57 results about "Total frequency" patented technology

The invention, which belongs to the technical field of electromagnetic signal monitoring, relates to a rapid judgment method for a spatial spill electromagnetic signal, and the method specifically comprises the following steps: S1, receiving a spill electromagnetic signal in a space; s2, dividing the monitoring total frequency band into a plurality of sub-frequency bands with the same width, rapidly analyzing the obtained electromagnetic signal frequency spectrum in real time based on multi-scale spectrum entropy analysis, and positioning the frequency band where the characteristic signal is located; and S3, converting the frequency spectrum of the frequency band where the characteristic signal is located into a time domain signal, and simultaneously displaying a spectrogram and a time domain waveform. Through spectrum segmentation, multi-scale spectrum entropy analysis, adaptive threshold judgment and frequency domain-time domain combined display, the problems of poor real-time performance, weak anti-noise capability and single dimension in the prior art are solved.

The invention relates to the technical field of output sharing control, in particular to a multi-path power regulator control method and system, and the method comprises the following steps: collecting real-time data to establish a data queue, calculating a mean value and a standard deviation to generate a dynamic operation baseline, collecting the real-time data to establish the queue, calculating the mean value and the standard deviation to generate a dynamic baseline, the method comprises the following steps: calculating an adaptive over-current and open-phase alarm threshold based on a baseline, adding an external control quantity to obtain a total power demand, adjusting the number of cycles according to the stability of a load, reducing the number of active whole waves in proportion when the number exceeds the limit, and stopping a thyristor triggering instruction when the current or voltage abnormally and continuously reaches a preset count. According to the method, the self-adaptive threshold is calculated by establishing the dynamic operation base line in combination with the fluctuation amplitude and the sensitivity factor, current and voltage abnormity is specifically recognized, the total cycle number and the active whole wave number are adjusted in combination with the external power requirement and the load stability, single trigger angle control dependence is avoided, and power distribution balance and electric energy supply stability are achieved; and the equipment damage risk is reduced.

The invention discloses a hybrid energy storage frequency modulation optimization method and system based on dynamic response and SOC cooperation. The method comprises the steps that the frequency deviation of a power grid is detected; if the absolute value of the frequency deviation is greater than the absolute value of the threshold of the frequency modulation dead zone, determining the current frequency modulation stage according to the frequency deviation and calculating the total frequency modulation power of the current frequency modulation stage; if the absolute value of the total frequency modulation power is smaller than a specified value, adjusting a utilization factor of the fuel cell for frequency modulation until the output of the fuel cell reaches the absolute value of the total frequency modulation power; if the absolute value of the total frequency modulation power is greater than a specified value, adjusting a utilization rate factor of the fuel cell to perform frequency modulation, and adjusting a charge-discharge weight of the energy storage cell according to the charge state of the energy storage cell in real time to perform frequency modulation until the output of the fuel cell reaches the specified value; and the sum of the output of the fuel cell and the output of the energy storage cell reaches the absolute value of the total frequency modulation power. According to the invention, comprehensive optimization of frequency modulation response speed, economy and energy storage life is realized.

The invention relates to a low earth orbit satellite-oriented frequency offset estimation and compensation method, and belongs to the technical field of satellite communication. Aiming at the problems of failure of a traditional synchronization algorithm, complex calculation of a dual-state model, difficulty in parameter setting and the like caused by ultra-large frequency offset due to high-speed movement of a low-orbit satellite, the method comprises the following steps of: firstly, detecting integer frequency offset through cross-correlation of a received signal and a local PSS sequence and compensating the integer frequency offset; secondly, estimating decimal frequency offset by adopting a segmented correlation method; and finally, inputting the total frequency offset observation value into a single-state Kalman filter, and carrying out iterative correction by taking the known Doppler frequency offset change rate as a control quantity. The method has the technical effects that the synchronization stability in a low signal-to-noise ratio environment is remarkably improved, the system complexity is greatly reduced, the multi-parameter coupling problem is eliminated, the dynamic scene adaptability is enhanced, and a high-precision synchronization solution is provided for space-ground integrated communication.

