A power controller for a hybrid power system, the power controller comprising: a common DC bus having a DC voltage; at least one energy converter electrically coupled between an electrical energy generating device and the common DC bus, each energy converter including: a voltage signal corresponding to the DC voltage present on the DC bus; at least one DC energy storage device; and an energy regulator electrically coupled between the DC energy storage device and the common DC bus, wherein the energy regulator includes: a voltage signal corresponding to the DC voltage present on the DC bus, characterized in that the or each energy converter includes a control unit configured to control energy conversion between the electrical energy generating device and the common DC bus independently of any other converters, and the energy regulator includes a control unit configured to control energy conversion between the DC energy storage device and the common DC bus independently of the or each converter and to maintain the DC voltage at a substantially constant value. a common DC bus having a DC voltage; at least one energy converter electrically coupled between an electrical energy generating device and the common DC bus, each energy converter including: a voltage signal corresponding to the DC voltage present on the DC bus; at least one DC energy storage device; and an energy regulator electrically coupled between the DC energy storage device and the common DC bus, wherein the energy regulator includes: a voltage signal corresponding to the DC voltage present on the DC bus, characterized in that the or each energy converter includes a control unit configured to control energy conversion between the electrical energy generating device and the common DC bus independently of any other converters, and the energy regulator includes a control unit configured to control energy conversion between the DC energy storage device and the common DC bus independently of the or each converter and to maintain the DC voltage at a substantially constant value. a voltage signal corresponding to the DC voltage present on the DC bus; at least one DC energy storage device; and an energy regulator electrically coupled between the DC energy storage device and the common DC bus, wherein the energy regulator includes: a voltage signal corresponding to the DC voltage present on the DC bus, characterized in that the or each energy converter includes a control unit configured to control energy conversion between the electrical energy generating device and the common DC bus independently of any other converters, and the energy regulator includes a control unit configured to control energy conversion between the DC energy storage device and the common DC bus independently of the or each converter and to maintain the DC voltage at a substantially constant value. a voltage signal corresponding to the DC voltage present on the DC bus, characterized in that the or each energy converter includes a control unit configured to control energy conversion between the electrical energy generating device and the common DC bus independently of any other converters, and the energy regulator includes a control unit configured to control energy conversion between the DC energy storage device and the common DC bus independently of the or each converter and to maintain the DC voltage at a substantially constant value.