15 results about "Active power filter" patented technology

The application discloses a kind of electric energy metering box systems based on harmonic identification compensation, including signal pre-processing module, offline training module, online inference module and harmonic reconstruction and compensation module.Signal pre-processing module is framed according to time window to the current signal collected, generates frequency spectrum label count vector.Offline training module executes variational expectation maximization training of implicit Dirichlet distribution model to historical frequency spectrum label corpus, learns the frequency spectrum signature distribution and feature template of multiple harmonic source mode.Online inference module solidifies the parameter obtained by training, executes lightweight variational inference iteration, estimates the harmonic source mixing proportion vector of current frame.Harmonic reconstruction and compensation module carries out weighted vector synthesis to mixing proportion vector and feature template, generates compensation current reference signal output to active power filter.The application can realize sub-millisecond level real-time harmonic source mode identification and compensation in resource-limited embedded environment.

The application discloses a harmonic distributed treatment method based on a self-learning algorithm, and belongs to the field of harmonic treatment of distribution networks. The method adopts a voltage detection active power filter (VDAPF) to treat harmonics, and the key to distributed treatment of a "double-high" distribution network is proposed. The application proposes a method for quantifying the global treatment effect and the degree of participation of VDAPF in collaborative treatment, respectively, to obtain a preliminary performance factor. The preliminary performance factor is converted into a final performance factor based on a self-learning algorithm, and the local control G-U lifting adjustment characteristics of the VDAPF are combined to realize self-organizing distributed optimization of treatment equipment in a distributed treatment system. The harmonic distributed treatment method based on the self-learning algorithm can solve the problem that scattered treatment is not applicable due to the intensification and decentralization of harmonic sources, and can change passive harmonic treatment into active harmonic treatment.

This utility model relates to the field of active power filter technology and provides an active power filter device, comprising: a current transformer connected between the mains power supply and the load for acquiring three-phase current signals; an active power filter whose input terminal is connected between the mains power supply and the current transformer, and whose current transformer interface is connected to the current transformer; the active power filter includes a control board and a display module; the control board is connected to the input terminal and is used to acquire the three-phase voltage signal of the power grid through the input terminal, acquire the three-phase current signal through the current transformer interface, and generate a connection anomaly detection signal for the current transformer based on the three-phase voltage signal and the three-phase current signal, and send a flag bit signal corresponding to the connection anomaly detection signal to the display module. This solves the problem of quickly and accurately providing a connection anomaly detection signal for the external current transformer of the active power filter.

This application relates to a multi-pulse rectifier power supply device and its control method, apparatus, and power supply system. The method includes: determining a first reactive current reference value that needs to be injected into the point of common coupling (PCC) of an active power filter based on the actual output power value and a reference output power value of the multi-pulse rectifier; determining a control signal for the active power filter based on the first reactive current reference value; and controlling the active power filter according to the control signal to inject the target current into the PCC. This method enables regulation of the output power of the multi-pulse rectifier, thereby improving the reliability of the power supply device.

This utility model belongs to the field of hybrid active power filters composed of APF and LC filters, specifically a hybrid active power filter device composed of APF and LC filters, including: an LC filter; the LC filter includes: a first integrated circuit U A Second integrated circuit U B and the third integrated circuit U C The first integrated circuit U A Second integrated circuit U B and the third integrated circuit U C Each circuit is equipped with a capacitor C, a first reactor L1, and a second reactor L2. A harmonic current generator (APF) is connected in parallel across the two ends of L2. The fundamental frequency capacity and harmonic capacity proposed in this patent are equal, while the APF capacity is only 1.5% of the harmonic capacity. This hybrid APF provides a reasonable fundamental frequency capacity while filtering harmonics according to national standards. It is a method to reduce costs when the harmonic capacity exceeds the transformer capacity by 8% due to repeated harmonics. It also achieves the advantage of controllable harmonics by the APF. In practical applications, it can achieve excellent filtering results.

