394results about "Synchronous generator control" patented technology

Limiting generator loads in a wind turbine having a power converter with a line side inverter configured as a grid forming inverter. A maximum grid current value is determined based on a measured generator load and a limit function. A virtual impedance value and a virtual voltage drop over the virtual impedance value are determined. A virtual synchronous machine angle is determined based on a power reference and the virtual grid power. The voltage reference for controlling the line side inverter is determined based on the virtual synchronous machine angle, the virtual voltage drop and the voltage magnitude reference.

The invention discloses a sensorless control method for a high-speed low-carrier-ratio permanent magnet synchronous generator. The method comprises the following steps: firstly, building a double-loop control system of a controlled permanent magnet synchronous generator comprising a current inner loop and a bus voltage outer loop under the condition of high speed and low carrier wave ratio, selecting an MRAS control strategy as a sensorless control strategy, introducing the MRAS control strategy into the double-loop control system, adjusting parameters of the MRAS control strategy, and controlling the current inner loop and the bus voltage outer loop of the controlled permanent magnet synchronous generator; the double-loop control system is enabled to operate stably; and designing parameters of a controller of the LADRC, and replacing all PI control in a double-loop control system with the LADRC to obtain the sensorless control method of the high-speed low-carrier-ratio permanent magnet synchronous generator based on the LADRC and the MRAS. According to the method, constraint conditions such as high rotating speed, low carrier wave ratio and sensorless control are comprehensively considered, the motor control model when the permanent magnet synchronous motor is used as the generator is constructed, parameter design is carried out in combination with PI control, and a more economical and feasible solution is provided.

A technical field of motor control, and a motor rotation control method and device. The method includes conducting inverse Park transformation and inverse Clark transformation to control output results of a position loop, a speed loop and a current loop to obtain SVPWM signals of a present cycle; decoupling an interrupt control cycle from a PWM signal reference channel; acquiring present position sampling information of a motor, and predicting the position sampling information to obtain position result information of a motor rotor in predicted cycles. In the motor rotation control method, an interrupt function trigger signal is added to realize decoupling from the PWM signal reference channel, so that SVPWM signal update frequency of motor control will not be affected when CPU load is reduced by adding an interrupt function scheduling cycle.

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.

The present invention discloses a charging and discharging control method and system for an electric vehicle based on virtual synchronization, and relates to the technical field of virtual synchronization. The method includes: establishing connection between a power grid and the electric vehicle, and acquiring a charging and discharging operation demand; acquiring, according to the charging and discharging operation demand, a corresponding control instruction and constraint condition, and executing a charging and discharging operation; and providing a human-computer interaction interface for measuring and settling charging and discharging energy, along with authentication. The present invention achieves efficient and coordinated charging and discharging control, precise measurement and convenient authentication, and improves availability and reliability of the system.

The invention provides a wind generating set, a differential speed regulation device and a control method thereof, the wind generating set comprises the differential speed regulation device, a multi-port converter and an electro-magnetic synchronous generator, and the differential speed regulation device comprises a permanent magnet motor, a differential planetary gear train, a quasi planetary gear train and a speed regulation motor. A permanent magnet motor rotor is connected with a differential planetary gear train planet carrier, and a speed regulating motor rotor is connected with a quasi planetary gear train sun gear. The differential planetary gear train sun gear drives the electro-magnetic synchronous generator rotor to operate at a first preset rotating speed. One port of the multi-port converter is connected with the permanent magnet motor stator, one port is connected with the speed regulation motor stator, and the other port is connected with the electro-magnetic synchronous generator rotor through the slip ring. According to the differential speed regulation device, variable-speed input, self-energized speed regulation and constant-speed output are achieved, and the differential speed regulation device is compact in overall structure, small in size and light in weight; the black start can be realized without taking power from a power grid; and the electro-magnetic synchronous generator is directly connected to the grid, so that the power grid supporting capacity is high.

