Short-circuit Ratio Indicator for Grid-forming DC-supported Renewable Energy Radiative Integration System

LIU Chaonan; ZHAO Chengyong

doi:10.13334/j.0258-8013.pcsee.250168

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Short-circuit Ratio Indicator for Grid-forming DC-supported Renewable Energy Radiative Integration System

更新时间：2026-10-12

- Short-circuit Ratio Indicator for Grid-forming DC-supported Renewable Energy Radiative Integration System
- Vol. 46, Issue 9, Pages: 3578-3592(2026)
- 作者机构：
  
  新能源电力系统国家重点实验室(华北电力大学)，北京市昌平区,102206
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.250168
  CLC：
- Received：05 May 2026，
  
  Published：2026
- 稿件说明：
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LIU Chaonan, ZHAO Chengyong. Short-circuit Ratio Indicator for Grid-forming DC-supported Renewable Energy Radiative Integration System[J]. 2026, 46(9): 3578-3592.
DOI：

LIU Chaonan, ZHAO Chengyong. Short-circuit Ratio Indicator for Grid-forming DC-supported Renewable Energy Radiative Integration System[J]. 2026, 46(9): 3578-3592. DOI： 10.13334/j.0258-8013.pcsee.250168.

摘要

我国沙戈荒地区新能源交流汇集网架面临无常规电源支撑、无交流主网联络的问题，基于构网控制的直流换流站可为网架提供电压支撑，但受电流限幅环节的影响，其本身提供电压支撑能力有限，因此亟需提出一种评估此类新能源多点汇集网架的电压强度指标。该文基于短路比的物理本质，提出一种适用于由构网换流站提供电压支撑的新能源辐射型交流汇集网架电压强度评估方法，并提出临界短路比计算方法，实现对上述系统电网强度评估。首先，建立新能源多点汇集系统等效模型，采用支路追加法分析新能源并网对节点电压的影响，推导出考虑其余节点注入电流影响的新能源等效并网电流计算方法；然后，分析新能源场站以及考虑电流限幅的构网型换流器的支撑电流提供能力，结合并网支路P-V关系，提出系统为并网支路提供支撑电流的计算方法；接着，提出基于电流计算的短路比指标SCR-I，并基于支路最大传输功率提出临界短路比CSCRI的计算方法，结合两者提出上述系统电压强度评估方法；最后，通过算例验证采用SCR-I和CSCRI评估交流网架电压强度方法的准确性与合理性。

Abstract

The converter station based on grid-forming control can provide voltage support for the renewable energy AC grid without conventional power supply support and AC main network connection in deserts

gobi

and barren lands of China

but its voltage support capability is constrained by current limiting. In this paper

a calculation method of short circuit ratio and critical short circuit ratio of renewable energy radial AC grid with grid converter providing voltage support is proposed. Firstly

the equivalent grid-connected current of the grid-connected point considering the influence of the injection current of the remaining nodes is derived. Secondly

the calculation of the supporting current of the system with current limiting link for renewable energy is obtained. Then

the calculation method of short-circuit ratio (SCR-I) and critical short circuit ratio (CSCRI) based on current calculation is proposed. By integrating the aforementioned elements

the grid voltage strength evaluation method is developed. Finally

the accuracy and rationality of using SCR-I and CSCRI to evaluate the voltage intensity of AC grid are verified by some examples.

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