CN1060253C - Rotary machine controller and control method thereof - Google Patents

Abstract

To realize optimum operation corresponding to a load state by an inverter itself by providing the inside of the inverter with a control means for controlling in such a way that the detected internal state quantity of the inverter coincides with the stored target value. A shunt resistance SH detects a load state. A console CONS sets a load characteristic or sets the accelerating-decelerating time of an inverter, a V/F characteristic (a relational ratio between inverter output voltage and frequency), and the like. An MCU reads voltage across the shunt SH inputted from signal terminals CNO, CNG. An operation command signal reads a signal PN 5 the signal level of which becomes low from high by the on state of a photo-coupler FTC when terminals FW and COM are short-circuited. The frequency of the inverter INV is further commanded to firing-circuit from the MCU through a signal SG1, and a current control circuit G is further driven through a signal SG2 to control the output voltage of the inverter INV.

Description

Rotary machine controller and controlling method thereof

The present invention relates to a kind of inverter and controller and controlling method that is used for rotary driving machinery.

For example in turbine pump and the turboblower, its water output or air demand are directly proportional with motion speed at rotating machinery, supply water or square being directly proportional of the pressure of compressed air stream and motion speed, and export then and cube being directly proportional of motion speed.This means that motion speed reduces with the reduction of load capacity, thereby an advantage that produces is to reduce energy.

Therefore, when utilizing an inverter to drive the rotating machinery of turbine pump for example etc. so that controlling its speed, can be at an easy rate according to load variations control water output and pressure of supply water or air demand and blast.Therefore, should further consider to utilize inverter to carry out speed controlling.

Consult Fig. 1 to Fig. 4, introduce an inverter example that is applied in the water system.Fig. 1 is the schematic representation of expression water system.This water system comprises water pipe 1 and 6, pump 3, motor 4, pressurized container 7, gate valve 2-1 and 2-2, quick safety check 5, pressure transducer 8, pressure instrument 9 and a controller as shown in Figure 3.Fig. 2 represents the characteristic working curve figure of water system shown in Figure 1, and ordinate is represented pressure H, and horizontal ordinate is represented water yield Q.Curve A represents that working as speed pump operation is N _AThe time Q-H characteristic curve that obtains, curve B and C represent respectively when motion speed be N _BAnd N _CThe time Q-H characteristic curve that obtains.Actual speed pump operation is a continually varying, but for simplicity, and curve A, B, C represent is roadability under the segmentation speed.In addition, H ₀Represent a required pressure minimum (total head), under this pressure, work as generation maximum amount of water Q _AThe time, utilize a sleeve pipe that water can be utilized sufficiently at highest water level.

In Fig. 2, when the employed water yield of pump from Q _AThrough Q _BChange at 0 o'clock, pump operates in an a (motion speed N respectively _A), b (motion speed N _B) and c (motion speed N _C), and the discharge pressure of pump maintains steady state value H in this example simultaneously ₀Fig. 3 is the schematic representation of the control circuit of expression water supply installation, wherein PW represents power supply, ELB is the leadage circuit circuit breaker, and INV is an inverter, comprises the setup unit of respectively controlling constant (as acceleration and deceleration time, V/F characteristic or the like) and the control gear of display unit and CONS is one.IM represents motor shown in Figure 14, and SS is a switch starter, and STX is a relay, and CU is a control unit, and it comprises microprocessor CPU, storage M, input/output end port PIO-1, PIO-2 and PIO-3; One stabilized power supply AVR, digital-to-analog converter (D/A transducer) D/A, analog/digital converter (A/D transducer) A/D and a constant setting section SW.In Fig. 1 to Fig. 3, when gate valve 2-2 closed, leadage circuit circuit breaker ELB connected, switch S S closure, and power supply is provided to main feeder ear R, S and the T of inverter INV, and the contact closure of relay STX is so that hold short circuit with FW end and the COM of inverter INV.And then, to control unit CU power supply, finish the preparation of operation from stabilized power supply AVR whereby.When in this state, when the valve 2-2 that opens the sluices made terminal use's water, pressure of supply water descended, and pressure transducer 8 detects this reduction.The pressure signal that is detected by pressure transducer 8 is provided to a register of microprocessor CPU through the A/D transducer by input/output end port PIO-2 and is stored among the storage M.When these data were lower than the initial pressure of before being set and being stored in by the constant setting section among the storage M, CPU provided for example running speed signal N Fig. 2 shown in by rate signal input end O from input/output end port PIO-1 to inverter INV and L through the D/A transducer _CTherefore, inverter provides and motion speed N to electric motor I M _CCorresponding frequency and voltage.Therefore, water pump 3 works in motion speed N _CAfter this, when water consumption variation and pressure of supply water variation, as mentioned above, pressure transducer 8 detects these variations.CPU compares the value and the previous target discharge pressure of setting and being stored in the storage that are detected in constant setting section SW, and quicken and the deceleration instruction signal to inverter output, so that the value that is detected equals target discharge pressure, whereby pressure of supply water is maintained to steady state value H ₀And supply water.

