539results about How to "Reduce capacity requirements" patented technology

A write-caching RAID controller is disclosed. The controller includes a CPU that manages transfers of posted-write data from host computers to a volatile memory and transfers of the posted-write data from the volatile memory to storage devices when a main power source is supplying power to the RAID controller. A memory controller flushes the posted-write data from the volatile memory to the non-volatile memory when main power fails, during which time capacitors provide power to the memory controller, volatile memory, and non-volatile memory, but not to the CPU, in order to reduce the energy storage requirements of the capacitors. During main power provision, the CPU programs the memory controller with information needed to perform the flush operation, such as the location and size of the posted-write data in the volatile memory and various flush operation characteristics.

This invention proposes a method for completing an interval of an open-hole injection wellbore penetrating a subterranean formation, said wellbore being communicating with the formation by way of an interface that comprises at least a filter cake invaded zone comprising bridging materials and other embedded solid materials, said method comprising the steps of injecting a clean-up fluid and contacting it with the filtercake for a period of time sufficient to loose some of the other solids embedded in the filter cake; removing the loosened solids by a high-rate displacement fluid comprising suspending additives; and then injecting a dissolving fluid comprising a diverter and an effective amount of a salt or acid capable of dissolving the bridging material.

A data storage system and method for simultaneously providing thin provisioning and high availability. The system includes external storage volume and two storage subsystems coupled together and to external storage volume. Each of storage subsystems includes disk drives and a cache area, each of the storage subsystems includes at least one virtual volume and at least one capacity pool. The virtual volume is allocated from storage elements of the at least one capacity pool. The capacity pool includes the disk drives and at least a portion of external storage volume. The storage elements of the capacity pool are allocated to the virtual volume in response to a data access request. The system further includes a host computer coupled to the storage subsystems and configured to switch input / output path between the storage subsystems. Each of the storage subsystems is adapted to copy received write I / O request to other storage subsystems. Upon receipt of request from another storage subsystem, storage element of the capacity pool of storage subsystem is prevented from being allocated to the virtual volume of that storage subsystem.

A system and method for determining and communicating a traffic anomaly at a point to at least one receiving vehicle includes a traffic information center and at least one probe device. Each probe device is configured to determine and store within an on-board database a current value of a condition at the point during each of a plurality of trips, so as to build a history of condition values. The probe device is further configured to compare the current value to the historic values during each trip, and selectively transmit notification of an anomalous value to the center.

The invention relates to a power loop test method for a steady-state operation test of a flexible direct current power transmission MMC (Modular Multilevel Converter) valve. The method comprises the following steps of: setting voltage amplitudes V1 and V2 of valve banks 1 and 2 and phase difference delta of the two voltage amplitudes and setting output voltage of an energy replenishing power source E2; closing an isolating switch K1 and charging a sub-module capacitor by a charging power source E1; cutting off K1 to exit E1 to finish pre-charging after the voltage of the sub-module capacitor reaches a set value; closing an isolating switch K2 and switching to the energy replenishing power source E2; meanwhile, sending out trigger pulses of IGBTs (Insulated Gate Bipolar Translator) of all sub-modules of the two valve banks according to a modulation strategy and getting a circuit in a steady-state running state; establishing voltage stress required by test at the two ends of the valve banks 1 and 2, performing energy exchange on sub-module capacitors and load reactors of two valve components and generating current stress required by the test in a loop; and cutting off K2 and exiting E2, latching the trigger pulses of the IGBTs in the sub-modules and finishing the test. The test method is simple and flexible; and a test parameter adjustment method is simple and convenient.

