23 results about "Reverse power flow" patented technology

The invention provides a power distribution network partitioning method and device, equipment and a storage medium. The method comprises the steps that firstly, a node voltage-reactive power sensitivity matrix and historical operation data of a distributed power supply are obtained, the structural distance between nodes is calculated, the historical data are normalized, the attribute similarity is obtained in combination with an attribute weight matrix, and the two are added to generate an electrical distance. Resolution parameters are dynamically adjusted according to reverse power flow intensity, and the parameters are increased when the power flow is enhanced to refine clusters. According to the method, the limitation that traditional partition depends on geographical proximity or simple parameters is broken through, accurate partition is achieved by quantifying electrical coupling and resource characteristics, the problem of poor connection in the cluster is solved, the on-site consumption capacity of new energy is effectively improved, the transmission pressure of a main network is reduced, and the method is suitable for large-scale popularization and application. And meanwhile, the fault recovery capability and the calculation efficiency of the power grid are enhanced, and the method is suitable for district power balance optimization in a high-permeability distributed power supply access scene.

The invention discloses a regional main transformer reverse heavy overload-oriented power distribution network collaborative reconstruction regulation and control method. The method comprises the steps of optimizing feeder reverse power flow based on matrix monitoring and optimal distribution, constructing a feeder power flow state matrix, an adjustable equipment state matrix and an adjustable weight matrix, and performing power optimal distribution on the reverse power flow; main transformer cooperative power transfer control is implemented according to main transformer operation state identification and power adjustment margin calculation; and establishing a power distribution network reconstruction multi-objective optimization model fusing feeder line reverse power flow management and main transformer cooperative power transfer, and solving through a second-order cone programming relaxation technology. The invention provides an effective main transformer reverse heavy overload treatment scheme, and through collaborative optimization of the network topology and the local regulation and control strategy, the main transformer reverse heavy overload level is significantly reduced, the network loss is reduced, the absorption capability of the power distribution network to the distributed power supply is improved, and the power distribution efficiency is improved. The problem of stable operation of the power distribution network under the background of high-proportion distributed new energy access is solved.

The application discloses a V2G charging station control method and system based on reverse power flow suppression, equipment and a medium, relates to the technical field of power distribution network operation control and vehicle-to-grid interaction, and comprises the following steps: taking reverse power flow suppression as a priority, considering the active power, reactive power and vehicle SOC dynamic problems of the charging and discharging unit, constructing a station rolling optimization model, calculating the set values of the active power and reactive power of each charging and discharging unit according to the station rolling optimization model; when the power reverse sending at the point of common coupling is over the limit, the absorption task is allocated based on the fair weight and the reverse sending over-limit amount, and the active power set value is adjusted. By taking the suppression of the PCC reverse power flow as a priority and guaranteeing the operation target of the power distribution network and the station, the station rolling optimization model of the V2G charging station is constructed, the power quality, equipment life and operation compliance are guaranteed, the absorption task is proportionally allocated among the charging and discharging units according to the fair weight, the station-level power is ensured to return to the permitted interval in time, and the solving capacity and response speed for sudden disturbances are improved.

The application provides a primary and secondary fusion column circuit breaker protection adjustment method, comprising: collecting voltage phase data and current waveform data from three-phase positions of a bus in real time, obtaining photovoltaic grid-connected point output proportion and reactive power injection amplitude sequence during low voltage ride through, and reading current district photovoltaic penetration from a district configuration file; according to the voltage phase data and the reactive power injection amplitude sequence, correcting phase offset of each period according to the change rule that reverse power flow gradually increases with the increase of output during photovoltaic output climbing, calculating the initial discrimination range of the maximum sensitivity angle of the directional element; taking the corrected discrimination angle width as an effective window for phase comparison, comparing the current bus voltage phase with the reactive power injection amplitude, identifying the phase pullback phenomenon caused by low voltage ride through, and extracting the phase swing characteristics of the bus voltage.