Fig. 4 represents to be used to drive the inverter INV of conventional rotating machinery of turbine pump shown in Figure 3 and turboblower and the schematic representation of control circuit thereof in more detailed mode.R, S and T represent the input end of AC power supplies; U, V and W represent to receive the connecting end of load motor 4; CNV is the rectifier that is made of the circuit module that an ac power supply AC who is used for AC power supplies is transformed to DC electrical source DC; RS is a resistance that is used for suppressing inrush current when connecting power supply; CB is a smmothing capacitor; SH is a shunt resistance that is used to detect load condition; INV1 is an inverter that is made of transistor modular, is used to respond an instruction that comes automatic triggering circuit and current control circuit G, will be the voltage with required frequency by the DC transformation of electrical energy of rectifier conversion; MCU is one and is used to monitor and the microcomputer of control inverter device, is made up of (for example) single chip microcomputer; AVR is a stabilized power supply that is used to provide stable, adjustable DC power supply; FTC is a photo coupler; R1 and R2 are resistance; D1 and D2 are diodes; C1 is a capacitor; CONS1 is one and is used to set load characteristic, acceleration and the deceleration time of inverter etc. and the control gear of V/F characteristic (output voltage of inverter and the ratio between the frequency); CONS2 is a display unit; FW is the connecting end that is connected the operating instruction signal with COM.This conventional rotary machine inverter comprises speed input signal connecting end O and L, utilizes the A/D transducer to be transformed to digital speed command signal from the analog rate command signal of connecting end O input, is provided to microcomputer.

In the patent publication of Japan Patent office application JP-A-59-54797, JP-A-57-113992, JP-A-59-65591 and other are arranged as prior art.

Described in above-mentioned prior art, its purpose of inverter that is used in the rotating machinery of turbine pump and so on is pilot pressure, blast or the like and energy-conservation, therefore need the controller of a costliness, this controller need adopt a microcomputer at its periphery.Particularly need to be provided for making required instruction under the speed of this rotating machinery operation to inverter from the outside through input connecting end O and L.Therefore, as described in the prior art, need be according to the neighbouring part control rate of load condition at inverter.

In addition, provide pressure transducer or flowmeter as the device that detects load condition, and sensor is expensive, the operation that is used for installment work has increased cost of production.

Recently, press for the rotating machinery of miniaturization and package unit cheaply.Therefore, the objective of the invention is:

1),, realizes the optimal operating condition that inverter itself and load condition are complementary by saving the speed command signal input end O and the L of inverter even complicated peripheral circuit is not provided;

2) remove peripheral control circuit, and utilize a kind of simple circuit configuration, obtain compact structure, light weight and cheap cost;

3) only by outside operating instruction control gear is connected with COM with the starting order signal end FW of inverter, just can realize fully automatic operation;

4) detect load condition and utilize inverter itself to determine to move according to what kind of characteristic curve operation.

The invention provides a kind of rotary machine controller that comprises an inverter, it is used to utilize the speed of inverter control rotating machinery, it is characterized in that, provide storage device, be used to make the state of a control parameter of state parameter response rotating machinery of the inside of inverter, internal state parameter in the inverter is stored as a desired value; Also provide detection device, be used for detecting inverter internal state parameter; And provide control gear, and it is contained in and is used for control in the inverter, makes that the detected internal state parameter of inverter is consistent with the desired value of being stored, and optimal way is as follows:

1) necessary for speed command signal from the inverter outside is no longer become, in advance with the algorithm stores of speed command in being contained in inner storage arrangement, and provide speed command according to this algorithm.In the algorithm of speed command, pre-determining the speed of inverter with the corresponding mode of load condition (the internal state parameter of inverter), and provide one be used for according to this relation set load condition and inverter speed the operating console device, be used to the device that is used to detect load condition storing the storage device of setting data and be configured in inverter.The correlation of the correlation that is stored in load condition in the storage arrangement and inverter speed and the actual loading state that is detected by detection device and the actual velocity that slowly changes is consistent.

