200 results about "Internal loop" patented technology

A dual processor framer includes a receiver and a transmitter which share common circuitry and/or code. Separate direct memory access controllers may be used for each of the receiver and transmitter. Processing is distributed over two or more processors. One processor may be a lower power processor while another processor may be a higher power processor. At least one of the two or more processors may be programmable or reconfigurable. The transceiver is configured to provide internal loop back self testing at various points in the processing. Timing within the transceiver may be established almost entirely by a single clock domain.

The invention relates to a virtual synchronous generator control method based on self-adapting moment inertia. The output of a grid-connected inverter in distributed generation is connected with an AC bus of a filter capacitor Cf which is in parallel connection with the grid-connected inverter through a filter inductor Lf; sampling is performed to obtain the output power, the voltage and the current of an output interface of an inverter; the output power, the voltage and the current are transmitted to a VSG (virtual synchronous generator) algorithm; the calculated terminal voltage of a VSG stator is sent to be controlled by a voltage external loop; the voltage external loop adopts a PI controller to stably load the voltage; the current of the filter capacitor is sent to be controlled by a voltage internal loop; the voltage internal loop adopts a PI controller to increase the response speed; a control signal is outputted by a voltage-current dual-closed loop to the grid-connected inverter; the moment inertia in the virtual synchronous generator in the control method can be changed in a self-adapted manner according to the change capacity of the system frequency. Through the adoption of the virtual synchronous generator control method disclosed by the invention, the transient state process of the system is reduced; a great deal of harmonic waves in the system is offset; the stability of frequency and the stability of voltage can be improved; the adaptability and the power supply quality of a micro-electrical network are improved; the problem that in a conventional method, the output frequency is reduced, is solved.

The present invention discloses an Up-flow Multi-stage Anaerobic Reactor (UMAR) used for treatment of medium/high concentration organic wastewater. The stated UMAR with forced internal circulation, improved phase separator and added sludge inlet overcomes the disadvantages of a lower load, a longer hydraulic retention time and a larger dimension in traditional anaerobic reactors. The forced internal circulation increases capacity and cycles of internal circulation thus increased efficiency of contaminant removal. The fast jetting is avoided and efficiency of gas/liquid separation is increased by an improved bending outlet of up flow pipe. The simplified sludge addition and usage are obtained by a sludge inlet. The load of UMAR in this invention can reach about 30 kgCOD/(m³d) for treatment of medium/high concentration of organic wastewater from pulp and paper process and similar wastewater, being about four times of load and capacity of traditional Up-flow Anaerobic Sludge Bed (UASB) reactors.

A circuit for a voltage controlled oscillator has a bridge structure including two cross-coupled N-type transistors and two cross-coupled P-type transistors. A current mirror is coupled to the two N-type cross-coupled transistors and configured to generate a bias current. An LC resonator is coupled in parallel between the two cross-coupled N-type transistors and the two P-type cross-coupled transistors. The LC resonator includes two pairs of differential inductors mutually coupled by a mutual inductance coefficient, each pair comprising a first inductor arranged on a respective branch of an external loop, and a second inductor arranged on a respective branch of an internal loop. A first varactor is coupled to a common node and a first branch of the internal loop. A second varactor is coupled to the common node and the second branch of the internal loop.

The invention discloses a heavy oil hydroprocessing method and an internal loop reactor used by the method. In the heavy oil hydroprocessing method of the invention, the internal loop reactor is internally divided into two reaction segments, namely a fluidized bed reaction segment in a sleeve and a fixed bed reaction segment of a loop gap, and the mixture of heavy oil and hydrogen gas enters the reactor from the bottom and passes through the fluidized bed reaction segment first to undergo hydrogenation in the presence of a fluidized bed catalyst; and the catalyst is separated from the mixtureafter the reaction by a separator arranged on the upper part of the sleeve, and gas and liquid continuously go downwards to enter the fixed bed reaction segment of the loop gap to further undergo thehydrogenation in the presence of a fixed bed catalyst. The method has the combined characteristics of the fluidized bed and fixed bed hydrogenation processes, is well adapted to inferior raw materialoil with high metal and high asphaltene content and can realize the long-period stable operation of the device under the condition of achieving a high conversion rate and a high impurity removal rate.

