| The development and utilization of renewable energy power generation technology has become an inevitable requirement for the construction of new energy systems.The development of new energy power generation technology based on wind and solar energy is becoming increasingly mature.The networking of power electronic converters is a typical feature of most new energy generation equipment,which leads to its lack of response to system frequency changes.And with the increase of the penetration rate of new energy generation,the frequency stability of the power system will inevitably decline.Therefore,it is an important subject for the sustainable and large-scale development of new energy power generation to study the inertia characteristics of the connection between new energy equipment and the power grid,and propose that new energy power generation equipment actively participate in the system frequency regulation control strategy.Based on the primary frequency regulation control strategy of single equipment,a stationlevel wind/photovoltaic power station actively participates in the frequency regulation control strategy of power system,analyzes the interaction between the inertia response of large new energy equipment participating in the system and traditional power generation equipment,and proposes an optimized control strategy.In the research of typical new energy networking power generation equipment,the mathematical model and control strategy of doubly-fed wind turbine and monopole photovoltaic power generation equipment are studied,and corresponding simulation models are established.The principle of traditional synchronous generator unit participating in system inertia response and primary frequency modulation is discussed,the inertia response characteristics of new energy generation equipment are analyzed,and the optimal control strategy of primary frequency modulation is proposed.In terms of the primary frequency regulation of the new energy participation system,according to the wind situation,two appropriate load shedding control strategies are adopted for the doubly-fed wind turbine,and the control link of the photovoltaic power generation inverter is improved,so that the wind power/photovoltaic equipment can participate in the primary frequency regulation of the system in the case of load shedding backup.At the same time,in order to solve the complex tuning problem of the frequency modulation coefficient in the primary frequency regulation process of different new energy stations participating in the system,Moreover,due to the different frequency regulation capabilities of each equipment,the frequency regulation resources in the station can not be reasonably used.Relying on the actual new energy station network structure,a new energy station-level two-level frequency modulation control system has been established to realize the unified transfer and hierarchical consumption of wind energy and solar energy frequency modulation resources and reduce the phenomenon of power abandonment.A large-scale wind farm/photovoltaic power station networking system has been built in the time domain simulation software,and the optimization effect of this strategy has been verified through simulation examples.Similar to the inertia response principle of traditional synchronous generator sets,the inertia characteristics of two typical new energy equipment connected to the power system through power electronic equipment-double-fed wind turbines and monopolar photovoltaic power generation equipment under different phase-locked loop parameters are analyzed,and the impact of wind power generation equipment participating in the system inertia response on traditional synchronous generator sets is analyzed,and the optimal control scheme is proposed,It provides an analytical basis for studying the inertial response characteristics of new power system after large-scale access of new energy equipment. |
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