Abstract
This paper presents an application of an asynchronous back to back VSC-HVDC system, which uses multilevel converter, which uses two-level series voltage connection SPWM converter topology technique. The control strategy is design and implementation of Multi-Terminal on a VSC-HVDC network, representing the future transnational network in Thailand with rated 300MVA (±300kV). The capability to dispatch the offshore wind power as well as the traded power among the onshore grids is explored under wind speed changes. The controller of an asynchronous back to back VSC-HVDC system, the process PQ controller can realize the designated control of active power (P) and reactive power (Q) strategy. The PQ power can exchange controlled independently, the experimental in laboratory tests, and simulation results got from MATLAB/Simulink program software, The Simulation results, the PQ-controller results consist of PMSG rotational speed, voltages and currents, the active and reactive power, DC-bus (kVDC), DC-power (Pdc) and step response command active power, the control of DC-bus voltage is assured by regulation of the active and reactive power. The control strategy of PQ-control to the two-level SPWM converters topology technique for the realization of HVDC system, and to confirm the control strategy provides satisfactory response and strong stability. The system of wind power application is used as a guideline for analyzing and design of the data process control with the PQ-control HVDC system.
Highlights
Wind power generation has been in rapid growth, but they have characteristics of randomness, intermittent, uncontrollable
This paper describes the operation and control of the Voltage Source Converter (VSC) based high-voltage direct-current transmission (HVDC) transmission system has been proposed using by equation (Eq.6 to Eq.9.) gives that reactive power (Q) and active power (P) is proportional to the DC current and DC voltage command power transported such as (Vdc, Idc), is the power delivered to the DC bus
An asynchronous back-to-back HVDC link based on VSC converter rated at 348kVA (±300kVDC) employing two-level SPWM converter hardware prototype as shown in figure the PWM has been tested for amplitude with modulation index with sine wave with multicarrier waves for three phase two level SPWM system
Summary
Wind power generation has been in rapid growth, but they have characteristics of randomness, intermittent, uncontrollable. For such a Multi-Terminal offshore network, where large power would be transmitted over long distance, application of high-voltage alternating-current transmission (HVAC) technology may be difficult to implement due to large amount of reactive power compensation required. Since the offshore network may act as a power pool where power may be injected to and extracted from the network at different nodes, flexibility to control direction of power whilst maintaining voltage in the network is required For such a situation, implementation of voltage sourced converter HVDC (VSC-HVDC) technology is favorable, in the study, Z. The cut-out wind speed value (here considered 25 m/s)
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