437results about "Generator control by field variation" patented technology

The invention discloses a hydroelectric generating set speed regulation control method considering excitation coordination. The method comprises the steps that 1, system state information is collected and preprocessed; step 2, on-line identification of excitation speed regulation coupling characteristics; 3, decomposing a multi-time-scale control target; step 4, designing a self-adaptive multivariable controller; 5, working condition self-adaptive parameter optimization; step 6, intelligently inhibiting the water attack effect; 7, multi-machine cooperative reactive power optimization control is carried out; 8, optimizing and executing a control strategy in real time; the technical problems that excitation speed regulation dynamic coupling, multi-time scale response mismatch, multi-machine cooperative control and the like in a hydroelectric generating set control system cannot be comprehensively solved in the prior art are solved, and the regulation response speed and the system operation safety are improved while the frequency and voltage stability is ensured.

The invention discloses an impedance characteristic remodeling method, device and equipment and a medium, and is applied to the field of wind turbine generators. Wherein the corresponding rotor reference current is determined according to the electromagnetic reactive power, the active power and the corresponding power reference value; correcting the rotor current according to the rotor reference current by adopting a virtual admittance control mode, and generating a corresponding rotor voltage given value; sequentially performing differentiation, filtering and signal extraction processing on the rotor reference current and the rotor current to obtain an impedance remodeling signal; and correcting the rotor voltage given value based on the impedance remodeling signal so as to enable the corrected rotor voltage given value to serve as the control voltage of a rotor side converter in the medium-voltage doubly-fed wind turbine generator after impedance characteristic remodeling. The virtual admittance control mode and the impedance remolding signal mode are adopted to suppress the negative resistance effect of the rotor side converter in the medium-voltage doubly-fed wind turbine generator under voltage disturbance, and therefore the damping effect on external excitation in the sub-super-synchronous frequency band and the high frequency band is higher.

An elevator energy-saving control system of a direct feed network relates to the technical field of elevator energy-saving control, and comprises an energy conversion module for converting kinetic energy and gravitational potential energy generated during operation of an elevator car into direct current; the control system module monitors elevator running state data and power grid parameters in real time, judges whether the elevator is in a power generation state or not according to a monitoring result, automatically starts an energy feedback mode and controls starting and stopping of energy feedback and power adjustment; the inversion grid-connected module is used for converting the direct current into alternating current, processing the generated alternating current and feeding back the electric energy in the form of the processed alternating current to a power grid; and the man-machine interaction module is used for receiving data information of the control system in real time and converting the data information into visual display content, so that a worker can master the operation condition of the system in time and deal with abnormal problems. The elevator running energy consumption is remarkably reduced, the running cost is reduced, meanwhile, the service life of equipment is prolonged, the stability of the equipment is improved, and the influence on the environment is reduced.

The invention discloses a synchronous generator excitation method based on mathematical modeling and gain scheduling, and relates to the technical field of synchronous generator control, and the method comprises the steps: building a synchronous generator global dynamic mathematical model comprising the electromagnetic dynamic characteristics of a stator winding, a rotor winding and a damping winding through a modeling module; a discretization simulation platform is constructed in a Matlab / Simulink environment by utilizing a simulation module, model parameters are corrected, dynamic adjustment is realized through a gain scheduling excitation controller, an automatic voltage regulator (AVR) adopts PID (Proportion Integration Differentiation) control and comprises a voltage deviation integral separation strategy, and a power system stabilizer (PSS) dynamically adjusts parameters of a lead-lag compensator based on active power. According to the method, the deviation between a model and an actual system can be reduced by more than 30%, the electromechanical oscillation damping ratio within the rated power range of 10%-150% is increased by 25%-40%, the harmonic content of exciting current is reduced to be lower than 5%, the stability of an electric power system and the electric energy quality are remarkably improved, the engineering practicability is high, and the method is easy to transform and upgrade on an existing synchronous generator.

