369 results about "Islanding" patented technology

The invention relates to the technical field of energy storage systems, and provides a self-adaptive power distribution method and system for multiple energy storage units of an island microgrid. According to the invention, a discrete consistency algorithm is adopted to realize coordination control of multiple units, each unit only exchanges information with adjacent units, and power distribution targets of all the units are converged to a consistent value through iterative computation, so that the communication bottleneck and the single-point fault risk of centralized control are avoided; according to the invention, a complete fault-tolerant processing mechanism is designed, the operation state of each energy storage unit is monitored in real time, topology updating and power redistribution are automatically carried out when a unit fault is detected, and the self-healing operation of the system is realized. Experiments show that compared with a traditional method, the method has remarkable advantages in key performance indexes such as capacity balance among energy storage units, system operation efficiency, communication overhead and fault recovery time, and the operation efficiency and reliability of the island microgrid system are remarkably improved.

The invention relates to the technical field of micro-grid control, and provides an island micro-grid distributed control method, system and device and a storage medium. Comprising the following steps: performing voltage compensation gain and frequency compensation gain calculation based on droop control output of each distributed power generation unit, droop control output of all neighbor distributed power generation units, and a voltage dynamic tracking error and a frequency dynamic tracking error which are obtained by calculating a microgrid global recovery target to obtain secondary adjustment output; and after corresponding items in the droop control output and the secondary regulation output are summed to generate comprehensive reference output, voltage synthesis is carried out according to the comprehensive reference output to obtain voltage regulation output for output control of a corresponding inverter. Based on a distributed regulation and control mechanism for cooperatively calculating the compensation amount of each power generation unit by using neighbor information and a global recovery target, the dynamic response speed and the power distribution precision can be improved, voltage drop and frequency deviation caused by load disturbance are effectively eliminated, and rapid recovery is realized.

A microgrid island division method based on a cumulative foreground theory and a transfer learning thought comprises the following steps: step 1, aiming at a day-ahead decision-making scene, taking income maximization in a scheduling period as a core target, integrating short-term renewable energy output prediction and electricity price fluctuation data, and constructing a capacity optimization configuration model; 2, constructing a double-layer model, constructing a transaction decision model by the upper-layer model by taking energy storage power station revenue maximization as a target, and determining a power station quotation strategy; the lower layer model takes the sum of the electric energy cost and the frequency modulation service cost as the target to construct a combined clearing model of the electric energy and the frequency modulation market; and 3, solving the double-layer model constructed in the step 2. According to the method, energy storage can participate in an electric energy and frequency modulation market through strategic quotation under a reasonable market mechanism, and an energy storage power station is stimulated to optimize resource allocation, so that the frequency modulation pressure of a power system is reduced, the energy storage economic benefit is improved, and the stability and resource utilization efficiency of the power market are further improved.

An inertia cooperative control method of an integrated optical storage alternating current and direct current hybrid micro-grid comprises the steps that firstly, according to static and dynamic power capacities of energy storage units in direct current sub-grids and allowed direct current voltage deviation, sub-grid equivalent virtual resistance and virtual capacitance are calculated; secondly, RC + R type parallel virtual impedance parameters are distributed according to the power proportion of each energy storage unit, and multi-energy-storage cooperative response power disturbance according to the capacity is achieved; then, a phase angle is generated based on the mapping relation between direct-current side voltage and frequency, an alternating-current voltage amplitude instruction is determined in combination with reactive power droop control and feeder impedance voltage drop compensation, and a dq-axis voltage instruction is generated through virtual impedance compensation; normalized three-phase modulation waves are obtained through voltage-current double closed-loop control and dq / abc coordinate transformation, and six paths of PWM signals are generated to drive an interconnection converter after the normalized three-phase modulation waves are compared with triangular carrier waves. The method does not need to depend on external communication, has the capabilities of autonomous inertia support, voltage and frequency coordinated regulation and reasonable multi-source power distribution, and improves the stability and dynamic response performance of the system under island operation.

The invention discloses an island microgrid distributed energy storage locating and sizing method and device based on data driving. The method comprises the following steps: acquiring a power generation power prediction value of each photovoltaic unit and a load power prediction value of each load node; determining the island power supply gap, the full life cycle cost and the energy storage charge and discharge efficiency of the micro-grid; giving out constraint conditions of operation of the micro-grid; constructing an island micro-grid simulation model based on the constraint condition of micro-grid operation; constructing a multi-objective optimization function based on the island power supply gap, the full life cycle cost and the energy storage charge and discharge efficiency of the micro-grid; and in combination with the analysis of the island microgrid simulation model and the multi-objective optimization function, giving the site selection and capacity of each energy storage unit to be configured. According to the method, a source-load uncertainty rule and time-space correlation characteristics are directly learned from historical data, distributed energy storage locating and sizing are guided, actual operation characteristics of an island microgrid are accurately matched, and reasonable configuration of an energy storage unit is achieved.

