Frequency Regulation Control Strategy Based on Model Predictive Control for Combined PV and Energy Storage Power Station in New Power System

doi:10.12204/j.issn.1000-7229.2022.11.010

Abstract

Abstract:

The continuous increasing of penetration rate of photovoltaic power reduces the rotational inertia of the new power system and brings new challenges to the frequency stability of the system. Therefore, it is imperative to combine photovoltaic power and energy storage to form a combined PV and energy storage power station to participate in the frequency regulation of the new power system. The active power output of the combined PV and energy storage power station participating in the frequency regulation of the system is not only affected by the randomness and volatility of the photovoltaic output, but also limited by various output constraints. The ability to handle multiple constraints is also poor. In this context, this paper proposes a new frequency regulation control strategy based on model predictive control for combined PV and energy storage power stations in power systems. The control strategy aims to minimize the sum of the system frequency deviation and the rate of change of frequency, and takes into account the constraints of the active power output and total power generation of the combined PV and energy storage power stations to obtain the optimal active power output of the combined PV and energy storage power stations, and participate in the system frequency regulation by controlling the active power output of the combined PV and energy storage power stations. Finally, simulation examples verify that, the proposed method has a better effect in frequency regulation than the traditional control strategy, which can quickly and accurately determine the output of the PV and energy storage power station under the condition of considering multiple constraints, and improve the frequency stability of the system.

Key words: new power system, combined PV and energy storage power station, model predictive control, frequency regulation

CLC Number:

TM615

ZHAO Jingjing, ZHANG Yu, DU Ming, ZHU Jiongda, XU Hongyuan. Frequency Regulation Control Strategy Based on Model Predictive Control for Combined PV and Energy Storage Power Station in New Power System[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(11): 99-107.

Figures/Tables 9

Fig.1 The structure diagram of combined PV and energy storage power station

Fig.2 The framework of model predictive control

Fig.3 Frequency-regulation control flow of combined PV and energy storage power station

Fig.4 Change of PV active power output

Table 1 The simulation parameters

Fig.5 Frequency deviation in low inertia grid

Table 2 Frequency index under three control strategies

Fig.6 Active power output change of energy storage power stations

Fig.7 Active power output of energy storage system

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