488 results about "Differential protection" patented technology

The invention discloses a transformer fault intelligent diagnosis method and system, and the method comprises the steps: reading a longitudinal differential protection action switching value from transformer fault recording, according to the fault recording information, calculating rated current of each side of the transformer, longitudinal three-phase differential current amplitude, voltage and current amplitude of each side and zero-sequence voltage and zero-sequence current amplitude of each side; and combining different criteria to intelligently identify fault types such as a non-internal fault, a three-phase symmetric fault, a single-phase earth fault, a two-phase earth fault, a two-phase interphase short circuit and an interturn fault of the transformer, and fault sides and fault phases. According to the invention, the fault type and the fault position of the transformer can be rapidly and automatically positioned, manual fault analysis is assisted or replaced, and an intelligent automatic solution is provided for accident handling of the transformer fault in an engineering field.

The invention relates to the technical field of power system power distribution network protection, in particular to a self-adaptive current differential protection method for a power distribution network with branch loads. Firstly, current data acquisition is carried out, intelligent electric meters are installed at power distribution network nodes, and timestamps are synchronized. Current phasor estimation is carried out, and the current phasor of each node is obtained through data preprocessing, soft threshold processing, wavelet reconstruction and phasor estimation; then, differential current is calculated, and the vector difference between adjacent nodes is determined; and determining an adaptive threshold according to historical fault data and real-time power grid load. The fault is judged by comparing the differential current with a threshold value, and the fault type is recognized by adopting a mode recognition algorithm. And finally, generating a protection decision based on a result, and taking measures of cutting off branches, selecting a protection mode according to a resistor, adjusting load distribution or limiting current and the like for short circuit, grounding, overload and other faults to improve fault detection accuracy, accurately identify fault types, reasonably generate and execute the protection decision and guarantee safe and stable operation of the power distribution network.

The invention discloses a phase-adjustable large-current generator, and the generator comprises a main circuit module, and a topological structure of the main circuit module employs a multi-stage IGBT inverter; the phase control module inputs a power grid voltage signal through a voltage transformer, adopts an SOGI-PLL structure to improve signal tracking precision, and combines a virtual synchronous machine technology to enhance system balance and a self-adaptive control strategy to dynamically adjust an output signal so as to realize phase control and synchronization; the electromagnetic compatibility optimization module adopts a layered shielding design and is combined with an optical fiber to transmit a control signal, so that the electromagnetic compatibility of equipment is improved; a relay protection test integration module, wherein the relay protection test integration module comprises a differential protection test mode and a distance protection test mode; according to the invention, the problems of low phase adjustment precision, poor synchronization stability and insufficient electromagnetic compatibility of a large current generator in a new energy grid-connected environment are solved.

The invention provides a power distribution network differential protection data compression method, device and equipment and a medium, and the method comprises the steps: obtaining the sampling data of a power distribution network, carrying out the feature classification of the sampling data at an edge node of the power distribution network according to the protection demands, and obtaining a fundamental current vector, high-frequency transient energy and an accurate timestamp; acquiring a real-time network bandwidth and a fault risk assessment result of the power distribution network, and selecting a compression mode according to the real-time network bandwidth and the fault risk assessment result; according to a compression mode, sequentially carrying out characteristic grading compression on the fundamental wave current vector, the high-frequency transient energy and the precise timestamp to obtain a characteristic data packet of the power distribution network; and transmitting the characteristic data packet to the master station side module through a hybrid communication network. The sampling data is divided into the fundamental component, the high-frequency transient component and the precise timestamp, the compression priority is distributed according to the differential protection requirement, the performance bottleneck caused by the fixed compression rate is broken through, and the redundant data volume during differential data compression is effectively reduced.

The invention discloses a DTW algorithm-based distribution line current differential protection method, relates to the technical field of power distribution network relay protection, and aims to solve the problems that the III-section type overcurrent protection performance is reduced and the optical fiber communication cost is high after a distributed power supply is connected. According to the method, a 5G communication technology, a five-point numerical differential algorithm, amplitude limiting average filtering and a DTW similarity distance algorithm are fused, and current differential protection is achieved; the method comprises the steps of collecting three-phase current on two sides of a line in real time, starting a criterion through a fault current change rate, suppressing noise through amplitude-limiting average filtering, and normalizing data; the core is that the current sequence similarity is calculated by using a DTW algorithm, and a fault is accurately judged; according to the method, the influence of 5G communication time delay is eliminated, and the reliability of distribution network protection and control is improved; meanwhile, optical fibers are replaced by 5G, so that the cost is greatly reduced, the economical efficiency of distribution network protection is improved, and popularization and application are facilitated; the innovative technology provides powerful support for intelligent upgrading and sustainable development of a power distribution network.

