Reverse flow power control device and reverse flow power control method

A reverse flow power control method that prevents occurrence of reverse flow power from a plant having a renewable energy power generating device, a power conditioner capable of adjusting output power of the renewable energy power generating device, and a load device, and connected to an external power system, to the power system, the reverse flow power control method comprising:

• an external information accepting step in which an input unit accepts actual values of the output power, load power supplied to the load device, and reception power received by the plant from the power system, and information including a minimum reception power value being a minimum value of the reception power, and a storage unit stores the information;
• a command value calculation step in which an output controller calculates an output command calculation value, and a load controller calculates a load command calculation value, based on the information and the respective actual values housed in the storage unit;
• an output command value re-calculation step in which a command value re-calculator calculates, by using the respective actual values, the output command calculation value, the load command calculation value, and the minimum reception power value, an output command value with respect to the power conditioner, in order to prevent a reception power value being a value of the reception power from becoming less than the minimum reception power value;
• and
• an output step in which an output unit outputs the command values to the load device and the power conditioner,
• wherein:
• the output command value re-calculation step includes:
• a step by a calculation interval adjustment part of setting a calculation interval of generating a plurality of calculation steps, regarding a dead time in the renewable energy power generating device, the power conditioner, and the load device;
• and
• a step by the command value re-calculator of calculating a change in the reception power value in an interval up to an end of the plurality of calculation steps in which a command value is reflected by the dead time, and calculating the output command value that prevents the reception power value from becoming less than the minimum reception power value.