61results about How to "Suppresses frequency fluctuations" patented technology

A non-contact power transmission system comprises: a primary coil including a power supply coil and a magnetic resonance coil; and a secondary coil including a load coil, thereby transmitting an electric power from the power supply coil at a self-resonating frequency of the magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of the secondary coil through magnetic coupling, with non-contact, wherein the electric power is transmitted, with non-contact, with applying magnetic coupling in coupling between the power supply coil and the magnetic resonance coil and coupling between the magnetic resonance coil and the load coil.

A SAW device has an IDT which is provided on the principal surface of a quartz crystal substrate having Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, 42.79≦|ψ|≦49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. A first direction (X′ axis) perpendicular to the electrode fingers and the conductor strips intersects the electrical axis (X axis) of the quartz crystal substrate at an angle ψ. At least a part of the IDT and the reflectors are arranged in a second direction intersecting the first direction at an angle α of 1.0°≦α≦2.75°. An excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.

A SAW device 11 has an IDT which is provided on the principal surface of a quartz crystal substrate 12 having Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, 42.79°≦|ψ|≦49.47°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. The wavelength λ of the SAW and the depth G of the inter-electrode-finger grooves satisfy 0.01λ≦G. An IDT line occupancy η and the depth G of the inter-electrode-finger grooves satisfy a predetermined relational expression. The IDT line occupancy η and a reflector line occupancy ηr satisfy the relationship η<ηr. Therefore, an excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.

A SAW device includes an IDT which is provided on the principal surface of a quartz crystal substrate having Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, |ψ|≠90°×n (where n=0, 1, 2, 3)) and excites a Rayleigh wave (wavelength: λ) in a stopband upper end mode. Inter-electrode-finger grooves are recessed between electrode fingers of the IDT. An IDT line occupancy η and an inter-electrode-finger groove depth G satisfy a predetermined relationship in terms of the wavelength λ, such that the SAW device has a frequency-temperature characteristic of a cubic curve having an inflection point between a maximum value and a minimum value in an operation temperature range. The inflection point is adjustable to a desired temperature or a desired temperature range depending on the IDT line occupancy η within an operation temperature range.

The invention discloses a frequency control method and system for an interconnected power system containing energy storage resources. The control method comprises the following steps: establishing a frequency response model of a regional interconnected power system containing energy storage frequency modulation resources; performing frequency division processing on the ACE signal to obtain a powerreference value borne by a traditional unit and an energy storage resource; establishing a space state model and discretizing the space state model; designing a distributed model prediction controller, and establishing an optimization objective function and constraint conditions; and solving a quadratic programming problem formed by the optimal objective function and the constraint condition to determine an optimal control sequence, and enabling a first control variable in the control sequence to act on a traditional unit and energy storage resources to realize optimal control. The control strategy provided by the invention can reasonably allocate the frequency modulation responsibilities of a traditional unit and the energy storage resources, gives play to the advantages of quick outputof energy storage and large frequency modulation capacity of the unit, and can quickly stabilize the frequency fluctuation caused by load and new energy injection in a power system.

The invention provides a control method and a control system for wind power participating frequency modulation of an electric power system. The control method comprises regulating and controlling the frequency of the electric power system by using rotor kinetic energy and a storage battery energy storage system. According to the control method for wind power participating frequency modulation of the electric power system based on combined effect of the rotor kinetic energy and the storage battery energy storage system, the wind energy is sufficiently utilized, the configuration capacity of the energy storage system is reduced, and the economical efficiency of wind field operation is improved. The control method and the control system can also play better roles even under the condition of relatively great load disturbance.

A non-contact power transmission system comprises: a primary coil including a power supply coil and a magnetic resonance coil; and a secondary coil including a load coil, thereby transmitting an electric power from the power supply coil at a self-resonating frequency of the magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of the secondary coil through magnetic coupling, with non-contact, wherein the electric power is transmitted, with non-contact, with applying magnetic coupling in coupling between the power supply coil and the magnetic resonance coil and coupling between the magnetic resonance coil and the load coil.

