809results about "Generator control by field variation" patented technology

The invention relates to a dual three-phase permanent magnet synchronous generator rectification system and a direct current voltage stabilization control method thereof. Comprising a dual three-phase permanent magnet synchronous generator, a VSD decoupling converter, a load current observer, a dynamic load feed-forward compensator, a voltage closed-loop controller, a dead-beat predictive current controller, a maximum four-vector SVPWM modulation module and a six-phase rectifier. The double-three-phase topological structure adopted by the invention has the advantages of multiple control degrees of freedom, high reliability and the like. A dynamic load feed-forward compensator is constructed to perform dynamic feed-forward compensation on quadrature-axis current of the motor, so that the recovery time of bus voltage is shortened, and the voltage fluctuation amplitude is reduced; the designed dead-beat predictive current controller optimizes the dynamic characteristics of a current loop, improves the torque tracking performance of the motor, and further improves the voltage stabilization regulation capability of the system. The designed load current observer realizes the analysis redundancy of current detection and improves the reliability of the system.

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.

The invention provides an electrical automation control system and method. The method comprises the steps that multi-source heterogeneous data in the operation process of a wind driven generator is collected; performing feature coupling processing on the multi-source heterogeneous data to obtain dynamic association features among different state parameters during power generation of the motor rotor; determining stability margins of different control loops in the wind driven generator based on the time-varying characteristic of each dynamic correlation characteristic, and performing cooperative compensation on each control signal in the wind driven generator based on all the stability margins to obtain a multi-stage compensation control signal of the wind driven generator; according to the interference gradient determined by the multi-source heterogeneous data, the cooperation coefficient of each compensation control signal in the multi-stage compensation control signals is adjusted; and performing cooperative control on each control loop based on the multi-stage compensation control signal and the adjusted cooperative coefficient of each compensation control signal. According to the scheme provided by the invention, different control loops in the wind driven generator can be cooperatively controlled under the influence of the dynamic coupling relationship of the different control loops.

The invention relates to the technical field of vehicle control, and provides an ultralow-temperature power generation control method and system for an extended-range vehicle. Comprising the following steps: acquiring a driving power consumption predicted value, an accessory power consumption predicted value and a battery discharge power predicted value under the condition that the temperature of a power battery cell is lower than a preset temperature threshold value; performing a feedforward operation based on the driving power consumption prediction value, the accessory power consumption prediction value, and the battery discharge power prediction value to generate a first generator torque; the actual consumed power and the actual generated power of the vehicle are obtained; pID operation is carried out based on the difference value between the actual consumed power and the actual generated power, and a second generator torque is generated; superposing the first generator torque and the second generator torque to generate a generator target torque; and controlling the generator to execute the generator target torque. The generated power and the consumed power are dynamically balanced, and the rapid maneuvering capability of the vehicle under the ultralow temperature condition is achieved.

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 relates to a fault current analysis method based on first-order Taylor expansion, and the method comprises the following steps: 1, determining a system control strategy which is a network construction type control strategy and comprises a power loop, a virtual impedance link and a voltage and current loop; the power loop comprises an active power control loop and a reactive power control loop; 2, constructing a differential algebraic equation set model capable of representing the dynamic state of the system; 3, according to the characteristic that the integral value does not suddenly change at the moment before and after the fault occurs, the steady state before the fault is utilized to solve and obtain an instant state variable value after the fault, and then an instant dq-axis current value after the fault and an instant current amplitude value after the fault are obtained; 4, performing first-order Taylor expansion on the constructed differential algebraic equation set at the solved post-fault instant state variable value and the dq-axis current value, and converting a nonlinear differential algebraic equation set model into a linear differential algebraic equation set; and 5, analyzing the fault current.

