59results about How to "Inhibition imbalance" patented technology

The invention discloses a VIENNA rectifier neutral point potential alternating-direct-current component balance control method which can reduce design capacity of a capacitor on a direct-current side and a filter on an alternating-current side and save cost of a tri-level VIENNA rectifier. On the basis of common mode component injection modulation, a common mode component direct-current compensation coefficient and an alternating-current compensation coefficient are modified dynamically, so that the problem of neutral point unbalance of direct-current and alternating-current components is solved; more importantly, the method guarantees uniformity between triphase alternating-current side harmonic distortion rate and SVPWM while substantially inhibiting neutral point potential low-frequency oscillation in conventional modulation methods and improving quality of output power and can be popularized and applied in the field of battery testing, charging facilities and driving systems.

An image decoding apparatus pertaining to the present invention includes a plurality of decoders. The image decoding apparatus (i) divides image data to decode into a plurality of pieces of partial data, (ii) acquires attribute information pieces each affecting decoding processing time of a corresponding one of the plurality of pieces of partial data, (iii) determines which of the plurality of decoders is caused to decode which of the plurality of pieces of partial data based on the attribute information pieces on the plurality of pieces of partial data and (iv) causes two or more of the plurality of decoders to decode two or more corresponding pieces of the partial data in parallel.

A processing device for performing a geometry process performed as preprocessing for rendering a three-dimensional object on a display by modeling the three-dimensional object using a polygon mesh. The geometry process includes a vertex process that is performed for each of the vertices of the polygon mesh by a different one of a plurality of processors, and processed vertex data obtained by the vertex process is notified among the processors so that a polygon process can be performed in each of the processors. Since each process or can continuously perform the polygon process immediately after the vertex process, it is possible to suppress the occurrence of the unbalance of timing in performing the vertex process and the polygon process, thereby efficiently performing computation while minimizing the wasteful idle time of the processors.

The invention relates to a permanent magnetic motor control device and a permanent magnetic motor control method based on energy optimization. The permanent magnetic motor control device comprises an integrated management and dispatching unit, a pulse width modulation (PWM) rectification unit and an inversion control unit, wherein the PWM rectification unit comprises a controller, and the PWM rectification unit also comprises a power transformation circuit which is of a three-phase four-bridge-arm topological structure and is used for controlling zero-sequence current and compensating input voltage of an electric network so as to eliminate asymmetric current contained in the electric network. Due to the adoption of the permanent magnetic motor control device and the permanent magnetic motor control method, unbalance of the electric network can be effectively inhibited, the power factor is also improved, and the normal running of a rectification circuit is guaranteed; and the inversion unit adopts an energy-optimization-based fuzzy power input (PI) control algorithm to realize the optimum control on energy, so that the energy loss is reduced, and the energy is saved.

An input rectifier of a power supply apparatus rectifies a selected one of two, higher and lower AC voltages applied to it. First and second inverters are connected in the output of the input rectifier. A high-frequency transformer is connected to the output of each of the first and second inverters. An output rectifier is connected to the output of each of the high-frequency transformers. When the higher one of the two AC input voltages is applied to the input rectifier, a switching circuit connects the first and second inverters in series between output terminals of the input rectifier. When the lower AC voltage is applied to the input rectifier, the switching circuit connects the first and second inverters in parallel between the output terminals of the input rectifier. When the first and second inverters are connected in series between the output terminals of the input rectifier, a voltage balancing control unit operates to suppress imbalance between input voltages to the first and second inverters.

Disclosed is a photovoltaic device 1 including a plurality of cluster power generation sections G (G11, G12, G21, and G22). Each cluster power generation section G includes unitary power generation sections D (D1, D2) connected in series via connection points CP12. The cluster power generation sections G each have at least a predetermined one of the connection points CP12 designated as a specific connection point SP12. The specific connection points SP12 are connected together to link the cluster power generation sections G.

The invention relates to a device and a method for cooperatively controlling unbalanced current of a doubly-fed converter. The control method comprises a machine side converter control method and a grid side converter control method, wherein the machine side converter control method comprises the following steps: detecting the negative sequence component of a present stator voltage vector, calculating a rotator negative-sequence current needed for limiting a current unbalance, taking the value of the rotator negative-sequence current as the reference input of a rotator current negative-sequence control to perform the rotator current negative-sequence control; and the grid side converter control method comprises the steps of detecting the negative-sequence component of the present stator current and taking the negative-sequence component of the stator current as the reference input of a grid side current negative-sequence control to perform the grid side current negative-sequence control. The control method has the advantages that the unbalance of the stator current can be effectively inhibited, the loss of a generator set is reduced, the problems of a reactive power pulsation and an active power pulsation are solved; and at the same time, the unbalance degree of a system total-grid current is reduced, so that the power quality and the grid adaption capacity of the generator set are improved.