The application provides a power quality comprehensive treatment system based on APF and SVG collaborative control, belongs to the intelligent power grid industry and the power quality comprehensive treatment technical field, and comprises the following steps: acquiring power grid current signals and voltage signals, detecting harmonic components and voltage deviations through a harmonic detection module; adopting a collaborative decision controller to determine a compensation strategy according to the harmonic components and the voltage deviations, and distributing compensation tasks of active power filter channels and static var generator channels; generating harmonic compensation currents through the active power filter channels to suppress high-frequency harmonics; generating reactive compensation currents through the static var generator channels to stabilize voltage fluctuations; and filtering the compensation currents through a filtering module and outputting to the power grid. The power quality comprehensive treatment system can effectively suppress power grid harmonics, stabilize voltage fluctuations, improve power quality, and is suitable for complex power grid environments.

This invention relates to the field of active power filter cabinet technology, and proposes a heat dissipation system for an active power filter cabinet, including a cabinet body. A top air outlet is fixed in the middle of the top surface of the cabinet body, and an air guide frame is fixed in the middle of the top surface of the inner side of the cabinet body. The air guide frame is connected to the inner side of the top air outlet, and a rotating hole is provided in the middle of the top surface of the top air outlet. After the drive motor of this invention drives the cooling fan to rotate, the external cold airflow enters the cabinet body through the bottom air inlet frame for heat dissipation, and then enters the top air outlet through the air guide frame, and is discharged through multiple air outlet slots, carrying away the heat inside the cabinet body. A first filter screen is connected to the air guide frame through a first mounting frame, and a second filter screen is connected to the bottom air inlet frame through a second mounting frame, which can prevent dust from entering the cabinet body and protect the internal equipment from dust. The first and second mounting frames are easy to disassemble and assemble, facilitating the cleaning or replacement of the first and second filters and maintaining efficient heat dissipation capacity.

This application relates to a method, apparatus, and computer equipment for harmonic mitigation in distribution networks. The method includes: first, for each node in the distribution network, obtaining a risk factor characterizing the degree of harmonic exceedance risk at each node, calculating a risk weighting value; based on this risk weighting value, the worst-case node risk penalty term, and the fixed investment cost of voltage-sensing active power filters at rated capacity and the operation and maintenance cost corresponding to the actual compensation capacity, constructing a comprehensive objective function while setting constraints; using the virtual harmonic conductance of each voltage-sensing active power filter at each node of the distribution network as optimization variables, iteratively solving the constructed comprehensive objective function using an improved sine and cosine algorithm to obtain the optimal values ​​of each virtual harmonic conductance of the voltage-sensing active power filter; and finally, configuring the harmonic conductance parameters of the voltage-sensing active power filters in the distribution network based on these optimal values. This method can accurately and efficiently achieve harmonic suppression and safe and stable operation of the distribution network.

The application discloses a sensitive load-oriented micro-grid active power filter cluster cooperative management system and belongs to the field of micro-grid power quality management. The system comprises: a sensitive load portrait module for extracting sensitive load tolerance indexes and constructing a demand portrait; a cluster hierarchical cooperation module for dividing load priorities and generating master-slave cooperation strategies according to the portrait; a dynamic topology reconfiguration module for reconfiguring a control model through a consistency algorithm based on topology changes and cooperation strategies; a virtual impedance adjustment module for optimizing the virtual impedance values of each APF according to the reconfigured model and performing harmonic spectrum shifting; and a harmonic energy dredging module for directing the remaining harmonic energy to non-sensitive loads or energy storage devices when resources are saturated. The application can adapt to differentiated needs of sensitive loads and dynamic topology changes of micro-grids, realize the cooperative management of micro-grid harmonic energy and preferentially guarantee the power quality of sensitive loads.

