4796 results about "AC power" patented technology

The invention provides a network following type and network constructing type energy storage combined planning method and device, and belongs to the field of power system planning. The method comprises the following steps: in a to-be-planned grid following type energy storage and grid construction type energy storage power system, carrying out joint modeling on a grid following type converter, a grid construction type converter and a fed alternating current power grid, so as to obtain a closed loop transfer function of the power system; based on the closed-loop transfer function, constructing a small-interference stability security domain oriented to energy storage joint planning; and converting the small-interference stability security domain into a small-interference stability security constraint, and further establishing a multi-type energy storage joint planning model to obtain a joint planning scheme of following network type energy storage and constructing network type energy storage. According to the method, the influence of the operation condition of the converter on small interference stability can be considered, power system optimization targets such as new energy consumption and the like are considered, and combined optimization configuration of network following type and network construction type energy storage is realized.

Embodiments include an electric vehicle having a charging port configured to receive an alternating current (AC) power, a direct current (DC) battery, and a bidirectional inverter configured to convert AC power to DC power and to convert DC power to AC power, the bidirectional inverter is selectively connected to the DC battery by propulsion switches. The electric vehicle also includes an AC motor connected to the bidirectional inverter and selectively connected to the charging port by a first charging switch, an isolated DC / DC converter motor selectively connected to the DC battery via a second charging switch and a third charging switch, and a processor configured to control the operation of the propulsion switches, the first charging switch, the second charging switch, and the third charging switch based on an operational mode of the electric vehicle.

A household vacuum sealer contains: a base, a lid, and a hot-melt sealing element. The base includes a receiving chamber for accommodating a control circuit and a vacuum pump. The base also includes a vacuuming chamber and an accommodation chamber. The hot-melt sealing element includes a holder, a mica slice, a laminated heating layer, the insulated composite layer, and a protective cap. The insulated composite layer includes multiple insulated tape layers. The laminated heating layer includes a high-temperature resistance tapes made of polyimide, a metal resistance tape, two electrical connection films, and two alternating current (AC) electrodes. The mica slice is parallelly fixed on a top of the holder. The laminated heating layer includes the two electrical connections. Furthermore, the protective cap is covered on the insulated composite layer and includes a hollowly elongated zone.

A broadband oscillation characteristic identification method for a new energy access AC power grid comprises the following steps: compressing an oscillation signal acquired by a PMU by using a Gaussian random matrix, uploading low-dimensional data to a master station, and reconstructing the signal at the master station through an orthogonal matching pursuit (OMP) algorithm; a VMD algorithm with the minimum energy loss as a threshold value is adopted to conduct self-adaptive decomposition on the reconstructed signals, and IMF components containing oscillation information are obtained; the purpose of blind source separation is achieved by maximizing the non-Gaussian property of the output signal through FastICA, independent components are extracted from the mixed signal, and noise is removed; and finally, calculating related information (frequency and amplitude) of oscillation by using FFT (Fast Fourier Transform). According to the method, the technical advantages of CS-OMP, VMD and FastICA are combined, different kinds of oscillation modes and complex working conditions can be dealt with, broadband oscillation in a power system can be better monitored and recognized, safe and stable operation of a power grid is guaranteed, and accurate characteristic parameters (frequency and amplitude) are provided for the oscillation suppression technology.

The embodiment of the invention provides an inverter, a motor controller and a vehicle, and the inverter comprises an integrated drive control board which comprises a drive part and a control part which are disposed on the same circuit board; the onboard current sensor is used for detecting direct current and converting the direct current into three-phase alternating current; the integrated liquid cooling heat dissipation capacitor comprises a high-voltage film capacitor and a liquid cooling heat dissipation device, and at least part of the high-voltage film capacitor is in contact with the liquid cooling heat dissipation device. At least part of the power semiconductor device is in contact with the liquid cooling radiator, the high-voltage film capacitor is connected with a positive electrode and a negative electrode of an upper bridge of the power semiconductor device through a positive electrode switching copper bar and a negative electrode switching copper bar respectively, and a lower bridge of the power semiconductor device is connected with the three-phase copper bar. The integrated liquid cooling heat dissipation capacitor and the liquid cooling heat dissipation device are arranged to dissipate heat of the power semiconductor device and the high-voltage thin film capacitor, and the high-voltage thin film capacitor and the power semiconductor device can be dissipated at the same time through one liquid cooling heat dissipation device.

