WO1997028370A1

WO1997028370A1 - Turbomachinery driving apparatus and method of controlling the same

Info

Publication number: WO1997028370A1
Application number: PCT/JP1996/000760
Authority: WO
Inventors: Kouiti Satou; Takayuki Oshiga; Hiroshi Fujii; Jun Ohta; Hiroshi Onoh
Original assignee: Hitachi, Ltd.; Hitachi Techno Engineering Co., Ltd.; Hitachi Keiyo Engineering Co., Ltd.
Priority date: 1996-01-31
Filing date: 1996-03-22
Publication date: 1997-08-07
Also published as: KR100290496B1; KR19990082198A; CN1215452A; JP3758191B2; JP5286238B2; JP2010065703A; CN1168899C

Abstract

A turbomachinery driving apparatus using a dual inverter system and a method of controlling the same, wherein a main control unit for controlling the two inverters is omitted, and an external communication unit for transmitting signals representative of the mutual operational conditions of the inverters is made unnecessary, the exchanging of these signals being done simply, whereby the size, weight, manufacturing cost and the number of parts of the apparatus are reduced. First and second earth leakage breakers (ELB1, ELB2), inverters (INV1, INV2), pumps (4-1, 4-2) and motors (5-1, 5-2) constitute a full duplex feed water system. The inverters (INV1, INV2) are connected to each other by signal lines (S3) and adapted to exchange signals representative of their respective operational conditions and failure conditions and requirements for the operations of the partner systems. Out of the load condition detecting sensors, respective flow rate signal transmitting signal lines (S4, S5) are connected to the inverters directly, and pressure signal transmitting signal lines (S6, S7) in common.

Description

Specification

Turbomachine drive device and control method therefor

The present invention relates to a plurality of inverters for driving a plurality of turbomachines and an application device thereof. Background art

For turbo machines such as turbo pumps and turbo blowers, the water supply and air flow are proportional to the operating speed, the water supply pressure and wind pressure are proportional to the square of the operating speed, and their outputs are proportional to the cube of the operating speed. . This indicates that the operating speed can be reduced with a reduction in the load, and this has the advantage that energy can be saved.

Conventionally, a plurality of inverters have been used to control the speed so that the discharge pressures of the plurality of turbomachines are maintained in a certain relationship, and also to control the operation sequence and the number of the plurality of turbomachines. It is carried out.

Therefore, if the above-mentioned turbo machines are driven by a plurality of inverters to control the speed and the number of operating units, the water supply, air flow, water supply pressure and wind pressure can be controlled relatively easily and efficiently according to the load fluctuation. . For this reason, speed control using inverters is expected to become more and more popular in the future.

Of these, examples of using an inverter for the water supply device will be described with reference to FIGS. 1 to 3. Fig. 1 is a block diagram of the water supply system, where 1 is a water distribution pipe, 2-1, 2 and 2 are distribution pipe branches, 3-1, 3-2, 3-3 and 3-4 are gate valves, 4-1, 4-1 is a pump, 5-1, 5-2 is a motor, 6-1, 6-2 is a check valve, 7 is a water supply pipe, 8 is a pressure tank with an air reservoir inside, Reference numerals 9 and 10 denote pressure sensors for detecting the pressures on the pump suction side and the pump discharge side, respectively, and emit electric signals corresponding to the pressures of the detecting portions. FS 1 and FS 2 are flow switches, which are turned on when the amount of water is less than QS shown in FIGS. 2 and 3 described later. The CNU is a control device. The power circuits and relay circuits R and RV consist of inverters INV 1 and INV 2 that drive the motors 5-1 and 5-2 at variable speeds, and earth leakage breakers ELB 1 and ELB 2 that protect against electric leakage. It consists of a controller CU. The relay circuit R includes a transformer TR, a stabilized power supply Z, relays 52 X 1 and 52 X 2, and an interface I ZO between the relay TR and the controller CU.

