Dynamic Stability Improvement of Decentralized Wind Farms by Effective Distribution Static Compensator

Abstract

Dynamic instability of decentralized wind energy farms is a major issue to deliver continuous green energy to electricity consumers. This instability is caused by variations of voltage and frequency parameters due to intermittencies in wind power. Previously, droop control and inverter-based schemes have been proposed to regulate the voltage by balancing reactive power, while inertial control, digital mapping technique of proportional-integral-differential (PID) controller and efficiency control strategy have been developed to regulate the frequency. In this paper, voltage stability is improved by a new joint strategy of distribution static compensator (DSTATCOM) six-pulse controller based reactive power management among decentralized wind turbines and controlled charging of capacitor bank. The frequency stability is ensured by a joint coordinated utilization of capacitor bank and distributed wind power turbines dispatching through a new DSTATCOM six-pulse controller scheme. In both strategies, power grid is contributed as a backup source with less priority. These new joint strategies for voltage and frequency stabilities will enhance the stable active power delivery to end users. A system test case is developed to verify the proposed joint strategies. The test results of the proposed new schemes are proved to be effective in terms of stability improvement of voltage, frequency and active power generation.

Flexible Power Supply System of AC Electric Arc Furnace

“…Based on the fast Fourier transform (FFT) results, the maximum individual interharmonics voltage (denoted as percentage of nominal with the resolution of 1 Hz [26]) in case 1-1 and case 2-2 are 2.32% at 72 Hz and 0.56% at 36 Hz, respectively. Even though the values of both two cases are less than 3% and meet the standard for the investigated 35 kV system [27], the FPS system owns obvious advantages, which is also embodied in the flicker assessment shown in Fig. 14(a).…”

“…As the EAF consumes active power for steelmaking, a practical method for calculating the total power loss σ is expressed as: Note: only typical (the 2 nd to 7 th ) harmonics of AC EAF are listed; and THD refers to the total harmonic distortion [27].…”

Coordinated reactive power planning in an industrial park integrated energy system using support vector regression

“…Further investigation in [7] examined how variations in wind energy and the power demand of loads affect the voltage levels in wind power systems, both with and without the integration of DSTATCOM. A unique strategy described in [8] employs a six-pulse controller in DSTATCOM for managing reactive power in wind farms, alongside strategic capacitor bank charging, to enhance voltage stability. The research methodology applied in [6][7] [8] involves time-domain simulations, which, while providing an accurate portrayal of voltage recovery ability.…”

“…A unique strategy described in [8] employs a six-pulse controller in DSTATCOM for managing reactive power in wind farms, alongside strategic capacitor bank charging, to enhance voltage stability. The research methodology applied in [6][7] [8] involves time-domain simulations, which, while providing an accurate portrayal of voltage recovery ability. However, these methods are limited by their time-costed nature in a large system.…”

Autonomous-synergic Voltage Security Regions in Bulk Power Systems

“…An effective means of voltage control to prevent largescale cascading failures using a stepwise search method is to determine certain security voltage control ranges for all stations [1], [3]. This primarily deals with large-scale issues in wind power integration areas [4]. Voltage security regions in power injection spaces for distribution power systems, which can significantly simplify the solution to the optimization problem, were introduced in [5].…”