CN115622070A - Control device and control method for runner idling in phase modulation working condition of pumped storage unit - Google Patents

Abstract

The invention discloses a control device and a control method for runner idling in the phase modulation working condition of a pumped storage unit, comprising a runner chamber, the water inlet of the runner chamber is connected with the water inlet valve and the guide vane, the water outlet of the runner chamber is connected with the tail The water pipe is connected, and the lower part of the runner chamber is provided with a plurality of drain outlets, and the plurality of drain outlets are connected with the drain valve and the water pump, and also include a quick opening and closing gate installed on the draft tube, the first monitoring structure, the second monitoring structure, water level detection structure and pressure detection structure; the fast opening and closing gate includes a gate installed on the draft tube and a gate control structure, and the gate control structure is used to control the working state and opening and closing state of the gate according to the instructions issued by the first monitoring structure, and The gate status information is fed back to the first monitoring structure and the second monitoring structure. The invention does not need to use a compressed gas system to start pumping phase modulation or power generation phase modulation, eliminates the safety hazard of high-pressure gas in the plant, reduces the maintenance pressure of the unit, and improves economic benefits at the same time.

Description

Control device and control method for runner idling in phase modulation working condition of pumped storage unit

technical field

The invention relates to the technical field of electric power systems, in particular to a control device and a control method for idling runners of a pumped storage unit in phase-modulation working condition.

Background technique

When the reactive power of the power system is insufficient or excessive, it will cause the grid voltage to drop or rise, which will affect the quality of power supply and endanger the safe operation of the system. The pumped storage unit can operate as a condenser, supply or absorb reactive power according to the needs of the grid, and maintain the stability of the grid voltage. When the pumped storage unit operates (power generation or water pumping) with phase modulation, the existing technology uses high-pressure gas to enter the runner chamber for phase modulation and water pressure to keep the runner idling, and a complete set of high-pressure gas system is required. When the phasing condition is started, the high-pressure air in the phasing pressurized water-air tank enters the runner chamber through the opened main pressure valve and air supply valve. Since the water inlet valve and guide vane on the upstream side of the runner are fully closed, the high-pressure air will The water in the runner chamber is pressed downwards. After the water pressure in the runner chamber reaches a low water level (water level signal detection), the main pressure valve and the air supply valve are closed to keep the runner rotating in an anhydrous environment and reduce active power loss.

The compressed air system consists of multiple air compressors and their auxiliary equipment, gas storage tanks, piping systems, and measurement and control components; 1 operating gas tank (specially used for unit governor and ball valve pressure oil tank), 1 phase-modulating pressurized water balance gas tank, 4 unit phase-modified pressurized water tanks and corresponding pipelines, valves, etc.; system There are a lot of equipment, and multiple medium compressors, gas storage tanks and high-pressure gas pipelines occupy a large workshop space, and 7Mpa high-pressure gas has great safety hazards; 7Mpa medium compressors and measurement and control components often fail.

In addition, introducing high-pressure gas into the runner chamber requires a complete set of phase-adjusting water pressure system. The phase-modulated water pressure system consists of a phase-modulated water pressure tank, a main pressure water valve, an air supply valve, a water ring drain valve, a volute exhaust valve, an exhaust valve, a phase-modulated water pressure control system, etc. The number of control components is large, and failures occur frequently.

At the end of the phase modulation start-up process of the unit, it is necessary to monitor whether the tail water level feedback signal is normal and whether the water level is within the normal range. When the phasing condition runs for a long time, the water level will gradually rise and exceed the low water level, and it is necessary to re-open the air supply valve for air supply. If the grid dispatching order urgently needs to transfer the unit to the pumping mode at this time, it will cause a certain delay and affect the stability of the grid voltage and frequency.

Contents of the invention

The technical problem to be solved by the present invention is to provide a control device and a control method for the idling of the runner in the phase modulation condition of the pumped storage unit in view of the above-mentioned deficiencies in the prior art, which solves the problem of the existing pumping phase modulation or power generation phase modulation working conditions The adjustment process at start-up is cumbersome and there is a problem of delay.

