28results about "Synchronous generator control" patented technology

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.

This invention relates to a voltage limiting control method for a series-type offshore wind power DC collector system, comprising: superimposing a low-voltage DC link voltage control loop on the power control loop of the wind turbine generator-side converter, and obtaining a reference value for the d-axis component of the generator-side converter voltage. umsd_ref and q-axis component reference value umsq_ref The control signal for the generator-side converter is generated through sinusoidal pulse width modulation to maintain stable low-voltage DC link voltage while ensuring stable power output. The grid-side converter of the wind turbine adopts voltage / frequency control to obtain the d-axis reference value of the grid-side converter output voltage. uod _ ref and q-axis reference value uoq _ ref The grid-side converter control signal is generated by sinusoidal pulse width modulation. By setting the d-axis setpoint of the grid-side converter output voltage, the AC output voltage of the grid-side converter is limited, thereby controlling the DC output voltage of the wind turbine generator within the limit value.

This invention discloses a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance, comprising: determining the target generator set to be suppressed by the STATCOM controller, its target torsional vibration mode, and typical operating modes; for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method, calculating the effective range of phase-shifting angles in which the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation; performing an intersection operation on the effective ranges of phase-shifting angles of all typical operating modes to obtain a common safe configuration range; selecting phase-shifting angle values ​​from the safe configuration range and configuring them into the damping control channel of the corresponding key shaft torsional vibration mode in the STATCOM controller.

The application discloses a double-fed wind power flexible DC transmission system DC overvoltage suppression method and device, and the method comprises the following steps: collecting the DC line voltage of the flexible DC system, calculating the surplus power by using the charging effect of the converter submodule; determining the dynamic voltage reduction coefficient of the wind farm side flexible DC converter station WFMMC according to the surplus power amount; determining the value range of the dynamic voltage reduction coefficient to ensure that the double-fed wind farm enters the low voltage ride-through interval; after the double-fed wind farm enters the low voltage ride-through interval, determining the reduction amount of the power output according to the surplus power amount; and distributing the reduction amount to each wind turbine connected to the AC side of the WFMMC according to the power reduction distribution coefficient; detecting the DC voltage of the wind turbine converter, and if the DC voltage exceeds the action value, the DC voltage of the converter is suppressed. The application effectively suppresses the DC system overvoltage problem from the DC system converter and the double-fed wind turbine generator set side.

The full direct current offshore wind power system based on network type direct current fan relates to the field of model construction of full direct current offshore wind power system. The existing full direct current OWP system has the problems of too large volume and weight. The full direct current offshore wind power system based on network type direct current fan and uncontrolled direct current transformer is realized, the uncontrolled direct current transformer (U-DCT) is operated in the open loop control mode of the maximum modulation ratio, the internal alternating current voltage can be maximized, the sub-module capacitor value and conduction loss are reduced, and the economy of the full direct current offshore wind power system is effectively improved; the use weight and installation volume of the capacitor device are greatly reduced; the application of the full direct current offshore wind power system is mainly used in the field of offshore wind power.

This invention provides a regularized CNN-GRU control method based on the physical mechanism of the excitation system in thermal power plants, belonging to the field of excitation control technology. The method mainly includes: constructing an input feature vector and normalizing it; mapping the normalized time-series features to a multi-branch dilated convolutional operator layer composed of multiple sets of parallel operators to generate a global spatial feature vector; feeding the global spatial feature vector into a GRU network embedding a physical consistency gating unit; embedding the second-order rotor motion equation as a gradient constraint factor into the loss function; and linearly superimposing the discretized PID main path output with the network output, generating the final excitation voltage command through a limiting operator. This invention can force the control command to return to the feasible region of physical laws under small sample and strong random disturbance environments, improving the transient damping support efficiency and adaptive control accuracy of the excitation circuit.

The application relates to a network-constructing doubly-fed wind turbine wind speed segment adaptive control method based on equivalent impedance, which is applied to the network-constructing doubly-fed wind turbine grid-connected operation process. When voltage disturbance occurs in the power grid, the wind turbine operation control parameters are adaptively adjusted by combining equivalent impedance modeling and wind speed segment regulation. The method comprises the following steps: collecting wind turbine operation parameters, determining the operation condition, determining the segments according to the wind speed, adaptively adjusting the control parameters based on the equivalent impedance model, updating the control parameters to form a closed-loop control process. Through the method, the coordination between the voltage support capability and the rotor current limiting requirement of the network-constructing doubly-fed wind turbine under different wind speed conditions is realized, and the operation stability and safety of the wind turbine under the voltage disturbance condition are improved.

