Abstract
This paper focuses on analyzing the dynamic performance of various reactive power compensators at weak LCC-HVDC terminals. Four scenarios based on combination of active and passive reactive power compensation schemes are presented. The comparative performance analysis of various compensators in different types of AC and DC system faults are evaluated using electromagnetic transient simulation program PSCAD/EMTDC. The analysis shows that fixed capacitor has poor performance and results in reducing effective short circuit ratio of system, while STATCOM on the other hand, increases AC system strength and has significant performance in areas like immunity to commutation failure, suppression of temporary overvoltage, AC bus voltage regulation and fault recovery time.
Highlights
Line Commutated Converter (LCC) based High Voltage Direct Current Transmission (HVDC) is widely implied throughout world for transmission of power from distant parts to local AC grid stations [1, 2]
LCC –HVDC station absorbs reactive power in range of 0.5 to 0.6 p.u. of rated DC power, which is usually supplied by filters and fixed capacitors connected to AC busbar [7, 8]
Scenario 1 and 2 have lower Commutation Failure Immunity Index (CFII) values, as in both cases fixed capacitor is connected to inverter bus which results in decreasing ability of LCC-HVDC link against commutation failures
Summary
Line Commutated Converter (LCC) based High Voltage Direct Current Transmission (HVDC) is widely implied throughout world for transmission of power from distant parts to local AC grid stations [1, 2]. Weak AC system having high impedances and low inertia, results in various operating issues like voltage instability, limitations on power transfer, temporary overvoltages, fault recovery problems, commutation failures, harmonic resonances and frequency deviations [3]. To overcome these operating issues, various compensating equipment like Fixed Capacitor (FC), Synchronous Compensator (SC), Static Var. Compensator (SVC) and Static Synchronous Compensator (STATCOM) are utilized [4,5,6]. This paper investigates in detail the dynamic performances analysis of different reactive power compensators at weak LCC- HVDC system without connecting RL load to AC bus.
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