Starting control system and method for water-cooled static frequency converter of pumped storage unit

Abstract

The invention discloses a start control system and a start control method for a water-cooled static frequency converter of a pumped storage unit, which control stator current and exciting current of a synchronous motor through the static frequency converter, realize low-frequency start and stable acceleration of the motor, avoid large current impact in the start process and prolong the service life of equipment. And the water cooling system is combined with the deionized water circulating cooling device, so that stable operation of the SFC system under a high-power condition is ensured, and overheating of equipment is prevented. And meanwhile, the unit monitoring system monitors the whole starting process in real time, and the tripping protection system automatically triggers tripping when detecting abnormity, so that safe shutdown is realized. The main loop and the bypass switch ensure stable switching of the system, and the input / output oil pump further guarantees temperature control of the system, so that the equipment can still operate safely and efficiently under high load.

Description

Technical Field

[0001] The present invention belongs to the field of water-cooled static frequency converter control, and in particular, relates to a pumped storage unit water-cooled static frequency converter start-up control system and control method. Background Art

[0002] With the continuous increase in the demand for stability and flexibility of modern power systems, especially in the context of large-scale grid connection of renewable energy, the regulation capacity of the power system has become a key factor in ensuring the safety and stable operation of the power grid. As one of the most mature large-scale energy storage technologies, pumped storage power stations have gradually been widely used around the world. By pumping water to store energy when power demand is low and releasing electricity when power demand is peak, pumped storage power stations effectively realize the dispatch and conversion of electric energy, becoming an important tool for regulating grid frequency and balancing power supply and demand. At the same time, with the continuous increase in the proportion of intermittent power sources such as wind power and solar energy, pumped storage power stations, as a flexible means of regulation, have further demonstrated their core position in stabilizing grid frequency and optimizing power dispatch.

[0003] In the operation of pumped storage units, the starting and stopping of motors are important links that affect their efficient operation. Especially during the motor starting process, since synchronous motors have large rotor inertia, the initial torque and current required for starting are relatively high. If the traditional starting method is used, it is easy to cause large current shocks, causing excessive stress on key electrical equipment such as motor windings and transformers, and even causing equipment damage or shortening its service life. In addition, large current shocks may also affect the voltage stability of the system, further increasing the operation risk of the power grid.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pumped storage unit water-cooled static inverter startup control system and control method, which solves the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A water-cooled static inverter starting control system for a pumped storage unit comprises: a static inverter for controlling the stator current and excitation current of a synchronous motor, and completing low-frequency starting and acceleration of the synchronous motor by changing the magnetic field and torque inside the synchronous motor;

[0008] Water cooling system, including deionized water circulation cooling device, is used to cool the high-power commutation equipment in the main circuit of the SFC system to ensure the safe operation of the system under high current conditions;

[0009] The unit monitoring system is used to monitor and control the entire startup process, issue startup commands, monitor the operating status of cooling water and oil pumps, ensure the normal operation of each subsystem, and trigger the trip logic in case of abnormalities;

[0010] Input / output oil pump, used to provide cooling oil for the commutation equipment in the main circuit of the SFC system to ensure the temperature control of the system;

[0011] The main circuit switch and bypass switch are used to control the on and off of the main circuit current during the starting and stopping process, respectively, to ensure the starting and acceleration of the synchronous motor and the safe switching of the system to the normal operating state;

[0012] The tripping protection system will automatically trip if an abnormal signal is detected during the startup process, disconnecting the SFC input and output switches and stopping the cooling system and oil pump operation.

[0013] Optionally, it also includes a neuromorphic computing and physical field perception module. The neuromorphic computing and physical field perception module is combined with a physical field sensor network to monitor the electromagnetic field, thermal field and fluid mechanics parameters during the motor startup process in real time, and to perform real-time processing of the collected multi-physical field data through neuromorphic computing to achieve dynamic adaptive adjustment of the cooling system and motor operating parameters.

[0014] Optionally, the steps of implementing dynamic adaptive adjustment of the cooling system and motor operating parameters through the morphological calculation and physical field perception module are as follows:

[0015] The sensors monitor the current, voltage and magnetic field changes inside the motor and the temperature fluctuations in the motor and cooling system as well as the flow rate, pressure and flow rate of the coolant in real time, and then transmit the detected data to the neuromorphic computing module;

[0016] The neuromorphic computing module receives electromagnetic field, thermal field and fluid dynamics parameters through a neural network architecture, mimics the working mode of the biological nervous system, processes multi-dimensional data in parallel, and generates an adaptive adjustment strategy for the current working state of the cooling system and the motor. The expression is: F(t) = σ(W*X(t) + b).

[0017] Based on the data processed by neuromorphic computing, the module uses the formula A(t) = W fc ·F(t)+b fc Generate dynamic adaptive adjustment strategies and during system operation, the neuromorphic computing module continuously receives the latest data from sensors and provides real-time feedback on whether the adjustments made are effective;

[0018] The state change before the fault occurs is predicted by the formula A(t+Δt)=f(X(t+Δt), F(t))A(t+Δt), and the parameters are adjusted in time. If the adjustment cannot effectively prevent the fault, the system will start the tripping protection logic, automatically shut down the motor operation and stop the cooling system. At the same time, let E(t) be the fault state prediction function. If E(t)≥∈, the tripping protection Z(t) is triggered, which is expressed as: Where X(t) is the multidimensional physical field data vector collected by the sensor, W fc is the weight matrix of the neural network, b fc is the bias of the neural network, σ(·) is the activation function used for nonlinear processing, F(t) is the feature map, the features extracted by the neural network, A(t) is the adaptive adjustment strategy, f(·) is the feedback function, which generates adjustments based on the current state and historical data, E(t) is the fault prediction function, ∈ is the fault prediction threshold, and Z(t) is the trip protection logic output, 1 indicates triggering tripping, and 0 indicates that the system is normal.

