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Distribution grid simulation is important method to related department for the distribution grid planning, design, testing, operation and experiment. It is common method of the distribution grid protection, measurement and control equipment function test and distribution grid automation system function test. Distribution grid simulation can be divided into real-time simulation and non-real time simulation...
The inductively coupled coil in wireless power transfer (WPT) system is the key to optimizing the power transfer efficiency. Based on an iterative printed spiral coil (PSC) design procedure, this paper proposes a load-based design method to improve the efficiency stability for a load-variable system. The efficiency stability coefficient is defined to choose the optimal PSCs. Several pairs of PSCs...
This paper focuses on the modeling and control of a Free Piston Engine Generator (FPEG) which is an alternative to conventional internal combustion engines to be used as an auxiliary power unit (APU) in hybrid electric vehicles (HEV). A physics-based, continuous-time model and a discrete-time, control-oriented model are derived. A model predictive control approach is proposed to manage system constraints...
Idle speed control is considered as one of the most important issues in engine control. In this paper, we develop a triple-step nonlinear method to solve the idle speed control problem based on a data-physics mixed engine model. Concerning about the implementation issue, the map-related derivative items in the controller deduction are elaborately pretreated in the modeling step. Then, the controller...
In this paper, the three active components in Scutellaria Extract were rapidly determinate by near-infrared reflectance spectroscopy (NIRS). 100 samples of Scutellaria Extract from 12 different pharmaceutical factories were divided into a calibration set (80 samples) and a validation set (20 samples). In combination with the partical least square (PLS), the quantitative calibration models were established,...
The subthreshold circuit is a promising ultra-low-power solution for such applications that don't require high speed but are extremely power-stringent. The characteristic of the current under subthreshold voltage is different from the normal domain. A delay model is essential to predict the performance, analyze the variation impacts and optimize the design. This paper proposes a fast computable delay...
This paper discusses a novel approach for analysis of large scale real time grid operation performance. The PJM Interconnection energy market is one of the largest centralized markets in the world. Recently PJM deployed a newly developed application called “Perfect Dispatch” designed to provide a baseline measure of grid operational performance using retroactive real time market simulation and analysis...
The tooth contact and load distribution of involute helical gears are investigated by means of finite element analysis (FEA) instead of traditional mechanical method. First, based on UG, the model created accurately is leading into Patran & Nastran. Secondly, the face-contact model of gears is established according to the deformation compatibility condition and force equilibrium relationship....
Summary form only given. Electricity markets have been moving on from infancy toward maturity. Experiences have shown that competitive market operation needs to integrate with secure and reliable system operation; otherwise, market failure and/or blackout may happen. This panel will review PJM's practice on how to achieve equilibrium between economic efficiency and system operation risk. In PJM's...
Electricity markets are designed and operated based on physical constraints of modern power systems. This panel will review the practices on post-contingency congestion mitigation with market forces, from the perspectives of market design and market operation. Future challenges will be also discussed.
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