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 a three-level power generation system multi-step prediction control method based on rolling time domain estimation. The method comprises the following steps: establishing a mathematical model under a new topology based on a three-level structure adopted by a machine-side converter and a network-side converter; discretizing the model; sampling current, voltage and speed and performing coordinate transformation; designing an outer ring model prediction speed controller; designing an inner ring model prediction current controller; selecting an optimal voltage vector enabling the cost function value to be minimum according to the constructed cost function; the dq-axis observer is used for estimating dq-axis disturbance information of the system, so that the designed current loop controller has relatively strong suppression on parameter mismatching; estimating state information of the system and disturbance information involved in each step of multi-step prediction by means of a differential GPIO observer, and constructing a new state space model; according to the method, the problem of large calculation amount is solved, and the anti-interference performance of the system is effectively enhanced.

The invention provides a self-adaptive state prediction control method for improving the stability of a grid-forming type new energy shafting, and belongs to the technical field of wind power generation, and the method comprises the steps: determining an extended state observer based on a nonlinear function and a closed-loop system; obtaining a virtual torque compensation item by using the extended state observer, and feeding back the virtual torque compensation item to a virtual rotor motion equation of the virtual synchronous machine to perform additional power compensation; in the additional power compensation process, when the rotating speed of the draught fan is lower than a preset safety value, proportional integral differential control is set to zero through a rotating speed protection module, the wind power virtual synchronous machine system is controlled to exit additional power compensation, and the active supporting system is controlled to operate stably; in the stable operation process of the active support system, the rotating speed of the fan is recovered to the optimal value through the rotating speed recovery module, and the influence caused by unreasonable parameters is reduced and the dynamic stability of the wind power VSG grid-connected system is effectively enhanced by estimating the imbalance between the external disturbance power and the internal state quantity and performing tracking compensation in the controller.

The invention discloses a wind power plant equivalent virtual inertia identification method based on symbol regression, and relates to the technical field of novel power system frequency safety and stability, and the method comprises the steps: S1, building a doubly-fed fan inertia response dynamic mechanism model containing comprehensive inertia control; according to the method, the problems of lack of physical mechanisms, poor evaluation interpretability and the like of an equivalent virtual inertia evaluation method for a current wind power plant are solved, the method is based on system operation data and is associated with an inertia response dynamic mechanism model, and the interpretability of a system physical process is reserved; a sparse dynamic modeling method is adopted, an input-output linear combination feature library of system electromagnetic torque-rotor rotating speed change is constructed, sparse solution of parameters is achieved through a sequence threshold value least square algorithm, and the equivalent virtual inertia of the wind power plant is obtained through evaluation. According to the method, model priori knowledge and operation data are fully applied, and the evaluation result is high in accuracy and high in interpretability.

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 permanent magnet synchronous wind driven generator parameter identification method based on an improved grey wolf algorithm, and the method comprises the steps: carrying out the optimization of an initial population through employing Cat chaotic mapping and a reverse learning strategy, enabling the traversal to be uniform, achieving a higher iteration speed, introducing a nonlinear convergence factor of cosine change, and strengthening the global search in an earlier stage, thereby achieving the recognition of the parameters of a permanent magnet synchronous wind driven generator. The local search is enhanced in the later stage, the diversity of populations is ensured, the search range is enlarged, the global search capability and the local search capability are balanced, the probability of falling into local optimum is reduced, the identification speed is accelerated, then the tube voltage drop nonlinearity of the voltage source type inverter is compensated, the voltage error between the output voltage and the reference voltage of the inverter is reduced, and the identification accuracy is improved. And finally, learning is carried out by combining memory self-learning and the individual experience of the grey wolf, so that the problems of low parameter identification precision, easiness in falling into local optimum and low speed of the parameter identification method of the permanent magnet synchronous motor are solved.

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 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 present invention relates to a coordinated control method and system of a permanent magnet synchronous generator based on load mutation, and relates to the field of intelligent control technology, including: using sensors to continuously monitor the load condition of the permanent magnet synchronous generator, and collecting the load current, voltage and power factor in real time; comparing the load current, voltage and power factor with the preset safe operation threshold, and triggering an alarm if a mutation exceeding the threshold is detected; in response, activating a PID controller to switch it from a standby state to a working state; the PID controller calculates the adjustment amount through the operation of the three links of proportion, integration and differentiation according to the deviation between the collected real-time data and the set value; according to the adjustment amount, dynamically adjusting the excitation current of the permanent magnet synchronous generator, and adjusting the output power of the generator according to the real-time demand of the power system. The present invention can make an accurate response within milliseconds, and effectively improves the dynamic performance of the generator.

