15 results about "Space vector modulation" patented technology

This invention relates to the field of inverter technology, and particularly to a heterogeneous power device hybrid inverter and its space vector modulation method. The heterogeneous power device hybrid inverter provided in this invention includes a first constant current source, a second constant current source, a main power inverter module, a secondary power inverter module, and a capacitive reactance module. The first constant current source is connected to the main power inverter module to provide current to the main power inverter module. The main power inverter module includes multiple silicon-based insulated-gate bipolar transistors (SBMTs) as main switching transistors, and the main power inverter module is connected to the capacitive reactance module. The second constant current source is connected to the secondary power inverter module to provide current to the secondary power inverter module. The secondary power inverter module includes multiple silicon carbide-based metal-oxide-semiconductor field-effect transistors (MOSFETs) as secondary switching transistors, and the secondary power inverter module is connected to the capacitive reactance module. The heterogeneous power device hybrid inverter and its space vector modulation method provided by this invention can balance high inverter frequency and low switching losses.

The application discloses a permanent magnet synchronous motor model prediction torque control method based on a hybrid mode optimization. The method first constructs a reference voltage vector through a torque error target function and a discretization prediction model of the permanent magnet synchronous motor, and then designs a hybrid mode optimization algorithm. The algorithm first designs a double-vector mode optimization on the sector boundary of a voltage space vector diagram, and then designs a three-vector optimization mode based on a discrete space vector modulation inside the sector. The optimal synthesized voltage vector obtained by the hybrid mode optimization algorithm is transmitted to a voltage error target function to realize the switching of the two modes, so that the control execution mode and the optimal synthesized voltage vector are determined. The control method disclosed by the application has high freedom to adjust the amplitude and position of the synthesized voltage vector, and thus has high steady-state performance of the control system and fast torque dynamic response in the full speed range.

This invention proposes an innovative model predictive control-based current control method and system for permanent magnet synchronous motors (PMSMs), aiming to address the problems of slow dynamic response and low control accuracy in traditional control methods when facing parameter variations and external disturbances. By constructing an accurate mathematical model, this invention not only improves the dynamic response speed and control accuracy of the motor but also significantly reduces torque ripple, thereby enhancing the stability and reliability of motor operation. Furthermore, the introduction of intelligent algorithms such as neural networks or fuzzy logic, as well as adaptive control algorithms, further enhances the system's adaptability and robustness. The application of space vector modulation technology optimizes the current waveform, further reducing torque ripple and improving the smoothness of motor operation. The control method of this invention is suitable for industrial applications with extremely high requirements for dynamic performance and control accuracy, demonstrating its broad application potential in the field of modern industrial motor control.

The application discloses a kind of based on target speed dynamic compensation blast motor control method and system, it is first to collect the original sampling data of blast motor, and extract out key features such as quadrature-axis current, real-time speed and bus voltage by characteristic decoupling.Then, based on the dynamics correlation of quadrature-axis current and real-time speed, dynamically inverse the real-time aerodynamic flow resistance coefficient of current gas path system.Subsequently, by comparing real-time and calibration flow resistance coefficient to determine resistance deviation ratio, and using the ratio to adaptively correct the reference speed set by user, obtain the compensation target speed to maintain constant air volume.Based on this, closed-loop operation is carried out in combination with speed deviation, and bus voltage feedforward compensation and space vector modulation are introduced to generate control signals for driving inverters.In this way, the influence of filter aging or damper switching on air duct resistance fluctuation can be effectively eliminated, and precise control of constant air volume of blast motor under variable load conditions can be realized.

AC control systems, devices and methods which can, for instance drive a power converter coupled to drive electric machines (e.g., electric motors) advantageously employs an AC controller that implements current mode control utilizing an average current controller in conjunction with and an AC peak current controller with high bandwidth. Such can advantageously employ a fixed switching frequency, and utilize a zero vector to generate the same DC link ripple current as would be generated using field orientated control (FOC) with space vector modulation (SVM).