The invention relates to complex probiotic for treating and preventing allergic diseases as well as a preparation method and a preparation of the complex probiotic. The complex probiotic is characterized by being prepared from strain composition shown in the description in percentage by weight.

The invention discloses a method for optimizing the electric energy mass and energy utilization efficiency of overhead lines. The method is characterized in that an AC-DC-AC device (RPC) with a back-to-back structure is adopted in the overhead lines and is used for connecting different power supply arms, and the RPC supplies electric energy or recovers braking energy when a vehicle is pulled or braked. According to the method, the power needed to be supplied or absorbed by the RPC at each phase change node is calculated through a cooperative optimization algorithm by collecting the traction orbraking power in each phase change arm in the same overhead line, the three-phase imbalance of the overhead lines is inhibited, and the energy utilization rate is improved.

The invention discloses a current compensation type alternating-current voltage stabilizer which relates to an alternating-current voltage stabilizer. The invention aims to solve the problem of poor voltage quality such as dynamic voltage dip, steady-state voltage drop and the like in the traditional power grid. Alternating-current switches, an impedance network and an idle work generation compensation module are respectively arranged on a three-phase power bus between a power grid side and a load side, and three impedance units of the impedance network module are respectively connected with phases A, B and C of a three-phase power bus. Each single-phase alternating-current switch is connected with one impedance unit in parallel; the idle work generation compensation module is connected to the three-phase power bus in parallel; six switching control signal output ends of the control module are connected with six switching control signal input ends of the alternating-current switch; and six idle work generation control signal output ends of the control module are connected with six idle work generation control signal input ends of the idle work generation compensation module. The invention effectively solves problems caused by dynamic voltage dip and steady-state voltage drop in the power grid. The invention can be widely used in occasions with high requirements for voltage quality.

The object of the present invention is to provide a compressor and a refrigeration cycle device with a high reliability anti-reverse rotation device, which can prevent the refrigerant gas from moving to the refrigeration system due to the reverse rotation of the compressor immediately after the compressor stops. The return flow in the cycle will not cause insufficient lubrication of the compression structure due to insufficient refrigeration machine oil. The solution is to equip the first vane and the second vane, the first vane is set in the first cylinder to divide the interior of the first cylinder into a high-pressure chamber and a low-pressure chamber, and the second vane is set in the second In the cylinder, the inside of the second cylinder is divided into a high-pressure chamber and a low-pressure chamber. The first vane is provided with a spring that presses the first rotary piston, and the second vane is not provided with a spring that presses the second rotary piston.

An air-conditioning device for vehicles is provided with an air-conditioning case (21), a center face opening (33), side face openings (33A), and a discharge mode door (50). The discharge mode door has a rotating shaft (52), a door plate (51), and a pair of side plates (53) for connecting the door plate and the rotating shaft and sets a discharge mode in which air-conditioning air is discharged into a vehicle interior. The side plates are arranged within the range of openings of the side face openings in the rotation axis direction. The discharge mode door has suppression protrusions (57) capable of suppressing the flow of the air-conditioning air between the side plates and the air-conditioning case. When a first discharge mode in which the door plate fully opens the center face opening and the side face openings has been set, the suppression protrusions prohibit the suppression of the flow of the air-conditioning air toward the side face openings. When a second discharge mode in which the door plate sets the center face opening and the side face openings to the intermediate degree of opening has been set, the suppression protrusions suppress the flow of the air-conditioning air toward the side face openings.

The invention provides a medium-voltage power distribution network three-phase ground capacitance unbalance suppression system and method. The system comprises a plurality of compensation capacitors and a scheduling master station, wherein the compensation capacitors are divided into bus compensation capacitors and feeder compensation capacitors, each phase of a power distribution network bus is connected with one end of the corresponding bus compensation capacitor, and/or each phase of the power distribution network feeder is connected with one end of the corresponding feeder compensation capacitor, and the other end of the feeder compensation capacitor is grounded; each compensation capacitor is provided with an independent fling-cut switch; and the dispatching master station remotely controls split-phase switching of the three-phase compensation capacitor to realize three-phase ground capacitance unbalance suppression of the medium-voltage power distribution network.

