69 results about "Disturbance voltage" patented technology

The invention belongs to the technical field of artificial intelligence, and relates to an artificial intelligence-based electric energy quality disturbance identification and positioning method, which comprises the steps of constructing an electric energy quality disturbance signal data set, performing segmented preprocessing on electric energy quality disturbance voltage data, enhancing time-frequency joint features and encoding disturbance sensitive areas. And constructing a deep learning model for power quality disturbance identification and positioning, and identifying and positioning the power quality disturbance. According to the invention, through adaptive denoising processing, boundary detection and multi-resolution time-frequency feature extraction, the identification precision and positioning precision of power quality disturbance are significantly improved; self-adaptive wavelet denoising and dynamic segmentation are combined, noise interference is effectively suppressed, and the edge characteristics of voltage sudden change points are kept; according to the dual-task sharing network, disturbance identification and positioning tasks are cooperatively optimized, so that the network can consider disturbance classification and time positioning at the same time; and through Bayesian reasoning, the system can output confidence estimation, provides credibility quantification of identification and positioning results, and effectively improves the reliability of the system.

A high-density ferroelectric memory, and a preparation method therefor and an application thereof, belonging to the field of semiconductor memories. In the memory, multiple memory cells are arranged in an array, and the two sides of the array of the memory cells are connected to substantially orthogonal word lines and bit lines, the memory cell of the present invention adopts a stacked structure of a top electrode, a resistive switching dielectric layer, an intermediate metal layer, a ferroelectric dielectric layer, and a bottom electrode, which is electrically equivalent to a ferroelectric capacitor and a resistive switching selector connected in series; the voltage division of the distributed ferroelectric capacitor in the unselected cells is reduced by regulating the RC delay of the memory cell, so that its disturbance is reduced; and the capacitance value of the ferroelectric capacitor is stable, and the influence of the disturbance voltage can be effectively reduced by RC regulation. The storage window of the memory is improved and the bit error rate is reduced, without increasing additional area overhead.

The invention discloses a doubly-fed induction generator fault detection method combining a sliding-mode observer and a bilateral cumulative sum algorithm, and the method comprises the following steps: designing a doubly-fed induction generator rotor current sliding-mode observer based on the combination of a novel reaching law and a doubly-fed induction generator state equation; carrying out stability and convergence analysis on the designed novel reaching law by adopting a Lyapunov stability theory; and the fault detection method of the doubly-fed induction generator is designed in combination with the optimized bilateral accumulation sum algorithm. A rotor current sensor fault, an input interference voltage fault, a voltage drop fault and a stator turn-to-turn short circuit fault are introduced. The rotor current tracking performance of the designed sliding-mode observer under different doubly-fed induction generator faults is verified by using a residual value obtained by comparing a doubly-fed induction generator rotor current value estimated by the sliding-mode observer with an actual rotor current output value; and meanwhile, the reliability of the designed doubly-fed induction generator fault detection method based on the optimized bilateral cumulative sum algorithm is verified. The doubly-fed induction generator fault detection method combining the sliding-mode observer and the bilateral cumulative sum algorithm has the advantages of being high in tracking precision and accurate in fault state characterization, meanwhile, weak fault features can be effectively converted into digital signals to be output, and faults of the doubly-fed induction generator are detected.

The invention discloses a dual-frequency positive-sequence impedance modeling method for a network-building type energy storage converter considering frequency coupling. The method comprises the following steps: 1, injecting a dual-frequency positive-sequence disturbance voltage signal at a grid-connected point of the network-building type energy storage converter based on a virtual synchronous machine; 2, establishing a linearized small signal model for each control link of an active-frequency loop, a reactive-voltage loop, a virtual impedance-containing voltage and current double closed loop and the like to form a multi-frequency signal model; and 3, according to the multi-frequency coupling relationship between the current and the voltage, constructing a frequency coupling impedance matrix, and reducing a coupling term into output impedance to obtain the positive sequence output impedance and the negative sequence output impedance of the converter considering the frequency coupling, thereby simplifying the model stability analysis. According to the method, dual-frequency positive sequence disturbance is introduced, the coupling effect between different frequency components is effectively described, the defect that a traditional single-frequency modeling method cannot reflect the multi-frequency interaction characteristic is overcome, and the accuracy and applicability of the impedance model of the network construction type energy storage converter under the multi-frequency disturbance scene are remarkably improved.

