Frequency Regulation Challenge of Power Electronics Dominated Power Systems and Its New Multi-level Coordinated Control Framework

doi:10.11930/j.issn.1004-9649.201903121

Abstract

Abstract: The widely-used converters in the source, grid, and demand sides have advanced the electronics domination process of power systems. With the increasing of net load, and the decreasing of synchronous inertia and power balance capability, the risk of frequency stability has emerged. One the one hand, future power system must keep power balance with less synchronous generation capacity; on the other hand, due to absence of output responding to system frequency, and input uncontrollability, and also due to the heterogeneous controllers, converters could hardly be adapted for frequency regulation framework of the traditional synchronous system. Based on designing the voltage resource converter (VSG), the paper proposes a novel multi-level coordinated control framework of power electronics dominated power systems. In the converter level, the coupling relationship of output power and system frequency is rebuilt by simulating the inertial response and primary frequency control. In the equipment level, virtual parameters are grid-friendly optimized to coordinate the energy from internal storage and from input in order to reduce the risk of secondary frequency drip. In the multiple-converters level, devices are cooperated that improves the frequency dynamics and that provide frequency restoration. In the system level, the inter-area frequency regulation is supported again across DC-line-isolated synchronous systems on the basis of droop control of VSC-HVDC stations.

Key words: power electronics domination, designability, frequency regulation, virtual synchronous, power balance

CLC Number:

TM761

LU Zongxiang, YE Yida, GUO Li, XIE Zhenjian, LIU Guojing, QIAO Ying. Frequency Regulation Challenge of Power Electronics Dominated Power Systems and Its New Multi-level Coordinated Control Framework[J]. Electric Power, 2019, 52(4): 8-17,110.

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https://www.electricpower.com.cn/EN/Y2019/V52/I4/8

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