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8195 results about "Busbar" patented technology

In electric power distribution, a busbar (also bus bar) is a metallic strip or bar, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution. They are also used to connect high voltage equipment at electrical switchyards, and low voltage equipment in battery banks. They are generally uninsulated, and have sufficient stiffness to be supported in air by insulated pillars. These features allow sufficient cooling of the conductors, and the ability to tap in at various points without creating a new joint.

A digital high voltage DC power

The utility model relates to a digitized high voltage direct current power supply, and comprises a main power circuit, a digitized control circuit based on DSP and a control program of host computer based on PC, wherein the main power circuit comprises a three phase rectifying element [1], a soft start element [2], a filter element [3], a resonance inverting element [4], a high frequency and high voltage transformer [5], a doubling circuit [6] and a two-stage voltage divider [7]; the digitized control circuit based on DSP comprises an interface circuit of IPM drive signal, a high voltage feedback element, a resonance overcurrent protection element, a soft start circuit and a serial communication interface circuit. The voltage of power frequency electrical network is converted into DC voltage which is used as busbar voltage by three phase rectification, soft start and filter, and the busbar voltage is converted into 20KHz quasi-sine-wave by the resonance inverting element which is driven by a phase difference computed by the DSP according to feedback signal, and then 0-100Kv AC high voltage is output by the high frequency and high voltage transformer [5] and the doubling circuit [6]. The utility model adopts a host computer as a control device, and outputs the voltage via the control instructions of the DSP, therefore meets the requirements of voltage withstand test of insulation material.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Direct-current microgrid system and energy management method thereof

The invention provides a direct-current (DC) microgrid system and an energy management method thereof. A power generation unit comprises a large user-side power grid and a grid-connected alternating current / direct current converter (AC / DC) thereof, a lithium iron phosphate energy storage system (EMS) and an energy storage direct current / direct current converter (DC / DC), and a photovoltaic power generation system and a photovoltaic DC / DC thereof. The DC microgrid system is provided with EMS and a wireless sensor network thereof, wherein the wireless sensor network is communicated with the grid-connected, energy storage and photovoltaic DC / DC; the EMS is used for executing different control strategies and optimizing the operation of a DC microgrid; the voltage of a DC busbar is stabilized by controlling a DC busbar voltage outer loop and an output inductive current inner loop through the grid-connected AC / DC when a grid-connected operation is switched to an islanding operation; and the islanding operation is switched to an operation using the energy storage DC / DC as a voltage source, i.e. the voltage stability of the DC busbar is maintained by controlling the DC busbar voltage outer loop and the inductive current inner loop on the energy storage side of a battery within the time of at most 20ms. Therefore, a seamless switching requirement is met, uninterrupted power supply (UPS) of loads in a telecom data center is realized, and configuration of reactive-load compensation equipment is avoided.
Owner:深圳微网能源管理系统实验室有限公司

Methods and systems for forming a protected disconnectable joint assembly

A method for forming a protected disconnectable joint assembly includes providing a disconnectable joint assembly. The disconnectable joint assembly includes: an electrical transmission power cable including a conductor and a cable insulation layer covering the conductor, the conductor having a terminal end; an electrically conductive cable connector affixed to the terminal end of the power cable and having a connector coupling portion; a busbar including an electrically conductive busbar body, a busbar coupling portion extending from the busbar body, and a busbar insulation layer covering the busbar body; and a disconnectable coupling mechanism mechanically securing the cable coupling portion to the busbar coupling portion to provide a joint between the cable and the busbar. The disconnectable coupling mechanism is selectively operable to disconnect the cable connector from the busbar without severing the cable. The method further includes: providing a joint cover assembly including a tubular, elastomeric cold-shrinkable sleeve body; maintaining the joint cover assembly in an expanded state using a removable holdout device mounted within the sleeve body; mounting the joint cover assembly on the holdout over the joint between the cable and the busbar; and thereafter removing the holdout device from the joint cover assembly to release the sleeve body to contract onto the disconnectable joint assembly such that the sleeve body circumferentially surrounds the joint between the cable and the busbar, overlaps portions of the cable insulation layer and the busbar insulation layer adjacent the joint, and applies a persistent radially compressive load on the cable insulation layer and the busbar insulation layer.
Owner:TE CONNECTIVITY CORP

