Electrolytic system, electrolytic control circuit, and control method for electrolytic system

An electrolytic control circuit that controls, a plurality of converters each of the plurality of converters is configured to convert a first DC power received from a power generator into a second DC power according to a received target duty ratio, and output voltage information of the second DC power and current information of the second DC power, and a plurality of electrolyzers each of the plurality of electrolyzers is configured to receive the second DC power output from each of the plurality of converters and generate a gas, the electrolytic control circuit comprising:

• a control circuit configured to execute control processing every time a start signal is inputted, the control processing including:
• obtain a measurement value of the first DC power;
• output control information by which the first DC power output by the power generator approaches a maximum power, based on the obtained measurement value of the first DC power;
• in response to detecting that the measurement value at a present time is larger than the measurement value at a previous time, output the control information configured to cause a selection circuit to change the target duty ratio in a same direction as a changing direction at the previous time;
• and
• in response to detecting that the measurement value at a present time is equal to or smaller than the measurement value at the previous time, output the control information configured to cause the selection circuit to change the target duty ratio in an opposite direction as the changing direction at the previous time;
• and
• the selection circuit configured to output the target duty ratio, and a selection signal as to whether to select each of the plurality of electrolyzers and each of the plurality of converters, based on the control information output by the control circuit and the voltage information and the current information output by each of the plurality of converters.

A control method for electrolytic system including a power generator, a plurality of converters, a plurality of electrolyzers, a control circuit, and a selection circuit, the method comprising:

• converting, by each of the plurality of converters, a first DC power output by the power generator into a second DC power according to a received target duty ratio;
• outputting, by each of the plurality of converters, voltage information of the second DC power and current information of the second DC power;
• receiving, by each of the plurality of electrolyzers, the second DC power output from each of the plurality of converters;
• generating a gas, by each of the plurality of electrolyzers;
• executing, by the control circuit, control processing every time a start signal is inputted, the control processing including:
• obtaining a measurement value of the first DC power;
• outputting, by the control circuit, control information by which the first DC power output by the power generator approaches a maximum power, based on the obtained measurement value of the first DC power;
• in response to detecting that the measurement value at a present time is larger than the measurement value at a previous time, outputting the control information configured to cause the selection circuit to change the target duty ratio in a same direction as a changing direction at the previous time;
• and
• in response to detecting that the measurement value at a present time is equal to or smaller than the measurement value at the previous time, outputting the control information configured to cause the selection circuit to change the target duty ratio in an opposite direction as the changing direction at the previous time;
• and
• outputting, by the selection circuit, the target duty ratio, and a selection signal as to whether to select each of the plurality of electrolyzers and each of the plurality of converters, based on the control information output by the control circuit, the voltage information and the current information output by each of the plurality of converters.