182results about "Single ac network with different frequencies" patented technology

The invention relates to the technical field of micro-grids, in particular to an alternating current and direct current hybrid micro-grid cooperative control method. According to the technical scheme, the alternating current and direct current hybrid micro-grid cooperative control method comprises the following steps that S1, a multi-stage micro-grid framework is constructed and comprises a main micro-grid, a direct current sub-micro-grid and an alternating current sub-micro-grid, and the main micro-grid and the direct current sub-micro-grid are connected through a bidirectional interconnection converter; s2, deploying a hierarchical Multi-Agent control architecture, wherein the hierarchical Multi-Agent control architecture comprises a main micro-grid agent, a direct current sub-micro-grid agent and an alternating current sub-micro-grid agent; and S3, executing three-level cooperative control, receiving a main network scheduling instruction by the main micro-grid agent, decomposing the main network scheduling instruction into sub-micro-grid control targets, coordinating power distribution among sub-micro-grids based on a global optimization algorithm, and maintaining voltage and frequency stability by the DC sub-micro-grid agent and the AC sub-micro-grid agent through a local control algorithm. According to the method, the power grid consumption efficiency and the operation stability in a high-proportion new energy access scene are remarkably improved.

A wireless power transmitter that transmits power to a wireless power receiver, the wireless power transmitter including a communication unit configured to communicate with the wireless power receiver; and a controller, wherein the communication unit receives a plurality of packets including a foreign object detection (FOD) status packet from the wireless power receiver, wherein the controller determines whether a foreign object is present in a charging area of the wireless power transmitter on the basis of the FOD status packet, wherein the communication unit transmits, to the wireless power receiver, a response signal indicating whether the foreign object is present in the charging area of the wireless power transmitter on the basis of a result of the determination, wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver, and wherein the plurality of packets further include at least one of a signal strength packet, an end power transfer packet, a power control hold-off packet, a configuration packet, an identification packet for transmitting receiver identification information, an extended identification packet, a general request packet, a special request packet, a control error packet, a renegotiation packet, a 24-bit received power packet, an eight-bit received power packet, and a charging status packet.

The invention provides a direct-current capacitance determination method for a flexible interconnection device of a three-port intensive low-voltage power distribution network, the flexible interconnection device comprises three alternating-current ports and a direct-current port, each alternating-current port is connected with a power grid through an alternating-current feeder line, and the direct-current port comprises a plurality of direct-current capacitors; the method comprises the following steps: respectively determining active power and reactive power of three alternating-current feeder lines, and respectively determining current and modulation voltage of three alternating-current ports according to the active power and the reactive power of the three alternating-current feeder lines; according to the current and the modulation voltage of the three alternating current ports, determining a current instantaneous value of a direct current capacitor without a current direct current component in a fundamental wave period; determining the capacitance value of the direct current capacitor according to the capacitor voltage ripple limit value and the current instantaneous value of the direct current capacitor; the scene of multiple alternating current ports is considered, and the adjusting effect of the power flow is improved.

A electrical power system comprises: an electrical machine operable to output AC; a DC electrical network; a power electronics converter connected between the AC output of the electrical machine and the DC electrical network and including a plurality of transistors and associated diodes connected in parallel with the transistors; and a controller configured to control switching of the transistors of the converter so that, during normal operation of the electrical power system, the converter rectifies the AC output of the electrical machine to supply the DC electrical network with DC electrical power. The controller is further configured, responsive to a determination to the effect there is a fault in the DC electrical network, to control a voltage source, to inject a voltage to bias the diodes of the converter, and to control the switching of the transistors to control a level of current supplied to the faulted DC electrical network.

The invention discloses an AC / DC power distribution network structure selection method comprising the following steps: obtaining typical scene data and candidate grid structure information, the typical scene data comprising scene load, distributed energy node information and a typical daily power curve; establishing a flexibility adjustment capability demand index system, and forming a multi-dimensional demand vector; calculating a flexibility evaluation index of each grid structure in a typical scene, and forming a capability vector; carrying out maximum and minimum normalization processing on the demand vector and the capability vector; and calculating the cosine similarity of the normalized capability vector and the demand vector as a matching degree, and sorting and selecting an optimal grid structure based on the matching degree. According to the method, multiple dimensions such as economical efficiency, new energy consumption rate and electric energy quality can be comprehensively considered, a scientific and visual decision basis is provided for complex AC / DC power distribution network architecture type selection, so that the problem that multiple targets are difficult to consider in a traditional method is solved, and the planning accuracy and efficiency are remarkably improved.

