48 results about "Synchronous condenser" patented technology

The invention relates to a wide range high accuracy fast laser distance measuring method and device based on multiple frequency synchronous condenser. The multiple frequency modulating signals are taken characteristic pre-compensation weight summarizing at laser emitting unit. After compounding, the laser power is modulated to take distance measuring. Synchronous band pass filter frequency selection and phase determination method is used to taken signal process. The method could gain the distance measuring result of distance measuring frequency in multiple frequency modulating distance measuring, and gain the final distance result. The distance measuring speed and real time is ensured. It also avoids measuring error coursed by the location movement of the target.'

The present invention provides a substation voltage control method of realizing comprehensive coordination of continuous equipment and discrete equipment, belonging to power system automatic voltage control technical field. The method includes following steps: collecting the real-time operation data of the substation to be controlled when the control cycle starts; judging each collecting variable based on the preestablished expert rules, calculating the tap joint gear position control variable of the regulating transformer or determining adjustment reactive-load compensation equipment; if is a adjustment reactive-load compensation equipment, the needed reactive-load adjusting variable delta Qg is calculated, the delta Qg processes reactive distribution calculation between a synchronous condenser and a capacitor reactance, the reactive set value of the synchronous condenser and the capacitor reactance sequence needed switch are calculated; the state of the transformer equipment is adjusted according to the obtained reactive set value and the capacitor reactance sequence needed switch and the tap joint gear position control variable of the transformer, realizing ring closed control. The invention improves ability of network bearing accident disturbance, improving the security of the network.

A power generation system is disclosed for supplying power to an electrical grid. The system comprises a synchronous machine and coupling means for coupling the synchronous machine to a prime mover. Control means are provided to control the system such that the system is selectively operable in two modes. In the first mode, the synchronous machine is coupled to the prime mover and acts as a synchronous generator to supply power to the grid. In the second mode the synchronous machine is decoupled from the prime mover and acts as a synchronous condenser. This can allow parameters of the grid, such as power factor and voltage, to be adjusted.

The present application thus provides a method of operating a synchronous condenser. The method may include the steps of accelerating a gas turbine engine to full speed no load conditions, connecting a generator attached to the gas turbine engine to an electric power grid, turning off a flow of fuel to the gas turbine engine, operating the generator in a synchronous condenser mode, and providing or absorbing reactive power to or from the electric power grid.

The invention discloses an electro-hydraulic synchronous control system of a ring gate for a hydro turbine, which consists of a pilot valve bank, diffluence motors and oil distributing modules. The output of the oil circuit of the pilot valve bank is connected respectively to six synchronous diffluence motors and six corresponding oil distributing modules. A servomotor is arranged at the end of each oil distributing module and serves as an actuating device of the hydraulic system. A radial plunger type diffluence motor is used to distribute hydraulic oil to ensure amount of inlet oil is basically equal to that of outlet oil for each servomotor hydraulic cylinder. Each oil distributing module is provided with two fine-coarse tuning magnetic ball valves which accurately control flow to the servomotor through a PLC so as to ensure the synchronous control of the six servomotors reaches the design requirement. The electro-hydraulic synchronous control system has the advantages that high-precision mechanical hydraulic electrical synchronous control and speed control are realized by controlling the speed of the servomotors through controlling flow rate of the electro-hydraulic proportional directional valve on the basis of full functional ability, safety and reliability.

An electric power generation plant has at least two synchronous machines and a source of mechanical power (torque), coupleable such that one or more of the synchronous machines can be operated as a generator while one or more is operated as a synchronous condenser. Field exciters, controlled shaft couplings, starters and switching sequences control starting, restarting and switching into simultaneous operation as generators, as condensers, or as one or more generators and condensers synchronously coupled to one another along a drive train. The disclosed configurations include modifications of existing generator installations such as decommissioned plants, such as by controllably coupling a second synchronous machine to a drive train, for use as a condenser for power factor control when needed or as an added source of generator capacity during times of high demand.

A hybrid high inertia synchronous condenser facility for delivering reactive power to an electrical grid comprises at least one synchronous condenser, a voltage transformer connecting the at least one synchronous condenser to an electrical grid, at least one bank of capacitors switchably connected to the electrical grid, at least one bank of reactors switchably connected to the electrical grid, and a controller for controlling connection of the voltage transformer, the at least one bank of shunt capacitors, and the at least one bank of shunt reactors to the electrical grid. The synchronous condenser is equipped with a flywheel.