The invention provides a tumor electric field treatment system, an electrode slice temperature detection method and an electrode slice anomaly detection method, the system comprises an alternating current signal generator, an electrode slice and a controller, the electrode slice comprises a plurality of electrode units and a plurality of temperature detection units, the plurality of temperature detection units are divided into a plurality of row groups and a plurality of column groups, and the plurality of electrode units are connected with the controller. The grounding ends of the temperature detection units in each row group are jointly connected to the same grounding wire, and the signal ends of the temperature detection units in each column group are connected to the same dual-purpose signal wire after being in short circuit with the corresponding electrode units; when the dual-purpose signal line is connected to the temperature sampling point, the grounding wires are sequentially conducted, so that temperature detection signals detected by the temperature detection units are sampled based on the temperature sampling point; when the dual-purpose signal line is connected to the alternating power line, alternating electric signals are transmitted to the electrode units. Therefore, the temperature of the electrode plate can be detected by using fewer conductive traces, and whether the electrode plate is abnormal or not can be judged through temperature detection.

An energy storage system comprises a set of swappable battery modules positioned in battery slots with a battery module being controlled by a control switch. The control switches are linkable to form a charging control chain and / or a discharging control chain respectively to control sequential charging / discharging, parallel charging / discharging, and segmented charging / discharging among the set of battery modules in the energy storage system. Methods to detect defective battery module in a battery slot are also presented. The energy storage system can be configured in an AC power distribution environment, a DC power distribution environment, or in an EV. The energy storage system is scalable, automatically reconfigurable and accepts AC power and regenerated DC power.

The invention relates to the technical field of unit power failure detection, in particular to an AC power supply input power failure detection method and system. The AC power supply input power failure detection method comprises the following steps: comparing a characteristic voltage value with a preset threshold value; triggering a sampling frequency adjustment mechanism according to the preliminary detection signal, increasing the sampling rate according to the voltage fluctuation frequency by adopting an adaptive algorithm, and obtaining high-precision sampling data through real-time calculation; for the optimized power consumption control scheme, acquiring current system state data, coordinating quick response capability and low power consumption optimization through a state machine algorithm, and outputting a multi-stage interaction strategy signal; adjusting a dynamic threshold value of capacitance voltage division design according to the multi-stage interaction strategy signal, and predicting voltage fluctuation by adopting a Kalman filtering algorithm to obtain smoothed detection sensitivity data; and analyzing the misjudgment rate reduction degree through a threshold fine tuning algorithm in combination with the abnormal fluctuation characteristics and the partial pressure state, and outputting a final power failure detection result.

An electric machine is provided. A transformer comprises a magnetic coupling. A wound field synchronous machine comprises a rotor winding, a secondary circuit of the transformer electrically connected to the rotor winding, and a stator winding. The secondary circuit comprises a secondary winding, a rectifier electrically, a switch for switching voltage between the rotor winding and the rectifier in a first direction, and an energy storage arranged to store energy provided by the rectifier and the rotor winding and provide a voltage to the rotor winding in a second direction. A power converter is coupled between the power supply and the wound field synchronous machine. The power converter comprises a stator winding power supply arranged to provide multiple phase AC excitation to the stator winding and a primary circuit of the transformer comprising a primary winding arranged to provide AC power to the primary winding.

The invention discloses an output voltage detection method and system based on an aviation power supply, and relates to the technical field of aviation power supply voltage detection. A differential voltage sensor is connected to the output end of an aviation power supply, a high-frequency suppression capacitor is connected in parallel, the sampling rate of 20-50 times of the working frequency is set according to the type of the power supply, and the signals are collected and converted into analog voltage signals; the analog signal is subjected to two-stage filtering, is amplified to 0-5V through an instrument amplifier, and is converted into a digital voltage sequence through a 16-bit ADC (Analog to Digital Converter); calculating AC power supply effective value, peak value and other parameters, DC power supply average value, ripple coefficient and other parameters; comparing the characteristic parameters with a preset threshold value, determining that the characteristic parameters exceed the threshold value and recording related information; and a detection result is transmitted to a monitoring terminal through an RS485, data is locally stored, and a switching value is output to an alarm device when the data is abnormal. The method adapts to aviation power supply load fluctuation and environment temperature change, detection precision is high, data transmission and storage are safe, abnormity is accurately identified and early warning is carried out in advance, and aviation power supply operation and maintenance reliability and efficiency are improved.

