초록 ▼

A connectionless paralleling and load sharing system and method for power sources are presented. The invention provides a dynamic feedback adaptive control system that enables proper load sharing among paralleled power sources without the need for interconnection therebetween. Only the individual so

A connectionless paralleling and load sharing system and method for power sources are presented. The invention provides a dynamic feedback adaptive control system that enables proper load sharing among paralleled power sources without the need for interconnection therebetween. Only the individual source's voltage and current are sensed by its controller. These output parameters are then used to modify a reference voltage used by the controller to control the source's output waveform. This reference voltage compensation is accomplished through two feedback control loops, an outer loop for the voltage compensation and an inner loop for the current compensation. The outer loop includes an integration of the voltage error between the desired voltage and the actual voltage sensed at the source's output. The inner loop is filtered and operates in a proportional fashion to rapidly adjust the output. Through proper constant selection the control system and method of the invention provides load sharing control proportional to an individual source's power supplying capacity, i.e. on a per unit basis. This allows the use of supplies of different rating in a single paralleled environment. This system and method are particularly well suited for systems requiring uninterruptible power supplies.

대표청구항 ▼

1. A method of controlling a first electrical power source, the first electrical power source being in parallel operation with at least one other electrical power source to supply an electrical load, the method comprising the steps of:generating a desired reference voltage signal; sensing an output

1. A method of controlling a first electrical power source, the first electrical power source being in parallel operation with at least one other electrical power source to supply an electrical load, the method comprising the steps of:generating a desired reference voltage signal; sensing an output voltage generated by the first electrical power source; sensing an output current generated by the first electrical power source; and compensating the desired reference voltage signal with an integration of the sensed output voltage and a proportion of the sensed output current to maintain proper division of the electrical load on a per unit basis.