In order to achieve the above object, the present invention adopts the following technical solutions to achieve:

A control device for runner idling in phase modulation working condition of a pumped storage unit, comprising a runner chamber, the water inlet of the runner chamber is connected with a water inlet valve and a guide vane, and the water outlet of the runner chamber is connected with a draft pipe, The lower part of the runner chamber is provided with a plurality of drains, and the plurality of drains are connected with the drain valve and the water pump, and also include a quick opening and closing gate installed on the draft tube, a first monitoring structure, and a second monitoring structure , water level detection structure and pressure detection structure;

The fast opening and closing gate includes a gate installed on the draft tube and a gate control structure, and the gate control structure is used to control the working state and opening and closing state of the gate according to the instructions issued by the first monitoring structure, and feed back the gate state information to a first monitoring structure and a second monitoring structure;

The first monitoring structure is used to receive water level information, gate working status information, guide vane switch information, water inlet valve switch information, and draft pipe internal pressure information, and issue corresponding opening and closing instructions to the gate control structure according to the received information ;

The second monitoring structure is used to receive gate opening and closing information, and issue corresponding opening and closing instructions to the drain valve and water pump according to the received information;

The water level detection structure is used to detect water level information and transmit it to the first monitoring structure;

The pressure detection structure is used to detect the pressure information in the draft tube.

Optionally, the water level detection structure includes two water level sensors respectively arranged on the low water level and the high water level in the runner chamber; when the measured water level is lower than the low water level, the fast opening and closing gate enters the closed state, and the runner The water inlet of the chamber is closed; when the measured water level is higher than the high water level, the quick opening and closing gate enters the open state, and the water inlet of the runner chamber is closed.

Optionally, the fast opening and closing gate also includes a gate state monitoring device, the gate state monitoring device includes a position sensor and a video acquisition structure, and the position sensor is used to acquire gate position information and transmit it to the first monitoring structure and the second monitoring structure. Two monitoring structures, the video acquisition structure is used to collect gate operation image information and transmit it to the first monitoring structure and the second monitoring structure.

Optionally, an air intake hole is opened above the runner chamber, and the air intake hole is a one-way air intake structure.

Optionally, an exhaust pipeline is opened above the runner chamber, and an exhaust valve is arranged on the exhaust pipeline, and a gas-water separation device is arranged in the exhaust valve.

Optionally, the fast opening and closing gate is located below the low water level.

Optionally, it also includes a water collection well connected to a plurality of the drainage outlets.

A control method for runner idling in phase-modulation working condition of a pumped-storage unit, using the control device for runner idling in phase-modulating working condition of a pumped-storage unit described in any one, comprising the following steps:

It is judged respectively that the pumped storage unit is operating in the pumping phase adjustment condition or the pumping condition;

Judging that the pumped storage unit is operating under the condition of pumping and phase modulation, checking that the inlet valve and guide vane are closed and the pressure in the draft pipe is normal, and closing the quick opening and closing gate;

Check that the water inlet valve, guide vane and quick opening and closing gate are all closed, open the drain valve, and start the water pump to drain water;

The water level sensor measures that the water level is lower than the low water level line, stops the water pump to drain water, and closes the drain valve;

Judging that the pumped storage unit is operating in the pumping condition, open the exhaust valve and drain valve, and start the water pump to fill water;

The water level sensor measures that the water level is higher than the high water level line, stops the water pump to fill water, closes the drain valve, and opens the fast opening and closing gate.

Optionally, the step of judging that the pumped storage unit is operating in the pumping phase modulation condition, detecting that the water inlet valve, the guide vane is closed and the pressure in the draft pipe is normal, and closing the fast opening and closing gate includes:

After the first monitoring structure receives the closing information of the water inlet valve, the closing information of the guide vane and the normal information of the pressure in the draft pipe, it issues an instruction to the gate control structure to close the drain valve.

