67results about How to "Stable operating point" patented technology

The invention belongs to the field of application of photovoltaic power generating system control technology, and relates to a maximum power tracking control method for a monopole three-phase photovoltaic grid-connected system. The method comprises the following steps of: firstly, by testing voltage and current outputted by a photovoltaic array, working out a differential coefficient k of the output power to the voltage of the photovoltaic array and a change rate delta k of the k; secondly, according to the k and an output Step1 of a fuzzy controller (an input is k and delta k, and the output is Step1), jointly determining the disturbance step length and direction of a disturbance voltage delta U which is superposed on a reference voltage U ref of a maximum power point of the photovoltaic array, and making the U ref quickly iterative and then converged at the optimal reference voltage corresponding to the maximum power point of the photovoltaic array under the current environment; and finally, realizing the quick and accurate tracking of the output voltage of the photovoltaic array on the U ref by a double closed loop control system consisting of a voltage PI controller and a synchronous vector current PI controller with feedforward compensation.

The invention discloses a control system of low-power fuel battery automobile. The control system comprises a low-power fuel battery engine, a DC / DC converter, a fuel battery manager, a power battery, a power battery manager, a mode selection switch, an inverter and a whole vehicle controller. The whole vehicle controller determines that the low-power fuel battery engine works at economic power, high-level power, rated power or peak power according to a state of the mode selection switch and a charge value of the power battery, and controls the fuel battery manager according to a working mode of the low-power fuel battery engine; when the charge value of the power battery falls within a preset range, the whole vehicle controller controls the fuel battery manager to start the low-power fuel battery engine to output continuously stable power and controls the power battery to provide instant power. The control system can optimize energy distribution of a whole vehicle to enable the working point of a fuel battery system to be stable, so that the service life of the fuel battery system is prolonged.

The invention discloses a device and a method for performing offset point automatic locking on an electrooptical modulator with ultrahigh extinction ratio. The offset point automatic locking device of the electrooptical modulator with ultrahigh extinction ratio comprises a laser, an electrooptical modulator, an optical switch, an electrooptical modulator offset voltage control system and a clock synchronization module, wherein the electrooptical modulator offset voltage control system comprises an electrooptical conversion signal amplification module, an analog-digital conversion module, a controller and an output driving circuit; and the clock synchronization module is used for opening an synchronization optical switch, inputting modulated electrical impulse of the electrooptical modulator radio-frequency end, and the disturbance leading-in time of the direct-current offset end of the electrooptical modulator. The method is characterized in that ultrahigh extinction ratio pulsed light output is realized through the cascade connection of the electrooptical modulator and the optical switch, and through controlling the offset voltage of the electrooptical modulator, the electrooptical modulator operates at an appropriate working spot stably. According to the invention, the offset voltage of the electrooptical modulator is controlled automatically; the pulsed light extinction ratio output by the device is improved greatly; and the energy is higher and much stable.

The invention relates to a method for controlling a generator of electric energy that is connected to an electrical supply grid on a grid connection point, comprising the following steps: feeding electrical power into the electrical supply grid, whereby the generator is operated in a first operating point, interrupting the feeding so that no power is fed into the supply grid if a fault in the electrical supply grid or a fault of the feeding into the electrical supply grid exists or is displayed, resuming the feeding so that electrical power is again fed into the supply grid, whereby the generator resumes the feeding in a second operating point or is gradually increased in said second operating point, and the second operating point is designed in such a way that it feeds into the supply grid with a higher stability reserve than the first operating point.

The invention discloses a temperature compensation circuit for a radio frequency power amplifier. The temperature compensation circuit comprises a temperature control circuit and a negative feedback circuit, wherein the temperature control circuit is used for generating a first electric signal corresponding to a temperature and regulating a second electric signal of a first node according to the first electric signal; and the negative feedback circuit is used for providing a negative feedback signal to the radio frequency power amplifier by a second node on the basis of the second electric signal, wherein the second electric signal is used for changing a resistance value of the negative feedback circuit so as to regulate the negative feedback signal related to the resistance value; and the negative feedback signal is used for being input into the radio frequency power amplifier to change a gain of the radio frequency power amplifier. Meanwhile, the invention further discloses the radio frequency power amplifier.

