Intermittency Of Renewables?… Not So Much

[kristopher]

13. Only you talk of an all wind/all solar/or all solar wind grid.

No one else. It is one of your favorite and most transparent red herrings. You trot them out so fast and so often it is truly remarkable. For example, you say that the smart grid doesn't offer anything that can't be done presently. No, it doesn't. But what it does is use technologies we have to upgrade the abilities of the grid to manage distributed generation. The type of duplicity these two examples offer constitutes one of your core strategies for misleading people.

Single-phase inverter design for V2G reactive power compensationVehicle to grid (V2G) power transfer has been under research for more than a decade because of the large energy reserve of an electric vehicle battery and the potential of thousands of these connected to the grid. In this study a complete analysis of the front end inverter of a non-isolated bidirectional EV/PHEV charger capable of V2G reactive power compensation is presented.

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5744688&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D5744688

Seminar: Vehicle to Grid (V2G) Reactive Power Support Using Plug-in Electric Vehicles (PEVs) Speaker: Dr. Mithat Can Kisacikoglu, University of Tennessee, USA. Place: Hacettepe University, Department of Electrical & Electronics Engineering, Seminar Hall Time: Friday, May 31st 2013, 13:30
Abstract
More battery powered electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) will be introduced to the market in 2013 and beyond. Since these vehicles have large batteries that need to be charged from an external power source or directly from the grid, their charging circuits and grid interconnection issues are garnering more attention.

It is possible to incorporate more than one operation mode in a charger by allowing the power to flow bidirectionally. Usually, the bidirectional power transfer stands for two-way transfer of active power between the charger and the grid. The general term of sending active power from the vehicle to the grid is called vehicle-to-grid (V2G).

While plug-in electric vehicles (PEVs) potentially have the capability to fulfill the energy storage needs of the electric grid, the degradation on the battery during this operation makes it less preferable by the auto manufacturers and consumers. On the other hand, the on-board chargers can also supply energy storage system applications such as reactive power compensation, voltage regulation, and power factor correction without the need of engaging the battery with the grid and thereby preserving its lifetime.

This study shows the effect of reactive power operation on the design and operation of single-phase on-board chargers that are suitable for reactive power support. It further introduces a classification of single-phase ac-dc converters that can be used in on-board PEV chargers based on their power transfer capabilities in addition to the currently available surveys.

A 3.3 kVA on-board bidirectional charger is designed to experimentally demonstrate reactive power operation of the charger. A single-phase ac-dc active front-end boost rectifier and a half-bridge bidirectional dc-dc converter are utilized for the charger design. Also, a new controller for active and reactive power command following for EV/PHEV bidirectional charger is designed and experimentally demonstrated.

Finally, the cost of supplying reactive power is also important to effectively evaluate reactive power operation using chargers. There are two major impacts: one is on the converter design (incremental costs) and the other is on the operating electricity costs. Their combination shows the total effect and cost of reactive power operation and can be compared with other options of the utility grid to supply reactive power. Two customer scenarios are investigated to have two options of reactive power support. Level 1 and Level 2 reactive power support are evaluated separately.

http://www.ee.hacettepe.edu.tr/documents/Kiskacoglu_Seminar_31052013.pdf

Poor Dr.Greg/Pam. All hat, no cattle.