The invention discloses a short-circuit current limiting and short-circuit recovery transient voltage control device and method for an aviation three-stage power generation system, and the device comprises a three-stage power generator, a power generator controller, a current sensor, a voltage and current collection module, and an asymmetric half-bridge excitation control circuit. Collecting the output current iL and voltage UL of the generator through a digital processor of the generator controller; when short circuit occurs, the given voltage USet of the voltage regulating loop is linearly reduced in a piecewise mode according to the relation between the iL and a preset threshold value, so that the generator works in a constant power interval; and when the short circuit is recovered, closing the upper / lower power tubes of the asymmetric half-bridge excitation control circuit according to the relationship between UL and a preset threshold value in a grading manner, and triggering a negative-pressure follow-current mode of a main excitation winding of the generator controller to quickly extinguish the field. The method can adapt to different generators without adjusting hardware circuit parameters, has no motor ablation risk during short circuit, has transient voltage less than 350V after short circuit recovery, has no power supply interruption in the whole process, has response delay less than 1ms, and greatly improves the safety and robustness of an aviation power supply and distribution system.

The invention discloses a three-level flexible excitation dynamic regulation and control method and system for a large-scale hydroelectric generating set, and relates to the technical field of flexible excitation control of the large-scale hydroelectric generating set, and the method comprises the steps: setting a DC bus voltage, and initializing a mapping relation between a capacitor voltage and an excitation output level; collecting operation parameters of a machine end, constructing a disturbance identification model and outputting a disturbance level; the excitation voltage output gear is set according to the disturbance level, the capacitor voltage difference is controlled, and dynamic voltage sharing is achieved by modulating the midpoint duty ratio. According to the method, through setting a bus target voltage and constructing excitation voltage output mapping, in combination with a disturbance level identification mechanism and a dynamic voltage-sharing strategy, closed-loop linkage of disturbance perception-voltage regulation-voltage difference control is realized. According to the method, the identification precision of the system on light disturbance and strong disturbance is effectively improved, the voltage stability and capacitance symmetry of the excitation system are enhanced, the overshoot risk is reduced, and the control robustness and safety of the system under extreme working conditions are improved.

The invention discloses a VSG transient stability control method based on PSS power angle compensation and integral reactive loop cooperation, and the method comprises the steps: constructing an improved rotor motion equation compensation mechanism based on a power system stabilizer, and based on the dynamic parameters of the voltages vabc and pcc at a PCC point and the currents iabc and pcc flowing into the PCC point which are collected in real time, carrying out the compensation of the current iabc and pcc at the PCC point under the condition that the working condition is that the voltage of a power grid drops greatly. The dynamic characteristic of active power is ensured; constructing a PSS parameter optimization method based on zero point position constraint; an integral link is embedded in the traditional voltage-reactive droop characteristic, integral reactive loop control is constructed, and steady-state voltage deviation is eliminated; the output compensation power angle delta and the output voltage amplitude E are cooperatively applied and converted into dq-axis voltage components Ed and Eq, the dq-axis voltage components Ed and Eq are sent to a voltage and current double closed loop, a driving signal is generated through SVPWM, and the stability of the system is enhanced.

The invention provides a phase modifier energy storage excitation control method and system and a controller. The method comprises the following steps: acquiring original phase modifier parameters, original power grid parameters and original energy storage system parameters; generating a power grid operation state according to the original phase modifier parameters, the original power grid parameters and the original energy storage system parameters; adjusting the energy storage system and the flexible excitation power unit according to the power grid operation state and a cooperative control strategy, and obtaining the adjusted current phase modifier parameters and the adjusted current power grid parameters; damping control is carried out according to current phase modifier parameters and current power grid parameters through preset double damping channels, data can be monitored and analyzed in real time, a cooperative control strategy is adopted, an energy storage system is effectively utilized to improve the transient stability of the phase modifier, and the effect of suppressing subsynchronous oscillation is enhanced through cooperative control of the double damping channels. Therefore, the dynamic stability of the grid voltage is improved.