The built-in double-V-shaped series-parallel hybrid magnetic circuit adjustable magnetic flux permanent magnet synchronous motor belongs to the field of permanent magnet motors and solves the complexstructure and the high cost of a conventional device for generating radial polarized light and angular polarized light. A plurality of permanent magnets are built in a rotor core air gap side body toform P pairs of magnetic poles. Each magnetic pole comprises two low-coercive-force permanent magnets and two high-coercive-force permanent magnets. The two low-coercive-force permanent magnets are arranged symmetric about the rotor straight axis of the magnetic pole to form a V shape. An inner V-tip magnetic isolation groove is connected with the two low-coercive-force permanent magnets simultaneously. The two high-coercive-force permanent magnets are arranged symmetric about the rotor straight axis of the magnetic pole to form a V shape and are located outside the two low-coercive-force permanent magnets. The low-coercive-force permanent magnet and the high-coercive-force permanent magnets on the same side of the rotor straight axis are arranged in parallel. The V-shaped tips of the twohigh-coercive-force permanent magnets do not communicate with each other.

The invention relates to a protocol interface device based on the mobile industry processor interface (MIPI). The device comprises a data receiving and sending module and a channel control and interface logic module used for processing the received or sent data. Especially, the data receiving and sending module comprises at least one submodule of a high speed receiving submodule, a high speed sending submodule, a low-power receiving submodule and a low-power sending submodule which are electrically connected with a differential port used for receiving / sending data, wherein the high speed receiving submodule is used to amplifying and shaping the differential signals with low power and low swing amplitude which is input to the interface device to rail to rail signals of which swing amplitude of output voltage is near or equal to the supply voltage. The low-power sending submodule is used to perform control input to the waveform of signals of the interface device, thus the time of rising edge from 15% to 85% of the total peak area in the signal waveform and the time of failing edge from 15% to 85% of trough in the signal waveform are not more than 25ns. The invention provides the realization scheme of the high speed receiving submodule and low-power sending submodule which are applicable to industrial application.

The invention discloses a plug-in type planet series-parallel automobile energy management control method and belongs to the technical field of hybrid automobile control. The plug-in type planet series-parallel automobile energy management control method is used for determining a working point of each power source of a vehicle control electric mode and a hybrid drive mode. In the hybrid drive mode, the change of a driver desired torque is responded by controlling a motor desired torque in different battery capacity modes; a working point of an engine is always controlled on an optical workingcurve; when an actual torque of a motor is larger, an engine desired torque is controlled to be increased, so that the motor obtains a torque interval supplementing the driver desired torque; in addition, the control of the working point of the engine also needs to guarantee a control output power of the battery. The plug-in type planet series-parallel automobile energy management control method disclosed by the invention has the advantages that the stable operation of the engine is sufficiently considered, the fuel consumption is reduced, the battery output power control is reduced, and the fuel economy in the full running process is improved; and as the method is a control strategy of a logic threshold value, the operation speed of the method in a controller is high, and the method is easy to implement and popularize.

The invention provides a band-gap reference source circuit comprising three mirror image current branches, three resistors, two PNP transistors and an operational amplifier. The emitting electrode area of the second PNP transistor is N times that of the first PNP transistor. The first PNP transistor is not connected with the resistors in parallel. Standard transistors are connected in series between the three mirror image current branches and a power supply voltage. The threshold electricity of the standard transistors is approximate to zero volt, so that the three mirror image current branches can be turned up when the power supply voltage is power on and degeneracy points of zero current of the whole circuit can be eliminated; the single-side bypass resistors are adopted and the first PNP transistor is not connected with the resistors in parallel, so that the first PNP transistor is directly turned on when the corresponding mirror image current branch is turned on and degeneracy points of zero current of audions can be eliminated. The circuit only has one stable working point, does not require additional start circuits, and is in simple in structure.

