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This paper theoretically analyzed and established the state-space mathematical model of the single-stage three-phase PV converter with LCL filter, and proposed a design procedure of the pole-assignment control method based on state feedback and repetitive controller of current regulation. Additionally, the MPPT is realized by using improved P&O method with adaptive step algorithm, furthermore...
Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to make full utilization of the PV array output power which depends on solar irradiation and ambient temperature. Among all the MPPT strategies, perturbation and observation (P&O) and hill climbing methods are widely applied in the MPPT controllers due to their simplicity and easy implementation. In this paper,...
Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to make full utilization of PV array output power which depends on solar irradiation and ambient temperature. Among all the MPPT strategies, the incremental conductance (INC) algorithm is widely used due to the high tracking accuracy at steady state and good adaptability to the rapidly changing atmospheric conditions...
LCL filter offers a better choice of attenuating switching frequency harmonics, since compared with L or LC filters the value of required inductance is smaller. But LCL filter may cause resonance which is a disaster for the systempsilas stability. In order to solve the problem, a two-current-loop control strategy which includes grid-current outer loop and filter-capacitor-current inner loop is used...
Stand- alone photovoltaic systems have solved power supply in the many remote areas. Inverter is the key component of photovoltaic system. By paralleling several mid/low-power inverter units to compose a large power supply system, both the capability and the reliability of power supply system can be enhanced. The circumfluence among parallel inverter in PV is the key reason for preventing the parallel...
Islanding of photovoltaic (PV) systems may cause a variety of problems and must be avoided. Phase shift techniques is a good solution because it has high effective and costless in implementation. Optimal design of Phase shift techniques to certify the required anti-islanding Standard and grid quality is a challenge problem. This paper analysed the frequency deviation of PV systems after grid is disconnected...
Voltage source converters (VSC) are widely used in the distribution generation (DG) systems for the conversion of renewable energies. These converters are usually connected to the utility grid through a simple L filter to reduce the current harmonics injected to the grid. A LCL network, which can achieve reduced levels of harmonic distortion at low switching frequencies with less inductance, is a...
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