22results about How to "Guarantee power quality" patented technology

The invention provides a configuration method and system for an overall electrical scheme of a machine room, and relates to the technical field of electrical planning, and the method comprises the steps: collecting multi-source heterogeneous data, carrying out feature extraction and semantic mapping, constructing a high-dimensional semantic association network, carrying out semantic enhancement, semantic modeling and logic association, extracting an abnormal mode, and obtaining a machine room operation state portrait; determining a machine room energy consumption rule and high-energy-consumption equipment, carrying out composite characteristic analysis to obtain a machine room electrical load curve, carrying out hierarchical progressive prediction in combination with exogenous variables, constructing a target function, solving to obtain optimal configuration parameters, and generating a power distribution system design scheme; a self-learning controller is added in a power distribution unit, the electrical load of a machine room is optimized, a power distribution equipment degradation mechanism model is constructed, service life prediction is performed, a power distribution equipment service life management strategy is output, equipment running abnormally is identified, abnormal reasons are judged by referring to historical abnormal data, and an abnormal report is generated and sent to equipment maintenance personnel.

The invention relates to the technical field of power distribution network dispatching, in particular to an intelligent dispatching method and system for a power distribution network in an industrial park, and the method comprises the following steps: S1, data collection and preprocessing: collecting the real-time operation data of the power distribution network in the industrial park through an intelligent electric meter, a sensor and Internet of Things equipment; s2, performing real-time load prediction: performing load prediction on the industrial park power distribution network by using the load prediction model; s3, dynamic electric energy quality management: identifying electric energy quality abnormity and potential problems; s4, power supply scheme optimization and scheduling strategy generation: generating an optimal power supply scheme and scheduling strategy; s5, real-time monitoring and feedback: the running state of the power distribution network is monitored in real time; and S6, self-learning and optimization: analyzing historical scheduling data and an actual operation effect, and summarizing a scheduling rule and experience. According to the invention, the optimal power supply scheme is generated, and the economical efficiency and reliability of power supply are ensured.

The invention belongs to the technical field of power system automation, and particularly relates to a transformer area power distribution network voltage regulation method, device and equipment in a photovoltaic access scene and a medium. The method comprises the following steps: firstly, determining a topological structure of a transformer area power distribution network, and installing electric energy quality treatment equipment and a flexible voltage regulation device at key nodes; and clustering the distributed photovoltaics by using a clustering algorithm, and determining the adjustment priority of each photovoltaic according to a clustering result. And then, according to the voltage condition of the transformer area side, the corresponding photovoltaic power is controlled in combination with the distributed photovoltaic regulation priority, and the flexible voltage regulation device and / or the electric energy quality treatment equipment are / is regulated, so that the voltage stability is realized. According to the method, the flexibility and the accuracy of voltage regulation are improved, the distributed photovoltaic regulation strategy is optimized, the reliability and the stability of the transformer area power distribution network are enhanced, and technical support is provided for energy transformation and industrial upgrading.

The invention belongs to the technical field of locating and sizing of reactive power devices, and particularly relates to a locating and sizing analysis method and system for a reactive power device of a high-cable-rate urban power grid, and the method comprises the steps: building a mathematical model for calculating the voltage sensitivity and loss sensitivity of the power grid, and converting the voltage sensitivity and loss sensitivity into a standard form through normalization; multi-target weights involved in the mathematical model are evaluated by adopting an entropy weight adaptive decision method, and a multi-target site selection model based on voltage and loss sensitivity is formed as an upper layer model; establishing a capacity planning model of the reactive power compensation device based on the minimum economic cost considering the electric energy quality as a lower layer model; the upper layer model and the lower layer model are combined to form a voltage and loss sensitivity-based double-layer iteration model for locating and sizing of the reactive power compensation device of the high-cable-rate urban power grid; and based on the double-layer iteration model, a reactive power device locating and sizing scheme is obtained. The power quality and economy of the power grid can be effectively improved.