[0019] Optionally, the neural network architecture of the neuromorphic computing module includes an input layer, a convolution layer, a pooling layer, and an output layer. The input layer is used to input physical field data, including data from electromagnetic field, thermal field, and fluid mechanics sensors. The input data dimension is [batch_size, 64, 64, 3], where batch_size represents the batch size, 64x 64 is the spatial dimension of the input data, and 3 is the number of channels of the electromagnetic field, temperature field, and fluid field.

[0020] The number of convolutional layers is three, and each layer contains multiple convolution kernels, which are used to gradually extract the local spatial features of the operating status of the motor and cooling system from the physical field data;

[0021] Among them, convolution layer 1 has 32 convolution kernels, each convolution kernel size is 3x 3, the step size is 1x 1, the ReLU activation function is used, the padding method is the same, and the output dimension is [batch_size, 64, 64, 32];

[0022] Convolutional layer 2 has 64 convolution kernels, each of which is 3x 3 in size, with a step size of 1x 1, uses ReLU activation function, has the same padding method, and has an output dimension of [batch_size, 64, 64, 64];

[0023] The pooling size of the pooling layer is 2x 2, the stride is 2x 2, and the output dimension is [batch_size, 32, 32, 64];

[0024] Convolutional layer 3 has 128 convolution kernels, each of which is 3x 3 in size, with a step size of 1x1, uses the ReLU activation function, has the same padding method, and has an output dimension of [batch_size, 32, 32, 128];

[0025] The output layer has a fully connected layer, which is used to generate adaptive adjustment parameters of the cooling system and the motor according to the features extracted by the convolution layer. The output includes adjustment instructions for cooling water flow, air cooling system power and motor excitation current. The output layer maps the features of the convolution layer to the output adjustment parameters through the fully connected layer.

[0026] Optionally, the steps of parallel processing of multi-dimensional physical field data include:

[0027] The multi-dimensional physical field data is input into the input layer of the neural network. Then, local features are extracted from multiple parallel convolution kernels to form preliminary feature maps of different physical fields. Subsequently, in the convolution layer, multiple convolution kernels are used to perform parallel convolution operations on the input multi-dimensional data to extract the spatial features of each physical field, and the extracted features are processed nonlinearly through activation functions to obtain feature representations at different levels. Then, the feature map extracted by the convolution layer is reduced in dimension through the pooling layer to retain the most important spatial features and reduce the data dimension. The spatial information of different physical field data is merged into a unified feature representation through feature fusion. Finally, after the data of different physical fields are processed in parallel in the convolution layer and the pooling layer, the extracted features are input into the fully connected layer to calculate the current working status of the cooling system and the motor. The expression is: Among them, X f Input data for the fth physical field (electromagnetic field, thermal field, fluid field, etc.), W f is the weight of the fth convolution kernel, * is the convolution operator, indicating the convolution operation, b f is the bias term of the convolution kernel, σ(·) is the activation function ReLU, pool(·, s) is the pooling operation, the step size is s, α f is the feature fusion weight of physical field data, W fc is the weight matrix of the fully connected layer, b fc is the bias term of the fully connected layer, and y is the final output result, which is used to adjust the cooling system and motor operating parameters.

[0028] Optionally, the steps for controlling the on and off of the main circuit current during the start and stop process are:

[0029] After the unit monitoring system issues a start command, the bypass switch is closed first, and the starting current is provided to the synchronous motor through the bypass circuit, ensuring that the motor gradually increases its speed at a low speed. The bypass switch is closed at the beginning of the starting process, so that the current enters the synchronous motor through the bypass circuit.

[0030] When the speed of the synchronous motor reaches the predetermined switching frequency, the main circuit switch is closed, the current path is switched, and the main circuit current takes over the motor operation, so that the motor enters the normal working state and continues to accelerate to the rated speed;

[0031] After the main circuit breaker is closed and takes over the motor operation, the bypass switch is opened to cut off the current from the bypass circuit, ensuring that the main circuit becomes the only path for the current, avoiding current diversion or system instability;

[0032] When the unit monitoring system issues a stop command, the main circuit breaker is first opened to cut off the main circuit channel of the current, ensuring that the synchronous motor slows down smoothly to a stop state. At the same time, the bypass switch is started to close to transition the current to avoid the impact of sudden power outages on the system.

[0033] Optionally, after the SFC system start command is issued, the unit monitoring system first issues a command to start the cooling water circulation, the cooling water electric valve opens, allowing deionized water to enter the cooling circuit, and at the same time, the input variable oil pump starts to provide cooling oil to the high-power inverter equipment in the main circuit to ensure the temperature control of the system in the initial stage;

[0034] When the unit monitoring system confirms that the oil pump is started and running normally and the cooling circuit is ready, it issues a deionized water pump start command. After the deionized water pump is started, deionized water is pumped into the cooling system of the SFC main circuit and cools the high-power commutation equipment through pipelines.

[0035] A pumped storage unit water-cooled static frequency converter startup control method, a static frequency converter SFC startup control method, a static frequency converter SFC startup control method, a water-cooled SFC+oil transformer trip stop control logic, and a static frequency converter SFC startup control method comprising the following steps:

[0036] S1: SFC hot standby preparation steps: The unit monitoring system issues an "SFC hot standby command", starts the cooling system, and opens the input / output variable cooling water electric valve to ensure that the system enters the hot standby state and is ready to start;

[0037] S2: Oil pump and deionized water pump start-up steps: After the SFC system issues the "input / output variable oil pump start-up command" and monitors its normal operation, the deionized water pump is started to ensure that the oil flow and deionized water flow are normal to meet the system cooling requirements;

[0038] S3: SFC input switch closing step: After the cooling system works normally, the SFC system issues an "input switch closing command" to connect the motor input circuit, provide a power channel for the motor to start, and the system switches from cold standby to hot standby;

[0039] S4: Bypass switch closing step: The SFC system issues a "bypass switch closing command" to provide starting current to the motor through the bypass circuit, so that the motor begins to accelerate and enter the starting process;

[0040] S5: SFC output switch closing step: After the bypass switch is successfully closed, the SFC system issues an "output switch closing command" to connect the motor output circuit and accelerate the motor to the operating frequency;

[0041] S6: Main circuit switching step: When the unit frequency reaches the preset value, the SFC system issues a "bypass switch opening command" and then closes the main circuit switch, so that the system switches to the main circuit power supply, and the motor enters normal operation;

[0042] S7: Fault detection and tripping steps: The SFC system monitors the status of key equipment in real time during the startup process. If any signal is abnormal, the tripping logic is immediately triggered to disconnect the motor and stop the system operation to ensure safety.