Optionally, the steps of judging that the pumped storage unit is operating in the pumping condition, opening the exhaust valve and the drain valve, and starting the pump to fill water include:

The second monitoring structure receives the closing information of the water inlet valve, the closing information of the guide vane and the closing information of the fast opening and closing gate, issues corresponding opening instructions to the drain valve and the water pump, opens the drain valve, and starts the water pump to drain water.

The beneficial effect of the present invention is that: the present invention replaces the compressed air system in the prior art with fast opening and closing gates and drain valves, which saves a lot of workshop space and reduces the potential safety hazards of high-pressure air pipes and multiple large-scale high-pressure gas tanks in the workshop , so that the switching of unit operating conditions is more stable (the water level will not rise with time delay), the switching is faster, and the work efficiency is improved. At the same time, automatic control is realized through the cooperation of the first monitoring structure and the second monitoring structure, which is more convenient.

Description of drawings

Fig. 1 is the structure schematic diagram of the control device of the idling runner of the pumped-storage unit phase modulation working condition of the present invention;

Fig. 2 is the structural representation of runner chamber in the present invention;

Fig. 3 is the structural representation of fast opening and closing gate in the present invention;

Fig. 4 is the flow chart of the control method of the pumped-storage unit of the present invention in the mode of pumping and phase modulation;

Fig. 5 is a flow chart of the control method of the pumped-storage unit in the pumping condition of the present invention.

In the figure, 1-runner chamber, 100-guide vane, 200-inlet valve, 300-draft pipe, 400-quick opening and closing gate, 410-gate, 420-gate control structure, 430-gate status monitoring device, 431 -position sensor, 432-video acquisition structure, 500-drainage valve, 600-water pump, 700-air intake hole, 800-exhaust pipe, 900-exhaust valve, 910-gas-water separation device;

2-first monitoring structure, 3-second monitoring structure, 4-water level detection structure, 5-pressure detection structure, 6-water level sensor, 7-water collection well.

detailed description

Describe the specific embodiment of the present invention below in conjunction with accompanying drawing and embodiment:

Example 1

As shown in Figures 1-3, which shows a specific embodiment of the present invention, a control device for runner idling in the phase modulation condition of a pumped storage unit, including a runner chamber 1, the runner chamber 1 The water inlet of the runner chamber 1 is connected with the guide vane 100 and the water inlet valve 200, and the water outlet of the runner chamber 1 is connected with the draft tube 300. The bottom of the runner chamber 1 is provided with a plurality of drain outlets, and the plurality of drain outlets are all connected to The drain valve 500 is connected to the water pump 600, and also includes a fast opening and closing gate 400 installed on the draft pipe 300, a first monitoring structure 2, a second monitoring structure 3, a water level detection structure 4 and a pressure detection structure 5;

The fast opening and closing gate 400 includes a gate 410 installed on the draft tube 300 and a gate control structure 420, the gate control structure 420 is used to control the working state and opening and closing state of the gate 410 according to the instructions issued by the first monitoring structure 2, And feedback the state information of the gate 410 to the first monitoring structure 2 and the second monitoring structure 3;

The first monitoring structure 2 is used to receive the water level information, the working state information of the gate 410, the switch information of the guide vane 100, the switch information of the water inlet valve 200, and the pressure information in the draft tube 300, and report to the gate control structure 420 according to the received information. Issue corresponding opening and closing instructions;

The second monitoring structure 3 is used to receive opening and closing information of the gate 410, and issue corresponding opening and closing instructions to the drain valve 500 and the water pump 600 according to the received information;

The water level detection structure 4 is used to detect the water level information and transmit it to the first monitoring structure 2;

The pressure detection structure 5 is used to detect the pressure information in the draft tube 300 .

Optionally, the water level detection structure 4 includes two water level sensors 6 respectively arranged on the low water level and the high water level in the runner chamber 1; when the measured water level is lower than the low water level, the quick opening and closing gate 400 enters In the closed state, the water inlet of the runner chamber 1 is closed; when the measured water level is higher than the high water level, the quick opening and closing gate 400 enters the open state, and the water inlet of the runner chamber 1 is closed.