The invention discloses a transient-time varying-based transformer anti-short circuit capability dynamic checking method and system. According to the method, a high-fidelity digital twinborn model is established by constructing a four-layer database comprising a foundation, a material, a structure and operation parameters. And performing transient electromagnetic-structure coupling simulation by using the reconstructed real short-circuit current waveform driving model to obtain transient electromagnetic force, dynamic deformation and stress distribution prediction results under short-circuit impact. Meanwhile, a multi-axis degradation model covering mechanical, electrical and thermal dimensions is constructed, long-term evolution of equipment is quantified, conventional working conditions are converted into equivalent short-circuit impact times, and a comprehensive capability index is calculated. Finally, the transient impact risk and the long-term degradation degree are coupled, a four-quadrant risk assessment matrix is constructed, a comprehensive risk quantitative index is calculated, and dynamic grading and accurate positioning of the overall risk state of the transformer are achieved. According to the method, the problems of isolated island and single risk dimension of traditional static check information are solved.

The invention discloses a new energy low-carbon operation scheduling method and system for an island microgrid, and the method comprises the steps: generating a day-ahead scheduling plan with the minimization of the weighted average carbon emission intensity of a system as a core target through an upper-layer day-ahead optimization model based on load prediction data and renewable energy power prediction data; according to the day-ahead scheduling plan, generating an adjustment instruction of output of each unit through a lower-layer intra-day rolling optimization model; based on the adjustment instruction, calculating the wind and light abandoning power of the renewable energy source, and optimizing the renewable energy source consumption through a cost punishment mechanism; according to the optimized unit output and renewable energy consumption scheme, coordinating a charging and discharging strategy of an energy storage system to obtain an optimized scheduling instruction; and executing the scheduling instruction, and updating the system state through a closed-loop feedback mechanism. According to the embodiment of the invention, power balance and low-carbon operation of the island microgrid under a complex fluctuation working condition can be realized, and the utilization rate of renewable energy sources and the overall environmental protection property of the system are improved.

The invention relates to the technical field of electric power systems, in particular to a low-voltage distribution network voltage treatment method based on multi-point flexible direct current interconnection, which breaks through an island operation mode of a transformer area by introducing a flexible interconnection mechanism into a low-voltage distribution network, and improves the reliability of the low-voltage distribution network. Linkage management of multi-region voltage is realized; the flexible direct-current converter is used for realizing quick and real-time adjustment of active and reactive bidirectional power among the nodes; a set of efficient, stable and extensible multi-node power balance control algorithm is constructed, distributed collaborative optimization is realized, and dependence on a central controller is avoided; on the premise of ensuring the stability of the system, the dynamic management of the low voltage out-of-limit problem and the improvement of the electric energy quality under the complex operation condition are realized.

The invention discloses a method for improving the toughness of a power distribution network containing an energy storage type flexible soft switch in a fault state, and belongs to the field of power systems and automation of the power systems, and the method comprises the steps: extracting time sequence data and fault information of a distributed power supply and a load; according to the method, an integrated optimization model integrating fault isolation, multi-stage dynamic maintenance, network reconstruction and energy storage type flexible soft switch cooperation is constructed, minimization of whole-process power loss and branch and device loss is taken as a target, and multiple constraints including time sequence balance, device operation, maintenance resources and decoupling power flow are taken into consideration. Wherein the energy storage type flexible soft switch realizes cross-period energy time shifting through an embedded energy storage system; and a mixed integer second-order cone programming algorithm is adopted to carry out rolling solution, and island division, a maintenance sequence and a device operation strategy are synchronously optimized in each stage. According to the method, global coordination and space-time energy management of the multi-stage recovery process can be realized, and the power supply recovery capability and toughness of the power distribution network under the extreme fault are remarkably improved.

