277 results about "Distributed power" patented technology

The invention provides a method and a system for evaluating, regulating and controlling operation stability and electric energy quality of an active transformer area based on edge calculation. The operation information such as low-voltage side voltage and current is collected through the area side edge calculation terminal, the indexes such as the load rate, the power factor, the three-phase unbalance degree, the voltage deviation and the voltage harmonic distortion rate are calculated, and the operation stability and the electric energy quality of the area are comprehensively evaluated after scoring according to a preset rule. And a distributed power supply, an energy storage device and a reactive power compensation device in the transformer area are regulated and controlled according to an evaluation result, so that the operation stability and the electric energy quality are improved. The method can comprehensively reflect the operation stability and the electric energy quality of the transformer area, and is beneficial to improving the operation stability and the power supply quality.

The invention relates to the technical field of micro-grids, and discloses a control method of a distributed power supply in a plant micro-grid, and the method comprises the steps: S1, constructing a multi-source collaborative micro-grid system; s2, executing real-time power dynamic allocation; s3, working condition power balance control; s4, active regulation of bidirectional power flow and the like. Based on a real-time AGC instruction and plant load data, a hierarchical coordination mechanism is adopted, charging and discharging power is dynamically adjusted by means of stored energy to track the AGC instruction, and constant power output of wind power is maintained in combination with a wind power prediction model; when a thermal power generating unit is subjected to deep peak regulation, shutdown or fault, the system absorbs excess wind power through energy storage charging, synergistically improves the hydrogen production load power, guarantees dynamic matching of the load and power generation, and actively adjusts energy storage charging and discharging and hydrogen production loads by monitoring the power flow directions of a thermal power generating unit section and a desulfurization section in real time according to voltage fluctuation caused by bidirectional power flow. And the voltage deviation is dynamically compensated, and the system voltage stability is greatly improved.

The invention discloses a power distribution feeder fault detection method considering transient frequency response of a distributed power supply, which relates to the technical field of power distribution network fault detection and comprises the following steps: acquiring a voltage traveling wave signal and performing wavelet transformation to obtain a multi-scale wavelet coefficient; calculating wavelet energy entropy and extracting local time-frequency energy characteristics; constructing a time-frequency energy matrix and calculating a norm of the time-frequency energy matrix to judge whether detection is started or not; and after a threshold condition is met, normalizing the energy matrix, screening out invalid data, calculating a non-zero norm, obtaining a distribution proportionality coefficient according to the non-zero norm, and finally completing fault identification. The method has better effects in the aspects of accuracy and applicability.

The invention discloses a distributed power supply cooperative control method based on transient dynamic characteristic adaptive driving, which adopts a multi-dimensional transient performance coupling evaluation function, unifies multiple targets including frequency, voltage, power angle and operation economy into a global optimization target, and fundamentally solves the defect of single target in the prior art. A collaborative strategy network based on dynamic context awareness is adopted, and a time sequence processing technology based on an attention mechanism is utilized, so that an intelligent agent can extract key transient dynamic characteristics from a local observation sequence, and the limitation of no memory and non-self-adaption in the prior art is broken through; according to the method, a cooperative control flow of a cooperative control strategy is provided, a high-performance learning type strategy is combined with a high-reliability safety monitor, the problem that safety and performance are difficult to be compatible is solved, fundamental transformation of distributed power supply control from passive, local and static rule-based modes is achieved, and the transient stability margin of a novel power system is remarkably improved.

