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Solar energy can be effectively utilized as the grid-connected photovoltaic (PV) generation system. But in weak grid, the non-ignorable network equivalent impedance is a great challenge for the stability of grid-connected voltage source inverters (VSIs). This paper focuses on the single-stage three-phase grid-connected PV inverter, presents a small signal model of PV inverter, and gives a physical...
High Side Voltage Control (HSVC) is a well-known method used in modern power systems. Proper HSVC droop setting can improve the voltage profiles and balance the reactive power distribution among generators. In this paper, an optimal HSVC droop planning strategy is proposed to improve voltage profile. We use monthly historical instrumentation data from SCADA to plan for the coming year monthly HSVC...
Offshore wind energy is expected to be the substitute of the fossil energies as its renewable and clean characteristics. The integration of large-scale offshore wind power is the new challenge for power system plan and operation. As the new characteristics, the connection technology for large offshore wind energy is the newly research area. This paper will focuses on the available methods of integration...
For a specific frequency control system including AGC, there were relative differences in system frequency response due to the power disturbances in different frequency. The sensitive disturbances were defined in this paper by considering the natural characteristics of frequency control system including AGC. Establishing the frequency control system model, then analyzing its transfer function is an...
For large-scale wind power access to the grid based on thermal power peaking, the structure of power and peaking capability restrict the accessing of large-scale wind power. Large-scale energy storage system can achieve load space-time translation and improve security and economy of power grid operation. In this paper, considering factors of storage cost, wind power investment cost and wind power...
A fuzzy decoupling technique is proposed for model validation of large-scale power systems. To solve the problem of incredibility lying in power system dynamic simulations, a wide area pattern (WAP) is defined which reflects the parameter effects of certain component to the space-time trajectories, especially with consideration of the characteristics of huge amount of measurements and model parameters...
Model validation is a basic and important work to ensure the dynamic simulation accuracy which influences the decision of power system design, planning, operation and control. Because large scale power systems have a great many components, the model validation work is very complex. A measurement-based model validation software(PSMV) is introduced in the paper. Current simulation accuracy can be evaluated...
Although wind energy is one of the sustainable, environmentally friendly renewable energy sources, the large-scale wind power fluctuations maybe exert adverse impact on the system operation economics of the power system due to the intermittency of wind power. In this paper, a net benefit evaluation model of wind power considering operational regulation cost of thermal plants for balancing power variation...
A photosynthetic yield model at leaf level was constructed with the response of photosynthesis of mangroves to environmental factors as a main clue. Using five mangrove species, Bruguiera gymnorriza, Avicennia marina, Aegiceras corniculata, Kandelia candel and Excoecaria agallocha as the test materials, the characteristics and rationality of the response of photosynthesis to environmental factors,...
To minimize the ripples of the electromagnetic torque and flux linkage, fix the variable switching frequency, produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motor (PMSM), a space vector modulation (SVM) DTC strategy was introduced based on PI predictive controller. This strategy and the conventional DTC were simulated by the Matlab/Simulink toolbox,...
Trajectory analysis method is an effective approach for evaluating the power system transient stability by proposed stability/instability indices based on the individual machine trajectory. The sensitivity of stability index with respect to some key parameters will be useful for control strategy making in power system operation. A trajectory sensitivity based algorithm for calculating the sensitivity...
To minimize the ripples of the torque and flux linkage and to fix the variable switching frequency produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motors (PMSM), the fuzzy controller was introduced into the PMSM DTC, and a PMSM Fuzzy DTC system based on DSP TMS320LF2407 was implemented. Experimental results show that the proposed Fuzzy DTC system has...
Trajectory sensitivities provide a way to quantify the variation of trajectory resulting from (small) disturbances of parameters and/or initial condition. The trajectory sensitivity analysis has been applied in parameter identification, dynamic performance analysis of power system, and so on. The calculation of trajectory sensitivity is commonly based on the definition of itself. It relies on the...
Allowing a significant reduction of capacitor volumes as well as scalable in terms of voltage levels and control flexibility, stacked flying capacitor inverter has gained great industrial attention recently. However, it also needs to ensure balancing flying capacitor voltages under all operation conditions. A novel PWM method is proposed for stacked flying capacitor multilevel inverter to control...
Allowing a significant reduction of capacitor volumes as well as scalable in terms of voltage levels and control flexibility, stacked flying capacitor inverter has gained great industrial attention recently. However, it also needs to ensure balancing flying capacitor voltages under all operation conditions. A novel PWM method is proposed for stacked flying capacitor multilevel inverter to control...
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