A SAW device has an IDT which is provided on the principal surface of a quartz crystal sustrate having Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦42°, ψ) and excites a SAW in a stopband upper end mode. Inter-electrode-finger grooves 8 are recessed between the electrode fingers of the IDT. When the Euler angle ψ is 42.79°≦|ψ|≦49.57°, the thickness H of the electrode fingers of the IDT is set to be within 0.055 μm≦H≦0.335 μm, preferably, 0.080 μm≦H≦0.335 μm. When the Euler angle ψ is |ψ|≠90°×n (where n=0, 1, 2, 3), and the thickness H of the electrode fingers is set to 0.05 μm≦H≦0.20 μm.

The invention discloses a method for quickly and effectively inhibiting frequency fluctuation of an island power grid. The conventional methods cannot effectively inhibit the influence of impact load and wind power field output change on the frequency of the island power grid. The invention adopts the technical scheme that: a frequency correction module is arranged in a constant active power controller on the inverter side of voltage source converter high-voltage direct current (VSC-HVDC), the power set value of the constant active power controller can track the change of system frequency through the frequency correction module, and the power fed into the island power grid is changed by using the quick response property of a voltage source converter (VSC) so that the island power grid still keeps active power balance under the action of impact load and during abrupt change of the wind power field output and the frequency of the system is kept stable.

The invention discloses a method for a permanent magnet direct drive wind power generation system to participate in power grid frequency regulation. A generator side converter, a power grid side converter and an energy storage unit side converter are controlled. An energy storage unit converter controls voltage and combines a rotor position angle and direct current link voltage to acquire a PWM drive signal of the energy storage unit side converter through space vector modulation SVM to control a motor. When the motor accelerates to the highest rotation speed, a power / current closed-loop control mode is switched into a rotation speed / current closed-loop control mode, and the rotation speed is given as the rated rotation speed of a flywheel motor. When the flywheel motor continuously slows down to zero, the rotation speed outer ring given value is set to zero, and the rotation speed of the motor is controlled as zero. Through rotation speed / current closed-loop control, the flywheel motor runs at zero speed. According to the method, a wind turbine can acquire a stable frequency regulation ability in all conditions, and the grid connection adaptability of the wind power system is improved.

The invention discloses a method for allowing a permanent magnetic direct drive wind power generation system to participate in frequency adjustment of a power grid on the basis of fuzzy control. A permanent magnetic direct drive wind power unit can change frequency adjustment power output by the permanent magnetic direct drive wind power unit according to real-time frequency of the power grid through coordination control over a motor side convertor, a power grid side convertor and a flywheel energy storage unit side convertor. The method has the advantages that maximum wind power tracking control can be achieved while auxiliary frequency adjustment power is provided for the power grid; control parameters of the power grid can be flexibly changed under all working conditions according to power grid frequency conditions, equivalent inertia and damping of the system can be dynamically adjusted, and the permanent magnetic direct drive wind power unit can participate in frequency adjustment of the power grid to the maximum degree.

The present invention provides an acoustic wave device, which can inhibit the increment of electric resistance and the deterioration of frequency characteristics, and inhibit the deterioration of power resistance test characteristics even if the acoustic device is placed under a high temperature. The acoustic device includes a piezoelectric substrate (2) and an IDT electrode (3) formed thereon. The IDT electrode (3) is formed by laminated metallic membrances by a plurality of metallic membrances, wherein the laminating metallic membrances have a first metallic membrance (3b) formed by AI or AI-based alloy, a second metallic membrance (3e) formed by metal or alloy other than that used in the first metallic membrance, and a Cu membrance (3c) and a Ti membrance (3d) disposed between the first and second metal metallic membrances, wherein the Cu membrance (3c) within the Cu membrance (3c) and the Ti membrance (3d) is configured on the first metallic membrance (3b) side.

