Delta power control strategy for multi-string grid-connected PV inverters

Sangwongwanich, Ariya; Yang, Yongheng; Blaabjerg, Frede; Séra, Dezső

doi:10.1109/ecce.2016.7854998

Cited by 20 publications

(23 citation statements)

References 26 publications

(24 reference statements)

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“…The major challenges in the implementation of these methods include (1) power set-point tracking in fast dynamics and (2) monitoring the variable maximum power to keep track of the maintained reserves [24]. In the literature [25], MPPT-like control algorithms are proposed that involve the perturbation of the operating point in discrete voltage steps, thus exhibiting a mediocre dynamic response. A voltage PI controller is employed in the literature [26] for an enhanced dynamic response; however, the power set point tracking performance is degraded.…”

Section: Introductionmentioning

confidence: 99%

Virtual Inertia-Based Control Strategy of Two-Stage Photovoltaic Inverters for Frequency Support in Islanded Micro-Grid

Huang

Wang

et al. 2018

Electronics

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For an islanded micro-grid with a high penetration of photovoltaic (PV) power generators, the low inertia reserve and the maximum peak power tracking control may increase the difficulty of maintaining the system's supply-demand balance, and cause frequency instability, especially when the available generation is excessive. This will require changes in the way the PV inverter is controlled. In this paper, a virtual inertia frequency control (VIFC) strategy is proposed to let the two-stage PV inverters emulate inertia and support the system frequency with a timely response (e.g., inertia response), and the required power for inertia emulation is obtained from both the DC-link capacitor and the PV reserved energy. As the rate of the system frequency change can be reduced with the inertia increase, the proposed method can mitigate the frequency contingency event before the superior-level coordination control is enabled for the frequency restoration. The simulation results demonstrate the effectiveness of the proposed method.

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Section: Introductionmentioning

confidence: 99%

Virtual Inertia-Based Control Strategy of Two-Stage Photovoltaic Inverters for Frequency Support in Islanded Micro-Grid

Huang

Wang

et al. 2018

Electronics

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“…reserves and track power set-points, permitting effective up and down regulation of its output on command [10]- [12].…”

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confidence: 99%

“…In photovoltaic (PV) systems, operating reserves can be provided by either installing energy storage or curtailing generation [5], [12]- [14]. The former option employs batteries [15], ultracapacitors [16] or fuel cells [17] to reutilize the curtailed energy, albeit at an increased installation and maintenance cost.…”

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confidence: 99%

“…In order to extend the power reserves requirement to smalland medium-scale PV plants, where a two-stage string-inverter topology is most often adopted [11], [12], modification of the dc-dc converter control is required [10]. In [11], [12], [19]- [21], MPPT-like control schemes are proposed that involve perturbation of the operating point in discrete voltage steps, thus exhibiting mediocre dynamic response. For a better response, a voltage PI controller is employed in [10] and [26], which however proves ineffective in tracking power set-points.…”

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confidence: 99%

“…In [1], [6], [22], and [23], this estimation is performed by means of irradiance/temperature sensors and a mathematical model; although simple, this approach suffers in accuracy due to the inevitable deviations of the actual PV system parameters from the values of datasheet [11]- [13]. The method presented in [12] requires a part of the PV plant to operate in the MPPT mode to monitor the actual maximum power; yet, this approach is suitable only for large PV plants with identical components and conditions. An interesting alternative is proposed in [11], where the system periodically enters the MPPT mode, storing the excess energy in the dc-link, thus not This work is licensed under a Creative Commons Attribution 3.0 License.…”

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PV System Control to Provide Active Power Reserves Under Partial Shading Conditions

Batzelis

Papathanassiou

Pal

2018

IEEE Trans. Power Electron.

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The challenges of modern power systems will inevitably impose increased ancillary service requirements to photovoltaic (PV) plants in the future, including operating reserves. Recent studies have investigated methods to maintain active power reserves without energy storage in the standard case of uniform illumination. In this paper, this functionality is extended to partial shading conditions, often encountered in PV systems. A new control scheme is proposed that permits operation at a reduced power level, estimating at the same time the shading conditions and maximum available power. This is achieved by applying a least-squares curve fitting algorithm on voltage and current measurements, without relying on any irradiance or temperature sensors. To the best of our knowledge, this is the first power reserves control scheme for PV systems under partial shading presented in the literature. The robustness and effectiveness of the proposed method are validated under rapidly changing shading conditions through simulations and experimental tests on a 2-kW PV system prototype. Index Terms-Active power control, maximum power point tracking (MPPT), partial shading, power reserves, photovoltaic (PV) system. I. INTRODUCTION T HE INTERMITTENT nature of renewable energy generation imposes technical challenges to the power system operation and control [1], [2]. Network codes are constantly revised, requiring increasingly more services from these systems, including fault-ride-through, reactive power injection, frequency response, operating reserves, and output power variability (rate of change) constraints [3]-[9]. To provide some of these services, a power plant should be able to keep active power

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Virtual inertia control of PV systems for dynamic performance and damping enhancement of DC microgrids with constant power loads

Hosseinipour

Hojabri

2018

IET Renewable Power Generation

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DC bus voltage in islanded DC microgrids (MGs) is prone to power fluctuations of sources and loads. This is due to the lack of generational inertia, which is caused by high penetration of converter-based renewable energy sources (RESs). With the growing penetration of RESs, especially photovoltaic arrays (PVAs), they are required to provide grid support services such as inertial response in a similar way to conventional synchronous generators. Here, a virtual inertia control (VIC) is proposed for PVAs to enhance the inertia of a hybrid PVA-battery DC MG. The proposed VIC employs active power control of PVAs to provide virtual inertial response (VIR) without using any high-power energy storage system such as supercapacitors. An adaptive virtual inertia gain is introduced to achieve dynamic power sharing between the PVAs that provide VIR. Impedancebase stability analysis is utilised to study the impact of the virtual inertia gain on the system stability and to show the impact of the proposed VIC on improving the stability margin of the DC MG in the presence of destabilising constant power loads (CPLs). Finally, simulation results are presented to verify the effectiveness of the proposed method in dynamic performance and damping enhancement of the DC MG and reducing the high-current stress on the battery.

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Delta power control strategy for multi-string grid-connected PV inverters

Cited by 20 publications

References 26 publications

Virtual Inertia-Based Control Strategy of Two-Stage Photovoltaic Inverters for Frequency Support in Islanded Micro-Grid

Virtual Inertia-Based Control Strategy of Two-Stage Photovoltaic Inverters for Frequency Support in Islanded Micro-Grid

PV System Control to Provide Active Power Reserves Under Partial Shading Conditions

Virtual inertia control of PV systems for dynamic performance and damping enhancement of DC microgrids with constant power loads

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