JPH09222069A - Method for starting hydraulic power machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly reach a target running state even when a guide vane fails at the time of starting by measuring a guide vane opening degree and opening the guide vane after correcting an opening degree operation amount based on a difference between a target guide vane opening degree and an actual guide vane opening degree. SOLUTION: When a starting instruction is issued from a main machine, first water is supplied up to the upstream side of a guide vane. Then, a pressure equivalent to a target guide vane opening degree is applied to a servo motor and the guide vane is opened by a hydraulic cylinder. At this time, a measurement rotational speed detected by a rotational speed detecting means 12 is compared with a target rotational speed and a guide vane opening degree operation amount proportional to its difference is calculated by a calculating means 13. A difference is also calculated between a measured guide vane opening degree measured by a guide vane opening degree measuring means 14 and the target guide vane opening degree, a guide vane opening degree operation amount is corrected by a guide vane opening degree operation amount correcting means 15 based on the difference and a guide vane opening/closing mechanism 16 is controlled based on the corrected value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a hydraulic machine such as a water turbine or a pump turbine, and more particularly to a method for starting a hydraulic machine in which a rotational speed is controlled to increase by opening and closing a guide vane.

[0002]

2. Description of the Related Art FIG. 13 shows a Francis turbine as an example of a general hydraulic machine. In the water turbine having such a structure, during power generation operation, high-pressure water from an unillustrated upper pond is introduced into the casing 3 from the penstock 1 through the inlet valve 2. The high-pressure water that has flowed into this casing has its flow rate adjusted by the guide vanes 4 adjusted to a predetermined opening degree, and then flows into the runner 5 to rotate the runner 5 to transfer energy. The bypass valve 6 is for balancing the pressures on the upstream side and the downstream side of the inlet valve 2 to facilitate opening and closing of the inlet valve 2.

The start of such a water turbine is performed as follows. As shown in FIGS. 14 and 15, first, when a command S1 for starting the main engine is issued at time T1, the bypass valve 6 is opened from the fully closed state as shown in FIG. It will be fully opened. As a result, the pressure water in the penstock 1 also flows into the downstream side of the inlet valve 2 via the bypass valve 6, and the water pressures on the upstream side and the downstream side of the inlet valve 2 become equal.

Thereafter, as shown in FIG. 15 (b), the inlet valve 2 is opened from the fully closed state and fully opened at time T3. Then, in response to the guide vane opening operation command S2, the guide vane 4 is opened from the target rotation speed N1 to the calculated opening G1 as shown in FIG. 15C (first valve opening step S3). Then, after a short time from the opening of the valve of the guide vane 4, FIG.
The runner 5 starts rotating as shown in (e). afterwards,
The rotation speed is measured every predetermined step time Δt (S
4) The measured rotation speed is compared with the target rotation speed (S5), and the guide vane opening operation amount proportional to the difference is calculated by the guide vane opening operation amount calculation step S6. The valve is opened in the second valve opening step S7 according to the calculated guide vane opening operation amount. Then, by repeating the rotation speed detection step S4 to the second valve opening step S7 (S8), the guide vane is opened to the no-load opening G0 at time T0, and the rotation speed reaches the specified speed N0 (S9). Control to do so.

[0005]

The opening / closing operation of the guide vane 4 is performed by the guide vane opening / closing mechanism as shown in FIG.
Done by 16. Such a guide vane opening / closing mechanism
In 16, when the guide vane opening operation command is received, the servo motor 10 is activated to send pressure oil to the hydraulic cylinder 9.
When the pressure oil is sent to the hydraulic cylinder 9, the guide ring 8 connected to the piston shaft 9a of the hydraulic cylinder 9 rotates, and the guide vane 4 moves through the guide vane link mechanism 7.
The guide vane 4 is opened and closed.

