Southeast University

Guannan Lou

Wei Gu

Suyang Zhou

Ge Cao

Wei Liu

Zhi Wu

Jun Wang

Ming Chen

Shuai Lu

Shuai Xue

Yinqiu Hong

Xiaoyu Jiang

Shanlin Li

Quan Yang

Lina Sheng

A method for designing a distributed communication topology of a micro-grid based on network mirroring and global propagation rates includes the following steps: first, determining the communication connectivity of distributed directed networks in the micro-grid; next, obtaining, for connected directed communication networks, mirror networks thereof based on a mirroring operation, and selecting an optimal distributed directed communication topology corresponding to a maximum performance indicator based on algebraic connectivity and communication costs; solving, for the optimized distributed communication topology, pinned distributed generation sets corresponding to different pinning numbers based on global propagation rates and out-degrees; and finally, establishing a distributed secondary voltage control of the micro-grid based on the optimal distributed communication network and pinned nodes of the micro-grid, to achieve accurate reactive power sharing and average voltage restoration.

Method for designing distributed communication topology of micro-grid based on network mirroring and global propagation rates

Disclosed is an integrated energy system operational optimization method considering thermal inertia of district heating networks and buildings, comprising the following steps. Step: respectively establish a district heating network model considering transmission delay and heat loss and a building model considering thermal storage capacity. Step: establish an integrated energy system optimization model consisting of a combined cooling, heat and power system model, the district heating network model and the building model. Step: solve the integrated energy system optimization model to obtain an optimal scheduling plan, control outputs of a gas turbine and a gas boiler per hour according to the optimal scheduling plan, and purchase electricity from a power grid and a wind power. According to the method, both the district heating network and buildings are included in a scheduling scope, so that the load adjustment with multiple degrees of freedom can be achieved.

Integrated energy system operational optimization method considering thermal inertia of district heating networks and buildings

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

Growing community of inventors

Nanjing, China

Guannan Lou