Optionally, the fast opening and closing gate 400 also includes a gate state monitoring device 430, and the gate state monitoring device 430 includes a position sensor 431 and a video acquisition structure 432, and the position sensor 431 is used to acquire the position information of the gate 410 and transmit For the first monitoring structure 2 and the second monitoring structure 3 , the video acquisition structure 432 is used to collect the operation image information of the gate 410 and transmit it to the first monitoring structure 2 and the second monitoring structure 3 .

Optionally, an air intake hole 700 is opened above the runner chamber 1, and the air intake hole 700 is a one-way air intake structure.

In this embodiment, the air intake hole 700 of the runner chamber 1 is set as required to maintain the positive pressure of the runner chamber 1. The air inlet hole 700 should be located above the runner chamber 1, and the air inlet hole 700 only takes in air in one direction.

Optionally, an exhaust pipeline 800 is opened above the runner chamber 1, and an exhaust valve 900 is arranged on the exhaust pipeline 800, and a gas-water separation device 910 is arranged in the exhaust valve 900.

In this embodiment, an exhaust valve 900 and an exhaust pipe 800 are arranged above the runner chamber 1 as required, and the exhaust valve 900 has a gas-water separation device 910 for only exhausting but not draining.

Optionally, the quick opening and closing gate 400 is located below the low water level.

Optionally, it also includes a water collection well 7 connected to a plurality of the water outlets, and the water collection well 7 is used to collect water from the runner chamber 1 .

In this embodiment, a set of fast opening and closing gates 400 (ball valves or butterfly valves are configured according to requirements) is installed in the draft pipe 300 downstream of the runner chamber 1, and the fast opening and closing gates 400 must be below the low water level line, and fast opening and closing are required. The gate 400 has no or negligible influence on the water flow in the pipeline;

A plurality of drainage outlets are set at the lower water level of the runner chamber 1 where the runner idling condition is satisfied, and each drainage outlet is provided with a drainage valve 500 and a water pump 600 that can be reversed, and the drainage valve 500 can be an electric valve.

Example 2

On the basis of Embodiment 1, as shown in Figure 4-5, a control method for the idling of the runner of the pumped storage unit in the phase modulation condition, using any one of the pumped storage units in the phase modulation condition of the runner A control device for idling, comprising the following steps:

It is judged respectively that the pumped storage unit is operating in the pumping phase adjustment condition or the pumping condition;

As shown in Fig. 4, it is judged that the pumped storage unit is operating under the pumping phase modulation condition, the water inlet valve 200, the guide vane 100 are closed and the pressure in the draft pipe 300 is normal, and the quick opening and closing gate 400 is closed;

Detect that the water inlet valve 200, the guide vane 100 and the quick opening and closing gate 400 are all closed, open the drain valve 500, and start the water pump 600 to drain water;

The water level sensor 6 measures that the water level is lower than the low water level line, stops the water pump 600 to drain water, and closes the drain valve 500;

Optionally, the steps of judging that the pumped storage unit is operating under the pumping phase modulation condition, detecting that the inlet valve 200, the guide vane 100 is closed and the pressure in the draft tube 300 is normal, and closing the fast opening and closing gate 400 include:

The first monitoring structure 2 issues an instruction to the gate control structure 420 to close the drain valve 500 after receiving the closing information of the inlet valve 200 , the closing information of the guide vane 100 and the normal pressure information in the draft tube 300 .

In this embodiment, the fast opening and closing gate 400 is in the fully open position under normal conditions, and only during the start-up process of phase modulation and water pressure, the water inlet valve 200 is fully closed, the guide vane 100 is fully closed, and the pressure of the draft pipe 300 is detected during the start-up process. After the normal conditions are met, close the fast opening and closing gate 400, so that the upstream and downstream water of the runner chamber 1 is cut off; during the start-up process, it is detected that the water inlet valve 200 is fully closed, the guide vane 100 is fully closed, and the fast opening and closing gate 400 is fully closed Finally, open the electric valves of a plurality of drain outlets at the low position of the water level, start the water pump 600 to quickly drain the accumulated water in the runner chamber 1, and satisfy the idling of the runner.

