异构新能源多馈入系统静态电压稳定机理与量化分析

doi:10.19595/j.cnki.1000-6753.tces.242028

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Abstract

With the rapid increase in the integration of heterogeneous new energy sources into the power grid, significant changes have occurred in the voltage stability characteristics and stability boundaries of the system. This shift has presented new challenges for power system stability. In response, this paper proposes a power flow mathematical model tailored for multi-feed-in systems incorporating heterogeneous new energy sources, focusing on the characteristics of voltage stability boundaries. Additionally, a method is introduced to quantitatively assess the static voltage stability of these systems under varying operational conditions.
First, the two-stage reactive power voltage response characteristics of grid-forming power sources are analyzed. By employing nonlinear constraints, the decoupling of the control system and power flow relationship is achieved. This analysis reveals the node type conversion behavior of grid-forming power sources. As a result, identifies the critical conditions for their voltage support capability and operational boundaries.
Secondly, a singularity criterion is developed from the self-feedback characteristics of the system power flow Jacobian matrix. This criterion allows for a comprehensive quantification and analysis of both the power delivery capacity and the voltage stability characteristics of the centralized and the distributed heterogeneous new energy multi-feed-in systems.
Finally, the paper investigates key factors that influence the static voltage stability of multi-feed-in systems, considering both system architecture and control methods of renewable energy. Simulation results are presented to validate the accuracy and effectiveness of the proposed analysis method.
The main contributions of the paper are as follows: (1) The voltage support capability of network-type power sources has certain boundaries, primarily influenced by the limitations imposed by the controller's clipping mechanisms. Additionally, when the voltage support capability reaches its boundary, the node type of network-type power sources will change from a PV node to a PQ node. (2) The transmission capacity of renewable energy is affected by different control strategies and operational conditions. Replacing a single grid-following station with a network-type station can improve the transmission capacity by approximately 30%. Moreover, distributed integration of renewable energy stations into the system offers enhanced transmission capacity compared to clustered integration scenarios. (3) In practical conditions, a multi-feed-in renewable energy system may become unstable before reaching the system's static voltage stability critical point. This characteristic becomes more pronounced in multi-machine, multi-feed-in systems with high renewable energy penetration. (4) The limit of the renewable energy station's transmission power exhibits a negative feedback relationship with the transmission distance and a positive feedback relationship with the voltage clipping value within the network-type power source. However, increasing the upper limit of the modulation stage will simultaneously expand the domain of system instability.

Key words： Static voltage stability multi-infeed power systems heterogeneous new energy system Jacobian matrix

Received: 12 November 2024

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TM721

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	Wang Tong
	Xiao Yihan
	Fan Zixuan
	Wang Zengping
	Tian Xin

Cite this article:

Wang Tong,Xiao Yihan,Fan Zixuan等. Static Voltage Stability Mechanism and Quantitative Analysis of Heterogeneous New Energy Multi-infeed Systems[J]. Transactions of China Electrotechnical Society, 0, (): 258101-258101.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.242028 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/258101

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