The invention discloses a radio analog telephone communication encryption method, device and equipment and a medium, and the method comprises the steps: generating a frequency spectrum segment number and a pseudo-random sorting sequence through a preset encryption algorithm; and carrying out controllable segmentation on the total spectrum of the analog voice according to a continuous sequence from low frequency to high frequency, carrying out sequence recombination on each sub-spectrum according to a pseudo-random sequence, finally combining and outputting encrypted voice, and recovering the original voice by utilizing the same pseudo-random sequence reverse recombination at a receiving end. Therefore, the time-frequency continuity and statistical characteristics of the voice spectrum in the traditional radio analog communication are fundamentally changed. According to the method, frequency spectrums are recombined as a whole according to a pseudo-random rule, so that an eavesdropper can only obtain disordered voice signals after the frequency spectrums are rearranged even if the eavesdropper intercepts the signals, and the difficulty of passive cracking means such as frequency spectrum analysis, filtering reduction and voice recognition is remarkably increased; the problem that in the prior art, radio analog telephone communication is insufficient in encryption and easy to crack is solved.

The invention discloses a signal restoration method, device and system. The method comprises the following steps: receiving a signal processing request; in response to the signal processing request, segmenting the composite signal to obtain a plurality of signal blocks; converting to obtain a plurality of frequency domain signal blocks in a frequency domain; according to the symbol rates corresponding to the multiple signal types, determining signal interception numbers corresponding to the multiple signal types; according to a time sequence corresponding to the plurality of frequency domain signal blocks, sequentially carrying out interception processing on the plurality of frequency domain signal blocks to obtain frequency domain sub-signals respectively corresponding to the plurality of signal types until frequency domain total signals respectively corresponding to the plurality of signal types are obtained; converting to obtain a plurality of time domain total signals; and according to the time domain total signals corresponding to the multiple signal types, target restoration signals corresponding to the multiple signal types are determined. According to the method and the device, the technical problems that signal separation is difficult to accurately carry out and signal restoration accuracy exists due to the fact that signal interception parameters are difficult to flexibly configure in related technologies are solved.

The application discloses a flexible DC transmission line intra-zone and extra-zone fault discrimination method based on S transform, a method of waveform continuation is used to cover the subsequent wave with the wave tail of the first wave, the influence of the subsequent wave head on the frequency characteristics is reduced, the S transform is used to make the modulus time frequency matrix of the continued waveform, the row vectors of the modulus time frequency matrix are integrated, the corresponding amplitude-frequency curve is obtained, the energy operator is used to weight the amplitude-frequency curve to improve the proportion of high-frequency components, the energy accumulation of different frequency bands is constructed, the ratio of the high-frequency band energy accumulation and the total frequency band energy accumulation is taken as the intra-zone and extra-zone fault recognition criterion, when the ratio is greater than the threshold value, the intra-zone fault is determined, otherwise, the extra-zone fault is determined. The method meets the rapidity requirement of the flexible DC transmission line protection, has high sensitivity, and has important reference value for the development of the flexible DC transmission protection.

The application discloses a power distribution network communication fault type identification method and device, electronic equipment and storage medium, the method comprises the following steps: obtaining the voltage mode time-frequency matrix before and after the occurrence of the power distribution network communication fault, extracting the voltage fundamental wave amplitude, the voltage main harmonic amplitude and the voltage main harmonic amplitude frequency before and after the occurrence of the communication fault; obtaining the current mode time-frequency matrix before and after the occurrence of the power distribution network communication fault, extracting the current direct current amplitude, the current main harmonic amplitude, the current main harmonic amplitude frequency and the current total frequency band amplitude before and after the occurrence of the communication fault; based on the above parameters, a criterion is constructed to determine whether the power distribution network communication fault type is a lightning flashover communication fault or an insulator pollution flashover communication fault. Through the implementation of the application, the lightning flashover communication fault and the insulator pollution flashover communication fault in the power distribution network can be effectively identified, thereby significantly improving the operation reliability of the power distribution network and ensuring the safe and stable operation of the power system.

