基于阻抗的新能源接入的受端电网暂态电压失稳高风险故障快速筛选方法

doi:10.19595/j.cnki.1000-6753.tces.231728

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Abstract

The receiving-end power grid interconnected with large-scale new energy lack reactive power support from local conventional generators, so that transient voltage stability problems are particularly prominent, easy to cause grid blackout. However, existing transient voltage stability analysis methods are mainly based on time-domain simulations, and most of these methods have large computational volume and high complexity, which are not fast enough to locate the critical fault point in time in the actual power grids. On the other hand, most of the existing studies related to locating critical fault points of power grids utilize graph-theoretic concepts to construct indexes. Although these methods are faster in computation, most of them lack relevant physical meanings, making it difficult to accurately identify the critical fault point of the actual large power grid.
In view of this, this paper analyzes the degree of influence of points on the transient voltage stability of the grid based on the weighted topology and transient parameters of the grid, combined with the impedance matrix, in order to quickly screen high-risk fault points. Specifically, firstly, an index reflecting the degree of influence of node faults on the transient voltages of power grid (degree index, also the point influence factor, F_AC) is proposed, which can be used for fast screening of high-risk critical fault points; secondly, for the line fault points, an ascending matrix is constructed to calculate their F_AC, and the point influence factor array forms a screening method for the whole grid of high-risk critical fault points with high transient voltage instability risk; lastly, the above screening method is applied to the improved IEEE 39 bus test system and the actual receiving-end grid.
In the improved IEEE 39-bus system, firstly, the F_AC of the bus nodes are calculated, and it is concluded that bus 16 has the highest F_AC of 0.3500, and the indexes are compared with the average minimum voltage (U_AVL) of the grid under fault and critical clearing time (CCT) to prove its validity; secondly, the F_AC of the equivalent buses on the line are calculated, and it is found that the F_AC in the line is not the highest, and the color rendering of the system shows the area around the bus 16 has a higher level of risk; furthermore, the effects of load characteristics and fault types on F_AC are also considered; finally, the computational efficiency of the screening methods is analyzed and compared. In the actual large receiving-end grid, the F_AC of the buses are calculated, and it can be seen that the F_AC of the TZ, OH and NY are higher, which are 0.325 8, 0.303 9 and 0.294 3, respectively, and the simulation results also proved that these nodes play a key role in the transient voltage stability of the whole grid.
The main work and conclusions of this paper are as follows: 1) this paper attributes the change of voltage during transient process to the change of impedance based on the supporting role of impedance on voltage, and accordingly proposes the F_AC; 2) this paper puts forward a way of thinking to construct the ascending matrix in order to calculate the F_AC of the line fault point and summarize it as a fast screening method for the critical fault point; 3) Simulation results show that the proposed F_AC index can effectively reflect the degree of influence of fault point on the transient voltage, and the screening method using the F_AC can quickly screen the high-risk faults and visualize the results, which has a certain degree of engineering practicability, and can provide a theoretical basis for the subsequent development of security & control strategies.

Key words： Transient voltage critical fault points impedance matrix branch addition method

Received: 17 October 2023

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TM711

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	Yang Jinzhou
	Li Yecheng
	Xiong Hongtao
	Kong He
	Xue Ancheng

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Yang Jinzhou,Li Yecheng,Xiong Hongtao等. A Fast Screening Method for the High-Risk Faults With Transient Voltage Instability in Receiving-End Power Grids Interconnected with New Energy Based on Impedance[J]. Transactions of China Electrotechnical Society, 0, (): 1728-1728.

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