基于一致性理论的直流微电网多电力弹簧分布式电压平稳控制方法

Distributed Consensus-based Voltage Regulation Control of Multiple DC Electric Springs in DC Microgrid

针对直流微电网高比例可再生能源的功率波动和直流电力弹簧(DC electric spring,DCES)参数摄动对系统电能质量的影响,提出一种简单的多DCES分层控制策略,实现直流母线电压平稳与关键负载的可靠运行。下层控制设计基于DCES开关模态的模型预测方法(model predictive control,MPC),建立以快速跟踪电感电流期望轨迹为目标的系统评价函数,实现各段直流母线电压波动的快速平抑。上层控制采用一致性算法动态调节直流电压母线参考值,同时求取下层控制器所需的电流期望轨迹,仅需本地信息和相邻信息即可实现多DCES的协调控制和直流母线电压平稳控制,闭环控制系统的全局稳定性可由Lyapunov稳定性定理证明。基于MATLAB/Simulink的仿真结果和基于dSPACE的实验结果验证了所提出方法具有动态响应快、稳定性好、鲁棒性高的特点。

Considering the power quality influence caused by the power fluctuate of high penetration of renewable energy sources in DC micro-grid and the parameters'perturbation of DC electric spring(DCES),a simple distributed control method of multiple DCESs was proposed to regulate DC bus voltages and ensure reliable operation of critical loads.A model predictive control(MPC)based on the DCES switching modes was applied in the primary control layer.An evaluation function was established to achieve the fast tracking of the desired trajectory of DCES inductance current and the voltage fluctuation of each local DC bus could be suppressed quickly.A consensus-based control algorithm was adopted in the secondary control layer to offer the proper reference bus voltages for the distributed DCESs and obtain the desired inductance current trajectories required by the primary controllers.The consensus algorithm only needs local and neighbors'information to achieve the coordinated operation of multiple DCESs and DC bus voltage regulation.The closed control system stability in sense of Lyapunov theorem was guaranteed.The simulation results based on MATLAB/Simulink and the experimental results based on dSPACE verified the proposed method had fast dynamic response,good stability and strong robustness.