The invention discloses a method and a system for constructing a collision-zone-free frequency hopping sequence set in a '1 + M' form, and mainly solves the problems that in the prior art, frequency point collision is generated when time delay deviation is large, and new collision is introduced in a secondary mapping or expansion process. The implementation scheme of the method comprises the following steps: generating two frequency hopping sequence set sums with different collision-free regions by adopting a collision-free region construction method; combining the two sequence sets to obtain 1 + M frequency hopping sequences; segmenting 1 + M frequency hopping sequences according to a set length to obtain sequence segments of the first sequence; setting random numbers which are uniformly distributed between 0 and 1, and constructing a zeroth dynamic frequency slot set and a first dynamic frequency slot set by utilizing the sum of the frequency slot sets, the size of the total frequency slot set and the sum of frequency slot elements in the total frequency slot set; and performing frequency slot mapping by using the sum sequence segment to obtain a collision-zone-free frequency hopping sequence set consisting of 1 + M frequency hopping sequences. According to the method, effective expansion of the collision-free area can be realized while the consistency of the sequence structure is kept, and the method can be used for orthogonal frequency hopping networking when the relative time delay difference between users is relatively large.

Method for exciting one or more, preferably piezoelectric, transducers (7), which transducers (7) are designed to generate sound waves and have operating frequencies which define a converter frequency range, in which a generator (9) which has an electrical connection (8) to the converters (7) and a frequency sweep function for generating an electrical excitation signal with a variable excitation frequency (1) generates an electrical excitation signal for the converters (7), which excitation signal is supplied to the converters (7), wherein the generator (9) with an adjustable sweep rate performs a total number of frequency sweeps in a frequency sweep range between a minimum frequency (f min ) and a maximum frequency (f max ) carries out, within which frequency sweep range a target frequency (f Ziel ) is defined, characterized by the fact that the minimum frequency (f min ), the maximum frequency (f max ) and the target frequency (f Ziel ) are chosen such that a first frequency difference (Δf1) exists between the minimum frequency (f min ) and the target frequency (f Ziel ) during a first number of frequency sweeps from the total number of frequency sweeps, preferably during substantially all frequency sweeps, in magnitude from a second frequency difference (Δf2) between the maximum frequency (f max ) and the target frequency (f Ziel ) differs, and where the minimum frequency (f min ) and / or the maximum frequency (f max ) and / or the target frequency (f Ziel) is modified after at least one frequency sweep such that an arithmetic mean of the first frequency differences (Δf1) and an arithmetic mean of the second frequency differences (Δf2) formed over all frequency sweeps are essentially equal in magnitude.

The application relates to the technical field of AD sampling, and discloses a fast high-precision AD sampling method based on statistics, an AD sampling device and a storage medium, the method comprising the following steps: acquiring sampling data; counting N AD sampling values with the highest sampling frequency ranking in the sampling data; combining X AD sampling values adjacent to each AD sampling value in the N AD sampling values into a group of data to form a plurality of groups of data; accumulating effective sampling frequencies in the plurality of groups of data to obtain a plurality of total frequencies; and taking an AD sampling value located at a middle position in a group with the maximum frequency among the plurality of total frequencies as a sampling result. The AD sampling value obtained by the method is relatively stable, the system stability can be ensured by using the calculation mode in medium-scale sampling, the calculation amount is small, the anti-interference capability is good, and the output result is more accurate.

