Optical storage direct current coupling control circuit and related apparatus

An optical storage direct current (DC) coupling control method, applied to an optical storage DC coupling control system, the optical storage DC coupling control system being connected to a Direct Current-Alternating Current (DC-AC) module, a Direct Current-Direct Current (DC-DC) module, and a plurality of photovoltaic systems, the method comprising:

• acquiring actual output power of the photovoltaic systems and an output power demand value of the DC-AC module;
• calculating, according to the actual output power and the output power demand value, AC voltages and DC voltages when output power of the DC-AC module reaches the output power demand value under a plurality of different bus voltage setting values, the AC voltages being AC-side output voltages when the DC-AC module reaches maximum conversion efficiency, and the DC voltages being charging voltages of an energy storage module connected to the DC-DC module when the DC-DC module reaches maximum conversion efficiency;
• determining, according to the different bus voltage setting values and the AC voltages and the DC voltages under the different bus voltage setting values, a target bus voltage value, a target AC voltage value, and a target DC voltage value when the energy storage module reaches maximum charging power;
• and
• controlling the plurality of photovoltaic systems, the DC-AC module, and the DC-DC module to perform output correspondingly according to the target bus voltage value, the target AC voltage value, and the target DC voltage value.

An optical storage direct current (DC) coupling control system, comprising:

• a processor;
• and
• a memory storing programs or instructions that, when executed by the processor, cause the processor to:
• acquire actual output power of a plurality of photovoltaic systems connected to the optical storage DC coupling control system and an output power demand value of a Direct Current-Alternating Current (DC-AC) module coupled to the optical storage DC coupling control system;
• calculate, according to the actual output power and the output power demand value, AC voltages and DC voltages when output power of the DC-AC module reaches the output power demand value under a plurality of different bus voltage setting values, the AC voltages being AC-side output voltages when the DC-AC module reaches maximum conversion efficiency, and the DC voltages being charging voltages of an energy storage module connected to a Direct Current-Direct Current (DC-DC) module when the DC-DC module reaches maximum conversion efficiency, the DC-DC module being connected to the optical storage DC coupling control system;
• determine according to the different bus voltage setting values and the AC voltages and the DC voltages under the different bus voltage setting values, a target bus voltage value, a target AC voltage value, and a target DC voltage value when the energy storage module reaches maximum charging power;
• and
• control the plurality of photovoltaic systems, the DC-AC module, and the DC-DC module to perform output correspondingly according to the target bus voltage value, the target AC voltage value, and the target DC voltage value.