The invention relates to the technical field of electric energy quality control, and discloses a grid-connected inverter dual-mode smooth switching control method suitable for a power grid distortion condition, and the method comprises the steps: operating a grid-connected inverter in a current source control mode, and collecting a network access current and a grid-connected point voltage; determining a system matrix and an output matrix of the grid-connected inverter; discretizing the system matrix and the output matrix, substituting the discretized matrix into a Kalman filter, and obtaining a fundamental wave voltage observation value and a fundamental wave current observation value through the Kalman filter; synthesizing the fundamental voltage observation value and the grid-connected point voltage into a harmonic voltage observation value; setting a system short-circuit ratio boundary value lambda of the grid-connected inverter, and obtaining a system short-circuit ratio SCR; and when it is judged that the current source control mode is switched, the grid-connected inverter is switched to operate in a voltage source control mode. According to the invention, the influence of the power grid fault on the grid-connected inverter can be reduced, and the reliability and stability of the whole power system are improved.

This invention provides a microgrid power coordination method and system based on state-enhanced Kalman filtering, relating to the fields of new energy, power electronics, power conversion, and control technologies. The method includes: constructing a state-space model of an AC microgrid and modeling feeder impedance as an augmented state, thus constructing an augmented state-space model of the AC microgrid; based on the augmented state-space model, using an improved Kalman filtering algorithm, calculating the optimal estimate of the feeder impedance of each distributed power source unit, and using an optimal impedance adjustment algorithm to calculate the virtual impedance of each distributed power source unit; and adjusting the output voltage of each distributed power source unit according to its virtual impedance to achieve reactive power regulation of the AC microgrid. This invention effectively solves the problem of the difficulty in directly obtaining feeder impedance in practical engineering and compensates for feeder impedance mismatch by allocating virtual impedance, thereby achieving reactive power balance in the AC microgrid.

The application belongs to the technical field of power system operation and control, and specifically discloses a distributed energy optimization scheduling method and system based on reinforcement learning, which comprises the following steps: obtaining a distribution network parameter calculation sensitivity matrix, combining real-time measurement data of each node, and fusing to generate a joint scheduling state containing topological coupling information; inputting the state into a reinforcement learning intelligent agent to output an initial collaborative scheduling action; simultaneously constructing a linearized action safety boundary based on the sensitivity matrix and a safety threshold, projecting the initial action into the boundary, and generating a safety scheduling instruction after over-limit checking; and finally converting the safety scheduling instruction into a droop control bias and issuing it for execution. The application combines global collaborative optimization of an intelligent algorithm and deterministic constraints of a physical model, improves overall operation economy on the premise of ensuring that the distribution network meets safe operation constraints.

This invention discloses an unmanned intelligent photovoltaic green electricity distribution device for mines, featuring source-grid-load-storage coordination. The device includes a base, with a nested shock-absorbing assembly at the top. Above the nested shock-absorbing assembly is an energy storage distribution box. An energy storage interface compartment is connected to the left side of the energy storage distribution box, and a distribution control box is located on the right side. A flexible connection assembly is positioned above the energy storage distribution box, and a source-grid adapter box is located above the flexible connection assembly. A dual-path photovoltaic rectifier compartment is located on the left side of the source-grid adapter box, and a mine microgrid connection compartment is located on the right side. Utilizing the dual-path photovoltaic rectifier compartment within the source-grid adapter box, synchronous conversion of two photovoltaic DC power sources is achieved, improving power conversion efficiency and filtering power noise. The mine microgrid connection compartment integrates voltage regulation and lightning protection functions, enabling efficient connection with the mine microgrid.

The invention relates to a control method of a voltage regulating device without a direct-current bus capacitor considering voltage harmonic compensation. The control method comprises the following steps: step 1, building a circuit model of the voltage regulating device without the direct-current bus capacitor; and 2, applying a control algorithm to the voltage regulating device without the DC bus capacitor constructed in the step 1, and carrying out harmonic suppression and voltage regulation. According to the invention, the output voltage can be adjusted in a closed-loop manner, and the background harmonic voltage of the power distribution network is effectively compensated in an open-loop control manner.

