Electric speed regulation system and speed regulation control method for water wheel power generation and pumped storage unit

Abstract

The invention relates to the technical field of hydroelectric generating sets, and discloses an electric speed regulation system and a speed regulation control method for a water wheel power generation and pumped storage unit. The electric speed regulation system comprises a power supply mechanism, a driving mechanism, a transmission mechanism, a stroke detection mechanism and a control mechanism. The transmission mechanism comprises a rotary motion body, a limiting body and a linear motion body, the driving mechanism is connected with one end of the rotary motion body, the linear motion body is slidably arranged in the limiting body, one end of the linear motion body is connected with the rotary motion body, the other end of the linear motion body is connected with a water turbine movable guide vane control ring, and the limiting body is used for limiting rotary motion of the linear motion body. The linear motion body linearly moves in the limiting body; the stroke detection mechanism is suitable for detecting the stroke of the linear motion body; the control mechanism is connected with the power supply mechanism, the driving mechanism and the stroke detection mechanism. The electric speed regulation system is driven by electric power, the unit can be controlled more quickly and more accurately, and the electric speed regulation system is simple in structure, few in fault point and low in maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of hydroelectric generator technology, specifically to an electric speed regulation system and speed control method for hydroelectric power generation and pumped storage units. Background Technology

[0002] Hydroelectric generator sets are widely distributed around natural water bodies such as rivers and lakes. They are devices that convert the gravitational potential energy of natural water flow into electrical energy and are among the most widely used and technologically mature renewable energy power generation devices. Pumped storage units are energy storage hydroelectric devices designed to solve the problem of power grid peak shaving and valley filling and to absorb clean energy. They are currently the most technologically mature and largest-scale long-term energy storage devices.

[0003] The stable operation of hydro-turbine generator units and pumped storage units relies on the regulation of the speed control system. The main functions of the speed control system are as follows:

[0004] (1) Maintaining stable speed: Since the load of the power grid system changes constantly, the frequency of the power grid system will change. The core task of the speed regulation system is to adjust the output power of the unit to keep the unit speed at the rated value, thereby ensuring that the frequency of the output power meets the power supply requirements.

[0005] (2) Realize unit operation: The speed control system can also automatically or manually complete the start-up, shutdown, emergency shutdown, load increase and decrease of the unit to meet the operation needs of the hydropower station under different working conditions.

[0006] (3) Ensuring system stability: In the power system, the speed regulation system plays a key role in maintaining the active power balance, frequency stability and ensuring the safe and stable operation of the power system, which helps to improve the reliability and stability of the power system.

[0007] Currently, large and medium-sized hydro-turbine generator units and pumped storage units all use hydraulic speed control systems. However, hydraulic speed control systems have complex structures, high failure rates, and require multiple shutdowns for maintenance. Moreover, hydraulic systems have slow response speeds and are not precise enough, which can also prevent the units from operating at their optimal state under various working conditions. Summary of the Invention

[0008] In view of this, the present invention provides an electric speed regulation system and speed regulation control method for hydropower generation and pumped storage units, in order to solve the problems of complex structure, high failure rate and slow response speed and insufficient accuracy of hydraulic speed regulation systems.

[0009] In a first aspect, the present invention provides an electric speed regulation system for hydroelectric power generation and pumped storage units, comprising:

[0010] Power supply mechanism;

[0011] The drive mechanism is electrically connected to the power supply mechanism.

[0012] A transmission mechanism includes a rotating motion body, a limiting body, and a linear motion body. The driving end of the driving mechanism is connected to one end of the rotating motion body to drive the rotating motion body to rotate. The linear motion body is slidably disposed within the limiting body, and one end of the linear motion body is connected to the other end of the rotating motion body. The other end of the linear motion body is connected to the turbine movable guide vane control ring. The limiting body is used to restrict the rotational movement of the linear motion body, so that the linear motion body moves linearly within the limiting body along the axial direction of the rotating motion body to push / pull the turbine movable guide vane control ring.

[0013] A stroke detection mechanism, wherein the stroke detection mechanism is adapted to detect the stroke of the linear motion body;

[0014] A control mechanism is connected to the power supply mechanism, the drive mechanism, and the stroke detection mechanism.