The invention relates to an optical module for an atomic oscillator and an atomic oscillator. The optical module for an atomic oscillator using a quantum interference effect includes a light source adapted to emit light including a fundamental wave having a predetermined wavelength, and sideband waves of the fundamental wave, a wavelength selection section receiving the light from the light source, and adapted to transmit the sideband waves out of the light input, a gas cell encapsulating an alkali metal gas, and irradiated with light transmitted through the wavelength selection section, and a light detection section adapted to detect an intensity of light transmitted through the gas cell, and the wavelength selection section includes a fiber Bragg grating, and a temperature control section adapted to control temperature of the fiber Bragg grating.

The present invention provides a vehicle lamp capable of suppressing frequency fluctuation of a switching converter. A boost converter (410) having an ADJ terminal boosts a power supply voltage to generate a direct current voltage (VDC) stabilized at a variable target voltage corresponding to voltage of the ADJ terminal (VADJ), a buck converter (430) receives the direct current voltage (VDC) to supply a driving current (ILAMP) to the light source (310). A hysteresis controller having a hysteresis control mode is configured to stabilize the driving current (ILAMP) between a peak value and a bottom value around the target current and to change a difference between the peak value and the bottom value such a switching frequency of the buck converter (430) approaches a constant value, and a voltage adjusting circuit (460) is configured to dynamically change the voltage of the ADJ terminal (VADJ) of the boost converter (410) according to an output voltage (VOUT) of the buck converter (430).

A SAW device has an IDT which is provided on the principal surface of a quartz crystal sustrate having Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, ψ) and excites a SAW in a stopband upper end mode. Inter-electrode-finger grooves 8 are recessed between the electrode fingers of the IDT. When the Euler angle ψ is 42.79°≦|ψ|≦49.57°, the thickness H of the electrode fingers of the IDT is set to be within 0.055 μm≦H≦0.335 μm, preferably, 0.080 μm≦H≦0.335 μm. When the Euler angle ψ is |ψ|≠90°×n (where n=0, 1, 2, 3), and the thickness H of the electrode fingers is set to 0.05 μm≦H≦0.20 μm.

A sound emitter (1) according to an embodiment comprises an oscillator (10), and an exciter (piezoelectric oscillation element (20)). The exciter (20) is disposed upon the oscillator (10), receives an input of an electrical signal, and oscillates. The exciter (20) further comprises either protrusion parts (29) or depression parts (39) on the oscillator (10) side surface thereof.

A SAW device has an IDT which is provided on the principal surface of a quartz crystal substrate having Euler angles (−1.5°≦φ≦1.5°, 117°≦θ≦142°, 42.79≦|ψ|≦49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. A first direction (X′ axis) perpendicular to the electrode fingers and the conductor strips intersects the electrical axis (X axis) of the quartz crystal substrate at an angle ψ. At least a part of the IDT and the reflectors are arranged in a second direction intersecting the first direction at an angle α of 1.0°≦α≦2.75°. An excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.

A piezoelectric vibrating piece includes a pair of vibration arm portions that is placed in a row in a width direction; a base portion to which proximal end sides in the pair of vibration arm portions in an extending direction are connected; and weight metal films that are formed on outer surfaces of the vibration arm portions, wherein the weight metal films are formed in positions that avoid regions of tip portions in the vibration arm portions in a longitudinal direction.

To provide a condensate flow rate control device and a control method for a power plant which improve responsiveness to frequency fluctuations or requested load changes and can suppress frequency fluctuations with precision or improve precision with which output power conforms to requested load instructions. A power plant to which a condensate flow rate control device is adapted includes a deaerator to which condensate generated by a condenser is supplied via a deaerator water level adjustment valve and into which bleed steam from a steam turbine is introduced. The condensate flow rate control device has a water level adjustment unit for executing condensate flow rate control, wherein the water level adjustment unit adjusts pressure in a condensate flow path extending from the deaerator water level adjustment valve to the deaerator so that inputted frequency fluctuations are suppressed or an output value of a generator conforms to inputted requested load changes.

