201 results about "Active filter" patented technology

The invention discloses a main power grid short-time load prediction method using a hybrid active filter, and particularly relates to the technical field of load prediction. The method comprises the following steps: acquiring active control parameters and passive branch parameters of a hybrid active filter, combining a real-time load fluctuation signal of a main power grid, extracting harmonic suppression characteristics and phase distortion characteristics, and analyzing and generating a time scale compensation factor through a dynamic coupling effect; and constructing a phase correction model based on the transient harmonic residual component and the time scale compensation factor, and performing frequency domain and time domain combined reconstruction on the real-time load fluctuation signal to obtain a corrected load fluctuation characteristic sequence. A short-time load prediction model is calibrated through a collaborative mapping relation, a load power prediction value of a main power grid in a future preset time window is output, a secondary high-frequency interference signal generated by real load fluctuation and filter self-resonance is effectively distinguished, and the problem of coupling interference of harmonic residual components on the load prediction model in a power grid impedance sudden change scene is solved.

The invention relates to the technical field of reactive power compensation of a power system, and discloses an active filter harmonic suppression and dynamic compensation system based on IGBT (Insulated Gate Bipolar Translator) multi-mode regulation and control. The system comprises a control module; the high-frequency harmonic detection module is electrically connected with the control module and is configured to detect a power grid harmonic signal in real time at a sampling rate of 200kHz and transmit the power grid harmonic signal to the control module; the IGBT gate driving compensation circuit is electrically connected with the control module and a preset IGBT module, and the control module dynamically adjusts the dead time and the switching frequency of the IGBT module through the IGBT gate driving compensation circuit; the IGBT junction temperature observer is electrically connected with the IGBT module and the control module and is configured to monitor the junction temperature of the IGBT module in real time and trigger the control module to start a derating protection mechanism when the junction temperature exceeds 125 DEG C; wherein the control module generates a PWM (Pulse Width Modulation) compensation waveform through a model prediction control algorithm unit based on a detection signal of the high-frequency harmonic detection module, so as to drive the IGBT module to execute harmonic compensation through the IGBT gate driving compensation circuit.

The invention provides a hysteresis loop analysis method for a transformer no-load loss test, and belongs to the technical field of transformers. Exciting voltage and current signals are collected in a transformer no-load state, and an active filter is used for carrying out digital filtering processing to eliminate harmonic interference; a data corresponding relation between magnetic flux density and magnetic field intensity is established through a digital integration algorithm and a magnetic field intensity calculation formula to form original hysteresis data, the original hysteresis data is processed by using a hysteresis loop optimization model, a complete hysteresis loop curve is generated, and the hysteresis loop area is calculated. According to the hysteresis loop area, the hysteresis loss power density is calculated through the iron loss calculation function, the total value of the transformer no-load loss is obtained by combining the eddy current loss calculation result, and the technical problems that the hysteresis loop reconstruction precision is not high and the complex hysteresis phenomenon cannot be adapted in the transformer no-load loss test are solved.

The invention discloses a multi-level pulse compensation type active EMI (Electro-Magnetic Interference) filter suitable for a multi-noise source switching power supply and a control method of the multi-level pulse compensation type active EMI filter. The invention provides a multi-level pulse compensation scheme based on switch behavior modeling, aiming at the problem of common-mode noise of adjacent rising edges and falling edges generated by a high-frequency switch in a multi-noise-source switching power supply. The time sequence delay and the edge slope of the compensation signal are calculated by analyzing the dv / dt characteristics in the switching-on and switching-off processes of the switching device, and accurate matching and offset with a noise source in phase and amplitude are achieved. Compensation control logic is realized by sharing a main control chip with a power circuit, and an additional controller and a high-precision sampling system are not needed; the self-adaptive tracking of the compensation amplitude is realized through the voltage following circuit; a multi-level compensation signal is output through the totem-pole circuit and injected into a common-mode path, and effective suppression of electromagnetic interference is achieved. The converter has the advantages of small size, low cost, simplicity and convenience in installation, high stability and the like, and is suitable for various multi-noise-source power electronic systems including a dual-active bridge converter, a phase-shifted full-bridge converter and an interleaving Buck converter.

