Coordinated control scheme for ancillary services from offshore wind power plants to AC and DC grids

Sakamuri, Jayachandra N.; Altin, Müfıt; Hansen, Alexander; Cutululis, Nicolaos Antonio; Rather, Zakir Hussain

doi:10.1109/pesgm.2016.7741636

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…The deloading technique for DFIG in a fault condition was introduced in papers like [28][29][30][31]. Deloading by rising frequency is proposed in this paper.…”

Section: Deloading By Rotor Current Droopmentioning

confidence: 99%

Advanced Fault Ride-Through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection

et al. 2019

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In order to solve the problems brought upon by off-shore wind-power plants, it is important to improve fault ride-through capability when an on-shore fault occurs in order to prevent DC overvoltage. In this paper, a coordinated control strategy is implemented for a doubly-fed induction generator (DFIG)-based off-shore wind farm, which connects to on-shore land by a modular multilevel converter (MMC)-based high voltage direct current (HVDC) transmission system during an on-shore fault. The proposed control strategy adjusts the DC voltage of the off-shore converter to ride through fault condition, simultaneously varying off-shore AC frequency. The grid-side converter detects the frequency difference, and the rotor-side converter curtails the output power of the DFIG. The surplus energy will be accumulated at the rotor by accelerating the rotor speed and DC link by rising DC voltage. By the time the fault ends, energy stored in the rotor and energy stored in the DC capacitor will be released to the on-shore side to restore the normal transmission state. Based on the control strategy, the off-shore wind farm will ride through an on-shore fault with minimum rotor stress. To verify the validity of the proposed control strategy, a DFIG-based wind farm connecting to the on-shore side by an MMC HVDC system is simulated by PSCAD with an on-shore Point of Common Coupling side fault scenario.

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“…The deloading technique for DFIG in a fault condition was introduced in papers like [28][29][30][31]. Deloading by rising frequency is proposed in this paper.…”

Section: Deloading By Rotor Current Droopmentioning

confidence: 99%

Advanced Fault Ride-Through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection

et al. 2019

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“…It is based on symmetrical monopole configuration having same voltage with opposite polarity at the converter terminals. PowerFactory's built‐in converter, π ‐model of the cable, and standard transformer models [15] have been used in this study. A brief description of the grid layout is summarised in Table 1.…”

Section: Power System Modelmentioning

confidence: 99%

Coordinated frequency control from offshore wind power plants connected to multi terminal DC system considering wind speed variation

Sakamuri

Altin

Hansen

et al. 2016

IET Renewable Power Generation

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A coordinated fast primary frequency control scheme from offshore wind power plants (OWPPs) integrated to a three terminal high voltage DC (HVDC) system is proposed in this study. The impact of wind speed variation on the OWPP active power output and thus on the AC grid frequency and DC grid voltage is analysed. The removal of active power support from OWPP after the frequency control action may result in second frequency (and DC voltage) dips. Three different methods to mitigate these secondary effects are proposed, such as, (i) Varying the droop gains of the HVDC converter (ii) Releasing the active power support from OWPP with a ramp rate limiter and (iii) An alternative method for the wind turbine overloading considering rotor speed. The effectiveness of the proposed control scheme is demonstrated on a wind power plant integrated into a three terminal HVDC system developed in DIgSILIENT PowerFactory. The results show that the proposed coordinated frequency control method performs effectively at different wind speeds and minimises the secondary effects on frequency and DC voltage. 2 Power system model The grid layout considered in this paper consists of two onshore AC grids (AC grid-2 and AC grid-3) and one offshore grid (AC grid-1) with OWPPs connected all together through a three

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Section: Introductionmentioning

confidence: 99%

“…An intermediate solution can be found by using complementary P-V DC droop functions in the slave terminal of a centralised control structure [7][8][9][10][11]. In [7], a hybrid centralised DC voltage control based on a master-slave architecture and complemented with P-V DC droop functions in the slave terminal is proposed, in contrast to [8][9][10][11], for a multi-terminal HVDC. The present paper is a continuation of the work presented in [7] by investigating the effects of including grid code compliance frequency requirements in the control scheme, in contrast to [8][9][10][11][12][13] where no grid code is considered.…”

Section: Introductionmentioning

confidence: 99%

Methodology for Tuning MTDC Supervisory and Frequency-Response Control Systems at Terminal Level under Over-Frequency Events

et al. 2020

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This paper proposes a methodology for tuning a supervisory and frequency-response outer loop control system of a multi-terminal direct current (MTDC) grid designed to transmit offshore wind energy to an onshore AC grid, and to provide frequency support during over-frequency events. The control structure is based on a master–slave scheme and ensures the achievement of frequency response, with specific implementation of the UK national grid code limited-frequency sensitive (LFSM) and frequency-sensitive (FSM) modes. The onshore AC grid is modelled with an equivalent frequency-response model to simulate the onshore AC grid dynamics under frequency deviations. The main innovation of this paper is the development of a methodology for tuning simultaneously two hierarchical levels of a MTDC coordinated control structure, i.e., the MTDC supervisor, given by the active power set point for slave terminal, and the slope of frequency-response functions at onshore terminals. Based on these two hierarchical levels, different strategies are evaluated in terms of frequency peak reductions and change of the frequency order type. Moreover, tuning guidance is given when a different MTDC control structure or different synchronous generator characteristics of the onshore AC grid are considered.

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Coordinated control scheme for ancillary services from offshore wind power plants to AC and DC grids

Cited by 8 publications

References 11 publications

Advanced Fault Ride-Through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection

Advanced Fault Ride-Through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection

Coordinated frequency control from offshore wind power plants connected to multi terminal DC system considering wind speed variation

Methodology for Tuning MTDC Supervisory and Frequency-Response Control Systems at Terminal Level under Over-Frequency Events

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