The invention relates to an optimization method in the field of power system automation, in particular to a layered optimization method of a regional distribution network comprising a micro-grid. The method includes the following steps: (1) building a micro-grid and distribution network combined dispatching model; (2) building an efficiency-maximizing secondary dispatching model of the micro-grid; (3) optimizing the two dispatching models. According to the method, the micro-grid is taken as a controllable unit capable of dispatching independently; through coordinated dispatching of a controllable distributed power supply on the distribution network side, the micro-grid and the distribution network and bi-layer dispatching control of economic dispatch of distributed energy resources inside the micro-grid, the distributed energy resources are used in a maximized manner internally, the regional distribution network power supply and loads are dispatched optimally externally, and acceptance capability of the distraction network to the distributed power supply can be effectively improved.

Data processing methods and systems are disclosed for use in industrial control. The methods and systems may include receiving control data from automation components of an industrial control system by a first computer system, the first computer system being coupled to the automation components by means of a first network, storing at least some of the control data in a first database by the first computer system, performing a database query of the first database for determination of a subset of the control data, aggregating the control data of the subset, and transmitting the aggregated control data to a second computer system over a second network.

The invention provides a back-to-back test method of a VSC-HVDC MMC valve stable state operation test. Devices used in the method comprise a rectification side, an inversion side and a supporting capacitor. The rectification side and the inversion side are in parallel connection at two sides of the supporting capacitor respectively to form a back-to-back circuit. Through controlling submodules of valve modules of the rectification side and the inversion side, stable state operation voltage, current and heat intensity equal to actual condition are obtained. According to the invention, the rectification side and the inversion side share a power supply, active power emitted by the power supply returns to the power supply, a power supply capacity requirement is reduced at the most; the valve modules of the invention are selected from an actual engineering, a test circuit operation principle and a control strategy have high similarity with MMC in the actual engineering, and necessary effective valve operational reliability investigation means and control strategy verification environment are provided for the MMC before investing in practical application.

A decoder for layered low-density parity-check code and a decoding method in the technical field of communication, wherein the amount of processing module is equal to the parallelism k of the decoder; a first memory cell sends the soft value (bit updating value) transmitted from the information node to the check node in this time of iteration into the processing module; the processing module sends the soft value (check updating value) transmitted from the check node to the information node in this time of iteration into a second memory cell; the second memory cell sends the check updating value transmitted from next layer of check node to the information node in the last iteration to the processing module through a second blending network; the processing module sends the bit updating value transmitted from the information node to next layer of check node in this time of iteration to the first memory cell through a first blending network. In the method, the calculation of layered and modifying minimum sum as well as overflow protection are adopted for node information updating. The invention improves processing efficiency greatly and reduces hardware resource consumption needed by decoder.

The invention provides a PFC (power factor correction) control method with high input power factor and a control circuit thereof. The method comprises the steps of controlling a switching tube to be switched on and switched off according to the principle of leading impulse area to be equivalent, and leading input inductive current and sinusoidal half-wave current to have the equivalent impulse area in each switching period, thereby realizing the high power factor (PF); furthermore, the higher the switching frequency, the closer to 1 the PF value is. In the control circuit, a circuit topological structure of a Boost converter and a control circuit for realizing a variable duty ratio sequence jointly constitute a PFC stage of a commonly used LED (light-emitting diode) driving power supply, the front stage of the PFC stage is connected with the output end of a non-controllable rectifier bridge of a single-phase diode via an input filter capacitor, the back stage of the PFC stage is connected with a DC / DC (direct current / direct current) stage of the commonly used LED driving power supply via an output filter inductor and an output filter capacitor. By adopting the PFC control method, not only the very high input power factor can be realized, but also output voltage ripple can be reduced; furthermore, the control circuit is simple and easy to realize an analog circuit, thereby being conductive to large-scale integration.

The present invention discloses an energy-feedback type power quality disturbance generating device, which relates to a power quality disturbance generating device. The device comprises a harmonic source (1), a feedback link (2), a middle direct current capacitor (3), a control terminal (4), a first LCL filtering link (5), and a second LCL filtering link (6). The control terminal (4) adopts a DSP controller to realize that a control signal which is generated according to the setting of a user controls the harmonic source to partially generate current disturbance. The harmonic source and the feedback link are cascaded via the middle direct current capacitor to form an AC-DC-AC topological structure so as to realize power feedback. The alternating current side of the harmonic source is connected with a power network via the first LCL filtering link. The alternating current side of the feedback link is connected with the power network via the second LCL filtering link. The device is capable of simulating harmonic current, active current, inductance reactive current or capacitive reactive current of a plurality of combination frequencies, and the device is capable of simulating various working conditions of a plurality of nonlinear loads such as electric arc furnaces, medium frequency furnaces, welding machines and frequency converters, etc.

