1. ISTCMTM
  2. All Volumes and Issues
  3. Volume 86, no.4, 2025
  4. METHOD FOR DETERMINING THE PERMISSIBLE POWER OF HYBRID INVERTERS FOR OPERATION IN ISOLATED SYSTEMS WITH SIGNIFICANT REACTIVITY

METHOD FOR DETERMINING THE PERMISSIBLE POWER OF HYBRID INVERTERS FOR OPERATION IN ISOLATED SYSTEMS WITH SIGNIFICANT REACTIVITY

ISTCMTM.
2025;
Volume 86(4), Number 4
: 64-73
https://doi.org/10.23939/istcmtm2025.04
Authors:
  1. Roman Hrytsak
  2. Vitalii Tsykh
1
Ivano-Frankivsk National Technical University of Oil and Gas
2
Ivano-Frankivsk National Technical University of Oil and Gas

The article presents an improved method for determining the permissible power generated by photovoltaic power plants, taking into account the influence of load and power converter parameters. The proposed approach is based on the construction of diagrams in active and reactive power coordinates (P-Q) with the allocation of areas of permissible and prohibited operating modes according to the criterion of total harmonic distortion of voltage. To verify the method, a series of mathematical simulations were performed in the MATLAB/Simulink environment, where a model of a hybrid PV power plant with an inverter, a storage battery, filter elements and a unit for measuring the main indicators of electricity quality was implemented.

The simulation results showed that the shape of the diagram of permissible operating modes depends on the parameters of the LCL filter and the nature of the load (resistive, capacitive or inductive). It has been established that the existing technical limitations of inverters specified by manufacturers do not always allow compliance with regulatory requirements for the level of harmonic distortion, which confirms the need to improve control algorithms and filtration mechanisms. A comparison of the simulation results with the measurement data showed a high degree of correspondence, confirming the correctness of the proposed method.

The results obtained are of practical importance for the design and operation of microgrids where PV systems are the main source of power. The proposed method can be used as a basis for creating new or updating existing regulatory documents that regulate the requirements for electricity quality in the context of integrating renewable energy sources.

Photoelectric system; harmonic distortion; MATLAB/Simulink model; voltage distortion; higher harmonic filtering; mathematical modelling; method; power quality; power limitation; photoelectric power station; harmonics.
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