浮式电站黑启动方式下谐波影响因素及其表征

doi:10.12096/j.2096-4528.pgt.22085

摘要/Abstract

摘要：

浮式电站使用静止变频器对浮式电站机组进行黑启动时，由于运行于孤网系统且电气结构受限，产生的谐波影响相比于陆上电站更加严重。对于浮式电站黑启动过程中产生的谐波与其影响因素之间的关系，目前还缺少理论研究。为此，对浮式电站黑启动过程谐波影响因素及其表征进行研究。首先，建立了浮式电站黑启动过程的等值电路；其次，基于等值电路对谐波表达式进行推导分析，得到谐波畸变率关于其影响因素的表达式，进而提出一种谐波影响因素的表征参数——谐波作用系数，并探讨了谐波作用系数的物理意义及应用；最后，通过仿真算例验证分析谐波畸变率和谐波作用系数的关系，得到二者正相关的结论，表明了谐波作用系数的合理性和有效性。

关键词: 浮式电站, 黑启动, 谐波影响因素, 表征参数, 谐波作用系数

Abstract:

When floating power stations use static frequency converters to black-start floating power station units, the harmonic effects are more serious than onshore power stations due to the isolated grid system and the limited electrical structure. There is still a lack of theoretical research on the relationship between the harmonics generated during the black start process of floating power stations and their influencing factors. Firstly, the equivalence circuits on the black-start process of floating power stations were presented. Then, the mathematically analysis of harmonics was carried out on the basis of equivalence circuits, and the expression of the total harmonic distortion on its influencing factors was obtained. Furthermore,a characterization parameter of harmonic influencing factors, namely harmonic interfere coefficient, was proposed, and the physical meaning and application method of harmonic interfere coefficient were discussed. Finally, a simulation example was used to analyze the relationship between the total harmonic distortion and harmonic interfere coefficient. It is concluded that the harmonic interfere coefficient is positively correlated with the total harmonic distortion, which shows the rationality and effectiveness of the harmonic interfere coefficient.

Key words: floating power station, black start, harmonic influencing factors, characterization parameter, harmonic interfere coefficient

中图分类号:

TM 711

刘仲康, 王西田, 赵正宇, 熊江跃. 浮式电站黑启动方式下谐波影响因素及其表征[J]. 发电技术, 2022, 43(6): 843-850.

Zhongkang LIU, Xitian WANG, Zhengyu ZHAO, Jiangyue XIONG. Harmonic Influencing Factors and Their Characterization Under Black Start Mode of Floating Power Station[J]. Power Generation Technology, 2022, 43(6): 843-850.

图/表 9

图1 浮式电站黑启动系统拓扑结构图

Fig. 1 Topological structure diagram of black start system for floating power station

图2 浮式电站黑启动等值电路

Fig. 2 Black start equivalent circuit of floating power station

图3 浮式电站黑启动仿真模型

Fig. 3 Black start simulation model of floating power station

表1 仿真模型参数设置

Tab. 1 Simulation model parameter setting

参数	数值
PCC处额定电压/kV	6.3
换流变压器漏抗/pu	0.18
盘车转速/(r·min^-1)	300
点火转速/(r·min^-1)	600
SFC退出转速/(r·min^-1)	2 100
SFC功率P_SFC/MW	0~3.0
短路容量S_sc/(MV·A)	15/30/60/150

图4 黑启动过程SFC输出功率曲线

Fig. 4 Output power curves of SFC during black start

图5 黑启动过程THD曲线

Fig. 5 THD curves during black start

图6 不同PSFC对最大THD的影响

Fig. 6 Impact of different PSFC on maximum THD

图7 短路容量和THD的变化关系

Fig. 7 Relationship between short circuit capacity and THD

图8 HIC与THD的变化关系

Fig. 8 Relationship between HIC and THD

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