The controller CU is an arithmetic processing unit CPU (hereinafter abbreviated as CPU), an AZD converter for converting signals (analog amount) from the pressure sensors 9 and 10 into digital signals, and an inverter INV. 1, a DZA converter for commanding the speed command signals Nl, N2 desired by the water supply system to INV2, a power supply terminal E for supplying power to the controller CU, and a relay 52x1, described above. Equipped with an output port PIO-1 to transmit signal S4 to interface IZ〇 for driving 5 2 X2. Similarly, the input port PI 〇-2 for reading the set value set by the setting means C to operate according to the operating characteristics of the pump shown in Figs. 2 and 3, When the contacts ELBAL1, ELBAL2, and the inverters INVl, INV2 trip due to overload, etc. Operating contacts INVAL 1, INV Λ Input port PIO-3 for reading the status of L2. In other words, in accordance with these fault conditions, the CPU stops the pump, switches to the other pump that is at rest, and issues a command to operate the pump, and executes the control thereof.

FIG. 2 is an operation characteristic diagram when one pump is operated alone or two pumps are alternately operated by the above-described water supply device. Figure 2 shows the water volume Q. Curve A shows the curves B, C, and D as well as the Q-.H performance curve _c when the pump is driven by the inverter at the operating speed N3, that is, 100% operating speed. Are the QH performance curves when the pump is driven at N2, N1, and NO operating speeds, respectively. Curve F is a pipeline resistance curve.For example, when the amount of water used changes from the amount of water Q 1 to the amount of water Q 0, if water is supplied at a pressure along the curve F on the discharge side of the pump, the end faucet is The water supply system shows that the desired pressure is obtained. The above-mentioned inverters I NV 1 and INV 2 determine the conditions under which the motor rotates under acceleration / deceleration time, V / F (output voltage and output frequency characteristics, etc.). Set externally by 2. That is, the water supply device operates the pump on the curve F along O 3 − → O 2 → O 1 —O 0.

In Fig. 1, when the earth leakage and the breakers ELB1 and ELB2 are turned on and the control power circuit breaker CB is turned on, the power supply of the control unit CU is established, and the CPU is stored in the memory M in advance. Initial setting is performed based on the program, setting information is read from setting means C, and the inverter, earth leakage, and breaker status (no failure) are read from input port PIO-3, and furthermore. Read the signals of the pressure sensors 9 and 10 via the AZD converter. In addition, a pipeline resistance curve F is stored in advance, and the feedwater pressure is changed along the resistance curve F in response to a change in the operating speed when the load condition changes. . Thus, the operation preparation is completed. If water is used in this state, the water supply pressure will drop, and if it falls below the starting pressure HON shown in Fig. 2, the CPU will output the interface 1 through the output port P Ο Ο-1. (5) Outputs a signal for energizing 5 2 X 1 and outputs a signal of operation speed Ν 1 to inverter INV 1 via a DZA converter. As a result, the inverter IΝV 1 starts, and the motor 5-1 is driven. After the operation, the feedwater pressure is controlled based on the signal of the pressure sensor 10 so as to be on the curve F. When the amount of water used decreases and the pump stop condition is established, the CPU cancels the currently output energizing signal of the relay 52 x 1 and the speed command signal N 1 to the inverter INV.1. This stops pump 4-1. When water is used again and the water supply pressure becomes HON or less and the starting condition is established, a signal of relay 52 2 、 2 and operation speed Ν2 is issued, and the other inverter INV 2 and motor 5 — 2, is driven, and pumps 4-2 are operated. Thereafter, similarly, the switching control is performed and the alternate operation is performed.

FIG. 3 is a characteristic diagram when two pumps are operated in parallel, and those indicated by the same reference numerals as those in FIG. 2 have the same meaning. That is, as shown in FIG. 2, two pumps are operated alternately, and when the amount of water used further increases, the pumps 411 and 412 are simultaneously operated. When the amount of water used exceeds Q3, the operation speed Ν3 is the maximum speed, so the water supply capacity is insufficient, and the water supply pressure drops to HL. This causes the CPU to emit both the relay 52 x 1 and 52 x 2 signals and the speeds N 1 and N 2. In this way, the inverters INV 1 and INV 2 and the motors 5-1 and 5-2 operate simultaneously, and the pumps 41 and 4-2 operate in parallel. After operation, control based on the signal of the pressure sensor 10 is performed so that the feedwater pressure is on the curve F.

In FIG. 3, when the amount of water used decreases, the operation speed becomes N 4 + N 3, and when the water supply pressure reaches H H, one of the two units stops and the unit operates alone.

For example, Japanese Patent Publication No. Hei 5—2 3 1 3 3 2 can be referred to as a well-known example. As described above, the conventional main control for controlling two inverters by controlling the inverters on the upper ranks Equipment needed.