The invention relates to the field of servo drive control, and provides a self-adaptive control method and system for a high-frequency response current loop of a servo drive system, and the method comprises the steps: collecting an instantaneous state vector set, constructing an input graph snapshot, and fusing a loss item to output a thermal coupling graph neural network model; a current loop total delay and coupling torque model is identified through a parameter and dynamics identification decoder, a next cycle parameter is predicted by combining a future motion instruction, and a composite disturbance voltage set is mapped and output; according to the reference current, the rotating speed, the motor parameter set and the composite disturbance voltage set, outputting feed-forward compensation voltage; calculating a current tracking error, comparing a stability margin and a safety threshold, calculating a feedback control voltage component, superposing a feedforward compensation voltage to synthesize a total instruction voltage, and applying dynamic amplitude limiting to output a safety voltage instruction set. According to the method, thermal-mechanical coupling identification prediction of physical prior and adaptive feedback amplitude limiting of stability margin are fused, and prediction feedforward and stability constraint feedback combined control is constructed.

The application provides a power system stability analysis method based on impedance measurement data, comprising determining that the current analysis condition is a condition corresponding to an equivalent circuit diagram based on a converter topology structure diagram, wherein a disturbance voltage source is in series or a disturbance current source is in parallel; under the current analysis condition, disturbance voltage components and disturbance current components generated on the converter side are obtained to obtain converter impedance measurement data carrying amplitudes and phase angles at several frequency points, and disturbance voltage components and disturbance current components generated on the power grid side are obtained to obtain power grid equivalent impedance measurement data carrying amplitudes and phase angles at several frequency points; the converter impedance measurement data and the power grid equivalent impedance measurement data at the same frequency point are compared, and according to each comparison result, the risk of oscillation instability of the power system is judged. The application is implemented to reduce the complexity of impedance measurement operation, thereby improving the analysis accuracy.

The invention discloses a voltage sampling method, a source-load all-in-one machine, a device, equipment and a medium, and the method comprises the steps: obtaining initial voltage sampling data and sampling circuit parameters of the source-load all-in-one machine, inputting a sampling resistor precision deviation value and a sampling resistor voltage division ratio of each phase into an interference voltage precision deviation model, obtaining an interference voltage precision coefficient of each phase; calculating according to the initial voltage sampling data and the interference voltage precision coefficient of each phase to obtain the common-mode interference voltage of each phase; calculating a voltage compensation amount corresponding to each phase according to the common-mode interference voltage of each phase; and compensating the initial voltage sampling data according to the voltage compensation amount of each phase to obtain first target voltage sampling data. The voltage sampling precision of the source-load all-in-one machine can be improved.

The invention discloses a method and a device for determining interference information of a cable line on a buried oil and gas transportation pipeline. The method comprises the following steps: acquiring cross-correlation parameters of a cable line and a buried oil and gas transportation pipeline; topological information and cross laying areas corresponding to the cable line and the buried oil and gas transportation pipeline are obtained; generating an electromagnetic interference simulation model according to the cross-correlation parameters, the cross laying area, the anticorrosive layer resistivity and the topological information; electromagnetic influence parameters of different working conditions of the cable line on the buried oil and gas transportation pipeline are determined according to the model; and determining interference current information and interference voltage information of the cable line on the pipeline according to the electromagnetic influence parameters, thereby solving the problems that when the high-voltage transmission line and the buried oil-gas transportation pipeline approach or intersect in the related technology, the power transmission line can sense interference voltage and current on the buried oil-gas transportation pipeline under normal operation and various fault conditions; and hidden dangers are easily caused to the safety of personnel, pipelines and related equipment when the safety limit value is influenced or exceeded for a long time.