The invention discloses a four-rotor aircraft attitude and position hybrid control method based on DIC-PID. The method comprises the steps that 1 a four-rotor aircraft is used as a single rigid body, and the nonlinear dynamics model is acquired through a Newton-Euler equation to determine in-out relation of a system; 2 attitude control is carried out on the internal loop of the four-rotor aircraft based on a DIC dynamic inverse control theory to form an inner ring attitude controller; 3 position control is carried out on the external loop of the four-rotor aircraft based on a PID theory to form an outer ring position controller, and decoupling control of attitude and position channels is realized; and 4 in a simulation environment, the proposed control method is tested through step response and a tracking rising spiral line. The hybrid control method provided by the invention has better ability to suppress external disturbance and unmodeled dynamics, and can meet the requirements of attitude control and position control of the four-rotor aircraft.

The present invention discloses a multichannel attitude controller of an aircraft. The controller comprises an execution mechanism and an inertia platform, and also comprises a calculating unit used for calculating the current angular velocities and the current air-flow angles of the three channels of rolling, yaw and pitching of the aircraft according to the measurement information of the inertia platform, and then feeding back and outputting. An external loop control unit is used to calculate the angular velocity adjustment values of the three channels according to the current air-flow angles and the received air-flow angle control values of the three channels. For the yaw (pitching) channel, the angular velocity adjustment value is added with a yaw (pitching) angular velocity caused by a parallel branch to obtain an angular velocity control value, and the angular velocity adjustment value of the rolling channel is used as the angular velocity control value of the rolling channel. An internal loop control unit is used to generate a control plane deflection instruction to output to the execution mechanism according to the current angular velocities and the current angular velocity control values of the three channels. The multichannel attitude controller of the aircraft of the present invention obtain a stronger channel decoupling effect by compensating the angular velocity control values of the three channels.

The invention discloses a GPS-guided unmanned aerial vehicle automatic carrier-landing adaptive control system and method. The system includes: a GPS guidance reference trajectory generation and trajectory error calculation module which is used for inputting signals detected by a GPS, establishing a reference trajectory in a ground coordinate system with an ideal carrier-landing point being an original point, and finally outputting the signals; a longitudinal guidance law module which uses a pitch attitude as an internal loop, and realizes control of flight height by suppression of a height error; a lateral guidance law module used for subtracting an actual lateral position signal from a designated lateral position signal to obtain an error signal and eliminating the error signal; and a flight control loop includes control law modules of four channels of accelerator, elevator, aileron and rudder. The GPS-guided unmanned aerial vehicle automatic carrier-landing adaptive control system provided by the invention realizes conversion of a trajectory tracking error signal into an attitude tracking command signal, solves the problem of attitude tracking through adaptive control, and an unmanned aerial vehicle automatic carrier-landing guidance and control system is formed.

The invention relates to a cycle fluid bed boiler load serial burning control system, which comprises a forecasting unit, a main steam pressure serial control circuit, a coal feeder average rotation speed PID circuit, a one-time wind PID circuit, a secondary wind PID circuit. Wherein, the forecasting unit uses secondary curve as forecast function to forecast the main steam pressure; the main steam pressure serial control circuit comprises an external loop PID circuit and an internal loop PID circuit, to guide the bed temperature signal or/and hearth outlet temperature into internal loop PID circuit as the middle controlled variable; the result of main steam pressure serial control circuit is used as the control order of boiler to be input into the coal feeder average rotation speed PID circuit, the one-time wind PID circuit and the secondary wind PID circuit. The invention also discloses a method for controlling said cycle fluid bed boiler load serial burning control system. The invention can solve the defects of present technique that large over-adjusted main pressure and worse bed temperature stability.

