Research on Operation Strategy of Virtual Power Plant and Distributed Control of DG

doi:10.12096/j.2096-4528.pgt.23041

Abstract

Abstract:

Objectives Virtual power plant is usually composed of distributed generator (DG). When the system lacks power grid support, practical and reasonable comprehensive operation strategies and accurate control methods are needed to ensure the smooth operation of virtual power plant. Methods An operation strategy based on system fluctuation value was proposed. Then, aiming at the problem of generation control of distributed generators in the system, a distributed finite-time controller was designed. The amplitudes of voltage and frequency were adjusted to nominal values within a finite time, and the active power was distributed among each DG unit. Different from the traditional centralized control strategy, the proposed control method is based on distributed junction, which only requires information exchange between adjacent DG units through sparse communication network. Results The feasibility of the proposed control method and its robustness to the uncertainty of model parameters and load variation were verified by simulation experiments. Conclusions Compared with previous studies, the proposed operation strategy divides the system operating conditions in more detail, effectively improving the stability and security of the system.

Key words: virtual power plant, operation strategy, primary control, secondary control, finite-time control

CLC Number:

TK 01

Guichao DUAN, Gong WANG, Shengxian CAO, Jie DUAN. Research on Operation Strategy of Virtual Power Plant and Distributed Control of DG[J]. Power Generation Technology, 2024, 45(4): 765-771.

Figures/Tables 11

Fig. 1 Interval partition of Nc

Fig. 2 Structure of primary control

Fig. 3 Structure of secondary control

Tab. 1 Parameters of the system

参数	数值
参数	DG₁	DG₂	DG₃	DG₄
m	1×10^-5	14×10^-5	1.8×10^-5	2.5×10^-5
n R_f/Ω L_f/mH C_f/F KPV KIV KPC	5×10^-4 1×10^-3 1.4 6×10^-5 0.1 120 7	8×10^-4 1×10^-3 1.4 6×10^-5 0.1 120 7	8×10^-4 1×10^-3 1.4 6×10^-5 0.1 120 7	9×10^-4 1×10^-3 1.4 6×10^-5 0.1 120 7
KIC	20 000	20 000	20 000	20 000

Fig. 4 Communication topology of DG

Fig. 5 Simulation results of frequency

Fig. 6 Simulation results of voltage

Fig. 7 Simulation results of active power

Fig. 8 Frequency under disturbance

Fig. 9 Voltage under disturbance

Fig. 10 Active power under disturbance

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