A wireless power receiver that receives power from a wireless power transmitter, the wireless power receiver including a communication unit configured to communicate with the wireless power transmitter; and a main controller, wherein the main controller generates a plurality of packets including a foreign object detection (FOD) status packet, wherein the communication unit transmits the FOD status packet to the wireless power transmitter, and the communication unit receives, from the wireless power transmitter, a response signal indicating whether a foreign object is present in a charging area of the wireless power transmitter, wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver, and wherein the plurality of packets further include at least one of a signal strength packet, an end power transfer packet, a power control hold-off packet, a configuration packet, an identification packet for transmitting receiver identification information, an extended identification packet, a general request packet, a special request packet, a control error packet, a renegotiation packet, a 24-bit received power packet, an eight-bit received power packet, and a charging status packet.

The invention relates to the technical field of power electronics, and discloses a wall-mounted power supply and an intelligent monitoring system thereof, and the system comprises a cabinet body which is internally divided into a top AC input region, a middle region and a bottom battery output region; according to the two-way alternating current input circuit, an alternating current input 1 and an alternating current input 2 are respectively connected to a contactor through a circuit breaker to realize switching of a main power supply and a standby power supply through interlocking logic; the rectification and conversion circuit is used for converting AC input into DC48V through a rectification module to charge the lithium iron phosphate battery pack, and outputting the DC 48V to a DC bus through a boost module; an output power distribution circuit, wherein the DC bus is distributed to a plurality of load output circuits through a fuse; and a monitoring unit interface. Seamless switching of two-way alternating current input is achieved through mechanical and electrical interlocking design, zero-delay switching power supply of a main power supply and a standby power supply is ensured, the state of a battery is monitored in real time, a charging and discharging strategy is dynamically optimized, multiple protection mechanisms are integrated, power supply continuity is remarkably improved, the service life of the battery is prolonged, and stable operation requirements under complex working conditions are met.

The present disclosure provides a method for detecting a foreign object placed in a charging area of a wireless power transmitter and a wireless power transmitter. The method includes transmitting, by the wireless power transmitter, a power signal having a predetermined strength; measuring, via a controller, a peak frequency of the power signal; receiving, from a wireless power receiver, a data packet including a mode bit field, the mode bit field indicating whether the data packet includes a reference peak frequency of the wireless power receiver, wherein the reference peak frequency is pre-assigned to the wireless power receiver; in response to the mode bit field indicating that the data packet includes the reference peak frequency, determining, via the controller, an adaptive threshold frequency adjusted based on the reference peak frequency; and determining, via the controller, whether a foreign object is present in the charging area based on a comparison of the measured peak frequency of the power signal and the determined threshold frequency.

A self-contained nanogrid system comprises a power supply input to couple to an external primary power source within a premises, a switch coupled to connect or disconnect the system from the primary power, and a battery as backup to the primary power source. The system further comprises a DC power bus coupled to the battery, an AC power bus coupled to the power supply input via the switch, and a bidirectional inverter coupled between the AC and DC power buses. The system further comprises an integrated load coupled to receive power from the AC power bus or the DC power bus, a power output to provide power from the AC power bus or the DC power bus to an external load, and a processing unit configured to control operations of the self-contained nanogrid system, including the switch.

The embodiment of the invention discloses a control system of a multi-voltage bus hybrid micro-grid. The control system comprises a control layer and a hardware layer, wherein the medium-voltage direct-current bus is used for being connected with a distributed energy module of which the power is higher than a first set power value; the low-voltage direct-current bus is used for connecting an equipment assembly of which the power is lower than a second set power value, and the equipment assembly at least comprises a direct-current load of which the power is lower than a set value and a data center load; the AC bus is compatible with a traditional power grid and an AC load; the main control layer is used for realizing closed-loop regulation of voltage and current; the auxiliary control layer realizes the consistency of multi-bus voltage and frequency based on state estimation, bus impedance identification and virtual inertia control; and the comprehensive power management layer realizes cross-bus energy balance and power sharing based on a model predictive control and optimal scheduling algorithm. The technical problems that in the prior art, a control layer and a hardware layer of the multi-voltage bus hybrid micro-grid are independent of each other, a cooperative relation is lacked, and the dynamic self-adaptive adjustment type is poor are solved.

