一种双级式储能变流器

• Format: Patent
• Language: Chinese
• Published: 15.12.2023
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

本发明涉及一种双级式储能变流器，包括前级复合谐振型DAB变换结构，NPC型三电平逆变结构，LCL滤波结构，其复合谐振型DAB变换结构的原边侧谐振开关电容单元与串联双谐振型DAB单元复用一组桥臂；前级复合谐振型DAB变换结构和后级NPC型三电平逆变结构复用一组支撑电容。本发明的双级式储能变流器，无需增加控制回路，即可实现双侧直流电容电压自均衡，降低了系统控制的复杂度，能有效降低开关器件电压应力，提升运行可靠性；该双极式变流器能满足输出电压范围极宽的储能并网需求，可广泛应用于新型电力系统、风电场、光伏电站等储能接入场景；且谐振开关电容单元和支撑电容进行了开关器件复用设计，降低了系统成本。