In such a guide vane opening / closing mechanism 16, if the state in which the water turbine, which is the main engine, is stopped continues for a long time, the pressure oil in the hydraulic cylinder 9 is not loaded with pressure as shown in FIG. The air contained in the pressure oil is separated, and the air layers 11a and 11b are present above the hydraulic cylinder 9. Even if the air cylinders 11a and 11b are activated in the hydraulic cylinder 9 and start the operation, as shown in FIG. 18, until the air cylinder 11a is compressed and is contained in the pressure oil and disappears. Since the driving force is not generated, the guide vane 4 is not opened. Therefore, the startup operation could not be performed smoothly as shown in FIG. That is, even if the guide vane opening operation command S2 is issued at time T3, the guide vane opening operation does not operate until time T4 when the air layer 11a in the hydraulic cylinder 9 disappears. Therefore, from the time point T3 to T4, only the target rotation speed and the guide vane opening operation amount increase with time. Since the target rotation speed and the guide vane opening operation amount are set excessively at time T4, when the opening operation of the guide vane 4 starts, the guide vane opening sharply increases, and the rotation speed immediately after time T4. The rise will be very sharp.
Furthermore, when the opening operation of the guide vanes 4 is started, the air layer
It has been reported that the maximum rotation speed increases to about twice the specified rotation speed N0 because the opening degree becomes larger than the set value due to compression and discharge of 11b. Therefore, time T
After 4, the process of opening the guide vane opening and the process of closing the guide vane were repeated many times to control the rotation speed to the specified speed N0.

It is an object of the present invention to achieve a target operating state smoothly even if the guide vanes become inoperative at the start of activation without causing the rotational speed to become excessively high compared to the target rotational speed. It is to provide a reliable method of starting a hydraulic machine.

[0008]

According to a first aspect of the present invention, there is provided a method for starting a hydraulic machine equipped with a movable guide vane for adjusting a flow rate of high-pressure water for rotating a runner, in accordance with a guide vane opening operation command. First valve opening step of opening the guide vane with a guide vane, and thereafter a guide vane opening operation amount calculation step of detecting the rotation speed and calculating the guide vane opening operation amount proportional to the difference from the target rotation speed, An opening measurement step of measuring the guide vane opening and a guide vane by adding the difference between the measured guide vane opening measured in this opening measurement step and the target guide vane opening to the guide vane opening operation amount. A guide vane opening manipulated variable correction step for correcting the opening manipulated variable, a second valve opening step for opening the guide vane according to the corrected guide vane opening manipulated variable, and a rotation speed at a specified rotation speed. Reach And a second valve opening step are repeated until the rotation speed detection step and the second valve opening step are repeated, the measured guide vane opening degree and the target guide vane opening degree Since the guide vanes are opened according to the guide vane opening operation amount corrected by the difference, the rotation speed can be smoothly controlled to the target operating state without becoming excessive as compared with the target rotation speed.

According to a second aspect of the present invention, in a starting method of a hydraulic machine equipped with a movable guide vane for adjusting a flow rate of high-pressure water for rotating a runner, the guide vane is opened according to a guide vane opening operation command. A first valve opening step of
Rotation speed detection process that measures the rotation speed after a predetermined time has elapsed from the guide vane opening operation command, and guide vane opening operation amount that calculates the guide vane opening operation amount that is proportional to the difference between the measured rotation speed and the target rotation speed A calculation step, a second valve opening step of opening the guide vane according to the calculated guide vane opening operation amount, and a rotation speed detection step or a second valve opening step until the rotation speed reaches a specified rotation speed. It is proportional to the difference between the measured rotation speed and the target rotation speed after a predetermined time from the guide vane opening operation command, that is, after the air layer extinction time in the hydraulic cylinder obtained by measurement has elapsed. Since the guide vane opening operation amount is calculated and the guide vane is opened, the target operating state is smoothly achieved without the rotation speed becoming excessive compared to the target rotation speed. It can control.

According to a third aspect of the present invention, in a starting method of a hydraulic machine equipped with a movable guide vane for adjusting a flow rate of high-pressure water for rotating a runner, the guide vane is opened according to a guide vane opening operation command. A first valve opening step of
After that, the rotation speed detection step of measuring the rotation speed, the guide vane opening operation amount calculation step of calculating the guide vane opening operation amount proportional to the difference between the measured rotation speed and the target rotation speed, and the calculated guide vane The method further comprises a second valve opening step of opening the guide vane according to the operation amount of the opening degree, and a step of repeating the rotation speed detecting step to the second valve opening step until the rotation speed reaches a predetermined rotation speed. The increase rate of the target rotation speed is made small immediately after the guide vane opening operation command is issued, and is made large after reaching a predetermined rotation speed or after a predetermined time has elapsed from the guide vane opening operation command issuance. In such a starting method, the rate of increase of the target rotation speed is set to a small value while the guide vanes are not operating, so the rotation speed does not become excessive compared to the target rotation speed, and the target operating state is smoothly controlled. it can.

