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354 results about "Automatic Generation Control" patented technology

In an electric power system, automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary. The balance can be judged by measuring the system frequency; if it is increasing, more power is being generated than used, which causes all the machines in the system to accelerate. If the system frequency is decreasing, more load is on the system than the instantaneous generation can provide, which causes all generators to slow down.

Control method for coordination and automatic power generation of coal quality self-adaptive thermal power generating unit

InactiveCN101788155AEnsure coordinationGuaranteed AGC control indicatorsFuel supply regulationSteam pressureAir volume
The invention provides a control method for coordination and automatic power generation of a coal quality self-adaptive thermal power generating unit. The method comprises the following steps of: 1, compressively determining the coal quality according to parameters including first-level pressure of a steam engine, drum pressure, coal feed, unit load and the like; 2, by the determined coal quality, performing the coal quality self-adaptive control over main control systems of fuel, coordination, air delivery and the like; 3, by core control strategies of boiler load commands, main steam pressure settings, a coal quality self-checking positive load upper limit and the like, realizing the control over the coal quality self-adaptive coordination and automatic power generation of the thermal power generating unit; and 4, realizing the automatic safe operation of the thermal power generating unit by improving safety locking conditions of the thermal power generating unit. The method has the following obviously advantages that: under a fluctuating condition of the coal quality of the thermal power generating unit, the automatic power generation and the coordination control of the thermal power generating unit are unnecessarily intervened by people, and the scheduling requirements are still met; and compared with the conventional control method, the control method of the invention has the advantages that: the accuracies of the main controlled parameters of the thermal power generating unit are further improved; and simultaneously, the automatic power generation control indexes and the safety and the economy of the thermal power generating unit are enhanced.
Owner:云南电力试验研究院(集团)有限公司

Design method of automatic generation control model under intermittent energy grid-connection

The invention relates to the field of the renewable energy with grid-connected operating, in particular to a design method of an automatic generation control model under an intermittent energy grid-connection. The design method of the automatic generation control model under the intermittent energy grid-connection includes the steps of building second-dimensional disturbance source of time-amplitude disturbed by grid-connected intermittent energy, analyzing the power fluctuation feature of a grid, determining a distribution scheme for an automatic generation control (AGC) system assembly, determining the size and the type of the spare power supply of the AGC system, making a control strategy for the AGC system, selecting frequency deviation coefficient and determining the design parameter of automatic generation control model. The design method of the automatic generation control model under the intermittent energy grid-connection relates to the influences of a large-scale wind power and a solar photovoltaic power to a secondary frequency modulation of the power grid, can build an automatic generation control model and the parameter on the basis of the influence, and therefore effectively copes with an intermittent power disturbance of the wind power and the photovoltaic power supply, enhances the secondary frequency modulation effect of the power grid under the intermittent energy power supply fluctuation, and improves the acceptance ability of the power grid for renewable energy.
Owner:CHINA ELECTRIC POWER RES INST +2

Active steering system combined with electrical power-assisted steering function and control method thereof

The invention relates to an active steering system combined with an electrical power-assisted steering function and a control method thereof, belonging to the field of vehicle steering systems. The system sequentially comprises a steering wheel, a steering input shaft, a planetary gear mechanism, a steering output shaft, a steering engine, a steering tie rod, a steering motor, a steering wheel angle sensor, a yaw velocity sensor, a lateral acceleration sensor and an ECU performing automatic steering control. The system is characterized by further comprising a steering wheel torque sensor mounted on the steering input shaft, a turbine worm retarding mechanism connected with the pinion of the steering engine, and a power-assisted motor connected with the turbine worm retarding mechanism; the ECU further receives the signal of the steering wheel torque measured by the steering wheel torque sensor and the speed signal acquired by a CAN bus so as to perform the steering system assistance and the return control as well as implement the electrically-assisted steering function. The system can improve the operation stability of the whole vehicle according to the operation condition of the vehicle, improve the road-feel of drivers, and ensure the vehicle to have stronger returnability.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Energy storage device system for primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology

An energy storage device system for a primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology comprises a power generation set, a transformer, a power grid, a DC-AC converter and energy storage battery packs and is characterized in that a multi-port DC-DC converter is also arranged, so that connection ports of a plurality of energy storage battery packs are connected with respective port of the DC-DC converter, and at least one supercapacitor is also connected with the respective port of the DC-DC converter; and moreover, a load allocation system is used for receiving a dispatched AGC instruction or forming a load instruction according to a frequency of the power grid, the instruction is divided into two paths, one path passes through an energy management system to be connected with the multi-port DC-DC converter and the DC-AC converter, and the other path is connected with a distributed control system (DCS) and digital electric hydraulic (DEH) control system of the generation set to control the power generation set to work. Therefore, the peak load regulation capability of a power system can be improved, the primary frequency regulation ability and the AGC response capability of a coal-fired unit are improved, the stable running of a power plant is ensured, and energy is saved.
Owner:ZHEJIANG OCEAN UNIV

FPGA (field programmable gate array) based digital AGC (automatic gain control) system and method of ultra-short wave radio set