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 an adaptive power control method for a duplex-winding induction generator system, and belongs to the technical field of generator control. The double-winding induction generator system is composed of a double-winding induction generator, an energy storage unit, a static excitation converter and a diesel engine. According to the self-adaptive power control method, control winding current is decoupled into excitation control and electromagnetic torque control through coordinate transformation based on rotor flux linkage orientation, independent adjustment of output power of the generator is achieved, passive regulation and control of power of an energy storage unit are achieved through control of electromagnetic torque of the generator, and the self-adaptive power control method is achieved. The problem that the control freedom degree of a single converter system is insufficient is solved. Besides, according to the control method adopted by the invention, a dynamic planning-based generator / energy storage unit power distribution strategy with minimum fuel loss as a target is adopted, so that the generator is ensured to always work in a high-efficiency interval of the diesel engine within a wide load change range, and the power generation cost is remarkably reduced.

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 DFIG grid-side converter control parameter multi-target step-by-step identification method based on RT-LAB, and belongs to the technical field of doubly-fed induction generator grid-side converter control. The method comprises the steps that a DFIG grid-side converter identification model is built, an off-line model is created through MATLAB / Simulink, an RT-LAB platform is embedded, subsystems are divided, and a synchronous communication module is added; feature selection and importance evaluation are carried out, and LASSO regression is adopted to screen key features; analyzing the correlation degree through a Spearman grade correlation coefficient, and determining a high-correlation-degree observed quantity and a step-by-step identification sequence; and establishing a multi-objective optimization model by using an MOEA / D algorithm based on the screening result, and processing a plurality of optimization objectives to find an optimal tradeoff solution. According to the DFIG grid-side converter control parameter multi-target step-by-step identification method based on RT-LAB, the defects of a traditional method are overcome, the accuracy of the control parameters is improved, the system stability and reliability are enhanced, the cost and risk are reduced, the energy utilization efficiency is improved, and powerful support is provided for efficient operation of a power generation system.

The invention discloses a virtual synchronous generator pre-synchronization control method based on adaptive virtual torque compensation. The method comprises the following steps: establishing a control equation of a virtual generator of an energy storage converter; self-adaptive virtual torque and self-adaptive virtual electromotive force compensation quantity are added into the virtual synchronous generator control equation, and an improved virtual synchronous generator control equation based on self-adaptive virtual torque compensation is obtained; calculating to obtain the compensation amount of the adaptive virtual torque and the adaptive virtual electromotive force; in the off-grid mode, the output voltage of the energy storage converter and the voltage of the power grid are input into the self-adaptive virtual torque compensation controller, the compensation amount of the self-adaptive virtual torque and the compensation amount of the self-adaptive virtual electromotive force are output and compensated to a virtual synchronous generator control equation of the energy storage converter, and therefore synchronization of the voltage of the power grid is achieved. The output voltage amplitude and the voltage phase of the converter can be quickly adjusted only by collecting the output voltage of the converter and the voltage of the power grid, and the effect of smooth grid connection of the converter is achieved.

A wind power plant is provided, including: one or more generator devices for generating electrical power from wind power; a plurality of hydrogen production units for producing hydrogen from the generated electrical power; a plurality of DC-DC converters each being electrically connected with the one or more generator devices and with a respective one of the plurality of hydrogen production units, and each DC-DC converter being configured for supplying power with a tunable output voltage to the respective hydrogen production unit; and a control device for controlling the power supplied by each DC-DC converter to the respective hydrogen production unit based on a current power output of the one or more generator devices. With the proposed wind turbine plant the supply of power to the plurality of hydrogen production units can be improved.

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 discloses an AC excitation system self-starting control method and system, and the method comprises the steps: obtaining a rotor current rotation frequency and an actual rotor rotation frequency, and generating a slip frequency; the slip frequency is compared with a preset dynamic threshold value, and the rotating speed given value is dynamically adjusted; inquiring a preset multi-stage sectional type current control curve according to the actual rotor rotation frequency, and outputting a d-axis current given value; pI adjustment is carried out based on the slip frequency to generate a q-axis current given value, and corresponding preset current threshold limit is applied according to the frequency band where the actual rotor rotation frequency is located; performing independent parameter configuration on the magnetic flux current control loop and the torque current control loop by adopting a non-coupling parameter setting algorithm; and in the unit starting process, under the condition that the stable starting constraint condition is met, an optimal starting parameter combination is generated. According to the invention, by dynamically adjusting the rotating speed given value and controlling the current in a segmented manner, the stable self-starting of the alternating current excitation system is realized, and the reliability and efficiency of the starting process are improved.