The present invention discloses a sea clutter suppression method based on time-frequency spectrum energy distribution and singular value decomposition, comprising: performing STFT on the echo signal to obtain a time-frequency spectrum, calculating the instantaneous energy of each time-frequency point; equally dividing the frequency interval of the time-frequency spectrum, calculating the energy proportion of the frequency subinterval to the total frequency interval at each time point; for each time point, selecting the amplitude mean of the frequency subinterval with the largest energy proportion as the filtering threshold, and filtering the time-frequency point at that time point using the threshold; performing an inverse short-time Fourier transform on the filtered time-frequency spectrum, and performing singular value decomposition on the obtained echo signal matrix; selecting a singular value set representing the clutter from the singular value decomposition result, and constructing a signal subspace matrix based on the singular value set; projecting the echo signal matrix onto the signal subspace matrix to obtain the echo signal after clutter suppression. The present invention achieves effective sea clutter suppression in a strong sea clutter environment, improving the radar's detection capability for weak targets.

The application provides a non-destructive size measurement method for underground targets by combining frequency coding and half-integer phase control, and belongs to the field of non-destructive size measurement of underground targets. The method solves the problem that the prior art cannot effectively overcome the near distance blind area and suppress the frequency domain sidelobe. The method comprises the following steps: constructing an equal-interval frequency grid; generating a transmission frequency sequence by using a step parameter coprime with the total frequency point number for coding sorting; defining the effective transmission duration of each frequency point time slot, so that the near distance blind area range is determined by meeting the half-integer period condition; in each frequency point time slot, a linear sweep signal is generated, and the cumulative phase of the signal at the end of the time slot is controlled to meet the half-integer circle constraint; the signal is transmitted in sequence, and the echo signal is received synchronously; the complex frequency response of each frequency point is extracted, and after frequency domain coherent synthesis, the phase information is differentially approximated to obtain the group time delay; and the target geometric size is calculated according to the medium propagation speed and the group time delay. The method is used in the field of pipe network detection.

The invention discloses a method for automatically measuring impedance of a power electronic converter based on a real-time simulation platform, which comprises the following steps of: adding a disturbance injection module and a data acquisition module into a simulation model, and calculating load flow or performing time domain simulation to obtain a steady-state working point; parameters needing to be measured are determined in the disturbance injection module; according to the measurement starting time, the wave recording starting time, the real-time simulation step length, the sampling factor, the storage file size and the storage file of a data acquisition module in the real-time simulation platform are determined, and according to the measurement starting time, the frequency disturbance duration of each time, the disturbance interval waiting time and the total frequency number of the frequency sequence, the real-time simulation total duration is determined; injecting disturbance, and acquiring a voltage and current data set of the tested port; and calculating the impedance value of the total frequency number of the frequency sequence, and generating a full-band impedance characteristic curve. According to the measurement method disclosed by the invention, the impedance scanning efficiency is improved, and the impedance of the new energy equipment is quickly and accurately acquired.

The embodiment of the invention provides a calling retry method, device and equipment and a computer storage medium, the calling retry method is applied to a calling party, and the calling retry method comprises the steps that the number of calling failures is determined; the calling failure frequency represents the total frequency of calling failure of the called party; determining retry interval time according to the calling failure times and the random factor; and recalling the called party according to the retry interval time. Therefore, due to the fact that the random factor is introduced when the retry interval time is calculated, the randomness of the retry interval time is increased, instantaneous pulse type impact on the called party is avoided, and the success rate of retry is increased.