The application discloses a method and device for determining interference information of a cable line on a buried oil and gas pipeline. The method comprises: obtaining mutual correlation parameters of the cable line and the buried oil and gas pipeline; obtaining corresponding topological information and cross-laying areas of the cable line and the buried oil and gas pipeline; generating an electromagnetic interference simulation model according to the mutual correlation parameters, the cross-laying areas, the corrosion layer resistivity and the topological information; determining electromagnetic influence parameters of different working conditions of the cable line on the buried oil and gas pipeline according to the model; and determining interference current information and interference voltage information of the cable line on the pipeline according to the electromagnetic influence parameters, thereby solving the problem that in the related art, when a high-voltage transmission line is close to or crosses a buried oil and gas pipeline, the power transmission line will induce interference voltage and current on the buried oil and gas pipeline under normal operation and various fault working conditions, which will long-term affect or exceed the safety limit, and easily cause hidden dangers to the safety of personnel, the pipeline and related equipment.

The invention relates to the technical field of model construction, and particularly discloses a 100GNRZ direct dimming anti-lightning stroke SOP scrambling voltage model construction method based on deep learning, and the method comprises the following steps: S1, collecting the bias voltage, modulation depth, SOP scrambling data and environmental parameters of a thin film lithium niobate modulator in a simulated lightning stroke environment to construct a data set; s2, performing normalization and noise filtering on the data, extracting correlation characteristics of bias voltage and modulation depth and time sequence characteristics of SOP scrambling by adopting a CNN-LSTM hybrid network, and introducing physical characteristics of a modulator as constraints; s3, taking SOP tolerance maximization and photoelectric loss minimization as targets, and training the model through an adaptive gradient descent algorithm to obtain an anti-lightning model; and S4, deploying the model to 100GNRZ direct modulation light transmission equipment, and dynamically generating an optimal bias voltage for compensation by monitoring equipment parameters in real time.

This application discloses a current loop control method, related devices, and a permanent magnet synchronous motor (PMSM), relating to the field of motor control. By feeding forward a disturbance voltage characterizing the voltage change caused by parameter variations in the PMSM, an ideal stator current equation is obtained. The transfer function of the PMSM is obtained by combining the vector expressions of stator voltage and stator current in an orthogonal coordinate system. The first current loop transfer function is determined by combining the first controller transfer function. The coefficient values ​​of each control element are determined by tuning the first current loop transfer function. Then, based on the obtained second controller transfer function and the compensation term for the current loop delay, a control voltage calculation model corresponding to the target coordinate axis is determined. The first control voltage is determined based on the control voltage calculation model and fused with the disturbance voltage to obtain the final control voltage. This achieves high-precision current decoupling control of the PMSM, improving control accuracy and efficiency.

The application relates to a kind of based on network topology feature mapping's flexible straight multi-feeding system small disturbance voltage stability analysis method and system, the method comprises: the network equivalent model of receiving terminal power grid containing multiple flexible direct current feeding is constructed;Based on the network equivalent model of receiving terminal power grid, using Kron reduction method, the voltage Jacobian matrix embedded with active power distribution is obtained;Based on the voltage Jacobian matrix, define dynamic power disturbance graph, and based on the dynamic power disturbance graph, construct weighted laplacian matrix;The weighted laplacian matrix is extended to extended graph laplacian matrix by contract transformation proof, and small disturbance voltage stability is judged based on the extended graph laplacian matrix.Compared with prior art, the application solves the problem that existing modal analysis method is difficult to reveal the global influence of network topology structure and active power distribution on voltage stability, and cannot explain the voltage and power angle dynamic coupling mechanism from the graph theory point of view.