A method and device for diagnosing a crankcase ventilation of an internal combustion engine, which enable a diagnosis of a malfunction of an actuator of the crankcase ventilation. The internal combustion engine has at least two cylinder banks to which the crankcase ventilation is supplied, and an actuator is provided via whose position the distribution of the crankcase ventilation to the at least two cylinder banks is influenced. In a first position of the actuator, a different distribution of the crankcase ventilation to the at least two cylinder banks comes about than in a second position of the actuator that differs therefrom. Given simultaneously activated operation of the at least two cylinder banks, the actuator is switched over at least one between the two different positions. For at least one of the at least two cylinder banks, a characteristic variable of the internal combustion engine influenced by the crankcase ventilation is determined prior to and following the switchover operation. A minimum value for a change in the characteristic variable of at least one of the at least two cylinder banks and / or the ratio of the characteristic variable between the at least two cylinder banks is specified for the switchover-related change in the distribution of the crankcase ventilation to the at least two cylinder banks. A malfunction of the actuator is detected if at least one change derived from the ascertained values for the characteristic variable undershoots its assigned expected minimum value in quantitative terms.

A laser beam generator which improves the stability against vibration and change with time and reduces influence of temperature change on a resonator. The laser beam generator (1) includes a pumping light source (2) for generating pumping light of a continuous wave and a solid laser resonator (4) utilizing thermal lens effect caused by produced heat at the pumping position. The solid laser resonator comprises a laser medium (4a), a saturable absorber (4b), an intermediate medium (4c), and a reflecting means (4d). Combining the substrate of the laser medium (4a) and that of the saturable absorber (4b) into one unit leads to reduction in vibration influence. A structure substantially immune to thermal influence of temperature change without the need for a method for selecting the operating point by using temperature change is used. With respect to the positional relation between the pumping optical system and the resonator, they are moved relatively to adjust the optical path length of the resonator, and thereby a stable operating point can be selected.

The invention relates to a hybrid vehicle driving mechanism based on a planetary gear train, consisting of a planetary gear train; a sun wheel of the planetary gear train is provided with a central axis which is connected with an output shaft of a power source, a planet frame of the planetary gear train is a power output shaft of the driving mechanism, a gear ring of the planetary gear train is provided with a gear pair connected with a preposing intermediate shaft, the power output shaft is provided with a gear pair connected with a post-positioned intermediate shaft, and a motor shaft is provided with transmission shafts respectively connected with the preposing intermediate shaft and the post-positioned intermediate shaft; electronic control clutches are arranged between the transmission shafts and the preposing intermediate shaft as well as the post-positioned intermediate shaft, and a shaft brake is positioned on the preposing intermediate shaft. The driving mechanism leads the power source to be coupled with the power of a motor by the planetary gear train, and can cause the direct corresponding relations between the operating points of an engine and whole vehicle speed to be separated from each other, thus conveniently realizing optimal control for the working efficiency of the engine. Compared with the existing hybrid vehicle driving mechanism applying the planetary gear train, the invention has the remarkable advantages simpler structure.

The invention discloses a multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm. The modulation waveform of the fiber-optic gyroscope is reasonably designed, a plurality of phases are obtained through division in a modulation and demodulation period, different modulation amplitudes are realized on different phases and gyroscope output signals in the time periodare sampled, demodulation of parameters such as angular rate, half-wave voltage parameters, signal intensity and the like is realized by combining different closed-loop processing methods and the multi-parameter multi-closed-loop is realized. According to the fiber-optic gyroscope multi-closed-loop algorithm, the linearity, the bias stability and the like of the fiber-optic gyroscope are improved,existing hardware does not need to be added or changed, the working state of the fiber-optic gyroscope is monitored in real time through the modulation and demodulation method and the reliability isimproved.