The invention discloses a differential protection method and system for a single-core phase-shifting transformer, and the method comprises the steps: respectively calculating first balance coefficients of a series winding system side and a load side and a first balance coefficient of an excitation winding through employing the current of the excitation winding as a criterion and employing the current of the series winding system side and the load side; respectively calculating a second balance coefficient of the system side of the series winding and a second balance coefficient of the exciting winding by using the phase modulation gear data, the transformation ratio of the current transformer of the system side of the series winding and the transformation ratio of the current transformer of the exciting winding; correcting the series winding system side current and the excitation winding current by using the first balance coefficient and the second balance coefficient so as to calculate a magnetic balance differential current; correcting the series winding system side current, the series winding load side current and the excitation winding current by using a first balance coefficient so as to calculate an electric balance differential current; when the magnetic balance differential current and the electric balance differential current are both larger than the braking current, differential protection acts, and differential protection of the single-core phase-shifting transformer is achieved.

A protection method for a voltage flexible control circuit applied to a photovoltaic power station comprises the steps that a multi-layer electrical signal fusion criterion system comprising an abnormal working condition triggering layer, a fault area recognition layer and a fault type judgment layer is constructed, firstly, overcurrent and overvoltage signals are collected through the abnormal working condition triggering layer, and protection logic starting is triggered; the fault area identification layer is used for distinguishing whether the fault exists inside or outside the AC-DC-AC converter; and finally, the fault type judgment layer is used for accurately identifying the faults of the AC-DC-AC converter, the series coupling transformer, the line and the far-end line. By introducing differential protection action chains and hierarchical response mechanisms corresponding to different fault types, accurate isolation of a fault area is realized, and meanwhile, the problems of system mistaken switching and excessive protection caused by extensive protection actions are effectively prevented.

The invention provides a method for suppressing internal misfire caused by turn-to-turn short circuit of a dry-type air-core reactor, and belongs to the technical field of dry-type air-core reactors. A turn-to-turn short circuit fault detection device combining differential protection and infrared thermal image detection is established to form a three-dimensional turn-to-turn short circuit feature vector, a four-dimensional internal misfire minimum ignition vector is obtained, and a fire development prediction model is established based on an Arrhenius equation. A double-layer game model for minimizing the upper-layer fire loss and minimizing the lower-layer fire extinguishing cost is constructed to optimize five-dimensional suppression vector parameters, and coordinated actions of suppression equipment such as power-off protection, forced ventilation, temperature suppression and inert gas release are controlled in real time through a suppression vector parameter adjustment function. The technical problem of fire suppression measure starting lag or excessive response caused by difficulty in accurately predicting the opportunity and degree of development of the turn-to-turn short circuit fault of the dry-type air-core reactor into the internal fire disaster is solved.

The invention relates to the technical field of direct-current power transmission systems, in particular to an offshore wind power direct-current line differential protection method, device and system. The method comprises the following steps: respectively acquiring a first target current and a second target current at two ends of a direct-current submarine cable, and acquiring a direct-current voltage absolute value and a target voltage setting value at one end of the direct-current submarine cable; determining a current threshold value according to the first target current, the second target current and a preset protection threshold value; calculating a difference value between the first target current and the second target current; when the absolute value of the difference value is larger than the current threshold value, first delay time is calculated; when the absolute value of the direct-current voltage is larger than the target voltage setting value, second delay time is calculated; when the first delay time reaches the first preset time and the second delay time reaches the second preset time, differential protection is started, and the problem that an existing direct-current submarine cable differential protection method is low in reliability is solved.

The invention relates to a differential protection closed-loop simulation method based on a high-performance full-electromagnetic transient simulation platform. The method comprises the steps of model construction, data interaction, closed-loop simulation and performance evaluation. According to the method, modeling is carried out based on a Cloud PSS platform, and full electromagnetic transient elements of a primary model and a secondary model can be considered. Under the background that differential protection of a novel power system and a new-generation ship power supply system faces an adaptability problem, the method can comprehensively and efficiently establish a differential protection closed-loop simulation model, and detailed description of differential protection action performance is achieved; according to the scheme, the influence of primary model modeling granularity on differential protection is fully considered, and accurate description and evaluation of the differential protection adaptability problem under the background of a novel power system and a novel ship power supply system can be realized.