The invention discloses an automobile generator self-adaptive excitation control method based on load prediction, and relates to the technical field of automobile electrical control, and the method comprises the following steps: injecting a micro-amplitude identification pulse into a whole vehicle electrical system, capturing the dynamic response of an electrical load, building a load transition curvature map, marking a high-risk time window, and generating a buffer time slot; and in the buffer time slot, constructing a prediction model fusing time domain extrapolation calculation and frequency domain envelope regression, and outputting collaborative confidence with credibility. A load transition curvature map is constructed to identify a high-risk window, a time domain and a frequency domain are fused to predict output confidence, excitation current is guided to form an anti-shake track, and a dynamic adjustment path is generated by combining start-stop broadening of high-power equipment and voltage second-order derivative identification. And finally, a slew rate self-adaptive strategy is introduced at a chip end to reduce peak impact, power supply and chip cooperative protection is realized, and system robustness and intelligent driving electrical safety are improved.

The invention provides an energy management strategy verification platform for a plug-in series hybrid power ship propulsion system. The energy management strategy verification platform comprises a power source module, a power output module, a load simulation module, a transmission module, a sensor measurement module and a control system module, the power source module outputs electric energy through multi-energy cooperation; the power output module generates propelling power according to the electric energy; the load simulation module simulates load characteristics according to the propulsion power; the transmission module is connected with the power source module and the power output module as well as the power output module and the load simulation module; the sensor measurement module collects operation parameters of the verification platform; and the control system module executes an energy management strategy according to the operation parameters and outputs a control instruction. A graphical programming environment is constructed by adopting a modeling code automatic generation system, and a strategy rapid prototype development verification closed loop is formed in combination with a range extender intelligent start-stop control strategy and a multi-mode power generation control strategy.

The invention relates to the technical field of converters, in particular to a three-phase converter control method and system, a medium and equipment. The method comprises the steps that a main processor transmits sampling original data of a three-phase converter to a first storage area; the coprocessor reads the sampled original data, performs operation to obtain operation result data, and transmits the operation result data to the second storage area; the coprocessor runs at a period higher than the preset control frequency of the main processor, and immediately triggers the operation of the sampled original data after completing the collection of the sampled original data; the main processor performs control loop calculation, reads the operation result data when the newest operation result data is needed, and loads the newest operation result data for updating operation; the main processor runs the control program at the preset control frequency, and the control program triggering time is set in a minimum allowable time window before the control output quantity loading moment. Through the above arrangement, real-time sampling is effectively realized, CPU load is optimized, and the control performance of the converter is improved.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

The invention relates to a starting and power generation integrated control method based on externally distributed bosses of a permanent magnet motor, and the method comprises the following steps: determining the initial position of a rotor of the permanent magnet motor relative to a stator through a pulse voltage injection method, and applying a drive signal to a stator coil, so that the motor reaches the rotating speed at which an ignition trigger can stably detect the signal; an ignition trigger is used for obtaining boss signals and conducting shaping processing, and the specific position of the rotor relative to the stator is determined; the stator coil is electrified by utilizing the relative position of the rotor and the stator, the motor is driven to rotate, and flux-weakening voltage regulation control is carried out; and when the power-assisted condition is met, a stator coil corresponding to the permanent magnet motor is electrified by utilizing the relative position of the rotor and the stator, so that switching control from power generation voltage regulation to power-assisted driving of the motor is realized, and power-assisted driving operation is executed. According to the control method, the boss on the rotor is used for starting and power generation voltage regulation control of the permanent magnet motor, and the method is simple and easy to implement.

