Converter device and system

The utility model discloses a converter device and system, the converter device includes: converter module, converter module include the three parallelly connected first bridge arm that is used for carrying out the DCAC transform to the input electric energy each other to and be used for inputing at least one second bridge arm that the electric energy carries out the DCDC transform with first bridge arm is parallelly connected. The output of first bridge arm is connected to AC electric network, realizes the contravariant repayment of energy. Energy absorption is realized through connecting the energy-absorbing load to the output of second bridge arm, or energy storage is realized through connecting the energy storage load to the output of second bridge arm. The utility model discloses can enough realize can the mode of presenting and the function of energy storage mode coordination work, also can realize can the mode of presenting with the function that can inhale the mode coordination work, not only practiced thrift the design cost, also reduced the volume of equipment.