This invention discloses a preventive zoning method and system for resilient distribution networks considering the uncertainty of typhoon paths. First, a set of scenarios considering fault conditions under different typhoon paths is constructed. Then, through multi-round detection, the damage status of nodes and lines under different typhoon path scenarios is identified, and a node and line damage status detection model considering fault propagation is constructed. Next, combined with the node and line damage detection model, a preventive zoning model for resilient distribution networks considering the uncertainty of typhoon paths is constructed based on a stochastic optimization method. Finally, the constructed model is linearized to reduce the solution difficulty and then solved to obtain optimized distribution network islanding and node power supply strategies. The technical solution of this invention can properly handle the uncertainty of typhoon paths during distribution network islanding, effectively improving the risk resistance capability of post-disaster distribution network power supply restoration schemes.

The invention provides a mobile solid heat storage and storage battery coordinated island comprehensive energy system, and belongs to the technical field of electric energy supply, the system comprises a heat storage and heat exchange unit, a heat exchange fan, a thermal insulation layer, an energy storage battery, a rapid power socket, an instrument cabinet, a water circulation system, a heat exchange water pump and an inverter, and the modular and container type design is adopted; and mobile deployment and flexible expansion are realized. According to the system, electric energy is converted into heat energy for storage through the heat storage and exchange unit, time-shifting storage of the electric energy is achieved by means of the energy storage battery, independent supply and efficient complementation of electric energy and heat energy are achieved through intelligent coordination control, electric power, high-temperature hot air and hot water can be stably output, and the diversified energy utilization requirements of remote areas, emergency disaster relief and field operation island scenes are met. According to the invention, the energy self-sufficiency rate and the energy consumption safety of the island scene are obviously improved, the operation cost is reduced, and the method is green and environment-friendly and has national defense, social and economic benefits.

The invention relates to the technical field of high-voltage direct-current power transmission, and discloses a surplus power consumption control method and device for an island new energy system, and the method comprises the steps: monitoring the output energy and direct-current link voltage of a transmitting-end converter station, and carrying out the control of the surplus power consumption when the island new energy system has an alternating-current fault; controlling the receiving-end converter station to perform optimal distribution of receiving-end current and dynamic adjustment of a direct-current voltage reference value so as to preferentially absorb surplus power, and further raising output energy and direct-current link voltage; when it is detected that the output energy meets the energy requirement and the direct-current link voltage meets the voltage requirement, the sending-end converter station is controlled to correct an energy reference value so that the sending-end converter station can consume surplus power through new energy, and after the alternating-current fault is removed, the sending-end converter station and the receiving-end converter station are controlled to perform sequential energy release so that the surplus power can be eliminated. When the energy consumption device is not used, the consumption control of the surplus power of the system is realized through cooperative inertia response and sequential energy release.

The invention discloses a box-type transformer light storage integrated micro-grid system and method based on an intelligent fusion terminal. The system is characterized in that a photovoltaic power generation module is connected to a direct current side through a DC / DC converter; the energy storage module is connected to the direct current side through the bidirectional converter; the electric energy quality management module comprises a parallel converter and a series converter and is connected between a direct current side and an alternating current power grid side; the isolated island operation module is connected to an AC power grid side; the feeder protection module is connected to an alternating-current power grid side; the direct-current load is connected to the direct-current side; the alternating-current load is connected to an alternating-current power grid side; the intelligent fusion terminal is used for uniformly monitoring and scheduling the photovoltaic power generation module, the energy storage module, the electric energy quality management module, the isolated island operation module and the feeder line protection module; according to the method, continuous power supply can be guaranteed when the power grid breaks down, rapid recovery is achieved after the fault is removed, and it is guaranteed that the system has extremely high robustness and safety.

The invention relates to the technical field of grid-connected control of a power system, and discloses an island detection and self-synchronizing grid-connected method for an offshore floating power generation device, which is used for solving the problem that transient oscillation is difficult to effectively suppress in a self-synchronizing grid-connected process after island detection in a traditional method. According to the method, firstly, voltage and frequency signals are collected at a grid-connected interface, and accurate island identification is achieved in combination with multi-cycle deviation judgment and a self-adaptive threshold value; a virtual synchronous machine mode is switched after the island is confirmed, and transient power fluctuation and phase difference are utilized to set damping and perform voltage closed-loop calibration, so that the device is converged to be aligned with the phase and voltage of the power grid; after an alignment condition is met, gradual power injection is adopted to complete grid connection, voltage, frequency and power balance is verified and monitored through a parameter period, and graded adjustment or back-off is carried out when necessary, so that transient oscillation and power impact are suppressed in the whole process from island detection to grid connection again and stable operation, and grid connection stability and adaptability are improved.