2) signal of expression load starting is provided to inverter by the signal parameter such as pressure and flow rate from the outside.Inverter work when providing this signal; If this signal is not provided, inverter then is stopped.

3) represent with a curve that from left to right increases such as the load characteristic of rotating machineries such as turbine pump and turboblower with load, even and revolution change and also to keep constant.Therefore, obtain the correlation of the shunt voltage change (corresponding to the variation of the internal current of inverter) of running load characteristic curve and inverter in advance, and this correlation and inverter velocity correlation.Therefore algorithm will be formulated according to this correlation.

Runnability

In inverter, be provided with storage arrangement, the state parameter of its storage inverter inside and the correlation of speed, but not the correlation of the state parameter of inverter outside and speed, and formulate speed command at the state parameter of inverter internal condition inverter inside.Therefore, do not need to provide speed command from the inverter outside.

In addition, in optimal way, the operating console device is set the motion speed of inverter work in advance according to load condition.Data that memory means stores within inverter sets and programmed sequence of operations.The load condition of inverter detects by the ohmically voltage change of shunt.

In addition, input end FW and COM are the input ends of invertor operation command signal.Import this signal and put into operation according to top imposing a condition.

When rotating machinery is driven, be input to input end FW and COM such as the sensor signal of pressure and flow rate.Therefore, rotating machinery moves according to the load condition of rotating machinery and the speed of before having determined according to load condition.The present invention can realize following technique effect.

(1) owing to removed the external speed instruction input end and the circuit thereof of inverter, no longer needs complicated peripheral control circuit, can realize low cost, miniaturization and light structure, and improved reliability by simplifying circuit.

(2) according to the correlation of the various characteristics of water pump and inverter, pre-determine load curve, and utilize control gear directly in inverter, to set the running load state and stored.Actual load condition utilizes the shunt voltage of inverter to detect.The shunting voltage that detects is controlled so that and the load condition of setting (load curve) consistent, and can correspondingly realize the optimum operation of turbomachinery.

(3) by above-mentioned (1) and (2), utilize simple operating instruction device just can realize fully automatic operation.When turbine pump was used as the Aided Machine of cooling water, its method of operation became the operation with main frame interlock, and did not have very simply the installing of measuring ability by receiving the operating instruction signal from main frame, just can constituting.Therefore,

1) even, also can utilize the optimum operation that inverter itself is realized and load condition is complementary as the speed command signal input end O that removes inverter and L and no longer during the complicated peripheral circuit of installing.

2) utilize not just energy implementation structure compactness, weight saving and the cost reduction of simple circuit structure of the peripheral control circuit of tool.

3) only by outside operating instruction control gear being connected to the starting order signal end FW and the COM of inverter, just can realize full-automatic operation.

4) utilize inverter itself just can detect load condition, and utilize inverter itself just can determine the roadability curve.

By below in conjunction with the accompanying drawing detailed description of the present invention, above-mentioned purpose, feature and advantage with other of the present invention will become more obvious.

Fig. 1 is the schematic representation of expression water supply installation;

Fig. 2 is the roadability curve of water supply installation;

Fig. 3 is the control circuit figure of conventional water supply installation;

Fig. 4 is the schematic representation of the conventional general inverter of expression;

Fig. 5 is the schematic representation of the inverter of expression rotating machinery of the present invention;

Fig. 6 is the circuit diagram that rotating machinery inverter of the present invention is installed to water supply installation;

Fig. 7 is the performance diagram under the situation of utilizing rotating machinery inverter driving water pump of the present invention;

Fig. 8 is the performance diagram of the load curve when representing that algorithm makes water pump operation according to an embodiment of the invention;

Fig. 9 is the algorithm of expression embodiments of the invention and the flow chart of programmed sequence of operations;

Figure 10 is the algorithm of expression embodiments of the invention and the flow chart of programmed sequence of operations; And

Figure 11 is the algorithm of expression embodiments of the invention and the flow chart of programmed sequence of operations.