[0015] Beneficial effects

[0016] The electric speed control system supplies power to the drive mechanism via a power supply unit. The power output from the drive mechanism is transmitted through a transmission mechanism to push / pull the control ring of the turbine's movable guide vanes, ultimately achieving regulation of the unit. The electric speed control system uses electric drive, enabling faster and more precise control of the turbine's movable guide vane control ring. Furthermore, it has a simpler structure, fewer potential failure points, is less prone to malfunctions, and has lower maintenance costs.

[0017] In an optional embodiment, the rotary motion body is a worm gear, the linear motion body is a worm sleeve, one end of the worm gear is connected to the drive end of the drive mechanism, and the other end is engaged with the worm sleeve. One end of the limiting body is fixedly connected to the drive mechanism, and the limiting body has a sliding groove, in which both the worm gear and the worm sleeve are located.

[0018] In an optional embodiment, both the inner wall of the groove and the outer wall of the worm gear sleeve are square.

[0019] Beneficial effects

[0020] The inner wall of the slide groove and the inner wall of the worm sleeve are both square in shape. This allows the slide groove to restrict the rotational movement of the worm sleeve, prevent it from rotating, and ensure that the worm sleeve only performs linear motion.

[0021] In an optional embodiment, the other end of the worm gear sleeve is provided with a pin hole, and the turbine movable guide vane control ring is connected to the pin hole.

[0022] Beneficial effects

[0023] A pin hole is provided in the worm gear sleeve to facilitate connection with the control ring of the turbine's movable guide vanes.

[0024] In an optional embodiment, the drive mechanism includes a drive motor and a reducer. The reducer is disposed on the wall of the turbine room, the drive motor is disposed on the reducer, and the power input end of the reducer is connected to the drive end of the drive motor, and its power output end is connected to one end of the rotating body.

[0025] In an optional embodiment, the reducer is a planetary gear reducer or a harmonic gear reducer.

[0026] In an optional embodiment, the control mechanism is a speed control cabinet, which is adapted to generate control commands based on the guide vane adjustment commands output by the host computer and output them to the power supply mechanism.

[0027] Beneficial effects

[0028] The speed control cabinet can calculate the parameters that the drive mechanism needs to change based on the guide vane adjustment command output by the host computer, and generate control commands to control the output parameters of the power supply mechanism, thereby changing the operating parameters of the drive mechanism.

[0029] In an optional embodiment, the power supply mechanism is a power cabinet, which is connected to the drive motor and the speed control cabinet. The power cabinet is adapted to adjust the parameters output to the drive motor according to the control command.

[0030] Beneficial effects

[0031] The power cabinet can adjust the output parameters of the drive motor according to the control commands output by the speed control cabinet, so as to adaptably and precisely adjust the position of the control ring of the turbine's moving guide vanes.

[0032] Secondly, the present invention also provides a speed control method for hydroelectric power generation and pumped storage units, applied to the speed control system of the aforementioned hydroelectric power generation and pumped storage units, comprising:

[0033] Input the target parameters into the control mechanism;

[0034] Calculate whether the stroke of the linear motion body needs to be increased or decreased based on the target parameters;

[0035] If the stroke of the linear moving body needs to be increased, the positive voltage U1 is increased in a single step.

[0036] Determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage;

[0037] If the output speed of the drive mechanism is zero and the voltage exceeds the rated voltage, the drive mechanism is de-energized and the process ends.

[0038] If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, then determine whether the stroke of the linear motion body has reached the limit.

[0039] If the linear motion body reaches the end of its stroke, the drive mechanism is de-energized, and the process ends.

[0040] If the linear motion body has not reached its full stroke, determine whether the output torque of the drive mechanism exceeds the rated torque.

[0041] If the output torque of the drive mechanism exceeds the rated torque, an alarm will sound and the process will end.

[0042] If the output torque of the drive mechanism is less than the rated torque, then return to the step of increasing the positive voltage U1 once.

[0043] If the stroke of the linear moving body needs to be reduced, the reverse voltage U2 is increased once;

[0044] Determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage;

[0045] If the output speed of the drive mechanism is zero and the voltage exceeds the rated voltage, the drive mechanism is de-energized and the process ends.