According to the power distribution network weighted current differential protection method based on distributed photovoltaic fault current regulation and control, voltage and current signals on the two sides of a power distribution network line are collected in real time, and through fine signal processing steps including filtering, Fourier transform and sequence component decomposition, accurate recognition of fault current and rapid judgment of the fault direction are achieved; by adjusting the current reference value of the inverter, the distribution coefficients of the positive and negative sequence current are equal, and the influence of the negative sequence current on the protection performance is effectively eliminated; the Bergeron model is utilized to accurately deduce the current, the synchronization error is considered to perform weighting processing, and the weighting processing and the local actually measured current jointly form a weighting differential protection criterion, so that the selectivity and the reliability of the power distribution network protection are remarkably improved, and the correctness and the quickness of the protection action can also be ensured under the distributed photovoltaic high permeability; the problem that a traditional protection method is insufficient in protection selectivity in the distributed photovoltaic power distribution network is solved, and powerful technical support is provided for safe and stable operation of the power distribution network.

The invention discloses an improved flexible direct current fault control method for improving current differential protection adaptability, and belongs to the technical field of power system relay protection and new energy power generation system grid-connected control. The method comprises the following steps: detecting a voltage drop abrupt change signal and a negative sequence voltage signal of a flexible DC output end, and starting a control strategy when the signals are satisfied; detecting a terminal voltage signal and active power of a new energy sending-out terminal, and calculating a new energy side current phase angle and a power angle; calculating a flexible DC side current phase angle control value and a negative sequence dq axis current reference value based on the parameters; and controlling the flexible DC side to output a negative-sequence current corresponding to the negative-sequence dq-axis current reference value, so as to actively adjust the current phase of the flexible DC side, reduce the phase angle difference between the fault current of the flexible DC side and the fault current of the new energy side, and discriminate the internal and external faults of the region through traditional current differential protection. According to the invention, the degree of freedom is controlled and the current phase is adjusted by using the flexible direct-current side negative-sequence current to reduce the phase angle difference of the two sides, so that the problem that the current differential protection adaptability in the double-end weak feedback system is reduced is solved, additional hardware is not needed, and the power grid safety and the new energy stable grid connection are ensured.

The invention discloses a protection control method for a differential mechanism of a pure electric vehicle, which relates to the technical field of electric vehicle driving, and comprises the following steps: acquiring wheel speed signals of wheels on two sides of a vehicle driving shaft, and calculating the rotating speed difference of the wheels on two sides; according to the rotating speed difference, a protection torque upper limit value and a protection torque lower limit value under the current rotating speed are determined through a preset rotating speed and protection torque threshold value mapping table; judging whether the motor request torque exceeds the upper limit value or the lower limit value of the protection torque; if the time exceeds the preset activation delay time, activating the differential protection function; and in the state that the differential protection function is activated, the actual output torque is controlled to be between the protection torque upper limit value and the protection torque lower limit value. Abnormal abrasion or impact damage of internal elements of the differential mechanism caused by excessive slip of a single-side wheel can be effectively avoided, so that the service life of the differential mechanism is greatly prolonged, the maintenance cost is reduced, and intense driving control and power requirements are met.

The utility model relates to the technical field of intelligent power distribution, and especially relates to an Internet of Things feeder terminal device. The Internet of Things feeder terminal equipment adopts a dual-system core board, adopts a dual-core heterogeneous core scheme of a real-time core and a non-real-time core according to the real-time and non-real-time requirements of medium-voltage distribution network service data processing, supports multi-service identification processing, and is widely applied to Internet of Things transformation and upgrading of various medium-voltage distribution equipment. Through a built-in 5G communication module, point-to-point communication between devices is realized, millisecond-level data transmission is supported, low delay and reliability of data transmission are ensured, and a scheme of in-situ rapid fault isolation such as differential protection is realized. The device also supports an MQTT Internet of Things protocol, can realize edge calculation, has the characteristics of hardware platformization, software APP, software development interface standardization, edge calculation and the like, and can be accessed to sensing layer equipment of various communication types. And the device supports plug and play, has a self-description capability, and realizes software and hardware decoupling.