According to a fourth aspect of the present invention, in the hydraulic machine starting method according to the third aspect, the target rotation speed is kept constant at a predetermined rotation speed lower than the specified rotation speed immediately after the guide vane opening operation command is issued. However, after reaching the predetermined rotation speed, or after a predetermined time has elapsed from the guide vane opening operation command issuance, the target rotation speed is increased.
It has the same operation and effect as the invention corresponding to claim 3.

According to a fifth aspect of the present invention, in a method of starting a hydraulic machine equipped with a movable guide vane for adjusting the flow rate of high-pressure water for rotating a runner, the guide vane is opened in response to a guide vane opening operation command. A first valve opening step of
After that, the rotational speed detection step of measuring the rotational speed, the rotational speed difference determination step of determining whether the measured rotational speed is smaller than the target rotational speed and the difference thereof is larger or smaller than a predetermined value, and the difference is predetermined. If the difference is smaller than a predetermined value, the guide is proportional to the difference between the measured rotation speed and the target rotation speed. A guide vane opening manipulated variable calculation process for calculating the vane opening manipulated variable, a second valve opening process for opening the guide vane according to the calculated guide vane opening manipulated variable, and a rotation speed at a specified rotation speed. And the step of repeating the rotation speed detecting step to the second valve opening step until the rotation speed is reached. In such a starting method, the increase of the target rotation speed is suppressed to a predetermined rotation speed while the guide vane is not operating, so that the rotation speed does not become excessively large compared to the target rotation speed and the target operation state is smoothly performed. Can be controlled.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method for starting a hydraulic machine according to the present invention will be described with reference to the drawings. Here, a water turbine will be described as an example of the embodiment.

(First Embodiment) A first embodiment will be described with reference to FIGS. 1 to 4. The form of the first embodiment corresponds to the invention described in claim 1. 1 is a flowchart of the present embodiment, FIG. 2 is a control block diagram, and FIG. 3 is a time line diagram. Here, FIG. 3 shows the case where the air layer disappearance time is Td. As shown in FIGS. 1 to 3, first, time T1
When the start command S1 for the main engine is issued, the same process as the conventional start method is followed, and the high-pressure water in the upper pond is filled up to the upstream of the guide vane 4. After that, at time T3, the guide vane opening operation command S2 is issued, and the target guide vane opening degree (here, the no-load opening degree) is applied to the pressure oil of the servomotor 10 to perform the guide vane opening operation in the first valve opening step S3. A pressure equivalent to is applied and oil is sent to the hydraulic cylinder 9. After the step time Δt from the time T3, the rotation speed detecting means 12 measures the rotation speed (S4), compares the measured rotation speed with the target rotation speed (S5), and the guide vane opening degree proportional to the difference. Operation amount is guide vane opening operation amount calculation means 13
(S6).

Further, the guide vane opening measuring means 14 measures the guide vane opening degree (S10), and the guide vane opening manipulated variable correcting means 15 determines the difference between the measured guide vane opening degree and the target guide vane opening degree. The guide vane opening operation amount is added to the guide vane opening operation amount to be corrected (S11).
When the corrected guide vane opening operation amount is obtained, the second
In order to perform the guide vane opening operation in the valve opening step S7, the pressure oil of the servomotor 10 is additionally loaded with a pressure corresponding to the target guide vane opening degree, and the guide vane 4 is opened. Then, the rotation speed can reach the specified speed N0 by repeating (S12) between the rotation speed detection step S4 and the second valve opening step (S7).

According to such a starting method, the guide vanes 4 are opened according to the manipulated variable of the guide vane opening degree corrected by the difference between the measured guide vane opening degree and the target guide vane opening degree. Actually, the guide vane opening operation amount is determined on the basis of the measured guide vane opening. Therefore, even if the guide vanes 4 become inoperative at the start of activation and a large difference is generated between the target rotation speed and the measured rotation speed, the guide vane opening operation amount proportional to this difference is not generated, but the measurement guide vane opening amount is set. Since the valve is opened with the guide vane operation amount according to the degree, the rotation speed can be smoothly controlled to the target operating state without becoming excessive compared with the target rotation speed.