[0043] Optionally, the startup control method of the static frequency converter SFC includes the following steps:

[0044] A1: After receiving the "synchronous closing command" from the unit LCU, the SFC system immediately issues the "SFC output switch opening command" to disconnect the output switch and start system status switching;

[0045] A2: After receiving the "SFC output switch opening position" signal, the SFC system issues a "main circuit switch opening command" to cut off the main circuit current, allowing the system to enter the hot standby state;

[0046] A3: After receiving the "main circuit switch opening position" signal, the SFC system issues an "output variable oil pump stop command" to shut down the oil pump and complete the system switching from the operating state to the hot standby state;

[0047] A4: After receiving the "hot standby to cold standby command", the SFC system issues the "SFC input switch opening command" to disconnect the input circuit and start the cold standby conversion phase;

[0048] A5: After receiving the "SFC input switch open position" signal, the SFC system issues the "SFC deionized water pump stop command" and the "input variable oil pump stop command" to gradually shut down the cooling and lubrication systems to ensure safe shutdown of the equipment;

[0049] A6: The SFC system detects the "deionized water pump is running normally", "deionized water flow is normal" and "input variable oil pump stop status" signals to ensure that the cooling and oil pump system are in normal status and the equipment enters full cold standby status;

[0050] A7: During the shutdown of the auxiliary equipment, the unit LCU issued an "input / output converter cooling water electric valve closing command" to close the cooling water electric valve, and the SFC system successfully completed the conversion from hot standby to cold standby.

[0051] Optionally, the water-cooled SFC+oil transformer trip stop control logic includes the following steps:

[0052] B1: During the SFC startup process, when a fault is detected and the trip logic is triggered, the SFC system simultaneously issues the "SFC input switch trip command" and the "SFC output switch opening command" to quickly cut off the input and output circuits;

[0053] B2: After receiving the "SFC output switch opening position" signal, the SFC system immediately issues a "main circuit switch opening command" or "bypass switch opening command" to ensure that the main circuit or bypass circuit is cut off and the fault point is isolated;

[0054] B3: When the SFC system receives the "main circuit switch open position" or "bypass switch open position" signal, it confirms that the current circuit has been completely cut off and is ready to further stop the cooling and lubrication systems;

[0055] B4: The SFC system issues the "SFC deionized water pump stop command" and the "input / output variable oil pump stop command" to stop the operation of the cooling water pump and the oil pump to ensure that the system temperature and lubrication are effectively controlled during the fault;

[0056] B5: When the unit LCU is executing the auxiliary machine shutdown process, the unit LCU issues an "input / output variable cooling water electric valve closing command" to gradually close the cooling water electric valve to ensure that the water cooling system is completely stopped and the system enters the cold standby state;

[0057] B6: The SFC system continuously monitors the stop status of the deionized water pump, oil pump and cooling water electric valve. After confirming that all subsystems are completely stopped, the system enters a safe shutdown state and prepares for recovery or maintenance;

[0058] B7: If the SFC system does not receive any of the expected feedback signals mentioned above, the alarm logic will be triggered immediately, the system will record the abnormality and continue the process, and at the same time notify the operator to further troubleshoot the problem.

[0059] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all the advantages described below at the same time:

[0060] The beneficial effect of the present invention is that the stator current and excitation current of the synchronous motor are controlled by the static frequency converter, so as to realize the low-frequency starting and smooth acceleration of the motor, avoid the large current impact during the starting process, and extend the service life of the equipment. The water cooling system is combined with the deionized water circulation cooling device to ensure the stable operation of the SFC system under high power conditions and prevent the equipment from overheating. At the same time, the unit monitoring system monitors the entire startup process in real time, and the trip protection system automatically triggers the trip when an abnormality is detected, and shuts down safely. The main circuit and bypass switches ensure smooth switching of the system, and the input / output oil pump further ensures the system temperature control, so that the equipment can still operate safely and efficiently under high load.

[0061] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0063] In the figure:

[0064] Figure 1 This is a typical control logic diagram of SFC hot standby;

[0065] Figure 2 This is a schematic diagram of the SFC tripping process.

[0066] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0067] The present invention will now be described in further detail with reference to the accompanying drawings.

[0068] See also Figure 1-2 As shown, in this embodiment, a water-cooled static inverter starting control system for a pumped storage unit is provided, including a static inverter, which is used to control the stator current and excitation current of the synchronous motor, and complete the low-frequency starting and acceleration of the synchronous motor by changing the magnetic field and torque inside the synchronous motor;

[0069] Water cooling system, including deionized water circulation cooling device, is used to cool the high-power commutation equipment in the main circuit of the SFC system to ensure the safe operation of the system under high current conditions;

[0070] The unit monitoring system is used to monitor and control the entire startup process, issue startup commands, monitor the operating status of cooling water and oil pumps, ensure the normal operation of each subsystem, and trigger the trip logic in case of abnormalities;

[0071] Input / output oil pump, used to provide cooling oil for the commutation equipment in the main circuit of the SFC system to ensure the temperature control of the system;

[0072] The main circuit switch and bypass switch are used to control the on and off of the main circuit current during the starting and stopping process, respectively, to ensure the starting and acceleration of the synchronous motor and the safe switching of the system to the normal operating state;

[0073] The tripping protection system will automatically trip if an abnormal signal is detected during the startup process, disconnecting the SFC input and output switches and stopping the cooling system and oil pump operation.

