Wind power can effectively alleviate the energy crisis. However, its integration into grid affects quality and stability. Accurate wind speed prediction is a key factor in efficient use of power. Because intermittent nonstationary nature, forecasting difficult, topic much research, especially long-time multistep forecasts. In this paper, problem regarded as sequence-to-sequence mapping problem, model based on transformer proposed. This an encoder–decoder architecture, where encoder generates...

Droop control is a common method in the universal microgrid applications. Conventional droop unpractical for low-voltage microgrid, where line impedance among distributed generation units (DGs) mainly resistive to generate active and reactive power of DG coupled. Besides, accurate sharing not achieved due voltage deviation DGs caused by disparate microgrid. An improved based on virtual source (VPS) composite impedance, which constituted negative resistance inductance, proposed The...

Emerging studies have revealed the potent functions of circRNAs in breast cancer tumorigenesis. However, biogenesis, biofunction and mechanism triple-negative (TNBC) are largely unknown.High-throughput RNA sequencing was applied to identify dysregulated TNBCs paired normal tissues. pulldown luciferase assays were performed investigate interaction between circular CD44 (circCD44, also annotated as hsa_circ_0021735) miR-502-5p. RIP used circCD44 IGF2BP2. Cell viability, colony formation,...

To improve the voltage and power sharing of distributed generations, hierarchical controls are widely used in microgrids while dependent communication network makes it difficult to ensure performance under limited bandwidth. In this paper, a predictive controller is designed. With delayed secondary PI compensation signals, an inner-loop robust control designed primary controller, ensuring stable tracking. Then, provide neighbor local predictions, such that data integrity improved by accurate...

A multiagent system based distributed cooperative control is proposed for a dc microgrid. First, the scheme built, where each energy resource unit associated with first-level agent to deal primary and secondary-level agents implement secondary control. For purposes of global voltage regulation proportional current sharing, both regulators are installed in agent. Their consensus protocols designed by using state information exchanged among only adjacent on switching topology communication...

Voltage regulation is imperative for the successful operation of electricity distribution networks, especially with a high penetration level photovoltaic (PV) systems. Power compensation control (PCC) that uses both reactive power and active curtailment has shown promising results in alleviating voltage rise problems. It crucially relies on real-time communications among distributed PV However, transmission state measurements signals PCC hampered by inevitable communication delays....

In distribution networks with a high penetration of photovoltaic (PV), coordination between reactive power compensation (RPC) PV inverter and active (APC) battery energy storage system (BESS) is always used in voltage regulation (VR). Since using periodical VR inevitably increases communication utilization, how to design new event-triggered one reduce burden while achieving comprehensive governance the required minimum BESS sizing? Therefore, an hybrid method proposed this paper. Firstly,...

Frequency deviation and powers sharing error exist in a microgrid with multiple droop-controlled distributed generations. To solve the above problems, we propose an event-triggered multistage secondary control. First, to improve synchronization accuracy, divide control into stages based on frequency/voltage droop characteristics. The inputs of proportion-integration compensator for these are different. corresponding stage will be activated when value meets certain "event" (given ranges)....

In distribution networks with a high penetration of photovoltaic (PV), the intermittency is easy to cause regional voltage violation issue. Network-wide power compensation always used mitigate this issue while lacking refined regulation (VR). This brief proposes coordinated VR algorithm that uses proportional PV inverter and battery energy storage system (BESS) based on sensitivity. With shared burden among all inverters BESSs, solved without using network-wide controllable resources....

In order to improve bus voltage profile in active distribution networks with high penetration of photovoltaics (PV) and electric vehicle (EV), this paper proposes an event-triggered multi-time-scale regulation method. Under a designable triggered mechanism driven by changes power flow, sensitivity-based centralized hybrid compensation PV EV is used alleviate long-term offset throughout trigger intervals. Then, dispersed local or additionally reduce short-term fluctuation at involved...

In this article, a cyber-physical cooperative control strategy is proposed for islanded microgrid (MG), which divides the MG into cyber and physical layers. And main designs in these two layers are event-triggered mechanisms, where one mechanism used to improve voltage frequency stability of considering packet loss problem, other reduce communication burden process. More specifically, process first can be understood as we use mechanisms complete secondary layer based on information layer....

To settle reactive power sharing inaccuracy among distributed generations (DGs) associated with mismatched lines impedance, a hierarchical control strategy in the framework of multi-agent system (MAS) is proposed. Replace DG by virtual source (VPS) droop and synchronize VPSs voltages control. Initially, primary control, improve line feature defining impedance value, so that are roughly consistent. Then, design VPS voltage evaluation index based on outputs, whose trigger determines whether...

Accurate renewable resource and load forecasting plays a key role in the progress of power grid planning schemes. In this study, hybrid short‐term method based K ‐means clustering variational mode decomposition (VMD) technique is proposed to deal with problem accuracy. means data mining approach used for classifying into several clusters. A cluster selection adopted extract similar features from historical days. To better analyse time series data, VMD decomposes an ensemble components...

Fluorescent berberine-based carbon dots (Ber-CDs) were prepared through a facile synthesis strategy. Ber-CDs exhibited excellent optical properties for bioimaging and retained the biofunctions of berberine, enabled selective safe anti-tumor performance, demonstrating their promising application potential in cancer theranostics.

Nowadays, with the development of communication technology and its application in islanded microgrid, pure power grid has gradually become a kind cyber-physical system. In this system, data consensus algorithm are widely used secondary control energy resources. However, process, there also risks network attacks, such as denial service attack. To deal attack existing uploading channel during control, evolutionary game-based defense mechanism is designed, main works follows: firstly, caused...

Voltage is a key operation index for active distribution networks. Coordinated power compensation of distributed energy resources (DERs) has shown promising results in alleviating voltage violation. Most methods use global optimization to obtain the optimal network-wide available resources, which becomes unfair when solving same issue regional buses. Refined coordination DERs on buses not been formed as well. Therefore, this paper proposes sensitivity-related hybrid algorithm. In order fully...

The curtailment of photovoltaic (PV) power injection is one the ways to mitigate overvoltage issue in residential distribution networks with high levels PVs. reactive compensation (RPC) PV inverter, when applied conjunction active (APC) battery energy storage system (BESS), more effective improving voltage profile. Hence, a coordinated algorithm (PCA) proposed this article regulate and reduce while serving requisite load demand. Both RPC APC are integrated improve regulation margin...

In the multi-microgrid system, once a microgrid is severely disturbed into alert or emergency state, effective multi-mode management method necessary to make system restore balance of supply and demand rapidly. Therefore, hierarchical strategy proposed in this study, which includes three steps:1. The first step predict fit support capacity neighbor microgrids determine whether these need participate support, constitutes upper layer. To end, an event-triggered mode considering multi-source...

In this paper, a hierarchical distributed coordinated control method is proposed based on the multi-agent system for dc ring-bus microgrids to improve bus voltage performance. First, two-level built, where each first-level unit agent associated with energy resource implement local decentralized control, and second-level coordination together agent. Afterward, assessment index of subsystem established. By index, can judge whether should or control. Furthermore, by means both controller are...