Research On Capacity Configuration And Control Strategy Of Flywheel Energy Storage Auxiliary Generator Set Participating In Frequency Modulation

With the emphasis of global energy security and environmental pollution problems,the goal of "carbon peak,carbon neutrality" has gained global recognition.Countries around the world are committed to transforming energy production and consumption to clean and low-carbon.Wind power,photovoltaic and other en vironment-friendly renewable energy have inevitably become the main energy component of the new power system.The instability and randomness of renewable energy resources pose threats to the safe and stable operation of the power grid.Energy storage technology is quickly becoming a solution to these problems.Energy storage technology has significant practical implications for peak load shifting,large-scale exploitation of new energy,frequency security,and stability support as a crucial component of the future new power system.The flywheel energy storage system(FESS)has the benefits of sensitive reaction,extended service life,superior equipment safety,and multiple states of charging and discharging when compared to the conventional battery energy storage system(BESS).In recent years,with the gradual maturity of flywheel energy storage technology,the number of projects with FESS auxiliary frequency modulation has gradually increased,and the market-oriented application of FESS has broad prospects.Thus,it is important from a practical standpoint to conduct research on the control strategy and capacity configuration of the FESS participating primary frequency control.Firstly,a primary frequency modulation model of conventional power grids considering boiler inertia is established,including thermal power unit models,DEB coordinated control system,and FESS model.The simulation model is used to examine the dynamic properties of thermal power units’ primary frequency regulation.The primary frequency regulation ability of conventional units under different pressure operation modes is simulated and analyzed.It is found that the real-time state of main steam pressure has a great influence on the primary frequency regulation ability of units.Secondly,an adaptive coordinated frequency regulation control technique is developed based on the real-time output prediction model of thermal power units to adaptively modify the flywheel power in accordance with the real-time output of thermal power units.The FESS can actively make up for the lack of frequency regulation ability of units under dynamic conditions according to the real-time frequency regulation ability of units,and provide effective support for grid frequency security.The simulation results demonstrate that the cooperative frequency modulation control technique can successfully reduce the output variation of the thermal power unit while also effectively enhancing the active frequency support capability of the power generating side.Finally,based on economic factors,a capacity optimization configuration model for auxiliary frequency regulation of FESS is established.The economic model considers the life cycle cost of FESS and related frequency regulation benefits,particle swarm optimization algorithm is used to optimize the results.On the basis of the capacity allocation model,the capacity allocation results under different energy storage operation control strategies are obtained.The capacity configuration model’s initial investment cost and frequency regulation income parameters are subjected to sensitivity analysis,.and the frequency regulation effect under the capacity configuration result is verified.