The invention discloses a permanent magnet synchronous generator MPCC control method and system. The method comprises the steps that output data of a permanent magnet synchronous generator are collected; establishing a system time domain equation, and preprocessing the system time domain equation according to the output data to obtain a system model prediction equation; correcting an error of an actual control system based on the system model prediction equation; and performing rolling optimization on the error corresponding to each voltage vector by using a value function based on a current error to obtain an optimal switching vector which minimizes the value function, and acting the optimal switching vector on a machine side rectifier to complete control on the permanent magnet synchronous generator. The method has better dynamic response characteristics and anti-interference performance.

The embodiment of the application provides a kind of active support motor equipment control method and system based on flywheel energy storage.The method comprises: real-time detection grid-side active power and stator-side active power;Determine rotor-side active power deviation based on the grid-side active power, stator-side active power;Based on the rotor-side active power deviation and the preset power conservation relationship, calculate dynamic compensation quantity;Based on dynamic compensation quantity, adjust active outer loop instruction signal for controlling active power exchange.Thereby eliminate rotor-side active power deviation, compensate converter loss, and dynamically optimize compensation parameters according to grid disturbance, finally realize the accurate active power exchange of equipment and grid.

This application discloses a collaborative control method for an excitation system compatible with both generator and synchronous condenser operating conditions. By decoupling and reconstructing electromechanical sensor data and performing pattern recognition, it captures the time-varying inertial parameters of the unit during operating condition transitions in real time. Based on this, a state-space observation mechanism based on flux linkage continuity prediction is constructed, directly transforming the evolution of the system's inertial boundary into feedforward compensation voltage. This collaborative control strategy, by introducing dynamic time-varying inertia as a compensation benchmark, can overcome the adjustment dead zone of traditional proportional-integral converters, directionally eliminating flux linkage deviations within milliseconds and effectively suppressing transient reactive power drops. The resulting smooth switching not only significantly improves the control robustness of the excitation system under extreme transient conditions but also fundamentally avoids actuator saturation risks and shaft derailment shutdown hazards, greatly enhancing the voltage disturbance rejection capability of synchronous units in new power systems.

To control the automatic voltage regulator to perform optimal startup control while suppressing overshoot during generator startup. [Solution] The present invention is a control device for an automatic voltage regulator, comprising: a switch that generates a switching signal according to the voltage detection level in order to switch the control gain of the automatic voltage regulator between the initial startup and after setting; and a gain setter that generates a gain signal that sets the type and number of control gains based on the switching signal and provides the gain signal to the automatic voltage regulator.

The application discloses a three-stage synchronous motor based on a third-order phase-locked loop and a simplified demodulation method of a rotor position at zero and low speed, and single-phase AC excitation is applied to a main excitation machine of the three-stage synchronous motor to make dq-axis voltage with position error information generated on a stator side of a main generator; a process processing signal with a low-frequency position error signal is constructed through band-pass filtering and product operation; a middle signal is obtained by adopting a wave trap to suppress a second harmonic component of the process processing signal; the middle signal is input into a third-order phase-locked loop to calculate an estimated position of a rotor, sector correction is carried out according to a stator current sign, an initial position angle is obtained, and high-precision rotor position estimation under a zero and low speed working condition of the three-stage synchronous motor is realized. In the demodulation process of the application, the harmonic analysis frequency is clear, the structure of the wave trap cascaded with the third-order phase-locked loop is adopted, low-frequency position error signals and high-frequency harmonics are effectively isolated, and the rotor position estimation precision in the acceleration process of the motor is significantly improved.

The application discloses a kind of inertia response control method, system, equipment, medium and product of doubly-fed wind turbine, related to new energy power generation equipment field, which comprises: based on reference power, using power controller to determine original rotor current reference instruction, carry out polar coordinate transformation, obtain rotor current amplitude and rotor current phase;First-order low-pass filter is carried out to stator q-axis voltage, and additional amplitude is generated;The difference between rotor current amplitude and additional amplitude is obtained to obtain final current amplitude;When grid frequency deviation deviates from rated value, additional phase angle is superimposed on rotor current phase to obtain final current phase;Polar coordinate inverse transformation is carried out to final current amplitude and final current phase, and final rotor current reference instruction is obtained, and drive signal of converter power tube is generated after adjustment and modulation, and inertia response control is realized.The application has more rapid response speed, and improves the inertia performance of doubly-fed wind turbine during frequency disturbance.