The invention discloses a rotor-position sensor doubly salient motor system and a control method thereof, belonging to the field of doubly salient motor systems and the control method thereof. The system consists of a doubly salient motor, an excitation winding, a main power circuit and a control circuit, wherein, the main power circuit comprises a power supply and an IPM; and the control circuit comprises an isolation circuit, a failure detection circuit, a three-phase current sampling circuit, an excitation current sampling circuit, a PWM control circuit, an over-current and over-voltage protection circuit, an ADC module, a position detecting circuit, a rotation speed calculation circuit, a logic control circuit, a capture unit, a speed loop, a current loop, a hysteresis comparator and a PI regulator. The control method indirectly controls the current of the doubly salient motor by adopting a dual-loop control type of internal loop for current and external loop for rotation speed and comparing the given rotation speed for reference with the fed practical rotation speed. The method has simple system, firmer structure, reliable operation and high efficiency.

The invention discloses the laser testing method of the roller bearing vibration displacement. Equip the bearing on the spin axis of the test bed; makes use of the reflection of the laser through the bearing surface to arrive the PSD sensor surface; the PSD position sensor gives the facula position. The internal loop and the main axis of the bearing can be viewed as the rigid body because the radial force carried by the external loop of the bearing. When the spin axis spins, the inner and the external loops and the roller bring about the vibration and reflect the displacement s of certain point of the bearing surface by the PSD sensor. The invention has simple structure, clear principle and high precision.

The present invention discloses self-loop optical receiving/transmitting module, a test device and a method. Wherein, the module comprises an electrical interface for the optical receiving/ transmitting module in compliance with requirements for multi-source stipulations on small-sized packaging and hot plug. A differential signal input terminal of the electrical interface is correspondingly connected with a differential signal output terminal of the electrical interface through a series capacitance. A resistance is connected between two differential signal output terminals of the electrical interface. The self-loop optical receiving/transmitting module disclosed by the present invention can replace an actual XFP optical module of normal functions, realizes internal loop of communications in the optical module and is mounted in an optical interface board of equipment and suitable for extensive application to equipment test and aging, thus reducing optical module aging to some extent and avoiding reduced service life and increased failure rate of the optical module due to aging.

A process and apparatus for industrial-scale preparation of an emulsified fuel including a water phase in a continuous organic phase which contains less than 20% by volume of water, and at least one additive necessary for forming the emulsified fuel. The fuel is formed by mixing and homogenizing the organic phase and the additives, forming a volume V, inside an homogenization tank with internal circulation rate Qc, such that Qc/V>=100 h-1, circulating the homogenized fluid in a branch loop emerging from the tank at a rate Qcirc, and through at least one emulsifying system located on said loop, at a rate such that 0 h<V/Qcirc<=2 h, feeding the aqueous phase into the branch loop upstream of the emulsifying system, and maintaining the homogenization in the tank and the circulation of the liquid in the branch loop until the emulsion acquires a desired characteristic of storage stability.

The invention discloses a power damping synchronization control method suitable for a VSC-HVDC connection extremely-weak AC power grid. The power damping synchronization control method is characterized in that: a phase locked loop (PLL) is preserved, an output phase angle theta of the phase locked loop only serves as an input reference phase angle of system DQ transformation; an external loop voltage controller controlled by a conventional current vector is kept unchanged on the basis of step 1, the external loop voltage controller outputs idref and iqref which serve as reference values of an internal loop current controller, and the capacity of restricting overcurrent of a VSC current converter is preserved; and an internal loop id current controller is redesigned, a power synchronization loop (PSL) and a power damping loop (PDL) are embedded in the internal loop id current controller so as to generate a phase angle signal delta required by output voltage of the VSC current converter, and an internal loop iq current controller generates an amplitude signal Em of the output voltage of the VSC current converter through adjusting iq component. By introducing the PSL and the PDL into the internal loop, contradiction between power synchronization control (PSC) and PLL is effectively coordinated, the negative influence of the PLL on VSC-HVDC system stability in a weak system is inhibited, and the system control performance of the VSC-HVDC under the working condition of being connected with the receiving-end extremely-weak AC power grid.

Disclosed herein is a ΔΣ modulator including: at least one integrator; a quantizer for quantizing a signal output by the integrator and outputting the quantized signal as a digital signal; and a compensation section configured to compensate the ΔΣ modulator for a non-ideal characteristic caused by an internal loop delay, wherein the compensation section is a feedback path formed to start at the output node of the quantizer and end at the input node of the integrator immediately preceding the quantizer, and the feedback path formed to start at the output node of the quantizer and end at the input node of the integrator realizes a frequency-independent part in combination with the integrator and an internal DA converter which adopts the NRZ technique to suppress the signal amplitude at the quantizer input.