The invention provides an electric energy quality treatment method, system and device based on a charging pile and a medium, and belongs to the technical field of charging piles, and the method is realized through the following steps: employing a mutual inductor to collect three-phase voltage / current; a common analog sampling and DSP processing circuit; harmonic / reactive power is identified based on the instantaneous reactive power theory, and a compensation instruction is generated; according to the compensation control instruction, driving an active filtering inverter circuit to inject compensation current into a power grid so as to reduce the total harmonic current content and improve the power factor; and the main controller generates charging state data according to the sampled voltage signal and current signal, and couples the data to an alternating current power line for transmission through the power line carrier communication module. The system guarantees the quality of the power grid, achieves the high efficiency and reliability of the operation of the charging pile, and gives consideration to the safety of the power grid and user experience.

The invention discloses an intelligent power regulation system and method for a power distribution cabinet, and relates to the technical field of power regulation of the power distribution cabinet, and the method comprises the steps that a multi-source sensing unit carries out the early warning of harmonic overrun and local overheating risks in advance according to the collected three-phase current, three-phase voltage and harmonic components, and a temperature distribution matrix and external data generated by a thermal infrared imager; the edge prediction unit operates the LSTM-CNN-GRU hybrid neural network model to generate a future load prediction value, and stabilizes the voltage in advance; and the impedance self-adaptive execution unit enables the vibration value of the motor to be within a safety threshold value through the capacitor bank with the reconfigurable topology, the threshold value trigger type active filter and the tap switch controller according to the received optimization instruction.

A high-speed, low-noise laser signal detection apparatus, comprising a low-noise linear regulated power supply and a laser detection processing module. The low-noise linear regulated power supply (01-03) comprises an isolation unit (01), a voltage regulation and filtering unit (02), and a reference unit (03). The laser detection processing module (04-09) comprises a laser light signal detection input unit (05), a bias unit (04), a differential amplification unit (07), an active filtering unit (08), and an output interface unit (09). An output end of the voltage regulation and filtering unit (02) is connected to the reference unit (03) and the laser detection processing module (04-09). The reference unit (03) is connected to the bias unit (04) and is configured to provide a reference voltage to the bias unit (04). The bias unit (04) is configured to provide a bias voltage to the differential amplification unit (07). The differential amplification unit (07) comprises a multi-stage in-phase proportional differential amplification circuit, and the active filtering unit (08) comprises a multi-order active low-pass filter. According to the high-speed, low-noise laser signal detection apparatus, the detection bandwidth of a laser signal can be expanded, the signal-to-noise ratio of high-frequency pulse measurement can be reduced, and the anti-interference characteristics of a power supply can be improved.

Wireless circuitry can include a first filter circuit configured to output signals in a first frequency range, a second filter circuit configured to output signals in a second frequency range different than the first frequency range, and a signal combiner having a first input coupled to the first filter circuit and having a second input coupled to the second filter circuit. The wireless circuitry can further include a first switchable impedance matching circuit coupled between an antenna and the first filter circuit and a second switchable impedance matching circuit coupled between the antenna and the second filter circuit. The first and second filter circuits can be active filters such as lowpass-to-bandpass conversion filters operable in different frequency bands.

The invention relates to the technology of power electronics and electric energy quality control, in particular to an energy storage type UPQC and switch state prediction control method based on improved model prediction control, which comprises a series active filter, a parallel active filter, a direct current bus, an energy storage system and a controller, according to the control method, an energy storage power and charge state dynamic equation is introduced into an MPC prediction model, and a multi-objective cost function is designed. And the controller predicts and evaluates the candidate switching vector in each sampling period based on a finite control set model predictive control strategy, and outputs an optimal switching state through value function optimization, thereby realizing collaborative optimization of electric energy quality management and energy storage energy management. According to the method, the dynamic response capability and compensation precision of the UPQC under the working conditions of voltage sag / sag, imbalance, harmonic waves and load fluctuation are remarkably improved, meanwhile, the energy storage utilization efficiency and the system stability are improved, and the method is suitable for a power distribution network with new energy high permeability and large load fluctuation.