The pumped storage excitation start-stop circuit based on static action of thyristor is composed of a DC magnetic field closing circuit, an abnormal shutdown excitation system operation circuit and a normal shutdown excitation operation circuit. The abnormal shutdown excitation system operation circuit is connected with the opening control coil J3 in the DC magnetic field circuit breaker FCB, the abnormal shutdown closing pulse relay J4, the delay closing pulse relay J5, the closing and opening magnetic shunt relay J6 and the closing pulse relay J7 / J8, and the input of the excitation system magnetic shunt relay is realized. The closing pulse relay J7 / J8 controls the opening of the normally closed contact K7 / K8 to realize the control of the excitation rectifier bridge SCR closing pulse signal. The start-stop of the pumped storage excitation system is controlled, and the normal shutdown logic of the excitation is achieved, that is, the accident shutdown process of the excitation system is not affected. The key of the accident shutdown process is that the excitation regulator inverter is started, the magnetic resistance is immediately closed and opened, the short-time closing pulse is still realized, and the DC magnetic field circuit breaker is quickly tripped.

This invention belongs to the field of wind power system control and dispatching technology. It proposes a collaborative optimization method for wind power systems that considers spatiotemporal heterogeneity and coupling dependence. First, this invention constructs a power system node frequency model that takes into account the differences in power frequency characteristics between thermal power and grid-connected power electronic equipment, characterizing the spatiotemporal heterogeneity of frequency dynamic evolution after wide-area grid disturbances. Then, it establishes a coupling dependence model between new energy support characteristics and system strength, evaluates the maximum feasible region for new energy units to participate in frequency support, and quantifies the collaborative support capability of wind power participation in frequency regulation and thermal power start-up for regional frequency security. Finally, based on frequency security constraints, it constructs an integrated optimization framework for unit combination and frequency characteristics, collaboratively optimizing start-up methods and wind power frequency regulation parameters. The resulting dispatching scheme can fully release the support capacity of wind farms and energy storage systems, effectively reduce thermal power start-up, and at the same time ensure the regional frequency security of the system.

The present application relates to the internal combustion engine power generation technical field, especially to a kind of hydrogen ammonia dual-fuel internal combustion engine power generation system and control method;Hydrogen ammonia dual-fuel internal combustion engine power generation system is configured with hydrogen ammonia dual-fuel internal combustion engine, hydrogen ammonia dual-fuel internal combustion engine includes hydrogen ammonia fuel storage supply module, combustion synergic control module, exhaust turbocharging intercooling module, waste heat recovery conversion module, intelligent parameter adaptation module and power output integration module.Intelligent parameter adaptation module is configured to be used to execute the control method of hydrogen ammonia dual-fuel internal combustion engine power generation system, to adjust fuel mixing ratio, adjust turbine bypass valve opening and intake boost pressure, waste heat distribution ratio and the like.Through such mode, it solves the technical problem that existing hydrogen ammonia dual-fuel internal combustion engine power generation system control technology exists power generation efficiency insufficiently in high penetration rate hydrogen ammonia application scene, improves the operation stability of power generation system, fuel utilization efficiency and overall energy conversion efficiency.

This invention provides a control method for low-efficiency power feeding of a permanent magnet synchronous motor (PMSM). The method employs a motor controller to control the low-efficiency power feeding of the PMSM in generator mode. In practical applications, some operating conditions do not require the PMSM to operate in the high-efficiency region in generator mode. The motor control is adjusted according to actual needs to achieve the desired generator current. This method improves the problem of uncontrollable generator current when the PMSM continuously operates in the high-efficiency region in generator mode. The use of a closed-loop regulation method based on the actual bus current effectively ensures the robustness and controllability of the system.

This invention discloses a fully controlled rectifier on the engine side and its control method. The fully controlled rectifier power conversion scheme of this invention has strong control capability. It can change the hydraulic fluid flow rate by controlling the engine speed, and suppress power fluctuations in conjunction with the hydraulic motor and hydraulic accumulator. It can greatly reduce the capacity of the system energy storage link. At the same time, it has the advantages of high system efficiency and low output current harmonics. Therefore, this invention uses a three-phase voltage-type fully controlled rectifier based on IGBT.