The invention relates to a control method and device of an intelligent excitation system, computer equipment and a storage medium. The method comprises the following steps: acquiring real-time operation data of each candidate control cabinet in the intelligent excitation system; the candidate control cabinets comprise at least two power cabinets and field suppression cabinets; according to the real-time operation data, executing a main node election operation on each candidate control cabinet, and determining a control right priority of each candidate control cabinet according to a sequence that each candidate control cabinet is elected to be a main node by the main node election operation; determining a target control cabinet from each candidate control cabinet in the intelligent excitation system according to the control right priority under the condition that an excitation regulation cabinet in the intelligent excitation system breaks down; and transferring a main control node of the intelligent excitation system from the excitation adjusting cabinet to the target control cabinet so as to control the operation of the intelligent excitation system through the target control cabinet. By adopting the method, the operation reliability of the intelligent excitation system can be improved when the system breaks down.

The invention provides a portable energy-saving power supply and an operation control method thereof. The purposes of energy conservation, environmental protection and noise reduction of portable energy-saving power supply equipment are achieved. The internal combustion engine is coaxially connected with the permanent magnet synchronous generator, the generator is dragged to output three-phase alternating current, the three-phase alternating current is converted into direct-current voltage through the rectifying and filtering module, and stable voltage output is achieved. According to the power output load capacity, the microprocessor chip controls the stepping motor to achieve opening and closing and opening degree control of an accelerator and a choke valve, so that rotation speed control of an internal combustion engine and rotation speed control of a generator are achieved, and stable output of appropriate voltage and power is achieved. When the output voltage meets the requirement, the rechargeable storage battery is cut off through the relay, and the DC-DC power supply module is used for supplying power, so that the electric energy consumption of the rechargeable storage battery is reduced. If the voltage of the rechargeable storage battery is detected to be insufficient during the power supply period of the generator, the output circuit of the generator can be switched to be connected to the battery charging circuit, so that automatic charging of the rechargeable storage battery is realized.

The invention discloses an active control method and system for suppressing torsional vibration of a permanent magnet synchronous wind driven generator, and the method comprises the steps: building a dual mass-rigidity-damping model through a lumped mass method based on transmission chain parameters and pneumatic torque, and obtaining a transmission chain dynamic equation; performing torsional vibration characteristic analysis on the natural wind speed, the pneumatic torque and the transmission chain dynamic equation to obtain a torsion angle, an eigenfrequency, a damping ratio equation and electromagnetic torque influence evaluation; and controller design is carried out on the torsional vibration mathematical model and the active disturbance rejection controller parameters to obtain an electromagnetic torque compensation amount, and active suppression of torsional vibration is realized. According to the invention, through cooperation of a physical model and intelligent control, a sensing-analysis-compensation closed loop is formed; a high-precision mathematical model is constructed, and a wind-machine-electricity coupling effect is captured; the ADRC regards unknown parameters and external disturbance as total disturbance, real-time estimation and compensation are carried out through a tracking differentiator, and an accurate system model is not needed; torsional vibration is restrained, and adaptability is enhanced.

The invention relates to an optimal proportioning method for a grid-constructing type wind turbine generator and a grid-following type wind turbine generator in a wind power plant, solves the problem of subsynchronous oscillation of the grid-following type wind turbine generator in the wind power plant under a weak power grid, and belongs to the technical field of electrical equipment. The method comprises the following steps: respectively establishing state space models of single machines and power grid lines of a network-constructing type wind turbine generator and a network-following type wind turbine generator; according to the established state space model, single-machine port frequency domain impedance in the grid-forming type wind turbine generator set and the grid-following type wind turbine generator set is obtained, black box processing is conducted on all the generator sets, and the equivalent impedance of a whole grid-connected port of the wind power plant is calculated in combination with the connection mode between the wind turbine generator sets and the connection mode between the wind turbine generator sets and a power grid line; positive and negative resistance and capacitive-inductive reactance characteristics of the subsynchronous frequency band are obtained according to the equivalent impedance, the overall interference stability of the wind power plant is judged according to the characteristics, if the stability is not stable, the proportion of the net-forming type wind turbine generator is increased, the equivalent impedance is calculated again till the stability is achieved, and the proportion is output.