Introduce one embodiment of the present of invention with reference to Fig. 5 to 11.Fig. 5 schematically represents according to an embodiment of the invention, is used to drive the inverter of turbine pump or turboblower and so on rotating machinery.R, S and T represent the input end of AC power supplies; U, V and W are the connecting end that is connected to load motor 4; CNV is that being used for the AC transformation of electrical energy by one is the rectifier unit that the circuit module of DC electric energy constitutes; RS is the resistance that suppresses inrush current when being used to connect power supply; CB is a smoothing capacity; SH is the shunt resistance that is used to detect load condition; The inverter that INV is made up of transistor modular is used for will changing the voltage with the required frequency of load motor into by the DC electric energy of rectifier conversion in response to trigger circuit of hereinafter introducing and the instruction of current control circuit G; MCU is one and is used to monitor and the microcomputer of control inverter device, can be made of (for example) single chip microcomputer; AVR is the stabilized power supply of the controlled DC power supply that is used to provide stable; FTC is a photo coupler; R1 and R2 are resistance; D1 and D2 are diodes; C1 is a capacitor; CONS is the load characteristic, acceleration and the deceleration time that are used to set inverter and the control gear of V/F characteristic (output voltage of inverter and the ratio between the frequency); LCD is a display unit; And FW and COM end is the operating instruction signal end.

MCU reads from signal end CNO and CNG voltages input, shunt resistance SH two ends.In addition, as the operating instruction signal, when short circuit between connecting end FW and COM, by connecting photo coupler FTC, read signal PNS, the signal level of this signal changes to low (L) from high (H).And then MCU is by sending signal SG1 as the command control inverter frequency to trigger circuit, and by signal SG2 driving current control circuit G, so that the output voltage of control inverter.In addition, the detection device that is used to detect load condition also can adopt Hall element but not the current probe CT of shunt resistance SH constitutes by one.

Fig. 6 represents the example of inverter INV of the present invention (Fig. 5), this inverter is installed to the water supply installation that comprises turbine pump and is made of very simple circuit, wherein the relay PS and ON/OFF (on/off) signal of operating instruction device incoming pressure detection device between the FW of inverter and COM end.

Fig. 7 is the representational typical characteristics plotted curve of the pump-unit of the embodiment of the invention, and wherein load condition is represented by the voltage at the shunt resistance SH two ends of inverter.In Fig. 7, represent identical implication with those identical reference symbols shown in Figure 2, therefore omit introduction to it.In Fig. 7, Q1 represents to be applicable to the maximum water consumption of water system, and HT represents lift desired when stream has maximum amount of water in water system, and it comprises that actual lift Ha, necessary terminal pressure Hp and pipe loss Hf (put a).Numeral 11 expressions resulting pipe loss curve (load curve) when being provided to water in the water system, load condition is represented by pressure H and water yield Q in water system.When water consumption is Q3 (water yield is 0), pipe loss is 0, defines coordinate points c.Desired whole lift is that (pipe loss is H to H1 under water consumption Q2 ₁-(Hp-Ha)), coordinate points b defined.Obtain load curve 11 by connecting base punctuate c, b and a.In addition, make and select pump working, satisfy maximum water consumption Q under motion speed N1 (normal top speed) at Q-H characteristic curve A ₁With whole lift HT.

When water consumption (load) from Q1 through Q2 when being changed to Q3, water pump operation is in that (Q1, H0) (Q2, H-1) (Q3 is on the load curve 11 H2) to a some c through a b from an a.

The ohmically voltage of shunt of the load condition of expression inverter also changes with the variation of load condition naturally.The variable quantity that load curve 12 expression among Fig. 7 and load curve 11 are relevant.Voltage SV on the shunt resistance SH is expressed as the ordinate of load curve 12, and curve D is represented to change from Q1 to Q2 to Q3 resulting Q-SV curve when the motion speed of water pump is fixed on N1 simultaneously when water consumption.Similarly, curve E and F represent respectively to change similarly when water consumption, and the Q-SV curve that the motion speed of pump obtains when changing to N2 and N3.

A curve by connecting base punctuate d, e and f make just obtains load curve 12.

