Optimal placement of parking lots with optimal scheduling in power systems to maximize the benefit, considering different peak load states and different electricity prices for each state, is studied in this paper. The effectiveness of the proposed technique is tested on the IEEE 33-bus distribution test system with considering the power system constraints and using genetic algorithm. This algorithm selects the optimal sites and sizes (number of electric vehicles) of these parking lots and shows the optimal results. The results of these simulations with genetic algorithm demonstrate that the economic problem of parking lots placement depends on many items such as number of the electrical vehicles (EVs) in each parking lot (capacity of parking lot), state of charge of EVs, as well as the electricity price in peak/off-peak periods. Moreover, it is suggested that the existence of parking lots, considering adequate incentives for EVs owners, has economic benefit for distribution network operators, reduces total power loss, and can improve the distribution system voltage profile. Also, the number of parking lots to be allocated in a distribution system supports the distribution system at peak load hours because it is more interesting from economic point of view to install more parking lots.

A shunt hybrid active DC filter (HADF) is applied to eliminate DC transmission line current harmonics in HVDC transmission system. Since the harmonics increase transmission line losses and disturb control and monitoring equipments so HADF are used to suppress harmonics on DC transmission lines. In this paper a modified method is presented to control the shunt HADF which is not dependent on HVDC circuit parameters. HADF by injecting the compensating current to DC transmission line with the modified method suppresses the DC transmission line current harmonics significantly. Six major problems in design of modified control method have been discussed thoroughly. The principle of operation is described and the theoretical analyses are indicated to verify the control strategy. HVDC system is simulated by PSCAD/ EMTDC software. Simulation results and comparisons prove and validate the accuracy of these claims.

The voltage source inverter (VSI) and Current source inverter (CSI) are two types of traditional power inverter topologies.In this paper selective harmonic elimination (SHE) Algorithm was impelemented to CSI and results has been investigated. Cat swarm (CSO) optimization is a new meta-heuristic algorithm which has been used in order to tuning switching parameters in optimized value.Objective fuction is reduction of total harmonic distortion(THD) in inverters output currents.All of simulation has been carried out in Matlab/Software.

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