The invention relates to a three-phase unbalance restraining method of a same-tower multi-circuit transmission line. A line impedance matrix is worked out according to the conductor type, the conductor division method, the rod tower type and the connecting method of a lightning conductor; the current and voltage equation of the transmission line is provided according to the conditions of the transmission line, the negative sequence and zero sequence current expressions each time are obtained through matrix transformation and conversion of symmetrical components; negative sequence and zero sequence current sensitive impedance parameters are found according to the obtained negative sequence and zero sequence current expressions; compensation capacitors are configured according to the obtained sensitive impedance parameters, the sensitive impedance parameters are compensated for to the minimum in order to restrain negative sequence and zero sequence current. By compensating for the negative sequence and zero sequence current sensitive impedance parameters, adjustment of line parameters is achieved, the unbalance problem of the same-tower multi-circuit transmission line can be effectively restrained, and theoretic basis and guidance for safe, stable and economical operation of the same-tower multi-circuit transmission line are provided.

The invention discloses a capacitive voltage balancing method for an MMC type direct current transformer with asymmetric bridge arms. The method comprises the following steps: based on a main circuitstructure of the MMC type direct current transformer and a bridge arm current mathematical model, setting up a differential mode current equivalent loop and a common mode current equivalent loop for currents of the bridge arms of the transformer; based on the differential mode current equivalent loop and the common mode current equivalent loop, respectively calculating a first difference value between input power and output power of an upper bridge arm as well as a second difference value between input power and output power of a lower bridge arm; by adopting PI control, acquiring in real time, and based on a difference value between capacitive voltages of the upper bridge arm and the lower bridge arm, adjusting the first difference value and the second difference value, thus capacitive voltage balance is realized. The method disclosed by the invention builds a power transmission model in an equipment operation process, a reason for unbalance of the capacitive voltages of an upper bridge arm module and a lower bridge arm module when an energy transmission direction is asymmetric bridge arm inductance can be accurately obtained, and the first difference value and the second difference value are adjusted by adopting the PI control, so that the method is simple and can effectively inhibit the unbalance, due to the asymmetric bridge arm inductance, of the capacitive voltages of themodules.

The invention discloses a vehicle ACC system attitude control method and system based on an electronic control air suspension. The method comprises the following steps: collecting pitching and pitching movement parameters generated by a vehicle body during the acceleration or braking of a cruising vehicle through an ACC system, obtaining a real-time expected additional pitching moment value of the vehicle through a sliding mode control algorithm, and carrying out the distribution through a force distributor, finally, the expected additional vertical force of the suspension is achieved through inflation and deflation of the electric control air suspension system, then the pitching-resisting moment is synthesized, and vehicle body posture unbalance is restrained. According to the method, simple and feasible principles and strategies can be applied, the feasibility is good, the vehicle body attitude pitch angle change under the cruise working condition can be effectively improved, the vertical and pitch acceleration of the vehicle body is reduced, and the vehicle driving smoothness and the driving comfort are improved.

A drum-type washing machine (51) provided with: a bottomed cylindrical drum (53), which is supported to rotate freely on a horizontal or inclined rotation shaft (35) and has a drum opening (53a) through which laundry (13) is cast; and a water tank (52) for holding the drum (53). The washing machine is also provided with: a driving unit (54) for rotating the drum (53); and a first balancer (30), which is provided near the drum edge at the drum opening (53a) end and in which first weights (58) are housed inside a first tube-shaped container in which a first hollow tube is formed in a circular shape. The washing machine is also provided with: a second balancer (31), which is provided near the drum edge at the end opposite to the drum opening (53a) end and in which a second weight (32) is housed inside a second tube-shaped container in which a second hollow tube is formed in a circular shape; and a control unit (56) for controlling the driving unit (54).

The invention provides a three-level APF direct-current voltage balance control method capable of compensating even harmonics, and particularly relates to direct-current voltage balance control underthe working condition of compensating even harmonics. Conventional three-level equipment does not need to process even harmonics, but for a three-level active filter, multiple harmonics need to be compensated at the same time, and when a conventional algorithm compensates the even harmonics, direct-current voltage balance control cannot be effectively controlled. According to the method for compensating the output voltage of the active filter by using an integral value of the zero-sequence voltage during even harmonic compensation, the problem of DC voltage imbalance caused by even harmonic compensation can be effectively solved.

The invention discloses an indanone quinoxaline derivative as well as a preparation method and application thereof. The indanone quinoxaline derivative disclosed by the invention takes an indanone quinoxaline group as an electron acceptor and an aromatic amine group as an electron donor, and the organic small molecule has the advantages of single structure, simplicity in purification and stable yield; and the organic small molecule derivative has a thermally activated delayed fluorescence property, can form an organic thin film through vacuum evaporation or spin coating, and is applied to organic photoelectric devices including organic light emitting diodes and the like. The indanone quinoxaline derivative has important significance for developing novel organic photoelectric materials with low cost and good performance.