5 results about "Active power flow" patented technology

The application relates to a method and device for scanning a predicted fault applied to an element of a power system, a computer device, a storage medium and a computer program product, and relates to the technical field of power grid safety monitoring. The application can shorten the time of detailed power flow calculation and improve the efficiency of the predicted fault scanning. The method comprises the following steps: obtaining a node admittance matrix and an active power flow total increment of an element to be detected under a predicted fault condition; obtaining a voltage phase angle increment corresponding to each bus in the element to be detected according to the node admittance matrix and the active power flow total increment; obtaining an active power flow increment of a current branch according to a first voltage phase angle increment, a second voltage phase angle increment and a current reactance value of the current branch for each branch in the element to be detected; determining a weight coefficient and a power flow limit value of the current branch; and inputting the active power flow, the weight coefficient and the power flow limit value into a preset severity index operation model to obtain a predicted fault severity index when the current branch is disconnected.

The application discloses a method and system for improving structural controllability of a power system, and belongs to the field of structural controllability optimization of a power system, which comprises the following steps: taking a generator, a transformer substation and a power consumption unit as a node, taking a power transmission line as an edge, the direction of the edge being consistent with the active power flow direction of the power transmission line, establishing an original network model of the power system, deleting the incoming edges of the generator nodes in the original network model to obtain a power network, solving the maximum matching of the power network, merging the edges with the same nodes in the maximum matching to obtain a matching path set and a matching circle set, marking the paths with the generator nodes as starting points in the matching path set as control paths, marking the remaining paths as uncontrollable paths, adding a directed edge between the terminal point of the control path and the starting point of the uncontrollable path, and adding a power transmission line between the nodes corresponding to the added edges. The application makes the power system structurally controllable only when the generator nodes are used as driving nodes, and effectively improves the structural controllability of the power system.

This application relates to a location method, program product, and related equipment for a grid-type static var generator (SVR). The method includes: acquiring multiple sets of candidate schemes, each set including several location nodes; calculating the total power supply capacity connected to each location node, obtaining the annual maximum active power flow and values ​​of multiple preset indicators for each location node; determining the weight coefficients of each preset indicator in the corresponding location node based on the annual maximum active power flow and total power supply capacity; calculating the location base number of the corresponding location node based on the preset indicator values ​​and weight coefficients; selecting several location nodes sequentially in descending order of the location base number as candidate nodes; calculating the average location base number of the corresponding candidate schemes; and selecting the candidate node in the candidate scheme with the highest average location base number as the final location target. This invention, by connecting the grid-type SVR to the location target, can improve grid stability to meet grid operation requirements.

The application discloses an active power flow adjusting method, device and equipment for an AC-DC distribution network, which is characterized in that: the actual active power vector of a converter station is calculated by using the rated voltage of a DC system and the parameters of the converter station, the connection node of the DC system converter station is equivalent to an AC load node, and the actual active power vector of an AC system node is solved, so that the steps of the whole adjusting process are simple, the data does not need to be iteratively processed, the solving speed is fast, and the adjusting efficiency of the active power flow of the AC-DC distribution network is improved.

The application discloses an environmental protection gas ring main unit fault isolation and recovery control method for a power distribution system and relates to the technical field of power distribution automation.The fault isolation method comprises the following steps of S01: collecting three-phase voltage and current instantaneous values of a current feeder interval access point by an intelligent terminal of the feeder interval, determining a disturbance direction by calculating a power disturbance direction parameter, and determining that the disturbance active power flows from a bus to a line if the disturbance active power flows from the bus to the line.Through synchronous collection of three-phase voltage and current instantaneous values, extraction of positive sequence components, calculation of a power disturbance direction parameter based on power changes before and after the disturbance, and determination of whether disturbance energy flows from a bus to a line or from a line to a bus, the method eliminates, in principle, the problem of healthy branch mis-isolation caused by overcurrent discrimination failure due to distributed power reverse current, realizes accurate identification and selective removal of a fault section of a power distribution network containing a distributed power, and significantly improves the accuracy of fault isolation and power supply reliability.