[0074] The present embodiment also includes a neuromorphic computing and physical field perception module, which is combined with a physical field sensor network to monitor the electromagnetic field, thermal field and fluid mechanics parameters during the motor startup process in real time, and to process the collected multi-physical field data in real time through neuromorphic computing to achieve dynamic adaptive adjustment of the cooling system and motor operating parameters. By combining the physical field sensor network and neuromorphic computing technology, the system can monitor the electromagnetic field, thermal field and fluid mechanics parameters during the motor startup process in real time. The neural network architecture is used to perform parallel processing of multi-dimensional data to achieve dynamic adaptive adjustment of the cooling system and motor operating parameters. This not only improves the intelligence level of the system, but also makes the operation of the motor more efficient and stable, reduces the risk of overheating and current shock during operation, and extends the service life of the equipment.

[0075] In addition, by collecting the current, voltage and magnetic field data inside the motor in real time, and combining it with the temperature, flow rate, pressure and other data of the cooling system, the neuromorphic computing module can process these multi-dimensional data in parallel through the neural network architecture. This method can accurately analyze the current working status of the system in the dynamic changes of complex physical fields, and generate adaptive adjustment strategies to ensure that the motor and cooling system can maintain efficient operation under different operating conditions.

[0076] In this embodiment, the steps of implementing dynamic adaptive adjustment of the cooling system and motor operating parameters through the morphological calculation and physical field perception module are as follows:

[0077] The sensors monitor the current, voltage and magnetic field changes inside the motor and the temperature fluctuations in the motor and cooling system as well as the flow rate, pressure and flow rate of the coolant in real time, and then transmit the detected data to the neuromorphic computing module;

[0078] The neuromorphic computing module receives electromagnetic field, thermal field and fluid dynamics parameters through a neural network architecture, mimics the working mode of the biological nervous system, processes multi-dimensional data in parallel, and generates an adaptive adjustment strategy for the current working state of the cooling system and the motor. The expression is: F(t) = J(W*X(t)+b).

[0079] Based on the data processed by neuromorphic computing, the module uses the formula A(t) = W fc ·F(t)+b fc Generate dynamic adaptive adjustment strategies and during system operation, the neuromorphic computing module continuously receives the latest data from sensors and provides real-time feedback on whether the adjustments made are effective;

[0080] The state change before the fault occurs is predicted by the formula A(t+Δt)=f(X(t+Δt), F(t))A(t+Δt), and the parameters are adjusted in time. If the adjustment cannot effectively prevent the fault, the system will start the tripping protection logic, automatically shut down the motor operation and stop the cooling system. At the same time, let E(t) be the fault state prediction function. If E(t)≥∈, the tripping protection Z(t) is triggered, which is expressed as: Where X(t) is the multidimensional physical field data vector collected by the sensor, W fc is the weight matrix of the neural network, b fc is the bias of the neural network, σ(·) is the activation function for nonlinear processing, F(t) is the feature map, the features extracted by the neural network, A(t) is the adaptive adjustment strategy, f(·) is the feedback function, which generates adjustments based on the current state and historical data, E(t) is the fault prediction function, ∈ is the fault prediction threshold, and Z(t) is the trip protection logic output, 1 indicates a trip is triggered, and 0 indicates that the system is normal. The neuromorphic computing module can predict possible faults in the motor or cooling system in advance based on the multi-dimensional physical field data collected by the sensor through a preset prediction model. When an abnormal state is detected, the system will adjust the operating parameters in time. If the adjustment cannot avoid the fault, the trip protection will be automatically triggered to ensure that the motor and cooling system can stop quickly in the event of a fault, prevent more serious damage, and improve the safety of the system.

[0081] In this embodiment, the neural network architecture of the neuromorphic computing module includes an input layer, a convolution layer, a pooling layer, and an output layer. The input layer is used to input physical field data, including data from electromagnetic field, thermal field, and fluid mechanics sensors. The input data dimension is [batch size, 64, 64, 3], where batch size represents the batch size, 64x 64 is the spatial dimension of the input data, and 3 is the number of channels of the electromagnetic field, temperature field, and fluid field.

[0082] The number of convolutional layers is three, and each layer contains multiple convolution kernels, which are used to gradually extract the local spatial features of the operating status of the motor and cooling system from the physical field data;

[0083] Among them, convolution layer 1 has 32 convolution kernels, each convolution kernel size is 3x 3, the step size is 1x 1, the ReLU activation function is used, the padding method is the same, and the output dimension is [batch_size, 64, 64, 32];

[0084] Convolutional layer 2 has 64 convolution kernels, each of which is 3x 3 in size, with a step size of 1x 1, uses ReLU activation function, has the same padding method, and has an output dimension of [batch_size, 64, 64, 64];

[0085] The pooling size of the pooling layer is 2x 2, the stride is 2x 2, and the output dimension is [batch_size, 32, 32, 64];

[0086] Convolutional layer 3 has 128 convolution kernels, each of which is 3x 3 in size, with a step size of 1x1, uses the ReLU activation function, has the same padding method, and has an output dimension of [batch_size, 32, 32, 128];

[0087] The output layer has a fully connected layer, which is used to generate adaptive adjustment parameters for the cooling system and the motor based on the features extracted by the convolution layer. The output includes adjustment instructions for cooling water flow, air cooling system power, and motor excitation current, where the output layer maps the features of the convolution layer to the output adjustment parameters through the fully connected layer. The input layer, convolution layer, and pooling layer of the neural network architecture perform spatial feature extraction and dimensionality reduction processing on the input physical field data through multiple layers of convolution kernels. Through refined feature extraction and processing, the neural network can efficiently integrate the operating data of the motor and cooling system to generate accurate adaptive adjustment parameters. This optimized processing method greatly improves the response speed and adjustment accuracy of the system, enabling it to operate stably under high load conditions.

