Research On Real-time Simulation Of High Permeability And Distributed Renewable Energy Generation System

With the development of renewable energy sources,power-electronics-based power systems are becoming important components of electrical grids,such as renewable power plants,microgrids and electric railway systems,and a large number of non-linear loads have brought new challenges to the scheduling and design of power systems.Because of the limitation of scale and safe,it is difficult to test the power system in a real environment.Therefore,the modeling and simulation of a high-permeability power system,including distributed renewable energy,needs to be studied.In this paper,a detailed real-time simulation model of photovoltaic power generation unit is first constructed.Then,use FPGAs to simulate nanosecond simulation,like inverters and other fast-changing devices.And use CPUs to simulate microseconds simulation,included photovoltaic panels and voltage loop control.he current waveforms of the simulation has been compared to real inverters’ waveforms to verify the accuracy of the real-time simulation.Secondly,this paper proposes a method for calculating the annual power generation of the photovoltaic power generation unit based on the concentrated loss model by the accurate simulation of the photovoltaic power generation unit.Depending on the instantaneous output power of the inverter,the method uses a centralized equivalent model to simulate the loss of the inverter at different operation points.The required parameters are less,simple and accurate,and it does not increase the computational burden of the model.At the same time,the model considers the influence of power electronics devices parameters and controls on power generation.Thirdly,this paper establishes a power-station-level simulation platform.The simulation of distributed generation system based on ’ source-grid-load-storage’ integration multi-level cooperative is carried out by using the CPU microsecond level simulation.In this paper,a synchronous generator model is built to simulate the primary frequency modulation and two frequency modulation of the power system.Three kinds of load models,constant impedance,constant current and constant power are built to simulate the actual load characteristics.And the energy storage battery model and energy storage inverter model are built to verify the effect of energy storage to the stability of PV power plant.Finally,this paper builds a power-station-cluster-level simulation platform.Due to further expansion of the simulation scale,the simplified inverter model is proposed in this paper.The power electronic switching devices in the model are equivalently replaced by the controlled source,which reduces the consumption of simulation resources.After solving the problems of delay and decoupling of RT-LAB hardware platform,a power station cluster simulation model was established,and the common characteristics of the power system like reactive power loss allocation were verified.