Load frequency control (LFC) requires transmitting measurements from remote RTUs to center and signals the plant side. Constant delays exist in conventional dedicated communication channels, while future usage of open networks will introduce time-varying delays. Those would degrade dynamic performance LFC worst case, cause instability. The maximal delay time which allows an scheme embedded with controllers retain stable is defined as margin. This paper investigates delay-dependent stability...

The usage of remote signals obtained from a wide-area measurement system (WAMS) introduces time delays to damping controller (WADC), which would degrade and even cause instability. time-delay margin is defined as the maximum delay under closed-loop can remain stable. In this paper, introduced an additional performance index for synthesis classical WADCs flexible ac transmission systems (FACTS) devices damp inter-area oscillations. proposed approach includes three parts: geometric measure...

This paper investigates the impact of powergrid strength and phase-locked loop (PLL) parameters on small signal stability grid-connected doubly fed induction generator (DFIG)based wind farm. Modal analysis DFIG turbine under different operating conditions various power grid strengths are investigated at first. results reveal that connected to a weak may easily lose heavy-duty due PLL oscillation. The object this is identify oscillation mechanism as well influence factors propose damping...

Wide-area damping controller (WADC) requires communication networks to transmit remote signals. The usage of will introduce time delays into the control loop WADC. Ignoring this delay would deteriorate performance provided by WADC or even cause whole system instability. This paper employs networked predictive (NPC) design a for generator exciter enhance interarea oscillations in large-scale power system. NPC incorporates with generalized (GPC) generate optimal predictions, and network...

A new type of subsynchronous oscillation (SSO) has been observed recently in double-fed induction generator (DFIG)-based wind farm integrated via voltage source converter-based HVdc (VSC-HVdc) system. However, the mechanism this emerging is not entirely understood. In paper, impedance models DFIG with and without considering phase-locked loop (PLL) dynamics are both derived. Then, impedance-based simplified equivalent circuit multiple DFIGs interfaced VSC-HVdc system established. This model...

Load frequency control (LFC) of modern power systems tends to employ open communication networks transmit measurement/control signals. Under a limited network bandwidth, the continuous and high-sampling-rate signal transmission will be prone degradation LFC performance through congestion. This brief proposes decentralized standards (CPSs)-oriented event-triggered (ET) scheme for under constrained bandwidth. The proposed comprises ET CPSs-oriented regulation scheme. In scheme, rules are...

Abstract Offshore wind farms (OWFs) have received widespread attention for their abundant unexploited energy potential and convenient locations conditions. They are rapidly developing towards having large capacity being located further away from shore. It is thus necessary to explore effective power transmission technologies connect OWFs onshore grids. At present, three types of been proposed OWF integration. are: high voltage alternating current (HVAC) transmission, direct (HVDC)...

Load frequency control (LFC) of modern power systems tends to employ open communication networks transmit measurement/control signals, which makes the LFC scheme more vulnerable random time delays and time-delay attacks (TDAs). In this article, a resilient active time-delay-compensation-based is proposed compensate TDAs. At first, state observer employed estimate system. Then, networked predictive method used predict signals system in future moments. Next, an evaluation compensation for TDAs...

This paper investigates the delay-dependent stability of a power system equipped with wide-area damping controller (WADC) using new method which consists criterion based on Lyapunov theory and model reduction technique. The delay margin, maximal allows closed-loop to retain stable, is calculated reduced order linear matrix inequality (LMI) Both constant time-varying delays introduced by transmission remote signals are investigated. Cases studies carried out two-area four-machine controlled...

The increasing high penetration of wind power is bringing a serious challenge to the frequency regulation system, for turbine generators are unable naturally contribute system response. To address this problem, study proposes control strategy compensate lack short‐term response ability farms (WFs) by energy storage (ESS). First, rated and capacity ESS, which installed at point common coupling WF make it have similar that synchronous generators, determined. theoretical minimum ESS should be...

This paper develops a novel distributed iterative event-triggered control scheme for master-slave-organized dc microgrid network with limited communication bandwidth. The proposed can synchronize the voltage of multiple energy resources (DER) to their desired value. Moreover, optimal load sharing economic operation (e.g., minimize total generation cost) be achieved through low bandwidth network. designed controllers are fully and only triggered at own event time, which effectively reduces...

This paper proposes a variable proportion coefficient based control scheme for the doubly-fed induction generator wind turbines (DFIG-WTs) to implement frequency support by regulating rotor speed. To reduce adverse impact caused DFIG-WT on dynamic characteristic of grid frequency, two-stage switching is employed proposed method. In first stage, designed emulating virtual inertia provide response. second fuzzy design both quickly restoring maximum power point tracking (MPPT) operation...

This paper proposes a goal representation heuristic dynamic programming (GrHDP)-based resilient wide-area damping controller (WADC) for voltage source converter high direct current (VSC-HVDC) employing redundant signals as input to tolerate communication failure. A supervisory fuzzy logic module is proposed and added in the WADC adjust learning rate of GrHDP online when encountering Moreover, does not need accurate model power system has adaptability variation operation conditions failures....

This paper proposes a two-level combined control (TLCC) scheme of voltage source converter-based multi-terminal high-voltage direct current (VSC-MTDC) integrated offshore wind farms to provide frequency support for onshore system. The proposed TLCC consists two levels, which are the step start-up and adaptive inertial droop turbine level, communication-free allocation VSC station level. On first each adopts with coefficients, all turbines (WTs) work at maximum power point tracking (MPPT)...

The interdependency of transportation and electric power networks is becoming tighter due to the proliferation vehicles (EVs), which introduces additional difficulties in planning two networks. This paper presents enhanced solution for coordinated multiple facilities networks, including lines, roads, energy storage systems fast charging stations. In order calculate optimal proposed problem, we introduce applications linear optimization theory Karush-Kuhn-Tucker conditions, big M method, a...