The above-described conventional technology has the following problems. That is, (1) In the conventional system, there is a problem that even if the two inverters are normal, if the main control device stops operating due to an abnormality, the system goes down and water is cut off. (2) When the system is configured with dual inverters, each has its own control function, so even if one unit goes down due to a failure, the other unit can perform the backup operation. However, it is difficult to convey each other's control status because they have individual control functions. For alternate and parallel operation of inverters. It is necessary to detect and to issue an operation command. In addition, there are many interlock signals, and the control port has a complicated system. Disclosure of the invention

The present invention has been made in view of the above points, and has as its object the purpose of eliminating the need for external peripheral devices, facilitating signal exchange, realizing small size, light weight, and low cost. The goal is to obtain a dual inverter and its application equipment.

In order to achieve the above object, the present invention provides two turbo machines, two inverters each for driving the turbo machine, and a plurality of sensors for detecting a load state of the turbo machine. In the turbomachine driving device for controlling the speed of the turbomachine, the inverters are connected to each other by four kinds of connection signals indicating an operation state, and the signals of the plurality of sensors are connected to the two inverters. A turbomachine driving device for controlling the speed of the turbomachine while taking in common and interlocking the two inverters with each other based on the interlocking signal. Turbomachines, two inverters for driving the turbomachines one by one, and detecting a load state of the turbomachines and outputting a detection signal common to the inverters. In a system having a plurality of sensors for controlling the turbomachine, when the sensor detects a predetermined starting state, an inverter set in advance as a priority machine is started, and the priority machine is started. Is the parallel operation start condition When the priority is detected, the inverter driving the priority unit issues a start request to the inactive inverter to start the inactive inverter. Until the next unit to be driven becomes the parallel constant speed state, the gearbox was operated with the inverter so that the discharge pressure was controlled at the discharge-side maximum target pressure during single-unit operation, and the priority units were started in parallel. When the next generator is operated in the parallel constant speed state, the speed is shifted so that the estimated terminal pressure is controlled to be constant at the estimated pressure on the discharge side during the parallel operation of the two units, and the underload state determined by the sensor is determined in advance. This is a method for controlling a turbomachine driving device, wherein the priority machine is stopped when detected. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram of a conventional turbomachine driving device.

FIG. 2 is an operation characteristic diagram when the pump is operated independently or alternately. FIG. 3 is an operation characteristic diagram when two pumps are operated in parallel.

FIG. 4 is an overall configuration diagram of a system illustrating a water supply device as a turbomachine according to the present invention.

FIG. 5 shows the details of the terminals of the dual inverter according to the present invention and the explanation of the connection signals.

FIG. 6 is a time chart showing the procedure of power-on processing of the apparatus shown in FIG. 4 according to the present invention.

FIG. 7 is a time chart showing a method of controlling the parallel operation of the apparatus shown in FIG. 4 according to the present invention.

FIG. 8 is a flowchart for realizing the processing of FIGS. 6 and 7 according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION The outline of the embodiment of the present invention is as follows.

The signal contents necessary for the signal exchange of the dedicated inverter are minimized as much as possible. I which a conventional general-purpose inverter has

Use the ZO port as it is. By detecting the pump operation, stop, and parallel operation start and release detection only with the preceding inverter, the complicated interaction signals between the inverters are simplified, and the mutual Are connected by the smallest signal, preferably two outputs and two input signals, to send and receive signals to and from each other. In addition, these inverters are set in advance by the setting unit to set the driving force of the inverter or the operation pattern of the load, and to set the priority machine to which of the inverters is operated first. . In this way, alternate and parallel operation, retry in case of abnormality, and backup operation are performed. The earth leakage breaker protects the short circuit of the main circuit and the earth leakage of the secondary side, and cuts off the main circuit. The inverter drives the turbomachine and is composed of a double system. The signals from the pressure sensor for detecting the load condition, the means for detecting the underload condition, and the pressure sensor on the suction side are taken in parallel and directly at the same level. Each inverter incorporates a software program for operating the microcomputer, describing the control method and procedure in advance, and operates according to input signals from sensors and the like. At the beginning of use, when a short circuit or a breaker is turned on, the power for both inverters is established, and the one that is externally set as the priority unit in advance waits for operation. If the pressure sensor that detects the load condition detects the preset starting pressure, the inverter that is on standby will start. The sensor that detects the underload condition detects this, and when the preset stop condition is established, the inverter stops, and the inactive inverter can be operated by the stop signal of the preceding machine. Start and stop as described above. Further, if the pressure sensor for detecting the load state detects a preset parallel operation pressure state, the operating inverter is in contact with the inactive inverter. And outputs a parallel operation request signal, and the inverter that is at rest operates in parallel from the operable state. In addition, in the event of a short circuit, trip of the breaker, or trip of the inverter, this condition is transmitted to each other by the signal line connecting the two inverters. Operation, and the abnormal side generates an internal signal and retries. In addition, this condition is indicated by an error code on the panel display of the inverter, and a signal is issued externally. In addition, the display unit displays pressure, current, voltage, and frequency values. Hereinafter, an embodiment of the present invention will be described in more detail with reference to the drawings.