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 a wind turbine generator inertia process load optimization control method based on a wind speed estimator, and the method comprises the steps: employing the wind speed estimator and a feedforward controller to calculate the feedforward pitch angle of a wind turbine generator according to the current wind speed, and the wind speed estimator is generated through training of a width learning algorithm; adopting a feedback controller to calculate a feedback pitch angle of the wind turbine generator according to the generator rotating speed of the wind turbine generator and the current wind speed; calculating the pitch angle deviation of the wind turbine generator according to the frequency monitoring value of the wind turbine generator; according to the feed-forward pitch angle, the feedback pitch angle and the pitch angle deviation, the active power of the wind turbine generator is calculated; and performing active power control on the wind turbine generator according to the active power.

The invention discloses a method and system for suppressing subsynchronous oscillation of a voltage source wind turbine generator, and the method comprises the steps: collecting stator three-phase voltage and stator three-phase current of a doubly-fed generator, and obtaining d-axis and q-axis stator voltage DC components and stator current DC components; obtaining a rotor direct current component; obtaining stator output active power, stator output reactive power, and active power and reactive power after passing through a low-pass filter, and obtaining a compensation instruction of adaptive virtual damping control; outputting a d-axis rotor current instruction and a q-axis rotor current instruction, and obtaining a rotor voltage instruction under the synchronous rotating coordinate system; superposing the rotor voltage instruction and a compensation instruction of adaptive virtual damping control to obtain a new rotor voltage instruction; and after the new rotor voltage instruction and the rotor voltage instruction are modulated by an SVPWM link, a rotor side converter switching tube control signal is generated, so that subsynchronous oscillation suppression of the doubly-fed wind power generation system is realized.

The invention discloses a rotor position estimation method under initial turn-to-turn short circuit of an aviation permanent magnet starter generator, and the method specifically comprises the steps: obtaining a correlation formula when a permanent magnet synchronous motor is in a healthy state and a turn-to-turn short circuit fault occurs; on the basis of the turn-to-turn short circuit fault, voltage and current are obtained; inputting the three-phase current and voltage into a sliding-mode observer after the three-phase current and voltage are subjected to Click conversion to obtain back electromotive force; the back electromotive force is filtered, the positive sequence component is extracted, the fundamental wave back electromotive force is obtained, and accurate rotor position information can be estimated through a phase-locked loop. According to the method, when the aviation permanent magnet starter generator is operated in a power generation state without a position sensor, harmonic interference generated by a motor turn-to-turn short circuit fault is separated by designing a high-order generalized integrator, so that a positive sequence component in a fundamental wave back electromotive force estimated value is accurately obtained and is used for rotor position estimation after the turn short circuit fault occurs; the magnetic field orientation deviation caused by the turn short fault is eliminated, and the optimal fault feature extraction environment is ensured.

The invention discloses a permanent magnet direct drive wind power system MPPT nonsingular fast terminal sliding mode control method based on a sparrow search algorithm, and the method comprises the steps: building a fan mathematical model, and building a permanent magnet synchronous generator stator voltage equation based on a synchronous rotating coordinate system dq; designing a nonsingular fast terminal sliding mode controller for a rotating speed ring, wherein a state error e = omega * m-omega m is taken as a control target; designing a nonlinear function of a variable boundary layer in combination with a Softsign function; designing a fixed time sliding-mode observer, performing estimation and active compensation on internal and external disturbance uncertain factors of the system, and performing feedforward compensation on an observation value to a non-singular fast terminal sliding-mode controller to offset interference; the to-be-designed parameters in the nonsingular fast terminal sliding mode controller are optimized based on the improved sparrow search algorithm, and the parameters are obtained more accurately. According to the method, the chattering phenomenon existing in sliding mode control is effectively reduced, the improved sparrow search algorithm is used for optimizing controller parameters, a wind power system has the better response speed, the wind energy utilization efficiency is improved, and maximum power tracking is achieved.

