Abstract
The pumped storage power station has the characteristics of frequency-phase modulation, energy saving, and economy, and has great development prospects and application value. In order to cope with the large-scale integration and intermittency of renewable energy and improve the ability of pumped storage units to participate in power grid frequency modulation, this paper proposed a load frequency control (LFC) strategy for pumped storage units based on linear active disturbance rejection technology. Firstly, based on the operating characteristics of the pumped storage power station, the LFC model of the two-area reheat steam turbine under nonlinear conditions such as governor dead zone and generation rate constrains was established. Secondly, a second-order linear active disturbance rejection control (LADRC) was designed. The feasibility and control performance of the proposed LFC system were quantitatively analyzed through simulation. The results show that the LADRC has better control effect and stronger robustness than fractional-order proportion integration differentiation (FOPID) and traditional proportion integration differentiation (PID) controller. Finally, the pumped storage power station was added, and it was found that it has better correction performance under both generating and pumping operations, which greatly improved the dynamic response of secondary frequency modulation.
Highlights
With the gradual depletion of traditional primary energy sources such as coal and oil, energy issues have become increasingly prominent and have become the focus of current power systems.Green renewable energy has obvious volatility and intermittent
The majority of scholars at home and abroad have proposed different advanced control methods for load frequency control (LFC), such as load frequency predictive control with wind power connection, sliding mode control, robust control based on linear matrix inequality (LMI) and delay marginal estimation, fuzzy control, LFC based on differential game theory, etc
An LFC method for a pumped storage unit based on linear active disturbance rejection control (LADRC) is proposed
Summary
With the gradual depletion of traditional primary energy sources such as coal and oil, energy issues have become increasingly prominent and have become the focus of current power systems. Pumped storage units have the characteristics of rapid start and stop, flexible operation adjustment, and the application research and practice in power grid frequency-phase modulation have attracted common attention at home and abroad. Reference [8] analyzed the application effect of Taiwan’s power system using pumped storage units to assist conventional hydropower in participating in grid frequency adjustment. In [17], a two-layer ADRC control method with estimated equivalent input disturbance compensation is proposed for liner frequency modulation (LFM) control of multi-region interconnected power systems, which is capable of resisting random load changes and parameter uncertainties. In order to effectively suppress grid frequency fluctuations and provide safe, stable and reliable power for power grids and users, this paper proposes an LFC strategy for pumped storage power stations based on active disturbance rejection technology.
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