The invention provides a frequency stability control method and system for a pulse load ship electric isolated network, and the method comprises the steps: constructing an energy flow map of the ship electric isolated network, and configuring an isolated network shock wave transmission model; when a pulse load is detected, the model is used to predict the diffusion of a frequency energy shock wave, and a reverse power flow for dissipating the shock wave is reversely calculated. A pulse load node is used as a space focus, and a beam forming algorithm is used to decompose the reverse power flow into original power instructions added with phase delay parameters and distributed to a plurality of distributed energy storage units. And performing time domain shaping on each original power instruction through an inertia damping control model for simulating physical characteristics, generating a target power instruction with a stress relaxation attenuation characteristic, and driving and executing the target power instruction. According to the invention, the compensation power of the plurality of energy storage units is focused on a disturbance source in space, so that the technical problems of low frequency suppression efficiency and secondary oscillation caused by response lag and spatial non-focusing in a traditional control method are solved.

The application provides a millisecond-level prediction suppression method and equipment for reverse power flow in a light storage and charging collaborative scenario, and relates to the technical field of smart grids. The method comprises the following steps: collecting in real time through an energy management controller; predicting a grid connection point according to multi-source operation data flow in combination with the light storage and charging collaborative scenario; presetting a reverse power flow threshold value, comparing the reverse power flow threshold value with a grid connection point net power trend; grading according to a reverse power flow risk index, formulating a collaborative suppression decomposition scheme; and respectively issuing power control instructions to perform millisecond-level prediction suppression of the reverse power flow. The application solves the technical problem in the prior art that only real-time power threshold values are relied on for triggering judgment, there is a lack of advanced perception of the grid connection point power change trend, protection actions can only be performed after the reverse power flow occurs, there is control lag, and the safety and stability of power grid operation are affected. The application changes reverse power flow control from post-disposal to proactive prevention and collaborative optimization, and ensures the stability of power grid operation.

The invention relates to an anti-circulation loss control method and system for a distributed photovoltaic station. The method comprises the following steps: acquiring a tidal current direction of a transformer of the distributed photovoltaic station; judging whether the tidal current directions of the first transformer and the second transformer are consistent or not, and if not, calculating distributed photovoltaic power generation adjustment power which needs to be adjusted from the transformer side with the reverse tidal current direction to the transformer side with the forward tidal current direction; based on the distributed photovoltaic power generation adjustment power, adjusting an inverter at a transformer side with a reverse tidal current direction so as to eliminate the circulating current influence; the power flow direction of each line is monitored in real time, the distributed photovoltaic power generation power of each transformer is dynamically distributed through the control loop, the consistency of the power flow direction is realized, and the loss caused by circulating current is avoided.

The present application relates to a kind of double reference point adaptive OLTC voltage regulating method considering reverse tide flow, comprising: real-time acquisition data in power grid;Calculate the reference voltage of each node of each feeder;Select feeder;Double reference point weighted average measured voltage value and double reference point weighted average reference voltage are calculated;Adaptive determination OLTC voltage regulating dead zone and dynamic delay;Adjust OLTC voltage regulating gear;Cyclic execution, realize whole process closed-loop adaptive OLTC voltage regulating.The present application can simultaneously solve the reverse tide flow overvoltage caused by high penetration rate photovoltaic access and traditional forward tide flow low voltage problem, realize multi-feeder coordinated voltage control;Through optimizing existing main transformer load tap changer control logic, stable voltage regulation can be realized, significantly reduce the investment of voltage regulating equipment and power grid transformation cost, effectively suppress voltage out-of-limit, improve power grid photovoltaic receiving capacity and system operation stability, prolong the service life of OLTC equipment, have strong engineering practicability and economy.