[0046] If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, then determine whether the stroke of the linear motion body has reached the limit.

[0047] If the linear motion body reaches the end of its stroke, the drive mechanism is de-energized, and the process ends.

[0048] If the linear motion body has not reached its full stroke, determine whether the output torque of the drive mechanism exceeds the rated torque.

[0049] If the output torque of the drive mechanism exceeds the rated torque, an alarm will sound and the process will end.

[0050] If the output torque of the drive mechanism is less than the rated torque, then return to the step of increasing the reverse voltage U2 once.

[0051] Beneficial effects

[0052] This method of speed control for hydroelectric and pumped storage units can accurately and quickly judge and adjust the stroke of a linear moving body according to target parameters, ensuring that the unit operates in the optimal state under various operating conditions.

[0053] In an optional embodiment, the target parameters in the step of inputting target parameters to the control mechanism include: target guide vane opening and travel speed. Attached Figure Description

[0054] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a front view of the electric speed regulation system for hydroelectric power generation and pumped storage units of the present invention;

[0056] Figure 2 This is a side view of the electric speed regulation system for the hydroelectric power generation and pumped storage units of the present invention;

[0057] Figure 3 This is a structural block diagram of the electric speed regulation system for hydroelectric power generation and pumped storage units of the present invention;

[0058] Figure 4 This is a flowchart of the electric speed control method for hydroelectric power generation and pumped storage units of the present invention.

[0059] Explanation of reference numerals in the attached figures:

[0060] 1. Power supply mechanism;

[0061] 21. Drive motor; 22. Reducer;

[0062] 31. Rotational motion body; 32. Limiting body; 33. Linear motion body;

[0063] 4. Travel testing agencies;

[0064] 5. Control mechanism. Detailed Implementation

[0065] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] In related technologies, large and medium-sized hydro-turbine generator units and pumped storage units currently all adopt hydraulic speed control systems. These systems mainly consist of a speed control cabinet, a relay unit, and a hydraulic device. The speed control cabinet is the core equipment of the speed control system, capable of receiving commands and amplifying signals to operate the actuators and ensure the unit speed is maintained within the rated range. Furthermore, it also handles the unit's start-up and shutdown operations, as well as the setting of speed control system parameters. The relay unit's main components include the cylinder, cylinder head, piston, piston rod, and sealing device. As the actuator of the speed control system, the relay unit adjusts the guide vane opening by controlling the turbine control loop, thereby changing the flow rate into the unit and regulating the unit's output power. The hydraulic device mainly consists of a pressure oil tank, a return oil tank, and an oil pump. The pressure oil tank stores oil and compressed air in a certain ratio, typically 1 / 3 oil and 2 / 3 compressed air, to ensure stable oil pressure. When the oil level in the pressure tank drops to the lower limit and the oil pressure is 0.2 to 0.3 MPa lower than the rated pressure, the oil pump will automatically start to pressurize the oil in the return tank into the pressure tank; conversely, when the oil level in the tank reaches the specified position and the pressure reaches the rated oil pressure, the oil pump will automatically shut down, and generally two oil pumps are set up as backups for each other.

[0070] The working principle of a hydraulic speed control system is as follows: When the electrical load changes, the unit's speed will deviate from the operating value. At this time, the sensitive element in the speed control cabinet can quickly detect the speed deviation and output a corresponding adjustment signal. Subsequently, the amplification element amplifies the overall adjustment signal, driving the relay to change the opening of the guide vanes, blades, or nozzles, thereby adjusting the unit's flow rate to match the unit's output power with the external load, ultimately restoring the speed to the operating value. In this process, the stabilizing element (also known as the feedback element) plays a crucial role, ensuring the stability of the control system. In addition, the hydropower station requires internal infrastructure such as turbine oil depots, oil filters, and oil pipelines to provide auxiliary functions such as hydraulic oil storage, transportation, and purification. A medium-pressure compressed air system is also needed to provide operating power for the speed control system.

[0071] It is evident that hydraulic speed control systems involve numerous components and have a complex structure, resulting in a higher failure rate and more potential points of failure. Components such as hydraulic valves, pressure gauges, and electrical parts within the speed control cabinet are prone to malfunction. Repairing or replacing these components increases costs. Furthermore, the significant inertia and response delay of hydraulic systems make it difficult to accurately and quickly control the guide vane opening, preventing the unit from achieving optimal efficiency under various operating conditions.