The invention is a kind of wind farm droop control frequency modulation method with pitch angle protection function, wind farm control center receives the load shedding mode and adjustable power of wind turbine; the wind turbine is divided into two groups by whether to use pitch angle load shedding, and the total frequency modulation power of the wind farm and the two groups is calculated according to the calculation; the control center determines the total droop coefficient of the wind farm according to the total adjustable power of the wind farm; the total droop coefficient of the two groups is determined according to the adjustable power of the two groups, and the relationship between the frequency modulation participation rate ρ and σ and the maximum adjustable frequency modulation power of G1, G2 and the maximum adjustable frequency modulation power of the wind farm is calculated; the droop coefficient of the wind turbine is determined according to the adjustable power of the wind turbine, and it is sent to each wind turbine; finally, the wind turbine adjusts the droop coefficient in real time according to the received information, and completes the frequency modulation work. The invention preferentially makes the wind turbine without pitch angle load shedding to perform frequency modulation, reduces the pitch angle action amplitude and frequency of the wind turbine with pitch angle load shedding, protects the mechanical device of the wind turbine, and prolongs the service life of the wind turbine.

This invention proposes an adaptive collaborative frequency regulation method and system for ship-to-shore power systems based on panoramic perception, relating to the field of collaborative control technology between ship-to-shore power and power systems. The key technical points of this invention include: collecting multi-source heterogeneous operating status data from the ship, port, and power grid; constructing a fused state variable set after preprocessing the multi-source heterogeneous operating status data; determining whether frequency regulation is needed based on the fused state variables; if frequency regulation is needed, calculating the total frequency regulation demand of the ship-to-shore power system based on the fused state variable set; establishing an objective function with the optimization goal of minimizing frequency deviation and power fluctuation, solving it under constraints, and optimally allocating the total frequency regulation demand to the ship, port, and power grid layers. This invention significantly improves the observability of the shore power system status, increases response speed, alleviates the pressure on single frequency regulation resources, and improves the stability of the frequency recovery process. This invention can be integrated and deployed based on existing monitoring devices, energy storage converters, and shore power control platforms, facilitating implementation in port areas.

The invention discloses a transmitting and receiving end multi-resource power distribution method for optimizing a frequency modulation power distribution coefficient, and belongs to the technical field of power system frequency control. The method comprises the following steps: acquiring various frequency modulation resource parameters, and establishing a transmitting-receiving end power system frequency response mathematical model; constructing a target function and a frequency security constraint condition which take the minimum total frequency modulation cost as a target; establishing a particle swarm optimization model, and taking a target function as a fitness function; iteratively optimizing a frequency modulation distribution coefficient in combination with a particle swarm algorithm and transient simulation; and generating a distribution instruction according to the optimal coefficient. According to the method, the adjustable frequency modulation distribution coefficient is introduced, and the transmitting and receiving end coupling characteristics, the multi-resource cost difference and the transient safety index are considered, so that multi-resource cooperative frequency modulation is realized. An application result shows that the frequency modulation cost of the system is reduced by 2.61%, the frequency stability is remarkably improved, a new energy high-proportion grid-connected scene is adapted, and the defects of a traditional distribution mode are overcome.

The invention discloses a cooperative control method and system for a new energy unit and a station to participate in primary frequency modulation. Establishing a primary frequency modulation model of the new energy power supply based on the unit model of the new energy power supply, a frequency controller link and a configured load shedding operation algorithm; according to the output power variation of the new energy power supply, the output power variation of the traditional power supply and the load demand, calculating the frequency deviation of the power system; under the load shedding operation condition, the effective wind speed, the rotor kinetic energy reserve and the power reserve index of each unit are collected in real time, the standardization score of each unit is calculated, an entropy weight method and a variable coefficient method are combined for weighting, and the frequency modulation potential comprehensive score of each unit is calculated; and determining the total frequency modulation power demand of the new energy station based on the power grid frequency deviation, and calculating the frequency modulation responsibility proportion and responsibility power of each unit in real time through a dynamic weight distribution algorithm in combination with the frequency modulation potential comprehensive score.

Provided are a method and device for transmitting information, the method for transmitting information comprising: a first terminal device determining a first resource for transmitting information, so that a total frequency range corresponding to the first resource and a first control resource set on a frequency domain is less than or equal to a maximum channel bandwidth supported by the first terminal device; the first terminal device transmits information in the first resource, thereby solving the problem of frequent switching of the working frequency in the network access process of the communication device, effectively saving the power consumption of the communication device, and improving the flexibility of information transmission.