FIG. 4 is an overall configuration diagram showing an embodiment in which the present invention is applied to a water supply device. The components denoted by the same reference numerals as those in FIG. 1 cited in the description of the prior art are the same as those in FIG. .

In the figure, the control device CNU is provided with a ground fault and a breaker ELB1, ELB2, inverters NV1, NV2, and noise filters ZCL0, ZCL1, ZCL2. This is because the relay circuit R and the control unit (both hardware and software) CU shown in Fig. 1 are incorporated in the inverters INV1 and INV2 described above.

That is, the inverters INV 1 and INV 2 output the electric leakage and the trip signal AL of the breakers ELB 1 and ELB 2 to the external terminal of the control panel via the signal lines S 1 and S 2. Output as a signal.

Input the signal FS lb or FS 2 b of the flow switch FS 1 or FS 2 to the terminal D 14-C OM via the signal line S 4 or S 5, and send the signals of the pressure sensors 9 and 10. Input to terminals AN0, AN1, L via signal lines S6, S7, respectively. Since the pressure sensors 9 and 10 are commonly used for the inverters INV1 and INV2, they are connected by a signal line S8. Inverter INV 1 and INV 2 terminals DI 1, DI 2, DO l, and DO 2 are connected by signal line S 3, and signals such as operation status, failure status, and operation request Exchanges. The DI 3 terminal is used as the priority device selection signal, and the inverter INV 1 is short-circuited to the CAM. .

Further, the signal lines S9 and S10 are signals for outputting a fault of the inverters I NV1 and I NV2 to a central monitoring panel or the like.

Figure 5 and Table 1 show the details of the interlocking signal S3 for the inverters INV1 and INV2. Table 1 is a symbol table showing the output state and the control state of the interlocking signal of the dual inverter according to the present invention.

The interface signals of inverter 1 and inverter 2 each have two outputs and two inputs. By turning on and off these 2-bit signals, four types of states can be set. You can let the other person know.

In FIG. 5, assuming that the states of outputs DO 1 and D 02 are expressed in the states A to D shown in Table 1, state A is a state in which D 01 and DO 2 are both ON and oneself. If the pump is running ahead, the "parallel start request" signal is shown.

(table 1 )

If it is the next pump, it indicates the "parallel constant speed state" signal that is output when the preset maximum speed constant state is reached. This is because both Occurs when parallel operation is set in mode. State B indicates "Auto-alternating (parallel)" with D〇l on and DO2 off. State C indicates "auto-alternating (parallel) with DO1 off and DO2 on. Indicates the status of “Standby.” Status D indicates “powered stand-alone mode”, “manual mode”, “failure stop”, and “power off” when both DO1 and DO2 are OFF. The status of "medium" indicates that the vehicle is operating alone, or the vehicle cannot be operated alternately / parallel. The above signals enable alternate, parallel, backup operation in case of failure, etc. Can be realized.

