Novel Transient Power Control Schemes for BTB VSCs to Improve Angle Stability

Abstract

This paper proposes two novel power control strategies to improve the angle stability of generators using a Back-to-Back (BTB) system-based voltage source converter (VSC). The proposed power control strategies have two communication systems: a bus angle monitoring system and a special protection system (SPS), respectively. The first power control strategy can emulate the behaviour of the ac transmission to improve the angle stability while supporting the ac voltage at the primary level of the control structure. The second power control scheme uses an SPS signal to contribute stability to the power system under severe contingencies involving the other generators. The results for the proposed control scheme were validated using the PSS/E software package with a sub-module written in the Python language, and the simple assistant power control with two communication systems is shown to improve the angle stability. In conclusion, BTB VSCs can contribute their power control strategies to ac grid in addition to offering several existing advantages, which makes them applicable for use in the commensurate protection of large ac grid.

Analysis of Six Active Power Control Strategies of Interconnected Grids with VSC-HVDC

“…As mentioned previously, if the converter receives a high P re f vsc order by the TSO, the active power sharply increases with a ramp rate of RRS max , and a large active power is transferred from area 1 to area 2. Based on References [16,17], it was confirmed that converter power control is helpful when the power system has a contingency event; therefore, this control strategy largely contributes to the frequency stability of area 2. However, we can also expect that the angle stability of area 1 could be further worsened.…”

“…However, the transferred power is not exactly estimated since the output power is varied depending upon contingency event types; thus, it is not suitable for interconnected grids since there is a clear exchange clause in their agreement. In Reference [17], the flexible operation of the generator tripping scheme was achieved without a large decelerating energy as the generators trip, and it was confirmed that a simple converter control strategy that transfers the maximum power reserve instantly to the fault area surely contributes to the stability of the AC network. However, this paper only addressed one kind of step control.…”

“…Basically, the nine cycles as time delay should be taken with the generator tripping scheme, since a mechanical switch is included. As the electronic power equipment only requires communication delay, the activating time is naturally fast [17]. In this paper, three cycles of communication delay are adopted for t 1 time, and the minimum frequency occurred at t 2 time, as shown in Figures 6 and 7.…”

A Novel Control Strategy to Active Power Filter with Load Voltage Support Considering Current Harmonic Compensation

“…In the general classification, the converters used include voltage source inverters (VSIs) and current source inverters (CSIs). VSIs have been introduced in multi-level and multi-phase types, while in recent years, multi-level CSIs have been designed and implemented for harmonic compensation [7]. Likewise, CSIs have undergone their laboratory and industrial evolution and performance reporting and are presented in valid different structures [8].…”

PV Tracking Design Methodology Based on an Orientation Efficiency Chart

“…Different variants of photovoltaic (PV) systems, such as PV concentration [1], maximum power point tracking (MPPT) [2], and/or solar tracking systems, are frequently studied to increase the collection efficiency of PV systems. These systems are divided into two types-passive and active tracking systems.…”