Utilizing the flexibility provided by thermal system components, for example, pipelines in district heating network (DHN), building envelopes as well energy storage (TES) devices, can be an effective way power to solve wind curtailment problem which closely relates limited of combined heat and power. However, almost all previous studies ignored transfer (HT) constraints when modeling these abovementioned components. An HT constraint is one most important analysis, without considering it may...

Due to the coupling of its heat and power output, combined (CHP) has limited flexibility, which is one main reasons for variable renewable energy source (RES) curtailment problem in Northern China. Almost all existing studies have modelled CHP's output characteristics as a feasible operation region electric power. However, only extraction steam CHP unit that used district heating can be controlled directly, without considering steam's transfer process, actual cannot precisely decided. Thus...

To cope with the uncertainty and variability of wind power, it is important for power system to maintain adequate reserve capacity. The energy storage ability district heating (DHS) provides considerable flexibility combined heat (CHP) units, hence CHP can also participate in capacity service. However, operation restricted not only by its condition, but DHS which brings difficulty quantifying flexibility. This paper focuses on properly assessing utilizing available units as well addressing...

Heat transfer (HT) is a major constraint in thermal system analysis. However, when discussing utilizing the flexibility provided by heating sector, for example, using energy storage (TES) to increase operational of combined heat and power (CHP), HT process often ignored. This may mean infeasibility resulting schedules. In response this, this paper proposes general TES model which takes detailed analysis into account. By setting relevant parameters, can be used describe both sensible (SH)...

Introduction of electric-heat conversion and heat transfer/storage (EHCHTS) units into power systems is a feasible solution to reduce the curtailment renewable energy resources in supply green way simultaneously. However, different transmission natures electricity make it complex difficult analyze optimize system with EHCHTS units. This paper constructs current model district heating network including an unit applies Ohm's Kirchhoff's laws deduce corresponding transport matrix, which further...

Combined heat and power (CHP), with its limited flexibility, is one of the leading causes for curtailment problem variable renewable energy source (VRES) in Northern China. To increase flexibility CHP, thermal storage (TES) considered to be an effective solution, a phase-change TES demonstration pilot project now being constructed Almost all previous studies have modeled device without considering transfer process, which main constraint system analysis. Thus, this contribution, we consider...

In power system electromechanical transients, wind (WP) with electronic interfaces is more capable of controlling active compared to synchronous generators (SGs), but less voltage. WP beneficial transient rotor angle stability because it improves the deceleration SG, detrimental voltage stability. A mechanism inducing instability studied. The fast dynamics related control transients can be neglected, and simplified static injection model in transients. modelled balance algebraic equations,...

Employing thermal energy storage (TES) for combined heat and power (CHP) can improve flexibility in an integrated electric-thermal system (IETS) therefore is beneficial to the accommodation of variable renewable sources (RESs). In general, there are two kinds storage: active (ATS) passive (PTS). Active capacity, provided by devices designed special purposes, generally fully exploited; defined as TES capacity components such pipelines building envelopes, has yet be employed. To explore...

It is difficult to choose a best feature subset for the power system transient stability assessment (TSA) problem, and existing data mining methods TSA lack sufficient considerations these situations that wrongly classify unstable samples as stable ones. In response deficiencies, this paper proposes multi-support vector machine (SVM) method based on relief algorithm. Firstly, proposed selects several subsets with different size algorithm, then uses selected SVM training, finally, trained...

Heat storage (HS) instalment in combined heat and power (CHP) plants is a promising solution to increase the adjustability of CHP reduce renewable energy curtailment. Despite proposed optimisation models algorithms, it still lacks dispatching framework for HS facilities integrate with existing system grids. This study integrates coordination control (CCS) plant‐level management (PEMS) into proposes corresponding scheduling method ensure rationality, veracity, timeliness scheduling. The CCS...

Voltage stability is an important issue to be considered in power system with large scale wind integration. The mechanism of transient voltage instability induced by studied. A variable speed turbine can control the rapidly and flexibly electronic convertors. fast dynamics related transients neglected, simplified static injection model electromechanical transients. modelled balance algebraic equations, dynamic equations are differential equations. trajectory encountering a singular point...

Electrical heating with thermal storage using surplus wind power is now promoted in northern China for accommodation and clean heating. This paper presents the results of a study on modeling electrical system. Based entransy dissipation-based resistance theory, heat source, exchanger, pipeline load system are modeled from perspective thermo-electricity analogy method two different models given. The controllable enhancing flexibility model can effectively describe its dynamic response characteristics.

An effective way to solve the problem of wind power curtailment is install heat storage (HS) facilities in CHP plants. However, existing grid does not have ability schedule facilities. In this paper, we developed combined and dispatching system plants as well for maximum effect accommodation. The results show that cooperating with scheduling system, has fine-tuned initial schedules adjustment achieve desired improving consumption. Meanwhile, amount HS facility limits capacity increasing...

This paper describes a rule-based placement technique, which plays key-role in the automatic layout system for Printed Wiring Boards. It is based on classification of bus-structures and other functional or structural features PWB's.

In order to achieve the grid line online fault warning, we used operational reliability theory generate power data, and then use decision tree method establish relationships between pre-fault data fault, corresponding warning rules, simulation results show that can effectively which provides useful information for operators guarantee security of system.

The mode information of the low frequency oscillation (LFO) is vital importance for security and stability power system. In this paper, we propose a method to identify parameter using correlation function ambient data based on random response theory We studied general procedure method. By comparing with widely used ARMA method, find that equivalent Prony deal data, which means special case theory. A practical model order selection analysis also given. result from simulation system an actual...

Abstract Two extreme cases of static stability are voltage and power angle stability. The general analysis only focuses on one the or limit state change studied for a certain kind characteristics. In this paper, limits derived, respectively. Therefore, different characteristics their interrelationships can be further studied. index to judge dominant characteristic is defined. proposed needs system wide‐area measurement information quickly accurately instability (DI) in paper equal 1 −1,...