The invention relates to a precise data acquisition device of a lightning arrester on-line monitoring system, and the device comprises a sensor unit which is used for obtaining a three-phase leakage current signal of a lightning arrester and a voltage signal of a corresponding phase in real time; a signal conditioning unit; a micro-current amplification circuit; a dynamic gain control circuit; a multi-stage active filter circuit; an electromagnetic shielding housing; a synchronous sampling unit; a data processing unit; a self-energy-taking power supply unit; and an intelligent communication unit. The beneficial effects are that through the high-linearity current transformer and the partial pressure type voltage sensor of the sensor unit, three-phase leakage current signals and corresponding-phase voltage signals of the lightning arrester can be accurately obtained; a micro-current amplification circuit, a dynamic gain control circuit and a multi-order active filter circuit in the signal conditioning unit work cooperatively, weak leakage current signals are effectively processed, the signal-to-noise ratio is improved, and it is ensured that the signals can still keep high precision in a complex electromagnetic environment.

Wireless circuitry can include a first filter circuit configured to output signals in a first frequency range, a second filter circuit configured to output signals in a second frequency range different than the first frequency range, and a signal combiner having a first input coupled to the first filter circuit and having a second input coupled to the second filter circuit. The wireless circuitry can further include a first switchable impedance matching circuit coupled between an antenna and the first filter circuit and a second switchable impedance matching circuit coupled between the antenna and the second filter circuit. The first and second filter circuits can be active filters such as lowpass-to-bandpass conversion filters operable in different frequency bands.

The invention relates to the field of power grid state evaluation, discloses a power grid state evaluation method and system based on a high-capacity high-voltage active filtering structure, and realizes breakthrough in the fields of economic quantification of harmonic suppression, dynamic risk evaluation, multi-party collaborative decision, data security and the like through interdisciplinary fusion. According to the method, the multi-dimensional data of the active filter is obtained, processing and analysis are carried out by utilizing advanced technologies such as quantum calculation, results such as a quantum risk thermodynamic diagram, an equipment health degree attenuation curve and a Nash equilibrium decision path are generated, and scientific decision support is provided for power grid enterprises, users and supervision organizations. Meanwhile, an anti-interference asset configuration table is coded into a photon orbital angular momentum state, data topology protection is achieved through an optical annular cavity, and a quantum anti-counterfeiting supervision report with anti-counterfeiting performance and traceability is generated.

The invention relates to the technical field of low-voltage direct-current power supply, and discloses a direct-current active filtering method and system based on a three-level topological connection low-voltage direct-current power supply system. Firstly, a three-level topological active filter is connected with the low-voltage direct-current power supply system in parallel, so that the voltage stress of a switching tube is reduced; reference voltages under different working conditions are dynamically generated through a preset working condition proportionality coefficient, the compensation capacitor voltage can be more accurately adjusted, the compensation precision is improved, a processing mode of firstly adopting a proportional resonance controller and then adopting a proportional controller is adopted, so that the active filter more effectively suppresses various ripple components, and finally, the active filter can be effectively controlled. The three-level topological active filter can drive the switching tube to be switched on and switched off according to different modulation results, the filter inductor is flexibly controlled to generate the compensation current, finally, the compensation current injected into the low-voltage direct-current power supply system can be more effectively subjected to ripple filtering, and the ripple suppression capacity in the system is remarkably improved.

The application discloses a new energy automobile high-voltage bus temperature control active filter, and relates to the technical field of new energy automobiles, which comprises a filtering mechanism, an auxiliary mechanism is arranged in the main shell, the auxiliary mechanism comprises a micro high-pressure pump and a liquid storage tank, each liquid outlet end of the shunt pipe is communicated with a micro nozzle, a volute spring is additionally arranged between the inner wall of the circular ring and the bottom end of the disc, and a rotary joint is communicated with the top liquid outlet of the winding disc. The auxiliary mechanism can stabilize the temperature in the temperature control active filter under extreme conditions, so that the influence of the harmonic treatment effect of the temperature control active filter caused by the fact that heat is not completely discharged in time is avoided, and the use efficiency of the temperature control active filter is improved.

The invention discloses a novel elevator light curtain which comprises an all-plastic shell and a circuit board arranged in the all-plastic shell. The circuit board adopts a cascade multi-path switching module to gate a plurality of photoelectric units, and a grounding filter network is arranged at the output end of each photoelectric unit for source filtering; an active filtering buffer unit with a PNP triode as a core is introduced into a signal path, and a signal processing module comprising a four-stage operational amplifier and a gradient RC filtering network is adopted for step-by-step amplification and conditioning. Through systematic hardware circuit design, on the premise of not depending on metal shielding, internal and external electromagnetic interference is actively and multiply inhibited from the source to the terminal, meanwhile, the structure is simplified, the cost is reduced, the short circuit and failure risks possibly caused by shell grounding are thoroughly avoided, and higher reliability, environmental adaptability and economical efficiency are achieved.

