This paper presents a multi-input multi-output (MIMO) control strategy based on dq model of electronically coupled distributed energy resources (DERs). The DER represents a dispatchable distributed generation (DG) whi...
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ISBN:
(纸本)9781509052288
This paper presents a multi-input multi-output (MIMO) control strategy based on dq model of electronically coupled distributed energy resources (DERs). The DER represents a dispatchable distributed generation (DG) which is connected to the main grid by means of three phase voltage source converter (VSC). The control scheme uses Phase-Locked Loop (PLL) to estimate the frequency of the grid. Therefore, the controller can be implemented in dq frame. The DER is assumed to be in a microgrid with local loads which have different topologies such as unbalanced and harmonically polluted loads. The objective is to control the real and reactive powers that DER delivers to the main grid by current-mode control of VSC in the presence of different topologies for local loads. The control strategy uses the theory of repetitive controller which guarantees that the DER controller generates pulse width modulation (PWM) signals so that the real and reactive powers output of the microgrid track their corresponding references in the presence of sinusoidal reference inputs. The effectiveness of the proposed approach is verified through case studies, carried out on an electronically based DER in a grid-connected microgrid.
The paper highlights the need for an Active System Management (ASM) of distribution networks as a key tool for the efficient and secure integration of a high share of Distributed Energy Resources (DER). The paper prov...
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ISBN:
(纸本)9781629931333
The paper highlights the need for an Active System Management (ASM) of distribution networks as a key tool for the efficient and secure integration of a high share of Distributed Energy Resources (DER). The paper provides technical and regulatory recommendations that mainly focus on distributed generation but are also largely applicable to flexible loads, electric vehicles and storage.
Phasor measurement units (PMUs) can produce synchronised measurements with high accuracy and granularity. Currently the technology is widely deployed on transmission systems for Wide Area Monitoring, but it has genera...
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ISBN:
(纸本)9781622763153
Phasor measurement units (PMUs) can produce synchronised measurements with high accuracy and granularity. Currently the technology is widely deployed on transmission systems for Wide Area Monitoring, but it has generally not been exploited at distribution level. This paper introduces some applications that utilise synchrophasor measurements to actively manage distribution networks and release more capacity for connecting distributed energy resources (DER). These applications are considered as part of future Distributed Energy Resources Management System, which offers a range of functions for improving the operation security and reliability of modern distribution networks with high DER penetration. The paper also outlines how each application can be used in a distributed control structure - an efficient control framework for managing smart grids.
In the mobile telecommunication network, the expansion in Internet traffic will cause the demand for IP addresses. Further WiBro will also stimulate the interworking for IP addresses. In fact, many working groups are ...
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In the mobile telecommunication network, the expansion in Internet traffic will cause the demand for IP addresses. Further WiBro will also stimulate the interworking for IP addresses. In fact, many working groups are designing an adaptation mechanism between WiBro and IPv6/MIPv6. Accordingly, from the viewpoint of security, interworking between 802.16e and MIPv6 is essential. In this paper, we propose a secure and efficient OCBP (Optimized Cryptographic Binding Protocol) between Layer 2 and Layer 3 of WiBro system.
Large electrolytic capacitors are usually employed in single-phase grid-connected voltage source inverters (VSI) of distributed energy resources (DER). They are bulky and have a relatively short life time what motivat...
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Large electrolytic capacitors are usually employed in single-phase grid-connected voltage source inverters (VSI) of distributed energy resources (DER). They are bulky and have a relatively short life time what motivates their replacement by smaller film type capacitors. Resulting issues such as the increased dc bus voltage ripple and smaller inertia to active power variations are discussed in this paper. The former tends to increase the low order harmonics of the injected current, what becomes an even more challenging matter when the bandwidth of the voltage loop is increased to compensate for the latter. A solution based on a voltage ripple estimator is presented and is verified by means of simulation results.
Technology advancements in solar photovoltaics (PV) and battery storage have driven sharp increases in their employment by utilities, consumers, and third parties. These Distributed Energy Resources (DER) are often co...
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ISBN:
(纸本)9781629931333
Technology advancements in solar photovoltaics (PV) and battery storage have driven sharp increases in their employment by utilities, consumers, and third parties. These Distributed Energy Resources (DER) are often connected to the grid at the distribution level, and distribution operational requirements are being greatly impacted by their presence. Despite the potential impact of DERs on the distribution feeders, the current generation of distribution management systems has few if any available mechanisms for managing the operations of DERs. The proposed paper describes the results of an effort to address the need for enterprise integration of distributed energy resources.
Output of the photovoltaic (PV) system drastically fluctuates depending on weather conditions. Therefore users of PV systems should manage their energy usage with forecast information of the PV output. Due to the reas...
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ISBN:
(纸本)9781479979455
Output of the photovoltaic (PV) system drastically fluctuates depending on weather conditions. Therefore users of PV systems should manage their energy usage with forecast information of the PV output. Due to the reasons above, we have developed an estimation method of X% prediction interval of solar irradiance. We have achieved a high-accuracy prediction interval for any prediction coefficient X%. However, we found that there are some errors in a case where the prediction coefficient is high. In this paper, we improve the estimationalgorithm of the prediction interval.
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