Abstract
To control multiple series units of distributed power flow controller (DPFC), a hierarchical control method is proposed. This coordination control system consists of a coordination controller and multiple series unit controllers. According to the demand of power flow ordered by a dispatch center, the corresponding series-compensated voltage is calculated by a high-level controller and transferred to each series unit controller. Comparing the targeted compensated voltage with actual injected voltage, the modulation signal of the converter will be modified to change the power flow accurately. The DPFC system model is built in Power Systems Computer Aided Design/ Electromagnetic Transients including DC (PSCAD/EMTDC). The simulation result indicates that the proposed hierarchical control method is effective and can be considered as an option for practical engineering applications in the future.
Highlights
The mechanically controlled AC power transmission systems, including the use of high-power electronics, advanced control centers, and communication links, were proposed in 1986 by N.G.Hingorani from American Electric Power Research Institute (EPRI) [1,2,3]
To address the above issue, this paper proposes a hierarchical coordination control method for distributed power flow controller (DPFC) series units
At time t = 3.5 s, SOAPr and SOAQr are stable at 800.14 W and −98.11 Var, respectively
Summary
The mechanically controlled AC power transmission systems, including the use of high-power electronics, advanced control centers, and communication links, were proposed in 1986 by N.G. The distributed series units control the exchange between the 3rd harmonic active power and base-frequency active power. References [28,29] proposed a specific power flow control method: taking the terminal voltage of the transmission line as a reference, this technique requires high-speed communication links to transfer the real-time waveform of the terminal voltage to multiple series unit controllers. The waveform of the real-time phase of the terminal voltage can be reproduced correctly during a control period In this way, a high-speed communication link is not required.
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