The application relates to a power distribution network harmonic collaborative management method, device, equipment and storage medium. The method comprises the following steps: firstly, determining a harmonic compensation factor and an operation constraint condition; then, taking the installation position of a parallel active power filter and the harmonic compensation factor of each order as a decision variable, constructing a segmented optimization objective function, taking the minimization of a harmonic overrun amount and the number of overrun nodes as an optimization objective in a first stage, and taking the minimization of a capacity occupation cost, an excessive compensation degree, a close-to-edge operation risk and a repeated site selection probability as an optimization objective in a second stage; finally, taking the decision variable as a solution object, iteratively solving the segmented optimization objective function by using an improved alpha evolution algorithm, and outputting the optimal installation position of the parallel active power filter and the optimal compensation factor of each order of harmonic. By using the method, the power distribution network harmonic management effect can be ensured to reach the standard, and problems such as device capacity waste, excessive compensation and close-to-edge operation can be avoided, so that collaborative optimization management of the power distribution network harmonic is realized.

The present application relates to a kind of LCL type active power filter composite active damping optimization control method, including inverter side current active damping optimization control and grid voltage active damping optimization control.The beneficial effects of the present application are: the present application obtains the wide active damping boundary close to Nyquist frequency using the inverter side current active damping optimization control based on cascaded resonant controller, and has accurate adjustment ability to fundamental current component, to ensure the stable operation of system when grid impedance fluctuates in a large range.In addition, the present application also uses the grid voltage active damping optimization control based on weighted proportional order reduction generalized integrator, solves the potential instability risk caused by the phase margin reduction of active power filter harmonic control unit due to large grid impedance.In summary, the present application effectively improves the weak grid adaptability of LCL type active power filter.

1. Name of the product in this design: Active Filter (K1-150K-V1). 2. Purpose of this design: For use in electronic devices to compensate for harmonics of varying magnitude and frequency, as well as for varying reactive power. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The present application belongs to the technical field of power quality management and control of distribution network, and provides a method and system for voltage harmonic distortion management of distribution network based on scene operation state, which judges the management scene according to the state of node equipment of the distribution network; adopts a harmonic compensation method of multiple active power filters based on the least square method to analyze the influence of compensation current on node harmonic voltage distortion, selects the corresponding voltage management target value according to the judgment result of the management scene, and obtains the harmonic compensation current result under the corresponding management scene; based on the harmonic compensation current result, the voltage management target value is solved, and an adaptive solving adjustment mechanism based on harmonic dynamic change is introduced; according to the preset compensation current fluctuation judgment condition, the difference between the current and previous compensation current change values is compared, the size of the time interval of the solving compensation current change value is dynamically adjusted based on the difference, and the present application realizes the adaptation of distortion management to harmonic variation speed.

This invention provides a harmonic detection method and device based on an active power filter. The method includes: using a multiple sliding average filter to remove high-frequency components of active and reactive currents to obtain a low-frequency signal; predicting and updating the low-frequency signal using a Kalman filter to extract the DC component; designing a sliding mode predictive controller based on the predicted value of the DC-side voltage error of the active power filter; and dynamically optimizing the sliding mode parameters of the sliding mode predictive controller. ， The optimized sliding mode parameters are used to generate the regulating current. This regulating current is superimposed on the DC component, and the fundamental current is separated and the harmonic current is obtained through coordinate transformation. This invention resolves the contradiction between dynamic response and steady-state accuracy in low-pass filters by connecting a sliding mean filter and a Kalman filter in series. By using sliding mode predictive control of the DC-side voltage, it overcomes the problems of poor dynamic performance and robustness under nonlinear and disturbance conditions, thereby comprehensively improving the compensation performance and operational stability of active filters.

The application discloses a composite intelligent control method and system for an active power filter, through the synergistic effect of multiple source control signals, the tracking and compensation accuracy of harmonic and reactive current generated by a nonlinear load is significantly improved, the MPC weight is dynamically corrected in combination with a neural network, the change of power grid impedance, model mismatch and external disturbance can be effectively responded, a repetitive controller is introduced, memory and feedforward compensation are specially carried out on periodic harmonic error, the steady-state performance is improved, the MPC provides optimal switch selection under a limited control set, and millisecond-level response is realized.