with"Double carbon"With the implementation of the policy, the new energy industry is rising rapidly and attracting much attention. While the state vigorously supports the photovoltaic industry, the inverter industry has also ushered in new opportunities and challenges. Due to the dual crisis of the increasingly tense energy situation and the increasing demand for electricity, the public power grid has put forward higher requirements for the quality and performance of grid-connected inverters.
However, there are some inverters on the market that do not meet the performance standards and are difficult to pass even in conventional electrical characteristic tests, such as over- and under-voltage protection, anti-islanding, high-low voltage ride-through, harmonic distortion, maximum power point tracking (MPPT), etc. In order to meet this challenge, it is necessary to develop a series of rigorous and comprehensive test plans for grid-tied inverters to ensure that their quality and performance meet the relevant standards and can operate safely and stably for a long time. This will not only help meet energy demand, but also drive the inverter industry to greater growth.
Photovoltaic power generation system:
Photovoltaic grid-connected power generation system is a new energy power generation system, its working principle is to first use the photovoltaic effect of photovoltaic semiconductor materials to convert solar energy into direct current, then through AC and DC conversion to direct current into alternating current, and finally through the power grid to transmit the generated alternating current to the user end. The general photovoltaic power generation system is divided into two types: centralized system and distributed system. The centralized system mainly refers to the large-scale photovoltaic power station built in the desert area, which can collect a large amount of solar energy stably, and then provide energy for the grid load through high-voltage long-distance power supplyDistributed mainly refers to photovoltaic power generation projects built on the roofs of urban buildings, which solve the electricity problems of users nearby, and realize the compensation and delivery of power supply differences through grid connection. Although the way of power transmission is different, both are grid-connected photovoltaic power generation systems.
What is an inverter:
The inverter is an electrical device that can change the voltage, frequency, phase and other amounts or characteristics of the power supply system, and its main function is to convert direct current energy into alternating current energy, which is composed of an inverter bridge, control logic and filter circuit, and the core part is a PWM integrated controller. The application field of inverter is very wide, such as new energy vehicles, photovoltaic power generation systems, wind power generation systems, televisions, computers and other electrical equipment. The inverters used in the field of photovoltaic power generation can be roughly divided into two types: on-grid inverters and off-grid inverters.
The input terminal of the grid-connected inverter is connected with the parallel photovoltaic module, and the input DC power is converted into AC power through the IGBT power module or field-effect transistor, and the quality of the output AC power is improved by using the DSP conversion controller to make it close to the sine wave current.
The biggest feature of the grid-connected inverter is that the power system has high power and low cost, and the electric energy can be accurately controlled, without the need to store the electric energy, and the DC electric energy generated by the photovoltaic is directly transmitted to the public power grid after conversion, so as to ensure that the AC electric energy is completely synchronized with the public power grid, so as to fully meet the frequency and phase characteristics required for the current electric energy.
Solution:
Suta Electric has been committed to researching the photovoltaic industry and providing professional testing solutions for grid-connected inverters. At present, Suita has launched a new generation of test instruments for grid-connected inverters in the field of photovoltaic power generation, such as SPSD series bidirectional programmable DC power supply, SPSA4015R feedback AC grid analog power supply, SPA7000 power analysis recorder and other products, with ultra-high power accuracy, aiming to meet user needs. In Suta's test solution, the SPSD series bidirectional programmable DC power supply is connected to the input of the grid-tied inverter to simulate the input of solar cellsAt the same time, the SPSA4015R feedback AC grid analog power supply is connected to the output of the off-grid inverter to simulate the AC electronic load.
The SPAw7000 power analysis recorder measures the harmonics, output power, conversion efficiency and other performance indicators of the inverter. In order to further improve the convenience and visual analysis of the testing process, Suitea also provides powerful host computer software to provide engineers with comprehensive data analysis support. This series of efficient and advanced products and solutions marks Suta's leading position in the industry and provides strong support for the development of the photovoltaic industry.
Advantages of Suita Electric
Ultra-high accuracy: The SPAw7000 - Power Analysis Recorder has up to 001% measurement accuracy and 0The high bandwidth of 1 Hz-5 MHz can accurately measure the input and output voltage, current, power and other key parameters of the energy storage converter.
High-speed computing: SPAW7000-power analysis recorder has current phase compensation function, integration function, fast Fourier transform function, etc., and the data update rate can reach up to 10ms, which can carry out high-speed calculation on the basis of ensuring high precision.
Large-capacity data storage and analysis: It can store voltage, current, power and other measurement data as well as voltage and current display waveform data in real time, with a maximum storage rate of 100 seconds, and a built-in 512GB large-capacity storage space (optional 1TB), so that its comprehensive performance can be evaluated, so as to better optimize and adjust the system.
Support harmonic analysis: The SPAw7000-Power Analysis Recorder can perform up to 500th harmonic measurements, and can analyze harmonics of 7 power channels at the same time, in accordance with IEC61000-4-7 standard. In addition, voltage fluctuations and flicker can be measured and analyzed according to IEC standards.
High performance: The power supply products can reach up to 15kW and voltage up to 1500V, and can further expand the measurement range through multiple power supplies in series and parallel, which fully meets the test needs of grid-connected inverters.
Safe and reliable: In addition to the power supply function, the power supply product also has the function of electronic load, and provides a variety of protection functions, such as OVP, OCP, OPP, OTP, power-down and input under-voltage protection, so that the test process is more safe and reliable.
Multi-functional developer mode: built-in function generator, complete programming function and minimum controllable programming time as low as 10ms, support arbitrary waveform generation, such as standard solar cell IV curve waveform simulation.
Application Scenarios:
Over- and under-voltage protection test.
High and low voltage ride-through testing.
Anti-islanding test.
Harmonic distortion test.
Waveform distortion test.
MPPT test.
Conversion efficiency measurements.
Power factor measurements.
Over- and under-frequency protection.