The invention relates to a power distribution network line voltage regulating device locating and sizing method and device based on voltage space-time distribution characteristics. The method comprises the following steps: screening out the lowest voltage value and the highest voltage value in a line all the year round, and respectively extracting power distribution outlet voltages under corresponding time sections; voltage distribution models from a power distribution outlet to a user corresponding to the annual minimum voltage value and a user corresponding to the annual maximum voltage value are constructed respectively, and then the installation distances under the corresponding working conditions are calculated according to the critical voltage values of the voltage regulating device under the different working conditions; determining a target installation position according to the first installation distance and / or the second installation distance based on the power distribution network line out-of-limit condition; and searching a tower near the target installation position along the power distribution network line as an installation tower of the voltage regulating device, and determining the capacity of the voltage regulating device according to the load of the line at the rear end of the installation tower. According to the invention, the problem of voltage out-of-limit caused by factors such as power supply radius increase and distributed power supply access of a medium-voltage or low-voltage line can be effectively solved.

The invention relates to the technical field of distributed power supply operation control of a power distribution network, and discloses a node voltage distribution control optimization method, a node voltage distribution control optimization system, node voltage distribution control optimization equipment, a node voltage distribution control optimization medium and a node voltage distribution control optimization product of a power distribution area. And taking the voltage distribution of each node in the whole domain as an initial voltage distribution condition of load flow calculation, and performing load flow calculation on the power distribution area under the condition of meeting safety constraints and a load flow equation to obtain optimal active power output and optimal reactive power output under the condition that the deviation between the voltage of each node in the whole domain of the power distribution area and a preset rated voltage is minimized. The power scheduling instruction is generated through the optimal active power output and the optimal reactive power output, and the local controller of each distributed power supply executes the power scheduling instruction, thereby achieving the global optimization of the voltage of the power distribution network through the cooperative adjustment of each distributed power supply, and effectively improving the quality and reliability of electric energy.

The invention provides a master station and voltage-time cooperative self-healing method, device and equipment, and belongs to the technical field of power distribution automation of a power system. The method is applied to a power distribution network containing a distributed power supply, and comprises the following steps: when a fault signal of a feeder line and an opening signal of an outgoing circuit breaker are received, detecting whether a splitting signal of a grid-connected switch of the distributed power supply is received within a certain time, and if not, remotely controlling the splitting of the distributed power supply by a power distribution master station; and after delay time is determined according to the fault type of the feeder line and delay waiting is carried out, whether a closing and blocking signal is received is detected, and if yes, the power distribution main station starts self-healing to carry out fault positioning and recover power supply of a non-fault area at the downstream of a fault point. The method can improve the fault processing reliability of the power distribution network, and improves the safety and power supply reliability of the power distribution network.

The invention discloses a tunnel reluctance current sensor self-correction measurement method, system and device based on voltage feedback and a medium, and belongs to the technical field of current measurement and sensor anti-interference, and the method comprises the steps: extracting fundamental wave complex components at the fundamental wave frequency of a power supply voltage and an initial output voltage; calculating a filter coefficient according to the fundamental wave complex component and performing phase correction on the output voltage to obtain a corrected output voltage sequence aligned with the phase of the power supply voltage signal; calculating a voltage ratio signal according to the corrected output voltage and the power supply voltage and determining a ratio signal residual error; final current estimation is obtained according to the voltage ratio signal and the ratio signal residual error in combination with the ratio signal; according to the invention, a double-closed-loop compensation structure is adopted, so that channel mismatching and non-linear interference are effectively suppressed; the digital implementation mode enables the system to have good reconfigurability and environmental adaptability, and the system is suitable for application scenes such as intelligent power grids, distributed power monitoring and industrial online detection.

The invention discloses a single-phase earth fault line selection method based on double-layer parameter adaptive optimization, and the method comprises the following steps: collecting three-phase current corresponding to each feeder line of a target system after the single-phase earth fault of the target system occurs, and carrying out the calculation to obtain zero-sequence transient current; inputting the zero-sequence transient current into a self-adaptive optimization decomposition model for self-adaptive decomposition to obtain an intrinsic mode component of a corresponding feeder line; extracting transient characteristics based on the intrinsic mode component and constructing a transient characteristic matrix; and inputting the transient characteristic matrix into a pre-trained optimization mechanism fault line selection model, outputting a fault posterior probability corresponding to each feeder line, and determining a fault feeder line according to the fault probability. According to the invention, double-layer parameter adaptive optimization is used for carrying out joint optimization on key parameters of a decomposition model and key parameters of a line selection model, so that effective feature extraction and reliable discrimination can still be realized under the conditions of complex zero-sequence transient current high-frequency components and unclear features caused by the access of the distributed power supply; therefore, misjudgment and missed judgment are reduced, and the fault line selection accuracy and robustness are improved.