The invention relates to an optical module for atomic oscillator and atomic oscillator. The optical module for an atomic oscillator uses a quantum interference effect. The optical module includes a light source adapted to emit light including a fundamental wave having a center wavelength, and sideband waves of the fundamental wave, a wavelength selection section receiving the light from the light source, and adapted to transmit the sideband waves out of the light input, a gas cell encapsulating an alkali metal gas, and irradiated with light transmitted through the wavelength selection section, and a light detection section adapted to detect an intensity of light transmitted through the gas cell. The wavelength selection section includes an etalon and a temperature control section adapted to control temperature of the etalon.

The invention discloses a cascaded hybrid direct current system and a control method. The cascaded hybrid direct current system comprises a rectifier side LCC converter station, an inverter side high-end LCC converter station, an inverter side low-end VSC converter station and the inverter side additional controller. The system has the advantages that the frequency fluctuation of the receiving endnew energy system can be suppressed by utilizing the cascaded hybrid direct-current inverter side additional frequency controller, and the frequency stability of the receiving end system is improved;coordination control between VSCs is carried out through constant direct-current voltage control of the VSC1 inverter, constant power control including backup constant direct-current voltage controlof the VSC2 inverter and constant power control of the VSC3 inverter, the power control range can be effectively widened, and the effect of improving the frequency stability of a large-scale new energy access system is achieved.

The invention relates to an optical module for an atomic oscillator and an atomic oscillator. The optical module for an atomic oscillator using a quantum interference effect includes a light source adapted to emit light including a fundamental wave having a predetermined wavelength, and sideband waves of the fundamental wave, a wavelength selection section receiving the light from the light source, and adapted to transmit the sideband waves out of the light input, a gas cell encapsulating an alkali metal gas, and irradiated with light transmitted through the wavelength selection section, and a light detection section adapted to detect an intensity of light transmitted through the gas cell, and the wavelength selection section includes a fiber Bragg grating, and a voltage application section adapted to apply a voltage to the fiber Bragg grating.

A storage battery system control method includes at least the following steps. Respective current SOC (state of charge) values of the large capacity storage battery system and the high power storage battery system are acquired. Electrical power, which is required to operate the frequency control service for the purpose of suppressing frequency fluctuations, to the large capacity storage battery system and the high power storage battery system, in accordance with the respective SOC values. The respectively allocated electrical power is charged or discharged by driving the large capacity storage battery system, or alternatively, the high power storage battery system, or alternatively, the large capacity storage battery system and the high power storage battery system.

The invention discloses a quasi-PCI and PI combined control single-phase photovoltaic grid-connected inverter current control method in the technical field of new energy photovoltaic power generation.The method comprises the following steps of: adding a cut-off frequency into a proportional complex integral (PCI) controller to form a quasi-PCI controller; realizing a complex number field in a single-phase quasi PCI through a lag output item of a second-order generalized interactor (SOGI); taking a difference value between a given grid-connected current iref and an actual grid-connected current iL as the input of the quasi-PCI controller; taking a difference value between a grid-connected current direct current quantity reference value IL-dc and a grid-connected current direct current quantity as an input of a PI controller; and after the output of the quasi PCI controller and the output of the PI controller are added, controlling the switching-on and switching-off of an inverter switching tube through PWM modulation. According to the invention, the influence of power grid voltage fluctuation and frequency offset on the grid-connected current is suppressed, the direct-current component of the grid-connected current is eliminated, and high-quality control is realized while the design of a non-isolated photovoltaic grid-connected inverter current controller is simplified.

