| 摘要 |
<p> It is difficult for a modularized islanding operation detection device to acquire the phase difference between the AC voltage of a system power supply and an AC signal outputted from a PLL. An islanding operation detection device, provided with: a frequency change amount acquisition unit for acquiring the amount of change in the frequency of the system voltage of a system power supply; a transfer function acquisition unit for acquiring a transfer function representing the response characteristics of a phase change in a reference AC signal of a power conditioner in response to a change in the frequency of the system voltage; a phase difference estimation unit for sequentially estimating the phase difference, which is the difference between the phase of the system voltage and the phase of the reference AC signal, from the acquired amount of change in frequency and the transfer function; a planned value calculation unit for calculating a planned value relating to new output power for reducing the error in the output power of the power conditioner based on the estimated phase difference; and an output unit for outputting the calculated planned value relating to the output power to the power conditioner.</p> |
