Synchronverter-based emulation and control of HVDC transmission

Abstract

This paper presents a new control strategy for High Voltage Direct Current (HVDC) transmission based on the synchronverter concept: the sending-end rectifier controls emulate a synchronous motor (SM), and the receiving end inverter emulates a synchronous generator (SG). The two converters connected with a DC line provide what is called a Synchronverter HVDC (SHVDC). The structure of the SHVDC is firstly analyzed. It is shown that the droop and voltage regulations included in the SHVDC structure are necessary and sufficient to well define the behavior of SHVDC. The standard parameters of the SG cannot be directly used for this structure. A specific tuning method of these parameters is proposed in order to satisfy the usual HVDC control requirements. The new tuning method is compared with the standard vector control in terms of local performances and fault critical clearing time (CCT) in the neighboring zone of the link. The test network is a 4 machine power system with parallel HVDC/AC transmission. The results indicate the contribution of the proposed controller to enhance the stability margin of the neighbour AC zone of the link.

Transient stability of power systems with embedded VSC‐HVDC links: stability margins analysis and control

“…Recently, promising tracks using the inner loops of the converter for improving transient stability have been proposed. In [24], the authors show that controlling the inverter (rectifier) station to emulate the behaviour of a synchronous motor (generator) has a favourable impact on transient stability. Furthermore, in [25,26] the authors' design robust inner controllers of the converters taking into account the dynamics of the surrounding AC grid.…”

SSR Analysis of DFIG-Based Wind Farm With VSM Control Strategy

“…VSM is mainly applied in systems with grid-connected voltage source converters (VSC), e.g. full-capacity wind power plants [5], [6], doubly-fed induction generator (DFIG)-based wind farms [7], [8], high voltage DC (HVDC) transmission systems [9], photovoltaic (PV) plants [10] and compensation devices [11], etc. In [5], a synchronverter-based control strategy was proposed for the converters in a PMSG-based system, which has greatly improved the performance of the wind turbine under different system conditions.…”

“…In [6], a virtual generator control method in combination with a minute-level energy storage was proposed for full capacity converter wind turbines, which has improved the system dynamic response. In [9], based on the synchronverter technique, a parameter tuning method was proposed to emulate SGs by using rectifiers and inverters in a HVDC transmission system. A control strategy was proposed in [10] to make PV plants work like a SG through energy storage systems, and the transient stability of power systems was successfully enhanced.…”

Operation paradigm of an all converter interfaced generation bulk power system

“…As a converter can be controlled to mimic the dynamics of a synchronous machine [9][10][11][12][13][14][15], the necessity of a constant frequency grid forming converter in a BPS can be questioned. However, while this mimicry can help ensure that the system performance with large penetration of converters conforms to the existing standards and criteria, it could possibly be restrictive on the use of potential fast control capabilities that can be offered by a converter interfaced source.…”