This invention relates to a current bias error compensation method for dual three-phase permanent magnet synchronous motors, addressing the problem of real-time and effective compensation for DC offset errors generated during current measurement. It falls within the field of motor drives. The invention derives a voltage equation considering current sampling errors in a stationary coordinate system, where the offset error of the current sensor manifests as a DC component. The method comprises two cascaded components: an adaptive state observer and a closed-loop compensator. The adaptive state observer estimates the DC offset, while the closed-loop compensator eliminates errors caused by inaccurate motor parameters. Specifically, by introducing the adaptive state observer into the subspace and harmonic subspace of the stationary coordinate system, the system disturbance voltage is estimated in real time. The sampling error current is then derived by inversely solving the physical relationship between the disturbance voltage and the current error, and subtracted from the sampled value using a feedforward method, thereby achieving high-precision current compensation.

The application discloses a grid-connected converter stability analysis system and method based on embedded working point modeling, and the system comprises a GFM-GCC linearization model, a converter impedance model and a stability analysis module; the method comprises the following steps: taking grid-connected small disturbance current in an actual coordinate system as input, and corresponding outputting PCC point small disturbance voltage in the actual coordinate system after disturbance; ignoring power reference value disturbance, obtaining GFM converter port impedance according to and ; and analyzing the stability of the grid-connected converter GFM-GCC control.

The invention discloses a DIMM module test circuit, device and method, and relates to the field of DIMMs, and the DIMM module test circuit comprises a noise voltage generation module which is used for generating PMIC input noise voltage and PMIC output noise voltage; the second input end of the first noise voltage output module is connected with the first noise voltage output end, and the first noise voltage output module is used for generating input disturbance voltage and outputting the input disturbance voltage to the PMIC to be tested after the PMIC standard input voltage accessed by the PMIC standard input voltage access end is interfered according to the PMIC input noise voltage; the second input end of the second noise voltage output module is connected with the second noise voltage output end, and the second noise voltage output module is used for generating output disturbance voltage to the to-be-tested DRAM after the DRAM power supply voltage output by the to-be-tested PMIC is interfered according to the noise voltage output by the PMIC. According to the invention, the change conditions of the input voltage and the output voltage in a complex and changeable scene in reality can be simulated.

The invention discloses an interference suppression circuit and a low dropout regulator, and a unity gain amplifier is used for performing unity gain phase reversal processing on an interference voltage signal of an input voltage accessed by the low dropout regulator so as to output a compensation voltage signal of which the polarity is opposite to that of the interference voltage signal. The compensation voltage signal is coupled to the reference voltage accessed to the grid electrode of the first differential MOS tube through the compensation capacitor, so that the interference voltage signal at the grid electrode of the first differential MOS tube is counteracted with the compensation voltage signal. On the basis, when noise exists in the input voltage and an interference voltage signal is coupled to the grid electrode of the first differential MOS tube, the compensation voltage signal is coupled to the grid electrode of the first differential MOS tube through the unity gain amplifier and the compensation capacitor so as to offset the interference voltage signal; the influence of noise in the input signal on the reference voltage is avoided, and then the stability of the output voltage adjusted based on the reference voltage is improved.

The invention relates to a transient electromagnetic interference voltage determination method and device, equipment and a medium, and the method comprises the steps: building a field-circuit cooperation model based on a video monitoring system and the parameter information of a cable connected with the video monitoring system; based on the field-circuit cooperation model, obtaining a first interference voltage coupled to a video monitoring system port by space radiation; constructing a multi-conductor transmission line system model based on the transformer substation earth screen and shielding cable simulation model; based on the multi-conductor transmission line system model, acquiring a second interference voltage of the line which is conductively coupled to the video monitoring system port; and superposing the first interference voltage and the second interference voltage to obtain the transient electromagnetic interference voltage of the video monitoring system port. By adopting the method, the problem that the transient electromagnetic interference voltage cannot be accurately determined in the prior art can be solved.

The application discloses a cable conductor AC resistance testing device and method, which directly supplies a large current to a cable conductor, measures the temperature, current and voltage of the powered cable conductor, adopts the measured data and a function relationship between the interference voltage value and the cable conductor radius which is fitted in advance, and obtains the cable conductor AC resistance, so that the reverse current is not applied to the cable metal shielding layer, and the proximity effect between the cable conductor and the shielding layer is avoided to influence the test result.