Or rather, at the coordinate a on the load curve 11 corresponding to the coordinate d on the load curve 12.Similarly, coordinate points b is corresponding to coordinate points e, and coordinate points c is corresponding to coordinate points f.In other words, if when water consumption be the motion speed of Q1 and inverter when being N1, the voltage on the shunt resistance SH is SV1, this means that water system satisfies required pressure HT.Similarly, if when water consumption is Q2, the voltage SV2 of shunt is operated in following time of invertor operation speed N2, water system satisfies desired pressure H1, and if water consumption be Q3, inverter speed is N3, when the voltage of shunt is SV3, satisfy pressure of supply water H2.By utilizing the operating console device CONS in advance will be in the storage of for example inverter microcomputer MCU as the load curve of SV and N coefficient or one form stores, and motion speed N by control inverter, the voltage SV of the feasible shunt that is detected is consistent with the voltage of the shunt of storage, just can realize this point.

Because these characteristics are the peculiar performances of pump, according to each pump is different, so the voltage SV on the shunt resistance SH of inverter and the correlation of the motion speed in this moment are to determine according to certain correlation (resistance curve of pipe line 11) in advance, this correlation is meant required pressure with respect to the relation between the water consumption in every water pump, and how water pump moves according to load curve 12 is determined.

Table 1 is expressed an example of above-mentioned arrangement result.(table 1)

Pattern		Q1		Q2		Q3
								N1	SV1	N2	SV2	N3	SV3
		A	H0	NA1	SVA1
H1									NA2	SVA2
			H3										NA3	SVA3
B	H0							NB1	SVB1
		H1			NB2	SVB2
	H3											NB3		SVB3
		C	H0	NC1	SVC1
H1									NC2	SVC2
			H3										NC3	SVC3

In this embodiment, utilize data shown in the aforesaid operating console device CONS his-and-hers watches 1 as shown in Figure 5 to set in advance according to Mode A, B and C.In this example, consider the data on these 3, can certainly suitably consider five data on the point, data are not limited to this 3 point.Situation with Mode A is an example, and when flow rate is Q1, pressure when being H0, NA1 is stored as speed N1, and SVA1 is stored as the ohmically voltage SV1 of shunt.In addition, when flow be Q2, when pressure is H2, NA2 is stored as speed N2, SVA2 is stored as the ohmically voltage SV2 of shunt.When flow rate is Q3 and pressure when being H3, NA3 is stored as speed N3, and SV3 is stored as the ohmically voltage SV2 of shunt.

Fig. 8 is the performance diagram of the amplification of plotted curve shown in Figure 7, as the representational pattern of introducing control algorithm.For convenience's sake, suppose that operating in water consumption before this type order is that Q1, required pressure are that HO1, motion speed are on the point of N1, be positioned at coordinate points g (Q1, HO1).At this moment, supposing to make operating conditions is that the motion speed of inverter is N1, and shunt resistance both end voltage is SV1, be located in naturally coordinate points 1 on the load curve 12 (N1, SV1).Be reduced under the situation of Q5 the algorithm of research under this state from Q1 in water consumption.

(1) initial value (from Fig. 8)

N1 and SV1, N2 and SV2 and N3 and SV3 are stored in the mode that corresponds to each other, make that the desired value at N1 place shunt voltage is SV1, desired value at N2 place shunt voltage is SV2, is SV3 (will corresponding to the form stores of table 1) in the desired value of N3 place shunt voltage.

On the other hand, as the function of load curve 12, following equation is stored in the storage of microcomputer.

SV=f(N)……(1)

(2) water yield changes to Q5 from Q1.

Because motion speed is N1, the coordinate points g on pump characteristic A moves to coordinate points h, and along with this moves, the voltage at shunt resistance two ends will (N1 SV1) moves to coordinate m (N1, SV1 ') from the coordinate points on the curve D 1.

In this, detect the shunt voltage SV1 ' of inverter.

(3) SV1 ' with desired value SV1 and detection compares.Thereupon, because SV1＞SV1 ' deducts △ A (minimum resolution of speed controlling, for example 1 bit) from current speed.And then, can understand at an easy rate, when SV1=SV1 ＇, keep current speed; And when SV1＞SV1 ', current speed increases △ A.In this state, motion speed becomes N4 (N1 → △ A → N4), the characteristic curve of water pump becomes A ', makes coordinate points move to i from h.And then.Curve N and shunt voltage become D ＇, and coordinate points moves to n (N4, SV4 ') from m (N1, SV1 ＇).According to the target shunt voltage at N4 place, obtain SV=f (N4) ≡ SV4.With comprehensive method, detect the voltage SV4 ' of shunt resistance.