The built-in line-shaped / U-shaped series-parallel hybrid magnetic circuit adjustable magnetic flux permanent magnet synchronous motor belongs to the field of permanent magnet motors and solves the problems in the magnetic modulating process of the existing permanent magnet motor. A plurality of permanent magnets are built in the air gap side body of a rotor core 3 to constitute P pairs of magneticpoles. Each magnetic pole comprises a low-coercive-force permanent magnet 5 and three high-coercive-force permanent magnets 7. The three high-coercive-force permanent magnets 7 are arranged symmetricabout the rotor straight axis of the magnetic pole to form a U-shaped structure and opening of the U-shaped structure faces a radial air gap. The low-coercive-force permanent magnet 5 is disposed atthe opening of the U-shaped structure. The low-coercive-force permanent magnet 5 is arranged tangentially with the rotor straight axis of the magnetic pole as a symmetrical line to form a line-shapedstructure. First magnetic isolation grooves 6 are disposed at both ends of the low-coercive-force permanent magnet 5. Both end portions of the opening of the U-shaped structure are provided with a third magnetic isolation groove 10. The two bottom corners of the U-shaped structure are each provided with a second magnetic isolation groove 9.

The invention provides a sensor circuit which comprises a sensor, a preprocessing circuit and an impedance biasing circuit, wherein the sensor is connected to the preprocessing circuit through an input connection wire. The impedance biasing circuit is connected between the input connection wire and a bias point and comprises a first impedance switching circuit and a second impedance switching circuit. The first impedance switching circuit comprises a first transistor and a second transistor. The first transistor and the second transistor are connected to form a first current mirror. The second impedance switching circuit comprises a third transistor and a fourth transistor. The third transistor and the fourth transistor are connected to form a second current mirror. The second current mirror is connected to the first current mirror in a reverse matching current mirror mode and receives bias voltage supplied by the bias point. The first transistor, the second transistor, the third transistor and the fourth transistor work in a sub-threshold region under the action of the bias voltage.

The invention provides a built-in V-type-U-type serial-parallel hybrid magnetic circuit adjustable magnetic flux permanent magnet synchronous motor, and belongs to the field of permanent magnet motors. The problems existing in a magnetic adjustment process of the existing permanent magnet motor are solved. The scheme of the invention is as follows: a plurality of permanent magnets are built in anair gap side of a rotor core to form P pairs of magnetic poles, each magnetic pole comprises two low-coercivity permanent magnets and three high-coercivity permanent magnets, the three high-coercivitypermanent magnets are symmetrically disposed as a U-shaped structure with a straight shaft of a rotor of the magnetic pole as a symmetrical line, and an opening faces to a radial air gap; the two low-coercivity permanent magnets are symmetrically disposed as a V-shaped structure with the straight shaft of the rotor of the magnetic pole as the symmetrical line, and the opening faces to the radialair gap; the V-shaped structure is disposed in the U-shaped structure; and a V-shaped end part magnetic isolation groove is respectively formed in two end parts of the V-shaped structure, a V-shaped top end magnetic isolation groove is formed in a top end part of the V-shaped structure, a U-shaped end part magnetic isolation groove is respectively formed in the two end parts of the opening of theU-shaped structure, and a U-shaped base angle magnetic isolation groove is respectively formed in the two base angles of the U-shaped structure.

The invention relates to a pilot-adaptive Mach-Zehnder modulator laser pulse adjustment module. The pilot-adaptive Mach-Zehnder modulator laser pulse adjustment module comprises a laser, a Mach-Zehnder modulator, an optical coupler, a DSP bias voltage control module, and a pulse output module, wherein the DSP bias voltage control module produces a pilot signal for the Mach-Zehnder modulator and then feeds back an output light signal to the DSP bias voltage control module for FFT, so as to obtain amplitude components and phase relations of corresponding first harmonic and secondary harmonic, aharmonic amplitude ratio is used as an error signal, so as to make a working point of the Mach-Zehnder modulator stabilize at a NULL point through digital PID; a pulse signal is loaded for pulse adjustment; pulses at different frequencies have different interference on pilot, as a result, the NULL point cannot be stabilized, the DSP bias voltage control module adjusts frequency of the pilot adaptively till the NULL point is stabilized again. Due to introduction of the pilot adaptive adjustment technology, output of high extinction ratio of laser pulse of any frequency is realized.

The invention discloses a current rotating circuit applied to a Hall sensor. According to the circuit, interference of a turn-on resistance and a parasitic capacitance of an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switching tube in the current rotating circuit on the circuit can be eliminated and an output common-mode voltage of the circuit is stabilized. The circuit has a simple structure and high reliability and can be widely applied to the Hall sensor to carry out current rotation of a Hall signal so as to eliminate detuning. The current rotating circuit disclosed by the invention is mainly applied to an integrated 2D (two-dimensional) Hall sensor.