[0088] In this embodiment, the step of parallel processing of multi-dimensional physical field data includes:

[0089] The multi-dimensional physical field data is input into the input layer of the neural network. Then, local features are extracted from multiple parallel convolution kernels to form preliminary feature maps of different physical fields. Subsequently, in the convolution layer, multiple convolution kernels are used to perform parallel convolution operations on the input multi-dimensional data to extract the spatial features of each physical field, and the extracted features are processed nonlinearly through activation functions to obtain feature representations at different levels. Then, the feature map extracted by the convolution layer is reduced in dimension through the pooling layer to retain the most important spatial features and reduce the data dimension. The spatial information of different physical field data is merged into a unified feature representation through feature fusion. Finally, after the data of different physical fields are processed in parallel in the convolution layer and the pooling layer, the extracted features are input into the fully connected layer to calculate the current working status of the cooling system and the motor. The expression is: Among them, X f Input data for the fth physical field (electromagnetic field, thermal field, fluid field, etc.), W f is the weight of the fth convolution kernel, * is the convolution operator, indicating the convolution operation, b f is the bias term of the convolution kernel, σ(·) is the activation function ReLU, pool(·, s) is the pooling operation, the step size is s, α f is the feature fusion weight of physical field data, W fc is the weight matrix of the fully connected layer, b fc is the bias term of the fully connected layer, and y is the final output result, which is used to adjust the cooling system and motor operating parameters. During the start and stop of the motor, the main circuit and bypass switch respectively control the on and off of the current to ensure the smooth switching of the synchronous motor from start to normal operation. The bypass switch is closed first at startup to provide the starting current through the bypass circuit. The main circuit switch is closed after the motor accelerates to take over the current, ensuring the stability of the current path and the smooth transition of the motor acceleration process, effectively reducing the current shock.

[0090] In this embodiment, the steps for controlling the on and off of the main circuit current during the start and stop process are:

[0091] After the unit monitoring system issues a start command, the bypass switch is closed first, and the starting current is provided to the synchronous motor through the bypass circuit, ensuring that the motor gradually increases its speed at a low speed. The bypass switch is closed at the beginning of the starting process, so that the current enters the synchronous motor through the bypass circuit.

[0092] When the speed of the synchronous motor reaches the predetermined switching frequency, the main circuit switch is closed, the current path is switched, and the main circuit current takes over the motor operation, so that the motor enters the normal working state and continues to accelerate to the rated speed;

[0093] After the main circuit breaker is closed and takes over the motor operation, the bypass switch is opened to cut off the current from the bypass circuit, ensuring that the main circuit becomes the only path for the current, avoiding current diversion or system instability;

[0094] When the unit monitoring system issues a stop command, the main circuit breaker is first opened to cut off the main circuit channel of the current, ensuring that the synchronous motor slows down smoothly to a stop state. At the same time, the bypass switch is started to close to transition the current to avoid the impact of sudden power outages on the system.

[0095] In this embodiment, after the SFC system start command is issued, the unit monitoring system first issues a command to start the cooling water circulation, the cooling water electric valve is opened, and deionized water is allowed to enter the cooling circuit. At the same time, the input variable oil pump is started to provide cooling oil to the high-power inverter equipment in the main circuit to ensure the temperature control of the system in the initial stage;

[0096] When the unit monitoring system confirms that the oil pump is started and running normally, and the cooling circuit is ready, it issues a deionized water pump start command. After the deionized water pump is started, deionized water is pumped into the cooling system of the SFC main circuit, and the high-power commutation equipment is cooled through the pipeline. During the motor start-up process, the unit monitoring system controls the start-up of the cooling water electric valve and the oil pump in turn to ensure that the high-power commutation equipment in the main circuit is fully cooled. Through the coordinated work of the deionized water pump and the oil pump, the system provides stable cooling and lubrication at the initial startup, ensuring that the temperature and working state of the commutation equipment are within a safe range, effectively preventing the equipment from being damaged due to excessive temperature.

[0097] In this embodiment, the steps of using the unit monitoring system to monitor and control the startup process are:

[0098] After detecting that the starting conditions are met, the unit monitoring system issues a start command to start the cooling system, oil pump and bypass switch in sequence to ensure that the synchronous motor enters the starting preparation state;

[0099] During the startup process, the unit monitoring system continuously monitors the operating status of the water pump of the deionized water circulation cooling system and key parameters such as the flow rate and pressure of the oil pump to ensure that the cooling water and lubricating oil circulate at the predetermined flow rate and temperature;

[0100] The unit monitoring system monitors the real-time status of each subsystem (such as cooling system, transformer, static variable frequency starter, etc.) through a sensor network, confirms that the operating parameters of each subsystem are within the safe range, and issues an alarm when a subsystem is abnormal or the operating status is abnormal;

[0101] When the unit monitoring system detects an abnormal situation (such as excessive cooling water temperature, abnormal oil pump flow, abnormal current fluctuation, etc.), the system automatically triggers an early warning and attempts to make adjustments or repairs based on the preset logic. If the fault fails to recover automatically, the system will continue to monitor status changes and prepare to perform a trip operation;

[0102] When the abnormal situation persists and cannot be resolved through automatic adjustment, the unit monitoring system issues a trip command, disconnects the main circuit and bypass switches in sequence, stops the motor, and shuts down the cooling water pump and oil pump;

[0103] After the fault is resolved, the unit monitoring system checks the status of each subsystem, confirms that all systems have returned to a safe state, resets the trip logic and prepares for the next startup process. The unit monitoring system monitors the operating status of the cooling system and oil pump in real time during the startup process, and obtains the operating parameters of each subsystem through the sensor network. When an abnormality occurs, the system automatically triggers an early warning and makes adjustments according to the set logic. If the fault cannot be automatically restored, the system will trigger the trip logic, disconnect the main circuit and bypass switch in turn, stop the motor and cooling system, and ensure the safety and stability of the entire system.

