This paper proposes a method for coordinated sizing of energy storage (ES) and diesel generators in an isolated microgrid based on discrete Fourier transform (DFT). ES have different response characteristics can complementarily compensate the generation-demand imbalance at time scales. The DFT-based dispatch strategy allocates balance power between two components through frequency-time domain transform. proposed ensures that work their respective most efficient, fit way. Diesel consecutively...

The presence of distributed generation (DG), represented by photovoltaic and wind generation, brings new challenges to distribution network operation. To accommodate the integration DG, this study proposes a bi‐level optimisation model determine optimal installation site capacity battery energy storage system (BESS) in network. outer determines BESS aiming at minimising total net present value (NPV) within project life cycle. Then power flow (OPF) adjustment are implemented inner...

The region-based method has been successfully applied in transmission systems. This study proposes the definition, model and applications of security region for distribution With ongoing smart grid initiatives, a large amount real-time network information will be available. is motivation an accurate calculation boundary. First, this presents concepts system (DSSR); discusses N−1 contingency scenarios both substation transformers feeders. Second, boundary modelled Euclidean space as several...

This paper observes the boundary of distribution system security region (DSSR). DSSR is defined as a set all operating points satisfying N-1 constraints. First, basic concepts are introduced for under smart grid background. Then, dividing phenomenon reported, which indicates that given network exists. Moreover, an approximation method based on simulation proposed in order to find boundary. observation results presented expanded reliability Busbar test BUS4 case. The topological...

This study systematically proposes and defines a set of new quantitative indices named total supply capability (TSC) its associated indices, such as available capability, substation network transfer maximum expandable capability. The concepts in the TSC family provide approaches to analyse optimise distribution networks. for systems is comparable transmission systems, but there are significant differences, radial configuration service restoration consideration. defined load serve under...

This paper presents the mathematical definition and deduction for distribution system security region (DSSR), which lays a foundation DSSR theory. The is set of all N-1 secure operating points in state space system. First, this proposes strict DSSR, defines that can be called "region" only if three conditions are satisfied. Then, deducted, based on proved existing mathematically deducted. As basic feature future smart with distributed energy resources, bidirectional power flow fully...

Situation awareness (SA) refers to the process of perception, comprehension, and state projection system, elements, environmental factors within a volume time space. The security assessment is an important part SA for distribution networks. In this paper, system region (DSSR) used first time, method based on distance (SD) proposed. First, existing DSSR, which defined as set all operating points (OPs) satisfying N - 1 criterion, paper supplements 0 DSSR normal constraints. Second, calculate...

As an important tool of transmission system dispatching, the region-based method has just been introduced into distribution area with ongoing smart grid initiatives. First, a more accurate security region (DSSR) model is proposed. The proposed based on detailed feeder-interconnected topology, and both substation transformer feeder N-1 contingencies are considered. Second, generic characteristics DSSR discussed mathematically proved. That is, dense set which boundary no suspension can be...

The region-based method has been applied in transmission systems and traditional passive distribution without power sources.This paper proposes the model of total quadrant security region (TQSR) for active networks (ADN) with high penetration distributed generation (DG).Firstly, TQSR is defined as a closed set all N-1 secure operation points state space ADN.Then, modeled considering constraints space, normal criterion.Then, characteristics are observed analyzed on test different DG...

This paper proposes a new planning method for interconnected smart distribution networks based on total supply capability (TSC), which provides better utilization of existing assets. The specific five steps the proposed TSC-based are: 1) analysis power problem; 2) calculation TSC value; 3) verification and adjustment load; 4) between distributed each feeder 5) N-1 simulation. load allocation problem is solved with model that capable searching optimized considering security constraints. Two...

In this article, a new concept of flexible distribution network (FDN) is proposed for the power grid with increasing distributed energy resources (DERs) and electronic devices. First, authors define FDN as closed‐loop operation smart capability wide‐area exchange. FDNs, networking devices are key facilities, which upgrade traditional by soft open point (SOP). Second, several typical configurations presented, facilitate smooth upgrades from networks to FDNs. Third, normal mode, N − 1 related...

A multi-scenario, multi-objective optimization method of a grid-parallel Microgrid (MG) is presented aiming for more comprehensive and accurate assessment MG. First, different operational modes MG are analyzed sorted. Normally, the will connect with energy deliver system most time, providing functions such as peak shaving, reserve. But it also required to operate separately from grid in planned or unplanned island mode due reasons, e.g., power outage, abnormal weather. Then, size based on...

Efficiency pursuit of the distribution system operation should be on premise security. This study proposes network reconfiguration (NR) approach comprehensively considering N −1 security and loss. A new called region (DSSR) is first applied in NR problem. The DSSR feasible space a within criterion can quantify margin. Then, formulated by using minimum loss as objective function margin, which provided DSSR, constraints. Moreover, margin constraints customised for each feeder individually,...