Stabilization of critical transient processes in DVR systems and development of additive protection coordination logic

RELEVANCE of the study is driven by the growing share of sensitive electrical loads in low-voltage distribution networks, where deep voltage sags and voltage distortions lead to stoppages of technological processes, abnormal operating modes of power electronics, and improper operation of coordinated protection devices. A Dynamic Voltage Restorer (DVR) can restore the voltage waveform when these phenomena occur; however, during prolonged compensation under power-deficit conditions, the system may enter a limiting oscillatory mode. This disrupts the normal operation of protection devices and aggravates the transient response.

The AIM of the study is to develop a comprehensive approach to coordinating DVR control algorithms with the protection system by determining the system stability boundary and developing logic for a safe transition from the compensation mode to protective actions, taking into account the possibility of suppressing oscillations by tuning the compensator parameters.

METHODS include a mathematical model of the DVR and computer simulations in MATLAB Simulink for a series of deep voltage sags with parametric variation of the compensator to ensure system stabilization. Based on the data obtained on the compensation behavior, an additive interaction logic between the DVR and the selected protection systems is formulated for the primary and secondary system configurations.

RESULTS show that the derived relationships between the permissible compensation time and the sag depth and energy-storage parameters, as well as the identified indicators of approaching the limiting mode for different system tuning options, make it possible to eliminate the adverse effects of critical operating conditions when these findings are comprehensively implemented in the protection trip logic. At the same time, properly selected filtering parameters and other DVR subsystem settings can eliminate oscillatory processes.

CONCLUSION. The developed logic limits the negative impact of dynamic processes, generates a signal indicating an approach to the limiting mode, and initiates protective actions in advance before stability is lost. The obtained optimization results indicate the need for accurate calculation and proper selection of compensatory parameters, which makes it possible to ensure a fully controlled exit from the compensation mode, reduce oscillations and the risk of unintended protection trips, and thereby reduce the negative impact on the load.

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