The principle of reactive power generation of photovoltaic inverter
This report first studies the structure of photovoltaic inverter, establishes the photovoltaic inverter model, including the mathematical model of photovoltaic array, filter and photovoltaic inverter system in different coordinates; builds a single-stage grid connected photovoltaic power generation system model based on MATLAB / Simulink .
This report first studies the structure of photovoltaic inverter, establishes the photovoltaic inverter model, including the mathematical model of photovoltaic array, filter and photovoltaic inverter system in different coordinates; builds a single-stage grid connected photovoltaic power generation system model based on MATLAB / Simulink .
To this end, we trained an ANN to learn a mapping between nodal loads and PV active powers (input) and optimal PV reactive powers obtained by solving standard ACOPF (output), i.e., replacing ACOPF with a less computationally expensive ANN to perform centralized control of reactive power in PV systems.
The key novelty is that the active/reactive power references are analytically calculated based on the dc-link voltage and grid codes, while they do not depend on the implemented current reference calculation algorithm and, as a general formulation, can be implemented in combination with various current reference calculation algorithms.
Furthermore, based on the inverter nominal current and the injected reactive power to the grid during voltage sags, an analytical algorithm is introduced for the calculation of the active power reference, which can be extracted from PV strings.
Based on the power transmission theory of power system, this paper analyses the causes of PCC voltage rise caused by grid connected photovoltaic power-generation system. A practical method of voltage regulation in photovoltaic system's coordinated control strategy of active and reactive power of inverter is proposed.
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