(Second Embodiment) A second embodiment will be described with reference to FIGS. 4 and 6. The second embodiment corresponds to the invention described in claim 2. FIG. 4 is a flowchart of the embodiment, FIG. 5 is a control block diagram, and FIG.
Is a time diagram. Here, in FIG. 6, the air layer disappearance time is Td.
Is the case. As shown in FIGS. 4 to 6, first, a time point T
When the start command for the main engine is issued to the first engine, the same process as the conventional start method is followed, and the high pressure water in the upper pond is filled up to the upstream of the guide vane 4. After that, at time T3, the guide vane opening operation command S2 is issued, and the target guide vane opening degree (here, no-load opening degree) is applied to the pressure oil of the servomotor 10 to perform the guide vane opening operation in the first valve opening step S3. A pressure equivalent to is applied and oil is sent to the hydraulic cylinder 9. After that, the control of the guide vane opening operation is held for a predetermined time Td by the time holding means 17 (S13), and at the time point T4, the rotation speed is measured by the rotation speed detecting means 12 (S4). Is compared with the target rotation speed (S5), the guide vane opening operation amount proportional to the difference is calculated by the guide vane opening operation amount calculating means 13 (S6), and the pressure proportional to the operation amount is controlled by the servo. The pressure oil of the motor 10 is additionally loaded to open the guide vane 4 (S7). Then, at every predetermined time Δt, the rotation speed measurement S4 to the second valve opening step (S
By repeating the step 7) (S8), the rotation speed can reach the specified speed N0.

Here, Td is the hydraulic cylinder 9 when the pressure oil is loaded with a pressure corresponding to the target guide vane opening.
It is the time until the air layers 11a and 11b in the inside are completely contained in the oil phase or discharged from the hydraulic cylinder 9, and is the time obtained by measurement in advance. According to such a starting method, the guide vane opening operation amount proportional to the difference between the measured rotation speed and the target rotation speed is calculated after the air layer disappearance time in the hydraulic cylinder 9 has elapsed, and the guide vane 4 is opened. By repeating the steps described above, even if the guide vanes 4 become inoperative at the start of startup, the new guide vane opening operation amount is not calculated and the guide vane opening opening / closing operation is not performed during that time. The target operating state can be smoothly controlled without becoming excessive compared with the target rotation speed.

(Third Embodiment) A third embodiment will be described with reference to FIGS. 7 and 9. The third embodiment corresponds to the invention described in claim 3. 7 is a flowchart of this embodiment, FIG. 8 is a control block diagram, and FIG. 9 is a time line diagram. Here, FIG. 9 shows the case where the air layer disappearance time is Td. As shown in FIGS. 7 to 9, first, time T1
When the start command S1 is issued, the high pressure water in the upper pond is filled up to the upstream of the guide vane 4 by following the same steps as the conventional start method. After that, at time T3, the guide vane opening operation command S2 is issued, and the target guide vane opening degree (here, the no-load opening degree) is applied to the pressure oil of the servomotor 10 to perform the guide vane opening operation in the first valve opening step S3. A pressure equivalent to is applied and oil is sent to the hydraulic cylinder 9. After that, the rotation speed detection means 12 measures the rotation speed for each step time Δt (S4), the measured rotation speed is compared with the target rotation speed (S5), and the guide vane opening degree operation is proportional to the difference. The amount is calculated by the guide vane opening operation amount calculating means 13 (S6), and the pressure proportional to this operation amount is added to the pressure oil of the servomotor 10 to open the guide vane 4 (S7). Then, the rotation speed can reach the specified speed N0 by repeating the rotation speed measurement S4 and the second valve opening step S7 (S14).

Here, in the present embodiment, immediately after the guide vane opening / closing operation command S2 is issued, the rate of increase ΔN1 of the target rotation speed is set smaller than in the conventional case, and the predetermined rotation speed N is set.
After reaching e, the increase rate ΔN2 of the target rotation speed is set to a large value (S15). The predetermined rotation speed Ne is preferably 50% or less of the specified rotation speed. Therefore, the increase rate ΔN1 of the target rotation speed may be set to be equal to or lower than the increase rate that reaches the rotation speed Ne in the air layer extinction time Td in the hydraulic cylinder, which is obtained by measurement in advance.

According to such a starting method, the increase rate of the target rotation speed immediately after the guide vane opening operation command is issued is set to a small value so that the guide vane opening / closing operation tends to be inoperative. As a result, the increase in the rotation speed is suppressed, and the maximum rotation speed can be suppressed to the specified rotation speed N0 or less.
Therefore, it is possible to smoothly control the target operating state without causing the rotation speed to become excessively high compared to the target rotation speed.