The invention discloses a hybrid power energy management system of a trolley car and a control method. The system comprises a fuel cell array, a one-way isolation type DC-DC (direct current) converter in cascade connection with the fuel cell array on the basis of a full-bridge no-voltage no-current switch topological structure, a storage battery, a two-way isolation type DC-DC converter in cascade connection with the storage battery on the basis of a full-bridge no-voltage no-current switch topological structure, a supercapacitor, a two-way isolation type DC-DC converter in cascade connection with the supercapacitor on the basis of a full-bridge no-voltage no-current switch topological structure, an energy management unit based on a DSP (digital signal processor) controller, an interface extension unit based on an FPGA (field programmable gate array) controller, a voltage acquisition and conditioning circuit, a current acquisition and conditioning circuit, a weak current supply unit and a brake resistor. The system can supply energy to a load quickly, the response speed of the system to the load is increased, the brake power can be recovered as much as possible, the fuel availability is improved, the purpose of fuel economy is achieved, the service life of the storage battery is prolonged, and the cost is reduced.

The battery charging apparatus has an auxiliary battery 1, a first charging circuit 20 for charging the auxiliary battery 1 with a first charging current derived from an externally connected commercial power source AC, and a second charging circuit 30 for charging the load battery LB with a second charging current that is higher than the first charging current and is derived from power from the auxiliary battery 1, which is charged by the first charging circuit 20. The first charging circuit 20 is connected to allow power supply to the auxiliary battery 1 and the second charging circuit 30. This makes charging circuit switching unnecessary and eliminates the need for components such as high-power switching devices. The charging apparatus has the positive features that stability and reliability are improved, and the load battery can be charged with the auxiliary battery 1 in a shorter time than using commercial power.

The invention provides a multi-unit device and a method for synchronically charging and discharging an accumulator. A main controller is respectively connected with a rectification (inversion) unit, a DC-DC converter unit, and an upper computer. The main circuit structure of the main controller comprises a front circuit part and a back circuit part. With the space vector pulse width modulation (SVPWM) technique used in the front circuit part of the inventive device, the power factor is approximately 1 in the charging mode and approximately -1 in the discharging mode, so as to improve the energy utilization efficiency, therefore, reducing the capacity requirement of an isolation transformer, and costs of other hardware. Meanwhile, the harmonic wave content is decreased and the pollution to a power grid is reduced. The device is in parallel connected with a plurality of independent two-way DC-DC converters, when a plurality of groups of battery units are synchronically charged or discharged, the residual electricity released by certain batteries can be charged into other batteries without passing through the power grid, so as to improve the service efficiency of the battery residual electricity and save electricity expenditure.

The invention relates to a low-voltage ride through control system and a low-voltage ride through control method for a capacity-optimal energy-storage type double-fed motor. The low-voltage ride through control system comprises a power grid, a coupling transformer, a double-fed induction generator (DFIG), a grid-side converter, a rotor-side converter, a DC (Direct Current)-side capacitor, a geared head and a fan, wherein one path of the power grid is directly connected with the DFIG through the coupling transformer, and another path of the power grid passes through the grid-side transformer, the DC-side capacitor and the rotor-side converter in sequence and is connected with the DFIG; a DC-side energy storage device is connected with the DC-side capacitor through a bidirectional DC / DC converter; and the DFIG is connected with the fan through the geared head. The low-voltage ride through control system and method have the advantages of improving the low-voltage ride through capability of a DFIG wind power generation system when the voltage of the power grid sharply drops, ensuring the fault ride-through of the DFIG, improving the supporting capability of the DFID wind power generation system on the voltage of the power grid during fault, providing a measure for reducing the requirement of the DFIG on the capacity of the energy-storage device in the process of realizing the low-voltage ride through and greatly reducing the cost of the energy storage device.

