Shuai Lu

Southeast University (China) | SEU · School of Electrical Engineering

The heat and electricity integrated energy system (HE-IES) has high energy efficiency and bright application prospects. In the HE-IES, the heat transmission in the heating network and the indoor temperature variation in the buildings are governed by (partial) differential equations, which bring the heat dynamics problem in the system operation. In...

Integrated energy systems (IESs) are composed of multiple heterogeneous subsystems, i.e., electrical power system, natural gas system, and district heating system (DHS), which endow the whole system with excellent performance in overall efficiency and renewable energy utilization. The paper aims to offer a concise and analytical model for the therm...

The integrated energy systems (IESs) that combine multiple heterogeneous energy systems such as power, natural gas, and district heating systems, are believed to have high potentials in future energy systems owing to their advantages in economy, energy efficiency, and promoting renewable energy consumption. The complicated hydraulic and thermal ope...

The thermal inertia of buildings brings considerable flexibility to the building heating and cooling loads, which is believed to be a promising demand response resource in energy systems. However, it is challenging to utilize the thermal inertia of buildings in the operation of energy systems because of the complicated thermal dynamics and high com...

Integrated energy system (IES) flexibility can serve the improvement of power system adjustability under the high proportion of renewable energy. However, the mechanism of IES flexibility is complex and its connotation is rich, there is still a lack of unified understanding and systematic elaboration. Firstly, the research status of power system fl...

The decoupling method, in which different energy vectors are solved alternatively, is widely adopted in the integrated electricity and gas systems (IEGS) analysis. Nevertheless, the bidirectional interaction created by power to gas (P2G) and gas turbines (GT) requires iterative calculations between the electric power system (EPS) and the natural ga...

p>Energy flow analysis is a fundamental tool to determine the network states of the integrated energy systems. For the widely deployed IES with coupled power grids (PG) and heating networks (HN), we still lack a generic tool that can be easily employed to calculate its quasi-dynamic energy flows. In this paper, we have developed a generic code pack...

p>Energy flow analysis is a fundamental tool to determine the network states of the integrated energy systems. For the widely deployed IES with coupled power grids (PG) and heating networks (HN), we still lack a generic tool that can be easily employed to calculate its quasi-dynamic energy flows. In this paper, we have developed a generic code pack...

The wide promotion of electric heating has necessitated the combined analysis of the electric power system (EPS) and the district heating network (DHN) for economic and secure improvement. However, the flexibility of DHN brought by thermal dynamics is governed by partial differential equations (PDE), which is difficult to be accurately quantified....

Simulation and operation optimization studies on the integrated energy system have received extensive attention recently for its potential in improving energy efficiency and increasing grid integration of renewable energy, where the task of energy flow calculation serves as a fundamental tool to determine the network states. This paper investigates...

The dynamic simulation of the integrated electricity and gas system (IEGS) is effective for accurate operational guidance. However, the IEGS model governed by partial and ordinary differential-algebraic equations (PDAE) is challenging for analysis, because it poses heterogeneous properties, high dimensionality, and strong nonlinearity. To eliminate...

The worldwide promotion of electric heating improves the operational flexibility of the power system (PS), but it also increases the risk of cascading failure due to the bi-directional interaction with the heating system (HS). To anticipate these contingencies timely and guide the post-outage adjustments, the steady-state security region (SSR) of t...

This paper proposes a doubled-sided auction mechanism with price discrimination for social welfare (SW) maximization in the electricity and heating market. In this mechanism, energy service providers (ESPs) submit offers and load aggregators (LAs) submit bids to an energy trading center (ETC) to maximize their utility; in turn, the selfless ETC as...

Distributed secondary control stands out for its flexibility and expandability in microgrids (MGs) control, in where communication network plays a fundamental and critical role. The communication topology and link-weights have significant impact on the attack-resilience and dynamic performance of MGs, which should be appropriately designed. However...