Further, another embodiment will be described with reference to FIG. This embodiment corresponds to claim 4.
Instead of setting a small increase rate of the target rotation speed immediately after issuing the guide vane opening / closing operation command S2, the target rotation speed is set to the predetermined rotation speed during the air layer extinction time Td in the hydraulic cylinder obtained by measurement in advance. After being kept constant at Ne, after the rotation speed reaches Ne, control is performed according to the target rotation speed as in the conventional case.

Therefore, the same effect as that of the third embodiment is obtained. Further, even when the rising rate is changed, instead of the predetermined rotation speed Ne, even after the air layer extinction time Td elapses, the same effect is obtained.

(Fourth Embodiment) A fourth embodiment will be described with reference to FIGS. 11 and 12. The fourth embodiment corresponds to the invention described in claim 5. FIG. 11 is a flowchart of this embodiment, and FIG. 12 is a control block diagram.
The time diagram is the same as FIG. 10 shown in the other embodiments of the third embodiment. As shown in FIGS. 11 and 12, when the start command S1 for the main engine is issued at time T1, first, the same steps as the conventional start method are followed, and the high pressure water in the upper pond is filled up to the upstream of the guide vane 4. To be watered. After that, at time T3, the guide vane opening operation command S2 is issued, and the target guide vane opening degree (here, the no-load opening degree) is applied to the pressure oil of the servomotor 10 to perform the guide vane opening operation in the first valve opening step S3. A pressure equivalent to is applied and oil is sent to the hydraulic cylinder 9. From time T3, the rotation speed is measured by the rotation speed detection means 12 at every step time Δt (S4), and the measured rotation speed is smaller than the target rotation speed, and the difference is larger or smaller than a predetermined value Nd. The speed determination means 18 determines in the rotational speed difference determination step S16. When the difference is larger than the predetermined value Nd, the rotation speed detecting step S4 and the rotation speed difference determining step S16 are repeated until it becomes smaller than Nd (S17), while the difference is the predetermined value Nd.
When it is smaller than d, the guide vane opening operation amount proportional to the difference between the measured rotation speed and the target rotation speed is calculated in the guide vane opening operation amount calculation step S6, and the calculated guide vane opening operation amount is set. Accordingly, the guide vane is opened in the second valve opening step S.
Open the valve at 7. Then, from the rotation speed detection step S4 to the second
By repeating the valve opening step S7 (S18), the rotation speed reaches the specified rotation speed N0. Here, it is desirable that the predetermined difference Nd between the measured rotation speed and the target rotation speed is, for example, an increase amount of the target rotation speed in two step times, but at most 50% or less of the specified rotation speed N0. Good. According to such a starting method, the increase of the target rotation speed is suppressed to a predetermined rotation speed while the guide vane is not operating, so that the rotation speed does not become excessively large compared to the target rotation speed and the target rotation speed is smoothly increased. It can be controlled to the operating state.

[0025]

As described above, according to the present invention, even if the guide vanes become inoperative at the start of starting, the rotation speed does not become excessively high compared to the target rotation speed, and the target operation state is smoothly achieved. It is possible to provide a highly reliable method of starting a hydraulic machine that can reach

[Brief description of drawings]

FIG. 1 is a flowchart of a first embodiment of the present invention.

FIG. 2 is a start control block diagram according to the first embodiment of this invention.

FIG. 3 is a time line diagram of the first embodiment of the present invention.

FIG. 4 is a flowchart of the second embodiment of the present invention.

FIG. 5 is a start control block diagram according to a second embodiment of this invention.

FIG. 6 is a time diagram of the second embodiment of the present invention.

FIG. 7 is a flowchart of the third embodiment of the present invention.

FIG. 8 is a start control block diagram according to a third embodiment of this invention.

FIG. 9 is a time line diagram of the third embodiment of the present invention.

FIG. 10 is a time diagram of another embodiment of the third embodiment of the present invention.

FIG. 11 is a flowchart of the fourth embodiment of the present invention.

FIG. 12 is a start control block diagram according to a fourth embodiment of this invention.

FIG. 13 is a sectional view of a general hydraulic machine.

FIG. 14 is a flowchart of a conventional method for starting a hydraulic machine.

FIG. 15 is a time diagram of a conventional assumed starting method of a hydraulic machine.

FIG. 16 is a structural explanatory view of a guide vane opening / closing mechanism of a general hydraulic machine.

FIG. 17 is a view showing a state inside the hydraulic cylinder when the main engine is stopped.

FIG. 18 is a diagram showing an operating state in the hydraulic cylinder from time T3 to time T4.