The invention discloses a novel power grid harmonic compensation method and system based on harmonic responsibility division, and relates to the technical field of power grid harmonic compensation, and the method comprises the steps: collecting voltage and current signals at a common connection point of a power grid, and extracting each harmonic component from the voltage and current signals; based on each harmonic component, identifying harmonic impedance of a system side and a user side, and calculating a responsibility factor sequence corresponding to each harmonic; performing statistical analysis on the responsibility factor sequence in a preset time window to generate responsibility fluctuation entropy representing responsibility stability; dynamically correcting the compensation priority of each harmonic according to the responsibility factor and the responsibility fluctuation entropy corresponding to the responsibility factor; generating a harmonic compensation instruction of a non-user responsibility part according to the responsibility factor and the harmonic component after priority correction, and distributing available compensation capacity according to the priority when the capacity of a compensation device is limited; the method is applied to a system comprising a plurality of distributed power supplies with harmonic regulation and control capability.

The invention relates to the technical field of power distribution system control, in particular to a transformer area voltage compensation control method and system considering distributed power supply fluctuation. Constructing an electric energy quality influence coefficient of each grid-connected point in each time period according to the three-phase voltage and a difference condition among positive-sequence, negative-sequence and zero-sequence components obtained by three-phase voltage decomposition, and calculating a comprehensive disturbance coefficient of a low-voltage transformer area in each time period by combining voltage difference and voltage change trend synchronism among different grid-connected points; the distribution difference and the coupling influence relation between the grid-connected points are comprehensively considered, and the influence characteristics of the fluctuation of the distributed power supply can be evaluated more accurately; the gain coefficient in the sliding mode controller is optimized based on the obtained comprehensive disturbance coefficient, and the adjusted controller is adopted to carry out transformer area voltage compensation control, so that the defect that the transformer area voltage compensation precision and reliability are insufficient can be overcome.

The invention discloses a distributed voltage control method under variable topology of an active power distribution network based on data driving, and the method comprises the steps: employing a Koopman dimension raising linearization method to be combined with least square estimation based on historical operation data under different topologies of the active power distribution network, and carrying out the training, and obtaining a linearization power flow matrix corresponding to each topology; establishing a mapping relation between the filial generation matrix and the corresponding linearized power flow matrix, and generating a topological adaptive power flow element model; when the topology of the active power distribution network changes, generating a linearized power flow matrix corresponding to the new topology; solving the linearized power flow matrix of the new topology through differential operation to obtain a sensitivity matrix of the voltage to the reactive power of the distributed power supply; the voltage amplitude and the reactive power of a local node are measured by taking minimization of the reactive power regulation quantity of the distributed power supply as a target; and each node adjusts the reactive power of the distributed power supply in situ by combining the measurement information of the node and the adjacent node, and loop iteration is carried out until the voltage of each node is stabilized in an allowable range.

The invention discloses a power distribution network voltage sag monitoring point multi-target selection method considering a distributed power supply low voltage ride through characteristic. The method comprises the following steps: providing a distributed power supply low voltage ride through strategy; deriving a voltage sag amplitude analytical expression under various short circuit fault types considering the low voltage ride through characteristic of the distributed power supply; introducing a position variable to construct a function relation between a voltage sag amplitude and a fault position; solving a voltage sag domain critical point by using a differential evolution algorithm; based on the sag domain critical point, establishing a monitoring point multi-target selection model taking economical efficiency, redundancy and construction urgency minimization as a target function; solving the established monitoring point multi-target selection model by adopting a multi-target particle swarm algorithm to obtain a Pareto optimal solution set; and according to the obtained Pareto optimal solution set, adopting an ideal point method to screen out an optimal point distribution scheme. According to the method, the voltage sag domain can be accurately divided, and multi-objective optimization of economical efficiency, low redundancy and low construction urgency of monitoring point layout is realized on the premise of satisfying panoramic observability.

