Method for recovering and utilizing pressure tank pressure relief energy of a hydroelectric power station speed regulation system

Abstract

A method for recovering and utilizing pressure relief energy of a pressure tank of a hydroelectric station speed regulation system, comprising an energy recovery and utilization system, the system comprising: a loose joint interface installed on a pressure relief pipeline of the pressure tank, the loose joint interface being connected with an impeller air inlet pipeline, the impeller air inlet pipeline being connected with an impeller, the impeller being connected with a motor, the motor being connected with a rectifier inverter, the rectifier inverter being connected with a storage battery, and the impeller, the motor, the rectifier inverter and the storage battery all being connected with a PLC controller. The method for recovering and utilizing pressure relief energy of a pressure tank of a hydroelectric station speed regulation system realizes recovery and reuse of pressure relief energy of a pressure tank of a hydroelectric station speed regulation system, improves energy utilization efficiency, greatly improves pressure relief efficiency, and saves time.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system pressure control technology for generator speed governors, specifically to a method for recovering and utilizing energy from depressurization of a pressure tank in a hydropower station speed governor system. Background Technology

[0002] The hydraulic system of a large hydro-generator governor typically includes an oil tank (1) and an air tank (2), connected by a connecting pipe (3) to store sufficient hydraulic energy to ensure the turbine guide vanes can complete two full-close and full-open strokes even when the oil pump is not running, while also ensuring stable hydraulic system pressure. The rated pressure of the governor's hydraulic system is generally several MPa to tens of MPa, with an oil-to-air ratio of approximately 1:2. The compressed air inside the tanks possesses significant energy. Before governor maintenance, the hydraulic system pressure tanks need to be depressurized, releasing the compressed air directly into the atmosphere. However, this depressurization method has the following problems:

[0003] 1) It causes a huge waste of energy;

[0004] 2) Due to the high pressure in the governor's pressure tank, traditional depressurization methods require keeping the depressurization valve 4 at a relatively small opening to avoid excessive noise that could harm personnel. Furthermore, an excessively large opening can cause a rapid drop in pipe surface temperature, even leading to icing and negatively impacting the lifespan of the pipe materials. This results in prolonged depressurization time, affecting maintenance schedules. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a method for recovering and utilizing the depressurization energy of the pressure tank in the speed regulation system of a hydropower station, thereby realizing the recovery and reuse of the depressurization energy of the pressure tank in the speed regulation system of a hydropower station and improving energy utilization efficiency; at the same time, it greatly improves the depressurization efficiency and saves time.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for recovering energy from depressurization of a pressure tank in a hydropower station speed regulation system includes the following steps:

[0008] Step 1: Set the conditions for automatic motor activation when the speed controller is depressurized in the PLC controller:

[0009] ①: The governor oil tank pressure is greater than a specific value; ②: The battery charge is less than a specific value;

[0010] Step 2: After receiving the start command from the PLC controller, the motor control system determines whether the automatic start conditions for the motor are met. If yes, proceed to Step 3; otherwise, do not execute the start command.

[0011] Step 3: Determine if the motor is faulty. If so, do not execute the activation command; otherwise, proceed to Step 4.

[0012] Step four: determine if the rectifier inverter is faulty, if yes, do not execute the input command; if no, go to step five.

[0013] Step five: determine if the battery is faulty, if yes, do not execute the input command; if no, go to step six;

[0014] Step six: the PLC controller opens the electric valve opening command, and goes to step seven;

[0015] Step seven: the PLC controller opens the rectifier command, and goes to step eight;

[0016] Step eight: compressed air provides power for the impeller, the impeller drives the motor to rotate and generate electricity, at the same time, the PLC controller sends a command to the rectifier inverter to store the electric energy generated by the motor rotation in the battery, and goes to step nine;

[0017] Step nine: determine if the tank pressure is less than a certain pressure, if yes, go to step ten, if no, go to step eight.

[0018] Step ten: the PLC controller opens the electric valve closing command, and goes to step eleven;

[0019] Step eleven: the PLC controller sends a termination command to the rectifier inverter.