The invention relates to a power machinery closed loop face-to-face double gear case inclination type excitation test stand. The power machinery closed loop face-to-face double gear case inclination type excitation test stand comprises a transverse gear case excitation device, a power machinery closed loop face-to-face double gear case inclination type test stand, a portal frame vertical excitation device, a vibration isolation T-shaped groove cast iron base platform, a vibration isolation concrete base and a vibration isolation spring group system arranged at a lower end of the vibration isolation concrete base. Through cycle use of the power in a closed loop system, energy consumption is reduced, tests can be maintained through utilizing a motor with small power to compensate a part of the power, so the energy saving purpose is realized; the test stand is an inclination type test stand, so the gear cases are enabled to generate certain inclination angles transversely and vertically, lubrication oil distribution and the lubrication situation of the gear cases can be simulated and detected when a high speed train is under conditions of curvilinear motion, braking and acceleration, through the test stand, safety operation of a high speed train group is improved, travelling comfortableness of a high speed motor train unit is improved, and development of the motor train unit technology is greatly facilitated.

The invention relates to an off-grid control method of a micro-grid energy storage device based on power prediction and adopts a double-loop control strategy. The control of the storage battery adopts voltage to control an external loop and adopts current to control the internal loop; the control of a super capacitor adopts power to control the external loop and adopts the current to control the internal loop. Photovoltaic output power PV and load power PL of different times in a day are determined according to a power prediction curve; a difference value signal P delta of the output power PV and the load power PL is calculated; a DB9 wavelet packet decomposition method is adopted to perform decomposition on the difference value signal P delta to obtain a high frequency part signals Phigh and low frequency part signals Plow; the low frequency part signals Plow is complimented by the output power of the storage battery; and the high frequency part signals Phigh is complimented by the super capacitor output power.

The self-circulation series air-lift inner ring current reactor system comprises two air-lift inner ring current reactors, wherein, every reactor comprises: tower body 1, draft tube 2 with liquid inlet 5, gas distributor 3, over-flow device 6 with liquid outlet 4 on bottom, and pipe 8 used to connect one outlet to inlet on another reactor; the liquid out from over-flow device contains no gas while the liquid in reactor contains some gas; in inlet 5, the liquid pressure in pipe is larger than the reactor, liquid flows into to realize material exchange and recycle without pump; the dissolve speed of gas in said reactor is quick, the adsorption and three-phase catalysis reaction have high efficiency.

The invention relates to the field of distributed power generation, and aims at providing an impedance adaptive power decoupling control method considering the virtual synchronous machine power angleinfluence. The method comprises the steps that the fluctuating quantity Deltadelta of the power angle is estimated by using the output active power of a virtual synchronous machine, and then the virtual resistance value Rv and the virtual inductance value Xv of virtual impedance are calculated; and then the virtual impedance values Rv and Lv are added to an inverter voltage control loop, the obtained voltage given value EO* acts as the given signal of the internal loop voltage control loop, finally the output signal of internal loop control acts as the control signal of the inverter, and the internal loop is double closed loop control of voltage and current. The problem of power coupling caused by increasing of the power angle is considered, and the size of the virtual impedance value is autonomously changed when the output power angle fluctuates so as to realize power decoupling of the virtual synchronous machine. The influence of the power angle, i.e. the active power loop, on the reactive power control loop can be relieved, and the method has the stable, accurate and excellent control effect.