The invention relates to the technical field of distributed micro-grid island detection, and discloses a micro-grid system island detection cooperative control method, device, equipment and medium, during grid-connected operation of a micro-grid system, a main disturbance source and an auxiliary disturbance source are determined based on real-time operation data of each distributed power supply; when the parameters are abnormal, the main disturbance source is controlled to carry out short-period progressive enhanced disturbance, the auxiliary disturbance source and the main disturbance source are introduced to carry out superposed same-direction disturbance if no island is detected in the enhanced disturbance process, and the main disturbance source and the auxiliary disturbance source are controlled to carry out reverse disturbance if no island is detected in the same-direction disturbance process; and circularly executing the enhanced disturbance, superposing the same-direction disturbance and the reverse disturbance until the detection is successful, and further controlling the micro-grid system to be switched to an off-grid operation mode. The offset or conflict problem caused by independent disturbance of multiple distributed power supplies is solved, and rapid and reliable island detection with the minimum influence on system operation is achieved.

Method and process of fault detection in power systems using feature extraction from the measurements of the voltages and currents in the power system, as well as machine learning methods. A computer processor, such as an industrial computer, is connected to various voltage and current measurement systems in various locations. This, in turn, is connected to a server computer and control system. Electrical power fault signals (features) propagating through the power system network are analyzed using various measurements and feature extraction methods. These can be used to detect, classify, and localize the fault. The present methods are particularly useful for hard-to-analyze faults such as high impedance faults and faults occurring due to inrush currents, bidirectional power flows, and islanding issues.

The invention discloses a power equipment detection method and device and electronic equipment. The method comprises the steps that in response to a received detection instruction for the power equipment, the detection type of the power equipment is recognized based on the detection instruction, and a recognition result is obtained, and the recognition result is used for representing the detection type of the power equipment; in response to the identification result of the island detection type, controlling a disturbance device in the power equipment to generate an inter-harmonic signal based on the detection instruction, and injecting the inter-harmonic signal into the power equipment to adjust operation parameters of the power equipment; in response to successful injection of the inter-harmonic signal into the power equipment, acquiring operation parameters of the power equipment; and carrying out island detection on the power equipment based on the operation parameters to obtain an island detection result, the island detection result being used for indicating whether the power equipment is disconnected with other power equipment or not. According to the invention, the technical problem of low island detection accuracy of power equipment in the prior art is solved.

The invention relates to the technical field of microgrid guarantee supply, and discloses a staged dynamic balance control method for realizing independent guarantee supply of a microgrid. According to the method, a state matrix is constructed based on real-time operation data, the operation stage of the micro-grid is judged, and corresponding logic is executed; in the black-start stage, the voltage frequency is reconstructed by taking grid construction type energy storage as a reference; in the island stage, a mutual aid optimization and multi-objective optimization model is adopted to maintain power dynamic balance; and synchronous tracking and smooth switching are executed in the grid connection stage. Through full-life-cycle staged accurate management and control, the problems that black start of the micro-grid is difficult and mode switching is not smooth are effectively solved, the power supply reliability is guaranteed, meanwhile, economical efficiency and power are complemented, and the stability and robustness of the system are remarkably improved.

The invention provides an intelligent management and protection system, method and equipment for a photovoltaic energy storage battery, and relates to the technical field of photovoltaic energy storage systems, operation data are collected and transmitted in real time through a remote maintenance module depending on an inverter communication module, the state of the battery can be mastered without on-site inspection, and the operation and maintenance cost and the human input are greatly reduced; the charging control module dynamically judges the charging state based on the operation data, and accurately regulates and controls the charging process in combination with the deviation degree of the operation state, so that the charging efficiency of the healthy battery is prevented from being influenced by excessive control, and the aging battery is prevented from being aggravated and attenuated due to disordered charging; when an island signal is detected by the island protection module, the power grid connection can be quickly cut off to guarantee the safety of the power grid and maintenance personnel, and the inverter can be linked to enable the battery to enter an off-grid mode to continuously supply power, so that the power supply reliability and the emergency guarantee capability of the photovoltaic energy storage system are comprehensively improved, and the intelligence and the safety of battery management are integrally realized.