The invention belongs to the technical field of power system load prediction, and particularly relates to a short-term load prediction method for a power distribution network, and the method comprises the following specific steps: carrying out the classified collection of load-related data and influence factor data; performing scale unification on data of different dimensions by adopting Z-score standardization; splitting the load data into three parts through a time sequence decomposition algorithm; according to the method, the three-layer logic of data missing, reverse power flow deviation correction through feature decoupling, sample enhancement and fault tolerance improvement through dynamic correction is solved through component repairing, and the core problems that a traditional method is high in data quality dependence, poor in fault tolerance and insufficient in deviation correction are comprehensively solved. The whole process is carried out by restoring real load characteristics, a closed-loop anti-interference design is formed from data acquisition to prediction output, and it is ensured that an accurate load prediction result can still be output even in the scenes of electric meter faults, communication interruption and frequent reverse power flow.

The present invention relates to a photovoltaic system, and more specifically, to a photovoltaic system capable of preventing backflow that can increase the convenience of management while avoiding power disturbance in the grid by adjusting the connection with each photovoltaic device when the amount of power generated by the photovoltaic device exceeds the power consumption of the load.

The application relates to a kind of graph theory-statistics joint modeling driven electric vehicle dynamic grouping control method, constructs graph theory-statistics joint driven vehicle network two-way interaction model;Subsystems are divided to distribution network, and based on multi-agent deep deterministic policy gradient algorithm, using centralized training, distributed execution framework, constructs two-stage series decision architecture, to solve distribution network electric vehicle grouping and distribution network active and reactive power joint optimization problem;In the first stage of series decision, the electric vehicles in each subsystem are adaptively grouped in real time, and in the second stage, active-reactive power joint optimization control is carried out based on the grouping result;A multi-dimensional space dynamic evaluation model is constructed to integrate time series fluctuation, voltage stability and reverse power flow constraints, and the maximum access capacity margin boundary of the photovoltaic grid-connected point is obtained by solving the evaluation model.Compared with the prior art, the method can improve the new energy margin of the distribution network node level, optimize the voltage and reduce the network loss.

To realize reverse power flow transmission without causing any disadvantages to consumers. [Solution] A reverse flow control unit executes reverse flow transmission, transmitting power stored in a storage battery used by a consumer to the power grid during a reverse flow period that satisfies a predetermined reverse flow activation condition; and a compensation processing unit performs compensation processing to waive the cost of the consumer purchasing power transmitted from the power grid during a compensation period, which is the period during which power is transmitted from the power grid to the consumer after the reverse flow transmission is executed and until the amount of transmitted power becomes equal to the amount of power transmitted to the power grid during the reverse flow period, and to provide the consumer with a predetermined incentive. The power control system is configured to include the following.

A dynamic Stand-Alone Power System (SAPS) formation optimization system is developed to facilitate resilience in large utility sites with complex networks connected to multiple substations. The system ensures uninterrupted power to critical loads during substation outages while preventing reverse power flow (RPF). The system intelligently reconfigures the network at the feeder level and optimizes distributed energy resources (DERs). Operating in two phases, it first continuously evaluates how to form SAPS islands by allocating DERs to critical loads under current constraints, proactively preparing for outages and mitigating RPF risks. Once SAPS islands are formed, the system monitors and reassesses their configuration to improve service to critical loads. This adaptive and proactive approach enhances reliability and resilience in power distribution, ensuring essential operations are maintained even during disruptions.

The invention relates to the technical field of direct-current power supply and distribution and electric energy management, and discloses a large-model high-computing-power server power supply side waste heat electric energy recovery system which is characterized in that a waste heat power generation unit converts heat into direct-current electric energy; the recovery power conversion unit performs power conversion and forms recovery electric energy; the anti-reverse-flow isolation unit blocks reverse flow of power from the direct current bus to the recovery power conversion unit; the recovery control unit is used for acquiring data information, acquiring a reverse current detection result and a grid-connected end voltage detection result, and executing disconnection isolation, pre-charging grid connection and recovery; when the first condition is met, the anti-backflow isolation unit is disconnected, and output of the recycled electric energy to the direct-current bus is stopped; in the recovery process, the redundancy margin is determined, and the target recovery power output with the maximum net income is selected; and estimating open-circuit voltage and equivalent internal resistance, and adjusting an optimization step length and a preset reverse current limit value. According to the invention, stable and controllable grid-connected operation of waste heat recovery is obtained on the premise that the reliability of power supply is not reduced.

