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Keywords Dynamic saturation, harmonic compensation, multifunctional photovoltaic inverter and reactive power compensation. Abstract Single and three-phase photovoltaic inverters are essential components of the photovoltaic (PV) systems to extracting the PV power and injecting it into the grid. Thus, in order to extract the maximum power of the sola...
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Context 1
... control strategy is presented in Fig. 2. Generally, the dc/dc stage is responsible for the MPPT algorithm [24], which maintains the solar array delivering maximum power to the system at various levels of solar irradiance and temperature. The boost control strategy has a voltage control loop associated with a current control loop as shown in Fig. ...
Context 2
... control strategy is presented in Fig. 2. Generally, the dc/dc stage is responsible for the MPPT algorithm [24], which maintains the solar array delivering maximum power to the system at various levels of solar irradiance and temperature. The boost control strategy has a voltage control loop associated with a current control loop as shown in Fig. ...
Context 3
... control strategy is shown in Fig. 2b. The PI compensator calculates the active current amplitude i that needs to be injected into the power system. This signal is synchronized with PCC voltage, resulting in a sinusoidal reference wave i . This current reference is added to the load harmonic and reactive current component, generating the inverter current reference i S . This current is saturated and compared with the inverter current i S tt. The next PI compensator calculates the converter modulation index v to set the converter switches pulses through the PWM ...
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Citations
The new generation of PV systems can have the capability to perform ancillary services in order to improve the power grid quality index. One of these services is the harmonic current compensation of nonlinear loads. An important issue to perform this service is the harmonic detection method. The traditional methods detects all harmonic contents of the load current and the control tuning tends to be complex and few flexible, especially if it is used resonant controllers, once the load harmonic contents are not well defined. Therefore, in the literature is proposed a detection method of the harmonic load current, which is frequency adaptive and able to detect the load harmonic current of higher amplitude. This method consists in two stages of second order generalized integrator structure with synchronous reference frame phase-locked loop (SOGI-PLL). The resonant controller is tuned with the detected frequency by this harmonic detector. However, adding others stages to detect more harmonic components can lead to steady state error during the harmonic current detection process, due to nonideal filter characteristic of the SOGI-PLL structure. For this reason, this work proposes an improvement in the harmonic detector in order to compensate more than one harmonic component The strategy is applied in a three-phase system. Simulation results show the performance of the proposed control strategy, improving significantly the grid current quality.