Dynamic extraocular filtering is a correction method to improve color contrast recognition in color vision deficient observers (non-normal color vision). This method is based on actively controlling wavelength spectrum transmission to retinal photoreceptors, introducing a temporal contrast that is interpreted as color contrast by the observer. The method functions by utilizing an active filter that produces several filter conditions which change at a high frequency. This method changes filter conditions dynamically as opposed to current systems which rely on static band-stop filters.

The utility model discloses power electronics equipment's test and debugging technical field relates to a kind of debugging device for active filter;Including cabinet;The cabinet inside is provided with voltage regulator, control module and power module;The control module is located above voltage regulator;The cabinet side is provided with aviation plug;The power module and voltage regulator are electrically connected;The voltage regulator and aviation plug are electrically connected;The aviation plug is electrically connected with active filter and control module respectively;The active filter and mutual inductor are electrically connected;The mutual inductor and control module are electrically connected;The voltage regulator and intelligent electric meter are electrically connected;The intelligent electric meter and control module and electrically connected.The utility model can realize the quick power-on test of active filter, parameter adjustment and performance verification.

The invention discloses a design method of a three-order active filtering automatic test system, and the method comprises the steps: controlling a PXI platform through LabVIEW programming to achieve the generation of a sweep frequency signal and the collection of filtering response, and completing the signal processing, characteristic analysis and result visualization. The system integrates six core technologies, namely a modularized hardware architecture, automatic process control, frequency domain parameter precision measurement, multi-order characteristic synchronous detection, software and hardware collaborative linkage and simulation data comparison. On the basis of retaining traditional functions such as setting waveform type, amplitude, sweep frequency range, sampling rate, trigger mode, recording cut-off frequency, gain and other parameters, exponential sweep frequency accurate excitation and adaptive signal acquisition are innovatively realized, link interference is reduced through matrix switch multi-channel scheduling, a LabVIEW parallel thread and a feedback node mechanism are combined, and the adaptive signal acquisition is realized. And closed-loop analysis of amplitude-frequency / phase-frequency characteristics and real-time drawing of a Bode diagram are completed.

The application discloses a novel elevator light curtain, comprising a full-plastic shell and a circuit board arranged in the shell. The circuit board adopts a cascade multi-path switching module to select multiple photoelectric units, and a grounding filter network is arranged at the output end of each photoelectric unit to perform source filtering; an active filter buffer unit with a PNP triode as a core is introduced into a signal path, and a signal processing module containing a four-stage operational amplifier and a gradient RC filter network is adopted to perform step-by-step amplification and conditioning. The application actively and repeatedly suppresses internal and external electromagnetic interference from the source to the terminal under the premise of not relying on metal shielding through systematic hardware circuit design, simultaneously simplifies the structure, reduces the cost, and completely avoids the short circuit and failure risk caused by the shell grounding, and has higher reliability, environmental adaptability and economy.

The invention discloses an FF-FB cooperative four-unit active filter based on dual-core multiplexing. The FF-FB cooperative four-unit active filter comprises a noise source part, a load LISN network part and an active filter part, the active filter part comprises a current sampling branch, a first operational amplifier module, a second operational amplifier module, a voltage sampling branch, a plurality of current compensation branches, a first complementary output stage circuit and a second complementary output stage circuit; the two ends of the noise source part are connected with the left side of the active filter part, and the load LISN network part is connected with the right side of the active filter part. Feed-forward current sampling-current compensation is completed by using the multiplexing operational amplifier, and compensation is completed at the source end and the load end of the current transformer through two branches, so that secondary structure multiplexing is realized, and the problem that the operational amplifiers are added in topology is solved.

