Since the input power of real waves varies continuously and periodically, how to stabilise operation generation during wave energy utilisation has become an inevitable significant topic. This study focuses on converter a hydraulic take‐off (HPTO) connected pendulum studies influences key components, i.e. high‐pressure accumulator, oil tank flow control valve, operational stability HPTO by simulations experiments. Parameters accumulator are analysed optimised. The dynamic performance with or...

Renewable energy generation technology, as an alternative to traditional coal-fired power generation, is receiving increasing attention. However, the intermittent characteristics of wind and solar pose certain challenges stable operation grids. This requires a better understanding operational renewable improve comprehensive efficiency. To achieve this, firstly, four indicators (i.e., average fluctuation magnitude, Richards–Baker flashiness, climbing rate, change in time-averaged value)...

The pressure fluctuation has multiple influence on the steady operation of Francis turbine, and impact degree varies with condition. In this paper, for analysis in a novel feature extraction method multidimensional frequency bands energy ratio is proposed based Hilbert Huang Transform (HHT). Firstly, signal decomposed into intrinsic mode functions (IMFs) by EEMD. Secondly, marginal spectrum utilized to analyze characteristics IMFs. Then, according inner IMFs, each them divided high, medium,...

A novel, inverse-pendulum wave energy converter (NIPWEC) is a device that can achieve natural period control via mass-position-adjusting mechanism and moveable internal mass. Although the capture capacity of NIPWEC has already been proven, it still meaningful to research how effectively in real time for maximum absorption irregular waves. This paper proposes multi-timescale lookup table based power point tracking (MLTB MPPT) strategy NIPWEC. The MLTB MPPT was implemented theoretical “optimal...

The power take-off system plays a vital role in the wave energy generating unit. Here, for studying operation characteristics and methods of hydraulic system, its basic model is built relying on operating principles every component. Meanwhile, proportional–integral–derivative (PID) controller also designed to regulate rotational speed motor. Then, test platform constructed verify correctness model. Fortunately, based analyses, some useful results are found. Firstly, PID has visible effect...

Hydraulic power-take-off (PTO) systems which utilize high-pressure oil circuits to transmit energy are widely applied in wave generation. The properties of hydraulic significantly influenced by environmental conditions, and its dynamic viscosity is sensitive temperature, especially relatively low-temperature cases. This paper studies the characteristics PTO when started different temperature conditions via numerical analysis experimental verification. An improved model system proposed,...

Abstract Constant pressure hydraulic power take-off (CPHPTO) utilizes a high-pressure accumulator to weaken its oil fluctuations. However, CPHPTO operating point still changes violently under the circumstance of changeable irregular waves as well limited volume accumulator. This causes work away from designed and even run in inefficient unstable region. paper proposes speed-and-pressure combined control (SPCC) strategy, which keeps system speed/pressure around value via vector PMSG or...

Multi-energy complementary microgrid systems can take advantage of the characteristics various types energy sources, improve utilization efficiency, increase economic benefits, reduce cost electricity, and carbon emissions. This work takes new multi-energy system as an example. The model including wind power, photovoltaic, electrochemical battery storage system, gas generator set. industrial project in Pakistan a practical case. And maximizing benefits at lowest optimization goal, is modeled...

The localized intelligent secondary equipment arranged in the substation is often directly installed near high voltage side. And high-voltage substations' side gathered large amount of electronic equipment. In gas insulated switchgear (GIS) environment, electromagnetic interference (EMI) at certain moments will exceeds threshold specified standards. This work tests transient and steady-state EMI different rate. revealed harsh affect immunity electrical

The efficacy of the multi-timescale lookup-table-based maximum power point tracking (MLTB MPPT) in capturing energy at various fixed sea states has already been demonstrated. However, it remains imperative to conduct a more comprehensive evaluation MPPT performance under varying practical scenarios. Additionally, is crucial engage an in-depth analysis dynamic process and loss/consumption associated with MLTB implementations. This paper focuses on implementation simulation for variable...

Some optimized combination of stator/rotor-pole number are presented in this essay with a view to suppressing the torque ripple four-phase doubly salient PM machines (DSPMMs). Firstly, is discussed reveal its principle impact on cogging and back-electromotive force (back-EMF). Then, related features three DSPM 16/12-, 16/11-, 16/13-pole combinations compared essay, including electromagnetic characteristics as no-load flux linkage, torque, back-EMF, losses, efficiency. It can be found that...

The stabilization of power take-off (PTO) is imperative especially under circumstances fluctuating input wave energy. In this paper, a flow control valve introduced to optimize the transient process hydraulic PTO, which can contribute quicker adjustment and stronger stability. Under variations load torque in process, an open-loop method closed-loop are proposed as opening law above valve, motor speed, pressure at accumulator inlet generated chosen indicators examine regulation performance....

With the increasing voltage level of smart grid, electromagnetic environment substation is getting more complex. The electronic devices placed on high side often impacted by severe interference (EMI). In northeastern or southern China, secondary in could withstand harsh natural temperature. international standards compatibility (EMC) and environmental reliability are tested separately, without considering their comprehension affect. However, simulation current transformer acquisition card...