The invention provides an electromagnetic interference suppression method in the electrifying process of an electric connector. Comprising the following steps: starting a multi-parameter monitoring module to collect grounding impedance, temperature variation, working frequency and a multi-core crosstalk coupling coefficient when the electric connector works; quantifying the total interference voltage of the electric connector through an interference coupling calculation module based on the acquired grounding impedance, temperature variation, working frequency and multi-core crosstalk coupling coefficient; a self-adaptive offset phase is calculated through a self-adaptive phase offset circuit according to the quantized total interference voltage, and an adjustable inductor is adjusted to realize phase offset of interference; the shielding effectiveness is corrected through the grounding-phase correction shielding layer according to the calculated self-adaptive offset phase and the collected grounding impedance, and the interference suppression stability can be ensured in a high-frequency scene.

The invention relates to the technical field of motor control, in particular to a low-speed large-torque control method and system for an industrial robot joint motor, and the method comprises the steps: collecting the voltage of a DC bus, each phase of current of a stator, and the position and rotating speed of a rotor, and carrying out the coordinate transformation of each phase of current of the stator according to the position of the rotor; obtaining d-axis current and q-axis current of the synchronous rotating coordinate system; solving a stator flux linkage estimation value and an electromagnetic torque estimation value according to the d-axis current, the q-axis current and preset motor parameters, and generating a torque error and a flux linkage error; the torque error passes through a torque regulator to obtain a load angle instruction, and the flux linkage error and the rotating speed pass through a flux linkage regulator to obtain a voltage vector amplitude instruction and a voltage vector angle instruction; generating a d-axis voltage instruction and a q-axis voltage instruction; constructing an inverter nonlinear voltage disturbance estimation model, defining d-axis disturbance voltage and q-axis disturbance voltage as disturbance voltage states, and merging the disturbance voltage states into an extended Kalman filtering state space model; executing extended Kalman filtering prediction and correction to obtain a d-axis disturbance voltage estimated value and a q-axis disturbance voltage estimated value; forming a voltage compensation amount and superposing the voltage compensation amount to obtain a compensation voltage instruction; driving pulses are generated through inverse coordinate transformation and space vector modulation, and low-speed large-torque online compensation is achieved. According to the invention, the problems that the output pole voltage of the joint motor of the industrial robot has unexpected distortion and further shows control nonlinearity and the distortion voltage is difficult to directly sense and measure can be solved.

The application provides a grid-connected converter broadband oscillation monitoring device and a monitoring method, and belongs to the field of oscillation monitoring of power systems. The device comprises a disturbance voltage injection module, a response current measurement module, a converter impedance calculation module, a system stability interval and instability interval generation module, and a converter impedance and line impedance vector calculation module. The disturbance voltage injection module is used for injecting a disturbance voltage into a grid-connected point. The response current measurement module is used for measuring a response current generated by the injected disturbance voltage. The converter impedance calculation module is used for receiving the disturbance voltage and the response current, and calculating an equivalent output impedance. The system stability interval and instability interval generation module is used for judging a system stability interval and an instability interval according to the equivalent output impedance. The converter impedance and line impedance vector calculation module is used for calculating a combined impedance phase according to the equivalent output impedance and a line impedance. The stability discrimination module is used for combining the impedance phase, and calculating an oscillation analysis result. The device only needs to use simple vector addition operation processing to monitor the operation state of the system, has a wider application range, and is more accurate.

The present application relates to a kind of two-level four-bridge converter common-mode voltage suppression PWM dead-time compensation method, comprising: obtaining the current duty cycle of each phase bridge arm of two-level four-bridge converter, current output current value and circuit parameter;According to the current duty cycle of each phase bridge arm, current output current value and current circuit parameter, the instantaneous current value of each phase bridge arm switch action time in next cycle is predicted;Based on the absolute value of the instantaneous current value of each phase bridge arm switch action time in next cycle, target bridge arm is selected, and disturbance voltage is injected to target bridge arm, and bridge arm current is biased, so that the instantaneous current value of each phase bridge arm switch action time is greater than preset current threshold, and according to the current direction corresponding to the instantaneous current value of each phase bridge arm switch action time, dead-time compensation is carried out.Therefore, the dead-time compensation method based on the common-mode voltage suppression PWM of four-bridge solves the problem that common-mode voltage suppression PWM is ineffective due to dead-time effect.Improve the safety and stability of system.

