9results about "Reactive/real component measurements" patented technology

The invention relates to the technical field of power system court management, and particularly discloses a court identification and user binding method based on a special transformer acquisition terminal, which comprises the following steps: separating harmonic interference generated by start and stop of an electric welding machine through a kurtosis index and time-frequency energy entropy fusion detection method, and extracting a fundamental voltage and a pure power signal; constructing a dynamic time bending model containing phase consistency and gradient feature constraint based on the fundamental wave voltage, and calculating voltage track similarity to judge electrical coupling; for the users with electrical coupling, dynamic weight power cross-correlation analysis is fused to generate a comprehensive decision value, and a space-time diagram neural network is utilized to update a transformer area topology structure online in combination with a historical topology change event, so that the dynamic determination of the transformer area to which the users belong is realized; through multi-dimensional feature fusion and anti-interference algorithm design, the problems of phase deviation and waveform distortion caused by electric welding machine harmonic waves are reduced, and the transformer area identification accuracy and real-time performance are improved.

The invention provides a mechanical characteristic monitoring method and system for a switch cabinet, and belongs to the field of power equipment detection, and the method comprises the steps: respectively obtaining the contact stroke of each phase of contact, the isolation knife current of each phase, the grounding knife current of each phase, and the motor current of each phase of a three-phase discrete switch of the switch cabinet in the switching-on and switching-off process; obtaining opening and closing time data of the circuit breaker in the opening and closing process; obtaining stroke characteristics of each phase of contact according to the contact stroke of each phase of contact; obtaining current characteristics of each phase according to the isolating knife current of each phase, the grounding knife current of each phase and the motor current of each phase; obtaining opening and closing characteristics according to the opening and closing time data; and monitoring the mechanical characteristics of the switch cabinet according to the contact stroke characteristics of each phase, the current characteristics of each phase and the opening and closing characteristics. The comprehensiveness and the accuracy of monitoring the mechanical characteristics of the switch cabinet and the effectiveness of fault identification can be improved.

A voltage management device according to the present disclosure includes a communication unit that obtains, for each of sections in a power system, a measurement value of a voltage measured by a smart meter connected to that section, where the sections are generated by segmentation between monitoring points, and a voltage estimation unit that estimates, for each of the sections, a voltage drop quantity and a voltage rise quantity in that section using the measurement value.

The invention provides a frequency power output characteristic test method and device, electronic equipment and a storage medium, and the test equipment is connected with tested equipment through an isolation transformer, and obtains a real-time active component and a real-time reactive component of a current signal outputted by the tested equipment in a two-phase rotating coordinate system; the test equipment changes the output power and frequency of the tested equipment based on the real-time active component, the real-time reactive component and a preset control strategy; and obtaining a frequency-power output characteristic curve of the tested equipment through a fitting algorithm.

The invention provides a method and device for testing output characteristics of a converter, electronic equipment and a storage medium. The voltage-power output characteristics of the converter are tested through the following steps: acquiring a three-phase voltage value at a common connection point and a three-phase current value injected by test equipment; tracking a PCC voltage phase in real time, and establishing a synchronous two-phase rotating coordinate system; converting the sampled three-phase current value from a three-phase static coordinate system to a two-phase rotating coordinate system to obtain a corresponding collected active component and a collected reactive component; the test equipment controls the output current based on the difference value between the given active component and the collected active component and the difference value between the given reactive component and the collected reactive component, so that the converter generates corresponding voltage response; and obtaining a voltage-power output characteristic curve of the converter based on the change of the three-phase voltage value at the common connection point under different disturbance conditions. The problem of a black box current device in an existing train auxiliary power supply system is solved.

This application provides a traveling wave ranging device, distribution terminal, fault monitoring system, and method for distribution networks, relating to the field of distribution network fault monitoring technology. The device includes: a current transformer for acquiring voltage / current traveling wave signals at corresponding detection points; a data processing unit, including: a phase-mode transformation module for performing phase-mode transformation on the voltage / current traveling wave signals to extract the line-mode components of each voltage / current traveling wave signal; a wavelet analysis module for decomposing the extracted line-mode components based on wavelet transform to obtain corresponding wavelet transform coefficients, performing modulus maxima search on all obtained wavelet transform coefficients, and generating a first detection signal representing the detection of the target modulus maxima if a target modulus maxima representing a line fault is determined; and a ranging calculation unit for determining the first fault location information based on the first detection signal. This application enables high-speed sampling and processing of traveling wave data, effectively improving the accuracy of distribution network fault location.

There is provided a system and method for determining active and reactive currents during asymmetrical low-voltage ride through (LVRT) conditions at an inverter. The method including: receiving an indication of an LVRT condition; and where the largest phase current magnitude does not exceed a phase current limit, determining a maximum active current for associated positive-sequence and negative-sequence reactive currents by determining a largest active current magnitude and outputting the largest active current and associated positive-sequence and negative-sequence reactive currents to the inverter, otherwise: scaling down each of the positive-sequence and negative-sequence reactive currents, or superimposed positive-sequence and negative-sequence reactive currents, uniformly or non-uniformly to determine revised positive-sequence and negative-sequence reactive currents; where the magnitudes of all of the phase currents are below the phase current limit, determining a non-zero positive-sequence revised active current; and outputting the revised active current and the revised positive-sequence and negative-sequence reactive currents to the inverter.

The application relates to the technical field of power system transformer area management, and specifically discloses a transformer area identification and user binding method based on a special transformer acquisition terminal, which comprises the following steps: separating the harmonic interference generated by the start and stop of electric welders through a kurtosis index and time-frequency energy entropy fusion detection method, and extracting a fundamental wave voltage and a pure power signal; constructing a dynamic time warping model containing phase consistency and gradient feature constraints based on the fundamental wave voltage, calculating voltage trajectory similarity to determine electrical coupling; for users with electrical coupling, fusing dynamic weight power cross-correlation analysis to generate a comprehensive judgment value, combining historical topology change events, and using a space-time graph neural network to update the transformer area topology structure online, so that the dynamic determination of the transformer area to which the user belongs is realized; through multi-dimensional feature fusion and anti-interference algorithm design, the phase shift and waveform distortion problems caused by the electric welder harmonics are reduced, and the transformer area identification accuracy and real-time performance are improved.

The application provides a kind of network construction converter fault current calculation method, device, equipment and storage medium, it is related to network construction converter fault characteristic analysis technical field, method includes: the equivalent circuit model suitable for network construction converter grid-connected system fault current analytical calculation is constructed;Based on the dynamic equation of reactive power-voltage control link of network construction converter, the internal potential analytical expression of network construction converter is solved;The internal potential analytical expression is substituted into the dynamic equation of positive sequence equivalent circuit, and the analytical expression of fault current positive sequence component is solved;Based on the dynamic equation of negative sequence equivalent circuit, the analytical expression of fault current negative sequence component is solved;The analytical expression of fault current positive sequence component and the analytical expression of fault current negative sequence component are superimposed, and the analytical expression of total fault current of network construction converter is obtained.The calculation result of the application is high in accuracy and wide in applicability.