The invention discloses a multi-frequency subsynchronous oscillation self-adaptive suppression method for a doubly-fed wind power generation system, and belongs to the technical field of power system stability control. The invention aims to solve the problem that an existing method only suppresses single oscillation frequency and cannot guarantee stable operation of a wind turbine generator and a power grid. Comprising the steps that discrete current signals of the double-fed wind power generation system are collected, a sparse Fourier observer is used for sequentially conducting frequency spectrum rearrangement, window function filtering, frequency domain down-sampling and fast Fourier transformation, positioning circulation and valuation circulation on the discrete current signals, and the frequency and amplitude of subsynchronous oscillation components of the double-fed wind power generation system are obtained; a parallel multi-frequency self-adaptive wave trap is connected into a rotor side converter control loop of the doubly-fed wind power generation system, parameters of the wave trap are dynamically adjusted, and a suppression signal opposite to a subsynchronous oscillation component is output to filter out the subsynchronous oscillation component. According to the invention, the subsynchronous oscillation of the power system can be effectively suppressed under the condition of high-proportion new energy access.

The invention discloses a current compensation type three-vector model prediction control method for an off-grid doubly-fed wind turbine generator, belongs to the technical field of doubly-fed wind turbine generator control, and aims to solve the problems of voltage sag and high total harmonic distortion rate of a micro-grid system caused by sudden load change during off-grid operation of the doubly-fed wind turbine generator. The control method comprises the steps that on the basis of virtual synchronous networking control, an off-grid doubly-fed wind turbine generator rotor current prediction model is established, load current, stator side converter current and stator voltage are introduced into three-vector model prediction control, and the voltage coupling effect and current change caused by load abrupt change are compensated in real time, so that the rotor current of the off-grid doubly-fed wind turbine generator is predicted. Obtaining a compensated rotor current reference; a cost function is designed by taking the minimum prediction error of the rotor current as a target, so that accurate prediction of the rotor current during sudden load change is realized, a voltage sag phenomenon caused by sudden load change is effectively inhibited, the harmonic content of output voltage is reduced, and meanwhile, quick response to system frequency and load power is realized.

The invention relates to an inertia synchronization PMSG self-adaptive control method based on online impedance estimation, and belongs to the field of new energy grid connection. The method comprises the following steps: S1, constructing an RLS-GA hybrid strategy algorithm to quickly and accurately identify power grid impedance, and determining the strength type of a power grid; s2, establishing a direct-drive fan grid-connected system control strategy, and adopting a power control ring, a current control ring and an inertia transmission control ring at a machine side; the grid side adopts a direct-current voltage synchronous loop, a reactive voltage control loop and a stabilization control loop; s3, linearizing the control equation, and based on a linearized small signal equation, obtaining a state variable of the direct-current voltage synchronous control grid-connected system of the grid-forming type direct-driven wind turbine generator; s4, calculating control parameters of a reactive voltage control loop and a direct-current voltage synchronous loop; and S5, carrying out adaptive parameter setting on an existing permanent magnet fan inertia synchronization strategy so as to adapt to the change of strong and weak power grids and improve the stability performance of the PMSG under different power grid short circuit ratios.

The invention discloses an AC excitation system no-load voltage buildup and pre-synchronization grid-connected control method and system, and the method comprises the steps: obtaining the amplitude and phase of a power grid voltage in real time through a phase-locked loop when the rotating speed of a doubly-fed induction motor reaches a synchronous rotating speed range; detecting the mechanical position of the rotor by using an encoder and calculating a slip angle; carrying out fundamental component extraction and phase correction on the stator side no-load voltage; setting a stator voltage target value based on power grid voltage directional control and calculating target rotor current; constructing a rotor current inner loop control loop, calculating a feedforward decoupling item and performing phase compensation; superposing a stator voltage outer loop control loop, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator side no-load voltage and the power grid voltage; and when a preset synchronization condition is satisfied, closing the grid-connected circuit breaker and switching a control mode. Accurate no-load voltage buildup and smooth pre-synchronization grid connection of the excitation system are achieved through a double closed-loop control structure, and the stability and reliability of the grid connection process are improved.

