Frequency Stability of Power System with Large Share of Wind Power Under Storm Conditions

Kaushik Das,Feng Guo,Nicolaos A Cutululis,Edgar Nu駉

doi:10.35833/mpce.2018.000433

Abstract

The operation of transmission systems with large share of wind power is specially challenging under storm conditions. Under the stormy wind speed conditions, wind turbine protection system is designed to shut down the turbine to avoid excessive mechanical load. The sudden loss of wind power from large offshore plants is difficult to forecast accurately, which results in a large amount of power imbalance. The severity of such a wind power imbalance towards frequency stability needs to be studied for the future power systems. In addition, the overhead transmission lines can also be affected during storms, thereby increasing their probability of failure in the operation of power system under the islanded conditions. This paper investigates how the stormy weather can threaten the frequency stability of future Danish power system with large share of wind power and how to avoid the frequency instability through proper control and defence strategies such as high-voltage direct current (HVDC) control and load shedding. Sensitivity studies are performed for ramp rates of HVDC control, load shedding strategies, inertia of the system with different volumes of disturbances to understand their impact on frequency stability.

Highlights

CONCERNS for environment, security of supply, sustain‐ able development are driving the traditional power sys‐ tems all over the world towards the future power systems with large share of renewable energy sources (RESs)
The number of realizations n depends on the degree of confidence of the forecasts available for the storm. For each of these realizations, balance and reserve requirements for handling the storm should be assessed in the intercon‐ nected operation mode since certain volume of balancing re‐ serves can be obtained from neighbouring regions
The studies presented in this paper aim at analyzing the frequency stability of a power system with large share of wind power under storm conditions

Summary

Introduction

CONCERNS for environment, security of supply, sustain‐ able development are driving the traditional power sys‐ tems all over the world towards the future power systems with large share of renewable energy sources (RESs). Most of the modern RESs such as wind power and solar photovol‐ taics (PV) are connected through power electronic devices. These generations do not inherently contribute to the inertia of the power system. More and more challenges regarding the security and stability of the power system emerge when conventional generations are replaced by these modern RESs. RESs such as wind and solar power are inher‐

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