14 results about "Electric power quality" patented technology

The invention discloses an emergency power supply quick access method based on scene recognition, which relates to the technical field of emergency power supplies, and comprises the following steps: in an emergency power supply system, firstly obtaining electrical input parameter information through a preset detection frequency; by introducing a load change evaluation mechanism based on machine learning, the system can identify load fluctuation in real time and dynamically adjust the detection frequency, and the response speed to the rapid change of the load is improved. Compared with a traditional detection method, the load state is intelligently evaluated and accurately divided, it is ensured that the power factor is adjusted in time when the load fluctuates violently, and power loss and waste are reduced. Correction is carried out according to the traditional frequency during stable load fluctuation, the frequency is dynamically adjusted during rapid fluctuation, the electric energy use is optimized, the electric power quality is improved, and harmonic distortion and overload risks are reduced.

The invention discloses a harmonic traceability method based on a harmonic power direction of an electric power system, which belongs to the technical field of electric power quality of the electric power system and comprises the following steps of: constructing matrixes of fundamental waves and harmonic signals, initializing active and reactive power deviation values of nodes, and adopting a decoupling algorithm combined with a Jacobian matrix iteration method to carry out harmonic traceability. And sequentially calculating the fundamental wave voltage and each harmonic current, and finally obtaining the power flow direction and judging the harmonic source attribute. When harmonic power flows from a load to a power grid, the node is identified as a harmonic source; and when the harmonic power flows to the load from the power grid, identifying the node as a harmonic receiving point. An equivalent circuit model is used for separating harmonic influences of a linear load and a non-linear load, and a real-time monitoring technology is combined to realize dynamic tracking and accurate positioning of a harmonic source. The method is low in calculation complexity, excellent in convergence performance and suitable for a modern power distribution network scene where distributed energy and power electronic equipment are widely connected, the harmonic suppression efficiency is remarkably improved, and the safety and stability of power grid operation are ensured.

The invention discloses a multi-zone-area interconnection model prediction control system and method based on side-end interoperation, relates to the technical field of power distribution automation, and comprises the steps of designing an interconnection system, configuring equipment to realize system architecture construction, optimizing a communication architecture, realizing real-time information interaction, and performing collaborative optimization based on model control prediction. According to the method, by adopting a model predictive control (MPC) strategy, energy dynamic distribution and load balancing between transformer areas are achieved, and the power quality problem caused by load fluctuation and distributed energy access can be effectively solved; the optimized communication architecture enables the real-time information interaction to be more efficient, and the cooperative control capability among the transformer areas is improved; through the flexible direct current interconnection technology, the problems of difficulty in capacity increase and point distribution and voltage quality difference of a traditional power distribution network are solved, and the stability and the safety of the power distribution network are improved. And meanwhile, the flexibility of cooperative operation of multiple transformer areas is improved, and the self-recovery capability of the system under the fault condition is enhanced.

The invention relates to the field of electric power quality detection, and discloses an electric power engineering quality evaluation early warning system based on data analysis, which comprises a monitoring unit, a database, an electric power quality calculation unit, a quality membership analysis unit and a trend estimation unit, the monitoring unit comprises a voltage monitoring module, a frequency monitoring module, a three-phase voltage monitoring module and a power grid harmonic monitoring module, the voltage monitoring module is used for acquiring an actual voltage value, the frequency monitoring module is used for acquiring a power grid system frequency actual value, and the three-phase voltage monitoring module is used for acquiring voltage positive-sequence and negative-sequence component root-mean-square values; the power grid harmonic monitoring module is used for acquiring harmonic information of a power grid system, the monitoring unit is used for transmitting the information to the database, and the database stores the information and attaches keywords and timestamps; according to the method, the voltage deviation, the frequency deviation, the three-phase voltage unbalance degree, the voltage fluctuation and the voltage total harmonic distortion rate can be pre-estimated and calculated according to the previous parameters, so that the electric power quality evaluation and early warning function is realized.

The invention provides a power distribution energy high-quality energy supply service method, system, device and medium facing user diversified demands, and belongs to the technical field of power distribution, and the method comprises the steps: collecting user power consumption quantity data and user power consumption quality data at the same timestamp in real time; calculating a power quality index; judging whether the user power consumption increase amount is greater than a user power consumption increase threshold value or not, and if yes, generating an overload signal; judging whether the power quality index is greater than a quality index threshold, if so, generating a poor-quality signal, and performing early warning; calculating a socket load amplification and an overload index in response to the overload signal; whether the overload index is larger than the overload index maximum value or not is judged; if yes, an overload abnormal signal is generated, and early warning is carried out; and if not, updating the power utilization increase threshold value of the user. The system collects data in real time, evaluates the power quality, dynamically adjusts the power utilization threshold, distinguishes real overload from normal capacity increase, improves the flexibility of a power distribution system, reduces the operation and maintenance cost, and guarantees the power utilization safety.

The application provides a power distribution box power quality optimization method and device, and belongs to the technical field of smart grids. The method comprises the following steps: determining three-phase electrical effective value data based on three-phase electrical sampling data at the outlet of a smart grid terminal power distribution box; determining a power factor, a load change rate, a total harmonic distortion rate and a three-phase imbalance degree based on the three-phase electrical effective value data; determining an electric power quality disturbance grade type based on the total harmonic distortion rate, the three-phase imbalance degree and the power factor; determining a power distribution box operation scene type based on the load change rate, wherein the operation scene type is a steady-state scene or a transient mutation scene; determining the governance weight of a plurality of governance components based on the electric power quality disturbance grade type, determining a hierarchical governance instruction based on the governance weight of the plurality of governance components; and generating a scene-adaptive governance instruction based on the hierarchical governance instruction and the operation scene type. The application can realize hierarchical and accurate governance of power distribution box power quality disturbances and adapt to the development needs of smart grids.