The invention provides a satellite multi-beam resource scheduling method based on reserved groups, which comprises the following steps of: dividing available total frequency carrier resources of a satellite communication system into reserved frequency resource groups and flexible frequency resource groups, and allocating non-overlapped frequency bands for the divided groups to realize frequency isolation; dynamically determining the number of channels which should be occupied by the reserved frequency resource group according to the historical traffic data of each beam; for a received new user access request, allocating resources of the used beam in the reserved frequency resource group; and if the reserved frequency resource group cannot meet all the access requests, transferring the remaining requests which cannot meet all the access requests to the flexible frequency resource group for resource allocation. The invention further provides a satellite multi-beam resource scheduling system based on the reserved grouping. Therefore, the resource scheduling complexity can be remarkably reduced, the system resource utilization rate and the operation stability are improved, and flexible and efficient on-demand allocation is realized.

The embodiment of the invention relates to the technical field of load distribution, in particular to a load distribution method and system for multiple thermoelectric conversion units and a data display system. In the load distribution method, an objective function in a load distribution model relates to optimal operation deviation total amount data, total energy consumption data, load adjustment total frequency data and load adjustment direction change total frequency data. The constraint condition information in the load distribution model includes that the sum of the distribution loads corresponding to the thermoelectric conversion units in each time period in the future is equal to the total load corresponding to the time period, and the distribution load of each thermoelectric conversion unit in each time period in the future does not exceed the limit load range of the thermoelectric conversion unit. According to the method, on the premise that the total load requirements corresponding to multiple time periods in the future are met, the overall operation energy consumption factor and the unit operation life factor are comprehensively considered, so that a load distribution scheme is reasonably formulated, and then dynamic and reasonable adjustment on the load of the thermoelectric unit is dynamically and reasonably adjusted subsequently.

This application provides a communication method and related apparatus. The method includes: generating a trigger frame; the trigger frame includes user information fields corresponding to one or more users, the one or more users including a first user using joint source channel coding; the first user corresponds to multiple user information fields, one user information field corresponding to the first user is used to indicate the first user's layer frequency domain resources in one source layer; or, the first user corresponds to one user information field, the one user information field corresponding to the first user is used to indicate the first user's total frequency domain resources in all source layers; sending the trigger frame to receive trigger-based physical layer protocol data units from the first user, the trigger-based physical layer protocol data units including jointly source channel coded data located in the first user's layer frequency domain resources, thereby realizing joint source channel coded transmission based on the trigger frame.

There are provided measures for efficient utilization of spectrum extension resources. Such measures exemplarily comprise: generating an uplink signal, where the uplink signal is a spectrally spread signal corresponding to a total frequency band allocation comprising an in-band portion and at least one out-of-band portion, where the at least one out-of-band portion corresponds to the spectral spread; and transmitting the uplink signal, and in relation to the generation, such measures exemplarily comprise: dividing a data stream to be transmitted into a first data substream and a second data substream; modulating a symbol of the uplink signal based on the first data substream; arranging the symbols in the in-band portion; copying the symbols arranged in at least one predetermined sub-portion of the in-band portion to the at least one out-of-band portion; determining a first state subcarrier of the total band allocation and a second state subcarrier of the total band allocation based on the second data substream, wherein a first subset of the second state subcarriers is located in the at least one out-of-band portion; and modifying the symbols arranged on the second state subcarrier.

