This article proposes a novel and easily implementable overcurrent suppression control for voltage-controlled virtual synchronous generators (VSGs). The VSG is vulnerable to grid voltage disturbances, such as dip/recovery, because it consists of source inverters (VSIs). In the worst case, caused by disturbance damages VSI. proposed can suppress not only symmetrical but also asymmetrical dip/recovery. key idea use voltages reference output voltage. requires no complicated analysis/tuning...

Permanent‐magnet synchronous motors have attracted much attention due to their high efficiency and high‐torque density. For higher control performance, finite set model predictive (FCS‐MPC) continuous MPC (CCS‐MPC) been developed. However, the former requires computing power, whereas inverter voltage saturation is not considered in latter. Therefore, this study proposes an optimal current law taking into consideration output voltage. The effectiveness of proposed method verified by...

This paper proposes a novel coordinated control method of wind farms (WFs) and hydrogen production systems (HPSs). In grid-connected system where the WF HPS are connected to grid, can supply power producing in HPS. Moreover, output fluctuation be mitigated when produces from surplus. The purpose is smooth sufficiently, produce constantly, maintain high capacity factor proposed achieves mitigation key ideas 1) utilizing kinetic energy generators 2) virtual discharge components compensated by...

This paper proposes a new filter design method that can smooth the wind power generation output while keeping energy capacity and rating of storage system (ESS) small. Wind causes frequency fluctuations in systems. Therefore, many cases, ESS is needed for smoothing generator output. In order to improve performance controlled with conventional low-pass (LPF), this investigates other types filters. First, relations between capacity/power are disclosed through worst-case study. Then,...

Dense deployment of small cell base stations (SBSs) powered by renewable energy is spotlighted as a solution the increasing demand communication services. How to utilize efficiently under temporal change traffic loads brand new challenge. In this paper, we design real-time controllers for zooming, that is, determine transmission power and activation/deactivation harvesting SBSs. The proposed method maximizes total number accommodated users, considering remaining energies batteries. First,...

This article addresses a controller for full converter of variable-speed wind generators composed permanent magnet synchronous generators. Conventionally, several proportional-integral (PI) controllers and phase-locked loop (PLL) are used in the voltage-oriented control. The use cascaded control loops with PI degrades performance due to windup integrators complicates tuning task. In this article, we propose new scheme based on predictive single P-controller αβ stationary frame replace PLL....

This paper proposes a novel control approach to reduce the rated power of energy storage system (ESS) in smoothing wind output. Wind generation causes frequency fluctuations systems. Therefore, ESSs are used absorb fluctuating generators. Generally, controller an ESS is composed first-order low-pass filter (FLF) with large time constant. However, FLF incurs high cost because its phase-lag induces unnecessary increase ESS. study addresses reduction without using complex controller. First,...

Passive power filters are indispensable for grid-connected inverters (GCIs) to eliminate current harmonics. However, typical require large inductance, which not only increases the filter dimension and costs but also leads slower response a high voltage drop across filter. This article proposes novel called LCTCL filter, effectively attenuates harmonics with small inductance. In addition, this presents controller synthesis GCI without an additional resistor. We demonstrate effectiveness of...

Hydrogen production using wind power generation system is very effective for solving the energy supply problem in future. Many strategies have been proposed operation of a grid-connected farm. But method stand-alone farm has not studied sufficiently so far. There are many places with good condition but without connectable grid, where can be attractive. This paper proposes control hydrogen generator.

This paper proposes a new method to suppress frequency variations of power system with large amount wind installed by using the kinetic energy generators. In recent years, environmental problems have been becoming serious and generation less impacts has attracted much attention introduced. Since is an unstable source in which its output fluctuates due speed variations, generator must be smoothed when supplied system. control variation increasing or decreasing only exceeds specified threshold...

Hydrogen production using wind power generation system is very effective for solving the energy supply problem in future. Many strategies have been proposed operation of a grid-connected farm. But method stand-alone farm has not studied sufficiently so far. There are many places with good condition but without connectable grid, where can be attractive. This paper proposes control hydrogen generator.