Method for estimating surplus mileage of pure electric vehicle based on power consumption per kilometer

The invention relates to a method for estimating surplus mileage of a pure electric vehicle based on power consumption per kilometer, which comprises the following steps that: 1, an HCU (hybrid vehicle control unit) receives a message sent by a BCU (battery control unit) through a bus, busbar voltage U[bus], busbar current I[bus], and SOC of a battery pack are extracted from the message; 2, the HCU receives a message sent by an ABS (antilock brake system) controller through the bus, and a speed signal v is extracted from the message; 3, an available battery capacity B of the current battery pack being equal to B[Ah]*(SOC-SOC[lower limit]) is obtained according to the current available SOC, the use limitation of the SOC and the total capacity B[Ah] of the battery pack Ah; 4, an available battery energy E[available] of the battery pack being equal to U[bus]* B[available] can be calculated according to the busbar voltage U[bus] and the available battery capacity B of the current battery pack; and 5, surplus mileage S[surplus] being equal to E[available]/W[average] can be calculated according to the power consumption per kilometer W[average] and E[available]. The method automatically takes external influencing factors into consideration, so standardization processed through vast of experiments is unnecessary, and the accuracy is higher.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD +1

Electric source system of track traffic locomotive and control method of electric source system

The invention provides an electric source system of a track traffic locomotive. The electric source system comprises a direct current busbar for directly providing electricity for the locomotive, and a locomotive direct current load connected with the direct current busbar, wherein a bidirectional electric source release and absorption device is arranged between the direct current busbar and the locomotive direct current load. When the track traffic locomotive is started and braked, the electric source system has the effect of smoothing the voltages of an electrical network, and the influence of the track traffic locomotive on the electrical network is reduced; when the track traffic locomotive is braked, energy generated in the braking process of the track traffic locomotive can be recovered, so that the utilization efficiency of energy resources is improved, and the purposes of energy conservation and environmental protection are achieved; when the track traffic locomotive has electricity supply failure due to the locomotive or the electrical network, emergency towing can be started, so that the locomotive is towed to a safe position, the situation that the locomotive occupies lines is avoided, the operation efficiency is improved, and urgent failure handling capacity is improved. The scheme adopted by the electric source system is upgraded based on an original standby electric source, so that space usage is small, and the technology cost is reduced; according to the residual capacity of current batteries, an emergency towing scheme can be automatically made, and the control is more intelligentized.
Owner:惠州美亿瑞创电气设备有限公司

Control method for enhancing asymmetrical fault ride-through capability of wind power system

The invention discloses a control method for increasing asymmetrical fault ride-through capability of a wind power system. In the method, a super capacitance energy storage system is assessed between a machine side rectifier and a net side inverter on the basis of the prior art. On the control aspect, besides the control for the machine side rectifier and the net side inverter, the control for a super capacitance energy storage system is additionally provided in the method. Through controlling the coordination of the machine side rectifier and the net side inverter, a unit can realize the maximum wind energy tracking, grid-connected active and reactive power adjusting and grid-connected three-phase current symmetry and the stability of the voltage for a direct-current busbar between the machine side rectifier and the net side inverter when a power grid is normal is assured. The additionally provided super capacitance energy storage system is further controlled, the voltage stability of the direct-current busbar of the unit while the power grid has asymmetrical faults is assured, especially the grid-connected three-phase current symmetry is assured and the double power frequency ripple wave of the voltage of the direct-current busbar while the power grid has asymmetrical faults is removed so that the asymmetrical fault ride-through capability of the wind power system is enhanced.
Owner:CHONGQING UNIV
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