As shown in Figure 5, it is judged that the pumped storage unit is operating in the pumping condition, the exhaust valve 900 and the drain valve 500 are opened, and the water pump 600 is started to fill with water;

The water level sensor 6 measures that the water level is higher than the high water level, stops the water pump 600 from filling water, closes the drain valve 500, and opens the fast opening and closing gate 400.

Optionally, the steps of judging that the pumped storage unit is operating in the pumping condition, opening the exhaust valve 900 and the drain valve 500, and starting the water pump 600 to fill water include:

The second monitoring structure 3 receives the closing information of the water inlet valve 200, the closing information of the guide vane 100, and the closing information of the fast opening and closing gate 400, and issues corresponding opening instructions to the drain valve 500 and the water pump 600, opens the drain valve 500, and starts the water pump 600 to drain water .

In this embodiment, when the unit is transferred from the pumping phase modulation working condition to the pumping working condition, the exhaust valve 900 is opened to discharge the gas in the runner chamber 1, the electric valve of the drain port is opened, and the water pump 600 is started at the same time to discharge the gas in the runner chamber 1. Filling with water: filling the runner chamber 1 with water is to prevent the quick opening and closing valve from being opened directly, and water splashing upwards in the runner chamber 1 will cause the runner to be damaged. When the water is filled until the high water level signal is satisfied, the water pump 600 is stopped, and the electric valve of the drain port is closed. When it is detected that the high water level signal and the closing of the electric valve of the drain port are all satisfied, the quick opening and closing valve is opened; the closing of the exhaust valve 900 is consistent with the existing sequential control process.

To sum up, the control device and control method for the runner idling of the pumped-storage unit in the phase-modulation working condition of the present invention adopts the fast opening and closing gate 400 and the drain valve 500 to replace the compressed air system, which saves a lot of workshop space and reduces the cost of the workshop. The potential safety hazards of internal high-pressure gas pipes and multiple large-scale high-pressure gas tanks make the unit's working conditions more stable (the water level will not rise with time) and faster.

The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and can also be made within the scope of knowledge of those of ordinary skill in the art without departing from the gist of the present invention. These changes involve related technologies well known to those skilled in the art, and these all fall within the protection scope of the patent of the present invention.

Many other changes and modifications can be made without departing from the spirit and scope of the present invention. It should be understood that the invention is not limited to the particular embodiments, but that the scope of the invention is defined by the appended claims.

Claims (10)

1. The utility model provides a controlling means of phase modulation operating mode runner idle running of pumped storage unit, includes the runner room, the water inlet and the water intaking valve and the stator of runner room are connected, and the delivery port and the draft tube of runner room are connected, the lower part of runner room is provided with a plurality of outlet, and is a plurality of the outlet all is connected its characterized in that with drain valve and water pump: the device also comprises a quick opening and closing gate, a first monitoring structure, a second monitoring structure, a water level detection structure and a pressure detection structure, wherein the quick opening and closing gate is arranged on the draft tube;

the rapid opening and closing gate comprises a gate and a gate control structure, wherein the gate is arranged on a draft tube, and the gate control structure is used for controlling the working state and the opening and closing state of the gate according to an instruction issued by the first monitoring structure and feeding back the state information of the gate to the first monitoring structure and the second monitoring structure;

the first monitoring structure is used for receiving water level information, gate working state information, guide vane switch information, water inlet valve switch information and pressure information in a tail water pipe, and issuing corresponding opening and closing instructions to the gate control structure according to the received information;

the second monitoring structure is used for receiving the opening and closing information of the gate and issuing corresponding opening and closing instructions to the drain valve and the water pump according to the received information;

the water level detection structure is used for detecting water level information and transmitting the water level information to the first monitoring structure;

the pressure detection structure is used for detecting pressure information in the tail water pipe.