The application discloses an outdoor unit and an air conditioner, wherein the outdoor unit comprises: a rectifier circuit receiving an alternating current power supply and used for outputting a rectified voltage; a PFC circuit connected to an output end of the rectifier circuit and used for outputting a bus voltage; a thin film capacitor used for ensuring stability of the bus voltage; a driving unit receiving the bus voltage and used for driving a load of the frequency converter circuit; an isolation transformer comprising a primary side and a secondary side, the primary side receiving an alternating current power supply at a front end of the rectifier circuit, and a transformation ratio of the primary side and the secondary side is greater than 1; and a power conversion unit having an input end connected to the secondary side and used for converting the alternating current power supply of the secondary side into a direct current power supply, the direct current power supply providing a required voltage for a chip on the outdoor side. The application can reduce an interference voltage of an outdoor substrate to ground and improve outdoor communication quality when a thin film capacitor is used on a main loop of the outdoor unit.

This invention provides an online impedance measurement device and method for weak grids based on an energy storage-type intelligent soft switch. The device includes an energy storage-type intelligent soft switch, a measuring device, and auxiliary equipment for injecting multi-sinusoidal voltage signals into the equipment-side inverter. The energy storage-type intelligent soft switch includes an equipment-side inverter and a grid-side inverter symmetrically connected on both sides of a DC bus, and an energy storage module connected to the DC bus. The measuring device is used to obtain a control signal based on grid-side connection point data and the fundamental frequency, and to obtain a first harmonic impedance amplitude by combining the energy storage module and the grid-side inverter. It is also used to obtain a disturbance voltage signal based on the multi-sinusoidal voltage signal, the fundamental frequency, and equipment-side connection point data, and to obtain a second harmonic impedance amplitude by combining the energy storage-type intelligent soft switch and the first harmonic impedance amplitude. This device has dual-mode measurement capability for parallel current and series voltage, and can simultaneously identify the broadband coupling impedance characteristics on both sides of the source-load, realizing real-time monitoring and identification of broadband disturbance response.

The invention discloses a control method and device of an energy storage converter, a storage medium and electronic equipment, and relates to the field of power systems, and the method comprises the steps: determining the voltage transient change data of a power grid according to the voltage fluctuation information of the power grid; determining a current reference value of a direct axis and a current reference value of a quadrature axis according to the voltage transient change data; according to the deviation between the current reference values of the direct axis and the quadrature axis and the actual current measurement value, control voltages corresponding to the direct axis and the quadrature axis respectively are determined; acquiring current state feedback quantities respectively corresponding to the direct axis and the quadrature axis and power grid disturbance voltage items respectively corresponding to the direct axis and the quadrature axis; and controlling the power output of the energy storage converter according to the control voltages respectively corresponding to the direct axis and the quadrature axis, the current state feedback quantities respectively corresponding to the direct axis and the quadrature axis, and the power grid disturbance voltage items respectively corresponding to the direct axis and the quadrature axis. The problem that in the prior art, voltage transient support is insufficient due to the fact that high-proportion distributed photovoltaic is connected into a county power distribution network is solved.

The utility model discloses an IEPE-based full-link signal acquisition optimization circuit, which comprises a protection filter circuit, a constant current source adjustable circuit, an operational amplifier circuit, an active low-pass filter circuit, a voltage follower circuit and a differential operational circuit, the protection filter circuit, the operational amplifier circuit, the active low-pass filter circuit, the voltage follower circuit and the differential operational circuit are electrically connected in sequence, the constant current source adjustable circuit is connected to the protection filter circuit, the protection filter circuit is used for being electrically connected with an IEPE signal interface, and interference of effective signals is inhibited through a constructed three-level protection filter system. The voltage follower circuit guarantees the integrity of effective signals through high input impedance and low output impedance. According to the utility model, full-link collaborative optimization is carried out on an IEPE signal acquisition system, the transmission quality and integrity of signals are effectively improved, and the stability and anti-interference performance of the system are enhanced.