The amount of reverse power flowing into the power transmission and distribution network when the amount of generated power exceeds the amount of consumed power is suppressed to below a specified value. [Solution] In the control unit 11 of the management server 10 that constitutes the reverse power flow control system, the acquisition unit 111 acquires information on a predetermined first amount of reverse power flow, a second amount of power generated by the power generation equipment, and a third amount of power discharged from the charge / discharge equipment that charges and discharges the power generated by the power generation equipment. The reverse power flow control unit 113 then controls the reverse power flow for each combination of the second and third amounts of power, based on the first, second, and third amounts of power.

The present application relates to a kind of distributed photovoltaic carrying capacity calculation method considering reverse power flow, belong to distribution network evaluation field, solve the problem of voltage out of limit, transformer capacity out of limit and distributed photovoltaic capacity evaluation safety due to reverse power flow.It includes generating typical day uncertainty scenario, calculating the probability of uncertainty scenario under each typical day of season;Establish transformer model and reversible sending capacity model under bidirectional power flow mode;Based on the probability of uncertainty scenario under each typical day of season, and transformer model and reversible sending capacity model, build distributed photovoltaic carrying capacity calculation model including with the minimum of distribution network annual comprehensive resource loss as objective function, and the constraint condition of corresponding ESS and SOP collaborative planning considering reverse power flow;Based on typical day uncertainty scenario data, one-dimensional search is used to solve distributed photovoltaic carrying capacity calculation model, and the distribution network distributed photovoltaic carrying capacity calculation scheme is obtained.The accurate calculation of distributed photovoltaic carrying capacity is realized.

The application provides a reverse current processing method, system, device and medium of a three-phase power distribution network, belonging to the technical field of energy storage control. The method is applied to an energy storage system including multiple energy storage devices and a three-phase electric meter, control instructions are issued to the nth energy storage device based on a preset detection sequence to increase the output power; in the case that the nth energy storage device receives the control instructions, the power change data of each phase of the grid side is obtained through the three-phase electric meter, and the access phase corresponding to the nth energy storage device is determined based on the power change data; after determining the access phase of each energy storage device, if a reverse current signal is detected, the energy storage device with the access phase being the reverse current phase is selected based on the corresponding reverse current phase, the reverse current processing strategy is determined, and the operating parameters of the corresponding energy storage device are adjusted. The method realizes accurate identification of the access phase of multiple energy storage devices and reverse current positioning, reduces the phase misjudgment rate, and improves the operating stability and control efficiency in the home energy storage and grid connection scenario.

We provide indoor panels that are less likely to cause reverse power flow. [Solution] The indoor panel 100 is connected to a charging device 200 that charges an electric vehicle V and is installed on the indoor side, and is equipped with a power outage detection unit 110 that detects a power outage based on the voltage supplied from a commercial power source P, a main breaker unit that is connected to the commercial power source P via the power outage detection unit 110, and a switch installed between the power outage detection unit 110 and the charging device 200, and when a power outage is detected, the switch is opened.

The embodiment of the invention discloses a voltage out-of-limit suppression method and system caused by access of a distributed power supply to a power distribution network, and the method comprises the steps: obtaining the active power of the head end of a feeder line of the power distribution network, and judging the operation state of the feeder line according to the direction and amplitude of the active power; starting a reverse reactive power support mode when the reverse power flow state is judged and the high-voltage side bus voltage of the upper-level transformer exceeds a preset upper out-of-limit threshold value; issuing a reverse reactive power absorption instruction to an inverter of the distributed power supply according to the priority sequence; according to the deviation between the actual reactive power absorption amount and the reactive power adjustment demand, performing rolling correction on the reactive power adjustment demand and the reactive power instruction distribution; and when the feeder power flow direction recovers to the forward power flow state or the high-voltage side bus voltage of the upper-level transformer is lower than a preset lower out-of-limit threshold value, exiting the reverse reactive power support mode, and controlling the distributed power supply inverter to recover to the local voltage control mode. According to the method, the accuracy, rapidity and robustness of voltage treatment under the reverse power flow working condition are remarkably improved.