This invention discloses a method and system for collaborative power supply restoration of a distribution network using multiple emergency resources under disaster scenarios. The method includes: constructing a probabilistic fault model of the distribution network under disaster scenarios and pre-deploying multiple emergency resources, and performing active power supply islanding; initially locating faulty lines based on real-time data of the distribution network and verifying the location results in conjunction with the probabilistic fault model to form a final set of faulty lines; dividing faulty areas and performing fault isolation and temporary power supply topology reconstruction of non-faulty areas based on the active power supply islanding scheme; constructing multiple recovery subtree networks (RSNs) in the non-faulty areas and collaboratively optimizing the multi-emergency resource scheduling scheme; comprehensively evaluating the restoration effect, and if the evaluation is not up to standard, dynamically adjusting the RSN construction and resource scheduling scheme to form a closed-loop optimization. This invention, by constructing a full-process collaborative framework, integrates multiple emergency resources to achieve rapid and reliable restoration of critical loads, improving the resilience and power supply stability of the distribution network under extreme weather conditions.

The application relates to a sequence-dependent plug-in island direct-current micro-grid distributed control method and system, first, local electrical parameters and interconnection line parameters of each DGU are acquired, an island direct-current micro-grid state space model is established, and a distributed controller model is constructed based on local state variables of the DGU; second, aiming at the access or cut-off request of the target DGU, the cut-off request is equivalently converted into the access request in the sequence-dependent plug-in scene, a to-be-judged insertion sequence or a candidate insertion sub-sequence is generated; finally, a linear matrix inequality constraint is constructed according to a Lyapunov asymptotic stability condition, controller parameters meeting the stability requirement are solved, and pre-stability judgment and parameter optimization of the plug-in operation are realized. The application can effectively guarantee the asymptotic stability of the island direct-current micro-grid in the dynamic plug-in scene, and improve the plug-and-play capability of the system.

The invention provides a DC power transmission control system, method, medium and equipment for new energy island transmission, and a transmitting end island AC power grid. The DC power transmission control system comprises a new energy station, a rectifier and an inverter which are connected in sequence, and a rectifier control module connected with the rectifier and the inverter; the alternating current side of the inverter is connected with an external equivalent alternating current network; when a new energy station sends out power transmission, a rectifier control module adds frequency control for a rectifier based on a current instruction value, a rectifier frequency value and a rectifier current value in an inverter, and generates a rectifier trigger angle; and the rectifier controls the current constantly output by the direct current side of the rectifier to the inverter based on the rectifier trigger angle, and then the current is transmitted to the equivalent alternating current network by the inverter, so that stable transmission of the new energy station is realized. The rectifier control module adds frequency control to the rectifier in combination with related parameters of an inverter and the rectifier in the system, so that the current value of the direct current side of the rectifier is kept constant, and sending-end island alternating current power grid oscillation cannot be caused.

This technology is a process for controlling low voltage microgrids (MGs) with centralized communication, based on the “Power-Based Control” (PBC) technique adapting the same to a modified PBC (MPBC) process. The technology provides the following technical effects: 1) sharing of active power and reactive power proportionally to the capacity of distributed energy resources (DERs) of the MG; 2) power unbalance compensation at the point of common coupling (PCC or PAC in Portuguese); 3) the process can be implemented without knowing the parameters and topology of the power grid; 4) ability to handle the arbitrary connection of inverters in the MG; 5) it makes possible to distinguish between DERs connected to the MG in both types of connection: phase-phase and phase-neutral, wherein single-phase DERs connected arbitrarily between the phases share the amounts of balanced power, while the unbalanced and homopolar powers are steered only to the inverters connected between phase and neutral; 6) it allows the connection of the MG to multiple PCCs and also the operation in isolated mode (“islanded”). The technology is applied in the technical field of equipment and infrastructure for the development of MGs.

The invention relates to a new energy-containing power grid optimal splitting section searching method based on branch transient potential energy, which comprises the following steps: acquiring power grid data, inputting the power grid data into a generator node potential energy model, and acquiring a potential energy time sequence of nodes in each generator; k-Means clustering based on Euclidean distance is carried out on the potential energy time sequence, a same visual coding color system is given to a generator potential energy time curve of a coherent group according to a clustering result, and power grid constraints are further set; and calculating branch potential energy indexes of all branches, searching an initial solution by taking the minimum branch potential energy index as a target function, uniformly converting power grid constraints into penalty terms by adopting a BBO-TS algorithm, fusing the penalty terms into the target function, and searching an optimal splitting section in a feasible region. According to the invention, the operation environment of the new energy unit after splitting is improved, and the island voltage and frequency stability after splitting is improved.