The invention discloses an electric-thermal coupling system cooperative load recovery method and system considering electric vehicle aggregation charging and discharging. The method comprises the following steps: step 1, establishing an objective function with the minimum load loss amount of the electric-thermal integrated energy system; 2, constructing an electric-thermal coupling system collaborative load recovery model, wherein the model comprises load recovery stage network topology constraint, power system steady-state operation constraint and regional heat supply system steady-state operation constraint; and step 3, solving by using an interior point method to obtain output of a power distribution network, a regional heat supply system network topology, a transformer substation, a distributed power supply and a cogeneration unit in the electric-thermal coupling system. The method provided by the invention can be practically applied to formulating a toughness improvement strategy of the park-level electro-thermal coupling system, fully exploits the flexibility of an electric vehicle cluster, reduces the overall load loss amount of the system, enhances the ability of the system to cope with sudden faults, and ensures the safe and stable operation of the system.

This invention provides a microgrid power coordination method and system based on state-enhanced Kalman filtering, relating to the fields of new energy, power electronics, power conversion, and control technologies. The method includes: constructing a state-space model of an AC microgrid and modeling feeder impedance as an augmented state, thus constructing an augmented state-space model of the AC microgrid; based on the augmented state-space model, using an improved Kalman filtering algorithm, calculating the optimal estimate of the feeder impedance of each distributed power source unit, and using an optimal impedance adjustment algorithm to calculate the virtual impedance of each distributed power source unit; and adjusting the output voltage of each distributed power source unit according to its virtual impedance to achieve reactive power regulation of the AC microgrid. This invention effectively solves the problem of the difficulty in directly obtaining feeder impedance in practical engineering and compensates for feeder impedance mismatch by allocating virtual impedance, thereby achieving reactive power balance in the AC microgrid.

This application discloses a method, a power cabinet, and a power distribution control system for controlling power distribution from a power module to a charging terminal. A power distribution method includes: a power control unit determining a power distribution mode for one or more charging terminals, including: obtaining the number of available modules in the power module; calculating the required number of modules based on the power demand from one or more charging terminals and the rated power of a single power module; comparing the required number of modules with the number of available modules; determining an efficiency-priority mode or a power-priority mode as the power distribution mode based on the comparison result; the power control unit selecting a target power module and determining a target power path based on the power distribution mode; and the power control unit sending an instruction to a power distribution unit, causing the power distribution unit to invoke the target power module to distribute power to the charging terminal by controlling the operation of a switch associated with the target power module and the target power path.

A large-capacity modular double-layer arrangement substation system relates to the field of electric power construction such as new energy and distributed power supply, and is mainly designed to solve the problem of large land occupation of traditional substations. It comprises a transformer in an accident oil pool, a steel wheel of the transformer is arranged on a track of a foundation, support columns of a steel structure platform are fixed on the foundation, a container is fixed on the steel structure platform, and high-voltage switch equipment is fixed on an outer side wall of the container. A high-voltage circuit breaker of the high-voltage switch equipment is connected with a high-voltage isolation / grounding switch through a conductor, the high-voltage isolation / grounding switch is connected with a high-voltage bushing, the high-voltage circuit breaker is connected with a high-voltage connection line of a high-voltage bushing of the transformer through a high-voltage isolation plug, and a connection cable between a low-voltage bushing of the transformer and an outdoor terminal of a medium-voltage porcelain bushing type cable is connected through a low-voltage isolation plug. The advantage is that the land occupation can be reduced.

