PV and Wind Power Industry
PA6000 Power Analyzer can provide up to seven power input elements. It can accurately measure the input and output voltage, current, power and other electrical parameters of the new energy inverter. It is also capable of providing accurate tests of efficiency, harmonics, low voltage ride through (LVRT) and other functions.
Simultaneous measurement with 0.02% power measurement accuracy
PA6000 Power Analyzer achieves a breakthrough power measurement accuracy of 0.02% by adopting the latest data collection technology. A single instrument can perform power measurement at multiple points simultaneously, providing strong data support for the efficiency tests of PV inverters and wind converters.
Direct measurement with up to seven 1000V/50A elements
PA6000 Power Analyzer makes use of a 100MHz synchronous clock with high-stability temperature compensation to avoid the measurement error caused by temperature drift, keeping the phase error of each element within 10ns to ensure accurate measurement of active power and power factors.
Low voltage ride through (LVRT) test for PV and wind power industries
ZHIYUAN Electronics has added special test functions in the software for the PV and wind power industries, which not only perfectly solves the LVRT test issues for the PV industry but also exclusively adds the wind power industry with the LVRT test function, helping users in the wind power industry to self-independently conduct LVRT tests on the wind power converters.
The LVRT test for the PV industry goes through the process as follows:
According to the requirements of GB/T 19964-2012, LVRT tests of the PV industry must meet the following requirements:
When the voltage at the grid connection point drops to 0 but can be recovered up to 20% of the rated voltage within 150ms, the inverter has to ensure that it will not go off-grid within this 150ms.
（2） If the voltage can be recovered to 20% of the rated voltage within 0.625s after the voltage at the grid connection point has dropped, the inverter has to ensure a continuous operation for 625ms without going off-grid.
（3） If the voltage can be recovered to 90% of the rated voltage within 2s after the voltage at the grid connection point has dropped, the inverter has to ensure continuous operation without going off-grid.
The LVRT test for the wind power industry goes through the process as follows:
According to the requirements of GB/T 19963-2011, LVRT test of the wind power converter must meet the following requirements:
（1） The wind power generating unit can guarantee a continuous operation of 625ms without getting off-grid when the output voltage of the wind power generating unit has dropped to 20% of the rated voltage.
（2） The wind power generating unit can guarantee continuous operation without getting off-grid if it is able to recover to 90％ of the rated voltage within 2s after the output voltage of the wind power generating unit has dropped.
The wind power industry has a latest LVRT test standard: On the premise of IEC61400-4-7 harmonics algorithm, the following three datas also need to calculate:
The total harmonic current distortion of all harmonic components from the 1st order to 50th and numeric data for each harmonic.
The inter-harmonics current component of each interval below 2 kHz
The current inter-harmonics component of 2kHz-9kHz (Harmonics up to 180th order)
PAM Management Software LVRT Data Analysis
(supporting the latest standards of the wind power LVRT):
Supporting both the IEC61000-4-7 harmonics testing standard and the German VDE-AR-N4105 harmonics testing standard
IEC61000-4-7 harmonics testing standard
As the technical standard governing the harmonics and inter-harmonics measurement methods and instruments in power system and grid-connected equipment, IEC61000-4-7 is the only standards among all the international power quality measurement standards that can accurately measure the electrical harmonics of power networks. It can analyze and test whether the harmonic content of the measured object is too much or not compared with the harmonic limits stated in the standard.
The spectral analysis of the IEC harmonics measurement standard prescribes the interval to be 5Hz, and that the harmonics amplitude is determined by the root mean square of the harmonic subgroups. It not only poses much stricter requirements on the harmonics content than the old standards of general harmonic test, but also conforms more in line with the distribution of harmonics contents in the power grid of reality. A combination with the IEC61000-4-7 analysis on the standard limits for harmonics contents will generate a more authoritative harmonics analysis.
German VDE-AR-N4105 harmonics testing standards
VDE-AR-N4105 is the administrative provisions, newly issued by Germany, on the grid-connecting operation of the low-voltage power supply. The difficult part in these provisions lies in that the measuring equipment must provide the results of as many as 178 times of harmonics measurement for the harmonics analysis. Since the low-voltage grid-connecting standard VED-AR-N4105 requires the harmonics measurement range to cover the entire low-frequency domain (approximately within 9KHz), the number of tests is 8900/50=178 (50Hz being the first harmonic) .
PA6000 series power analyzer supports both IEC and DIN N4105 (German standard) harmonics testing standard. It can support a maximum of 256th harmonic measurements (PA8000 and PA5000 can achieve 500 measurements), being able to truly represent each harmonic component and the total harmonic distortion (THD).
60G data storage and excellent data format analysis
PA6000 power analyzer is equipped with a solid state disk (SSD) of 60G, capable to perform massive data storage. It can even allow users to connect the USB flash drive directly so as to store all the data needed. Given the capability to support a variety of formats, such as PAD and CSV, and to control the storage time at will, storage is no longer an issue.
On-site acceptance for PV and wind power
Many solar PV power stations and wind power stations are set up in remote mountainous areas or installed on roofs with harsh conditions wherein even the power supply would become an issue. This brings out the need of power analyzers not just with high testing accuracy but also being easy to carry. The power analyzers of the PAmini series are small in size, with battery, and capable of continuous operation for 3-4h, making them ideal for the site acceptance in the environment of the PV and wind power stations.
In the PV and wind power industries, users are mostly concerned about the accuracy of power measurement and efficiency measurement. PA6000 power analyzer has a accuracy of 0.02% for power measurement and 60G for data storage capability, together with the functions of the low-voltage ride-through test and maximum power point tracking (MPPT) measurement attached in the software to meet the requirements of all tests in the PV and wind power industries.
Another Recommended Model: PA3000