This invention relates to a rule-based coordinated control method for wave energy independent power generation, storage, and utilization in a wave energy independent power generation system. It is applicable to the fields of wave energy power generation and electrochemical energy storage. The technical solution adopted in this invention is: a rule-based coordinated control method for wave energy independent power generation, storage, and utilization in a wave energy independent power generation system, characterized in that: the wave energy independent power generation system includes a power generation unit, an energy storage unit, an energy consumption unit, and a system coordination controller; the power generation unit includes a power generation branch, a power consumption branch, and a power generation unit controller; the energy storage unit includes an energy storage branch and an energy storage unit controller; the energy consumption unit includes a non-self-consumption AC / DC load branch and a load controller; the power generation branch of the power generation unit is connected to the power consumption branch, the energy storage branch, and the non-self-consumption AC / DC load branch via a DC bus.

This invention provides a method, apparatus, device, and medium for adaptive rotor kinetic energy control of a wind turbine. The method includes: acquiring the initial rotational speed, real-time rotational speed, lower limit of rotational speed of the wind turbine rotor, and real-time frequency of the power grid when the real-time frequency of the power grid does not meet the rated frequency; determining the adaptive coefficient of the kinetic energy factor of the wind turbine rotor based on the initial rotational speed, real-time rotational speed, and lower limit of rotational speed; controlling the kinetic energy of the wind turbine rotor based on the adaptive coefficient of the kinetic energy factor and the real-time frequency of the power grid; and using the kinetic energy of the wind turbine rotor to adjust the real-time frequency of the power grid, so that the real-time frequency of the power grid meets the rated frequency after adjustment. This invention achieves dynamic adjustment of the adaptive coefficient of the kinetic energy factor and real-time quantification of the rotor kinetic energy release, improving the flexibility of control parameters and the utilization rate of the wind turbine rotor kinetic energy.

The application discloses a direct-current voltage control method and system for a rotary motor type new energy rectifier. The method comprises the following steps: firstly, a state space model of the rotary motor type new energy rectifier is constructed; then, a disturbance source and an output voltage disturbance component of the rotary motor type new energy rectifier are analyzed to obtain a disturbance result; subsequently, a cascade type extended state observer is constructed according to the state space model and the disturbance result; then, the disturbance factors affecting the direct-current voltage fluctuation of the rectifier are detected through the cascade type extended state observer, and the dynamic and steady state control requirements of the rectifier can be obtained; subsequently, according to the dynamic and steady state control requirements, the bandwidth and gain parameters are determined, and the corresponding state feedback control rate of the direct-current voltage control can be obtained to realize the stable control of the direct-current voltage. Through the construction of the cascade type extended state observer to capture the disturbance and the design of the state feedback control rate, the control precision and the system anti-disturbance ability of the direct-current voltage of the new energy rectifier under complex disturbance are effectively improved.

The application discloses a kind of small signal model modeling method and equipment of double-fed wind power grid-connected system under AC asymmetric condition. Including the following steps: the nonlinear periodic time-varying dynamic model of mechanical system is established, the original nonlinear periodic time-varying dynamic model of electrical system and the nonlinear periodic time-varying dynamic model of control system;The original nonlinear periodic time-varying dynamic model of electrical system is carried out dq-sequence dynamic phasor transformation, and the key variable dominant frequency component is retained, to obtain the simplified nonlinear periodic time-varying dynamic model of electrical system;The nonlinear periodic time-varying dynamic model of mechanical system, the nonlinear periodic time-varying dynamic model of control system and the simplified nonlinear periodic time-varying dynamic model of electrical system are linearized on the steady-state periodic trajectory, integrated and eliminated algebraic variable, to obtain the linear periodic time-varying small signal model of double-fed wind power grid-connected system, the application provides modeling basis for wideband oscillation analysis of wind power system under asymmetric condition.

This invention discloses a method for zero-low-speed rotor position estimation of a three-stage synchronous motor. By injecting single-phase AC current into the main exciter of the three-stage synchronous motor, the αβ-axis response voltage signal of the main generator stator is extracted. A single second-order generalized integrator is used to simultaneously extract the second harmonic response signal and its orthogonal components. Based on the orthogonal signals, a low-frequency sine and cosine signal containing rotor position information is directly constructed through linear operations. The amplitude is then normalized to obtain a unit circle sine and cosine signal, which is input into a third-order phase-locked loop to achieve rotor position estimation. This invention avoids the use of complex cascaded filtering structures, simplifies the signal chain, and achieves high-precision rotor position estimation and reliable starting of the three-stage synchronous motor under zero-low-speed conditions.