[0072] To address the aforementioned problems, this embodiment provides an electric speed regulation system and speed control method for hydroelectric power generation and pumped storage units. The following is a detailed explanation... Figures 1 to 4 The following describes embodiments of the present invention.

[0073] According to an embodiment of the present invention, an electric speed regulating system for a hydroelectric power generation and pumped storage unit is provided, comprising: a power supply mechanism 1, a drive mechanism, a transmission mechanism, a stroke detection mechanism 4, and a control mechanism 5. The power supply mechanism 1 is electrically connected to the drive mechanism. The transmission mechanism includes: a rotating motion body 31, a limiting body 32, and a linear motion body 33. The drive end of the drive mechanism is connected to one end of the rotating motion body 31 to drive the rotating motion body 31 to rotate. The linear motion body 33 is slidably disposed within the limiting body 32, and one end of the linear motion body 33 is connected to the other end of the rotating motion body 31. The other end of the linear motion body 33 is connected to the turbine's movable guide vane control ring. The limiting body 32 is used to restrict the rotational movement of the linear motion body 33, causing the linear motion body 33 to move linearly within the limiting body 32 along the axial direction of the rotating motion body 31 to push / pull the turbine's movable guide vane control ring. The stroke detection mechanism 4 is adapted to detect the stroke of the linear motion body 33. The control mechanism 5 is connected to the power supply mechanism 1, the drive mechanism, and the stroke detection mechanism 4.

[0074] Power supply mechanism 1 supplies power to drive mechanism, which uses the electrical output to drive the rotating body 31 to rotate. The rotating body 31 is connected to the linear body 33, enabling power transmission. However, due to the presence of a limit body 32, the rotational movement of the linear body 33 is restricted, so the linear body 33 can only perform linear movement. That is, the limit body 32 converts the rotational power output by the drive mechanism into linear driving force, allowing the linear body 33 to push or pull the turbine's movable guide vane control ring as it moves within the limit body 32.

[0075] The stroke detection mechanism 4 is preferably a stroke sensor, which can detect the stroke of the linear moving body 33.

[0076] The control mechanism 5 can acquire the stroke of the linear motion body 33 detected by the stroke detection mechanism 4 and the operating parameters of the drive mechanism in real time. It can also change the output parameters of the power supply mechanism 1 according to the instructions given by the host computer, thereby changing the operating parameters of the drive mechanism. The turbine's movable guide vane control ring will be pushed or pulled accordingly, which can change the opening of the guide vane and adjust the inflow of the unit so that the output power of the unit matches the external load.

[0077] This electric speed control system utilizes electric power, offering faster response and more sensitive reaction compared to hydraulic drive. The control mechanism 5 can also precisely adjust the turbine's guide vane control loop in real time based on the operating status of the power supply mechanism 1, the drive mechanism, and the linear motion body 33, ensuring that the unit's output power matches the external load and that the unit's operating efficiency reaches its optimal level under various operating conditions. Furthermore, the electric speed control system has fewer components, a simpler structure, and fewer potential failure points, reducing the frequency of downtime for maintenance and lowering maintenance costs.

[0078] In one embodiment, the drive mechanism includes a drive motor 21 and a reducer 22. The reducer 22 is disposed on the wall of the turbine room, the drive motor 21 is disposed on the reducer 22, and the power input end of the reducer 22 is connected to the drive end of the drive motor 21, and its power output end is connected to one end of the rotating body 31.

[0079] The reducer 22 is directly fixed to the wall of the turbine room for stable support. The drive motor 21 is arranged perpendicularly to the reducer 22 and is directly fixed on top of the reducer 22. The drive motor 21 is a DC motor with adjustable speed, large starting torque, and fast response, providing driving force for the reducer 22. The reducer 22 transmits the output speed of the drive motor 21 to the rotating body 31 after adjusting the speed, driving the rotating body 31 to rotate.

[0080] In one embodiment, the reducer 22 is a planetary gear reducer or a harmonic gear reducer.

