An optimization method for the automatic startup process of a large-scale hydro turbine unit

Abstract

The present invention discloses an optimization method for the automatic startup process of a large-scale water turbine unit. The startup operation from the unit shutdown state to the unit power generation state includes switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, hydraulic system startup, high-pressure oil injection, speed governor startup and excitation injection. The startup process is in the following order: switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, hydraulic system startup, high-pressure oil injection, speed governor startup and excitation injection. The present invention adjusts the automatic startup process to prevent the pressure build-up of the cooling equipment pipeline caused by starting the technical water supply first, thereby reducing systemic risks; refines the automatic startup steps to facilitate accurate positioning when a fault occurs in the automatic startup process; and sets the startup sequence of each device to prevent the phenomenon of excessive startup current when the devices are started at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of operation of a hydro-generator set, and in particular relates to a method for optimizing an automatic startup process of a large hydro-generator set. Background Art

[0002] At present, there are two methods for starting up large-scale hydropower units above 700,000 kilowatts in China: manual start-up and automatic start-up. Under normal conditions, automatic start-up is adopted. The commonly used automatic start-up process is as follows: Figure 1 As shown, the existing boot process is as follows:

[0003] Shutdown state - switch operation - cooling equipment operation - auxiliary equipment operation - start hydraulic system - put high pressure oil - speed governor start - put excitation - power generation state. The cooling equipment operation in the start-up process of the hydro-generator set includes opening the electric valve and water filter, starting the water-guided external circulation oil pump, starting the derivation external circulation oil pump, starting the pure water system, and starting the main transformer cooler; the auxiliary equipment operation includes withdrawing the generator pit heater, putting in the upper guide oil mist absorption device, putting in the derivation oil mist absorption device, putting in the collector ring dust absorption device, putting in the collector ring fan, and withdrawing the creep detection device.

[0004] When the above process is used to automatically start the machine, the following problems often occur:

[0005] 1. In the existing startup process, the cooling equipment is operated first and then the auxiliary equipment. The cooling water pipeline is pressurized but the cooling valve is not opened, causing the pipeline to be pressurized;

[0006] 2. The operation steps of cooling equipment and auxiliary equipment in the startup process are vague. If the automatic startup process exits, the reason for the process exit cannot be accurately located;

[0007] 3. When cooling equipment and auxiliary equipment are operated, all equipment is started at the same time. There is an excessive current at the moment of starting, which may cause the switch to trip. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies in the prior art and propose a method for optimizing the automatic startup process of a large-scale water turbine unit. The method first opens the forward and reverse water supply valves to ensure that the pressure in the cooling water pipeline in the auxiliary equipment is released, and then opens the valves in the cold water system in turn and closes one of the forward and reverse water supply valves to ensure that the cooling water can enter the cooling water pipe of the auxiliary equipment to play a cooling role, thereby solving the problem of pipeline pressure buildup in the existing startup process.

[0009] The present invention provides an optimization method for the automatic startup process of a large-scale water turbine unit. The startup operation from the unit shutdown state to the unit power generation state includes switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, starting the hydraulic system, high-pressure oil injection, speed governor startup and excitation injection. The startup process is in the following order: switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, starting the hydraulic system, high-pressure oil injection, speed governor startup and excitation injection.

[0010] Preferably, the operation of the turbine auxiliary equipment includes, in order of operation, exiting the peristaltic detection device, starting the water-conducting external circulation oil pump, and starting the waterwheel chamber fan.

[0011] Preferably, the operation of the generator auxiliary equipment includes, in order of operation, exiting the generator pit heater, starting the derived external circulation oil pump, starting the upper guide oil mist absorption device, starting the derived oil mist absorption device, starting the collector ring dust absorption device, and starting the collector ring fan.

[0012] Preferably, the main transformer equipment operation includes starting a main transformer cooler.

[0013] Preferably, the technical water supply operation includes, in order of operation, simultaneously opening the technical water supply forward water supply valve and the technical water supply reverse water supply valve, opening the technical water supply main valve, opening the water filter outlet valve, opening the water filter inlet valve, opening the pressure reducing valve outlet valve, opening the pressure reducing valve inlet valve, and closing the technical water supply forward water supply valve or the reverse water supply valve.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides an optimization method for the automatic startup process of a large-scale water turbine unit, which adjusts the automatic startup process, prevents the pressure build-up in the cooling equipment pipeline caused by starting the technical water supply first, and reduces the systemic risk.

[0016] The present invention provides a method for optimizing the automatic startup process of a large-scale water turbine unit, which refines the automatic startup steps and facilitates accurate positioning when a fault occurs in the automatic startup process.

[0017] The invention provides a method for optimizing the automatic startup process of a large-scale water turbine unit, which sets the startup sequence of each device to prevent the phenomenon of excessive startup current when the devices are started at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of unit startup in the prior art.