A method of transmitting power by a wireless power transmitter, the method including receiving a plurality of packets including a foreign object detection (FOD) status packet from a wireless power receiver; determining whether a foreign object is present in a charging area of the wireless power transmitter on the basis of the FOD status packet; and transmitting, to the wireless power receiver, a response signal indicating whether the foreign object is present in the charging area of the wireless power transmitter on the basis of a result of the determination, wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver, wherein the plurality of packets further include at least one of a signal strength packet, an end power transfer packet, a power control hold-off packet, a control error packet, a renegotiation packet, an eight-bit received power packet, and a charging status packet, to which a byte encoding technique is applied, and wherein the byte encoding technique is a technique of inserting a start bit, a stop bit, and a parity bit into an encoded binary bit stream of a packet having a length of eight bits.

This invention relates to a method, apparatus, equipment, and medium for optimizing the operation of a flexible interconnected distribution network. The method includes: approximating the nonlinear power flow calculation equations of the AC portion of the AC / DC distribution network to construct a DC power flow model for the AC portion; approximating the nonlinear power flow calculation equations of the DC portion of the AC / DC distribution network to construct a DC power flow model for the DC portion; constructing an optimized operation model for the flexible interconnected distribution network, with the goal of minimizing network losses and using the DC power flow models of the AC and DC portions as constraints; solving the optimized operation model to obtain an optimized operation scheme for the flexible interconnected distribution network; and controlling the operation of the flexible interconnected distribution network using the optimized operation scheme. This invention avoids cone relaxation of large-scale nonlinear constraints, improving the efficiency of optimization calculations.

A resilient on-site microgrid system includes a multiport power router directly connected to various energy sources, including batteries, renewable energy sources, and broader grid power, as well as various loads, including electric vehicle chargers. The multiport power router dynamically adjusts power provided from the various power sources and to the various loads, especially to power devices in a nearby facility. The microgrid system includes various bypass systems allowing for powering of critical loads in the event of failure of individual components or pathways within the microgrid system.

A resilient power router system with simplified connection to various energy sources, including batteries, renewable energy sources, and broader grid power, as well as various loads, including data centers. The multiport power router dynamically adjusts power provided from the various power sources and to the various loads, especially to for medium voltage applications. The multiport design enables scalability to multi-megawatt (MW) and medium voltage levels.

The present disclosure provides a method and a wireless power receiver for communicating with a wireless power transmitter. The method comprises: receiving, by the wireless power receiver, a power signal having a predetermined strength from the wireless power transmitter; transmitting, by the wireless power receiver, a data packet comprising a mode bit field to the wireless power transmitter, the mode bit field indicating whether the data packet comprises a reference peak frequency of the wireless power receiver, wherein the reference peak frequency is pre-assigned to the wireless power receiver; and receiving, by the wireless power receiver, a response from the wireless power transmitter indicating a presence or absence of a foreign object in a charging area, wherein the response is determined based on a comparison of a peak frequency of a measured power signal and an adaptive threshold frequency adjusted based on the reference peak frequency.

The invention discloses an AC-DC hybrid power distribution system, and belongs to the technical field of power distribution control. The device is applied to a low-voltage side of a distribution transformer area of a power distribution network and supports alternating-current power distribution and direct-current power distribution at the same time. Comprising an MPR controller, an alternating-current power distribution unit and a direct-current power distribution unit which are arranged in a power distribution cabinet, and the MPR controller is connected with the alternating-current power distribution unit and the direct-current power distribution unit for bidirectional communication; the medium-voltage direct-current bus is connected with the alternating-current power distribution unit through a bidirectional four-leg PCS and is connected with the direct-current power distribution unit; the bidirectional four-bridge-arm PCS realizes electric energy bidirectional conversion between the AC power distribution unit and the medium-voltage DC bus, and provides a stable DC power supply for the DC power distribution unit. According to the invention, scenes such as rated grid connection and margin absorption of photovoltaic power generation are formed by adding energy storage and micro-grid control, so that the stability of power supply is ensured; the bidirectional four-bridge-arm PCS is used for solving the electric energy quality problems of three-phase imbalance, harmonic waves, reactive compensation and the like.

The application discloses a kind of AC-DC distribution network distributed robust state estimation method based on intelligent electric meter data, the method utilizes historical state to predict the state interval of current time, and based on nonlinear optimization model is corrected to ensure the rationality of predicted interval;Then, the nonlinear equation scaling method based on mean value theorem is used to convert the nonlinear interval SE model into a linear optimization model, to ensure the completeness of the estimation interval.The algorithm proposed in the application can accurately obtain the interval information of AC-DC distribution network state in weak observable AC-DC distribution network under high proportion of new energy penetration, and provide technical support for subsequent safety evaluation and optimal operation.