The invention discloses a fault isolation and self-healing control method for a multi-terminal flexible direct current power supply system in the field of flexible direct current power supply, and aims to solve the technical problems that a traditional multi-terminal flexible direct current system is lagged in fault positioning, low in isolation speed, not timely in self-healing response and low in power supply recovery precision. According to the method, through a closed-loop control logic of fault feature extraction, accurate positioning, rapid isolation and dynamic self-healing, a fault identification model is constructed based on collaborative features of transient current and voltage, and millisecond-level positioning of a fault section is realized in combination with a simplified fault positioning formula; an IGBT series solid-state circuit breaker is adopted to realize rapid fault isolation, a self-healing scheduling strategy of load priority and resource adaptability is introduced, and power supply is recovered through cooperative scheduling of a distributed power supply and an energy storage unit. The fault isolation time is shortened, the power supply recovery success rate is improved, the voltage recovery deviation is reduced, and the power supply reliability and the operation toughness of the multi-terminal flexible direct current power supply system are remarkably improved.

The application provides a micro-grid group operation mode seamless switching control method based on hybrid active disturbance rejection, first, the differential of the output frequency / voltage of the non-restraint distributed power is introduced and synchronously tracked to the differential of the frequency / voltage of the restraint distributed power of the micro-grid group layer, the frequency / voltage disturbance rejection secondary control compensation of the non-restraint distributed power of the micro-grid layer is calculated, the frequency / voltage disturbance rejection recovery controller of each restraint distributed power of the micro-grid group layer is designed to ensure the reliable and stable operation of each region in the new operation mode; then, through the active / reactive power control of the micro-grid layer and the micro-grid group layer, the pre-synchronization controller is designed by combining the hybrid active disturbance rejection, so that the voltage and phase angle of the two sides of the interconnected switch are matched, the hybrid active disturbance rejection is introduced into each control layer of the micro-grid group, the frequency / voltage autonomous control and pre-synchronization compensation are realized based on the system disturbance estimation compensation, and the seamless transition between multiple operation modes is coped with.

This application discloses a health management and resource optimization configuration method for a distributed power supply in a test cabinet. The method includes: collecting electrical and temperature parameters of multiple sub-modules of the power supply during operation; extracting feature vectors representing the degradation state of the power supply based on a sliding time window; obtaining health information of multiple sub-modules; adaptively adjusting the reporting strategy of health information; and outputting power control commands for at least one sub-module. When a sub-module's health risk indicator is detected to exceed a preset risk threshold, the sub-module is marked as a risk sub-module, and at least one type of migrateable load is migrated from the risk sub-module to a candidate sub-module. Output channel isolation control is performed on the risk sub-module, and the power supply path used for status detection is retained. The display priority of multiple sub-modules is calculated, sorted and displayed according to the display priority, and multi-level alarm prompts corresponding to the health risk indicators are triggered simultaneously.

The invention discloses a power distribution network control method, device and equipment and a storage medium, and relates to the technical field of distributed control, and the method comprises the steps: determining a first control mode of a first coordination controller corresponding to a first distributed power supply in an AC sub-grid, and a second control mode of a second coordination controller corresponding to a second distributed power supply in the DC sub-grid. Determining a topology conversion control variable value according to the on-off state corresponding to the target intelligent switch and the system operation mode; adjusting the working frequency and the working voltage of the first distributed power supply based on the topological conversion control variable value and the first control mode; and adjusting the working voltage of the second distributed power supply based on the topological conversion control variable value and the second control mode. According to the technical scheme, the technical problem that in the prior art, when topology conversion is carried out on an alternating-current and direct-current hybrid power distribution system based on static topology, unwanted transient states can be generated, so that the operation flexibility of the system is reduced or cascade faults occur is solved.