[0019] Figure 2 This is a flow chart of the unit startup in the present invention.

[0020] Figure 3 This is a comparison diagram before and after the process optimization of the present invention.

[0021] Figure 4 This is the operating procedure of the generator auxiliary equipment in the present invention.

[0022] Figure 5 This is the operation process of the turbine auxiliary equipment in the present invention.

[0023] Figure 6 This is the operation process of the main transformer equipment in the present invention.

[0024] Figure 7 This is the water supply operation process of the technology in the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] As a preferred embodiment of the present invention, Figure 1-Figure 7 As shown, this embodiment provides an optimization method for the automatic startup process of a large-scale hydro-turbine unit. The startup operation from the unit shutdown state to the unit power generation state includes switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, starting the hydraulic system, injecting high-pressure oil, starting the speed governor and injecting excitation. The order of the startup process is: switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, starting the hydraulic system, injecting high-pressure oil, starting the speed governor and injecting excitation.

[0027] In the description of the present invention, the switch operation generally refers to making the unit equipment reach a state ready for startup.

[0028] In some specific embodiments, the turbine auxiliary equipment operates as follows: Figure 5 As shown, the operation of the turbine auxiliary equipment includes exiting the creep detection device, starting the water-guided external circulation oil pump, and starting the waterwheel chamber fan.

[0029] In some specific embodiments, the generator auxiliary device operates as follows: Figure 4 As shown, it includes exiting the generator pit heater, starting the derived external circulation oil pump, starting the upper guide oil mist absorption device, starting the derived oil mist absorption device, starting the collector ring dust absorption device, and starting the collector ring fan.

[0030] In some embodiments, the main transformer device operates as follows: Figure 6 As shown, including starting the main transformer cooler.

[0031] In some embodiments, technical water supply operation: technical water supply operation such as Figure 7 As shown, it includes opening the technical water supply forward water supply valve, opening the technical water supply reverse water supply valve, and opening the forward and reverse water supply valves at the same time. The cooling water system will be in a drainage state and will not reach the cooling water pipeline of the auxiliary equipment. Open the technical water supply main valve, open the water filter outlet valve, open the water filter inlet valve, open the pressure reducing valve outlet valve, open the pressure reducing valve inlet valve, close the technical water supply forward water supply valve or the reverse water supply valve. In the process, open the forward and reverse water supply valves first to ensure that the pressure in the cooling water pipeline in the auxiliary equipment is released, and then open each valve in the cold water system in turn and close one of the forward and reverse water supply valves to ensure that the cooling water can enter the cooling water pipe of the auxiliary equipment to play a cooling role, while avoiding system pressure buildup.

[0032] After the above optimization process, start each auxiliary equipment first to ensure that the cooling water pipeline valve of the auxiliary equipment is open, and then open the technical water supply valve to prevent pressure buildup in the cooling water pipeline.

[0033] The present invention redesigns the steps in the startup process, clarifies the device names, and facilitates fault location after the process is interrupted; at the same time, it optimizes the device startup sequence in each step to ensure that the devices are started at staggered times to avoid excessive startup current caused by simultaneous startup of the devices.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for optimizing the automatic startup process of a large-scale hydro turbine unit, wherein the startup operation from the unit shutdown state to the unit power generation state includes switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, hydraulic system startup, high-pressure oil injection, speed governor startup and excitation injection, characterized in that: The order of the startup process is: switch operation, generator auxiliary equipment operation, turbine auxiliary equipment operation, main transformer equipment operation, technical water supply equipment operation, starting the hydraulic system, injecting high-pressure oil, starting the speed governor and injecting excitation; the main transformer equipment operation includes starting the main transformer cooler; the technical water supply equipment operation includes, in order of operation, simultaneously opening the technical water supply forward water supply valve and the technical water supply reverse water supply valve, opening the technical water supply main valve, opening the water filter outlet valve, opening the water filter inlet valve, opening the pressure reducing valve outlet valve, opening the pressure reducing valve inlet valve, and closing the technical water supply forward water supply valve or the technical water supply reverse water supply valve.

2. The method for optimizing the automatic startup process of a large-scale water turbine unit according to claim 1, characterized in that: The operation of the turbine auxiliary equipment includes, in order of operation, exiting the creep detection device, starting the water-guided external circulation oil pump, and starting the waterwheel chamber fan.

3. The method for optimizing the automatic startup process of a large-scale water turbine unit according to claim 1, characterized in that: The operation of the generator auxiliary equipment includes, in order of operation, exiting the generator pit heater, starting the derived external circulation oil pump, starting the upper guide oil mist absorption device, starting the derived oil mist absorption device, starting the collector ring dust absorption device, and starting the collector ring fan.

Images