Abstract: The present invention provides a method and system of self-adaptive setting of closed-loop parameters for suppressing PV coupling harmonics, comprising: acquiring node voltages and node currents of PV grid-connected inverters; constructing harmonic coupling admittance matrix according to the node voltages and node currents; calculating an amplitude of each element in the constructed harmonic coupling admittance matrix; screening contribution sources of coupling harmonics according to the calculated amplitude of the each element; evaluating quantitatively harmonic admittance of the PV grid-connected inverter according to screened contribution sources; and, carrying out optimization iteration for double-closed-loop PI control parameters of inverter with objective of minimizing the coupling harmonics of the PV grid-connected inverter according to results of the quantitative evaluation of the harmonic admittance, to complete self-adaptive setting of closed-loop parameters for suppressing PV coupling harmonics.

Abstract: A fast-response photovoltaic (PV) simulator based on an improved deadbeat predictive current control (DPCC). Compared to actual PV modules, there is a response time at the output of the PV simulation. Currently widely used PV simulation have a long response time, which cannot meet the performance testing requirements of high-performance grid-connected PV inverters. Based on the energy balance of the inductor during the absorption and dissipation phases, the current control law of the output inductor in the PV simulation was studied in a single switching period, thereby establishing the required DPCC model. An integral compensation eliminates the steady-state error in current tracking caused by nonlinear factors such as time delay and mismatched parameters, enabling its wide application in engineering. For the proposed PV simulator, the transient response time can be reduced to 1.1 ms and significantly shorter than widely used PV simulation.

Abstract: The present invention relates to a flight time exchange system and a corresponding method. The method includes the following steps: S1: obtaining a flight time exchange request or a flight time exchange requirement of at least one flight; S2: generating a candidate flight time exchange list based on content of the flight time exchange request or the flight time exchange requirement, where exchangeable flight times are sorted in the list according to a given rule; S3: sequentially performing exchange negotiation with flights having target flight times based on the candidate flight time exchange list; and S4: when information that a flight time exchange is accepted is obtained, determining a flight time exchange result, and publishing the flight time exchange result to flights between which a time exchange is performed. The invention can also predict the requirement of exchange, produce multi-to-multi exchange project and perform the exchanging automatically.