The invention relates to the technical field of hilling equipment, and discloses a distributed power electric sugarcane hilling machine which comprises a rack of a gantry type symmetrical structure. The pair of crawler walking devices is symmetrically mounted on the two sides of the bottom of the rack; the visual navigation module is arranged on the front side of the top of the rack and used for collecting ridge line information and correcting the advancing direction. The hilling mechanisms are installed behind the crawler walking devices through height adjusting mechanisms correspondingly, and the height adjusting mechanisms can adjust the height between the hilling mechanisms and the ground. The control module is arranged at the bottom of the rack and used for receiving control signals and controlling the whole machine to operate. The power module is arranged at the bottom of the rack and provides power for the crawler walking device, the ridging mechanism and the height adjusting mechanism, and the problems that a small ridging machine is low in intertillage ridging efficiency and poor in quality are solved.

The embodiment of the specification provides a distributed power voltage control method and device based on a trusted interaction blockchain, wherein the method comprises: taking a distributed power node as a blockchain network node, constructing a voltage control model in which the distributed power node affects the voltage of a node by adjusting reactive power; constructing a blockchain trusted interaction mechanism, a node generates a voltage measurement transaction with a digital signature based on collected local voltage and records it on a chain, verifies and shares voltage data through a consensus mechanism; using verified neighbor node voltage information read from the blockchain, constructing a distributed collaborative voltage control law containing a local adjustment term and a blockchain interaction term; constructing a closed-loop structure of voltage collection, on-chain verification and control execution, and nodes execute the control law based on trusted shared voltage data to achieve collaborative voltage control without a centralized controller. The trusted collection, safe sharing and decentralized collaborative control of distributed power voltage data are realized.

The invention relates to the technical field of low-voltage power distribution network operation control and fault processing, and discloses a low-voltage power distribution network multi-mode collaborative self-healing method, system and device based on a capacity regulating transformer and a medium. And according to the tap position of the capacity-regulating transformer and the state of the distributed power supply, a system reconstruction mode is decided. And an optimal power supply island is divided by utilizing an improved graph theory algorithm, so that the distributed power supply can be utilized to supply power to the key load to the maximum extent. An optimization model with capacity regulating transformer loss, network loss and switching action times as targets is established for a main network recovery part, and meanwhile, a GA-BFGS hybrid algorithm is adopted for efficient solving. The method effectively solves the problems that a traditional low-voltage power distribution network is insufficient in recovery capability, and the cooperation efficiency of the transformer and the distributed power supply is low, and remarkably improves the power supply reliability and economy.

The invention discloses an AC / DC hybrid microgrid electric energy intelligent management circuit, and relates to the technical field of hybrid microgrids, and the circuit comprises a micro-control module which controls a high-voltage conversion module and a low-voltage conversion module to supply power to a standby power supply module, carries out AC / DC electric energy interaction when an AC bus or a DC bus is unbalanced, and carries out DC / AC electric energy interaction when the power is insufficient. When the standby power supply module is in low voltage, the electric energy voltage output by the low-voltage conversion module is increased, and when the power distribution network has no power, the high-voltage conversion module is controlled to distribute power to the alternating-current power grid or the direct-current power grid according to the power distribution priority; aC electric energy provided by a power transmission and distribution network is transmitted and electric energy interaction is maintained. The AC / DC hybrid microgrid electric energy intelligent management circuit can maintain the electric energy balance of the AC / DC bus, automatically adjust the electric energy voltage gain according to the electric energy power state during the electric energy interaction, and meet the power demands of the AC / DC bus in different electric energy states.