A method and device for diagnosing a crankcase ventilation of an internal combustion engine, which enable a diagnosis of a malfunction of an actuator of the crankcase ventilation. The internal combustion engine has at least two cylinder banks to which the crankcase ventilation is supplied, and an actuator is provided via whose position the distribution of the crankcase ventilation to the at least two cylinder banks is influenced. In a first position of the actuator, a different distribution of the crankcase ventilation to the at least two cylinder banks comes about than in a second position of the actuator that differs therefrom. Given simultaneously activated operation of the at least two cylinder banks, the actuator is switched over at least one between the two different positions. For at least one of the at least two cylinder banks, a characteristic variable of the internal combustion engine influenced by the crankcase ventilation is determined prior to and following the switchover operation. A minimum value for a change in the characteristic variable of at least one of the at least two cylinder banks and / or the ratio of the characteristic variable between the at least two cylinder banks is specified for the switchover-related change in the distribution of the crankcase ventilation to the at least two cylinder banks. A malfunction of the actuator is detected if at least one change derived from the ascertained values for the characteristic variable undershoots its assigned expected minimum value in quantitative terms.

The invention discloses a band-gap reference source circuit with a starting circuit, and relates to the technical field of semiconductor integrated circuits. The circuit comprises a starting circuit and a band-gap reference source main body circuit, the starting circuit and the band-gap reference source main body circuit are respectively connected with a power supply voltage end; the starting circuit comprises an NMOS transistor. The band-gap reference source main body circuit at least comprises an operational amplifier, PMOS transistors and a triode. A source electrode of the NMOS transistoris connected with an inverting input end of the operational amplifier, a drain electrode of the first PMOS transistor, an emitting electrode of the first triode and the first resistor; an output end of the operational amplifier is respectively connected with the first PMOS transistor, the second PMOS transistor and the third PMOS transistor, a common end of the drain electrode of the third PMOS transistor and a second resistor is an output end of the circuit, and a grid electrode of the NMOS transistor is connected with the output end; the degenerate point problem of zero current of the wholecircuit is avoided, and an expected stable working point is achieved.

The invention is a kind of all otpical form dresser based on the saganuke ring, which includes an input end, an output end, a fiber coupler, and a fiber ring. The character lies in: there sets the first variable refractive index lenticule, a polarizing disc, the second variable refractive index lenticule and the Faraday polarization apparatus, and fiber coupler on the input end of the signal beam path; there also sets a control beam path, on which there sets a delay device, variable rejector, convex lens, a fiber segment, a three-circle polarization controller, the first WDM coupler and the second WDM coupler. One end of the fiber segment is at the focus of the convex lends, another end of the fiber segment is connected to the fiber ring through the first WDM coupler, there sets the second WMD coupler on the fiber ring with interval L to the first WDM coupler, and the L is little than the semicircle of the fiber ring, the three-circle polarization controller is set on the fiber segment.

The invention discloses a permanent magnet series-parallel connection type variable magnetic circuit adjustable magnetic flux motor, belongs to the field of permanent magnet motors, and aims to solve the problems that the magnetization state of a low-coercivity permanent magnet of a series connection type adjustable magnetic flux motor is difficult to adjust and the power density of a parallel connection type adjustable magnetic flux motor is low. The motor comprises a stator iron core, armature windings, a rotor iron core, V-shaped permanent magnet grooves, low-coercivity permanent magnets, U-shaped permanent magnet grooves, high-coercivity permanent magnets, magnetic isolation grooves and a rotating shaft. Five low-coercive-force permanent magnets and five high-coercive-force permanent magnets are arranged below each magnetic pole, two first high-coercive-force permanent magnets are placed on the upper layer of the V-shaped permanent magnet groove, and the rest space in the groove is provided with the first low-coercive-force permanent magnets. The two ends and the tip end of the V-shaped permanent magnet groove are each provided with a magnetic isolation groove, three second high-coercive-force permanent magnets and three second low-coercive-force permanent magnets are arranged in the U-shaped permanent magnet grooves side by side in the thickness direction, the included angle of the U-shaped permanent magnet grooves is adjustable, and magnetic isolation grooves are formed in the two ends of the U-shaped permanent magnet grooves and the U-shaped bottom corners respectively.