[0104] A pumped storage unit water-cooled static frequency converter startup control method, a static frequency converter SFC startup control method, a static frequency converter SFC startup control method, a water-cooled SFC+oil transformer trip stop control logic, and a static frequency converter SFC startup control method comprising the following steps:

[0105] S1: SFC hot standby preparation steps: The unit monitoring system issues an "SFC hot standby command", starts the cooling system, and opens the input / output transformer cooling water electric valve to ensure that the system enters the hot standby state and is ready to start.

[0106] S2: Oil pump and deionized water pump start-up steps: After the SFC system issues the "input / output variable oil pump start-up command" and monitors its normal operation, it starts the deionized water pump to ensure that the oil flow and deionized water flow are normal to meet the system cooling requirements.

[0107] S3: SFC input switch closing steps: After the cooling system works normally, the SFC system issues an "input switch closing command" to connect the motor input circuit, provide a power channel for the motor to start, and the system switches from cold standby to hot standby.

[0108] S4: Bypass switch closing step: The SFC system issues a "bypass switch closing command" to provide starting current to the motor through the bypass circuit, causing the motor to accelerate and enter the starting process.

[0109] S5: SFC output switch closing step: After the bypass switch is successfully closed, the SFC system issues an "output switch closing command" to connect the motor output circuit and accelerate the motor to the operating frequency.

[0110] S6: Main circuit switching step: When the unit frequency reaches the preset value, the SFC system issues a "bypass switch opening command" and immediately closes the main circuit switch, so that the system switches to the main circuit power supply and the motor enters normal operation.

[0111] S7: Fault detection and tripping steps: The SFC system monitors the status of key equipment in real time during the startup process. If any signal is abnormal, the tripping logic is immediately triggered to disconnect the motor and stop the system operation to ensure safety.

[0112] In this embodiment, the startup control method of the static frequency converter SFC includes the following steps:

[0113] A1: After receiving the "synchronous closing command" from the unit LCU, the SFC system immediately issues the "SFC output switch opening command" to disconnect the output switch and start the system state switching;

[0114] A2: After receiving the "SFC output switch opening position" signal, the SFC system issues a "main circuit switch opening command" to cut off the main circuit current, allowing the system to enter the hot standby state;

[0115] A3: After receiving the "main circuit switch opening position" signal, the SFC system issues an "output variable oil pump stop command" to shut down the oil pump and complete the system switching from the operating state to the hot standby state;

[0116] A4: After receiving the "hot standby to cold standby command", the SFC system issues the "SFC input switch opening command" to disconnect the input circuit and start the cold standby conversion phase;

[0117] A5: After receiving the "SFC input switch open position" signal, the SFC system issues the "SFC deionized water pump stop command" and the "input variable oil pump stop command" to gradually shut down the cooling and lubrication systems to ensure safe shutdown of the equipment;

[0118] A6: The SFC system detects the "deionized water pump is running normally", "deionized water flow is normal" and "input variable oil pump stop status" signals to ensure that the cooling and oil pump system are in normal status and the equipment enters full cold standby status;

[0119] A7: During the shutdown of the auxiliary equipment, the unit LCU issued an "input / output converter cooling water electric valve closing command" to close the cooling water electric valve, and the SFC system successfully completed the conversion from hot standby to cold standby.

[0120] In this embodiment, the water-cooled SFC+oil transformer trip stop control logic includes the following steps:

[0121] B1: During the SFC startup process, when a fault is detected and the tripping logic is triggered, the SFC system simultaneously issues the "SFC input switch trip command" and the "SFC output switch opening command" to quickly cut off the input and output circuits.

[0122] B2: After receiving the "SFC output switch opening position" signal, the SFC system immediately issues a "main circuit switch opening command" or a "bypass switch opening command" to ensure that the main circuit or bypass circuit is cut off and the fault point is isolated.

[0123] B3: When the SFC system receives the "main circuit breaker open position" or "bypass switch open position" signal, it confirms that the current circuit has been completely cut off and is ready to further stop the cooling and lubrication system.

[0124] B4: The SFC system issues the "SFC deionized water pump stop command" and the "input / output variable oil pump stop command" to stop the operation of the cooling water pump and the oil pump to ensure that the system temperature and lubrication are effectively controlled during the fault.

[0125] B5: When the unit LCU is executing the auxiliary machine shutdown process, the unit LCU issues an "input / output variable cooling water electric valve closing command" to gradually close the cooling water electric valve to ensure that the water cooling system is completely stopped and the system enters the cold standby state.

[0126] B6: The SFC system continuously monitors the stop status of the deionized water pump, oil pump and cooling water electric valve. After confirming that all subsystems are completely stopped, the system enters a safe shutdown state and prepares for recovery or maintenance.

[0127] B7: If the SFC system does not receive any of the expected feedback signals mentioned above, the alarm logic will be triggered immediately, the system will record the abnormality and continue the process, and at the same time notify the operator to further troubleshoot the problem.

[0128] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

Claims

1. A water-cooled static inverter start-up control system for a pumped storage unit, characterized in that: include: Static frequency converter, used to control the stator current and excitation current of the synchronous motor, and complete the low-frequency starting and acceleration of the synchronous motor by changing the magnetic field and torque inside the synchronous motor; Water cooling system, including deionized water circulation cooling device, is used to cool the high-power commutation equipment in the main circuit of the SFC system to ensure the safe operation of the system under high current conditions; The unit monitoring system is used to monitor and control the entire startup process, issue startup commands, monitor the operating status of cooling water and oil pumps, ensure the normal operation of each subsystem, and trigger the trip logic in case of abnormalities; Input / output oil pump, used to provide cooling oil for the commutation equipment in the main circuit of the SFC system to ensure the temperature control of the system; The main circuit switch and bypass switch are used to control the on and off of the main circuit current during the starting and stopping process, respectively, to ensure the starting and acceleration of the synchronous motor and the safe switching of the system to the normal operating state; The tripping protection system will automatically trip if an abnormal signal is detected during the startup process, disconnecting the SFC input and output switches and stopping the cooling system and oil pump operation.