The utility model belongs to the technical field of power supplies, and particularly discloses a novel distributed power supply device of a DCS (Distributed Control System), which comprises four power supply modules and three interface boards P9, P10 and P11, the four power supply modules are respectively a main line power supply module P1, a primary auxiliary power supply module P2, an auxiliary line power supply module P3 and a secondary auxiliary power supply module P4, and each of the interface boards P9, P10 and P11 is provided with seven interfaces. According to the scheme, the power supply device of the DCS system is replaced, replaced and transformed, an old power supply module adopting a cooling fan is canceled, and power supply configuration is optimized. The maximum benefit can be created with the shortest time and the least investment, and the comprehensive control capability and the production management level of the unit auxiliary control DCS control system are improved. By means of dispersive arrangement, heat dissipation is good, a cooling fan does not need to be arranged, dust resistance is high, operation is safer and more reliable, the service life is longer, the requirements of various operation working conditions are met, and safe and efficient operation of a unit is guaranteed.

The disclosure relates to a crane arm (100) comprising: a first boom (10) configured to be movably connected to a crane assembly (1) for supporting the crane arm (100); a second boom (20) movably connected to the first boom (10), a set of electrically powered actuators (50) powered by AC power signals, the set of actuators (50) comprising at least a first actuator (52) with a first electric motor (62) and a second actuator (54) with a second electric motor (64), wherein the first actuator (52) is arranged to move the first boom (10) in relation to the crane assembly (1) and the second actuator (54) is arranged to move the second boom (20) in relation to the first boom (10), wherein the crane arm (100) further comprises a power distribution assembly (70) including an interface (72) for receiving a DC power signal; and a set of spatially distributed power converting units (80) arranged to convert the DC power signal to an AC power signal for a respective electric motor (62, 64) of the set of actuators (50), wherein each power converting unit of the set of power converting units (80) is arranged adjacent to the respective electric motor (62, 64).

To provide a decentralized power supply control system and a decentralized power supply control method that can appropriately control decentralized power supplies while detecting the life of or an abnormality in the decentralized power supplies.SOLUTION: A decentralized power supply system comprises: a first server that generates control commands controlling decentralized power supplies installed in facilities; and a second server that relays the control commands between the first server and the decentralized power supplies. The second server comprises a storage unit that stores measurement data related to the decentralized power supplies, and a calculation unit that calculates a predicted value of the measurement data with reference to a predetermined time. The first server includes a generation unit that generates the control commands on the basis of the predicted value of the measurement data.SELECTED DRAWING: Figure 1

The invention provides a power grid fault position detection and diagnosis method, which comprises the steps of collecting current amplitude and phase from each section in a power distribution feeder, extracting voltage sag depth distribution from each position of the feeder, obtaining reactive power output force value from a distributed power supply grid-connected point, and obtaining comprehensive fault measurement information; positioning and identifying the distance between a grid-connected position and a fault point according to the current reversal amplitude and the flow direction of a downstream section, evaluating and correcting the influence of reactive power output on voltage sag, and identifying atypical sag response caused by reactive power reverse transmission; and according to the identified atypical sag response, correcting the original fixed action threshold value of the directional element and the voltage phase offset caused by the current reactive power output, and obtaining an optimized threshold value by integrating the current reversal amplitude and the voltage sag depth.

The invention discloses an electric energy meter flexible conditioning circuit connected with a distributed power supply, and aims to solve the problems of non-ideal alternating current signal distortion and compatibility of a front-end conditioning circuit of an electric energy meter. The circuit comprises an input buffer module, a conditioning engine module and a digital conversion module, the input buffer module is used for isolating and capturing a non-ideal alternating current signal accessed by a distributed power supply, and the conditioning engine module is used for correcting the non-ideal alternating current signal in real time to generate a pure alternating current waveform; and the digital conversion module is used for converting the pure alternating current waveform into a digital signal and switching a bidirectional power metering mode according to the digital signal. Through an integrated closed loop of the modules, a flexible flow of signals from isolation capture to correction conversion is formed, adaptive processing of signal characteristics such as harmonic distortion, frequency fluctuation and direct current offset is realized, and an electromagnetic compatibility self-healing module, a thermal budget intelligent throttling module and a multi-channel phase synchronization module are further introduced in parallel. The robustness is enhanced, the energy efficiency is optimized, and multiphase metering adaptation is expanded.