[0020] A method for recovering energy and recycling of a pressure tank of a hydroelectric station speed regulation system, comprising the following steps:

[0021] Step 1: set the motor automatic input conditions in the PLC controller when the speed regulator is boosting:

[0022] a: the battery capacity is greater than a certain value; b: the speed regulator oil tank pressure is less than a certain value;

[0023] Step 2: after the motor control system receives the input order opened by the unit LCU, determine if the motor automatic input conditions are met, if yes, go to step 3, if no, do not execute the input command;

[0024] Step 3: determine if the motor is faulty, if yes, do not execute the input command; if no, go to step 4;

[0025] Step 4: determine if the rectifier inverter is faulty, if yes, do not execute the input command; if no, go to step 5;

[0026] Step 5: determine if the battery is faulty, if yes, do not execute the input command; if no, go to step 6;

[0027] Step 6: the PLC controller opens the electric valve opening command, and goes to step seven;

[0028] Step 7: The PLC controller issues an inverter command, proceeding to step 8;

[0029] Step 8: The PLC controller sends a command to the rectifier inverter, the battery releases the stored electrical energy to drive the motor to rotate, the motor drives the impeller to rotate, and replenishes the air tank of the speed controller, then proceeds to step 9.

[0030] Step 9: Determine if the battery charge is less than a specific value. If yes, proceed to step 10; otherwise, proceed to step 8.

[0031] Step 10: The PLC controller sends a close command to the electric valve, proceeding to step 11;

[0032] Step 11: The PLC controller sends a termination command to the rectifier-inverter.

[0033] This invention discloses a method for recovering and utilizing energy from depressurization of a pressure tank in a hydropower station speed regulation system. The technical advantages are as follows:

[0034] 1) This invention realizes the recovery of depressurization energy from the pressure tank of the hydropower station speed regulation system. During the pressurization process of the speed regulator, the recovered energy is released to drive the impeller and replenish the pressure tank with air. The insufficient part is supplemented by the medium-pressure air system of the power station, which reduces the amount of medium-pressure air used when the speed regulator pressure tank is pressurized, saves electricity, and improves energy utilization efficiency.

[0035] 2) In the process of depressurization, the process of compressed air driving the impeller is itself a depressurization process. During depressurization, the valve can be controlled at a large opening, which greatly improves the depressurization efficiency and saves time. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0037] Figure 1 This is a structural diagram of the pressure tank depressurization energy recovery and utilization system of the hydropower station speed regulation system of the present invention.

[0038] Figure 2 This is a flowchart of the energy recovery method for depressurization of the pressure tank in the hydropower station speed regulation system according to the present invention.

[0039] Figure 3 This is a flowchart of the method for depressurizing and recovering energy from the pressure tank of the hydropower station speed regulation system according to the present invention. Detailed Implementation

[0040] like Figure 1 As shown, a system for recovering and utilizing energy from depressurization of a pressure tank in a hydropower station speed regulation system includes:

[0041] The live joint 6 installed in the pressure relief pipeline 5 of the pressure tank is connected with the impeller air inlet pipeline 7, the impeller air inlet pipeline 7 is connected with the impeller 8, the impeller 8 is connected with the motor 9, the motor 9 is connected with the rectifier inverter 10, and the rectifier inverter 10 is connected with the storage battery 11. Compressed air drives the impeller 8 to rotate, the impeller 8 drives the motor 9 to generate electricity, and the generated electricity is stored in the storage battery 11 after being rectified and filtered by the rectifier inverter 10, so that the energy of compressed air in the pressure tank is recycled.

[0042] The function of the live joint 6 is that the pressure relief pipeline 5 of the governor pressure tank is connected with the impeller air inlet pipeline 7, and the connection and disconnection are facilitated.

[0043] The function of the impeller 8 is that when the pressure tank is relieved, the impeller 8 serves as a prime mover of the motor and converts the compressed air energy into kinetic energy to drive the motor 9 to generate electricity.

[0044] The function of the motor 9 is that during the pressure relief process of the governor, the motor 9 is used as a generator, and during the pressure increasing process of the governor, the motor 9 is used as a motor set to drive the impeller 8 to rotate.

[0045] The function of the rectifier inverter 10 is that during the pressure relief process of the governor, the rectifier inverter 10 plays a role of rectification and filtering, and during the pressure increasing process of the governor, the rectifier inverter 10 plays a role of inversion.

[0046] The impeller 8, the motor 9, the rectifier inverter 10 and the storage battery 11 are all connected with the PLC controller 12.

[0047] The motor 9 is connected with the PLC controller 12 through the local control unit MCU 13.

[0048] The local control unit MCU 13 is used for controlling the control mode of the motor 9, realizing the communication between the motor 9 and the PLC controller 12, and receiving the control command of the PLC controller 12.

[0049] The rectifier inverter 10 is connected with the PLC controller 12 through the rectifier / inverter control system TCU 14.

