Equivalent Impedance Study of Harmonics for the ±800kV Xiangjiaba–Shanghai Ultra-High-Voltage Direct-Current Transmission Project-Taizhou Haoxin Electric Power Machinery Co., Ltd.

Equivalent Impedance Study of Harmonics for the ±800kV Xiangjiaba–Shanghai Ultra-High-Voltage Direct-Current Transmission Project

Release time:

2025-07-23

Based on the research findings from the planning of power transmission schemes for hydropower from southwestern China and in combination with relevant foreign studies, ±800 kV DC transmission is technically feasible and well-suited to China’s actual conditions. The boundary conditions for connecting the converter station of the Xiangjiaba–Shanghai ±800 kV ultra-high-voltage DC demonstration project are complex, and the power grid operation modes in the Jinsha River region are diverse. Therefore, it is crucial to reasonably determine equivalent harmonic impedance parameters used in the design of AC filters, which will enable a rational configuration of the AC filter scheme and ensure the optimized design of reactive power compensation and control strategies. Consequently, it is necessary to understand the frequency characteristics of the system impedance as seen from the AC busbars of the converter station into the power system.

Based on the research findings from the planning of power transmission schemes for hydropower export in Southwest China, combined with relevant foreign studies, ±800 kV DC transmission is technically feasible and well-suited to China’s actual conditions. The boundary conditions for connecting the converter station of the Xiangjiaba–Shanghai ±800 kV ultra-high-voltage DC demonstration project are complex, and the power grid operation modes in the Jinsha River region are diverse. Therefore, it is crucial to reasonably determine equivalent harmonic impedance parameters used in the design of AC filters, so as to achieve a rational configuration of AC filter schemes and ensure the optimized design of reactive power compensation and control strategies. To this end, it is necessary to understand the frequency characteristics of system impedance as seen from the AC busbars of the converter station—that is, the equivalent harmonic impedance of the converter busbars. Commonly used tools for equivalent harmonic impedance calculation include ABB’s SIMPOW software and Canada’s Teshmont’s NIMSCAN software. Since the NIMSCAN software shares similar data input formats with BPA software, which is widely used domestically, a data conversion and processing interface program has been developed. This interface has been successfully applied in harmonic impedance equivalence calculations at DC converter stations in multiple countries. Consequently, for the ±800 kV Xiangjiaba–Shanghai UHV DC transmission project, all component parameters of the harmonic filters must be modeled using the NIMSCAN software to establish frequency-dependent impedance models; these parameters, however, are typically simplified in conventional power system calculations.

This paper establishes impedance-frequency models for individual electrical components—including nodes, generators, transformers, and transmission lines—based on their distinct characteristics. It identifies the AC/DC system operating mode suitable for harmonic impedance equivalent calculation in the Xiangjiaba–Shanghai ultra-high-voltage direct-current project. The NIMSCAN program is used to perform harmonic impedance equivalence, and the resulting equivalence results are statistically partitioned.

Tags:

Railway capacity will continue to favor coal transportation this year.

Return to list

The “big cake” of nuclear power is attracting numerous companies to compete for a share.

Relevant information

Local power companies leverage the 920 Project to expand into other regions.

Railway capacity will continue to favor coal transportation this year.

Taizhou Haoxin Electric Power Machinery Co., Ltd.

Phone:

+86-523-86934699

Email:

haoxin265@163.com

Phone: +86-523-86934699 +86-523-86116986
Fax: +86-523-86116986 +86-523-86934868
Mobile phone:+86-15312798616
Email: haoxin265@163.com

Email: sales@haoxinpower.com
Address: Xingyuan Road, Xuzhuang Science and Technology Entrepreneurship Park, Gaogang District, Taizhou City, Jiangsu Province

COOKIES

Our website uses cookies and similar technologies to personalize the advertising shown to you and to help you get the best experience on our website. For more information, see our Privacy & Cookie Policy

COOKIES

required

These cookies are necessary for basic functions such as payment. Standard cookies cannot be turned off and do not store any of your information.

analyze

These cookies collect information, such as how many people are using our site or which pages are popular, to help us improve the customer experience. Turning these cookies off will mean we can't collect information to improve your experience.

Feature

These cookies enable the website to provide enhanced functionality and personalization. They may be set by us or by third-party providers whose services we have added to our pages. If you do not allow these cookies, some or all of these services may not function properly.

advertise

These cookies help us understand what you are interested in so that we can show you relevant advertising on other websites. Turning these cookies off will mean we are unable to show you any personalized advertising.

Message Consultation

We will contact you within one working day. Please pay attention to your email.

Business license

AI search

HUATAO GROUP

COOKIES

COOKIES