The invention provides an active and reactive decoupling control method for a double-shaft excitation synchronous generator, and the method comprises the steps: building a mathematical model of the double-shaft excitation synchronous generator in a dq0 coordinate system, and determining the corresponding control relation between active power and q-axis excitation current, and between reactive power and d-axis excitation current; active power adjustment: keeping the d-axis exciting current constant, adjusting the magnitude of the q-axis exciting current, realizing continuous adjustment of the active power, and controlling the reactive power to fluctuate within a preset range; adjusting reactive power, keeping q-axis exciting current constant, adjusting d-axis exciting current, adjusting reactive power between an absorption state and an emission state, and controlling active power to fluctuate within a preset range; performing dynamic compensation adjustment; according to the method, the dq0 coordinate system mathematical model is established, the active-q-axis current and reactive-d-axis current incidence relation is defined, active / reactive precise decoupling adjustment is achieved, the output voltage is kept stable when the load changes, and the requirement of a complex power grid for power control is met.

The invention relates to the technical field of flexible interconnection power distribution networks, and discloses a frequency support control system of a doubly-fed wind turbine generator connected into a flexible interconnection power distribution network and a control method of the frequency support control system. A virtual synchronous frequency support is embedded in the doubly-fed wind turbine generator, and a fuzzy controller based on frequency deviation and change rate is introduced to realize optimization of inertia and a primary frequency modulation coefficient; the system structure can actively support the connected flexible interconnection power distribution network; according to the method, the inertia response coefficient and the primary frequency modulation coefficient can be dynamically adjusted in real time according to the system operation state, and the frequency fluctuation problem caused by the distributed power supply is solved; the inertia response coefficient and the primary frequency modulation coefficient are dynamically adjusted in real time according to the operation state of the flexible interconnection power distribution network, and it is still ensured that the doubly-fed wind turbine generator has good frequency supporting performance under the condition of wind speed fluctuation.

The application discloses a superconducting synchronous phase modifier excitation power supply device, which comprises a three-phase rectifying device, an adjusting module, a protection module and a digital control module, wherein the three-phase rectifying device is used for providing a bus side DC voltage; the adjusting module is used for adjusting an excitation total current; the protection module is used for ensuring safe operation of the device; and the digital control module is used for realizing high-precision continuous adjustment of excitation winding voltage and current. The superconducting synchronous phase modifier excitation power supply device solves the problem of unbalanced reactive output of the superconducting synchronous phase modifier caused by large excitation current ripple, and improves the reliability of the superconducting synchronous phase modifier.

The application relates to the technical field of electric vehicles, and discloses an electric vehicle range extender amplifier control system and method based on reinforcement learning, the electric vehicle range extender amplifier control system based on reinforcement learning comprises the following steps: acquiring a forward traction demand power and a battery efficiency; calculating an excitation drag energy density; calculating a target range extender power; calculating a target engine rotating speed; calculating a target excitation current; and issuing a command to a power amplifier control. The application identifies the energy source difference in the power output process by constructing the excitation drag energy density feature, provides a decision basis for the range extender control which is in line with the actual energy supply state, synchronously completes the range extender energy supply distribution and excitation adjustment constraint through reinforcement learning, combines the engine rotating speed pre-compensation and the flux suppression logic, reduces the power distortion caused by the rotor kinetic energy release and the battery short-time compensation, and adapts to the daily operation scene demand of the range extender electric vehicle.

The invention relates to a method for controlling an electrical generator of a wind turbine, the generator having a rotor and a stator, the stator being controlled by means of a stator current, the stator current having a main component being characterized by a fundamental signal with a fundamental frequency and a fundamental phase angle and a fractional harmonic current component being characterized by a fractional harmonic signal having a fractional harmonic frequency and a fractional harmonic phase angle, comprising the steps providing a compensation current having a compensation amplitude and a compensation phase angle, and determining the compensation phase angle depending on an absolute rotational position of the rotor.