Potential weak spots of cyber security of district heating system in integrated energy systems were reviewed. • Three specific methods and models of cyber-attacks against district heating system are proposed. • Comprehensive analysis framework combining optimization dispatch and simulation for cyber-attacks are presented. • Impact of the proposed c...

Intensive use of photovoltaic (PV) inverter in volt/var control (VVC) methods in active distribution networks can impair inverter reliability. To this point, this paper proposes a PV inverter reliability-constrained (PiReCon-) VVC method with a power smoothing scheme under uncertainties. Firstly, considering impacts on inverter reliability, new rel...

Quasi-dynamic energy flow calculation is an indispensable tool for the heat and electricity integrated energy system (HE-IES) analysis. One solves the nonlinear partial differential algebraic equations to obtain thermal, hydraulic and electric variations. However, mainstream iteration solvers face the challenges of inefficiency and bad robustness....

Water resources are vital to the energy conversion process but few efforts have been devoted to the joint optimization problem which is fundamentally critical to the water-energy nexus for small-scale or remote energy systems (e.g., energy hubs). Traditional water and energy trading mechanisms depend on centralized authorities and cannot preserve s...

The operational stability and economy of the multi-energy systems (MES) are threatened by various uncertainties, such as variable renewable energy power, energy demands, and weather conditions. Most of the existing methods for the dispatch decision of MES are based on the prescribed probability distribution or uncertainty sets of the random variabl...

Energy flow calculation plays a vital role in the analysis, operation, and control of heat and electricity integrated energy systems (HE-IESs). The quasi-dynamic energy flow models of HE-IESs are essentially partial differential equations (PDEs) (governing thermal inertia) and non-linear algebraic equations (AEs) (governing temperature, hydraulics,...

An accurate dynamic model of district heating network (DHN) is significant for the operational analysis in the heat and electricity integrated energy system (HE-IES). The thermal dynamics in DHN are described by the partial differential equation (PDE) with initial-boundary values, which is often solved by numerical methods or approximately analytic...

Modeling of district heating network (DHN) is significant for the dynamic simulation of the heat and electricity integrated energy system (HE-IES). However, the computational accuracy and stability of the DHN model have not been fully addressed in traditional numerical methods. This paper proposes a novel DHN model to describe the thermal dynamics....

Facing the dilemma of growing energy demand and mitigating carbon emissions, this paper proposes an energy sharing mechanism based on virtual federated prosumers (VFPs) with budget allocation for joint electricity and carbon market to incentivize distributed energy resources to participate in the hierarchical market and reduce carbon emissions. At...

As the basic research of multi-energy network analysis, the unified modeling and calculation methods have been proposed in time and frequency domain. To compare the application effects of each model in various scenarios, this paper analyzes different models through theoretical analysis and numerical simulation. First, the analytical form of the ini...

Intensified interaction between electric power system (EPS) and district heating network (DHN) has raised an urgent requirement of security control to ensure the regular operation of the heat and electricity integrated energy system (HE-IES). However, the implicit expressions of thermal dynamics remain an obstacle to building the quantitative relat...

Wide development of electric-thermal conversion equipment has promoted renewable energy penetration in the electric power system (EPS) and brought considerable environmental benefits. However, different physical natures of heat and electricity complicate the comprehensive analysis for the operational features in district heating networks (DHN). Thi...

The heat and electricity integrated energy systems (HE-IESs) have a bright prospect in future energy systems owing to their excellent economic and environmental performance. Many uncertain factors in the HE-IESs, such as renewable energy sources, electrical load, and weather factors, threaten the se-cure and economical operation of systems as well...

A power to hydrogen and methane (P2HM) plant can couple three different energy sectors including electricity, natural gas, and hydrogen, showing great potentials in supporting the penetration of renewable energy sources. This paper develops a bi-level strategic bidding model of a profit-driven P2HM plant from both market and technology perspectives...