The invention discloses a distributed bus protection device for a hydropower station and a bus differential protection method, the distributed bus protection device comprises a host, the host is in communication connection with a plurality of sub-machines, and the host and the sub-machines are in single-channel or dual-channel optical fiber connection; the bus is provided with a plurality of branches, and the sub-machines are connected with the branches; wherein the branch circuit is provided with a plurality of circuit breakers used for controlling the on-off of the branch circuit, the branch circuit is also provided with a current transformer used for carrying out current sampling on the branch circuit, and the circuit breakers and the current transformer are connected with the sub-machine. The distributed topology design of cooperation of the host and the plurality of sub-machines can be adapted to various different bus systems, and a dual-channel optical fiber redundancy communication mechanism is matched to effectively overcome the fatal defect of protection failure of the whole station caused by a single-point fault of a centralized device. And when the host single board fails, the sub-machines can still realize cross-interval collaborative tripping through the preset local / opposite side identification codes.

The invention discloses an energy storage unit area protection control system and method based on GOOSE communication and differential protection, and aims at different faults of an AC side bus fault, a line fault, a transformer fault, a PCS AC side and the like of an energy storage unit. Multi-section stepped protection of the alternating current side of the energy storage unit is formed by configuring busbar differential protection, unit differential protection, longitudinal differential protection, quick-break overcurrent, frequency, voltage and temperature protection, SV sampling, GOOSE tripping and communication locking are adopted between the protection device and a PCS inverter, and quick removal, timely isolation and shutdown during various inter-phase short circuits, overload faults and PCS body faults are achieved.

The invention discloses a vehicle differential protection method and device, a medium and a vehicle. The method comprises the steps that the current differential power of a differential is obtained, and the current temperature of lubricating oil in the differential is obtained; according to pre-measured relational data, a first power threshold value matched with the current temperature is determined, and the relational data is a reverse relation representing the relation between the lubricating oil temperature and the power threshold value; and if the current differential power is larger than the first power threshold value, the differential mechanism is triggered to be protected. The performance of the differential mechanism is not limited.

The invention belongs to the technical field of power systems, and discloses a transformer fault current and inrush current distinguishing method based on VMD and box dimension, and the method comprises the following steps: obtaining an original time domain signal, setting VMD parameters, and optimizing the span; step-by-step correction is carried out in the specified span, and VMD decomposition is carried out on the original signal; the optimized VMD parameters are decomposed, and an effective IMF component sum is obtained through a kurtosis index in combination with a correlation coefficient method; further calculating a box dimension of the sum of the effective IMF components obtained by calculation; and calculating various fault conditions of the transformer and the box dimension during excitation surge current of the transformer, and judging the current type. By optimizing the VMD parameters, screening the effective IMF components, calculating the box dimension of the effective IMF components and combining threshold judgment, high-precision distinguishing is achieved, the problems that a traditional method is poor in adaptability and complex in calculation are solved, and the method is suitable for the differential protection device of the power transformer.

The invention provides an optical fiber differential protection decision-making method and system based on adaptive multiple transmission lines, and the method comprises the steps: collecting the real-time optical signal waveform data of each line in the multiple transmission lines, and extracting a differential current feature set corresponding to each line, generating a joint feature sequence, inputting the joint feature sequence into a pre-trained adaptive multi-transmission line model, and obtaining protection priority parameters corresponding to each line; based on the matched differential protection threshold corresponding to each line, generating a self-adaptive trigger condition of each line; the actual differential current value of each line is monitored in real time, and if it is detected that the actual differential current value of the target line reaches the corresponding self-adaptive triggering condition, the differential protection action for the target line is activated; and according to priority parameters output by the adaptive multi-transmission line model, monitoring frequencies of other lines which do not trigger protection actions are adjusted. According to the invention, when the optical fiber differential protection is carried out, the fault positioning precision and the system operation stability can be improved.