The invention discloses a hen house environment ammonia gas concentration intelligent monitoring system which is composed of two parts of a hen house environment parameter acquisition platform and a hen house environment ammonia gas concentration intelligent prediction model. The hen house environment ammonia gas concentration intelligent monitoring system based on a CAN field bus is designed in view of difficulties that hen house environment ammonia gas concentration change has characteristics of non-linearity, high time lag, high inertia and time variation and hen house area is relatively large and ammonia gas concentration is difficult to accurately predict. The system is the intelligent monitoring system which realizes detection, intelligent prediction and management of the monitored hen house environment ammonia gas concentration by the hen house environment parameter acquisition platform and the hen house environment ammonia gas concentration intelligent prediction model, and the basis of performing high-quality and high-efficiency purification on hen house environment ammonia gas concentration is provided. The system has wide application prospect and great popularization value.

A sample nucleic acid sequence is compared against a database to find a matching sequence. In one embodiment, this comparison is accomplished with a table look-up approach that involves using sequences with collapsed homopolymer regions.

The invention provides a method for remote upgrade of a digital signal processor (DSP) program. The method comprises that (1) an SCI BootLoader module judges whether the DSP needs to upgrade according to an upgrade judgment flag bit in EEPROM, if the DSP program needs to be upgraded, the SCI BootLoader module is initialized and upper computer information is received, or the DSP program jumps to entrance of the main program, and the upgrade is over; (2) a CKFA module performs CSM deblocking, if the deblocking is successful, the automatic Baud rate detection is conducted and the upper computer information is received, received binary files are programmed to FLASH to verify programming results, and if the deblocking fails, the DSP program jumps to the entrance of the main program, and the upgrade is over; and (3) the upper computer is matched with the SCI BootLoader module and the CKFA module to perform the remote upgrade. According to the remote upgrade method, the remote upgrade can be performed without the opening of a protection box of the DSP system, and the remote upgrade method has the advantages of being convenient and flexible and easy to achieve. The extra boot time does not exist, the requirement for RAM capacity is low, the power off risk does not exist, and the upgrade is stable and reliable.

The electrically variable transmission family of the present invention provides low-content, low-cost electrically variable transmission mechanisms including first, second and third differential gear sets, a battery, three electric machines serving interchangeably as motors or generators and at least one brake operable to enable series hybrid reverse operation. The three motor / generators are operable in a coordinated fashion to yield an EVT with a continuously variable range of speeds (including reverse).

The invention relates to the technical field of computers, in particular to a mixed memory data backup system and method. The system is applied to the storage of data of a dynamic random access memory (DRAM) into a non-volatile memory. The system comprises: a user configuration module, used for selecting to-be-backed-up data from the data, carrying out priority determination on the to-be-backed-up data, determining a backup order of the to-be-backed-up data according to priority determination, generating state information of the to-be-backed-up data and sending the state information; a DRAM module, which is connected to the user configuration module, and dynamically and randomly accesses the data; a TABLE module, which is connected to the DRAM module and the user configuration module, and stores the state information of the to-be-backed-up data in the DRAM module; an NVM module, which is used to backup partial data and carry out nonvolatile storage on the partial data; and a controller, which is connected to the DRAM module, the NVM module and the TABLE module, and stores the data from the DRAM module to the NVM module according to the state information of the to-be-backed-up data in the DRAM module in the TABLE module.