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 invention discloses an energy storage balance wind power generation control system, and belongs to the technical field of energy storage and power supply, the energy storage balance wind power generation control system is provided with an energy storage adjusting structure and a speed reduction structure, the energy storage adjusting structure comprises a transformer T, and an adjustable slide rheostat is arranged between each phase input end of the transformer T and each phase output end of an alternating current generator; by automatically adjusting the resistance value of the slide rheostat, the voltage of each phase input end of the transformer T is automatically stabilized. The speed reduction structure comprises a cabin, a rotating shaft is arranged in the cabin, one end of the rotating shaft is fixedly connected with blades, the other end of the rotating shaft is fixedly connected with an alternating current generator, a rotating disc is fixedly connected to the surface of the rotating shaft, a rotating disc groove is formed in the rotating disc, and a weight block is arranged in the rotating disc groove. The arc-shaped block is arranged on the surface of the weight block and abuts against the inner wall of the cabin, so that the rotating speed of the rotating shaft and the blades is reduced, the voltage generated by the alternating-current generator is more stable, and the voltage balance when wind power generation is merged into a municipal power grid is improved.

The invention discloses a multi-strategy collaborative broadband oscillation uniform suppression method for a wind power flexible low-frequency grid-connected system. The method comprises the following steps: 1, establishing a wind power flexible low-frequency grid-connected system state space model under different installation positions and different broadband oscillation suppression strategies; 2, a broadband oscillation suppression strategy installation position under non-target frequency band damping constraint is obtained; and 3, selecting a multi-strategy collaborative broadband oscillation uniform suppression strategy type. The invention provides a multi-strategy collaborative broadband oscillation uniform suppression strategy by considering the problems that non-target frequency band damping is possibly deteriorated and the system is unstable while the target frequency band damping of a wind power flexible low-frequency grid-connected system is improved by the broadband oscillation suppression strategy. After the broadband oscillation suppression strategy is added, any frequency band has uniform positive damping, the stability margin of the wind power flexible low-frequency grid-connected system is improved from the broadband range, and the problem of system instability caused by non-target frequency band damping deterioration is avoided.

The invention discloses a double-fed fan decoupling control method and device based on dynamic feed-forward compensation, and belongs to the technical field of wind power generation. When the power grid frequency deviation in unit time and the power grid frequency change rate meet a first preset condition, starting an active compensation ring; and when the grid-connected point voltage deviation and the grid-connected point voltage change rate in unit time meet a second preset condition and the power grid frequency deviation and the power grid frequency change rate in unit time do not meet the first preset condition, starting a reactive compensation ring. According to the invention, adaptive control in consideration of the load sudden change degree and the system response capability is added, so that the power coupling rate can be greatly reduced, and adaptive frequency voltage decoupling support can be carried out on different load sudden change degrees; the problem of frequency and voltage stability caused by errors of the PLL under the condition that the doubly-fed fan is connected with a weak power grid is effectively relieved.

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 discloses a negative sequence control-based control method for a grid-side converter of a grid-forming type permanent magnet synchronous motor, and relates to the technical field of virtual synchronous machine control. According to the method, permanent magnet synchronous motor network side control under the unbalanced weak power grid condition is divided into network construction type control, positive sequence double-closed-loop control and negative sequence closed-loop control, cooperative compensation control is added to the positive sequence double-closed-loop control, and corresponding positive sequence voltage and current components are compensated according to the power grid unbalance degree. Aiming at the problem that the existing permanent magnet synchronous motor control technology is difficult to realize stable operation under the unbalanced weak power grid, a negative sequence control mode is combined with a network construction mode, a cooperative compensation control mode is added, a negative sequence current component can be effectively inhibited, the stability of the permanent magnet synchronous motor under the unbalanced weak power grid is greatly improved, and the stability of the permanent magnet synchronous motor under the unbalanced weak power grid is improved. And stable operation under a severe power grid condition is realized.