This study presents a model predictive-based current control for permanent magnet synchronous motors (PMSMs). In the authors' proposed approach, reference voltage to an inverter can be strictly treated as discrete vector so that output saturation of is avoided. Various constraints also taken into consideration in their approach. Designing band frequency incorporated single objective function. The effectiveness method verified through simulations and experiments.

This paper analyses the frequency characteristic of power system and apply result to wind farm output smoothing control, which uses inertial energy generators is designed based on a notch filter. It concluded that proposed method can control variations due with small loss.

Position-sensorless positioning servo systems for interior permanent magnet synchronous motors (IPMSMs) have been developed to achieve dimension and cost reduction. In these systems, parameter mismatch between the IPMSM, position controller, estimator due thermal variation aged deterioration is inevitable. To solve this problem, a identification method based on an adaptive scheme has proposed. However, use scheme, can only be applied under no-load conditions, it difficult compensate...

In the robust performance design, celebrated μ-synthesis provides a reputed tool for systems with norm-bounded uncertainty. However, such small-gain methods inevitably limit achievable when dynamic uncertainty is not characterized by its gain bound. To achieve high positive real (PR) uncertainty, an output strict passivity (OSP) approach proposed recently which makes use of realness and maximum information Aiming at even higher performance, this article proposes novel model PR uncertainties...

Wind power generation as well hydrogen energy have attracted much attention a solution for solving the problem in future. Though many strategies operation of grid-connected wind farm been proposed, method stand-alone has not studied sufficiently so far. There are places with good condition but without connectable grid, where can be very attractive. This paper proposes production system composed generators and electrolyzer.

Renewable energies having little effect on the global environment have been attracting much attention. Among them, wind power has introduced widely. However, output of generation is unstable, and thus it can bad influence system operation. Therefore, control introduction or battery for smoothing unstable required. In this paper, a new method frequency proposed which based band farm by using variable speed generators.

Abstract This paper proposes a novel optimization method for energy storage systems (ESSs) to smooth wind farm output satisfy the technical requirements and reduce rated power (rated capacity) charge/discharge loss of ESS. The state charge ESS operated by proposed can be regulated, guaranteeing some constraints. has very simple structure, does not require forecast numerical optimization, such as particle swarm optimization. Therefore, high‐grade functional computation device is needed....

In recent years, it is required to extend the operation regions of induction motors (IMs) even at low-speed in regenerating while maintaining a high control performance. Conventional rotor speed estimation methods using an adaptive flux observer are unstable regenerating, particularly near zero frequency. this paper, we propose simultaneous method and stator resistance improve performance speed-sensorless vector IMs. addition, prove that proposed stable regenerating. Furthermore,...

Abstract In robust control problems, how to elicit and utilize the uncertainty information is key in achieving a good performance. For passive uncertainties, phase bound plays fundamental role. nonpassive gain used up date. The former leads passivity approach later small‐gain approach. A recently developed bounded positive real model succeeded extracting both from uncertainties. However, it still not known of uncertainty. Aiming at an even higher performance for uncertain systems, this...

Three-phase PWM converter is commonly connected to utility grid through L or LCL filter remove current harmonic components. has many advantages compared with filter. However, resonance at high frequency caused by the may lead stability problem. Passive damping method (PD) active (AD) used solve this PD brings additional loss due resistor. On other hand, virtual resistance of AD, in general, needs sensor. Therefore, paper proposes sensorless for grid-connected three-phase

Recently, wind power has been attracting much attention because of its positive effect on the global warming. However, generation causes frequency variations in electric system. Therefore, battery systems for smoothing fluctuations generator output are needed. Though control with simple low-pass filter (LPF) have reported so far widely, filters other than LPF not studied sufficiently. This paper proposes a new method designing energy capacity and system type filter, which is based characteristics