The invention relates to the technical field of micro-grid electric energy quality evaluation and treatment, and discloses a micro-grid electric energy quality closed-loop evaluation and treatment method and system based on variance convergence, and the method comprises the steps: collecting the data of each node in a micro-grid, and carrying out the calculation of the data, and obtaining an electric energy quality index; after the electric energy quality index is quantified, calculating an electric energy quality evaluation result of the whole micro-grid; setting a time period, and calculating the convergence degree of the power quality indexes in the time period; when the calculated convergence degree is greater than a set convergence degree threshold value, adjusting the weight of each electric energy quality index, obtaining each electric energy quality again, quantifying the electric energy quality into a score, and recalculating the overall electric energy quality evaluation result of the microgrid; and treating the microgrid power quality problem based on the overall power quality evaluation result of the microgrid. According to the method, the problem of evaluation and treatment of the electric energy quality in the micro-grid is solved, and the micro-grid can obtain accurate electric energy quality evaluation and effective treatment under multiple working conditions through closed-loop evaluation and treatment.

The application provides a primary frequency modulation method of a hybrid energy storage thermal power generating unit based on a flywheel energy storage device, and the method comprises the following steps: calculating a target power increment required for primary frequency modulation of the thermal power generating unit according to a frequency value of a power grid bus; collecting a real-time rotating speed of the flywheel energy storage device, and calculating a maximum power increment that can be output by the flywheel energy storage device in real time according to the real-time rotating speed; calculating a maximum power increment that can be output by a lithium battery energy storage device in real time according to a rated power value and a real-time power value of the lithium battery energy storage device; and dynamically allocating the power increments provided by the flywheel energy storage device, the lithium battery energy storage device and the generating unit in the primary frequency modulation in combination with the actual power regulation capabilities of the flywheel energy storage device and the lithium battery energy storage device and the rotating speed of the generator. The method involves the energy storage resources in the automatic power generation control of the generator unit, improves the frequency modulation effect and increases the frequency modulation response speed.

The invention provides a microgrid power collaboration method and system based on novel state augmented Kalman filtering, and relates to the technical field of new energy and power electronic energy conversion and control. The method comprises the following steps: constructing a state space model of an alternating current micro-grid, modeling feeder impedance into an augmented state, and constructing an augmented state space model of the alternating current micro-grid; based on the augmented state space model, adopting an improved Kalman filtering algorithm to calculate an optimal estimated value of feeder impedance of each distributed power supply unit, and adopting an optimal impedance adjustment algorithm to calculate virtual impedance of each distributed power supply unit; and adjusting the output voltage of each distributed power supply unit according to the virtual impedance of each distributed power supply unit so as to realize reactive power adjustment of the AC micro-grid. According to the method, the problem that the feeder impedance is difficult to directly obtain in actual engineering is effectively solved, mismatch of the feeder impedance is made up by distributing the virtual impedance, and reactive power balance of the alternating-current micro-grid is achieved.

The embodiment of the invention discloses a highway electric energy quality early warning system, and relates to the field of electric energy quality early warning. The system comprises a monitoring data acquisition module of each block of the expressway, wherein each monitoring data acquisition unit comprises a block geographical environment query unit, a block weather data acquisition unit and a block electric energy quality index acquisition unit; the data cleaning module of each block of the expressway is used for cleaning abnormal data, repeated data and missing data of the data acquired by the monitoring data acquisition module of the same block; the electric energy quality prediction module of each block of the expressway comprises an electric energy quality prediction unit and an electric energy quality early warning threshold setting unit; an electric energy quality early warning module of each block of the expressway, wherein the electric energy quality early warning module comprises a monitoring data real-time warning unit and a prediction data early warning unit; and the electric energy quality evaluation module is used for evaluating the electric energy quality. According to the embodiment, the accuracy and difference of early warning are improved.