[0050] The function of the rectifier / inverter control system TCU 14 is mainly to store the electric energy generated by the rotation of the motor 9 in the storage battery 11 during the pressure relief process of the governor, and to release the stored energy in the storage battery 11 to push the impeller 8 to supplement the air to the oil tank 1 during the pressure increasing process of the governor.

[0051] The storage battery 11 is connected with the PLC controller 12 through the battery management system BMS 15.

[0052] The function of the battery management system BMS 15 is mainly to realize the communication between the storage battery 11 and the PLC controller 12, and to monitor the key parameters such as voltage, current and temperature of the storage battery 11.

[0053] The oil tank 1 in the pressure tank is connected with a pressure transmitter 16, and the pressure transmitter 16 is connected with the PLC controller 12; the pressure transmitter 16 is used for monitoring the pressure of the oil tank 1 and sending the pressure signal to the PLC controller 12.

[0054] The impeller air inlet pipeline 5 is provided with an electric valve 17, and the electric valve 17 is connected with the PLC controller 12.

[0055] The electric valve 17 is used for outputting a control command by the PLC controller 12, adjusting the valve opening degree of the electric valve 17, and controlling the air inlet and outlet amount of the impeller 8.

[0056] The electric machine 9 adopts a small-sized permanent magnet generator.

[0057] The pressure relief pipeline 5 is provided with a valve 4.

[0058] The pressure tank comprises the oil tank 1 and the gas tank 2, and the oil tank 1 is communicated with the gas tank 2 through the communication pipe 3.

[0059] When the governor is overhauled and the pressure is increased, the electric machine 9 is supplied with the electric energy stored in the storage battery 11, the electric machine 9 drives the impeller 8 to supply the pressure tank with reverse air, the energy recovery is realized, and the insufficient part is supplemented by the plant medium-pressure air system. The generator adopts a small-sized permanent magnet generator, and can also be used for the motor working condition; the impeller 8 adopts a small-sized mixed flow impeller machine. The turbine-generator set can be mobile, and is flexibly placed at the corresponding position of the overhauled unit, that is, only one set of impeller generator set is needed in the whole plant, and the energy recovery of the governor hydraulic system during the overhauling of all units can be realized.

[0060] Figure 2 The application provides a pressure tank pressure relief energy recovery process flow chart of a governor system of a hydropower station. The application provides a pressure tank pressure relief energy recovery and reutilization method of a governor system of a hydropower station.

[0061] Step one: when the PLC controller 12 sets the governor pressure relief, the electric machine 9 is automatically put into the condition:

[0062] ①: the pressure of the governor oil tank 1 is greater than a specific value, for example, 2 MPa; ②: the electric quantity of the storage battery 11 is less than a specific value.

[0063] Step two: after the electric machine 9 control system receives the put-in order of the PLC controller 12, it is judged whether the automatic put-in condition of the electric machine 9 is met, if yes, step three is entered; if no, the put-in order is not executed.

[0064] Step three: it is judged whether the electric machine 9 has a fault, if yes, the put-in order is not executed; if no, step four is entered.

[0065] Step four: it is judged whether the rectifier-inverter 10 has a fault, if yes, the put-in order is not executed; if no, step five is entered.

[0066] Step five: determine whether the battery 11 is faulty, if yes, do not execute the input command; if no, go to step six;

[0067] Step six: the PLC controller 12 opens the opening electric valve command, and goes to step seven;

[0068] Step seven: the PLC controller (12) opens the rectification command, and goes to step eight;

[0069] Step eight: compressed air provides power for the impeller 8, and the impeller 8 drives the motor 9 to rotate and generate electricity, at the same time, the PLC controller 12 sends a command to the rectifier inverter 10 to store the power generated by the motor 9 in the battery 11, and goes to step nine;

[0070] Step nine: determine whether the tank 1 pressure is less than a certain pressure, such as 2MPa, if yes, go to step ten, if no,

[0071] Go to step eight.

[0072] Step ten: the PLC controller 12 opens the electric valve 17 closing command, and goes to step eleven;

[0073] Step eleven: the PLC controller 12 sends a termination command to the rectifier inverter 10.

