Operation Boundary Analysis of Multi-energy Complementary Systems Considering the Uncertainties of Distributed Generations

The randomness and uncertainties of distributed generations (DGs) increase the probability of voltage violation and power flow violation. It requires some adjustment and control measures to avoid out-of-limit situations. Hence, to improve the operational security and reliability of the multi-energy complementary systems with DGs, it is necessary to conduct operation boundary analysis in the operational planning of multi-energy complementary systems. In this paper, the zonotope-based uncertainty analysis method is used to analyze and calculate the operation boundary of the multi-energy complementary systems, and the influence of DG uncertainties on the steady-state characteristics of the multi-energy complementary systems is also studied. The prospects of the proposed method are carried out by the simulation studies of a 59-node distribution network system with CCHP (Combined Cooling Heating and Power) unit. Simulation results show that the proposed method can describe the correlation between voltage magnitudes of any two different nodes. Thus, the influence of DG output on the node voltages could be analyzed under different uncertainty levels.