The present invention relates to a shore-based variable frequency power supply micro-power consumption full-power test method and system under weak power grid conditions, wherein the power supply variable frequency power supply V1 includes a frequency converter VFP1, the shore-based variable frequency power supply V2 includes a frequency converter VFP2, the energy-feeding load power supply V3 includes a frequency converter VFP3, the input end of the frequency converter VFP1 is connected to the shore-based high-voltage power supply, the output end of the frequency converter VFP1 is connected to the input end of the frequency converter VFP2, the output end of the frequency converter VFP2 is connected to the input end of the frequency converter VFP3, and the output end of the frequency converter VFP3 is respectively connected to the output end of the frequency converter VFP1 and the input end of the frequency converter VFP2; the energy-feeding load power supply V3 is used as a simulated load to test the shore-based variable frequency power supply V2, and after the shore-based variable frequency power supply V2 is tested, the shore-based variable frequency power supply V2 is put into use. The advantages of the present invention are: after the test loop forms a loop, no actual work is required, only the current needs to be increased to a predetermined test value, the energy consumption is small, and the power grid does not need to provide a large capacity.

The invention discloses a robot power supply control circuit and a robot, relates to the technical field of robots, and aims at filtering an input power supply through a filtering module to ensure the quality of electric energy. Power is supplied to the main control system of the robot through the first voltage reduction module, power is supplied to the routing module of the robot through the second voltage reduction module, and the main control system and the routing module are separately and independently supplied with power. Besides, the second voltage reduction module supplies power to the routing module through the connection module, and the key control module is used for controlling the connection or disconnection of the connection module to realize the connection and disconnection of the power supply of the second voltage reduction module and the routing module, so that the robot can be controlled according to a key instruction of manual operation or a key instruction sent by a main control system of the robot; the second step-down module is controlled to supply power to the routing module, so that power is not supplied to the routing module when the routing module does not need to work, and unnecessary consumption of a power supply is reduced.

The present invention discloses a plug-and-play power filter device, which belongs to the field of active harmonic filtering of power systems. It includes: an isolation transformer, including a tubular iron core, a primary winding and a secondary winding; the primary winding is a power grid transmission line that passes through the inside of the tubular iron core along the axial direction of the tubular iron core, and the secondary winding is wound on the outer surface of the tubular iron core along the radial direction of the tubular iron core; the tubular iron core is an open structure, and is connected to the power grid transmission line in a plug-and-play manner when used; a control module is used to generate a control signal for controlling an IGBT inverter by detecting system current and compensation current; an IGBT inverter is used to generate a compensation current with the same frequency as the control signal, and inject it into the secondary winding of the isolation transformer. The present invention can filter out high-order harmonics in the power system, facilitate access to the system without changing the original structure of the system, and reduce the volume of the filter device.

The invention discloses a double-variant collaborative self-adaptive control method for virtual inertia and damping parameters of a GFM inverter under a weak power grid, and the method comprises the steps: based on a photovoltaic power generation device, an inverter and an LC filter which are connected in sequence, the photovoltaic power generation device outputs a direct current, the inverter converts the direct current into an alternating current, and the high-frequency harmonic wave is filtered through the LC filter; and the grid-connected point is connected into an alternating-current power grid through an equivalent inductor. The method specifically comprises the following steps: step 1, acquiring an electrical quantity in real time based on a network-forming inverter; step 2, the DSP control module obtains a power grid short-circuit ratio and an active power change rate through voltage, current and active power data; 3, presetting a parameter matrix of virtual inertia and virtual damping corresponding to different short-circuit ratios and active power change rates; and 4, comparing whether the data change exceeds 5%, and judging whether to enter a parameter adaptation process. According to the method, secondary disturbance of parameter switching is eliminated, system frequency oscillation and electric energy quality deterioration are inhibited, and the dynamic response performance is remarkably improved.

The invention belongs to the technical field of aluminum electrolysis cells, and particularly relates to an aluminum electrolysis cell cathode current distribution adjusting device and an adjusting method thereof.The aluminum electrolysis cell cathode current distribution adjusting device comprises a shell assembly, a plurality of anode assemblies are evenly arranged above the shell assembly, and a plurality of cathode assemblies are evenly arranged in the shell assembly; an electrolysis cavity is formed in the bottom shell, and a support is arranged above the bottom shell; the anode assembly comprises a plurality of anode rods, the bottom of each anode rod is provided with an anode carbon block through a clamping jaw, one side of each anode rod is provided with an electrifying plate, and the cathode assembly comprises a plurality of cathode carbon blocks; the device is high in adjusting precision, high in adjusting efficiency, easy to operate, safe, stable, high in adaptability and high in stability, the requirement for accurate and efficient adjustment of cathode current distribution of the aluminum electrolysis cell is met, the electrolysis quality and the electrolysis efficiency of electrolyte are effectively improved, and it is guaranteed that obtained molten aluminum meets the actual machining and production requirements.