The invention relates to a detection method for a modular multi-level converter (MMC) steady state operation tester. The tester comprises a valve component 1, a valve component 2, a charging source E1, an energy complementing source E2, a load reactor L, a charging current-limiting resistor R, a control system, and a measurement and acquisition cabinet, wherein the valve component 1 and the valve component 2 are connected with the charging current-limiting resistor R through the serially connected load reactor L; the charging source E1 and the energy complementing source E2 are connected with the valve component 1; and the valve component 1 and the valve component 2 are connected with the control system. The method comprises the following steps: (1) detecting a cooling circuit; (2) detecting the isolation of a valve tower; (3) detecting average pressure tests; (4) detecting communication; (5) detecting control; and (6) performing a system test. By the method, whether the functions of the MMC steady state operation tester are complete and perfect can be detected, and equipment safety can be ensured in the debugging process.

The invention discloses an alternating current / direct current transient steady state integrated detection device. The alternating current / direct current transient steady state integrated detection device includes an alternating current / direct current transient steady state integrated test power source and an electronic type current transformer field test detection system; the alternating current / direct current transient steady state integrated test power source includes a direct-current impact power source, a direct-current transient steady state power source, an alternating current power frequency transient steady state power source and a combined loop control system; and the electronic type current transformer field test detection system includes a standard transformer, a standard conversion device and a transformer composite error tester. With the detection device adopted, transient steady state integrated tests of a direct current transformer and an alternating current transformer can be realized separately. With a method according to which a combined test loop composed of the direct-current impact power source, the transient steady state test power source and the alternating current transient steady state test power source is adopted, the capacity of an energy-storage capacitor in a direct-current impact / transient steady state test can be obviously decreased, and important parameters such as a transient current peak value, a decay time constant and step current response can be adjusted and configured more flexibly and accurately.

The invention discloses a mobile charging method and device for an electric vehicle. The method comprises that a special-purpose charging lane is constructed beside a road, a high-frequency ac bus is laid under the lane, and multiple transmitting coils are connected with the ac bus in parallel to form an array; the tail end of the bus is connected with a shared adjustable resonant capacitor in series, and one or multiple transmitting coils and the shared adjustable resonant capacitor form an LC (Inductor-Capacitor) serial resonance circuit; and electric energy is transmitted via resonant coupling between the transmitting coils and a receiving coil of the electric vehicle, thereby charging a storage battery of the electric vehicle. The method and device of the invention can continuously and uninterruptedly charge the moving electric vehicle, thereby effectively lowering the requirement for the capacity of the battery, improving the endurance capability of the electric vehicle, reducing the pressure on the electrical work due to rapid charging, and being helpful for prompting large-scale applications of distributed power generation and electric vehicles.

The invention discloses a soft starting control method of a dual-active bridge DC converter applied to an intelligent power distribution network. According to the soft starting control method, a primary-side full bridge is unlocked, a secondary-side full bridge and closed-loop control of an external shift phase angle are shunted, the primary-side full bridge employs chopping control, a switch tubeQ3 and a switch tube Q4 are complementarily conducted at a duty ratio of 50%, the switch tube Q3 and the switch tube Q4 employs variable-duty ratio control, and the period of each switch is increasedat a certain step; when a secondary-side voltage is raised enough to drive the switch tubes and the duty ratios of a switch tube Q1 and a switch tube Q2 both are increased to 0.99, the secondary-sidefull bridge and the closed-loop control of the external shift phase angle are unlocked; and when an output voltage reaches a rated value, a load is switched, the output voltage is stable, and the starting process is completed. By the soft starting control method, the current overshoot of the dual-active bridge DC converter during the starting process is effectively prevented, the positive and negative symmetry of the current is ensured, the current-resistant requirement of the switch tubes is reduced, the cost is reduced, a magnetic biasing phenomenon of a transformer is prevented, and the capacity, the volume and the cost of the transformer are reduced.

Washing and cleaning agents containing benzophenone or benzole anilide derivatives containing carboxyl groups, which function as protease inhibitors and are suitable as enzyme stabilizers. Additional subjects are the use of such compounds as reversible inhibitors of a protease and consequently for a washing or cleaning agent formulation, and additional methods and uses relating thereto.