The invention provides a power system economic dispatching method considering dynamic capacity increase of a line and a related device. The method comprises the following steps: establishing a target function taking the minimum unit operation cost of a power system as a target; determining constraint conditions of the target function according to the parameters of the power system, wherein the constraint conditions comprise unit constraint, network variable constraint, linearized alternating current power flow constraint and linearized line thermal stability constraint; the economic dispatching model of the power system is solved, an economic dispatching scheme of the power system is obtained, and the economic dispatching model of the power system comprises a target function and constraint conditions. According to the method, the temperature change of the line is tracked by using the linearized line thermal stability constraint, so that the transmission capacity of the line can be improved on the basis of meeting the thermal stability constraint, an economic dispatching strategy is optimized, and the economic dispatching efficiency is improved by linearizing the alternating current power flow constraint and the line thermal stability constraint. The power system economic dispatching model is constructed into a mixed integer linear programming model, so that the solving speed and efficiency of the model can be improved.

A multiple input converter for outputting power from AC power or a battery to positive and negative direct current (DC) buses is provided. The multiple input converter includes at least one bridge arm unit and a bidirectional DC-DC conversion unit. The bridge arm unit corresponds to one phase of the alternating current (AC) power and includes an upper and lower bridge arms that can independently form a two-level converter. In a battery mode, the upper and lower bridge arms discharge power from the rechargeable battery to the positive and negative DC buses, and the bidirectional DC-DC conversion unit discharges power from the rechargeable battery to the positive and negative DC buses or balances voltages of the positive and negative DC buses. In a mains mode, the bridge arm units are connected to the AC power. The bidirectional DC-DC conversion unit determine whether to charge or discharge according to load conditions.

The invention relates to an integral type photovoltaic energy storage assembly, belongs to the field of solar photovoltaic power generation, and aims to solve the problems that an existing photovoltaic energy storage product is complex in structure and installation, high in cost, low in efficiency and high in safety risk. The integrated photovoltaic energy storage assembly comprises a solar cell panel, an alternating current and direct current multidirectional conversion device and an energy storage battery. The AC-DC multidirectional conversion device and the energy storage battery are installed on the back surface of the solar cell panel, and the extension height does not exceed the back side end surface of the frame of the solar cell panel. The alternating current and direct current multidirectional conversion device comprises three groups of connecting ends, a plurality of voltage converters, a plurality of switch elements and a control chip, the three groups of connecting ends are electrically connected to a solar cell panel, an energy storage battery and an alternating current power grid respectively, and the control chip is configured to selectively switch on at least one switch element in different working modes of the integral photovoltaic energy storage assembly so as to control the three groups of connecting ends. A voltage conversion path is established between the respective two sets of connection terminals by means of at least one voltage converter.

The embodiments comprise an electric vehicle having a charging port configured to receive alternating current (AC) power, a direct current (DC) battery, and a bidirectional inverter configured to convert AC power to DC power and DC power to AC power, wherein the bidirectional inverter is selectably connected to the DC battery by means of drive switches.The electric vehicle also includes an AC motor connected to the bidirectional inverter and selectably connected to the charging port via a first charging switch, a separate DC / DC converter motor selectedly connected to the DC battery via a second and third charging switch, and a processor configured to control the operation of the drive switches, the first charging switch, the second charging switch, and the third charging switch based on an operating mode of the electric vehicle.

A wireless power transfer (WPT) device includes a polyphase coil network comprising a plurality of phases for transfer of high-frequency AC power, each one of the plurality of phases comprising a phase coil, wherein the polyphase coil network is configured to operate in a polyphase configuration to enable transfer of polyphase high-frequency AC power with a mating WPT device operating in a polyphase mode; and operate in a single phase interoperability configuration to enable transfer of single phase high-frequency AC power with a mating WPT device operating in a single phase mode.