The invention relates to a FPGA (field programmable gate array) based digital AGC (automatic gain control) system and method of an ultra-short wave radio set. An RF (radio frequency signal) IN of a receiver is sent to a digital attenuator I to achieve an IF (intermediate frequency) signal through a mixer. One part of the IF signal enters a digital attenuator II, and the other part of the IF signal enters a detector for the detection. An IF-RSSI (received signal strength indicator), received by the detector, is converted into a digital signal by an A/D (analog/digital) converter and entered the FPGA. The signal processing is performed to the FPGA by adopting the sliding window smoothing algorithm to acquire average value of the IF signal. The FPGA judges according to the IF-RSSI. The digital attenuator I and the digital attenuator II are controlled through RFAGC (radio frequency automatic gain control), IFAGC 1(intermediate frequency automatic gain control) and IFAGC2, and a variable gain amplifier is controlled through an SPI interface to achieve constant output of the IF signal. By the use of the FPGA-based digital AGC system and method, automatic gain control on the RF signal reception is achieved within a wide dynamic range, thus the IF signal is maintained within a stable range, and smooth output of the IF signal is realized.
Owner:TIANJIN 712 COMM & BROADCASTING CO LTD

Primary frequency modulation adjusting performance determination method of generating set

The invention discloses a primary frequency modulation adjusting performance determination method of a generating set, and determination of primary frequency modulation adjusting performance is carried out on the generating set with automatic generating control. An improved additional weight integration electric quantity algorithm is provided in the invention, according to real contribution degree of primary frequency modulation to an electrical network, different weight coefficients are employed to carry out integration contribution electric quantity calculation on different frequency differences or time quanta in large and small frequency disturbances, thus primary frequency modulation motions of different generating sets can be distinguished scientifically, a correct rate and contribution electric quantity of the primary frequency modulation motion can be taken into consideration comprehensively to calculate deserved primary frequency modulation economy compensation, and through carrying out verification with real-time measurement data, the novel performance determination method is completely operable. An instance in the invention shows that the additional weight integration electric quantity algorithm has rationality compared with a common integration electric quantity algorithm.
Owner:NORTHWEST CHINA GRID

Automatic gain control (AGG) self-excited oscillation driving circuit of micro-solid modal gyroscope

The invention discloses an automatic gain control (AGG) self-excited oscillation driving circuit of a micro-solid modal gyroscope, which comprises an oscillation circuit formed by five parts including a charge amplifier, a phase shifter, an amplifier, a band-pass filter and an automatic gain controller, wherein a gyroscope vibration signal is firstly received and enhanced by the charge amplifier, and then phase adjustment is carried out on a signal output by the charge amplifier by the phase shifter, so that the self-excited oscillation condition of a closed loop drive circuit can be met; the signal is amplified by the amplifier, and then frequency-selecting is carried out on the amplified signal by the band-pass filter; after passing through the band-pass filter, the signal enters the automatic gain controller; the automatic gain controller is used for controlling gain according to the difference value between the obtained signal amplitude value and reference signal amplitude value; and finally, a sine driving signal with constant amplitude and stable frequency can be obtained, and a whole closed loop drive system is ensured to be stable. The AGG self-excited oscillation driving circuit can be used for providing the driving signal with constant amplitude and stable frequency to the micro-solid modal gyroscope, so that the problems of the existing closed loop drive circuit can be solved.
Owner:SHANGHAI JIAO TONG UNIV

Method for simulating and analyzing automatic generation control of electrical power system containing wind power

ActiveCN102751737AEarly warning of risks to safe and stable operationSingle network parallel feeding arrangementsWind energy generationSimulationPerformance index
The invention provides a method for simulating and analyzing automatic generation control of an electrical power system containing wind power. The method comprises the following steps of building a power grid model to which the wind power is connected, building a simulation platform external interface model, performing formatting processing to data changing with time in a power grid and inputting the data into the simulation platform external interface model, setting a simulation parameter and performing dynamic operation simulation, building a control performance index assessing and analyzing model, preserving and processing result data to a control performance index. The method is used for studying impact analysis of wind power connection to power grid dynamic frequency modulation, the simulation time can be calculated from second level to hour level and higher than hour level, and monitoring variables include power system frequency, interconnection power, conventional generator set power, wind farm power and the like and are used for quantitatively analyzing influence on power grid frequency control performance under the conditions of different wind power and providing reasonable suggestions for adjustment of a control method of an automatic generation control system. The method facilitates in-advance early warning of safe and stable operation risks of the power system after large-scale wind power is connected to the power system.
Owner:CHINA ELECTRIC POWER RES INST +1

Primary frequency modulation and virtual inertia response control method and device for wind power plant station

The invention discloses a primary frequency modulation and virtual inertia response control method and device for a wind power plant station and belongs to the technical field of power grid frequency modulation. The wind power plant station comprises a wind turbine generator set and a centralized flywheel energy storage array system connected with the wind turbine generator set. The method comprises the following steps of: receiving instruction information issued by an automatic power generation control system, acquiring voltage, current and power grid frequency at the grid-connected point of the wind power plant station in real time; and controlling the wind turbine generator set and the centralized flywheel energy storage array system to perform primary frequency modulation or virtual inertia response according to the voltage, the current, the power grid frequency and the frequency change rate corresponding to the power grid frequency. According to the method and device of the invention, the centralized flywheel energy storage array system is configured in the wind power plant station, and the centralized flywheel energy storage array system is controlled to charge and discharge to participate in the primary frequency and virtual inertia response of a power grid, so that the wind turbine generator set has primary frequency modulation and inertia response capabilities under full-working-condition operation, and the stability and disturbance rejection of the wind turbine generator set are improved; and the operation economy of the wind power plant station is improved.
Owner:沈阳微控新能源技术有限公司
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