This application discloses a control method and system for a solar-powered negative pressure wind turbine based on adaptive adjustment. It establishes a torque margin boundary by modeling the transient power of photovoltaic voltage and current signals to quantify the photovoltaic supply capacity, and utilizes a reduced-order extended state observer to reconstruct aerodynamic load disturbances online. Furthermore, it integrates the ambient temperature demand into a target speed command using a fuzzy controller, and generates a torque command based on disturbance observations through feedforward compensation. After dynamic limiting constraints on the photovoltaic supply boundary, it synthesizes a frequency conversion drive signal through quadrature-axis torque decoupling and space vector modulation. This method unifies photovoltaic power supply constraints, aerodynamic disturbance compensation, and environmental demand response into a closed-loop control framework, ensuring that the torque command is always constrained within the real-time supply range of the photovoltaic system. This effectively prevents bus voltage collapse and system shutdown, while simultaneously ensuring stable operation of the wind turbine over a wide speed range, achieving synergistic protection of aerodynamic compensation robustness and photovoltaic power supply safety.

This invention discloses a thirteen-segment space vector modulation method for a nine-phase motor. Specifically, by fixing the switching transistors of three adjacent phase bridge arms inactive within each carrier cycle, the number of non-zero voltage vectors is reduced from eight to six. This actively discards the third harmonic space control degree of freedom while retaining the fundamental, fifth, and seventh harmonic space voltage regulation capabilities. It adapts to application scenarios with three sets of three-phase neutral point isolation, avoiding current distortion and torque ripple caused by third harmonic currents. The method sequentially completes sector division judgment, voltage vector decomposition, calculation of switching action time according to the volt-second balance principle, and generation of bridge arm switching signals. It then synchronously inversely modulates the voltage and modulation wave at fixed intervals, achieving alternating action of two discontinuous PWM signals to balance device losses. This invention reduces computational load, allows for flexible control of harmonic space voltage, effectively suppresses current harmonics, and significantly improves system power density, thermal management flexibility, and control efficiency.

This application discloses a grid-connected energy storage converter and its control method. The method includes: outputting a grid impedance value based on the grid connection point voltage amplitude, active current, and reactive current in multiple operating points; calculating a PWM modulation voltage command based on the output voltage phase, output voltage reference value, grid connection point voltage, grid connection point current, and the grid impedance value; and performing space vector modulation on the PWM modulation voltage command to generate a drive signal for controlling the grid-connected converter. By introducing grid impedance measurement, this application can actively sense changes in the grid without affecting the normal operation of the energy storage converter, thereby automatically adjusting control parameters to adapt to different grid scenarios. Furthermore, it simplifies the design of the converter's control strategy and parameters, and reduces the workload of product maintenance during application while ensuring its grid adaptability and support.

The application discloses a midpoint voltage DC offset suppression method for a Vienna rectifier and belongs to the technical field of Vienna rectifier control. The application is aimed at the problem that the bipolar DC bus of the Vienna rectifier has midpoint voltage DC offset under the light load condition of unbalanced load. The application comprises the following steps: calculating the maximum q-axis current of odd and even sectors according to the corresponding relationship of grid current vectors and reference voltage vectors in a voltage space vector diagram; simultaneously calculating the q-axis current amplitude; then calculating the q-axis current instruction value and the d-axis current instruction value; further calculating the d-axis reference voltage u d and the q-axis reference voltage; finally, performing dq-axis system to alpha-beta-axis system conversion on the d-axis reference voltage u d and the q-axis reference voltage u q , and combining space vector modulation to obtain the driving signal of the Vienna rectifier, so that the midpoint voltage DC offset suppression is realized. The application is used for suppressing the midpoint voltage DC offset of the Vienna rectifier.

