Southeast University

Ge Cao

Wei Gu

Guannan Lou

Wei Liu

Suyang Zhou

Zhi Wu

Ming Chen

Shuai Xue

A decentralized voltage control method for a microgrid based on nonlinear state observers, comprising the steps of step), establishing a large-signal model of distributed generations, a connection network and impedance-type loads in the microgrid; step), establishing a Luenberger-like nonlinear state observer for each distributed generation; step), estimating the dynamic characteristics of other distributed generations in real time based on the local measured values of each distributed generation; and step), implementing the decentralized voltage control based on the control requirements of reactive power sharing and voltage restoration. The control method realizes the voltage control of microgrid based on the decentralized state observers, which does not rely on communication transmission or remote measurement and avoids the adverse effects of communication latency and data drop-out on the control performance.

Decentralized voltage control method for microgrid based on nonlinear state observers

The invention discloses a general distributed control method for multi-microgrids with both PQ controlled and droop controlled distributed generators, which comprises the following steps of: step) conducting primary control to maintain the power balance of the multi-microgrids; step) determining predefined group consensus values of pinned agents; step) seeking group consensus among other agents and the pinned agents through communication coupling; and step) adjusting output powers to complete secondary control. Based on pinning control, the control method which adopts hierarchical control is a distributed control method for distributed power supply clusters with two control modes comprising PQ control and droop control. The method obviates the requirements for a central controller and complex communication topologies, reduces the number of the controllers, can be adapted to the communication topology changes in the multi-microgrids, and meets the plug-and-play requirement for the distributed power supply.

General distributed control method for multi-microgrids with PQ control and droop control

A distributed predictive control based voltage restoration scheme for microgrids, comprising: step 10) adopting a distributed finite time observer to acquire the global reference voltage for restoring the voltage of each local controller; step 20) each local controller adopts a droop control to acquire the local voltage value of each generation, and adds a secondary voltage compensation term into the droop characteristic formula to form the voltage reference value of a distributed generation; step 30) establishing a trended prediction model; step 40) acquiring a predictive control term at a current time as the secondary voltage compensation command, and acting on the local controllers; and step 50) determining, whether the local voltage of each distributed generation of the microgrid reaches the voltage reference value under the secondary voltage compensation command.

Distributed predictive control based voltage restoration scheme for microgrids

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Nanjing, China

Ge Cao