The invention discloses a series-parallel magnetic circuit hybrid magnetic pole type memory motor, which comprises a stator, an armature winding, a hybrid permanent magnet rotor, and a rotating shaft.The armature winding is arranged on the stator. The hybrid permanent magnet rotor is arranged on the inner side of the stator. The rotating shaft is arranged on the inner side of the hybrid permanentmagnet rotor. A plurality of pairs of magnetic poles are arranged on a rotor core of the hybrid permanent magnet rotor. A U-shaped permanent magnet structure composed of a first permanent magnet magnetized in the radial direction and two adjacent second permanent magnets magnetized in the tangential direction is arranged at the N pole of each pair of magnetic poles, and a third permanent magnet magnetized in the radial direction is arranged at the S pole. The first permanent magnets are placed close to the rotating shaft, and the third permanent magnets are placed close to the air gap side. The coercive force of each first permanent magnet and the coercive force of each third permanent magnet are larger than the coercive force of each second permanent magnet. The magnetic regulation rangeof the motor can be broadened, and the stability of the permanent magnet working point can be ensured.

The invention relates to a series hybrid permanent-magnet adjustable magnetic flux motor with reverse salient pole characteristic, and belongs to the field of permanent-magnet motors. By the series hybrid permanent-magnet adjustable magnetic flux motor with reverse salient pole characteristic, the problems that the magnetization level of a low-coercivity permanent magnet is difficult to adjust ina series adjustable magnetic flux motor is solved. The series hybrid permanent-magnet adjustable magnetic flux motor with reverse salient pole characteristic is characterized in that a plurality of quadrature-axis magnetic obstacles are uniformly arranged along a surface of an outer circle of a rotor core, each quadrature-axis magnetic obstacle is sunken and formed at a junction of the quadratureaxis under each magnetic pole and the surface of the outer circle of the rotor core, a tangential low-coercivity permanent magnet is arranged at a position, near to a pole top, in a rotor pole formedbetween each two adjacent sunken regions, a radial high-coercivity permanent body is arranged at a position, corresponding to the sunken region, of the rotor core, the low-coercivity permanent magnetis arranged in a low-coercivity permanent magnet groove, the high-coercivity permanent magnet is arranged in a high-coercivity permanent magnet groove, and the low-coercivity permanent magnet groove and the high-coercivity permanent magnet groove penetrate through the whole motor along an axial direction.

The invention discloses a prime mover output torque equilibrium control system which comprises a hydraulic oil tank, an accumulator, a storage pump transmission connected with an output shaft of the prime mover and a power-steering motor, wherein, the output shaft of the prime mover is transmission connected with the output shaft of a main hydraulic pump; an exit of the storage pump is connected with an opening of the accumulator by a first one-way valve which allows the hydraulic oil to pass through the exit of the storage pump to the opening of the accumulator; the opening of the accumulator is connected with an entrance of the power-steering motor; the entrance of the power-steering motor is connected with the hydraulic oil tank by a second one-way valve which allows the hydraulic oil to enter the entrance of the power-steering motor from the oil tank; and the control system also comprises a torque controller which controls the storage pump and the discharge of the power-steering motor. The invention provides the prime mover output torque regulating system with simple structure, reliable performance, reduced cost and wide application range, which realizes the equilibrium control of the output torque.

The invention discloses a device and a method for realizing 3D printing by using a magnetic control flexible conduit robot, and belongs to the field of additive manufacturing. According to the deviceand the method, a special superimposed external magnetic field is adopted, and after specification accurate superimposition, the superimposed magnetic field has a zero magnetic field point at the geometric center of the superimposed magnetic field, the geometric center has radiation gradient fields near the zero magnetic field point on the plane, and the free end of a magnetic conduit disposed isrepelled in the radiation direction, so that the free end of the magnetic conduit is limited in a region. Therefore, a universal digital control method can be used to control the movement of the zeromagnetic field point, and a complex external magnetic field control mode can be used to control the movement of the free end of the magnetic conduit. A stable, easy-to-control and digitally controlledinvasive printing system is provided.

