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An energy-saving control strategy for central air-conditioning system based on predictive control is proposed in this paper. The cold load model is developed to describe the dynamic characteristics of temperature control system, and then parameters in the cold load model and in the central air-conditioning system model are estimated. The generalized predictive control (GPC) is used to establish the...
Along with the growing energy consumption of modern society, the environmental protection of power system becomes more important. In this paper, the environmental impacts on thermal power plants are considered in optimal power flow, and a new method to determine the weight of objective function is proposed. Thermal power plant's geographical location, weather conditions and the impact of population...
In order to effectively evaluate the capability of large-scale blackout emergency handling, and find out the weak links for power grid enterprises in regard to large-scale blackout emergency handling, the evaluation indices system for the emergency handling to large-scale blackout is systematically proposed and established by this paper. The indices system is built upon the characteristics of large-scale...
In this paper, the characteristics and harm of the impact that natural disasters could make on power system were analyzed. Furthermore, the natural disaster early warning system for power system is proposed, and details of the four parts of the system are introduced respectively. The authors focused on the information sources of early warning monitor, the three steps of risk assessment, the determination...
Power system installed with SSSC is a large-scale nonlinear, indeterminist, multivariable system, and the traditional PI controller has a limited application in some cases because of its non-adaptive parameters. This paper presents the design of a neuron-controller for a SSSC that augments the conventional PI controller. The neuron controller uses adaptive critic design (ACD) with emphasis on dual...
The optimization algorithm of allocation problem of mobile emergency generator (MEG) under a certain budget is analyzed in this paper. The classification of loads is discussed firstly, and then the index to describe the severity of the loss of a certain load is obtained. Three hierarchical problems are proposed. By solving one integer programming problem and a dynamic programming problem, three problems...
This paper design an integrative ancillary fuzzy logic controller for the Voltage Source Converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/ DC system by damping the oscillation effectively after disturbance. The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. No detailed model of the system is required for the design...
This paper presents the power energy effect under unbalance condition and discusses the relation between power loss and unbalance degree. Then a new topology structure of SVC based on the principle of unbalance compensation is proposed to solve the unbalance problem in power system and the energy efficiency is analyzed by an actual experiment with the compensation of the new SVC. The experimental...
This paper builds the dynamic mathematic model of the three-level Neutral Point Diode Clamped (NPC) converter, discusses the fundamental principles of the active and reactive power control for three-level Voltage Source Converter based HVDC (VSC-HVDC) system. To fully utilize the controllability of VSC-HVDC, multi-target controller is developed to control AC and DC system respectively. Improved sine...
When a pumped storage plant is used for black-start in system restoration, some capacity in the upper reservoir must be reserved. However, this capacity cannot be used for load-balancing in daily operation. Obviously, the economy of pumped storage plant would be influenced. So it is significant to make reasonable evaluation of black-start capacity of the upper reservoir. In order to address this problem,...
The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. An auxiliary fuzzy logic controller designed in Matlab for the voltage source converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/DC system is designed to enhance stability by increasing the deceleration energy of oscillation. Simulation results on the IEEE 4-generator...
This paper puts forward an auxiliary fuzzy logic controller for the Voltage Source Converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/DC system by damping the oscillation effectively after disturbance. The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. No detailed model of the system is required for the design of...
The necessity of super grid operation at different layer and zone together with relevant technical principles are discussed in this paper. The proposed methodology deals with two questions: whether electromagnetic loops should exist or not in power system and how to put in practice. Corresponding indices are established to assess the system performance. An example is demonstrated and a software program,...
The process of determining whether a power system is secure or insecure is specially important under power market conditions. Voltage security is an indispensable aspect of power system security. In recent years, more and more researchers have focused theirs eye on dynamic aspect of voltage stability. In order to overcome the time-consuming deficiency of time domain simulation, this paper develops...
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