It is well-known that load sharing among paralleled sources in dc grid can be achieved by droop control. However, practical factors influence the and voltage regulation are seldom discussed, like sensor discrepancy cable resistance. In this paper, impact from resistance analyzed verified experiment. To suppress factors, instead of using constant resistance, a nonlinear method proposed. proposed method, value function output current. Its increases when converter's current increases. The needs...

The architecture of an electric power system is a major determinant for the structural practicability, safety, size, weight, energy efficiency, reliability, and ultimately cost utilization. Although most these are actually quantifiable physical variables, final choice electrical when building or designing new systems is, quite logically, very often made as result either different engineering traditions experiences, higher confidence in using proven established practices. This paper examines...

This article presents a distributed periodic event-triggered (PET) optimal control scheme to achieve generation cost minimization and average bus voltage regulation in DC microgrids. In order accommodate the constraints of generators (DGs), virtual incremental is firstly designed, based on which an optimality condition derived facilitate design. To meet discrete-time (DT) nature modern systems, controller directly developed DT domain. Afterward, reduce communication requirement among...

Droop control is used in dc micro-grids to share load among multiple sources but practical factors deteriorates the performance. In this paper, impact from cable resistance and voltage regulation error analyzed. Cable introduces extra output thus changes sharing ratio while a constant current deviation. To suppress unbalance resistance, larger droop range preferred, tightness of sacrificed. The possible for system quantitative relation between derived 2-source system. worst scenarios...

In distributed generation systems, multiple inverters paralleled operation is essential for the power requirement of local loads. To achieve reasonable distribution among inverters, droop control an effective method systems without interconnection. general, multi-loop structure usually utilized to regulate drooped voltage across However, by using traditional controller, such as proportional-integral and proportional-resonant controllers, dynamic process load variation or mode transfer slow,...

Abstract Accelerating the construction of ecological civilization in industrial field and guiding transformation industry toward a green direction have become national development strategy. Promoting coordinated energy‐intensive industries such as steel, cement, power is key breakthrough achieving various industries. This study has designed steel–cement–power polygeneration system with collaborative utilization solid waste resources link point. Four scenarios, including business‐as‐usual,...

With the occurrence of major blackouts in "Australia 9·28" and "U.K. 8·9," technical bottlenecks power generation system with a high proportion renewable energy have attracted more attention. Based on this background, article studies control method that is suitable for AC microgrid strong current-limiting ability. First, outer loop controller adopts power-state equation based PI to achieve accurate tracking reference power. Furthermore, order make fault current having lower asymmetry degree...

In distributed generation, grid-connected and islanded modes are essential, but usually they have different control cores to satisfy their respective targets. Transferring between the may therefore lead prominent disturbances, if complex noticeably in structures. To introduce seamlessness, some techniques been recommended, lack unification of blocks for front dc-dc converter rear dc-ac inverter. Moreover, when connected grid, seamless do not grid current directly. Hence, its dynamics be...

Most grid-connected inverters can operate in both and islanded modes with usually different control schemes adopted each mode. The schemes, if noticeably complex different, result inrush currents voltage distortions at instants of mode transfer. An existing form droop has hence been developed from the usual to better streamline However, does not regulate grid current directly, causing it distort by harmonics respond slower during a transient. motivation here is thus propose another highly...

Control of inverter-based microgrids is typically accomplished through a hierarchical control architecture, where the lower level controllers are designed to ensure convergence desired equilibrium determined by upper controller. Selecting can be cast as an optimal power flow (OPF) problem. The OPF problems associated with microgrid applications often involve non-monotone cost functions and nontrivial reactive cost, posting new challenges for that have not been completely addressed in...

Due to the growing demand of electric power and rapid penetration electronics equipment, parallel inverter system which is connected with nonlinear loads widely exists in islanded micro-grid. The effective harmonic sharing scheme should be designed guarantee stable operation. In this paper, a negative virtual impedance introduced improve precision. chosen by an improved droop method based on relationship between inductance reactive power. Besides, voltage drop at PCC can counteracted....

Abstract A DC blocking event will cause a substantial quantity of reactive power injection into the sending-end AC grid, leading to overvoltage, which severely affects secure and reliable functioning system. Synchronous condensers (SCs) offer dual advantages capacity rapid response speed, but their output target requires about 200-500 ms, much slower than energy storage stations. Therefore, this article introduces coordinated control strategy for stations, grounded in Karush-Kuhn-Tucker...

To inhibit chattering while promoting control precision in a slidingmode (SMC) method, an adaptive quasi-sliding mode control(ASMC) method by using the technology of boundary layers wasproposed.

With the widespread application of microgrids, a number adjacent microgrids in certain area will form multi-microgrids (MMGs) with three-phase/single-phase (TP/SP) architecture. Owing to complicated structure and various operation modes MMGs, it is an urgent problem that how achieve seamless handoff between multiple MMGs. Based on analysis topology MMGs TP/SP architecture hierarchical control architecture, this study proposes islanding partition method algorithm correspondingly. The discrete...

The injected grid current of single-phase grid-connected inverter will be distorted when the voltage contain any low-order harmonics. Thus, an effective harmonic suppression method should designed to reduce total distortion for current, a novel is proposed achieve low THD. In this paper. Harmonic components extracted by fourth order band-pass filter separately and into reference output compensation. particle swarm optimization used optimize parameters double loop control better effect...

A novel current controlled scheme based on port-controlled Hamiltonian and energy-shaping control method has been proposed for the grid-connected inverter. Compared to traditional controllers, such as proportional-resonant controller, only one parameter requires be tuned in controller. Moreover, can not realize a quick tracking response, but also improve steady-state performance of injected grid whether or voltage is distorted. Simulation experimental results have validated correctness...