The invention discloses an alternating current power grid fault current waveform recording method, and relates to the technical field of power grid fault detection, when power grid waveform distortion or a high-resistance fault symptom is monitored, denoising and wavelet enhancement are performed on multi-source wave recording and simulation data through a data acquisition and preprocessing module, and an initial data set with multi-label high-order features is generated; the multi-task learning module corrects data distribution deviation in combination with domain adaptation and adaptive weighted loss, integrates physical priori such as arc discharge, and recognizes composite faults such as harmonic distortion, short circuit and grounding; through cross validation and noise simulation evaluation, the model verifies robustness through high-order calculus measurement, characteristic attention distribution can be verified in a visual mode, incremental training is automatically triggered when real-time recording reaches a threshold value, a comparison memory mechanism is applied, new fault information is adaptively absorbed, and a multi-label diagnosis closed loop is formed. And the accuracy and continuous optimization capability of multi-scene fault identification of the smart power grid are effectively improved.

The invention relates to an AC-DC integrated grounding fault positioning method and system, and the method comprises the steps: collecting the potential change data of a DC power supply system and the frequency characteristic data of an AC power supply system, and determining the electrical signal characteristics of stray current corrosion; decomposing the electric signal by using wavelet transform, and extracting direct-current and alternating-current components; determining a fault type according to the component amplitude; analyzing the potential gradient and the stray current flow direction in combination with a line topological structure, and determining the position of a fault point; measuring resistance to determine a grounding loop, and analyzing the correlation between corrosion distribution and electrical parameter characteristics; evaluating the influence of corrosion on the grounding path in combination with the material resistivity; according to the method, faults can be accurately recognized, fault points can be accurately positioned, the corrosion degree and the influence of the corrosion degree on the system can be evaluated, and effective support is provided for safe operation and maintenance of a subway power supply system.

The invention provides a coal preparation plant energy storage system and method based on digital twinning, and the system comprises a hybrid energy storage system, a battery management system, a high-voltage DC protection system, a pre-charging / discharging loop, a high-voltage AC power distribution system, a centralized PCS cluster, and a power electronic interface of a power grid. And the battery energy storage array is connected with power consumption equipment in the coal preparation plant. Constructing a digital twinborn model of the power consumption equipment, obtaining a scheduling plan of the coal preparation plant, determining the power consumption equipment required by the technological process under the current scheduling plan, and simulating the workload of all the power consumption equipment under the current scheduling plan through the digital twinborn model; and according to the workload of the power consumption equipment, predicting the electric quantity W required by the peak value of the electricity price under the current production scheduling plan, and configuring the corresponding energy storage capacity. Through full-process efficiency management and control, production efficiency is improved, an electric energy storage system is established, and an optimal power storage and discharge planning plan is given through a digital twin technology and local peak-valley electricity prices, so that the unit power consumption cost is reduced.

The invention relates to the field of power grid simulation, and particularly discloses a control method of an alternating-current power grid broadband oscillation simulation device based on a component physical model, which realizes broadband domain oscillation simulation of an alternating-current power grid based on the component physical model and a notch filter. Specifically, according to the control method of the alternating-current power grid broadband oscillation simulation device based on the element physical model, an adjustable element physical model type and a corresponding impedance parameter serve as input conditions, and a dynamic voltage compensation component excited by power grid impedance is calculated in combination with an adjustable notch filter; and a power grid simulation reference signal is constructed in real time through superposition of an original input reference voltage value and a dynamic voltage compensation component excited by power grid impedance, so that oscillation simulation in a wide frequency domain of the alternating-current power grid is realized.

The invention relates to a lithium ion battery overcharge thermal runaway early warning method, early warning device and processing equipment, and the lithium ion battery overcharge thermal runaway early warning method comprises the steps: obtaining an electrochemical impedance spectrum of a lithium ion battery, and obtaining a single-point frequency in a low-frequency region of the electrochemical impedance spectrum; performing direct current charging on the lithium ion battery, and injecting an alternating current power supply of which the frequency is a single-point frequency into the lithium ion battery; acquiring a voltage component and a current component of the lithium ion battery under the alternating current power supply; acquiring the electrochemical impedance of the lithium ion battery according to the voltage component and the current component; and generating overcharge early warning information according to the condition that the imaginary part amplitude of the electrochemical impedance or the real part amplitude of the electrochemical impedance meets a preset condition. Through the technical scheme disclosed by the invention, the problem of lithium ion overcharge thermal runaway can be found in time, the problem of explosion fire caused by thermal runaway caused by lithium ion battery overcharge is avoided, and the operation safety of the energy storage system is ensured.