The invention relates to a power supply for a microscope system, in particular for analyzing a sample, comprising: an optical microscope unit; an energy conveyor for a power grid current; at least one alternating current consumer supplied with a grid current via the energy conveyor; at least one DC electric appliance; a power grid component configured to convert a power grid current from the energy source conveyor into a direct current, where the at least one direct current consumer is supplied with the direct current via the power grid component; and at least one electrical main switch, in particular a manual electrical main switch, which is arranged in the energy source conveyor and is configured for interrupting the grid current for the at least one alternating current consumer and the grid component.

Systems and techniques may generally be used to individually and selectively enable or disable a plurality of power channels based on detection of activity (or lack thereof) on a workstation. An example system may include a medical cart battery and a power channel for connecting peripheral devices. The system may incorporate an inertial measurement unit (IMU) sensor interface for monitoring cart functions. The system may include a controller in communication with the sensor interface and battery to determine if connected peripheral devices should be powered off based on IMU sensor data. The controller may generate power control instructions which may be executed by a power switch that enables or disables the power channel accordingly. The system may provide automated power management for peripheral devices based on cart movement and usage conditions detected by the IMU sensor.

A method of receiving power by a wireless power receiver, the method including transmitting, to a wireless power transmitter, a plurality of packets including a foreign object detection (FOD) status packet; and receiving, from the wireless power transmitter, a response signal indicating whether a foreign object is present in a charging area of the wireless power transmitter, wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver, and wherein the plurality of packets further include at least one of a signal strength packet, an end power transfer packet, a power control hold-off packet, a configuration packet, an identification packet for transmitting receiver identification information, an extended identification packet, a general request packet, a special request packet, a control error packet, a renegotiation packet, a 24-bit received power packet, an eight-bit received power packet, and a charging status packet.

The invention relates to the technical field of power supply management and control, in particular to an integrated comprehensive power supply control method and system, and the method comprises the steps: obtaining first current data corresponding to a main commercial power A, second current data corresponding to a standby commercial power B, and comprehensive power distribution system information, a first adjusting switch, a second adjusting switch, a third adjusting switch and a fourth adjusting switch are determined according to the comprehensive power distribution system information, and if the first current data and the second current data are normal, the first adjusting switch, the second adjusting switch, the third adjusting switch and the fourth adjusting switch are controlled to be turned on at the same time; the main circuit mains supply A serves as the main power supply input of the load AC side of the IT cabinet and the auxiliary power supply input of the HVDC system, the standby circuit mains supply B serves as the main power supply input of the HDVC system, and the HVDC system serves as the main power supply input of the load DC side of the IT cabinet and the main power supply input of the AHU cabinet. The overall reliability and the utilization rate of the power supply system are improved.

The current disclosure provides a microscope system for analyzing samples, comprising: an optical microscope unit; a power supply for mains electric power; at least one alternating current load which is supplied with mains electric power via the power supply; at least one direct current load; a power supply unit which is set up to convert the mains electric power from the power supply into direct current, wherein the at least one direct current load is supplied with direct current via the power supply unit; and at least one electric main switch which is arranged in the power supply and which is set up to interrupt the mains electric power for the at least one alternating current load and the power supply unit. In at least some embodiments, the at least one electric main switch is in a manual switch.

To provide a foreign matter detection method for wireless charging, and a device and a system therefor.SOLUTION: A foreign matter detection method in a wireless power transmitter with a resonance circuit for wirelessly transmitting power comprises steps of: sensing an object placed in a charging area; measuring a quality factor value of the resonance circuit when the object is sensed; transmitting a sensing signal to identify a wireless power receiver; determining a critical value for detecting a foreign matter on the basis of a reference quality factor value received from the identified wireless power receiver; and comparing the measured quality factor value with the determined critical value to determine presence / absence of the foreign matter. The critical value is determined by applying a weight increasing by the reference quality factor value.SELECTED DRAWING: Figure 9a

A domestic appliance has at least one functional unit from the group of pump, heating device, fan, motor, actuators, treatment chamber or treatment surface and an electrical connection to the outside for connection to an external energy supply such as an electricity supply network or a photovoltaic system, the energy supply being able to provide DC voltage or AC voltage. A power supply supplies the functional units with the required electrical power. Provided between the power supply and the electrical connection is an adapter switching unit which detects DC voltage or AC voltage at the electrical connection and adjusts to the respective voltage type. Said adapter switching unit is designed as a standalone and independent module. The adapter switching unit supplies the power supply with DC voltage and has a power supply unit or a switched-mode power supply unit or a converter. An energy distribution module is arranged between the adapter switching unit and the power supply.