[0081] The reducer 22 is preferably a planetary gear reducer or a harmonic gear reducer. These two types of reducers 22 have a larger specific speed and a larger output torque.

[0082] In one embodiment, the rotary motion body 31 is a worm, the linear motion body 33 is a worm sleeve, one end of the worm is connected to the drive end of the drive mechanism, and the other end is engaged with the worm sleeve. One end of the limiting body 32 is fixedly connected to the drive mechanism, and the limiting body 32 has a groove, in which both the worm and the worm sleeve are located.

[0083] One end of the worm gear is connected to the output shaft of the reducer 22, and the other end meshes with the worm sleeve. A sliding groove extending through both ends is provided on the limiting body 32. One end of the limiting body 32 is fixedly connected to the reducer 22, and the worm gear and worm sleeve extend into the sliding groove, with the worm sleeve slidably connected to the groove. Thus, when the output shaft of the reducer 22 drives the worm gear to rotate, it synchronously drives the worm sleeve to slide linearly within the sliding groove. The worm sleeve extends out of the limiting body 32 towards the side away from the reducer 22, pushing the turbine's movable guide vane control ring; conversely, the worm sleeve retracts from the limiting body 32 towards the side closer to the reducer 22, pulling the turbine's movable guide vane control ring. The direction of movement of the worm sleeve is determined by the rotation direction of the motor. In this embodiment, when the motor rotates forward, the worm sleeve pushes the turbine's movable guide vane control ring; when the motor rotates in reverse, the worm sleeve pulls the turbine's movable guide vane control ring.

[0084] In one embodiment, both the inner wall of the chute and the outer wall of the worm gear sleeve are square.

[0085] This groove can restrict the worm gear sleeve and prevent it from rotating.

[0086] Of course, in other embodiments, the groove can also be other shapes such as a regular hexagon.

[0087] Furthermore, a support component such as a copper sleeve or a lubricating material can be provided between the limiting body 32 and the worm sleeve.

[0088] In one embodiment, the other end of the worm gear sleeve is provided with a pin hole, and the turbine movable guide vane control ring is connected to the pin hole.

[0089] The end of the worm gear sleeve away from the reducer 22 is provided with a pin hole for connecting the control ring of the turbine's movable guide vane.

[0090] In one embodiment, the control mechanism 5 is a speed control cabinet, which is adapted to generate control commands based on the guide vane adjustment commands output by the host computer and output them to the power supply mechanism 1.

[0091] The speed control cabinet uses a high-performance microprocessor with multi-channel input / output interfaces. It can receive guide vane adjustment commands from the host computer, and also calculate and issue appropriate control commands based on the current operating parameters of the motor, such as the motor voltage, current, and speed, as well as the current position of the linear motion body 33, i.e., the stroke of the linear motion body 33. This changes the output parameters of the power supply mechanism 1, thereby altering the operating parameters of the drive mechanism and thus the stroke of the linear motion body 33, pushing or pulling the turbine's movable guide vane control ring.

[0092] In one embodiment, the power supply mechanism 1 is a power cabinet, which is connected to the drive motor 21 and the speed control cabinet. The power cabinet is adapted to adjust the parameters output to the drive motor 21 according to the control command.

[0093] Specifically, the power cabinet is equipped with a converter to convert the industrial frequency AC power into adjustable voltage and current. According to the control commands output by the speed control cabinet, the output voltage and current are adapted to change the motor direction, speed, torque or power.

[0094] According to an embodiment of the present invention, another aspect provides a speed control method for hydropower generation and pumped storage units, which is applied to the above-mentioned speed control system for hydropower generation and pumped storage units. The structure of the speed control system will not be described in detail here.

[0095] Speed ​​control methods include:

[0096] Input the target parameters into control mechanism 5;

[0097] Specifically, the host computer inputs the target parameters to the control mechanism 5. The target parameters include the target opening of the guide vane and the travel speed.