Details of the signal exchange will be described with reference to the time charts of FIGS. First, using the time chart in Fig. 6, the alternate operation after power-on and the operation in the event of an abnormality will be described. At time 1 in the figure, the power of inverter 1 rises, and the state changes from D to C. At this time, the other inverter 2 remains in the D state since the power has not been turned on yet. Only inverter 1 can operate the pump, so inverter 1 automatically operates in stand-alone operation. At time 2, inverter 1 detects the pump start condition and inverter 1 operates. At this time, inverter 1 outputs B state from C state, indicating that it is operating. At time 3, a pump stop condition is detected, and inverter 1 stops and outputs B state to C state. Next, at time 4, since the power supply of the inverter 2 is turned on, the inverter 2 outputs the C state from the D state. Inverter 1 shifts from independent operation to alternate and parallel operation because inverter 2 is in the C-down state and alternate or parallel operation is possible. At time 5, the pump start condition is detected. At this time, the start condition is satisfied at the same time because both Invert 1 and Inverter 2 are receiving the same sensor signal, but since Inverter 1 is set as the priority device, Inverter 1 starts first and state C Outputs B from Inverter 2 is already connected to C when power is turned on. Although it is in the alternate mode because it is in the state, the non-priority machine has a delay in operation even if the start condition is detected. Inverter 2 stops running because inverter 1 operates first and outputs state B. By delaying the timing in this way, simultaneous activation is prevented. After time 5, the preceding aircraft and the next engine arrived, so stop at time 6, start condition is satisfied at time 7, and inverter 2 operates. Thereafter, the alternate operation is performed in the same manner. If a fault occurs in inverter 1 at time 10, the state of inverter 1 changes from B to D. At this time, the stopped inverter 2 judges that the inverter 1 has failed because the state of the inverter 1 has changed from B to D, and starts the operation because the start condition has been detected, and changes the state from C to B. Output to If the fault of inverter 1 is recovered at time 11 while inverter 2 is in operation, inverter 1 outputs the status from D to C, and the normal alternating operation mode becomes possible. Become. At time 1 and 2, inverter 2 stops, and normal alternate operation is performed after S terai ij 13. Next, the parallel operation will be described using the time chart in FIG. At time 1 in the same figure, in the same state as time 4 in FIG. 6, if a start condition is detected at time 2 in the same figure, as in time 5 in FIG. Inverter 1 which is set to starts operation first. If the parallel start condition is satisfied in Hidaka 3, the inverter 1 outputs a “parallel start request” A to the inverter 2 if the inverter 2 is in the state C in which the inverter 2 can automatically operate. Inverter 2 starts operation after confirming that inverter 1 has output status A. At this time, the inverter 2 outputs B from the state C and gradually increases the speed to the set speed (preferably the MAX speed). Inverter 1 keeps the discharge pressure constant by setting O 3 (point of the maximum target pressure on the first discharge side) of the F curve in FIG. Perform gear shifting operation as required. At time 4, inverter 2 reaches the set speed. Outputs "Parallel constant speed state" from B to A. After confirming the condition A of the inverter 2 in the inverter 1, the speed change operation based on the constant control of the estimated end pressure according to the change of the water amount at the target value on the O3 to O5 of the F curve in FIG. I do. When inverter 1 detects the parallel release condition at time 5, pump 4-1 is stopped and the status is output from A to C. Inverter 2 confirms that inverter 1 is in the C state, and changes the estimated end pressure from the constant speed operation to the target value on the 0 to 03 of the F curve in Fig. 3 according to the change in water flow. The shift operation is performed based on the constant control. In this way, by the above signal exchange, starting, parallel introduction, parallel release, and stop conditions can be detected only by the preceding machine, and control can be centralized. Further, by this method, the pressure fluctuation in the parallel start can be suppressed to be small, and the operation machine can be switched by the parallel.

Next, a flow for realizing control as in the time charts of FIGS. 6 and 7 will be described using the flow chart of FIG. "〇" in the figure indicates a symbol for outputting the own state. "□" indicates with a symbol how the opponent's state has changed. At 800, the priority device is determined in advance by the external terminal of the inverter. At 801, when the power is turned on, at 802, the priority unit is forcibly set as the preceding unit and the non-priority unit is set as the next unit. At 803, the state becomes a standby state until the start condition is satisfied, and when the start condition is satisfied, the processing shifts to 804, where the processing is performed by setting the preceding or next engine. Split.

In the case of the preceding machine, start the engine at 805, check if it is faulty at 806, and if it is normal, at 807, go to the top of the F-curve in Fig. The terminal pressure constant control according to the change in water flow is performed with the target value of, while the underwater flow condition is confirmed in 808, and if the condition is satisfied, stop processing is started in 809. If it stops, the next Switch the setting to the generator to prepare for alternate operation. If the underwater condition was not detected at 8 08 and the parallel condition was confirmed at 81 °, the partner status was confirmed at 8 11