An AC excitation synchronous condenser and a control method, an AC-excitation induction machine, a full-controlled AC excitation converter, a grid-side converter and a controller. The AC-excitation induction machine is the core power converting device, and its stator and rotor windings are AC windings with terminals. The controller is configured to control the full-controlled AC excitation converter to perform excitation and speed regulation on the AC-excitation induction machine and also control the grid-side converter to ensure the excitation capability of the full-controlled AC excitation converter, so that support and regulation of the active power and reactive power are achieved.

The invention discloses a synchronous condenser site selection method based on long distance power transmission, and belongs to the field of power transmission line reactive power compensation equipment site selection. The method solves the problem that local direct current commutation failure probability and multi-direct current system continuous commutation failure probability are high. The method establishes a power transmission system model according to actual power transmission situation. A power transmission system includes a power generation unit, a transmission unit and multiple receiving ends. The power generation unit includes conventional power stations and distributed new energy power stations. Three-phase short-circuit fault simulation analysis of the system is carried out byusing power system simulation software, and short-circuit current when a fault occurs is obtained through a system stability model. A short-circuit ratio of a direct current fed receiving alternatingcurrent system is calculated, a voltage stability weak point is predicted according to the short-circuit ratio of the direct current fed receiving alternating current system, and a synchronous condenser is arranged on a line where the weak point is located. The synchronous condenser site selection method based on the long distance power transmission cancels connection between all direct current systems and effectively improves grid strength of a multi-receiving end alternating current system, enhances the system voltage support capability and reduces the commutation failure probability.

The invention discloses a double-axis excitation device for synchronous condensers. The double-axis excitation device comprises a reactive power calculation device, a comparison circuit, a low-excitation protection circuit, a control circuit and a q-axis excitation regulator; a voltage transformer and a current transformer are respectively connected with a voltage input end and a current input endof the reactive power calculation device; an output end of the reactive power calculation device is connected with a measurement input end of the comparison circuit; a given reactive power circuit isconnected with a power input end of the comparison circuit; an output end of the comparison circuit is connected with an input end of the low-excitation protection circuit; an output end of the low-excitation protection circuit is connected with a control input end of the control circuit; the voltage transformer is connected with a measurement input end of the control circuit; a given voltage circuit is connected with a voltage input end of the control circuit; an output end of the control circuit is connected with a differential voltage input end of the q-axis excitation regulator; the givenvoltage circuit is connected with a given input end of the q-axis excitation regulator; and an output end of the q-axis excitation regulator is connected with a q-axis excitation winding. The excitation device is capable of avoiding the problems of end heating and unit power angle increase caused by excessive phase-in of the condenser, thereby ensuring the static stability of unit operation.

The liquid crystal display device of the present invention comprises a timing controller, a gate driving unit, a data driving unit, a liquid crystal panel, a lamp, an inverter, a mode setting unit, and an inverter control unit. The mode setting unit discriminates a moving-image mode and a still-image mode and provides a specific control signal to the inverter control unit in accordance with the discriminated mode. The inverter control unit operates the inverter in either synchronous mode or asynchronous mode by applying or withholding a timing signal to the inverter, in response to the control signal from the mode setting unit. Preferably, the timing signal is a gate select signal CPV that becomes a horizontal synchronous signal. According to the present invention, a moire phenomenon in still-image mode can be eliminated by driving the lamp in synchronization with the horizontal synchronous signal and the problem of lighting malfunction of the lamp in the moving-image mode can also be eliminated by driving the lamp at the frequency of the inverter itself.

The invention relates to a control method and a control device of a photovoltaic- diesel oil compound power supply system, computer equipment, and a storage medium. The control method comprises steps that a changing value of solar radiation illuminance, a real-time maximum output power of a photovoltaic power generation system, and micro-power grid load are acquired, and according to the changing value of solar radiation illuminance, the real-time maximum output power of the photovoltaic power generation system, and the micro-power grid load, the photovoltaic power generation system is operated in a frequency adjusting mode, an active power adjusting mode, or a maximum power point tracking mode; in the active power adjusting mode, backup active power is reserved for the photovoltaic system according to the output power of the photovoltaic system and the stored maximum power point; according to the operation mode of the photovoltaic power generation system, a diesel generator is operated in a generator mode or a synchronous capacitor mode. By adopting the control method, the output power of the photovoltaic power generation system is adjusted freely according to the requirements of the micro-power grid under the condition of the maximum power, and therefore a certain power residual is kept to participate in a micro-power grid auxiliary adjusting function, and then the frequency stability and the voltage stability of the micro-power grid are improved, and costs are reduced.

