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The strengths of both push and pull using both hands at handle heights of 75, 90, and 135 cm were measured for 11 female and 8 male participants. In addition, simulated push and pull tasks were performed on one of the three heights as in the strength measurements. In these tasks, the participants either pushed or pulled a swing suspended with one of the two loads (32.5 and 42.5 kg) until they could...
Because photovoltaic (PV) power generation has characteristics of volatility and randomness, with large-scale PV power generation connected to the grid, it will effect the safe and stable operation of power gird. It is necessary to establish an accurate grid-connected PV inverter model to carry out a reliable load flow analysis calculations. Under the steady-state, grid-connected PV inverter control...
Low voltage ride through (LVRT) ability is the most important indicators of photovoltaic (PV) power generation unit grid-connected performance. At present, most of the important standards in the world require that PV power unit must have LVRT ability, and part of the standards demand that PV power generation unit should have reactive power support capacity as well, in order to maintain grid voltage...
PV power plants should meet technical requirements before connected to grid. Due to the equipment capacity and cost constraints, low voltage ride through (LVRT) of the plants can not be directly tested. In this paper, the methods to assess PV plants performance based on the field test of power generation unit (PGU) are introduced. At first, the way to test LVRT capability of PGU is put forwarded,...
Reactive power control is one of important grid-connected performance index of the photovoltaic (PV) power station. PV power station must provide corresponding reactive power under different grid disturbance condition, in order to meet grid code. The dynamic reactive power compensation devices and grid-connected PV inverters both provide reactive power for PV power station, but with different performances...
In this paper, the power quality of PV system is analyzed which contains test conditions, test method and test results according to the technical rule of power quality in Q/GDW617-2011 ‘Technical rule for photovoltaic power station connected to Power Grid’ and the test procedures of power quality in Q/GDW618-2011 ‘Test procedures for photovoltaic power station connected to power grid’. Compare with...
State grid corporation of China(SGCC) has issued “Technical rule for PV power station connected to grid (trial)” in July 2009, while claimed that grid-connected testing would be accepted and adopted if the PV power station connecting to the grid. According to the technical rule for PV power station connected to grid, a type of movable field testing platform for low voltage distribution grid-connected...
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