14 results about "Gain margin" patented technology

The invention provides an AC-AC converter control parameter setting method, and belongs to the field of power electronic control. In order to solve the problems that traditional PID control parameters are lagged in adjustment and large in overshoot under the dynamic working condition, an AC-AC converter small-signal model of a single-tube reverse series bidirectional electronic switch topology is established, and the control parameters are optimized in combination with frequency domain characteristics. The method specifically comprises the following steps: establishing a state-space equation by adopting a switching period averaging method, performing linearization processing, and deducing a system dynamic transfer function; introducing duty ratio disturbance based on a steady-state working point to construct a small-signal model, and forming a three-order open-loop system through a serial PI controller; and according to a closed-loop pole configuration matching characteristic equation coefficient, analyzing and solving proportion and integral parameters. By dynamically optimizing the phase margin and the gain margin, the response speed and stability of the converter under input fluctuation and load abrupt change are remarkably improved, and the method has high engineering application value.

The invention provides a stability margin calculation method of a new energy station grid-connected system, a terminal and a storage medium. The method comprises the following steps: acquiring inverter output impedance and power grid side equivalent impedance of an initial new energy station grid-connected system under multiple working conditions; taking the ratio of the output impedance of the inverter to the equivalent impedance of the power grid side under the same working condition as an open-loop transfer function, and determining a gain margin and a phase margin of the new energy station grid-connected system under each working condition based on the open-loop transfer function under each working condition; determining the weakest working condition of the new energy station grid-connected system based on the gain margin and the phase margin of the new energy station grid-connected system under each working condition; and under the weakest working condition, based on the gain margin and the phase margin of the new energy station grid-connected system under different numbers of inverters connected in parallel, the maximum capacity expansion number is determined. According to the method, accurate quantification of the capacity expansion limit is realized, the system stability is ensured, and the capacity expansion potential of the station is fully excavated.

The invention discloses a switching power supply loop compensation parameter debugging method and device. The method comprises the following steps: acquiring an initial resistance value of a series equivalent resistor, a first initial capacitance value of a series equivalent capacitor and a second initial capacitance value corresponding to a parallel equivalent capacitor, and setting a corresponding series resistor, a series capacitor and a parallel capacitor in a switching power supply loop according to the initial resistance value, the first initial capacitance value and the second initial capacitance value; carrying out Bode test on the switching power supply loop by using a loop analyzer to obtain a phase margin, a gain margin and a ride-through frequency; and sequentially adjusting the capacitance value of the shunt capacitor, the capacitance value of the series capacitor and the resistance value of the series resistor according to the phase margin, the gain margin and the ride-through frequency until the capacitance value of the shunt capacitor, the capacitance value of the series capacitor and the resistance value of the series resistor which meet the judgment standard of the Bode test are obtained. Through the mode, the optimal loop compensation parameter can be debugged.

The invention discloses a device and a method for evaluating the stability of a right leg driving loop for electroencephalogram acquisition, and belongs to the technical field of bio-electricity signal acquisition. The device comprises a signal triggering device, an injection signal generating device, a double-path acquisition device, a data processing unit and a configurable human body impedance simulation network. The method comprises the following steps: setting test parameters through an upper computer, and controlling an injection signal generator to inject a sweep frequency sinusoidal signal to a to-be-tested right leg driving loop; the double-path acquisition device synchronously acquires an injection point signal and a loop response signal; and the data processing unit performs Fourier transform on the signal, calculates open-loop amplitude-frequency and phase-frequency characteristics of a loop, and automatically calculates a phase margin and a gain margin to quantitatively evaluate the stability. According to the method, the problems of low precision, poor authenticity, poor repeatability and the like of the existing simulation and general instrument test method are solved, an electroencephalogram acquisition scene can be truly restored, and high-precision and automatic loop stability test is realized.

This invention discloses a calibration method, storage medium, and electronic device for a position servo control system. Specifically, it includes: determining the open-loop transfer function and open-loop gain of the position servo control system and drawing a first Bode plot accordingly; determining whether the gain margin and phase margin of the first Bode plot meet set requirements; if both the gain margin and phase margin of the first Bode plot meet set requirements, calibration is completed; otherwise, proceed to the next step; drawing the expected second Bode plot based on the set gain margin and phase margin requirements; determining a calibration function and its parameters based on the first and second Bode plots; and completing the calibration. In the solution provided by this invention, based on geometric processing, the difference between the first and second Bode plots is analyzed to determine the calibration scheme, reducing the amount of data processing and enabling calibration to be completed even without a computer.

The invention relates to a piezoelectric vibration isolator and a control system thereof, the piezoelectric vibration isolator comprises a shell unit, the shell unit comprises a shell and an end cover, one end of the shell is provided with an opening, and the end cover is detachably arranged in the opening; the bearing unit is arranged on the end cover, the bearing unit comprises a bearing platform and a first sensor assembly, the first sensor assembly is installed on the bearing platform, and the bearing platform is used for bearing a load; the middle mass unit is connected with the bearing platform, the middle mass unit is contained in the shell, the middle mass unit comprises a middle mass block and a second sensor assembly, and the second sensor assembly is installed on the middle mass block; and the passive vibration isolation unit is arranged in the shell, the passive vibration isolation unit is connected with the bearing platform, and the passive vibration isolation unit is further connected with the middle mass unit. The high vibration isolation efficiency can be obtained, the gain margin of the system is improved, and the stability of the system is improved.

