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Frequency control of voltage sourced converter-based multi-terminal direct current interconnected system based on virtual synchronous generator

Li Congshan, Zhang Xiaowei, He Ping, Zhen Zikai, Zhao Kefeng

Archives of Electrical Engineering

2023

Vol. 72, nr 4

971--986

In response to the inability of the flexible DC transmission system connected to the AC grid under conventional control strategies to provide inertia to the system as well as to participate in frequency regulation, a virtual synchronous generator (VSG) control strategy is proposed for a voltage source converter (VSC)-based multi-terminal high-voltage direct current (VSC-MTDC) interconnection system. First, the virtual controller module is designed by coupling AC frequency and active power through virtual inertia control, so that the VSC-MTDC system can provide inertia response for AC grid frequency. Second, by introducing the power margin of the converter station into the droop coefficient, the unbalanced power on the DC side is reasonably allocated to reduce the overshoot of the DC voltage in the regulation process. Finally, the power regulation capability of the normal AC system is used to provide power support to the fault end system, reducing frequency deviations and enabling inter-regional resource complementation. The simulation model of the three-terminal flexible DC grid is built in PSCAD/EMTDC, and the effectiveness of the proposed control strategy is verified by comparing the conventional control strategy and the additional frequency control strategy.

Reliability and performance indexes in polish power units

Kaproń H., Kowal I., Parciński G.

Rynek Energii

2016

Nr 2

96--102

This article presents the history of collecting and processing of reliability data of power units with 120-500 MW capacity. The system includes 108 Polish power units with a summary capacity equal to about 2/3 of generating capacity of the national power system. In addition, this article presents definitions and calculated values of indicators which characterize the availability of domestic power units.

W artykule przedstawiono historię systemu gromadzenia i przetwarzania danych o awaryjności bloków energetycznych 120-500 MW. System ten obejmuje 108 bloków energetycznych stanowiących ok 2/3 zdolności wytwórczych krajowego systemu elektroenergetycznego. Ponadto podano definicje obliczanych wskaźników charakteryzujących dyspozycyjność jednostek wytwórczych oraz wartości wskaźników niezawodnościowych i eksploatacyjnych krajowych bloków energetycznych w ostatnich latach.