The application relates to a heat-electricity decoupling and shaft power flexible adjustment device of a back pressure combined heat and power system. The device solves the problems that the traditional back pressure combined heat and power unit is difficult to realize continuous and flexible power transfer and has low energy efficiency in the prior art. The device comprises a steam turbine arranged coaxially and in series on a main shaft, a reversible synchronous motor and a load, the reversible synchronous motor is connected with an excitation adjusting system and a power control system, the electrical end of the reversible synchronous motor is connected to a plant power bus through a circuit breaker, the power control system is connected with the steam turbine and the load respectively, and the power control system receives the difference between the power signal of the steam turbine and the required power of the load to control the working mode and the power flow direction of the reversible synchronous motor. The device has the advantages that the operation flexibility, energy utilization efficiency and economic benefits of the system are greatly improved.

A method for controlling an electrical converter is disclosed. First, an average flux reference is determined from a reference torque and an estimated torque. At least one difference flux reference is determined from at least one difference current reference. A winding flux reference for each winding system is determined from the average flux reference and the at least one difference flux reference by adding and / or subtracting the at least one difference flux reference to the average flux reference. Switching commands for each converter branch are determined from the winding flux reference and an estimated winding flux for the winding system, which is connected to the respective converter branch. The winding flux reference and the estimated winding flux are provided to a dedicated model predictive controller for the respective converter branch, which determines the switching commands; and applying the switching commands to each converter branch.

The application provides a generator system based on a high-frequency isolation matrix converter and a regulation method, and relates to the field of power generation, power transformation or power distribution.The generator system based on the high-frequency isolation matrix converter comprises a permanent magnet synchronous generator, a high-frequency matrix converter, a center-tapped high-frequency matrix transformer and a full-bridge converter, an output port of the permanent magnet synchronous generator is connected with the high-frequency matrix converter in the next stage, three-phase input of the high-frequency matrix converter is connected with the permanent magnet synchronous generator, the most common voltage source type device on the market is used, the cost and reliability of the device are ensured, the existing device common drain or common source connection is not needed, the additional conduction resistance of the device series connection is reduced, a complex multi-step commutation method is not needed, the simplified commutation strategy can omit the additional controller cost, the commutation failure probability is reduced, and the reliability of the system is enhanced.

The application relates to the field of generator set excitation control, in particular to a flexible standby excitation system, device and method, the system comprising: a full-control rectifier bridge, an AC input end of the full-control rectifier bridge being connected with AC plant power; a plurality of standby excitation switches, one end of each standby excitation switch being connected in parallel with a DC output end of the full-control rectifier bridge, and the other end being connected with a rotor circuit of one generator set in a plurality of generator sets; a control module, being connected with the full-control rectifier bridge and the standby excitation switches; a plurality of analog signal interface modules, each analog signal interface module collecting analog quantity signals of a corresponding generator set; an analog quantity gating module, an input end of the analog quantity gating module being connected with the analog signal interface modules, and an output end of the analog quantity gating module being connected with an analog quantity collection channel of the control module; and the control module being configured to: monitor the states of the standby excitation switches, and when it is monitored that one standby excitation switch is closed, control the analog quantity gating module to select and connect the analog signal interface module corresponding to the generator set to which the standby excitation switch belongs to the analog quantity collection channel. The application improves the economy and reliability of power plant operation.

The present application belongs to the technical field of virtual synchronous generators, and particularly relates to a control method and device of a virtual synchronous generator and a medium, which calculates a maximum power reference value according to a fan rotating speed. The direct current voltage is stabilized through a generator-side converter. Through a grid-side converter, the power reference value is tracked based on a virtual synchronous generator model and the synchronous machine characteristics are simulated to realize the active and reactive power control of the grid. Through control cooperation, wind energy capture is realized. When the grid frequency or voltage is abnormal, the output power is adjusted to provide support and normal operation is restored after the fault. The method enables the wind turbine generator to have the inertia and damping characteristics of the synchronous generator, can support the grid frequency and voltage, improves the stability of the power system under new energy access, ensures smooth recovery after the fault, and improves the wind energy utilization rate and power supply reliability.