The application discloses a filter circuit and an implementation method and a filter device thereof, and relates to the technical field of filtering. The filter circuit comprises a signal filtering unit, an active filter unit, a clamping unit, a voltage input end and a voltage output end; wherein the output voltage flows into the signal filtering unit through the voltage input end, and the signal filtering unit is used for filtering the high-frequency small signal interference of the input voltage; the active filter unit is used for filtering the ripple and transient surge of the input voltage, and forming a direct current output voltage; the clamping unit is used for clamping the direct current output voltage at a fixed value and outputting through the voltage output end; wherein the signal filtering unit, the active filter unit and the clamping unit are electrically connected in sequence and arranged between the voltage input end and the voltage output end. According to the filter circuit of the embodiment of the application, the signal filtering unit can filter the high-frequency small signal interference; the active filter unit can filter the ripple and transient surge; and the clamping unit can clamp the direct current output voltage at a fixed value.

The invention provides a power distribution system and a control method thereof. The power distribution system comprises at least one transformer bank which comprises a first transformer and a second transformer, and the first transformer and the second transformer operate alternately; the at least one active filtering device is in one-to-one correspondence with the transformer banks; the circuit breaker group comprises a first circuit breaker, a second circuit breaker, a third circuit breaker and a fourth circuit breaker, and the active filtering device is connected to the low-voltage side of the first transformer through the first circuit breaker and connected to the low-voltage side of the second transformer through the second circuit breaker; the third circuit breaker and the active filter device are connected in parallel to a current transformer CT secondary side of the first transformer, and the fourth circuit breaker and the active filter device are connected in parallel to a CT secondary side of the second transformer; and the control unit is used for controlling the opening and closing operation of the circuit breaker group according to the switching state of the transformer group. According to the scheme, the equipment utilization rate is improved, and cost is saved.

The present application provides a real-time optimization method, system and device for inverter output voltage harmonics, the method comprising: obtaining control parameters of an inverter; controlling the inverter to work according to the control parameters and obtaining N waveforms corresponding to N periods; decomposing the N waveforms to determine a to-be-processed waveform harmonic; when the amplitude of the to-be-processed waveform harmonic exceeds a harmonic threshold, a first optimization mode is used for optimization processing; when the amplitude of the to-be-processed waveform harmonic does not exceed the harmonic threshold, a second optimization mode is used for optimization processing. A method combining two harmonic reduction technologies is used, when the harmonic amplitude is small, the active filter function of the auxiliary inverter is used to reduce the harmonic, and the SHEPWM complex calculation is not used, when the harmonic amplitude is large, the SHEPWM technology is used to eliminate the harmonic, and the flexibility of inverter control is improved.

The invention relates to the technical field of magnetic tape units, in particular to a magnetic tape driver, a magnetic tape unit and a storage system.The magnetic tape driver comprises a read head, an analog equalization circuit and a digital processing chip; the read head is coupled with the analog equalization circuit, the analog equalization circuit is coupled with the digital processing chip, and the analog equalization circuit comprises an active filter; wherein the read head is used for reading an original analog signal from a magnetic tape of a magnetic tape unit and outputting the original analog signal to the analog equalization circuit; the analog equalization circuit is used for performing data equalization on the original analog signal through an active filter to obtain a first analog signal and outputting the first analog signal to the digital processing chip; the frequency response curve of the first analog signal is closer to the frequency response curve of a target signal type than the frequency response curve of the original analog signal, and the target signal type comprises partial response signals; and the digital processing chip is used for converting the analog signal into a digital signal and processing the digital signal. According to the embodiment of the invention, the order of the digital filter in the magnetic tape unit can be reduced.

The utility model provides a snore detection circuit which comprises a microphone, a first sound amplification module, an active filtering module and a processor, the first sound amplification module is used for amplifying sound signals collected by the microphone, the active filtering module is used for filtering the amplified sound signals, and the processor is used for processing the filtered sound signals. The processor is used for filtering various medium-high frequency spurious signals and environmental noise interference signals in the sound signals and outputting target sound signals of low-frequency components meeting snore fluctuating changes, and the processor is used for analyzing whether the target sound signals continuously and rhythmically change or not so as to judge whether the target sound signals are snore signals or not. According to the circuit, snore signal extraction and environmental noise interference filtering can be achieved through a common operational amplifier chip, an expensive artificial intelligence chip and a complex software sampling filtering and recognition algorithm do not need to be adopted, the design difficulty is greatly lowered, and the problems of cost and material preparation are solved. The snore detection circuit can be applied to products such as intelligent snore stopping pillows, intelligent mattresses, sleep monitoring equipment or wearable equipment.