[0098] Calculate whether the stroke of the linear motion body 33 needs to be increased or decreased based on the target parameters;

[0099] Specifically, the stroke of the linear motion body 33 is determined based on the difference between the current opening and the target opening of the guide vane and the difference between the travel speed (i.e., the adjustment speed) of the linear motion body 33, and the direction of linear motion is determined. There are two possible outcomes: one is that the stroke of the linear motion body 33 needs to be increased, meaning the linear motion body 33 moves away from the reducer 22 while simultaneously pushing the turbine's movable guide vane control ring; the other is that the stroke of the linear motion body 33 needs to be decreased, meaning the linear motion body 33 moves closer to the reducer 22 while simultaneously pulling the turbine's movable guide vane control ring.

[0100] If the stroke of the linear motion body 33 needs to be increased, the positive voltage U1 is increased in a single step;

[0101] The motor voltage needs to be increased in stages and in multiple steps until the required voltage is reached or the linear motion body 33 is determined to be in position. Each increase in positive voltage U1 can be 5V, 10V, etc. This is to prevent a direct, one-time increase to the required voltage, which could lead to motor failure.

[0102] Then it is necessary to determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage.

[0103] If the output speed of the drive mechanism is zero and the voltage exceeds the rated voltage, the drive mechanism is de-energized and the process ends.

[0104] If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, then determine whether the stroke of the linear motion body 33 has reached the limit.

[0105] Specifically, after each increase in positive voltage, it is necessary to determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage. When the motor output speed is zero, it will stop rotating. If the motor voltage exceeds the rated voltage, it is in an overvoltage working state, and the motor will burn out and cannot continue to work. At this time, the power supply mechanism 1 (power cabinet) should immediately stop supplying power, and the process ends. If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, it is necessary to check whether the stroke of the linear motion body 33 has been adjusted properly after this adjustment.

[0106] If the linear motion body 33 reaches the end of its stroke, the drive mechanism is de-energized, and the process ends.

[0107] If the linear motion body 33 does not reach its full stroke, then determine whether the output torque of the drive mechanism exceeds the rated torque.

[0108] After the determination, if the linear motion body 33 has reached its travel limit, it indicates that the adjustment is complete. The power supply mechanism 1 (power cabinet) will then stop supplying power, the motor will be de-energized and stop running, and the adjustment process will end. If the linear motion body 33 has not reached its travel limit, it is necessary to further determine whether the output torque of the drive mechanism exceeds the rated torque.

[0109] If the output torque of the drive mechanism exceeds the rated torque, an alarm will sound and the process will end.

[0110] If the output torque of the drive mechanism is less than the rated torque, then return to the step of increasing the positive voltage U1 once.

[0111] If the output torque of the drive mechanism exceeds the rated torque, the motor will jam, triggering an over-torque alarm and ending the process. If the output torque of the drive mechanism is less than the rated torque, it indicates that further adjustment is possible, and the positive voltage U1 will be increased again. This process is repeated step by step according to the above judgment procedure until the process ends.

[0112] If the stroke of the linear motion body 33 needs to be reduced, the reverse voltage U2 is increased once.

[0113] Determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage;

[0114] If the output speed of the drive mechanism is zero and the voltage exceeds the rated voltage, the motor is powered off and the process ends.

[0115] If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, then determine whether the stroke of the linear motion body 33 has reached the limit.

[0116] If the linear motion body 33 reaches the end of its stroke, the drive mechanism is de-energized, and the process ends.

[0117] If the linear motion body 33 does not reach its full stroke, then determine whether the output torque of the drive mechanism exceeds the rated torque.

[0118] If the output torque of the drive mechanism exceeds the rated torque, an alarm will sound and the process will end.

[0119] If the output torque of the drive mechanism is less than the rated torque, then return to the step of increasing the reverse voltage U2 once.

[0120] The decision process for reducing the stroke of linear motion body 33 is similar to the decision process for increasing the stroke of linear motion body 33, and will not be repeated here.

[0121] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An electric speed regulating system for hydroelectric power generation and pumped storage units, characterized in that, include: Power supply mechanism (1); The drive mechanism is electrically connected to the power supply mechanism (1); The transmission mechanism includes a rotating motion body (31), a limiting body (32), and a linear motion body (33). The driving end of the driving mechanism is connected to one end of the rotating motion body (31) to drive the rotating motion body (31) to rotate. The linear motion body (33) is slidably disposed in the limiting body (32), and one end of the linear motion body (33) is connected to the other end of the rotating motion body (31). The other end of the linear motion body (33) is connected to the turbine movable guide vane control ring. The limiting body (32) is used to restrict the rotational motion of the linear motion body (33) so that the linear motion body (33) moves linearly in the limiting body (32) along the axial direction of the rotating motion body (31) to push / pull the turbine movable guide vane control ring. The stroke detection mechanism (4) is adapted to detect the stroke of the linear motion body (33); The control mechanism (5) is connected to the power supply mechanism (1), the drive mechanism and the stroke detection mechanism (4).

2. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 1, characterized in that, The rotating motion body (31) is a worm, the linear motion body (33) is a worm sleeve, one end of the worm is connected to the driving end of the driving mechanism, and the other end is engaged with the worm sleeve. One end of the limiting body (32) is fixedly connected to the driving mechanism. The limiting body (32) has a sliding groove, and both the worm and the worm sleeve are located in the sliding groove.

3. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 2, characterized in that, The inner wall of the slide groove and the outer wall of the worm gear sleeve are both square.

4. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 2, characterized in that, The other end of the worm gear sleeve is provided with a pin hole, and the control ring of the turbine movable guide vane is connected to the pin hole.

5. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 1, characterized in that, The drive mechanism includes a drive motor (21) and a reducer (22). The reducer (22) is installed on the wall of the turbine room. The drive motor (21) is installed on the reducer (22). The power input end of the reducer (22) is connected to the drive end of the drive motor (21), and its power output end is connected to one end of the rotating body (31).

6. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 5, characterized in that, The reducer (22) is a planetary gear reducer or a harmonic gear reducer.

7. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 5, characterized in that, The control mechanism (5) is a speed control cabinet, which is adapted to generate control commands based on the guide vane adjustment commands output by the host computer and output them to the power supply mechanism (1).

8. The electric speed regulating system for hydroelectric power generation and pumped storage units according to claim 7, characterized in that, The power supply mechanism (1) is a power cabinet, which is connected to the drive motor (21) and the speed control cabinet. The power cabinet is adapted to adjust the parameters output to the drive motor (21) according to the control command.

9. A speed control method for a hydroelectric power generation and pumped storage unit, applied to the electric speed control system of the hydroelectric power generation and pumped storage unit as described in any one of claims 1-8, characterized in that, include: Input the target parameters into the control mechanism (5); Calculate whether the stroke of the linear motion body (33) needs to be increased or decreased based on the target parameters; If the stroke of the linear motion body (33) needs to be increased, the positive voltage U1 is increased in a single step; Determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage; If the output speed of the drive mechanism is zero and the voltage exceeds the rated voltage, the drive mechanism is de-energized and the process ends. If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, then it is determined whether the stroke of the linear motion body (33) is complete. If the linear motion body (33) reaches the end of its stroke, the drive mechanism is de-energized and the process ends; If the linear motion body (33) has not reached its travel position, then determine whether the output torque of the drive mechanism exceeds the rated torque; If the output torque of the drive mechanism exceeds the rated torque, an alarm will sound and the process will end. If the output torque of the drive mechanism is less than the rated torque, then return to the step of increasing the positive voltage U1 once. If the stroke of the linear motion body (33) needs to be reduced, the reverse voltage U2 is increased once; Determine whether the output speed of the drive mechanism is zero and whether the voltage exceeds the rated voltage; If the output speed of the drive mechanism is zero and the voltage exceeds the rated voltage, the drive mechanism is de-energized and the process ends. If the output speed of the drive mechanism is not zero and the voltage does not exceed the rated voltage, then it is determined whether the stroke of the linear motion body (33) is complete. If the linear motion body (33) reaches the end of its stroke, the drive mechanism is de-energized and the process ends; If the linear motion body (33) has not reached its travel position, then determine whether the output torque of the drive mechanism exceeds the rated torque; If the output torque of the drive mechanism exceeds the rated torque, an alarm will sound and the process will end. If the output torque of the drive mechanism is less than the rated torque, then return to the step of increasing the reverse voltage U2 once.

10. The speed control method for hydroelectric power generation and pumped storage units according to claim 9, characterized in that, In the step of inputting target parameters to the control mechanism (5), the target parameters include: the target opening of the guide vane and the travel speed.

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