Energy Storage Configuration Method and Coordinated Operation Strategy Based on Wind Power Frequency-Regulation Characteristics

doi:10.12204/j.issn.1000-7229.2022.01.011

Abstract

Abstract:

Large-scale wind power connected to the power grid leads to the decrease of inertia response capacity and frequency-regulation reserve capacity of the power grid, and then the frequency stability of power grid is decreased. A method for energy storage (ES) configuration helps wind power units to provide the same inertia response capacity as equal capacity synchronous generator is proposed. The aim is to realize that the inertia response capacity of the grid and the overall frequency-regulation capacity of the system remain unchanged before and after wind power units instead of the synchronous generator connecting with the grid. On this basis, wind power units have different frequency-regulation ability under different wind speeds. Furthermore, a coordinated control strategy of combined wind and storage system is proposed, which can not only provide inertia response support at low wind speeds, but also assist wind power units to recover their rotating speed at medium wind speed to avoid secondary frequency drops. The simulation results show that energy storage with the capacity equalled to only 5% of the rated power of the wind farm can compensate the inertia response capacity of the power grid, as well as the power needed to restore the wind power units’ speed, which greatly improves the operation frequency stability of the power grid.

Key words: wind turbine(WT), inertia response, frequency regulation, energy storage configuration, coordinated control

CLC Number:

TM715

CHEN Changqing, LI Xinran, YANG Yang, LIU Xiaolong. Energy Storage Configuration Method and Coordinated Operation Strategy Based on Wind Power Frequency-Regulation Characteristics[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(1): 96-103.

Figures/Tables 14

Fig.1 Frequency-regulation model of thermal power unit

Fig.2 Schematic diagram of wind power units participating in frequency-regulation system

Fig.3 Equivalent model of energy storage and frequency-regulation in a single regional power grid

Fig.4 Frequency-regulation coordinated control strategy of combined wind power and energy storage system

Fig.5 Frequency-regulation control block diagram of combined wind power and energy storage system

Fig.6 Dynamic frequency-regulation model of regional power grid for thermal power units

Fig.7 Frequency-regulation dynamic model of regional power grid with energy storage

Fig.8 Amplitude-frequency characteristic curve of regional power grid

Fig.9 Amplitude frequency characteristic curve of regional power network load fluctuation

Table 1 Similarities and differences in the influence of ES configuration in different scenarios

Fig.10 System simulation model

Table 2 Grid model parameters

Fig.11 Simulation analysis at low wind speed

Fig.12 Simulation analysis at middle wind speed

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