(4) SV4 ' with desired value SV4 and detection compares.Thereupon, because SV4＞SV4 ' further deducts △ A from current speed.Therefore, motion speed becomes N5 (the j point on N4 → △ A → N5), pump characteristic becomes A ", make coordinate points move on to curve A ".The N-SV curve becomes D ", coordinate points moves to n (N4, SV4 ') and arrives Q (N5, SV5 ') again.

According to the target shunt voltage at N4 place, obtain SV=f (N5) ≡ SV5 from equation (1).With comprehensive method, detect the voltage SV5 ' of shunt.

(5) once more the SV5 ' of desired value SV5 and detection is compared.Thereupon, SV5＞SV5 '.Omit detailed introduction, as mentioned above, when motion speed reduced △ A, the operation point converged to coordinate points k on the resistance curve of pipe line 11 and the coordinate points p on the load curve 12.As a result, motion speed becomes N6, and target shunt voltage becomes SV6 (=f (N6)), and it is consistent with the shunt voltage that detects.Therefore, SV6 '=SV6 is that motion speed is stabilized in N6 under the state of Q5 in water consumption.

Fig. 9,10 and 11 is flow charts of implementing above-mentioned algorithm.The program of formulating according to this flow chart is stored in the microcomputer in the inverter in advance.In Fig. 9, carry out the initialization of this algorithm in step 100.Then, carry out the interrupt latency step in step 101.

When detecting this interruption, carry out step as shown in figure 10.For example utilize the timer interrupt mode to implement this interrupt step.In step 201, confirm the pattern of operating console device CONS.In step 202 to 204, differentiate display mode.According to discrimination result, show shunt voltage SV, electric current I or frequency F in step 205,206 or 207.If the differentiation result in step 202 is not a display mode, process proceeds to step 208, in this step, judges whether this pattern is that constant is set pattern.If constant is set pattern, process proceeds to step 209, in this step, set the correlation that comprises motion speed and shunt voltage according to table 1, the for example data of N1=SV1, N3=SV3, and computing function formula SV=f (N) (equation (1)) is so that be stored in the storage.For other required data of invertor operation, as minimum speed, top speed, V/F characteristic, inverter time for acceleration, deceleration time or the like are all set.When this sets the step end, set SET=OFFH.When this setting was finished, process was recovered out from the interrupt step in step 210, turns back to step 101.

Then, process proceeds to step 102, whether differentiates SET=OFFH in this step.If not OFFH, step 101 circulation is set up to finishing constant.In the process of carrying out circulation step, carry out the interrupt procedure of INT1.In other words, when producing outside operating instruction signal (for example starting state) and pressure-detecting device P as shown in Figure 6 and close, the termination FW of inverter and COM be short circuit each other, and photo coupler FTC is switched on, and PN5 is changed to 0.

As shown in the flow chart of Figure 11, check execution result according to the bit of the PN5 in step 213, process proceeds to step 215, carries out START=OFFH in this step, and it represents executable running state.Otherwise, carry out START=OOH in step 215, in step 216, process spins off from this circulation.

Then, whether differentiate START=OFFH in step 103.If OOH carries out the circulation from step 101 to 103, up to reaching OFFH.When reaching OFFH, think and set up starting conditions that process proceeds to step 104.In step 104, with initial velocity for example N=N5 bring into operation, at this moment, target shunt voltage SV is set to SV1 (SV=SV1), it is stored in the storage.In step 105, detect shunt voltage (this result is set to SV ').And then, desired value SV is compared with the SV ' of detection in step 106.According to comparative result, carry out following conditional jump.

If SV＞V ' transfers to step 107,

If SV=SV ' transfers to step 111, and

If SV＜SV ' transfers to step 109.

In step 107,, carry out subtraction (N-△ N → N), promptly from current speed, deduct △ N (minimum resolution) as explaining in the above-mentioned algorithm.In step 108, become the shunt voltage of next desired value by this equation (equation (1)) calculating, and be updated to a new value.That is, SV=f (N-△ N) is updated to a new shunt voltage SV, and this process proceeds to step 111.In step 109, opposite with process in step 107, speed increases △ N, and in step 110, upgrades desired value according to SV=f (N+ △ N) by the motion speed that has increased.In step 111, carry out the stand-by period process of a scheduled time △ t, this scheduled time △ t is the required scheduled time of system stability.Then, in step 112, whether differentiate START=OOH.If OOH carry out stopped process in step 113, and this process advances to step 102; If not OOH, process advances to step 105 and carries out follow-up process.In this manner, as utilize above-mentioned algorithm introduces, can realize convergence to predetermined value.