The invention provides a double-bus differential protection processing method, device and equipment. The method comprises the following steps: acquiring state information of a bus coupler switch and polarity requirement information of a bus coupler current transformer; according to the polarity requirement information, input information in a functional soft pressing plate of the protection device is obtained; obtaining a bus coupler current coefficient of each bus according to the state information and the input information; according to the bus coupler current coefficient of each bus, obtaining a small-difference action current of each bus; and performing control protection processing on each bus according to the small difference action current of each bus and a preset setting value. According to the scheme, polarity self-adaption of the protection device can be realized, the calculation accuracy of small-difference action current of each bus is ensured, the protection device is prevented from generating abnormal differential current to give an alarm or even malfunction, a secondary wiring mode of the current transformer does not need to be changed, and the reliability is high. The workload of technical improvement work of the transformer substation is reduced; and the working safety and the working efficiency are improved.

A Faraday magneto-optical effect based optical computing method and system for relay protection, relating to the technical field of relay protection of power systems. The present invention aims to solve the problem that the current amplitudes and phases of lines on two sides of a protected object are not equal due to a transformer ratio and a connection group when optical differential protection is introduced into the field of transformer protection. In the present invention, a cascade optical computing solution is used; three optical current transformers are connected in series on one optical path, and a final output optical signal is formed by means of cascaded multiplication of outputs of the three optical current transformers and carries an angle of optical rotation containing differential current information; and a filter circuit is used to detect a carrier signal and a modulation wave signal of the optical signal outputted by the third optical current transformer, then a modulation ratio is calculated, and finally, a differential current is calculated.

The embodiment of the invention provides a differential relay protection device, equipment, system and method and a storage medium, the differential relay protection device comprises a clock module, the clock module is configured to create a first clock for the differential relay protection device, the first clock is configured in a precision time protocol domain, and the clock module is configured to create a second clock for the differential relay protection device, the second clock is configured in a precision time protocol domain; the second clock and the first clock operate independently; a power data obtaining module configured to obtain power data collected based on a second clock; and a processing module configured to perform a differential relay protection function through the first clock. According to the differential relay protection device disclosed by the invention, an independent precise time protocol domain can be configured for a differential relay protection function, so that power data synchronization is realized in a mode of low hardware cost, low system framework complexity, high flexibility and high operation stability, and the differential relay protection function is realized.

A compound ratio differential verification method and apparatus under multi-distributed new energy connected to a feeder line. The method comprises ratio differential protection speed verification, ratio differential protection reliability and stability verification, and ratio differential protection sensitivity verification; acquiring a transfer error δ caused by CT saturation of a fault branch, if the formula is formula (I), passing the verification, or otherwise, not passing the verification; and acquiring the proportion of a current flowing out of a bus to the total fault current as Ext, if the formula is formula (II), passing the verification, or otherwise, not passing the verification.

The invention discloses a differential protection function test method and system based on remote data synchronization, and relates to the technical field of power system relay protection tests.The method comprises the steps that host and slave test devices are deployed remotely, and communication is established through standby optical fibers; the host test device responds to the configuration parameters to generate two-dimensional test data, synchronizes the two-dimensional test data to the slave test device and calculates channel delay; based on the FPGA logic architecture and channel delay, the two test devices synchronously output test data to the differential protection device; the system comprises a remote testing device, a differential protection device and a standby optical fiber link, the testing device is integrated with a plurality of functional units such as an FPGA, the method supports fault-tolerant recovery, multi-scene expansion and result analysis, the remote synchronous testing problem is solved, the testing accuracy and comprehensiveness are improved, and the testing efficiency is improved. The method is suitable for substation differential protection function verification.

The invention discloses a traction transformer ratio differential protection performance testing method, system and device, and relates to the technical field of traction transformer performance testing, and the method comprises the steps: obtaining the specification information of a detection object, and collecting the real-time characteristic data information of the high and low voltage sides of the detection object; according to the invention, the action state interval data of the differential action and the braking action in the detected object are determined according to the model specification of the transformer of the detected object and the characteristic expression data of the high-voltage side and the low-voltage side; and then real-time data of the detected object is collected and matched with action state interval data of differential action and braking action in the detected object, the real-time feedback action condition of the detected object is judged, whether the detected object has a fault or not is determined, and the state of the detected object is judged. The defect that in the prior art, a traction transformer ratio differential protection test of a high-speed rail maintenance pipe is not high in reliability is effectively overcome.