The invention relates to a sending end frequency active support coordination control method for wind power through a high-voltage direct-current delivery system, and belongs to the field of frequency stabilization of large-scale wind power through the high-voltage direct-current delivery system. The method comprises the following steps: firstly, according to unbalanced power caused by power regulation margins and disturbance of various frequency modulation resources, analyzing high-voltage direct current system sending end system frequency support requirements in different scenes; secondly, providing a wind power plant multi-time scale frequency modulation control strategy based on the doubly-fed wind turbine generator and a doubly-fed wind turbine generator and high-voltage direct current system frequency support coordination control strategy considering a frequency modulation dead zone; finally, key control parameters in the control link of the doubly-fed wind turbine generator and the high-voltage direct-current system are designed according to the power regulation margin of the synchronous generator set and the wind power plant, so that inertia support and primary frequency modulation effects can be adaptively switched according to different scenes; the quick response capability of the doubly-fed wind turbine generator and the high-voltage direct-current system is exerted, and meanwhile, the power adjusting capability of each unit is fully utilized.

The invention discloses a low-voltage ride-through control method considering voltage measurement delay estimation, and the method comprises the steps: carrying out the modeling of a typical vector control system of a doubly-fed wind power system, obtaining a reactive power output limiting condition, and carrying out the building of a voltage measurement equipment output model, on this basis, a cosine interpolation fitting method is adopted to accurately estimate the time delay of a voltage measurement device for the grid-connected point voltage of the doubly-fed fan, and after accurate time delay estimation is determined, the time delay is substituted into a low-order time delay compensation control link, so that the power instruction of the doubly-fed fan is compensated. According to the method, the actual voltage delay of the grid-connected point is accurately estimated, and a voltage measurement delay compensation method is adopted to optimize a voltage control strategy of the doubly-fed fan, so that the problem of overvoltage of the grid-connected point caused by delay of a voltage measurement link is reduced.

The disclosure relates to a four-phase motor and generator device with increased efficiency for generating electrical energy. The device features a stator wall with eight stator slots and four pole groups, and an armature rotatable within the stator wall. The eight stator slots are divided into four pole groups of opposing stator slots; the two opposing stator slots include an N (North) stator slot and an S (South) stator slot. N and S stator slots are alternatively activated in response to the rotation of the armature. The activation of the armature pole groups results in armatures rotating the magnetic field within the stator wall, and only four of the eight poles are actively coupled in any given configuration. The disclosure also includes a method of operating the motor for generating electrical energy with increased efficiency and in an environmentally friendly manner compared to conventional motors.

The present invention discloses an emergency seamless switching system and method for a fully water-cooled permanent magnet synchronous diesel generator set, comprising a diesel generator set, an AC-DC bidirectional inverter main circuit, and a DC-DC bidirectional converter main circuit. The AC-DC bidirectional inverter main circuit is provided with three voltage lines L1, L2, L3 and a zero line N for providing a three-phase voltage to a load. The DC-DC bidirectional converter main circuit is connected to an energy storage battery pack. The permanent magnet synchronous generator outputs a DC bus voltage U through the AC-DC bidirectional inverter main circuit. C And three-phase voltage, DC bus voltage U C The energy storage battery pack is charged through the DC-DC bidirectional converter main circuit. When the load suddenly increases and the DC bus voltage U C When the voltage drops, the energy storage battery pack will boost the voltage through the DC-DC bidirectional converter main circuit to make the DC bus voltage U C Increases to maintain the DC bus voltage U C The present invention improves the adaptability of the diesel generator set under sudden load conditions, the emergency response capability under abnormal conditions and the stable power supply capability during the startup phase.