In the above-described embodiments, introduced turbine pump by way of example, and the present invention is not limited to this, clearly, replace the external status parameter of inverter by the internal state parameter that utilizes inverter, even also can control to turboblower or other rotating machinery.

According to the present invention, the storage device that is used to store each state parameter correlation of the correlation of each internal state parameter of inverter rather than inverter outside is installed in inverter inside, and forms velocity information and speed command control signal according to each state parameter of inverter inside in inverter.Therefore, the external speed command signal that no longer needs inverter.

Claims (12)

1. a rotary machine controller comprises an inverter, and this controller is used to utilize the speed of described inverter control rotating machinery, it is characterized in that comprising:

Storage device is used to make the state of a control parameter of the internal state parameter of described inverter corresponding to described rotating machinery, and storage is as the described internal state parameter of inverter desired value, described inside;

Detection device is used to detect the described internal state parameter of described inverter inside; And

Control gear is installed in and is used for control in the described inverter, so that make the internal state parameter of described detection of described inverter consistent with the desired value of described storage.

2. rotary machine controller as claimed in claim 1 is characterized in that, the algorithm that is used for speed command is stored in described inverter in advance, and described control gear is according to the speed of being controlled described rotating machinery by the speed command of described algorithmization.

3. rotary machine controller as claimed in claim 1 is characterized in that, by utilizing the outside operating instruction signal as operating conditions described inverter is started working.

4. rotary machine controller as claimed in claim 2 is characterized in that, described algorithm is to formulate according to the correlation of the load variations of described rotating machinery and motion speed.

5. rotary machine controller as claimed in claim 2, it is characterized in that, described detection device comprises a shunt that is used to detect the inverter of described inverter internal current, and the correlation of the voltage change of described memory device stores running load characteristic curve and described inverter shunt, described algorithm are to determine according to the voltage of described inverter shunt.

6. rotary machine controller as claimed in claim 5 is characterized in that, described algorithm is to utilize the voltage correlation of motion speed and described inverter shunt to determine.

7. rotary machine controller as claimed in claim 6 is characterized in that, also comprises the external setting-up device, is used to set the correlation of the voltage of described motion speed and described inverter shunt.

8. rotary machine controller as claimed in claim 1 is characterized in that described control gear comprises the closed-loop speed control gear, is used for determining rate control instruction according to the load variations characteristic curve and the motion speed that are stored in described inverter.

9. rotary machine controller as claimed in claim 1 is characterized in that described control gear comprises the closed-loop speed control gear, and it is controlled according to the motion speed of described rotating machinery and the electric current in the described inverter.

10. rotary machine controller as claimed in claim 2, it is characterized in that, be used to be stored in the load curve that the memory device stores of the correlation between the internal state parameter of parameter to be controlled and described inverter obtains by a certain load curve that replaces, the described load curve that is replaced is by described rotating machinery discharging flow rate and utilizes the motion speed that operates in the described inverter of operation on this load curve and the correlation of the voltage of the shunt resistance of described inverter, according to the load curve that pressure limited of the expectation of this flow rate.

11. rotary machine controller as claimed in claim 3 is characterized in that, the operating instruction device of turbomachinery is connected to the input end of the operating instruction signal of described inverter.

12. the controlling method of a rotary machine controller is characterized in that the steps include:

The load curve that the correlation of the inverter shunt voltage SV of the motion speed N of memory by using rotating machinery and inverter obtains;

When operating in any state and load curve, obtain the shunt voltage SV of the inverter of next desired value according to this moment motion speed N;

The shunt voltage-target of described inverter is compared with the shunt voltage SV ' of the inverter of detection, and carries out following steps according to the minimum resolution of the motion speed that is set at △ N:

If SV＞SV ' is set at N-△ N with N,

If SV=SV ' keeps the numerical value of N, and

If SV＜SV ' is set at N+ △ N with N;

The shunt voltage that upgrades next desired value according to the motion speed and the load curve of inverter.

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