The present application relates to the technical field of automobile control, and particularly relates to a magnet exciting coil power supply control method, a control circuit and a device for a magnet exciting generator. The control method comprises the following steps: S1: after the system is powered on, whether the engine starts to start or the magnet exciting generator starts to rotate is detected in real time; S2: after it is detected that the engine starts to normally start or the magnet exciting generator starts to normally rotate, a set current is output to the magnet exciting coil by controlling the magnet exciting power supply circuit; and S3: after the engine starts, the feedback voltage of the magnet exciting coil is detected in real time, and when the feedback voltage is not less than a set voltage, the power supply current is turned off, and the magnet exciting generator enters a self-power supply stage of the magnet exciting coil. In the method, the magnet exciting coil is powered after it is detected that the engine starts to start, at this time, the magnet exciting generator starts to work, the power generation voltage can be established immediately, the self-power supply is performed, the heating and burning of the current limiting resistor of the power supply circuit are avoided, and the battery power loss caused by the power supply circuit power supply to the battery power when the engine is not started is avoided.

The invention discloses an energy storage type phase modifier with a damping structure and a system, and belongs to the technical field of electric power equipment. The brush doubly-fed motor comprises a stator and a rotor. An air gap is formed between the stator and the rotor; three-phase symmetrical windings are arranged in the stator and the rotor; the damping structure is made of an electric conductor material and is arranged along the circumference of the notch of the rotor; the damping structure can be equivalent to a three-phase winding, and in the equivalent three-phase winding of the damping structure, each phase is self-short-circuited. The damping structure optionally comprises at least one of the following structures: a slot wedge made of an electric conductor, a cage bar and an end ring. According to the invention, the energy storage type phase modifier has the capabilities of suppressing the excitation current peak value and improving the short-circuit current on the premise of ensuring the high inertia supporting function, so that an excitation system is effectively protected, and the short-circuit voltage supporting capability of the motor is enhanced.

This invention discloses a method and system for no-load voltage build-up and pre-synchronization grid connection control of an AC excitation system. The method includes: acquiring the amplitude and phase of the grid voltage in real time via a phase-locked loop when the speed of the doubly-fed induction motor reaches the synchronous speed range; detecting the rotor mechanical position and calculating the slip angle using an encoder; extracting the fundamental component and correcting the phase of the stator-side no-load voltage; setting a target value for the stator voltage based on grid voltage-oriented control and calculating the target rotor current; constructing an inner-loop control loop for the rotor current, calculating the feedforward decoupling term and performing phase compensation; superimposing an outer-loop control loop for the stator voltage, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator-side no-load voltage and the grid voltage; and closing the grid connection circuit breaker and switching the control mode when the preset synchronization conditions are met. The dual-closed-loop control structure achieves precise no-load voltage build-up and smooth pre-synchronization grid connection of the excitation system, improving the stability and reliability of the grid connection process.

The embodiment of the invention provides a unit excitation de-excitation system and method, and the system comprises a controller which is used for controlling the trigger angle of a three-phase full-control bridge to be switched from a rectification state to an inversion state during normal shutdown so as to achieve inversion de-excitation, and recognizing a fault signal and triggering a de-excitation switch during accidental shutdown; the three-phase full-control bridge is electrically connected to an excitation winding of the generator and is configured to provide rectification or inversion voltage under the control of the controller; the field suppression switch is connected in series in the excitation loop and is configured to respond to a signal of the controller to disconnect the excitation loop during accidental shutdown; the non-linear resistor is connected to the excitation winding in parallel and is configured to absorb residual energy in the rotor when the field suppression switch is switched off; and the protection device is configured to monitor the excitation current and voltage in real time and trigger a protection action when an abnormality is detected. Energy waste of traditional resistor de-excitation is avoided, reliable de-excitation can still be ensured under the extreme fault condition, and the rotor is prevented from being damaged due to overheating.