2. The device for controlling the idle rotation of the rotating wheel of the pumped storage unit in the phase modulation condition as claimed in claim 1, wherein: the water level detection structure comprises two water level sensors which are respectively arranged on a low water level line and a high water level line in the runner chamber; when the measured water level is lower than the low water level, the gate is opened and closed quickly, and the water inlet of the runner chamber is closed; when the measured water level is higher than the high water level line, the gate is opened and closed quickly, and the water inlet of the runner chamber is closed.

3. The device for controlling the idle rotation of the rotating wheel of the pumped storage unit in the phase modulation condition as claimed in claim 1, wherein: the gate is opened and close fast still includes gate state monitoring devices, gate state monitoring devices includes position sensor and video acquisition structure, position sensor is used for acquireing gate positional information and transmits for first control structure and second control structure, the video acquisition structure is used for gathering gate operation image information and transmits for first control structure and second control structure.

4. The apparatus of claim 1, wherein the apparatus comprises: an air inlet is formed in the upper portion of the runner chamber and is of a one-way air inlet structure.

5. The device for controlling the idle rotation of the rotating wheel of the pumped storage unit in the phase modulation condition as claimed in claim 1, wherein: an exhaust pipeline is arranged above the runner chamber, an exhaust valve is arranged on the exhaust pipeline, and a gas-water separation device is arranged in the exhaust valve.

6. The device for controlling the idle rotation of the rotating wheel of the pumped storage group in the phase modulation condition as claimed in claim 2, wherein: the quick opening and closing gate is positioned below the low water level line.

7. The device for controlling the idle rotation of the rotating wheel of the pumped storage unit in the phase modulation condition as claimed in claim 1, wherein: the water collecting well is connected with the water discharging ports.

8. A method for controlling the idling of a phase modulation working condition rotating wheel of a pumped storage unit, which adopts the device for controlling the idling of the phase modulation working condition rotating wheel of the pumped storage unit according to any one of claims 1 to 7, and is characterized in that: the method comprises the following steps:

respectively judging that the pumped storage unit operates under a phase pumping condition or a water pumping change condition;

judging that the pumped storage unit operates under the phase modulation working condition of pumping, detecting that a water inlet valve and a guide vane are closed and the pressure in a tail water pipe is normal, and closing a quick opening and closing gate;

detecting that the water inlet valve, the guide vane and the quick opening and closing gate are all in a closed state, opening the drain valve, and starting the water pump to drain;

the water level sensor measures that the water level is lower than the low water level, the water pump is stopped to drain water, and the drain valve is closed;

judging that the pumped storage unit operates under a pumping working condition, opening an exhaust valve and a drain valve, and starting a water pump to fill water;

and the water level sensor measures that the water level is higher than the high water level line, stops the water filling of the water pump, closes the drain valve and opens the quick opening and closing gate.

9. The method for controlling the idling of the rotating wheel of the phase modulation condition of the pumped storage unit as claimed in claim 8, wherein: the method comprises the following steps of judging that the pumped storage unit operates under the phase modulation working condition, detecting that a water inlet valve and a guide vane are closed and the pressure in a tail water pipe is normal, and closing a quick opening and closing gate, wherein the steps comprise:

and after the first monitoring structure receives the closing information of the water inlet valve, the closing information of the guide vane and the normal information of the pressure in the tail water pipe, the first monitoring structure gives an instruction of closing the drain valve to the gate control structure.

10. The method for controlling the idle rotation of the rotating wheel of the pumped storage unit in the phase modulation condition as claimed in claim 8, wherein the method comprises the following steps: judging that the pumped storage unit operates under the pumping working condition, opening an exhaust valve and a drain valve, and starting a water pump to fill water, wherein the steps comprise:

the second monitoring structure receives closing information of the water inlet valve, closing information of the guide vane and closing information of the quick opening and closing gate, sends corresponding opening instructions to the drain valve and the water pump, opens the drain valve and starts the water pump to drain water.

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