If it is "automatic standby", "parallel activation request" is output to the other party in 8 12 and parallel activation is performed. Check the other party's state in 8 13 and until the other party is in the “parallel constant speed state” in 8 14 to 8 16. Is controlled at a constant discharge pressure with the target point of the maximum target pressure of After confirming that the other party's state is "parallel constant speed state", in step 818, set the terminal pressure of the second unit to the target value on 03 to 05 of the F curve in Fig. 3 according to the change in water volume. Control with. At 820, the parallel release condition is checked, and if the condition is satisfied, at 821, the preceding machine is stopped. In the meantime, if the next engine breaks down between 817 and 820, return to 807 and control with the terminal pressure of only one unit kept constant. At 8 19, the failure status of the preceding machine (self) is checked. If the preceding machine stops due to a failure or due to parallel release, the setting is switched from the preceding machine to the next kneading machine at 822 in the same way as the stoppage of detection of underflow, and the next alternate operation is prepared. The above is the processing as a preceding machine for realizing the time charts in FIGS. 6 and 7.

Next, with regard to the processing of the next engine, in 804, it is confirmed whether or not the opponent's preceding apparatus has been driven or has been driven in 823 when it has been set as the next engine. If it is running, check if there is a parallel request in 8 24, and if so, start it in parallel in 8 26. After the start, in 8 229, it operates at a constant speed until the preceding aircraft stops. When it starts up, it accelerates. At 8 2 8, it notifies the preceding machine of “parallel constant speed state” when it reaches the preset constant speed. When the preceding aircraft stops at 829, the setting is switched to the next engine to the preceding aircraft at 8330, and thereafter, the process is shifted to 806 as the preceding aircraft to perform the terminal pressure constant control. In addition, during the parallel request waiting state (automatic standby) in 823-824, the preceding machine failed or underflowed. Four

If it stops due to detection, switch the setting of the next engine to the preceding machine in 8 25 to prepare for the next start. The above is the processing as the next engine for realizing the time charts in Figs. 6 and 7.

According to the above-described embodiment, the turbomachine is constituted by two turbomachines and two inverters for driving the turbomachines one by one. These inverters are provided with a microcomputer, a status display unit and a control constant setting unit. The control constant setting unit is set in advance so as to operate based on the load state by receiving a signal of a sensor group for detecting a load state of the turbo machine, and the operation state and the failure state are mutually performed. Are connected by the minimum number of signal lines, and the two inverters take control of each other while performing constant control of the estimated terminal pressure. A "parallel start request" signal is provided in the system, and when the preceding machine detects a parallel operation start condition, the parallel start request signal is output to the inactive inverter to start the inactive inverter and the inactive inverter Starts up Output the "autonomous driving" signal, gradually increase the speed with the preset acceleration, and reach the predetermined constant speed (preferably the maximum speed), and send the "parallel constant speed status" signal to the preceding machine. The preceding machine controls the speed change operation so that the target pressure on the first discharge side becomes constant until the inverters started in parallel change from "automatic operation" to "parallel constant speed state". Then, when the next engine that started in parallel enters the “parallel constant speed state” operation, the preceding unit performs speed change operation so that the estimated terminal pressure is controlled constant along the target pressure on the discharge side of the second unit. In the parallel release control, during the parallel operation, the next engine is operating at a constant speed, so the preceding engine, which is shifting at a constant estimated terminal pressure, has its own rotation speed and load side pressure. As a result, a preset parallel release condition can be detected, and the parallel release condition Monitors the pressure when the machine reaches the minimum speed, stops the preceding machine when it reaches the stop pressure, outputs it to the next engine, and receives the "automatic standby" signal for the next engine operating at constant speed Is set in advance from constant speed operation. Since the variable speed operation is performed so that the estimated terminal pressure is kept constant along the target discharge pressure of the first unit, even if it is a dual inverter, the parallel operation can be started with only the preceding inverter. Stop conditions can now be detected.

In the control of the transient state during parallel start, when the preceding machine detects the parallel operation start condition, it issues a start request to the inactive inverter and starts the inactive inverter, and the preceding machine starts parallel operation. The inverter that has started the parallel operation at the maximum target pressure on the discharge side of the first unit performs constant-speed control until the inverter reaches the parallel constant-speed state. Then, while changing the discharge target pressure along the discharge side target pressure of the second unit, the gearshift operation is performed so that the estimated terminal pressure is kept constant. By not updating the target pressure on the discharge side of the preceding machine until the pressure becomes stable, it is possible to suppress the divergence of the control state and perform stable pressure control.