The invention discloses a transient reactive characteristic modeling method for a flexible excitation system under a power grid voltage fault, and the structure and a control block diagram of the system meet the following requirements: a synchronous generator is connected with a three-phase voltage source type converter, the three-phase voltage source type converter is connected with a chopping converter, the chopping converter outputs excitation voltage according to a system control signal, and the excitation voltage is converted into the excitation voltage. Therefore, excitation current is provided for the synchronous machine. The modeling process comprises the following steps: analyzing a synchronous machine equivalent diagram and an AVR control block diagram in the flexible excitation system so as to establish a corresponding mathematical model; then voltage and current parameters of a synchronous machine end of the system in a steady state before a fault are calculated; the transient current caused by the stator voltage change and the excitation voltage change is further solved respectively; and finally, the transient reactive power of the synchronous machine side of the flexible excitation system is obtained. The method provides a theoretical basis for realizing dynamic strong excitation control of the flexible excitation system and improving the stability of the system under a transient condition.

The invention relates to a wireless power transmission-based synchronous motor excitation system for an aero-engine, which belongs to the technical field of wireless power transmission synchronous motor excitation, and comprises a power supply, an inversion module, a metal eddy current resonance compensation network, a passive rectification module and an excitation module, on one hand, a synchronous motor excitation system suitable for wireless electric energy transmission of an engine rotating part is designed and arranged in an aero-engine, power transmission from a power source to a load can be completed without physical connection, the reliability problem of friction of a contact structure is solved, and the structure is simple; on the other hand, a metal eddy current resonance compensation network is introduced into a coupling mechanism of a transmitting end coil and a receiving end coil for wireless electric energy transmission, so that the excitation system of the synchronous motor is in a resonance state, and the compensation inductance and capacitance of the aero-engine under the consideration of the metal eddy current influence can be obtained; and resonance compensation under the influence of the metal eddy current is further realized.

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 relates to a variable-speed pumped storage group power system low-frequency oscillation self-adaptive control method, and relates to the field of power control, and the method comprises the steps: processing power system operation data and energy storage group power generation monitoring power through a mode recognizer, and outputting a first low-frequency oscillation mode; when the mode belongs to the low-frequency abnormal oscillation mode, a water turbine mechanical energy prediction network is called, a mode recognizer is combined, an optimization algorithm is executed on unit control parameters, and the recommended unit guide vane opening degree, the recommended unit operation frequency and the recommended unit rotation speed set point are obtained; controlling a water turbine according to the recommended unit guide vane opening and the recommended unit operation frequency, and controlling an alternating current excitation device according to the recommended unit rotation speed set point. The technical problem that in the prior art, low-frequency oscillation control is achieved depending on adjustment of physical components, and consequently adaptability is poor is solved.

The invention discloses an excitation system dynamic characteristic analysis method and system, and the method comprises the steps: reading wave recording file data of an excitation system, extracting original data containing analog quantity data and timestamp information, carrying out the classification of the original data, and generating a configuration file and a data file which meet the COMTRADE standard; performing dynamic characteristic parameter calculation on the classified and sorted original data, wherein dynamic characteristic parameters comprise quantitative calculation of overshoot, adjustment time, oscillation times, de-excitation time, excitation time and over-excitation inverse time limit; the method comprises the following steps: establishing a preset threshold value of a dynamic characteristic parameter, comparing a calculation result with the preset threshold value, generating a PID parameter adjustment instruction, an inversion failure alarm signal or an excitation control optimization strategy according to an over-limit parameter type, and comparing dynamic parameter calculation with the threshold value so as to identify a fault reason and generate an optimization instruction. The problem of low efficiency caused by the fact that traditional fault recognition depends on artificial experience is solved, and the method has the advantages of improving fault analysis efficiency and improving safety of a power system.