The invention provides a method and a device for acquiring harmonic equivalent impedance of a modular multilevel matrix converter. The method comprises the following steps: defining positive sequence impedance and negative sequence impedance of an M3C in a three-phase symmetric operation state; applying a voltage disturbance in a set range of an M3C steady-state working point, and calculating a bridge arm reference voltage disturbance harmonic wave caused by the voltage disturbance in a dq coordinate system; obtaining a phasor form of a bridge arm reference voltage disturbance harmonic wave under an abc coordinate system through coordinate transformation; establishing a KCL equation for a bridge arm connecting the power frequency side and the low frequency side and carrying out linearization processing to obtain a disturbance voltage generated after the disturbance current is responded by the controller; simplifying a bridge arm voltage and current relation based on the disturbance voltage to obtain a unified disturbance voltage vector and disturbance current expression; and on the basis of the disturbance voltage vector, the current expression, the positive sequence impedance and the negative sequence impedance, the M3C positive sequence impedance seen from the power frequency side and the low frequency side is obtained through derivation by adopting per unit values.

The invention provides a network construction type energy storage locating and sizing method considering the voltage stability improvement of a receiving end power grid, and belongs to the technical field of network construction type energy storage planning. The method comprises the following steps: constructing a receiving end power grid total factor simulation model; constructing an optimization model taking the minimization of the total investment cost of the constructed network type energy storage as a target function; constructing constraint conditions of the optimization model according to a small disturbance voltage stability margin constraint, a large disturbance voltage recovery characteristic constraint, and a site selection constraint and a capacity constraint of network construction type energy storage; performing linearization processing on nonlinear terms in the optimization model by using a support function relaxation algorithm; solving the optimization model, obtaining a site selection result and a capacity result of the network construction type energy storage, and checking a relaxation error; and verifying the site selection result and the capacity result by using the simulation model, and if the voltage stability of the receiving-end power grid does not meet a preset requirement, adjusting parameters of the optimization model, and performing solution again. The method can accurately quantify the improvement effect of the network construction type energy storage on the voltage stability of the receiving end power grid.

This invention relates to the field of automatic control technology, and more specifically, to a constant-speed output control method for a magnetic drilling motor based on dynamic current feedback. The magnetic drilling motor is an embedded permanent magnet synchronous motor driven by a three-phase inverter. The method includes the following steps: Step 1: Simultaneously setting a tunnel reluctance current sensor and a PCB-embedded Rogowski coil on each power bridge arm of the three-phase inverter; Step 2: Constructing a fractional-order extended state observer based on the reconstructed quadrature-axis voltage value reconstructed according to the DC bus voltage and the space vector pulse width modulation duty cycle, and outputting a speed feedback signal and an equivalent disturbance voltage compensation signal; Step 3: The speed control loop generates a quadrature-axis current reference value based on the difference between the speed setpoint and the speed feedback signal, thereby achieving constant-speed output control of the magnetic drilling motor. This invention reduces unnecessary heat generation and energy loss, and extends the continuous operation time of the equipment.

The utility model discloses a port anti-interference level circuit, which comprises a photoelectric coupler, the primary side of the photoelectric coupler is connected with a control signal end and a grounding end, the primary side of the photoelectric coupler is connected with a voltage-regulator tube to realize high / open control or ground / open control, and the secondary side of the photoelectric coupler outputs a driving signal; according to the utility model, conventional devices can be applied to improve the anti-interference capability of a discrete drive circuit port and a control signal threshold value, so that the circuit is prevented from working under interference, the circuit is prevented from being abnormal due to interference voltage peak starting in a system, and the circuit is ensured to work safely, reliably and normally when a drive control signal reaches a certain level; the method is suitable for discrete magnitude control circuit ports.