METHOD FOR RELAY GENERATION OF NETWORK CURRENTS IN A THREE-PHASED BRIDGE-BASED NETWORK INVERTER Russian patent published in 2008 - IPC H02M5/453 H02M7/21 H02P27/04 

FIELD: electric engineering, possible use in network inverters included in composition of electric motors of constant and alternating current, in electro-technical plants.

SUBSTANCE: method for relay generation of network currents includes cyclic switching of two modes of operation at the frequency of activation of relay regulator. The current for each phase is generated by corresponding phase relay regulator in accordance to the setting which is determined for each phase from a formula, provided in the formula of the invention. Current amplification mode in corresponding network phase is achieved by activation of transistor of anode or cathode group of current phase, collector-emitter direction of which transistor coincides with current setting direction of given phase. To reduce current in network phase, control impulses are not injected into transistors. Closure circuit in consumption and recuperation mode is altered. According to the method, the amplitude for setting effective value of network current is generated on basis of condition of equality of effective power at the input and the output of the network inverter according to the law, which is provided in the formula of the invention. Diodes and transistors of the network inverter participate in generation of network currents. Duration of current flow through diodes and current flow through transistors is determined by speed of reduction and speed of increase of current in corresponding phase of network, which differs for energy consumption and energy recuperation modes. In energy consumption mode, the current through network inverter diodes dominates, and in recuperation mode - the current through transistors.

EFFECT: improved shape of current which is consumed from the network and injected into network, possible management of reactive power consumed from the power system.

2 cl, 10 dwg