2. A pumped storage unit water-cooled static inverter start-up control system according to claim 1, characterized in that: It also includes a neuromorphic computing and physical field perception module. The neuromorphic computing and physical field perception module is combined with a physical field sensor network to monitor the electromagnetic field, thermal field and fluid mechanics parameters during the motor startup process in real time, and to process the collected multi-physical field data in real time through neuromorphic computing to achieve dynamic adaptive adjustment of the cooling system and motor operating parameters.

3. A pumped storage unit water-cooled static inverter start-up control system according to claim 2, characterized in that: The steps to achieve dynamic adaptive adjustment of cooling system and motor operating parameters through morphological calculation and physical field perception module are as follows: The sensors monitor the current, voltage and magnetic field changes inside the motor and the temperature fluctuations in the motor and cooling system as well as the flow rate, pressure and flow rate of the coolant in real time, and then transmit the detected data to the neuromorphic computing module; The neuromorphic computing module receives electromagnetic field, thermal field and fluid dynamics parameters through a neural network architecture, imitates the working mode of the biological nervous system, processes multi-dimensional data in parallel, and generates an adaptive adjustment strategy for the current working state of the cooling system and the motor, which is expressed as: F(t) = σ(W*X(t) + b); Based on the data processed by neuromorphic computing, the module uses the formula A(t) = W fc ·F(t)+b fc Generate dynamic adaptive adjustment strategies and during system operation, the neuromorphic computing module continuously receives the latest data from sensors and provides real-time feedback on whether the adjustments made are effective; The state change before the fault occurs is predicted by the formula A(t+Δt)=f(X(t+Δt), F(t))A(t+Δt), and the parameters are adjusted in time. If the adjustment cannot effectively prevent the fault, the system will start the tripping protection logic, automatically shut down the motor operation and stop the cooling system. At the same time, let E(t) be the fault state prediction function. If E(t)≥∈, the tripping protection Z(t) is triggered, which is expressed as: Where X(t) is the multidimensional physical field data vector collected by the sensor, W fc is the weight matrix of the neural network, b fc is the bias of the neural network, σ(·) is the activation function used for nonlinear processing, F(t) is the feature map, the features extracted by the neural network, A(t) is the adaptive adjustment strategy, f(·) is the feedback function, which generates adjustments based on the current state and historical data, E(t) is the fault prediction function, ∈ is the fault prediction threshold, and Z(t) is the trip protection logic output, 1 indicates triggering tripping, and 0 indicates that the system is normal.

4. A pumped storage unit water-cooled static inverter start-up control system according to claim 3, characterized in that: The neural network architecture of the neuromorphic computing module includes an input layer, a convolution layer, a pooling layer, and an output layer. The input layer is used to input physical field data, including data from electromagnetic field, thermal field, and fluid mechanics sensors. The input data dimension is [batch_size, 64, 64, 3], where batch_size represents the batch size, 64x64 is the spatial dimension of the input data, and 3 is the number of channels for the electromagnetic field, temperature field, and fluid field. The number of convolutional layers is three, and each layer contains multiple convolution kernels, which are used to gradually extract the local spatial features of the operating status of the motor and cooling system from the physical field data; Among them, convolution layer 1 has 32 convolution kernels, each convolution kernel size is 3x3, the step size is 1x1, the ReLU activation function is used, the padding method is the same, and the output dimension is [batch_size, 64, 64, 32]; Convolutional layer 2 has 64 convolution kernels, each of which is 3x3 in size, 1x1 in stride, uses ReLU activation function, has the same padding, and has an output dimension of [batch_size, 64, 64, 64]; The pooling size of the pooling layer is 2x2, the stride is 2x2, and the output dimension is [batch_size, 32, 32, 64]; Convolutional layer 3 has 128 convolution kernels, each of which is 3x3 in size, 1x1 in stride, uses ReLU activation function, has the same padding, and has an output dimension of [batch_size, 32, 32, 128]; The output layer has a fully connected layer, which is used to generate adaptive adjustment parameters of the cooling system and the motor according to the features extracted by the convolution layer. The output includes adjustment instructions for cooling water flow, air cooling system power and motor excitation current. The output layer maps the features of the convolution layer to the output adjustment parameters through the fully connected layer.

5. A pumped storage unit water-cooled static inverter start-up control system according to claim 4, characterized in that: The steps for parallel processing of multi-dimensional physics data include: The multi-dimensional physical field data is input into the input layer of the neural network. Then, local features are extracted from multiple parallel convolution kernels to form preliminary feature maps of different physical fields. Subsequently, in the convolution layer, multiple convolution kernels are used to perform parallel convolution operations on the input multi-dimensional data to extract the spatial features of each physical field, and the extracted features are processed nonlinearly through activation functions to obtain feature representations at different levels. Then, the feature map extracted by the convolution layer is reduced in dimension through the pooling layer to retain the most important spatial features and reduce the data dimension. The spatial information of different physical field data is merged into a unified feature representation through feature fusion. Finally, after the data of different physical fields are processed in parallel in the convolution layer and the pooling layer, the extracted features are input into the fully connected layer to calculate the current working status of the cooling system and the motor. The expression is: Among them, X f Input data for the fth physics field, W f is the weight of the fth convolution kernel, * is the convolution operator, indicating the convolution operation, b f is the bias term of the convolution kernel, σ(·) is the activation function ReLU, pool(·, s) is the pooling operation, the step size is s, α f is the feature fusion weight of physical field data, W fc is the weight matrix of the fully connected layer, b fc is the bias term of the fully connected layer, and y is the final output result, which is used to adjust the cooling system and motor operating parameters.