The invention provides an annular radial-flow negative-pressure suction internal loop photoelectric catalytic reactor, comprising a photoelectric catalysis oxidation reaction system and an annular radial-flow negative-pressure suction internal loop water inlet system, wherein the photoelectric catalysis oxidation reaction system comprises a plate-type tubular DSA anode and a mesh-type tubular titanium cathode; a granular photoelectric catalyst is filled between the anode and the cathode; an ultraviolet generator is arranged in the mesh-type tubular titanium cathode; the annular radial-flow negative-pressure suction internal loop water inlet system is arranged at the lower part of the photoelectric catalysis oxidation reaction system; a liquid injection pipe is arranged at the center of the water inlet system; a plurality of pipelines with adjustable lengths are arranged at a bottleneck of the liquid injection pipe; the liquid injection pipe is communicated with an annular radial-flow water feeder which is densely distributed with constant-diameter round holes in a bottom region of the reactor; a gas injection pipe is arranged at the top of the reactor; an air inlet of the gas injection pipe is connected with a compressed air pump; an air outlet is connected with the atmosphere; the bottleneck is connected with an exhaust pipe at the top of the reactor; and hydrogen generated in the reactor is diluted and discharged.

The invention provides a power distribution cabinet with internal cyclic heat dissipation. The power distribution cabinet comprises four semicircular-ring fixed frames, eight double-outlet-rod cylinders and the like, and is characterized in that the four semicircular-ring fixed frames are classified into two groups, each of which consisting of two semicircular-ring fixed frames, and the two groups are arrayed on upper and lower layers; the two groups of the semicircular-ring fixed frames on the upper and lower layers are connected together through four first electric cylinders; the rear end parts of the two semicircular-ring fixed frames in each group are hinged together; mounting holes for mounting bolts are formed in the front end parts of the semicircular-ring fixed frames; the two semicircular-ring fixed frames on the identical sides of the upper and lower layers are connected through two of the first electric cylinders; a damaged part of a power pole is repaired by adopting an external cement injection method, so that the service life of the power pole is prolonged.

Embodiments are directed to obtaining a first analog signal corresponding to a position error between a commanded gang output of a plurality of electro-mechanical actuators configured to be run in parallel with one another and a measured gang output of the plurality of electro-mechanical actuators, obtaining a second analog signal corresponding to an output torque, and processing, by a circuit, the first analog signal and the second analog signal to generate and output a discrete that indicates a status of the torque in terms of direction and magnitude.

The invention discloses a business data transmission method and a business data transmission device. The method comprises the following steps of: by using a designated port for internal loop back in an exchange chip, receiving business data redirected onto the designated port, wherein the data quantity of the business data redirected onto the designated port does not exceed the rated data quantity corresponding to bandwidth for internal loop back in the designated port; carrying out internal loop back on the business data in the designated port; and transmitting the business data subjected to the internal loop back to L2VPN through the designated port. With the adoption of the method and the device, the technical problem in the prior art that as data is discarded at an input port of the exchange chip, a system enters slow start to cause low data transmission efficiency is solved, so that the technical effects of improving the data transmission efficiency and improving the bandwidth utilization are achieved.

The invention discloses a burner and a gas stove having the same. The burner comprises a stove end and a plurality of burner bodies arranged on the stove head, wherein the plurality of burner bodies consists of an internal loop fire burner body, a middle loop fire burner body and an external loop fire burner body; each burner body is formed by a mixing cavity and a cover plate covering the mixing cavity; the middle loop burner body is an atmosphere burner; the burner further comprises a gas dividing disc; the gas dividing disc is arranged between the plurality of cover plates and the stove head and detachably connected with the stove head; the stove head and the gas dividing disc are separated, so a secondary air channel supplying air to the middle loop fire burner is formed between the gas dividing disc and the stove head; and the secondary air channel is communicated with external environment. The secondary air channel of the burner can be conveniently cleaned.

The invention relates to a power coordination control method of a direct-current micro-grid group. A direct-current micro-grid power autonomous control system and an isolation bidirectional DC-DC (Direct Current-Direct Current) common power control system are used; each direct-current micro-grid is provided with an independent power autonomous control system; a power unit adopts a constant-power control model; a balance unit is composed of secondary control, namely direct-current voltage recovery, direct-current voltage droop control and voltage/current double-closed-loop control. The isolation bidirectional DC-DC common power control system comprises two parts: external loop control is interconnected power autonomous control and communication with two interconnected direct-current micro-grid secondary control systems is carried out to obtain droop control characteristic parameters; then direct-current bus voltage at two sides are actually measured and an interconnected power error signal can be obtained through calculation; then a power reference value of an internal loop control system is obtained through a PI (Proportion Integration) controller, and internal loop control is power closed-loop control.