Bin Liu

Bio: Bin Liu is an academic researcher from Electric Power Research Institute. The author has contributed to research in topics: Transformer & Electric power system. The author has an hindex of 13, co-authored 154 publications receiving 614 citations. Previous affiliations of Bin Liu include Tsinghua University & University of New South Wales.

Thermal Inertial Aggregation Model for Integrated Energy Systems

Abstract: 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 thermal dynamic characteristics (i.e., thermal inertia) of the district heating network (DHN) and buildings to facilitate the analysis, planning, and operation of IESs. Firstly, an equivalent start network is introduced for modeling the radial DHN, and a synchronous response model is proposed for buildings to approximate the optimal response of heat load. Secondly, the thermal inertia aggregation model (TIAM) is proposed, which offers an accurate DHN and buildings model for the planning and operation of IESs. Finally, some properties of the TIAM are derived to reveal its potential in general applications such as analysis and evaluation. Simulation results of different scale systems demonstrate the performance of the proposed model and reveal its advantages in the computational efficiency and sensitive information protection of DHN.

Optimal Dispatch of Coupled Electricity and Heat System With Independent Thermal Energy Storage

Abstract: Notable benefit can be brought by combined operation of a coupled electricity and heat system (CEHS), and be enhanced by introducing thermal energy storage (TES). Existing literature researching on this topic either neglects the heat network, or requires TES system being located and operated together with a combined heat and power unit. This paper aims at removing such requirement whilst taking heat network into account. With prevalent constant-flow variable temperature control strategy of heat network, the optimal dispatch model of CEHS considering independent TES (ITES) system with networked electric and heat energy distribution systems is presented. The non-convex parts in the heat network, mainly caused by the MFR reversal when ITES changes its operation state, are exactly reformulated to mixed-integer linear (MIL) constraints, which leads to a mixed-integer second-order programming formulation of the problem. Case studies demonstrate that introducing ITES not only brings reduction in the total operation cost, but also ameliorates the system reliability and its capability in accommodating renewables.

Galloping suppression of a suspended cable with wind loading by a nonlinear energy sink

Abstract: In this paper, an adaptive and passive galloping suppression of a suspended linear cable is investigated. The limit cycle oscillation (LCO) of cable due to nonlinear wind loading is effectively eliminated by a lightweight, easy-to-make attachment: nonlinear energy sink (NES). Analytical mechanism of LCO is explored by using harmonic balance method, implying that NES is valid for LCO suppression under any wind speed. Finally, the influences of mass ratio, damping, stiffness and location of NES on vibration suppression are highlighted in detail.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …