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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (11): 2305-2313    DOI: 10.3785/j.issn.1008-973X.2023.11.018
    
Grid strength analysis of hybrid multi-infeed HVDC system considering different control modes
Jun-xian JIANG1(),Qi-chao CHEN2,Fei WANG2,Yi-xin WANG1,Chen LI3,Guan-zhong WANG4,*()
1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
2. State Grid Economic and Technological Research Institute Co. Ltd, Beijing 102209, China
3. State Grid Jiangsu Economic Research Institute, Nanjing 210008, China
4. Key Laboratory of Power System Intelligent Dispatch and Control, Ministry of Education, Shandong University, Jinan 250061, China
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Abstract  

A variety of high voltage direct current (HVDC) control methods were synthesized, in order to further improve the voltage support strength evaluation method of hybrid multi-infeed HVDC system based on network modal decoupling. The purpose is to make it suitable for the voltage stability analysis of hybrid multi-infeed HVDC systems with heterogeneous line commutated converter based HVDC (LCC-HVDC) and voltage source converter based HVDC (VSC-HVDC). The Jacobian matrix of the DC side for the LCC-HVDC system was derived, taking into account various control methods. The impact of LCC-HVDC control method on voltage stability margin was qualitatively analyzed, and based on this, an assessment method for the grid strength of a heterogeneous LCC-HVDC multi-input system was proposed. The main contradictions in voltage stability issues in mixed DC input systems were accurately grasped. The secondary influencing factors were approximated in the form of modal perturbations to maintain the practicality and convenience of the grid strength assessment method. The effectiveness of the proposed method was demonstrated through numerical calculations and time-domain simulations. Analysis results show that the constant extinction angle control mode of LCC-HVDC is the dominant control mode that deteriorates power system voltage stability. The voltage stability of the hybrid multi-infeed high voltage direct current (HVDC) system is stronger as the HVDC capacity decreases or the contact admittance increases.

Key words： network modal decouple      hybrid multi-infeed high voltage direct current (HVDC) system      voltage stability      control mode      grid strength     
Received: 24 October 2022      Published: 11 December 2023
CLC:  TU 111  
Fund:  国家电网有限公司科技资助项目 (5100-202156020A-0-0-00)
Corresponding Authors: Guan-zhong WANG     E-mail: jx.jiang@zju.edu.cn;eewgz@sdu.edu.cn
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Jun-xian JIANG
Qi-chao CHEN
Fei WANG
Yi-xin WANG
Chen LI
Guan-zhong WANG
Cite this article:

Jun-xian JIANG,Qi-chao CHEN,Fei WANG,Yi-xin WANG,Chen LI,Guan-zhong WANG. Grid strength analysis of hybrid multi-infeed HVDC system considering different control modes. Journal of ZheJiang University (Engineering Science), 2023, 57(11): 2305-2313.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.11.018     OR     https://www.zjujournals.com/eng/Y2023/V57/I11/2305


计及不同控制方式的混合直流多馈入系统电网强度评估

综合多种高压直流(HVDC)控制方式，进一步完善基于交流网络模态解耦的混合直流多馈入系统电网强度评估方法，使之适用于异构的基于电网换相换流器的高压直流输电(LCC-HVDC)和基于电压源型换流器的高压直流输电(VSC-HVDC)的混合直流多馈入系统的电压稳定分析. 推导计及多种控制方式的LCC-HVDC直流侧雅克比矩阵，定性分析LCC-HVDC控制方式对电压稳定裕度的影响规律，在此基础上提出异构LCC-HVDC多馈入系统的电网强度评估方法. 把握混合直流馈入系统电压稳定问题中的主要矛盾，将次要影响因素以模态摄动的形式进行近似计算，以保持电网强度评估方法的实用性和便捷性. 通过数值计算和时域仿真说明所提方法的有效性. 分析结果表明，LCC-HVDC的受端定熄弧角控制方式是恶化系统电压稳定性的主导控制模式，混合直流多馈入系统的电压稳定性随着直流容量减小或联络导纳增大而增强.


关键词： 网络模态解耦,  混合高压直流(HVDC)多馈入系统,  电压稳定,  控制方式,  电网强度 
Fig.1 Equivalent circuit of LCC-HVDC infeed system
Fig.2 Analysis flow of system Jacobian matrix considering VSC-HVDC
Fig.3 Static voltage stability evaluation process of HMIDC
馈入控制方式 ${C_{\rm{c}}}$ $X$ $\gamma $ ${P_i}$
LCC-HVDC 1（CP-CEA） 0.536 0.536 18 1
LCC-HVDC 2（CP-CEA） 0.536 1.000 15 1
LCC-HVDC 3（CP-CEA） 0.536 0.180 25 1
Tab.1 DC side parameters of LCC-HVDC triple-infeed system
节点i 节点j 导纳标幺值 节点i 节点j 导纳标幺值
1 0 ?4.5 2 3 1.5
1 2 1.3 3 0 ?5.6
1 3 1.6 3 1 1.6
2 0 ?5.8 3 2 1.5
2 1 1.3 — — —
Tab.2 AC equivalent parameters of LCC-HVDC triple-infeed system
Fig.4 Variation curve of grid strength with DC power
馈入控制方式 Cc τ X γ PN QN
LCC-HVDC 1
（CP-CEA） 		0.536 1 0.15 18 1.00 —
LCC-HVDC 2
（CP-CEA） 		0.536 1 0.18 21 1.00 —
VSC-HVDC 3
（Pv/Qv） 		— — — — 0.76 0.62
Tab.3 DC side parameters of hybrid triple-infeed system
节点i 节点j 导纳标幺值 节点i 节点j 导纳标幺值
1 0 ?4.2 2 3 1.4
1 2 1.2 3 0 ?6.2
1 3 1.8 3 1 1.8
2 0 ?6 3 2 1.4
2 1 1.2 — — —
Tab.4 AC equivalent parameters of hybrid triple-infeed system
Fig.5 Power curves in MIDC system
Fig.6 Voltage curves in MIDC system
Fig.7 Time domain simulation of HMIDC system
Fig.8 IEEE-39 system model
Fig.9 Time domain simulation of IEEE-39 system
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