Abstract
It is important to improve the dynamic performance and the low-voltage ride-through (LVRT) capability of a grid-connected photovoltaic (PV) system. This paper presents synergetic control for the control of a grid-connected PV system. Modeling of a grid-connected PV system is described, and differential-algebra equations are obtained. Two control strategies are used in normal operation and during LVRT of a PV system. Practical synergetic controllers with two control strategies are synthesized. The mathematical expressions are derived for computing control variables. The design of the synergetic controllers does not require the linearization of the grid-connected PV system. A grid-connected PV system with synergetic controllers is simulated in Simulink surroundings. The control performance is studied in normal operation and during LVRT. Simulation results show that the synergetic controllers are robust and have good dynamic characteristics under different operation states.
Highlights
The world is faced with serious problems of energy depletion and environmental pollution
This paper presents a design for the synergetic controllers for an internal current control loop of a three-phase gridconnected PV system
The design of a synergetic controller does not require the linearization of the PV system
Summary
The world is faced with serious problems of energy depletion and environmental pollution. A grid-connected PV system mainly includes maximum power point tracking (MPPT) and the control of the DC-AC converter. Reference [7] improves P&O algorithm This approach combines ant colony optimization with the traditional P&O method to yield faster and efficient convergence. This improved P&O algorithm can recognize global MPP under partially shaded conditions. A new MPPT algorithm is proposed in [8] This scheme uses a gray wolf optimization technique to track the global peak of a PV array under partial shading conditions. Reference [13] presents a new adaptive PI controller using the continuous mixed p-norm (CMPN) algorithm for enhancing the LVRT capability of gridconnected PV systems. The synergetic control is chatter-free, and the simulation results demonstrate the effectiveness of the proposed control schemes
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