The invention discloses a phasor differential protection method and system based on regulation and control characteristics of a low-frequency converter, and belongs to the technical field of relay protection. The method comprises the following steps: calculating negative-sequence current and positive-sequence voltage at two sides of a protected line based on three-phase voltage and current phasors; judging whether the drop depth of the positive sequence voltage meets a three-phase fault criterion, if so, not adjusting a braking coefficient, and if not, adjusting the braking coefficient through the amplitude ratio of the negative sequence current, and calculating a self-adaptive braking coefficient based on the regulation and control characteristics of the low-frequency converter based on the adjusted braking coefficient; and constructing a phasor differential protection criterion based on the adaptive braking coefficient, obtaining fault current vectors at two sides of the protected line, and starting phasor differential protection for the protected line when the fault current vectors meet the differential protection criterion. According to the method, protection sensitivity and reliability can be considered, and the sensitivity of main protection of the flexible low-frequency power transmission line is improved.

The invention relates to the technical field of fire sensing, and discloses an electrical fire state sensing system and method for a low-voltage distribution line, and the method comprises the steps: setting a first monitoring point at a wire inlet end of a distribution loop, setting a second monitoring point at a load access end, setting a differential protection region, and calculating a first on-resistance; performing moving average processing on the first on-resistance to obtain a second on-resistance, calculating a first reference on-resistance according to the second on-resistance, and performing temperature correction on the first reference on-resistance to obtain a second reference on-resistance; according to the method, the on-resistance deviation rate, the on-resistance growth rate and the on-resistance fluctuation coefficient are calculated, whether the on-resistance is in an early warning state, an alarm state or a dangerous state is judged, the on-resistance of the section is calculated in real time according to the ratio of the differential voltage drop to the current, and the technical problem that a fault section cannot be accurately positioned through traditional whole-line monitoring is solved.

The application relates to an adaptive current differential protection method based on a communication noise fault-tolerant mechanism. Real-time current information transmitted via a non-ideal communication channel at both ends of a protected line is acquired; the amplitude ratio and phase angle difference of a current operating point on a rho plane are calculated; absolute braking zone boundary conditions and absolute action zone boundary conditions are set according to the signal-to-noise ratio of a current communication channel; the adaptive amplitude boundary and adaptive phase boundary of a noise adaptive zone are calculated in the form of a sine function according to the phase angle difference of the current operating point; the current operating point is compared with each boundary condition to determine the region to which the current operating point belongs, wherein the action condition of the noise adaptive zone is that the amplitude is less than an adaptive threshold or the phase absolute value is less than the adaptive threshold; and corresponding protection actions are performed according to the determination result. By introducing the noise adaptive zone with the dynamically sine-adjusted boundary of the phase angle difference between the traditional action zone and the braking zone, the noise resistance of the differential protection under the non-ideal communication condition is significantly improved.

The utility model discloses a magnetic balance protection control system of a compressor motor, which belongs to the technical field of electrical relay protection and comprises a main starting loop and a frequency converter protection device. A head end motor, a first starting loop, a head end magnetic balance differential protection device and a head end operation loop; and a plurality of intermediate end motors, a plurality of second starting loops, a plurality of intermediate end magnetic balance differential protection devices, and a plurality of intermediate end operation loops. According to the utility model, the front-end motor and each middle-end motor are respectively connected to the main starting loop provided with the frequency converter protection device through the first starting loop and each second starting loop to protect each starting loop; a head-end magnetic balance differential protection device is installed on a head-end operation loop, middle-end magnetic balance differential protection devices are installed on middle-end operation loops, and a tail-end magnetic balance differential protection device is installed on a tail-end motor operation loop, so that continuous differential protection of a compressor motor set in the starting stage to the operation stage is met.

The application relates to the technical field of differential protection, in particular to a power distribution network distributed differential protection method and system suitable for a 1.4GIGS communication network, which comprises the following steps: based on the current and voltage parameters of each node of the power distribution network, real-time data is extracted and analyzed, the difference between the nodes is calculated, the nodes meeting the conditions are screened out by analyzing the difference values, signal receiving monitoring is carried out, and a list of key monitoring nodes is generated. In the application, the node signal transmission path is optimized through a power distribution algorithm, the time-frequency resource distribution of the signal is dynamically adjusted, the efficiency and stability of signal transmission are realized, the bit error rate in the signal transmission process is effectively reduced, the response speed and accuracy of the power distribution network differential protection system are improved, the interference information in the signal is processed through a particle swarm optimization algorithm, the frequency spectrum structure of the signal is optimized by rearranging and rotating the interference signal, the transmission parameters of the signal are adjusted, and the stability and anti-interference ability of signal receiving are greatly improved.