A method of configuring a power generation unit for synchronous condensing operation includes coupling a clutch to a generator shaft of a generator without moving the generator along a generator axis of the generator shaft. The method also includes coupling the clutch to a turbine shaft of a turbine via a spacer without moving the turbine along a turbine axis of the turbine. Furthermore, the generator shaft is configured to support a weight of the clutch without a clutch pedestal support.

Systems and methods for controlling an inertia of a synchronous condenser are described. An example system may include a motor, bidirectional power source, and at least one control device. The motor may be configured to alter a rotation of a condenser shaft to obtain a desired inertia of a synchronous condenser during a power disturbance event. The bidirectional power source may be coupled to the motor. The at least one control device may be configured to identify the power disturbance event, determine an amount of power to supply to or receive from the motor to obtain the desired inertia, and control the supply of power from the power source to the motor or from the motor to the power source based upon the determined amount of power.

The invention relates to a pipeline vibration reduction device and a configuration method thereof. The pipeline vibration reduction device comprises a plurality of bottom plates, the plurality of bottom plates are sequentially hinged end to end through hinges to form a long chain, the long chain is wound on a pipeline, an L-shaped connecting plate is hinged to each of the bottom plates at the twoends of the long chain through hinges, the opposite end faces of the two L-shaped connecting plates are respectively provided with holes, and the two L-shaped connecting plates are connected through bolts; and the outer end face of each bottom plate is movably connected with a frequency-adjustable vibration absorber for absorbing vibration. The pipeline vibration reduction device is simple in structure, the vibration absorbers and the bottom plates are movably connected, the two L-shaped connecting plates are movably connected, and installation is convenient. The frequencies of the vibration absorbers are adjustable, so that vibration of the synchronous condenser connection pipeline can be suppressed, and long-term stable use of the pipeline is guaranteed. The pipeline vibration reductiondevice can also be popularized and applied to suppressing vibration of various frequencies of different models of pipelines.

The invention discloses a preaccess high impedance-based synchronous condenser starting grid-connected circuit and a control circuit. The circuit comprises a synchronous condenser, a machine-end mainAC circuit breaker, an AC three-phase transformer, a power grid and a preaccess circuit, wherein the preaccess circuit comprises a preaccess AC circuit breaker, a preaccess resistor and a preaccess inductor which are sequentially connected, wherein an AC outlet end of the synchronous condenser is connected with the machine-end main AC circuit breaker; the other side of the machine-end main AC circuit breaker is connected with the AC three-phase transformer; the other side of the AC three-phase transformer is connected with the AC power grid; and the preaccess circuit is connected with the machine-end main AC circuit breaker in parallel. According to the preaccess high impedance-based synchronous condenser starting grid-connected circuit, impulse voltage and permanent magnet current generated in the starting process are reduced, and smooth starting and grid-connection of the synchronous condenser are achieved.

The invention relates to a system for synchronous control of synthetic test of high-voltage electrical apparatuses. The system comprises a power circuit, a sensor signal detection circuit, a conditioning circuit, a computer, an execution circuit and an input display device. The power circuit is used for supplying power to the system, the sensor signal detection circuit is used for receiving voltage and/or current signals acquired by sensors in synthetic test, the conditioning circuit is used for converting input signals into digital signals, the computer is used for processing the digital signals and outputting control signals, the execution circuit is used for receiving the control signals and outputting corresponding electric ignition signals, and the input display device is used for inputting and displaying synthetic test control parameters. The invention further provides a corresponding method for synchronous control. Various requirements on the synthetic test of the high-voltage electrical apparatuses can be met, error of current prediction zero is reduced, and success rate of the synthetic test is increased; the input signals of computer access processing are selected according to modes of the synthetic test, and a corresponding control signal output step is executed; the input signals include of one or combinations of more of magnetic potentiometer current signals, potentiometer voltage signals and current transformer current signals.