FIG. 19 is a time diagram according to a conventional starting method when the main engine is stopped for a long time.

[Explanation of symbols]

 2 ... Inlet valve 3 ... Casing 4 ... Guide vane 6 ... Bypass valve 7 ... Guide vane link mechanism 8 ... Guide ring 9 ... Hydraulic cylinder 9a ... Piston shaft 10 ... Servo motor 11 ... Air layer 12 ... Rotation speed detection means 13 ... Guide Vane opening manipulated variable calculating means 14 ... Guide vane opening measuring means 15 ... Guide vane opening manipulated variable correcting means 16 ... Guide vane opening / closing mechanism 17 ... Time holding means 18 ... Rotation speed judging means

Claims (5)

[Claims] 1. A method for starting a hydraulic machine including a movable guide vane for adjusting a flow rate of high-pressure water for rotating a runner, comprising: a first valve opening step of opening a guide vane in response to a guide vane opening operation command. , Then detecting the rotation speed, a guide vane opening operation amount calculation step of calculating the guide vane opening operation amount proportional to the difference with the target rotation speed, and an opening measurement step of measuring the guide vane opening degree, Guide vane opening operation amount for correcting the guide vane opening operation amount by adding the difference between the measured guide vane opening amount measured in this opening measurement step and the target guide vane opening operation amount to the guide vane opening operation amount A correction step, a second valve opening step of opening the guide vane according to the corrected guide vane opening operation amount, and a rotation speed detection step or a second valve opening step until the rotation speed reaches a specified rotation speed. A method for starting a hydraulic machine, comprising the steps of: 2. A starting method of a hydraulic machine equipped with a movable guide vane for adjusting the flow rate of high-pressure water for rotating a runner, comprising a first valve opening step of opening the guide vane in response to a guide vane opening operation command. , Rotating speed detection process to measure the rotating speed after a predetermined time has passed from the guide vane opening operation command, and guide vane opening operation to calculate the guide vane opening operation amount proportional to the difference between the measured rotating speed and the target rotating speed Amount calculation step, a second valve opening step of opening the guide vane according to the calculated guide vane opening operation amount, and the rotational speed detection step or second valve opening step until the rotational speed reaches a specified rotational speed A method for starting a hydraulic machine, comprising the steps of repeating and. 3. A first valve opening step of opening a guide vane in response to a guide vane opening operation command in a method of starting a hydraulic machine having a movable guide vane for adjusting a flow rate of high-pressure water for rotating a runner. , Then the rotation speed detection step of measuring the rotation speed, the guide vane opening operation amount calculation step of calculating the guide vane opening operation amount proportional to the difference between the measured rotation speed and the target rotation speed, and the calculated guide A second valve opening step of opening the guide vane in accordance with the vane opening operation amount, and a step of repeating the rotational speed detecting step to the second valve opening step until the rotational speed reaches a specified rotational speed are provided. , The rate of increase of the target rotation speed is reduced immediately after the guide vane opening operation command is issued, and increased after reaching the predetermined rotation speed or after the elapse of a predetermined time from the guide vane opening operation command issuance. A method of starting a hydraulic machine characterized by things. 4. Immediately after the guide vane opening operation command is issued, the target rotation speed is kept constant at a predetermined rotation speed, and after reaching the predetermined rotation speed, or after a predetermined time has elapsed from the guide vane opening operation command issuance. The method for starting a hydraulic machine according to claim 3, wherein the target rotation speed is increased. 5. A starting method of a hydraulic machine equipped with a movable guide vane for adjusting a flow rate of high-pressure water for rotating a runner, comprising a first valve opening step of opening the guide vane in response to a guide vane opening operation command. , A rotational speed detection step of measuring the rotational speed after that, a rotational speed difference determination step of determining whether the measured rotational speed is smaller than the target rotational speed and the difference is larger or smaller than a predetermined value, and the difference is If it is larger than the predetermined value, the process of repeating the rotation speed detection process and the rotation speed difference determination process, and if the difference is smaller than the predetermined value, it is proportional to the difference between the measured rotation speed and the target rotation speed. Guide vane opening manipulated variable calculation process for calculating the guide vane opening manipulated variable, second valve opening process for opening the guide vane according to the calculated guide vane opening manipulated variable, and rotation speed is the specified rotation speed And a step of repeating the rotation speed detecting step to the second valve opening step until the rotation speed is reached.