Wide development of the heat and electricity integrated energy system (HE-IES) has provided flexible multi-energy optimization management, which improves energy efficiency and benefits the environment. It is essential to calculate energy flow quickly, accurately, and reliably as the system scale and complexity increase. To handle this problem, we p...

The integrated energy system (IES) has bright prospects in engineering applications for its excellent performance in energy efficiency and renewable energy consumption. In the IES, the thermal comfort is affected by the heating power, buildings parameters, and outdoor temperatures simultaneously. Therefore, the uncertainty of outdoor temperature wi...

The increasingly wide application of technologies such as combined heat and power (CHP) systems and micro energy management systems has enhanced coupling of various types of energy. In this paper, a generalized Nash game model is built in this paper to simulate the multi-round auction in combined heat and power market (CHPM). In this model, the con...

For the future development of an integrated energy system (IES) with ultra-high penetration of renewable energy, a planning model for an electricity-hydrogen integrated energy system (EH-IES) is proposed with the considerations of hydrogen production and storage technologies. In this EH-IES, a reasonable power to heat and hydrogen (P2HH) model with...

The IES (Integrated Energy System) integrates multiple energy subsystems, i.e., electrical system, gas system, heating system, and so on. The dynamic/static characteristics and device control characteristics of different energy systems are significantly different. In order to realize coordinated operation of the heterogeneous energy networks and de...

The increasing penetration of variable renewable energy sources (RES) such as wind power and photovoltaic cell in the microgrid poses a great threat to the power balance. The microgrid operator has to consider the system operational flexibility in the dispatch to overcome the uncertainties. For a multi-energy microgrid, the coupling relationship an...

This paper proposes a two-stage planning and design method for the multi-energy system (MES), which consists of multiple combined cooling, heating and power (CCHP) systems connected by the district electrical network and district heating/cooling network. In the first stage, the optimal objective is to minimize the annual capital and operating costs...

Significant growth in gas-fired combined heat and power units worldwide has enhanced the degree of interdependency between power, natural gas and district heating systems. This study establishes a bi-level optimization model for integrated energy systems that handles the interaction between centralized energy generation and the heating costs of end...

To better accommodate the uncertainty introduced by renewables and loads, a hybrid timescale dispatch hierarchy for the combined heat and power system is constructed in this paper, which coordinates the stages of day-ahead dispatch, intraday rolling dispatch, real-time dispatch, and automatic generation control to decompose the uncertainty step by...

The proliferation of technologies such as combined heat and power systems and smart meters has accelerated the multi-energy trading. A two-stage game model is built in this paper to analyze the optimal strategy of each player and their interactions. Specifically, in consumer game model, we present an autonomous and distributed micro energy manageme...

The integrated energy system (IES) can improve energy efficiency and promote renewable energy consump-tion, and has become key research focus in the field of energy. How to realize multi energy cooperative planning and joint operation is the main problem of IES operation. In the cogeneration combined energy system, the electric energy can be real-t...

This paper proposes a dispatch strategy for the multi-energy system (MES) that utilizes the district heating network (DHN) to realize the heat power interaction of multi cogeneration system, so as to improve the operational flexibility. A novel model for the DHN that couples multi heat sources and is under quantity regulation is proposed, based on...

Integrated energy system (IES) is an important developing direction for future energy use. It is vital for further improving the economic and environmental benefit to realize collaborative planning and dispatching of multi-district IES, where the first problem is the modeling of district heating and cooling network (DHCN). In this paper, a general...

The integrated energy system able to realize optimal utilization of all kinds of energy and effectively solve the problem of environment pollution and energy waste has good development prospects. The planning of a multi-district integrated energy system based on the synthesis of combined cooling, heating and power (CCHP) and heating network is main...

GNSS signal can generate Doppler shift in high dynamic flight． The common tracking loop can not track the signal steadily and possibly lose to lock signal． A method by providing assisted Doppler shift for the tracking loop with inertia information is proposed in this paper so as to realize stably tracking the signal of GNSS in high dynamic environm...