This invention belongs to the field of servo system control technology, specifically relating to a dynamic error compensation control method and system for a servo drive system. This invention effectively reduces torque fluctuations in the servo system during high-speed operation by calculating torque errors based on real-time data and generating compensation amounts. By correcting the three-phase current signals, it further improves the accuracy of current commands and reduces the impact of harmonic interference on system performance. Combining motor rotor acceleration and current ripple information, it comprehensively considers nonlinear disturbance factors and generates a total compensation strategy by superimposing compensation torque. Simultaneously, it adjusts the proportional gain and feedforward weight according to the dynamic mapping relationship between the rate of position change and the harmonic distortion rate, enabling the servo system to maintain optimal control performance under different operating conditions. Finally, all compensation results are injected into the feedforward and feedback channels, generating corresponding drive pulse signals based on space vector modulation, achieving efficient drive control of the servo system.

The application relates to a motor control method based on single-resistance sampling, a controller and an electrical device. The method generates PWM signals by adopting a five-segment space vector modulation strategy when the motor is in a starting stage, and generates PWM signals by adopting a seven-segment space vector modulation strategy when the motor is in a running stage. Therefore, the method adopts the five-segment modulation strategy in the starting stage, so that the sampling time window is directly equal to the complete action time of the non-zero voltage vector, the width is doubled, sufficient establishment time is provided for the sampling circuit, switching noise interference is effectively resisted, and the reliability of current sampling in the heavy load and low speed starting stage is ensured. In the running stage, the seven-segment modulation is switched to, the zero vectors are symmetrically distributed, the current harmonic is small, the electromagnetic noise is low, the high-frequency control performance is good, and the silence, low vibration and high dynamic response in the stable operation of the motor are realized.

The application provides a grid-connected inverter harmonic suppression model-free robust control method, and belongs to the technical field of photovoltaic grid control. The application comprises the following steps: establishing an LCL inverter hyperlocal model; designing an adaptive gain expansion state observer for estimating grid-side current and lumped disturbance items in the grid-connected inverter hyperlocal model; designing a double second-order generalized integrator for filtering a sampling current and extracting a pure fundamental positive sequence component; and using the current and disturbance information predicted by the observer, calculating a reference voltage based on the zero-error principle, and driving the inverter through space vector modulation. The application only needs to sample the grid-side current, can reduce the hardware cost and dependence on an accurate model, and thus can significantly improve the control accuracy, dynamic response and robustness of the system under parameter perturbation and grid disturbance.

The application provides a hybrid multi-level inverter predictive control method, a discrete model predicted by a single vector model is used to establish a value function without a weight factor, and a voltage predicted when the value function minimum is used to replace a reference voltage to perform space vector modulation. A fault-tolerant control method is to establish a seven-level voltage space vector diagram, remove the coordinates lost in the space vector diagram due to bypassing the H-bridge unit due to failure, and continue to perform space vector modulation by using the remaining coordinates. The application uses single vector model prediction to reduce the calculation amount of the value function while ensuring accuracy, uses a common-mode reduction method to reduce the system common-mode voltage, so that the method can be applied in the photovoltaic industry to prevent damage to other devices caused by large common-mode voltage.

The present application relates to energy storage control technology field, and further relates to a harmonic suppression and power quality adaptive control method of energy storage converter, comprising the following steps: step 1, multi-channel signal acquisition and harmonic component separation: the output current signal, the output voltage signal and the DC bus capacitor voltage signal of the active neutral point clamped three-level inverter are collected; step 2, port-controlled Hamilton energy shaping and super-spiral sliding mode fusion control: the port-controlled Hamilton system framework is constructed with the bridge arm inductance current and the capacitor voltage as the state variable; step 3, inverter modulation and active neutral point potential balance: the basic voltage vector is determined by the space vector modulation of the composite modulation voltage, and the gate drive pulse is generated to drive the active neutral point clamped three-level inverter. The present application realizes the accurate tracking of fundamental current, effective suppression of harmonic current and active balance of neutral point potential, and improves the power quality and operation reliability of the energy storage converter.