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Minimal-order observer-based coordinated control method for isolated power utility connected multiple photovoltaic systems to reduce frequency deviations

Minimal-order observer-based coordinated control method for isolated power utility connected multiple photovoltaic systems to reduce frequency deviations

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Published

In this study, a simple coordinated control method based on minimal-order observer is proposed for multiple photovoltaic (PV) systems. Here, output power command is generated in two steps: central and local. In the central step, a minimal-order observer estimates load power. Then, load variation index is calculated by subtracting the average of estimated load power from the instantaneous estimated load power. From the available maximum PV power, base PV power is produced by using a low-pass filter and is added with the load variation index to generate the central PV output power command. In the local step, a simple coordination is maintained between the central power command and the local power commands. The proposed method is compared with the method where maximum power point tracking control is used for each of the PV systems. Simulation results show that the proposed method is capable of reducing the frequency deviations of the power utility and also delivers power near maximum PV power.

Inspec keywords: power system stability; photovoltaic power systems; load flow control; power generation control; observers

Other keywords: load variation index; minimal-order observer estimates load power; central power command; isolated power utility; local power command; frequency deviation reduction; multiple photovoltaic systems; low-pass filter; minimal-order observer-based coordinated control method

Subjects: Solar power stations and photovoltaic power systems; Power system control; Control of electric power systems

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