The invention discloses a fault processing method for an offshore wind power direct current parallel sending-out system through a DRU-MMC. The fault processing method comprises the steps that direct current energy consumption devices are arranged at direct current outlets of respective land MMC converter stations of a DRU-HVDC system and an MMC-HVDC system; when the alternating current power grid at the receiving end has an alternating current fault, the direct current energy consumption device is controlled to adopt a direct current voltage suppression strategy; when the DRU-HVDC system and the MMC-HVDC system respectively have direct current faults, different locking and circuit breaker disconnection time sequence control strategies are adopted, and in the direct current fault ride-through period, a direct current suppression strategy and a direct current voltage suppression strategy are controlled to be adopted by a direct current energy consumption device of the DRU-HVDC system. Therefore, the fault ride-through capability of the DRU-MMC direct current parallel sending-out system of the offshore wind power can be effectively improved, and stable operation of the system is ensured.

The invention relates to the technical field of power systems, and discloses a new energy grid-connected system broadband oscillation risk assessment method, system, device and medium, and the method comprises the steps: constructing an impedance external characteristic model of a new energy station, and constructing impedance external characteristic models of an AC power grid of different broadband oscillation risk assessment frequency bands; therefore, different broadband oscillation risk assessment frequency bands are flexibly processed, and the impedance external characteristic model of the new energy station and the impedance external characteristic model of the AC power grid are used to determine the impedance external characteristic curve of the new energy station and the impedance external characteristic curve of the AC power grid. And performing broadband oscillation risk assessment on the new energy grid-connected system by using a comparison result of the impedance external characteristic curve of the new energy station and the impedance external characteristic curve of the alternating current power grid, and fully considering the influence of a topological structure and an operation condition on the broadband oscillation risk. And the broadband oscillation risk assessment accuracy and adaptability of the new energy grid-connected system are improved.

An apparatus may control the power delivered from an AC power source to an electrical load, and may comprise a controllably conductive device. The apparatus may also comprise a controller that may be operatively coupled to a control input of the controllably conductive device. The apparatus may also include a first wireless communication circuit operable to communicate via a first protocol and to join a first wireless communication network operable to communicate via the first protocol. The first wireless communication circuit may be in communication with the controller. The controller may be operative to determine a first condition for communicating via the first protocol. The controller may also be operable to control the first wireless communication circuit to join the first wireless communication network upon the first condition being satisfied.

The invention discloses a power supply intelligent management control system, and relates to the technical field of power supply management, and the system comprises a power supply processing module which is used for accessing and transmitting AC electric energy and carrying out voltage reduction, rectification filtering, inversion and transformation processing; the current sampling module is used for current sampling control, signal conversion and amplification filtering; the voltage comparison module is used for setting an overvoltage threshold value, comparing the overvoltage threshold value with the voltage and detecting the shunting degree; the power taking processing module is used for converting, amplifying and filtering the shunted sampling signals, and rectifying and storing the shunted sampling signals; the intelligent control module is used for signal receiving and module control; the electric energy adjusting module is used for adjusting voltage; and the output processing module is used for outputting filtering and electric energy superposition processing and supplying power to the output module. The intelligent management control system for the power supply can provide voltage stabilization and perform shunt power taking work and electric energy processing when a sampled signal is greater than a set threshold value, so that the safety of the system can be improved, and energy-saving power supply control can also be performed.

The invention discloses a novel photovoltaic optimizer based on PLC communication, which comprises a hardware module, a control module, a communication module and a service module, and is characterized in that the hardware module is used for constructing a system material basis and realizing electric energy calling, signal coupling and equipment protection, and the control module is used for realizing intelligent power regulation and communication control; the power generation efficiency is improved and the communication stability is guaranteed through a multi-modal algorithm, and the communication module is used for constructing a power line carrier communication system. A special PLC framework for a direct-current low-voltage environment is adopted, a communication frequency band and an impedance matching scheme can be designed according to photovoltaic direct-current side characteristics, technical field differentiation is formed from alternating-current power grid PLC patents, through dual-mode MPPT dynamic switching, the limitation of a single algorithm in a dynamic environment can be broken through through combination of local gradient prediction and a distributed collaborative algorithm, and the real-time performance of a photovoltaic power grid is improved. In cooperation with a passive impedance compensation technology, adaptive adjustment can be performed through the magnetic ring filter and the capacitor array, an additional power supply module is not needed, and the hardware complexity is reduced.