The invention provides an equal-phase multi-phase clock signal generating circuit. The purpose is to minimize the increase in the number of components, to suppress the increase in the area of ​​the semiconductor substrate-like circuit and the increase in power consumption, and to make the duty ratio of the output equal-phase multi-phase clock signal constant independently of the duty ratio of the input clock signal . In the equal-phase multi-phase clock signal generation circuit of the present invention, the input clock signal is converted into a complementary clock signal which has been divided by 2, and then input to a complementary voltage-controlled delay element column. Since the frequency of the input clock signal is divided by 2, the frequency-divided complementary clock signal becomes a clock signal having a constant duty ratio independent of the duty ratio of the input clock. By inputting the frequency-divided complementary clock signal to the voltage-controlled delay element column, and phase-comparing the complementary output signal from the voltage-controlled delay element column with the frequency-divided complementary clock signal, it is possible to output a signal synchronized with the above-mentioned input clock. Equiphase multiphase clock signal.

The invention discloses a method for improving the robustness of a droop control system of a multi-inverter parallel low-voltage microgrid. The method comprises the following steps: 1) establishing amathematical model represented by active power and reactive power output by inverters in the multi-inverter parallel low-voltage microgrid; 2) simplifying the mathematical models of active power and reactive power output by the inverter in the step 1); 3) obtaining a conventional droop control equation according to the P-omega and Q-U droop characteristic schematic diagrams; 4) adding a frequencyand voltage compensation module in the conventional droop control equation in the step 3) to obtain a new droop control equation; 5) performing small signal model analysis on the inverter output active and reactive power simplified mathematical model obtained in the step 2) and the new droop control equation obtained in the step 4), and verifying the stability of the control system. According to the invention, the frequency stability of the multi-inverter parallel low-voltage microgrid can be effectively improved, and the frequency fluctuation phenomenon in the mode switching process is reduced.

The invention discloses a situation awareness and guiding method for suppressing power grid frequency fluctuation under an island medium-voltage micro-grid. Situation awareness and a guiding method are combined and applied to the island medium-voltage micro-grid for the first time to ensure that the island medium-voltage micro-grid can continuously stabilize the frequency when the output power of a distributed power supply fluctuates. The method comprises the steps of conducting island medium-voltage micro-grid modeling; performing situation awareness based on historical data; and implementing a situation guiding method for suppressing frequency fluctuation. According to the method provided by the invention, when the island medium-voltage micro-grid runs, an information acquisition unit firstly extracts the wind speed of a fan and the frequency information of the power grid as historical data, then situation awareness is performed, advanced prediction is conducted on the frequency situation of the power grid system, then the predicted values of the active power and the reactive power are obtained according to the coupling relationship of the island medium-voltage micro-grid, and a situation decision system and a situation execution system are controlled to realize a situation guidance function, so that frequency fluctuation can be effectively suppressed, impact on a power grid system is reduced, and the system frequency can be continuously kept stable when the output power of the distributed power supply fluctuates.

To provide a thermoelectric module that can be arranged in a limited space and is excellent in heat exchange capability, and to provide an optical transmitter comprising the same. A first insulating substrate (21) comprises the following components: a substrate body (21a) with a first opposite surface (21c); and a protruding part (21b) which is integrally formed with the substrate body (21a) on an opposite surface that is at the opposite side of the first opposite surface (21c) and is opposite with an area provided with an electrode. The protruding part (21b) is provided with a thermoelectricconversion element (24) and a connection part (42) connected with a cooled object. The heat generated by the cooled object is efficiently transferred from the protruding part (21b) to a second insulating substrate (22) with the thermoelectric conversion element (24).

A storage battery system control method includes at least the following steps. Respective current SOC (state of charge) values of the large capacity storage battery system and the high power storage battery system are acquired. Electrical power, which is required to operate the frequency control service for the purpose of suppressing frequency fluctuations, to the large capacity storage battery system and the high power storage battery system, in accordance with the respective SOC values. The respectively allocated electrical power is charged or discharged by driving the large capacity storage battery system, or alternatively, the high power storage battery system, or alternatively, the large capacity storage battery system and the high power storage battery system.