The invention discloses a green electricity source tracing accounting method and system considering network loss allocation fairness, and the method comprises the following steps: collecting the operation data of a power grid, and constructing a data set; carrying out load flow calculation by adopting a Newton-Raphson method, and calculating the network loss of lines between different nodes; reverse power flow tracking is carried out, and power provided by the power generation node to the load node is calculated; a linguistic variable-based direct influence matrix is constructed for predefined influence factors, a comprehensive relation matrix is obtained through processing, the importance degrees of different influence factors are calculated, and the transmission loss proportion shared by the power generation side and the load side is determined and corrected; calculating the network loss borne by the load side on the corresponding line in combination with the network loss of the line; and calculating the green power consumption amount of the load node based on the power provided by the power generation node to the load node and the network loss borne by the load side. According to the invention, through combination of load flow calculation, network loss reverse tracking and fuzzy comprehensive evaluation, physical accuracy of network loss allocation and fairness and rationality of green power consumption amount accounting are realized.

The invention provides a novel power distribution system multi-scene risk situation assessment method. The method comprises the following steps: firstly, constructing a wind / light / load joint uncertainty model, and generating two typical scenes of conventional operation and N-k emergency by utilizing probabilistic power flow simulation; establishing a multi-dimensional risk index system considering voltage, thermal stability and power flow direction, and covering indexes such as voltage out-of-limit, voltage deviation, overload, load deviation, reverse power flow, N-1 passing rate and the like; data objective distribution characteristics are mined by adopting an entropy weight method, subjective experience of experts is reflected in combination with an analytic hierarchy process, and weights of all indexes are determined by constructing a subjective and objective combination weighting model; and calculating a comprehensive risk assessment value of the power distribution system and dividing a'safety-early warning-danger 'multi-level risk situation. According to the method, the small probability and high risk under high-load, high-permeability, conventional operation and N-k emergency complex scenes can be effectively identified, and quantitative support is provided for power distribution system operation mode optimization and weak link treatment.

The application discloses a low-voltage multi-terminal flexible interconnection coordination planning method for a new power distribution network for high-proportion distributed power consumption, equipment and medium, belonging to the technical field of power coordination planning, comprising: dividing the low-voltage network into transformer area clusters, calculating the boundary controllable injection capacity envelope of the transformer area cluster; according to the medium-voltage flexible interconnection skeleton and the medium-voltage network operation constraint, generating the boundary power quota for each transformer area cluster; determining the low-voltage multi-terminal flexible interconnection scheme, and constructing the reverse power flow controllable corridor; performing integrated constraint checking, and outputting the coordination planning result. The application improves the engineering consistency and implementability of the planning scheme as a whole, and reduces the dependence of subsequent operation side repeated adjustment and reinforcement.

[Problem] To provide an emergency power supply facility that is low in cost and easy to use, thereby enabling power failure countermeasures to be performed easily. [Solution] This power failure countermeasure set, to be attached to a distribution board 8, comprises: first main wiring 41 that connects a target branch circuit breaker 81 and a switch box 1; second main wiring 42 that connects the switch box 1 and a specific load 9; a portable storage battery 2 that is attached to the switch box 1; and a portable-type photovoltaic power generation panel 3. The portable storage battery 2 is charged by power supply from the target branch circuit breaker 81 at the time of non-power failure, and supplies power to the specific load 9 at the time of power failure. The portable storage battery 2 can also be charged by the portable-type photovoltaic power generation panel 3. The portable storage battery 2 is provided either with a reverse power flow prevention circuit, or a reverse power flow detection unit 60 and a cut-off unit 6.