A hearing device includes a microphone that produces an audio input signal and a loudspeaker that outputs an amplified audio signal into an ear canal. A signal processing path is coupled to the microphone and the loudspeaker. The signal processing path includes a deep neural network configured to predict an instantaneous gain margin of the hearing device based on a set of inputs. The set of inputs includes a first parameter of the audio input signal, a second parameter of the amplified audio signal, and a gain of the signal processing path. A feedback reduction module of the device receives the predicted instantaneous gain margin and adjusts feedback reduction parameters to reduce an onset of feedback in the hearing device.

The invention discloses a grid-connected inverter hybrid damping control method based on an LCLLC filter, passive damping adopts a mode that a filter capacitor is connected with a resistor in parallel, active damping adopts a state variable feedback mode, and a feedback variable is a filter capacitor current; a core model is a single-phase main circuit topological structure based on an LCLLC filter, and active damping parameters and current QPR controller parameters are designed through gain steady-state errors, gain margins and phase margins, so that the stability and control precision of a system in a full working condition range are ensured.

The application relates to the technical field of typical network configuration control, and discloses a stability domain adjustment method of a typical network configuration control strategy based on sequence impedance analysis, which aims to solve the shortcomings of a non-uniform stability domain framework, unclear MC control impedance characteristics, unclear parameter influence law and insufficient solution precision; the method establishes a control model of the typical network configuration control strategy, constructs a full-order small signal model based on small signal linearization disturbance processing, deduces a sequence impedance model in combination with the conversion relationship between positive and negative sequences and dq axis components, establishes a parameter-stability mapping relationship based on sequence impedance amplitude and phase characteristics in combination with gain margin and phase margin criteria, demarcates a stability domain range through two-dimensional parameter scanning and boundary fitting, and finally simulates and corrects the stability domain, so that the VSG control and the MC control stability domain can be accurately demarcated and compared horizontally, and the network configuration control parameter optimization and the power grid adaptability are improved.

A device having a crystal driver to operate according to a voltage transfer curve and a current reference to provide a current bias to the crystal driver to produce a voltage from the crystal driver within a linear region of the voltage transfer curve of the crystal driver, and to determining a gain margin of the crystal driver based on the measured first voltage on the driver output. A method to force a current bias from a current reference on a driver input, to measure the voltage on the driver output within a linear region of the voltage transfer curve of the crystal driver, and determine a gain margin of the crystal driver based on the measured voltage on the driver output.

A hearing device includes a microphone that produces an audio input signal and a loudspeaker that outputs an amplified audio signal into an ear canal. A signal processing path is coupled to the microphone and the loudspeaker. The signal processing path includes a deep neural network configured to predict an instantaneous gain margin of the hearing device based on a set of inputs. The set of inputs includes a first parameter of the audio input signal and a second parameter of the amplified audio signal. A feedback reduction module of the device receives the predicted instantaneous gain margin and adjusts feedback reduction parameters to reduce an onset of feedback in the hearing device

The invention discloses a design method of an uncertain IGBT electronic load controller, which relates to the technical field of electronic loads, and comprises the following steps: establishing a small signal model of an IGBT constant-current driving circuit, and decomposing the small signal model into an operational amplifier, a driving stage and an IGBT module to obtain an open-loop transfer function without compensation; combining a controller model and an uncompensated open-loop transfer function, analyzing structured and unstructured uncertainty, calculating a multiplicative uncertainty upper bound and determining a weighting function; and inputting the controller model, the uncompensated open-loop transfer function and the weighting function into a robust Bode diagram, verifying whether an open-loop frequency curve avoids a forbidden zone, adjusting a backstepping controller parameter through iteration, and outputting a qualified controller. According to the method, parameter fluctuation is modeled as structured uncertainty, actually measured gain offset is modeled as unstructured, and a robust stability weighting function is defined through multiplicative uncertainty boundary fusion, so that the gain margin of the controller to the gate and emitter parasitic capacitance change of the IGBT is improved.

A device having a crystal driver to operate according to a voltage transfer curve and a current reference to provide a current bias to the crystal driver to produce a voltage from the crystal driver within a linear region of the voltage transfer curve of the crystal driver, and to determining a gain margin of the crystal driver based on the measured first voltage on the driver output. A method to force a current bias from a current reference on a driver input, to measure the voltage on the driver output within a linear region of the voltage transfer curve of the crystal driver, and determine a gain margin of the crystal driver based on the measured voltage on the driver output.

The application discloses a series virtual impedance design method and system for a direct current power distribution system, and proposes a robust stability criterion: a frequency domain framework containing amplitude and phase constraints is constructed, and gain margin, phase margin and maximum peak sensitivity are converted into constraints on the phase-frequency curve of the equivalent output impedance of a converter. According to the amplitude-frequency curve of the equivalent input impedance of each load, two amplitude constraint curves are generated, and the intersection of the amplitude-frequency curve of the output impedance of the converter and the two amplitude constraint curves is used to demarcate a frequency interval, and then two phase constraint curves are used to define a phase forbidden zone in the interval. The system meets the criterion requirement that the phase-frequency curve of the output impedance does not pass through the forbidden zone. If the criterion requirement is not met, the application designs a control strategy based on a series virtual impedance, and gives a systematic compensation controller tuning method: a bandpass characteristic controller is designed, the center frequency and the gain coefficient are used as adjusting variables, and iteration optimization is performed to make the remodeled equivalent output impedance of the converter avoid the phase forbidden zone, so that the preset robust stability margin is ensured.