An emergency LED lighting system maintains power to an LED lighting source based on measured voltages and currents provided to the LED lighting source; rolls back or decreases power provided to an LED lighting source over time in order to increase the amount of time the battery can power the LED lighting source; executes a soft start procedure, such that the power provided to the LED lighting source is gradually ramped up during activation of the LED lighting sources; identifies a type of battery coupled to the emergency LED lighting system; cycles the emergency LED lighting system between charging mode and standby mode to reduce power consumption over a window of time; detects AC power or an absence of AC power; and / or uses a status LED to communicate information about the emergency LED lighting system with a remote device.

An object of the present invention is to enable two or more power supply units constituting a power supply system to be synchronized to stably operate the power supply system. A power supply system 100 includes two or more power supply units 10 to 13, the power supply units 10 to 13 cooperating to supply DC power to a shared load 22, the power supply units 10 to 13 including a power supply main circuit 30 that converts AC power inputted from the outside into DC power; a control unit 36 that controls the power supply main circuit 30; a pair of synchronous terminals Z1, Z2 respectively connected to a pair of synchronous signal lines ZCL; a transmission unit 35 that outputs a trigger signal TG by establishing conduction between the pair of synchronous signal lines ZCL; and a reception unit 35 that detects a conductive state between the pair of synchronous signal lines ZCL and that receives the trigger signal TG, wherein the power supply main circuit 30 stops outputting based on timing of receiving the trigger signal TG.

The invention, which relates to the technical field of direct-current power transmission, discloses a co-offshore medium-high-frequency alternating-current offshore wind power full-direct-current collection system comprising: an offshore wind turbine module, which is used for obtaining offshore medium-voltage direct-current electric energy; the multi-port direct-current voltage transformation module is used for converting the offshore medium-voltage direct-current electric energy into offshore high-voltage direct-current electric energy; the direct-current submarine cable module is used for gathering the offshore high-voltage direct-current electric energy, acquiring the gathered offshore high-voltage direct-current electric energy and transmitting the gathered offshore high-voltage direct-current electric energy to the shore converter station module; the shore converter station module is used for acquiring shore high-voltage alternating-current electric energy according to the collected offshore high-voltage direct-current electric energy; the onshore alternating current module is used for receiving the onshore high-voltage alternating current electric energy and achieving full-direct-current collection of offshore wind power. By improving the medium voltage-high voltage direct current transformer topological structure and the control method, efficient and economical electric energy transmission is realized, the construction economy and the engineering application value of an open-sea wind power collection system are improved, and the average price and low price requirements of marketization development are met.

The motor control device that controls driving of a motor connected to a power converter performing power conversion from DC power to AC power, the motor driven using the AC power, includes a carrier wave generation unit that generates a carrier wave, a carrier wave frequency adjustment unit that adjusts the frequency of the carrier wave, and a gate signal generation unit that generates a gate signal for controlling operation of the power converter by performing pulse width modulation of a voltage command corresponding to a torque command using the carrier wave, and the carrier wave frequency adjustment unit adjusts the frequency of the carrier wave in accordance with the torque command and the rotation speed of the motor so that a phase of pulsating torque due to command current generated by the pulse width modulation using the carrier wave overlaps a phase of pulsating torque due to interlinkage magnetic flux of the motor within a predetermined phase difference.

The invention provides a current source type hybrid direct-current power transmission system based on an injection type power grid commutation converter, and relates to the field of high-voltage direct-current power transmission, and the system comprises a rectification station which at least comprises a thyristor-based power grid commutation converter and is used for converting alternating current into direct current; the inverter station at least comprises an injection type power grid commutation converter and is used for converting the direct current output by the rectifier station into alternating current; and the control module is used for controlling the operation of the rectifier station and the inverter station based on the trigger time sequence constraint, and has the advantages of completely inhibiting the commutation failure and reducing the loss.