Application of DVC multi-function power analyzer in photovoltaic energy storage test
Application scenario:
Type of experiment:
Charge and discharge test
On grid/off grid switching test
Efficiency test
Overload capacity test
Power quality test
Power control test
Grid adaptability test
Low voltage ride through test
High voltage ride through test
Anti islanding protection performance test
Protection function test
Communication test
The figure below shows the schematic diagram of PV energy storage with a common PV bus. We take this as an example to introduce Dewei Chuang DEWETRON Test solutions, test parameters and advantages of:
Measuring point 1: PV PV module
The DC output Vdc and Idc of PV can be tested according to IEC60904 standard to obtain the current and voltage characteristics of PV modules. Based on the original current and voltage value, the power P and electricity W are calculated. In addition, DEWETRON's multi-function power analyzer can test a variety of analog signals other than voltage and current, so connecting light sensors and using a solar simulator can test the spectral response, equivalent temperature and other characteristics of photovoltaic modules. ➢ Current, voltage, power, electricity ➢ Light intensity ➢ Temperature
Measuring point 2: DC/AC photovoltaic inverter
The inverter is an important core component in the photovoltaic power generation system, which is used to convert the DC power of PV modules into current power for grid connection or AC load driving. Therefore, there are many test contents for the inverter, and the test and calculation parameters are more complex. DEWETRON Of OXYGEN The power analysis software can test multiple groups&multi-phase power systems at the same time, support DC, AC, star connection, delta connection, 2-meter method and other different wiring methods, and obtain the following parameters with 0.04% calculation accuracy:
➢ Original waveform curve (up to 10MHz original waveform)
➢ Effective value of current/voltage RMS
➢ Active power P, reactive power Q, apparent power S
➢ Power factor PF
➢ Harmonic/interharmonic
➢ Electric energy W
➢ Efficiency η
➢ Flicker (Pst, Plt, Dc, Dmax, td)
➢ Positive sequence, negative sequence and zero sequence components
➢ Three phase imbalance
➢ Frequency F
➢ Voltage transient rise/fall time
Supported photovoltaic test types include:
Basic performance test of inverter converter:
DC input voltage range and overvoltage test
Grid voltage response test
Power grid frequency response test
DC component of grid connected current
Grid connected voltage unbalance test
Power factor test
Efficiency test
Power point tracking (MPPT) test
Audio noise test (Note* DVC power analyzer The noise test can be carried out synchronously when testing the power signal)
Bus soft start and surge current test
PV input current limiting test
Restore grid connection protection test
Output overcurrent/anti back discharge/input overload
Protection test
Island protection test
Inverter converter Fault simulation test ：
Bus soft start failure test
Output phase failure protection test
Low voltage ride through test
High voltage ride through test
Inverter converter Reliability test:
Test point 3: energy storage test
For the test of energy storage and battery system, the DEWETRON multi-function analyzer can test the charging and discharging characteristics, charging and discharging quantity, charging and discharging state and other different parameters of the battery. Through the digital IO interface, the on-off status of switch systems such as circuit breakers and relays can be tested, and the test statistics and control parameters of equipment such as EMS can be read and stored through MODBUS/TCP and CAN protocols.
Test parameters of photovoltaic energy storage system:
➢ Voltage/current
➢ Power P
➢ Electric energy W (stored electric energy W+, released electric energy W -)
➢ DC ripple
➢ Charging/discharging duration
➢ Charging/discharging efficiency
ADVANTAGES OF DEVCRO MULTIFUNCTIONAL POWER ANALYZER
⚫ Flexible configuration, supporting multiple test types:
➢ The number of test channels is flexible, which can realize the configuration scheme of single box 4 voltage/4 current to 32 voltage/32 current;
➢ Speed, torque, temperature, noise, vibration and other signals can be synchronously tested and analyzed in the software;
➢ Support USB camera and high-speed camera, which can save and record the whole test process;
➢ Multiple models, suitable for distributed test, field portable experiment and bench integration test;
⚫ Powerful power test board
➢ Direct input of voltage up to 2000V, reading accuracy 0.03%, no measuring range error;
➢ Support various types current sensor Acquisition and power supply;
➢ sampling rate Up to 10MHz/channel, and all channels can use the sampling rate to collect and store at the same time
⚫ Powerful OXYGEN test and analysis software
➢ Windows based software, easy to operate, such as LVRT drop time cursor reading directly;
➢ Online/offline power group calculation, with complete types of calculation parameters for photovoltaic and energy storage tests;
➢ Support continuous storage of raw waveform data up to 10MHz;
➢ Powerful data post-processing, which can perform online and offline operations such as statistics, filtering and formulas based on the original data;
➢ Batch processing/export of test data for data analysis and report generation;
⚫ Support multiple communication modes
➢ Support multiple data interaction modes such as SCPI/DATASTREAM/XCP/UDP/CAN/EtherCAT;
➢ Read EMS data and status through MODbus/TCP protocol;
➢ Support customized development and analysis of serial port data such as RS232/RS485/RS422;
Test interface display:
Figure 1 Flexible display interface (customized)
Figure 2 Multiple power test wiring modes
Figure 3 Multiple waveform data markers for experimental reports
Reference user:
TUV Jiangsu Guochuang Testing Guangzhou Huachuang Testing Balun Testing Wuxi Quality Inspection Institute Huawei Sungrow Power Supply Shangneng Electric TBEA Guruiwat Goodway Jinlang China Electric Power Research Institute Shanghai Electric Power Research Institute New Energy Institute Gansu Electric Power Research Institute Hunan Electric Power Research Institute Qinghai Electric Power Research Institute Shaanxi Electric Power Research Institute Shanxi Electric Power Research Institute