In addition, the signal that connects the two inverters includes the one that is stopped due to a failure, and this signal is represented by the same state as the state that is output when the inverter is turned off. It is now possible to jump over a fault without separately taking in the trip signal of the earth leakage breaker.

In addition, a mode switch is provided to connect the manual and automatic signals to the external input terminals of the two inverters. In Fig. 4, DI 5 is turned on and DI 6 is turned off, and the "automatic" By turning DI5 OFF and DI6 ON, "manual" and by turning both DI5 and DI6 OFF or ON, "OFF" It is now possible to make the control state of Invark the same.

In addition, malfunctioning of simultaneous operation when power is turned on or when power is restored after a power failure by setting one external input terminal of one of the two inverters, for example, to short-circuit and setting it as a “priority device”. Can be prevented, and by using external terminals It has become easier to set priority machines.

In addition, since a complete duplex system is configured by the first system and the second system, and a fault backup is taken, the reliability can be further improved.

In addition, a program for operating the inverter according to the load operation pattern is installed in the inverter in advance, and based on the program, the inverter is set to operate by the setting unit of the inverter. When the load state detection means detects the starting pressure, the inverter set as the priority machine starts, and the underload detection means detects the underload state of underload and stops when the stop condition is established. Therefore, it is possible to perform alternate operation or alternate / parallel operation without the need for an external communication circuit and complicated arrangement logic when connecting two inverters. It is compact, lightweight and low cost. In addition, reliability is improved because the number of parts is reduced. In addition, short-circuits and short-circuits in the main circuit are monitored by the ground fault circuit breaker, and other fault conditions on the load side are monitored by the inverter itself due to changes in the partial state of the inverter. Switching operation at the time of abnormality can be reliably performed. Furthermore, since the priority timing unit can be set externally by an inverter and the start timing is shifted, the operation order is not disturbed (for example, when power is restored).

Furthermore, since a retry operation at the time of failure is added, the failure state can be detected reliably.

Furthermore, since the pressure sensor for detecting the load condition and the pressure sensor for detecting the suction side pressure can be shared by two inverters, it is simple and inexpensive. Industrial applicability

According to the present invention, two inverters can be used with minimum signal integration. Turbo machine drive unit and its application equipment that can be operated in a coordinated manner by exchanging signals between them, so that external control devices are not required, and simple, compact, lightweight and low cost can be achieved. Can be obtained.

Claims

The scope of the claims

1. The speed of the turbomachine, comprising at least two turbomachines, at least two inverters each driving the turbomachine, and a plurality of sensors for detecting a load state of the turbomachine. In a turbomachine driving device for controlling, the inverters are connected to each other by at least four types of interlocking signals indicating an operating state, and the signals of the plurality of sensors are at least connected to the two units. The inverter takes in common and at least the two inverters control the turbomachine speed by judging at least operation stop, independent operation, alternate operation, and parallel operation according to the interlock signal. Turbomachinery drive.

The turbomachine driving device according to claim 1, wherein the turbomachine is a turbo pump.

The turbomachine driving device according to claim 1, wherein the turbomachine is a turbo blower.

The turbomachine driving device according to claim 1, wherein the four kinds of interlocking signals are mutually transmitted and received between the inverters by two output signals and two input signals. .

The four kinds of interlocking signals are a parallel start request for starting the inactive inverter, in which one of the inverters is in operation and the other is inactive. A signal and an output from the other inverter to the one inverter from the other inverter until the speed becomes a predetermined constant speed after the other inverter at rest, following the one inverter during operation, is activated. An automatic driving signal, a parallel constant speed state signal output from the other inverter to the one inverter when the other inverter is operating at a predetermined constant speed, Said one The method according to claim 1, wherein when one or both of the one or the other inverters is in a stopped state, the signal comprises an operation stop signal output from the stopped inverter to the other inverter. Item 7. A turbomachine driving device according to Item 1. The automatic stop signal includes a signal indicating that the inverter is stopped due to a failure and a signal indicating that the inverter is stopped due to power interruption as the same state signal. 6. The turbomachine driving device according to claim 5, wherein