The invention provides an optical-fiber security early-warning polarization-phase combined control system for the security protection and early warning of buried pipelines, structures or important facilities and regions, which relates to the technical field of mechanical vibration measurement, impact measurement and pipeline systems. A polarization modulator (202) is connected in serial between a continuous monochromatic laser (101) and a wave combining-dividing device (203); the wave combining-dividing device (203) is connected with two photoelectric detectors (309) and (310) through optical fiber; the output ends of the two photoelectric detectors (309) and (310) are connected with an A / D (312) and an A / D (313) respectively; the output ends of the A / D (312) and the A / D (313) are connected with photoelectric signal processing circuits (311) respectively; the output end of one photoelectric signal processing circuit (311) is connected with a polarization controller (201); the output end of the polarization controller (201) is connected with the polarization modulator (202) and a phase modulator (206) connected in serial with optical fiber (1) or (2); the output of the other photoelectric signal processing circuit (311) is connected with a phase controller (205); and the output of the phase controller (205) is connected with the phase modulator (206) connected in serial with the optical fiber (1) or (2).

The invention relates to a method for controlling a wind farm (112) in order to damp low-frequency electrical oscillations, in particular subsynchronous resonances, in an electrical supply grid (306),the supply grid (306) having a grid voltage with a nominal grid frequency, the wind farm (112) comprising at least one wind turbine (100, 300) connected to the electrical supply grid (306), comprising the steps: sensing at least one low-frequency electrical oscillation of the electrical supply grid; determining an oscillation characteristic of each of the at least one sensed oscillation, the oscillation characteristic describing at least one property of the sensed oscillation; specifying an active-power damping signal (DeltaP) and / or a reactive-power damping signal (DeltaQ) for damping the atleast one low-frequency oscillation characterized by the oscillation characteristic; feeding in an active power component in accordance with the active-power damping signal or a reactive power component in accordance with the reactive-power damping signal, the active-power damping signal (DeltaP) and the reactive-power damping signal (DeltaQ) being specified in dependence on the determined oscillation characteristic.

The invention discloses a Fizeau interference-based ultra-weak grating perimeter security and protection system. The system comprises a detection optical cable, a query unit and a control unit; the detection optical cable is an optical fiber-armored micro-vibration optical cable which is provided with a large number of ultra-weak broad-spectrum gratings; the query unit is connected with the detection optical cable and is used for generating and splitting the reflection signals of target gratings in an array; and the control unit is connected with the query unit and is used for generating pulse control signals, synchronously carrying out phase demodulation, judging an intrusion behavior through signal processing and pattern recognition, and positioning the intrusion behavior. According to the Fizeau interference-based ultra-weak grating perimeter security and protection system of the invention, a characteristic that ultra-weak grating pairs can generate Fizeau interference is utilized, a long-distance optical fiber perimeter is divided into a plurality of micro protection regions, whether intrusion behaviors exist in the protection regions is judged through detecting Michelson interference phenomena of the reflection light of the grating pairs in the micro protection regions, a quick protection region scanning query method is used in combination, and therefore, all-optical fiber distributed sensing can be realized. With the Fizeau interference-based ultra-weak grating perimeter security and protection system adopted, problems such as low sensitivity, short sensing distance, poor positioning performance and false alarm of a traditional distributed perimeter security and protection system can be solved. The Fizeau interference-based ultra-weak grating perimeter security and protection system has a bright application prospect in the perimeter security and protection field.

A method for regulating a converter to autonomously stabilize the frequency of a microgrid comprising a generating set, the method comprising: a determination of a power regulation variable from a power variation resulting from the initial power setpoint from which the estimated active power and the active damping value have been subtracted, a calculation of a second power variation at least from the difference between the power regulation variable and the estimated active power, and a determination of a frequency command value for commanding the converter from the second power variation, a reception of a frequency value characteristic of a load variation of said microgrid to which the converter is intended to be connected, and a determination of an active damping value from the received frequency value.