The present application relates to the technical field of low-voltage droop power adjustment at the end of rural power grid, and discloses a self-adaptive droop power control system for treating low-voltage at the end of rural power grid. The self-adaptive droop power control system for treating low-voltage at the end of rural power grid collects voltage data and current data at the end of rural power grid, pre-processes the two kinds of data, calculates an adjustment factor according to the two deviation values, calculates the actual power in a collection cycle according to the actual voltage measurement value and the actual current measurement value after the adjustment factor is generated, combines the actual power in the collection cycle and the adjustment factor to calculate a final adjustment power value, and adjusts the droop power of low-voltage at the end of rural power grid according to the final adjustment power value, so as to realize real-time dynamic adjustment of the voltage at the end of rural power grid, avoid static voltage adjustment mode, correspond to load changes in real time, meet dynamic demand, be suitable for use in various regions, and improve power quality stability.

The invention discloses a power distribution cabinet combined green energy and VVVF system. A green energy access module accesses renewable energy sources such as solar energy and wind energy, so that the system can automatically switch power sources according to requirements and supply conditions, and the proportion of green energy in total energy consumption is increased; the independent power supply module enhances the power supply stability and flexibility of the system; the VVVF driving module controls the voltage and the frequency to ensure the stability of the system; the power distribution cabinet control and monitoring module ensures intelligent and automatic management of the system, improves the flexibility and response speed of the system through accurate regulation and control of energy supply and load requirements, provides data support for system optimization through real-time data acquisition and analysis, ensures that equipment is always in an optimal operation state, and improves the system reliability. And the reliability of the system is improved. According to the invention, the energy consumption of the power distribution system is optimized, the power quality is improved, and a contribution is made to environmental sustainability.

The invention provides a harmonic attenuation control system for controlling an inverter, which comprises a phase-locked loop controller, a voltage and loop controller, a repetitive controller, a current loop controller and a harmonic acquisition module, and is characterized in that the harmonic acquisition module detects a harmonic value of load current from a load side; when the power grid and the load are directly connected at the bypass, the load current is equal to the sum of the output of the inverter and the power grid current; the control system generates an inversion current reference value according to a voltage and a first current value and a harmonic value output by a loop controller, and a phase-locked loop controller calculates a real-time frequency value according to the voltage of a power grid. The repetitive controller calculates and obtains an output value of the repetitive controller according to the inverter current reference value, the inverter output current serving as the auxiliary feedback and a real-time frequency value output by the phase-locked loop controller, and the current loop controller outputs a first duty ratio according to the output value of the repetitive controller; the control system defines the inverter output current according to the first duty cycle such that grid harmonic pollution is reduced, thus having higher power quality.

The invention provides an energy-saving device with an intelligent monitoring function and an energy-saving method of the energy-saving device. The energy-saving device with the intelligent monitoring function mainly comprises a waveform correction filter and a plurality of digital electricity meters, and the waveform correction filter is connected to the input end of an electric disc of a three-phase alternating current power line so as to absorb and remove input power pollution and improve the quality of input power. The plurality of digital electricity meters are respectively connected to the input end of the three-phase alternating-current power line pan electric disc and each electric appliance system, and are connected to an energy management system, so that the electric energy use of each electric appliance system is intelligently monitored and controlled, and the power supply efficiency is greatly improved.

The present invention discloses an electric energy meter, which includes a plurality of first terminals for receiving the measured value of the current of each of one or more phases of electric power, and a plurality of second terminals for receiving the measured value of the voltage of each of the one or more phases of electric power. A controller is configured to analyze the measured value of the current and the measured value of the voltage of each of the one or more phases of electric power so as to detect power quality problems in one or more of the one or more phases of electric power. For each of the detected power quality problems, the controller is configured to determine whether the detected power quality problem is caused by a utility generating electric power or a consumer consuming electric power, and transmit a message indicating the detected power quality problem via a communication port operably coupled to the controller.

The invention discloses a micro-grid power resource management method and system, and the method comprises the steps: obtaining the operation data of each node in a micro-grid in real time, and calculating the comprehensive power quality index of each node based on the operation data; predicting operation data of each node in the micro-grid, and calculating an abnormal index of each node based on the operation data obtained and predicted in real time; calculating a resource scheduling index of each node according to the comprehensive power quality index, the abnormal index and the load change rate of each node; and scheduling the power resource of each node based on the resource scheduling index of each node. The quality of the power system is comprehensively evaluated by using the comprehensive power quality index, power abnormity can be quickly identified, the accuracy of voltage load monitoring is improved, abnormal fluctuation of the microgrid is detected by calculating the abnormal index, potential problems are identified in advance, and major faults caused by voltage abnormity or load fluctuation are avoided. And accurate micro-grid management is realized.

Disclosed are an electric power quality control method and device for an oil production platform, and a storage medium. The method includes: obtaining test data of electrical loads of power distribution rooms of an oil production platform, and determining electric power quality index data of each power distribution room based on the data; determining a power distribution room with an electric power quality problem based on the electric power quality index data and a preset index range; configuring a corresponding compensation scheme based on each electric power quality problem of the power distribution room with the electric power quality problem, the compensation scheme including a compensation device and a compensation capacity; and determining, based on the compensation device and capacity, functional and economic index data corresponding to each compensation device, and performing electric power quality control on the oil production platform based on the functional and economic index data.