[0074] Figure 3 The water power station speed regulation system pressure tank decompression energy recycling process flow chart provided by the application. The water power station speed regulation system pressure tank decompression energy recycling method comprises the following steps:

[0075] Step 1: set the motor 9 automatic input condition in the PLC controller 12 when setting the speed regulator booster:

[0076] a: the battery capacity is greater than a certain value; b: the speed regulator tank 1 pressure is less than a certain value, such as 5MPa;

[0077] Step 2: after the motor 9 control system receives the input order opened by the unit LCU, determine whether the motor 9 automatic input condition is met, if yes, go to step 3, if no, do not execute the input command;

[0078] Step 3: determine whether the motor 9 is faulty, if yes, do not execute the input command; if no, go to step 4;

[0079] Step 4: determine whether the rectifier inverter 10 is faulty, if yes, do not execute the input command; if no, go to step 5;

[0080] Step 5: determine whether the battery 11 is faulty, if yes, do not execute the input command; if no, go to step 6;

[0081] Step 6: PLC controller 12 sends open command to electric valve 17, go to Step 7;

[0082] Step 7: PLC controller 12 sends inverter command, go to Step 8;

[0083] Step 8: PLC controller 12 sends command to rectifier inverter 10, battery 11 releases stored power to drive motor 9 to rotate, motor 9 drives impeller 8 to rotate, to supplement air to speed governor air tank 2, go to Step 9;

[0084] Step 9: determine whether the battery 11 is less than a certain value, if yes, go to Step 10; if not, go to Step 8;

[0085] Step 10: PLC controller 12 sends close command to electric valve 17, go to Step 11;

[0086] Step 11: PLC controller 12 sends termination command to rectifier inverter 10.

Claims

1. A method for recovering and recycling the energy of pressure tank decompression in a hydroelectric station speed regulation system, characterized in that: the pressure tank decompression energy recovery method comprises the following steps: Step 1: Set the motor (9) automatic input condition when the speed regulator decompression in the PLC controller (12): ①: The pressure of the speed regulator oil tank (1) is greater than a certain value; ②: The battery (11) power is less than a certain value; Step 2: After the motor (9) control system receives the input order from the PLC controller (12), it is judged whether the motor (9) automatic input condition is met, if yes, go to step 3; if not, do not execute the input instruction; Step 3: It is judged whether the motor (9) has a fault, if yes, do not execute the input instruction; if not, go to step 4; Step 4: It is judged whether the rectifier inverter (10) has a fault, if yes, do not execute the input instruction; if not, go to step 5; Step 5: It is judged whether the battery (11) has a fault, if yes, do not execute the input instruction; if not, go to step 6; Step 6: The PLC controller (12) opens the electric valve opening instruction, and goes to step 7; Step 7: The PLC controller (12) opens the rectification instruction, and goes to step 8; Step 8: The compressed air provides power for the impeller (8), the impeller (8) drives the motor (9) to rotate and generate electricity, at the same time the PLC controller (12) sends an instruction to the rectifier inverter (10), the electric energy generated by the motor (9) rotation is stored in the battery (11), and goes to step 9; Step 9: It is judged whether the oil tank (1) pressure is less than a certain pressure, if yes, go to step 10, if not, go to step 8; Step 10: The PLC controller (12) opens the electric valve (17) closing instruction, and goes to step 11; Step 11: The PLC controller (12) sends a termination instruction to the rectifier inverter (10); The energy recycling method based on the above pressure tank decompression energy recovery method comprises the following steps: Step 1: Set the motor (9) automatic input condition when the speed regulator decompression in the PLC controller (12): a: The battery power is greater than a certain value; b: The pressure of the speed regulator oil tank (1) is less than a certain value; Step 2: After the motor (9) control system receives the input order from the unit LCU, it is judged whether the motor (9) automatic input condition is met, if yes, go to step 3, if not, do not execute the input instruction; Step 3: It is judged whether the motor (9) has a fault, if yes, do not execute the input instruction; if not, go to step 4; Step 4: It is judged whether the rectifier inverter (10) has a fault, if yes, do not execute the input instruction; if not, go to step 5; Step 5: It is judged whether the battery (11) has a fault, if yes, do not execute the input instruction; if not, go to step 6; Step 6: The PLC controller (12) opens the electric valve (17) opening instruction, and goes to step 7; Step 7: The PLC controller (12) opens the rectification instruction, and goes to step 8; Step 8: The PLC controller (12) sends a command to the rectifier inverter (10), the battery (11) releases stored electrical energy to drive the motor (9) to rotate, the motor (9) drives the impeller (8) to rotate, and the air is supplied to the speed regulator gas tank (2), and step 9 is entered; Step 9: Determine whether the battery (11) is less than a certain value, if yes, enter step 10; if not, enter step 8; Step 10: The PLC controller (12) sends a closing command to the electric valve (17), and enters step 11; Step 11: The PLC controller (12) sends a termination command to the rectifier inverter (10).

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