrange respectively in a plurality of power conversion devices:

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

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

The power adjustment part, the action of the described power conversion device of mode correction that its value that obtains after with the variable quantity of variable quantity divided by velocity of rotation with power is larger than the value that power is obtained after divided by velocity of rotation is so that described power calculation value changes;

The correction adjustment part, the correction of its described power of increase and decrease adjustment part output; And

Revise the restriction calculating part, it calculates the limit amount of described correction adjustment part according to the oscillation phenomenon of load-side,

Described power conversion system has:

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

The variable quantity calculating part, frequency change or amplitude variations that its velocity of rotation with described generator changes as the input voltage of 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 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, operate the speed value of each power conversion device according to the size from the limit amount of revising the restriction calculating part, described correction restriction calculating part comes the limit amount of computed correction adjustment part according to the oscillation phenomenon of the load-side of each power conversion device.

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

Adjust as the gross power that comprises the bearing power that is connected in identical systems.

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;

The value that calculating obtains after with the variable quantity of variable quantity divided by velocity of rotation with power is carried out the command value of switching motion than the large mode of value that power is obtained after divided by velocity of rotation;

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

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

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

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;

With the value that obtains after the variable quantity of variable quantity divided by velocity of rotation with power than the large mode of value that power is obtained after divided by velocity of rotation, 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 forms of being inhibited in electrical system and mechanical system;

In the mode close to described revised command value, control the switching motion of described each power conversion device.

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