A kind of AC power supply system for power supply end can be grounded, in the scheme, the input end of power electronic transformer is connected with medium-high voltage network, and the output end is connected with the low-voltage DC bus;The input end of the low-voltage inverter DC / AC device is connected with the low-voltage DC bus, and the output end is connected with low-voltage AC load and grounded;Multiple non-isolated DC / DC device input end is connected in parallel to the low-voltage DC bus, and the output end is respectively connected with low-voltage DC load.In the scheme, three-phase four-wire or three-phase five-wire system is constructed in AC power supply side, the problem of lack of ground line system when three-phase three-wire system inverter is powered is solved.In addition, star-connected capacitor is installed on the output side of low-voltage inverter DC / AC device and connected with the input side of non-isolated DC / DC device, low-impedance loop of common-mode voltage is constructed, common-mode voltage from DC side to AC side can be effectively suppressed, and the problem of common-mode voltage of non-isolated AC power supply circuit being too large to interfere with power supply process is solved.

The utility model provides a multi-output shore power device, which comprises a user switch cabinet and a shore power supply device, the shore power supply device comprises a wire inlet cabinet, a metering cabinet, a frequency converter cabinet, an isolation transformer, a current limiting cabinet and a wire outlet switch which are electrically connected with one another, and the front of the user switch cabinet is connected with a bus and the rear of the user switch cabinet is connected with the wire inlet cabinet; the output end of the outgoing line switch is connected with the shore power output port; and at least one group of power frequency output bypass devices are connected in parallel with the frequency converter cabinet and are connected with the shore power output port. By additionally arranging a high-voltage vacuum contactor, random selection of 50Hz and 60Hz is realized, and simultaneous power supply is realized; the shore power supply output mode is changed into VBF control, any low-voltage ship can be carried, and two low-voltage ships can be carried at the same time.

The disclosure provides an energy station system, a control method of the energy station and an energy station. The energy station system includes at least one input energy source, at least one load, at least one central control module, and a switchable energy module. The switchable energy module switches its own working state based on a supply-demand relationship between the input energy source and the load, and the central control module controls the input energy source to supply power to the load. Through arranging the switchable energy module, it may be used to switch its working state according to the supply-demand relationship between the input energy source and the load, so as to supplement the supply and demand imbalance between the input energy source and the load as characteristics of the input energy source or a DC load.

The invention provides a multi-port alternating current and direct current multiplexing power supply device. Through the dynamic switching of the AC / DC multiplexing interface module and the collaborative architecture of the multi-port DC interconnector module, the intelligent reconstruction of a hardware circuit and the flexible configuration of an energy path are realized. The AC / DC multiplexing interface module automatically switches an AC rectification / inversion mode or a DC buck-boost mode according to the power distribution type, thereby solving the limitation that a conventional device only supports a single type of port. The multi-port direct-current interconnector module establishes a reconfigurable energy path through a switching signal driven by hierarchical logic, so that the voltage conversion range is expanded while the transmission loss is reduced. Multi-mode operation intervals are divided in real time in an actual application scene, energy supply of high-priority ports is guaranteed preferentially, power decoupling is achieved through the inductor energy storage characteristic, the problems in the aspects of voltage gain and transmission power in a traditional scheme are solved, and the light-weight and high-compatibility power supply device is formed.

An energy distribution system is provided that includes a first AC bus; a second AC bus for connecting to at least one second AC load; a third AC bus for connecting to a supply network; a transformer that converts an alternating voltage of each of the first to third AC buses into an alternating voltage of each of the other of the first to third AC buses; a DC bus; an energy storage device connected to the DC bus; and a bidirectional AC-DC power converter that is connected between the first AC bus and the DC bus.

The invention relates to a bridge-land networking power supply system and method suitable for a long-distance cross-sea bridge, and the system comprises an offshore power module which converts renewable energy into electric energy based on various offshore power generation stations; the bridge power supply module is used for converting renewable energy into electric energy based on various bridge floor up-and-down power generation stations; the bridge energy storage module is used for storing and releasing the electric energy generated by the power supply module based on various bridge floor up-down energy storage power stations; the bridge power supply module meets the requirements of various electric facilities based on up-down power supply equipment on the bridge floor; the bridge-land networking module is used for laying a power transmission line based on a bridge frame, connecting the offshore power supply module, the bridge power supply module, the bridge energy storage module, the bridge power supply module and the intelligent control module into a whole, and interconnecting with land power grids on two sides of the bridge; and the intelligent control module carries out calculation by taking the first meeting of the power supply of the bridge as a target, and judges the power transmission direction and scale between the bridge-land networking module and land power grids on the two sides of the bridge.