The PV works in power limit mode, and the output current of the PV is reduced by controlling the boost converter. According to the photovoltaic I–V characteristic curve, the output voltage of the PV increases as a result and moves further away from the maximum power point.
The deviation between the inverter’s power-limiting value and the photovoltaic output power under the action of the proportional–integral (PI) controller can change the duty cycle of the boost converter, which can reduce the photovoltaic output power within 1 s. The principle of this method is simple, but the response speed is relatively slow.
In 2021, household PV contributed 21.6 GW of new installed capacity, accounting for 73.8 % of the new installed capacity of distributed PV. However, due to the randomness and intermittency of PV power generation, large-scale household PV grid connection has a serious impact on the safe and stable operation of the distribution network.
The PV is composed of identical photovoltaic modules to provide active power for the system. The output voltage and current of the PV are sensitive to external factors (temperature, illuminance), and the output characteristic curve is nonlinear.
Each photovoltaic module had an open circuit voltage of 37.5 V and a short-circuit current of 11.1 A. The maximum power point voltage and current were 30 V and 10 A, respectively. The number of PV series-connected modules per string was 10, and the number of parallel strings was 1.
During the period from 18:00 to 23:00, residential load demand is completely provided by energy storage. At 24:00, the stored energy is exhausted. The load demand from 1:00 of the next day to 5:00 of the next day is completely provided by the power grid. As the Fig. 22 shows, in summer, the PV equipment starts to output at 5:00 a.m.
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BYD Releases Solar Power Solutions for Household – …
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Power Limit Control Strategy for Household Photovoltaic and …
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