The application discloses an efficiency optimization method of an electrically excited doubly salient wind power generator, and belongs to the technical field of motor control, and the technical scheme is as follows: step S1: a field-circuit combined simulation software Maxwell-Simplorer is used to establish a coupling model of a magnetic field and an electric field of an electrically excited doubly salient wind power generator system; step S2: loss distribution characteristics under different rotating speeds, load working conditions and conduction angles are obtained; step S3: a particle swarm optimization algorithm PSO is used to optimize a neural network BP, and loss data of the electrically excited doubly salient wind power generator system is trained; and step S4: the optimal conduction angle obtained in step S3 is applied to control of the electrically excited doubly salient wind power generator system. The application can obtain the optimal conduction angle in a wide rotating speed load range, realizes loss optimization of the motor, and improves the system efficiency.

The invention discloses an excitation system modeling test data speculation method and device, and relates to the field of data speculation, and the method comprises the steps: obtaining actually measured generator no-load characteristic test data; judging whether the no-load characteristic test data of the generator lacks excitation current corresponding to the percentage of the terminal voltage of the high-voltage section or not; if not, excitation system modeling is carried out based on generator no-load characteristic test data; if the excitation current does not exist, the excitation current corresponding to the percentage of the terminal voltage of the high-voltage section is speculated based on a pre-constructed nonlinear fitting function; and carrying out generator excitation system modeling on the excitation system by using generator no-load characteristic test data and the excitation current corresponding to the speculated generator terminal voltage percentage of the high-voltage section. And when the input data does not lack the high-voltage section data, the original data is directly used, so that unnecessary fitting is avoided. When the high-voltage section data is lacked, the data is speculated through the pre-constructed nonlinear fitting function, the principle is simple, and the data acquisition efficiency is improved.

The invention relates to the technical field of hydroelectric generating set adjusting system power control, in particular to a hydroelectric generating set adjusting system optimal LQR power control method based on an improved dogvessel squirt algorithm, which comprises the following steps of: establishing a full-link state space model covering a water delivery system, a water turbine, a generator, an excitation system and a power grid; the hydraulic-mechanical-electromagnetic-power grid coupling dynamic state is accurately reflected; a state weighting matrix and a control weighting matrix of a linear quadratic regulator LQR are optimized based on an improved dogvessel squirt algorithm, and the bottleneck of traditional manual trial and error is broken through; and solving the algebraic Riccati equation to obtain an optimal feedback gain, and generating a control law to act on the speed regulator. Simulation verification shows that compared with traditional PID control, the method has the advantages that under step load disturbance and random power fluctuation, power angle and rotating speed oscillation can be remarkably restrained, volute water pressure impact can be weakened, the power tracking speed can be increased, the dynamic adjusting performance and robustness of the system can be improved, and the method is suitable for complex power grid operation conditions.

The invention belongs to the technical field of power generation equipment, and particularly relates to a brush excitation generator collecting ring protection device which comprises a box body and a controller. The box body comprises an outer housing, a temperature and humidity sensor and an air dryer; the temperature and humidity sensor and the air dryer are mounted in the outer housing; the temperature and humidity sensor and the air dryer are connected with the controller, the temperature and humidity sensor is used for monitoring and collecting environment temperature and humidity data in the outer housing in real time, generating temperature and humidity data and sending the temperature and humidity data to the controller, and the controller conducts digital-to-analog conversion processing on the temperature and humidity data, generating temperature and humidity measured values and sending the temperature and humidity measured values to the air dryer. And comparing and judging the temperature and humidity measured value with the temperature and humidity set value, generating an air dryer operation instruction or a stop instruction according to a comparison and judgment result, and controlling the air dryer to start or stop. According to the device, the humidity in the outer cover shell is controlled, a closed box body is formed, erosion of water vapor in the external environment to the collecting ring is effectively prevented, and the use effect is good.