6. A pumped storage unit water-cooled static inverter start-up control system according to claim 1, characterized in that: The steps to control the on and off of the main circuit current during the start and stop process are: After the unit monitoring system issues a start command, the bypass switch is closed first, and the starting current is provided to the synchronous motor through the bypass circuit, ensuring that the motor gradually increases its speed at a low speed. The bypass switch is closed at the beginning of the starting process, so that the current enters the synchronous motor through the bypass circuit. When the speed of the synchronous motor reaches the predetermined switching frequency, the main circuit switch is closed, the current path is switched, and the main circuit current takes over the motor operation, so that the motor enters the normal working state and continues to accelerate to the rated speed; After the main circuit breaker is closed and takes over the motor operation, the bypass switch is opened to cut off the current from the bypass circuit, ensuring that the main circuit becomes the only path for the current, avoiding current diversion or system instability; When the unit monitoring system issues a stop command, the main circuit breaker is first opened to cut off the main circuit channel of the current, ensuring that the synchronous motor slows down smoothly to a stop state. At the same time, the bypass switch is started to close to transition the current to avoid the impact of sudden power outages on the system.

7. A pumped storage unit water-cooled static inverter start-up control system according to claim 1, characterized in that: After the SFC system start command is issued, the unit monitoring system first issues a command to start the cooling water circulation. The cooling water electric valve opens to allow deionized water to enter the cooling circuit. At the same time, the input variable oil pump starts to provide cooling oil to the high-power inverter equipment in the main circuit to ensure the temperature control of the system in the initial stage. When the unit monitoring system confirms that the oil pump is started and running normally and the cooling circuit is ready, it issues a deionized water pump start command. After the deionized water pump is started, deionized water is pumped into the cooling system of the SFC main circuit and cools the high-power commutation equipment through pipelines.

8. A pumped storage unit water-cooled static frequency converter startup control method, a static frequency converter SFC startup control method, a static frequency converter SFC startup control method, a water-cooled SFC+oil transformer trip stop control logic, characterized in that: The startup control method of the static frequency converter SFC includes the following steps: S1: The unit monitoring system issues an "SFC hot standby command" to start the cooling system and open the input / output variable cooling water electric valve to ensure that the system enters the hot standby state and is ready to start; S2: After the SFC system issues the "input / output variable oil pump start command" and monitors its normal operation, it starts the deionized water pump to ensure that the oil flow and deionized water flow are normal to meet the system cooling requirements; S3: After the cooling system works normally, the SFC system issues an "input switch closing command" to connect the motor input circuit, provide a power channel for the motor to start, and the system switches from cold standby to hot standby; S4: The SFC system issues a "bypass switch closing command" to provide the motor with starting current through the bypass circuit, causing the motor to accelerate and enter the starting process; S5: After the bypass switch is successfully closed, the SSFC system issues an "output switch closing command" to connect the motor output circuit and accelerate the motor to the operating frequency; S6: When the unit frequency reaches the preset value, the SFC system issues a "bypass switch opening command" and then closes the main circuit switch, so that the system switches to the main circuit power supply, and the motor enters normal operation; S7: The SFC system monitors the status of key equipment in real time during the startup process. If any signal is abnormal, the trip logic is immediately triggered to disconnect the motor and stop the system operation to ensure safety.

9. A method for starting and controlling a water-cooled static inverter of a pumped storage unit according to claim 8, characterized in that: The startup control method of the static frequency converter SFC includes the following steps: A1: After receiving the "synchronous closing command" from the unit LCU, the SFC system immediately issues the "SFC output switch opening command" to disconnect the output switch and start the system status switching; A2: After receiving the "SFC output switch opening position" signal, the SFC system issues a "main circuit switch opening command" to cut off the main circuit current, allowing the system to enter hot standby mode; A3: After receiving the "main circuit switch opening position" signal, the SFC system issues an "output variable oil pump stop command" to shut down the oil pump and complete the system switching from the operating state to the hot standby state; A4: After receiving the "hot standby to cold standby command", the SFC system issues the "SFC input switch opening command" to disconnect the input circuit and start the cold standby conversion phase; A5: After receiving the "SFC input switch open position" signal, the SFC system issues the "SFC deionized water pump stop command" and the "input variable oil pump stop command", gradually shutting down the cooling and lubrication systems to ensure safe shutdown of the equipment; A6: The SFC system detects the "deionized water pump is running normally", "deionized water flow is normal" and "input variable oil pump is stopped" signals to ensure that the cooling and oil pump systems are in normal condition and the equipment enters a fully cold standby state; A7: During the shutdown of the auxiliary machine, the unit LCU issues an "input / output converter cooling water electric valve closing command" to close the cooling water electric valve, and the SFC system successfully completes the conversion from hot standby to cold standby.

10. A method for starting and controlling a water-cooled static frequency converter of a pumped storage unit according to claim 8, characterized in that: The water-cooled SFC+oil transformer trip stop control logic includes the following steps: B1: During the SFC startup process, when a fault is detected and the trip logic is triggered, the SFC system simultaneously issues the "SFC input switch trip command" and the "SFC output switch opening command" to quickly cut off the input and output circuits; B2: After receiving the "SFC output switch opening position" signal, the SFC system immediately issues a "main circuit switch opening command" or "bypass switch opening command" to ensure that the main circuit or bypass circuit is cut off and the fault point is isolated; B3: When the SFC system receives the "main circuit switch open position" or "bypass switch open position" signal, it confirms that the current circuit has been completely cut off and is ready to further stop the cooling and lubrication systems; B4: The SFC system issues the "SFC deionized water pump stop command" and the "input / output variable oil pump stop command" to stop the operation of the cooling water pump and the oil pump to ensure that the system temperature and lubrication are effectively controlled during the fault period; B5: When the unit LCU is executing the auxiliary machine shutdown process, the unit LCU issues the "input / output variable cooling water electric valve closing command" to gradually close the cooling water electric valve to ensure that the water cooling system is completely stopped and the system enters the cold standby state; B6: The SFC system continuously monitors the stop status of the deionized water pump, oil pump and cooling water electric valve. After confirming that all subsystems are completely stopped, the system enters a safe shutdown state and prepares for recovery or maintenance; B7: If the SFC system does not receive any of the expected feedback signals mentioned above, the alarm logic will be triggered immediately, the system will record the abnormality and continue the process, and at the same time notify the operator to further troubleshoot the problem.

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