The invention discloses a concrete stirring refrigeration energy efficiency optimization control method and system, and relates to the field of stirring refrigeration control, and the method comprises the steps: firstly, carrying out the thermodynamic analysis of the environment temperature and humidity and the real-time load of a water chilling unit, and determining a cooling water temperature dynamic search space with the environment wet bulb temperature as the lower limit; on the basis, estimated power consumption of a cooling tower fan and a water chilling unit compressor at different cooling water temperature points is simulated by utilizing a dual-equipment energy consumption response prediction model, and a golden temperature point capable of enabling the total power consumption of the system to reach the minimum is positioned through global optimization. And finally, with the global optimal set temperature value as a target, the frequency of the fan is adjusted through PID control. According to the scheme, island type control logic is broken through, environmental potential and equipment characteristics are deeply fused, the energy consumption game relationship between the fan and the compressor is balanced in real time, and it is ensured that the refrigerating system always keeps the optimal comprehensive energy efficiency of the whole system under changeable climates and loads.

The invention relates to a power management device (1) integrating a network input (3); a local area network power interface (5); an islanding switch (7); an uninterruptible power supply (9); a central controller (10); at least one industrial battery (11); at least one bidirectional electric vehicle charging station (12) (13) connected to the industrial battery (11) so that the industrial battery (11) can be used to charge the electric vehicle (13) and, when an electric vehicle (13) is plugged in with sufficient charge, a battery of the electric vehicle can be used to charge the industrial battery (11); a grid shaping inverter (14) so ​​that the power management device can operate in an islanding mode in which the industrial battery (11) and / or the electric vehicle battery (13) supply the power interface (5).Figure for the abridged version: Fig 1.

The invention provides a power distribution system island division and fault reconstruction method and system. The method comprises the steps of obtaining a topological structure, load characteristic data and renewable energy output characteristic data of a power distribution system, and generating a mathematical model of the power distribution system; performing optimization calculation based on a mixed meta-heuristic algorithm framework and an adaptive step length gradient descent method; performing fuzzy binning processing on the optimization result to obtain a calibrated reconstruction optimization result; and finally, carrying out island division and fault reconstruction based on a calibration result. According to the method, the uncertainty influence of renewable energy sources can be effectively processed, and the accuracy and reliability of island division and fault reconstruction of the power distribution system are improved.

This invention discloses a RUSBoost islanding detection method applied to DC microgrids. Specifically, it involves: collecting historical data of electrical characteristics under both grid-connected and islanded states to form an unbalanced dataset; using the historical data as a training set and preprocessing it to form a training sample set; constructing a weak islanding classifier based on classification and regression decision trees; evaluating the model's correctness using a confusion matrix; and establishing a RUSBoost-based islanding detection model; applying the constructed RUSBoost-based islanding detection model to the microgrid system to classify grid-connected and islanded states based on real-time voltage and current data. This invention applies an ensemble classification algorithm from machine learning to DC microgrids, solving the problems of slow detection speed and low accuracy of existing detection methods.

The invention relates to the technical field of power system recovery control, in particular to a power grid black-start system and method based on cascade hydroelectric characteristics, and the method comprises the steps: constructing a software and hardware integrated system integrating physical equipment and intelligent control; situation awareness is carried out through the software and hardware integrated system, a power failure range after large-area power failure of a power grid is automatically identified, available cascade hydropower stations are positioned, and a black start plan is automatically triggered; the central decision-making unit simultaneously instructs a plurality of upstream hydropower stations to start units according to a preset rule so as to establish a plurality of independent power islands; after the frequency and voltage of each power island are stabilized, power is supplied to a next-stage transformer substation or power station in parallel, and partition collaborative recovery is carried out; dynamically distributing a load to be recovered, and performing synchronous parallel operation by using real-time phase angle difference data provided by a synchronous phasor measurement unit (PMU); and carrying out synchronous parallel operation on a plurality of subsystems which are stably operated, and gradually expanding a power grid architecture.

The invention discloses a non-communication power equalization method and system for a network-construction-type inverter parallel system, and relates to the field of network-construction-type inverter control design. The objective of the invention is to solve the problems of non-uniform reactive power distribution during parallel operation of a plurality of grid-forming inverters in an island micro-grid and poor dynamic response and low reliability caused by dependence on PCC point voltage measurement or continuous communication in an existing scheme. The method does not need to collect PCC point voltage and continuous communication, after each inverter records initial reactive power, through two steps of virtual impedance disturbance detection matched with the capacity ratio, total reactive power and expected reactive power are deduced by calculating reactive power variation, and then virtual impedance is corrected in real time through integral adjustment, so that the reactive power is accurately equally divided according to the capacity ratio. The system reliability is improved; and the cost is reduced.