The inverter is driven by the one inverter until the other inverter, which is subsequently started in parallel, transmits the automatic operation in-operation signal and then transmits the parallel constant speed state signal. Means for performing a speed change operation for controlling the discharge side target pressure of the turbomachine so as to be constant; and, when the other inverter transmits the parallel constant speed state signal, the discharge side target pressure in the two-parallel operation at the time of the parallel operation. Means for speed-changing the turbomachine so that the estimated terminal pressure is controlled to be constant along with the other inverter, while the turbomachine driven by the other inverter is in parallel operation at constant speed operation. Means for detecting a preset parallel release condition based on the rotational speed of the turbomachine operating at a constant discharge side pressure and the pressure on the load side; and detecting the other parallel release condition when the parallel release condition is detected. Means for outputting the automatic stop signal during the parallel operation, wherein the other inverter is replaced with a preset one in place of the constant speed operation control when the automatic stop signal is received during the parallel operation. 6. The turbomachine driving device according to claim 5, further comprising: means for performing a speed change operation so that the estimated terminal pressure is controlled to be constant along the discharge-side target pressure during operation.

The mode of the two inverters can be set by connecting a manual and fully automatic mode switch to the external input terminals of the two inverters in common and making the input terminals dedicated to mode switching. It is important to keep the state at the same level 2. The turbomachine driving device according to claim 1, wherein the turbomachine driving device is easily realized.

9. Each of the inverters is provided with an external input terminal for determining which of the two inverters is to be preferentially operated first when the sensor detects a predetermined starting state. The turbomachine driving device according to claim 1, wherein a turbomachine driven by an inverter whose terminals are short-circuited is set as a priority machine.

10. The turbomachine drive device according to claim 1, wherein a double system is configured by the first system and the second system.

1 1. At least two turbomachines, at least two inverters that drive the turbomachines one by one, and the load state of the turbomachines is detected and shared by the inverters. A plurality of sensors for outputting the detection signal to control the turbomachine, wherein when the sensor detects a predetermined starting state, an inverter set as a priority machine in advance is provided. When the priority machine detects the parallel operation start condition, the inverter that drives the priority machine issues a start request to the inactive inverter to start the next engine driven by the inactive inverter. When the priority unit is started, the discharge pressure constant control is performed at the discharge-side maximum target pressure during operation of one unit until the next engine driven by the parallel-started inverter reaches the parallel constant speed state. Speed change operation with an inverter When the next engine started in parallel enters parallel constant-speed operation, the priority unit performs speed-change operation so that the estimated terminal pressure is kept constant along the discharge-side target pressure during parallel operation. When the parallel release condition is detected based on the detection signal of the sensor, the operation of the priority unit is stopped, the priority unit is set as the next engine, and the next unit is set as the preceding unit, and the sensor is set. If the vehicle detects a predetermined underload condition, it is necessary to stop the preceding aircraft and replace the relationship between the preceding aircraft and the next engine. And a control method for a turbomachine driving device.

12.2 Two turbomachines, two inverters that drive the turbomachines one by one, and a plurality of turbomachines that detect the load state of the turbomachines and output the detection signal to the inverters in common In the control of the turbo δ machine provided with a sensor, when only one of the two inverters is operated and the other inverter is inactive, the operating inverter is set to the preceding machine. When the preceding machine detects the parallel operation start condition, the inverter that drives the preceding machine issues a start request to the inactive inverter, and the next engine driven by the inactive inverter is started. The preceding machine is shifted so that the discharge pressure during single-unit operation is controlled to the discharge pressure constant control at the maximum target pressure until the next engine that starts in parallel runs at the parallel constant speed state. The next engine started When the parallel constant-speed operation is performed, the gears are shifted so that the estimated terminal pressure is controlled to be constant along the discharge-side target pressure in the parallel operation of two units, and the parallel operation is released based on the detection signal of the sensor during parallel operation. When the condition is detected, the operation of the preceding machine is stopped and the relationship between the preceding machine and the next engine is replaced.When the sensor detects a predetermined underload condition, the inverter set in the preceding machine is reset. A method for controlling a turbomachine driving device, characterized by stopping the operation and exchanging the relationship between the preceding machine and the next engine.

0 1 3. Turbo machine for controlling the speed of the turbo machine, comprising a plurality of turbo machines, a plurality of inverters each for driving the turbo machine, and a plurality of sensors for detecting a load state of the turbo machine. In the mechanical drive device, the inverters are connected to each other by a plurality of types of connection signals indicating operating states, and the signals of the plurality of sensors are commonly used by the plurality of inverters. Intake and the plurality of inverters are stopped at least by one another, independent operation, alternate operation, parallel operation Turbomachine drive device for judging operation and controlling speed of the turbomachine