A single-phase symmetrical bridge arm double-path hybrid two-level rectifier comprises an alternating current power supply vin, uncontrolled diode rectifier bridge arms D1-D4, diodes D5-D12, an inductor L, an inductor L1, an inductor L2, a switch tube Sa, a switch tube S1, a switch tube S2, a capacitor C and a resistor R. And the diodes D7 and D8 and the switching tubes S1 and S2 form a symmetrical bridge arm structure unit. The hybrid rectifier can be flexibly expanded according to requirements, parallel assemblies are added to improve power output, meanwhile, the quota and loss of devices are reduced, and efficiency and power density are improved. Compared with a traditional two-level converter, the single-phase symmetrical bridge arm double-path mixed two-level rectifier has the advantages that the number of power switch devices is small, no dead zone is controlled, the harmonic content is low, and the power ratio of the two parallel rectifiers can be flexibly adjusted.

The invention discloses a power distribution network reactive power optimization method and device based on a full-pure embedding method and a sparrow algorithm, and the method comprises the steps: building a power distribution network reactive power voltage optimization model considering a distributed power supply by taking the minimum operation cost of a power distribution network and the minimum fluctuation of a comprehensive load curve as targets; deriving all-pure embedded power flow models of different node types of the power distribution network, and constructing a recursive solving equation to solve power series coefficients in a Maclaurin expansion of the all-pure embedded models; a sparrow algorithm is improved by using a chaos-sine-cosine algorithm-Leve flight strategy, reactive voltage optimization solution of the power distribution network is considered in combination with a full-pure embedded power flow algorithm, and an optimal compromise scheme is obtained for a generated Pareto solution set through an information entropy-TOPSIS method. According to the method, the problems that the difficulty of stably and efficiently solving the multi-target optimization operation problem of reactive compensation equipment and flexible resources in a power system containing a distributed power supply is relatively high, the algorithm applicability is poor, and the solving efficiency is low are solved.

The present invention belongs to the technical field of aluminum electrolytic cells, and specifically relates to an aluminum electrolytic cell cathode current distribution regulating device and a regulating method thereof, comprising a shell assembly, a plurality of anode assemblies are evenly arranged above the shell assembly, and a plurality of cathode assemblies are evenly arranged inside the shell assembly: the shell assembly comprises a bottom shell, an electrolysis chamber is opened inside the bottom shell, and a bracket is arranged above the bottom shell; the anode assembly comprises a plurality of anode rods, anode carbon blocks are arranged at the bottom of the anode rods through clamps, a power-on plate is arranged on one side of the plurality of anode rods, and the cathode assembly comprises a plurality of cathode carbon blocks; the device has high regulating accuracy and high regulating efficiency, can meet the requirements of accurate and efficient regulation of the cathode current distribution of the aluminum electrolytic cell, is simple to operate, safe and stable, has strong adaptability and high stability, can effectively improve the electrolyte amount and electrolysis efficiency of the electrolyte, and can ensure that the obtained aluminum liquid meets the actual processing and production requirements.

The invention provides a grid-connected inverter harmonic suppression method based on double-vector model predictive control, and the method comprises the steps: building an inverter prediction model under an alpha-beta static coordinate system, separating an output current into a fundamental component and a harmonic component, and carrying out the prediction control of the fundamental component and the harmonic component; a dual-target optimization function containing a fundamental wave weight coefficient eta and a harmonic wave weight coefficient gamma is constructed, minimization of an error area between PCC harmonic current and a zero axis is taken as a harmonic suppression target, and a dual-vector model is combined to predict and control a dynamic optimal voltage vector and action time thereof, so that coordinated optimization of fundamental wave power transmission and harmonic suppression is realized. The method can effectively reduce the total harmonic distortion rate at the PCC, improves the electric energy quality of a multi-inverter parallel system, and is suitable for an alternating current bus system containing multiple harmonic sources.