The invention discloses a frequency modulation equipment capability evaluation method and device based on an energy visual angle. The method comprises the following steps: acquiring equipment parameters, network parameters and preset fault information of a system, and initializing equivalent speed regulator model parameters by aggregating the equipment parameters; based on the equivalent speed regulator model parameters, the network parameters and preset fault information, establishing a vibration mechanical model of the power system; solving the vibration mechanical model according to a modal analysis method, and obtaining a common-mode component and an oscillation component of the frequency variation of the power system; determining the frequency variation of each unit in the power system according to the common-mode component and the oscillation component; according to the frequency variation and the equivalent speed regulator model parameters, calculating the total unit frequency modulation energy accumulated at the maximum frequency deviation moment of each unit; and calculating the frequency modulation capability contribution degree of each unit based on the total frequency modulation energy of each unit, and outputting a frequency modulation capability evaluation conclusion of each unit according to the frequency modulation capability contribution degree of each unit.

The invention discloses a time-frequency synchronization method and system for orthogonal frequency division multiplexing transmission of an unmanned aerial vehicle, and belongs to the field of communication. The method comprises the steps of obtaining a baseband receiving signal transmitted by an unmanned aerial vehicle end; the baseband receiving signal is generated according to a superposed signal generated by a pseudo-random noise sequence and a preset power distribution factor; generating a synchronization function according to the baseband receiving signal and a preset local time domain training sequence; performing coarse estimation on the phase difference between the cyclic prefix and the symbol main body according to the symbol starting point at the moment when the peak value of the synchronization function exceeds the preset threshold value to obtain coarse estimation frequency offset, performing coarse compensation correction on the baseband receiving signal, and performing fine estimation on the subcarrier phase rotation amount by the baseband receiving signal after coarse compensation to obtain fine estimation frequency offset; and performing frequency offset correction on the baseband receiving signal according to the total frequency offset obtained by adding the coarse estimation frequency offset and the fine estimation frequency offset. According to the invention, the problem that broadband offset coverage and high synchronization precision cannot be satisfied simultaneously in the prior art is solved.

The application discloses a kind of impedance automation measurement methods of power electronic converter based on real-time simulation platform, including in simulation model, disturbance injection module, data acquisition module, computing flow or time-domain simulation obtains steady state operating point;In disturbance injection module, the parameter that needs to be measured is determined;According to the starting time of measurement, the starting time of the recording wave of data acquisition module in real-time simulation platform, real-time simulation step, sampling factor, storage file size and storage file are determined, and according to the starting time of measurement, the duration of each frequency disturbance, disturbance interval waiting time, the total frequency number of frequency sequence, the total duration of real-time simulation is determined;Injection disturbance, and the voltage and current data set of measured port are obtained;The total frequency number of frequency sequence is calculated impedance value, and full-band impedance characteristic curve is generated.According to the measurement method disclosed in the application, the impedance scanning efficiency is improved, and the new energy equipment impedance is quickly and accurately obtained.

A cryogenic amplification device (1) is according to the invention configured to include at least two parallel parametric amplification lines (7, 8) to thereby enable reduction of gain ripples in the total frequency spectrum of the amplifier bandwidth.

The invention relates to a primary frequency modulation method and system for fusion of a hydropower station and an energy storage power plant, and aims to overcome the defects of slow response and limited regulation capacity during independent frequency modulation of the hydropower station. The power grid frequency is collected in real time, a total frequency modulation output instruction is generated, real-time operation parameters of a hydropower station and an energy storage power plant are obtained, the total instruction is dynamically decomposed into a hydropower station sub-instruction and an energy storage sub-instruction based on a preset collaborative distribution strategy, output increasing and decreasing requirements are distinguished, and the energy storage charge state is combined. Energy storage is preferentially utilized to realize rapid initial response, then the hydropower station provides continuous support, meanwhile, the output proportion is dynamically adjusted according to the operation states of the two parties, and an optimization cooperation strategy is fed back by continuously monitoring the actual frequency modulation performance and comparing the actual frequency modulation performance with an assessment index. According to the invention, advantage complementation of two kinds of resources is realized, and the response speed, the capacity guarantee capability and the adaptability to power grid examination requirements of combined frequency modulation are improved.