The utility model provides a robot joint controller active filtering system based on an operational amplifier, which relates to the technical field of active filtering and comprises an operational amplifier U1 and a voltage regulator U2. The reverse connection end of the operational amplifier U1 is used as an active positive electrode first port after being connected in series with the capacitor C1, and the output end of the operational amplifier U1 is used as an active positive electrode second port after being connected in series with the resistor R3 and the capacitor C2; the positive electrode of the operational amplifier U1 is electrically connected with the negative electrode of the voltage regulator U2 through the resistor R5, the reference electrode of the voltage regulator U2 is electrically connected with the first port of the active positive electrode through the resistor R4, the positive electrode of the voltage regulator U2 serves as the first port of the active negative electrode, and the second port of the active positive electrode serves as the second port of the active negative electrode after being connected with the resistor R2 and the capacitor C5 in series. Filtering reference voltage of the operational amplifier is adjusted through the voltage regulator, the anti-interference capability is high when line voltage surge suddenly interferes, and effective filtering in a full frequency range is achieved.

The utility model discloses a mounting structure of an active filtering compensation device, and relates to the field of filters, the mounting structure comprises a bracket which is located at the top of a support plate and realizes transverse sliding, the plurality of support plates are uniformly and fixedly arranged at the left and right sides of an inner cavity of a case at equal intervals, and a clamping assembly is arranged at the bottom of the bracket and located between a pair of sliding strips. A pair of first sliding grooves are formed in the supporting plate, a cavity communicated with the pair of first sliding grooves is formed in the position, corresponding to the clamping assembly, of the bottom of the supporting plate, the clamping assembly is located in the cavity, a filter is arranged in the bracket, buckling pieces A are arranged on the left side and the right side of the filter, and buckling pieces B connected with the buckling pieces A in a clamped mode are arranged at the positions, corresponding to the buckling pieces A, of the left side and the right side of an inner cavity of the bracket. According to the device, the filter can be clamped and fixed to the bracket, when the bracket is impacted, the filter is prevented from shaking in the bracket, and the stability is improved.

The utility model discloses a pool water level on-line intelligent monitoring device, which is characterized in that a dual power supply is respectively connected with a Lora Internet of Things wireless communication transmission module, a single chip microcomputer control external storage module, an LCD (Liquid Crystal Display) and an audible and visual alarm through an active filter, and the single chip microcomputer control external storage module is connected with a pressure type liquid level sensor through an RS485 (Recommended Standard 485) transmission module; the Lora Internet of Things wireless communication transmission module is connected with the single-chip microcomputer control external memory module, the LCD display and the audible and visual alarm. The audible and visual alarm is located at the top of the machine box, and the pressure type liquid level sensor is located outside the machine box. According to the utility model, the fire pool water level condition can be effectively monitored, an alarm signal is sent out according to a set high-low water level alarm threshold value, the signal is fed back to the east well water pump and the west well water pump, the combination of the Lora Internet of Things and the fire pool water level online intelligent monitoring is successfully proposed by applying professional knowledge and technology, the fire pool low water level alarm time is shortened, and the fire pool water level alarm efficiency is improved. The emergency disposal time is optimized, and the stability of a fire extinguishing system is improved.

The invention provides a harmonic compensation method for a distributed active filtering system, and relates to the technical field of power distribution networks, and the method comprises the steps: obtaining load data and distributed power data of a power distribution network, and building a power distribution network Norton equivalent model based on a Norton equivalent circuit; pCC harmonic voltage is detected, harmonic responsibility coefficients of all feeder lines are calculated in combination with a Norton equivalent model of the power distribution network, and a harmonic responsibility quantification result is obtained; obtaining harmonic compensation capacity based on the harmonic responsibility quantification result, and dynamically adjusting virtual impedance through droop control to generate basic compensation current; based on the basic compensation current, the compensation capacity of each frequency is adjusted through a frequency division distribution algorithm; a compensation task is autonomously distributed in proportion through multiple inverters according to the adjusted compensation capacity of each frequency; according to the invention, the harmonic source is accurately positioned to optimize the compensation resource allocation, and the stability of the system is significantly improved through the autonomous cooperation of multiple devices.