A Novel Inertia Delay Optimization Control Strategy for New Power Systems Based on Crisscross Optimization

doi:10.11930/j.issn.1004-9649.202312029

Abstract

Abstract:

The power system, traditionally dominated by synchronous generators, is evolving into a new power system where virtual synchronous generators (VSGs) take the lead. This transition results in significant changes in the system's dynamic characteristics. Currently, most literature focuses on analyzing the dynamic behaviors of standalone or multi-machine grid systems based on an assumption of infinite power supply, with limited research on the dynamic characteristics of new power systems dominated entirely by VSGs. Therefore, this study first builds a model of a three-machine, nine-node system where VSGs are the primary controllers and conducts transient simulations using differential equations. Subsequently, the crisscross optimization (CSO) algorithm is employed to optimize the inertia delay in the new power system. A comparison is made between the optimized control system and the non-optimized system. The results demonstrate that the optimized system exhibits reduced oscillation amplitude and shorter adjustment times after disturbances occur. Through simulations, the validity of the conclusions is verified.

Key words: three-machine, nine-node system, crisscross optimization (CSO), virtual synchronous generator (VSG), delay optimization, dynamic characteristics

Xue WANG, Lin LIU, Wendi LIU, Yanpeng ZHAI, Ling YANG, Fangyuan XU, Yan GAO, Jixin ZHANG. A Novel Inertia Delay Optimization Control Strategy for New Power Systems Based on Crisscross Optimization[J]. Electric Power, 2024, 57(7): 12-20.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202312029

https://www.electricpower.com.cn/EN/Y2024/V57/I7/12

Figures/Tables 10

Fig.1 Three-machine nine-bus system dominated by VSG

Fig.2 Topological structure of VSG

Fig.3 Circuit structure of VSG

Fig.4 Principle of delay control strategy based on CSO algorithm

Fig.5 Optimized control flowchart of new power system inertia delay based on CSO

Table 1 Parameters of new power system

参数		数值
P_VSG(p.u.)		1.0646, 1.6290, 0.8500
Q_VSG(p.u.)		0.7109, 0.6317, 0.3704
X_f(p.u.)		0.014
\|E₀\|(p.u.)		1.0200, 1.0190, 1.0152
δ₀(p.u.)		0.0145, 0.1166, 0.0409
ω₀(p.u.)		1, 1, 1
I_d0(p.u.)		1.0438, 1.5986, 0.8373
I_q0(p.u.)		–0.7191, –0.6610, –0.3765

Fig.6 Changes in dynamic characteristics of new power system

Fig.7 Frequency dynamic characteristic curves of three VSGs

Fig.8 Power dynamic characteristic curves of three VSGs

Fig.9 Inertia delay control and real-time control

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