METHOD FOR MONITORING LOW-VOLTAGE POWER GRID BASED ON ACCEMS Russian patent published in 2023 - IPC H02J13/00 G01R11/24 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering and can be used for operational monitoring of 0.4 kV power grids. The technical result is an expansion of the functionality of the current automated commercial electricity metering system (ACCEMS) with the ultimate goal of reducing electricity losses, in particular, identifying and localizing points of uncontrolled consumption (UC) of electricity on the circuit, identifying consumer phases, accurate control of technically justified losses taking into account the temperature dependence of the resistance of wires, monitoring currents and voltages of all network elements. It is achieved by creating a network model based on a priori information about its circuit, lengths and parameters of wires. On entry into the network the average voltage and ambient temperature are measured at the metering interval synchronized with the system time of the ACCEMS. Based on the readings of the ACCEMS, the averages are calculated at the interval of accounting for consumer power and at the network input. The actual power imbalance is calculated as the difference between the input power and the sum of the consumer capacities. According to the readings of power and voltage at the network input, the current of the head section is calculated. The consumer currents are determined numerically and technically justified losses in the network are calculated, taking into account the dependence of the resistance of the wires on the ambient temperature and the flowing current. Calculate the discrepancy of the power imbalance of the network as the difference in the actual unbalance and technically justified losses. The detection of the fact of UC is fixed on the basis of the current imbalance. In order to localize UC points and identify consumer phases, measurements and calculations are repeated at multiple time intervals. The current imbalance is alternately added to each node of the network model and the corresponding power imbalance residuals are calculated. The desired UC point will correspond to a network node for which the power imbalance discrepancy in the entire statistical sample is minimal. The identification of consumer phases is performed on the basis of calculating the correlation coefficients of time series of phase capacities at the input and at consumers. After eliminating the UC and identifying the phases of consumers, current control of technically justified losses, average currents, voltages and temperatures of wires is carried out.

EFFECT: expansion of the functionality of the current automated commercial electricity metering system (ACCEMS).

1 cl, 4 dwg