Test of high power bidirectional DC-DC in new energy system

Test of high power bidirectional DC-DC in new energy system

[Introduction]Under the background of “carbon peaking in 2030 and carbon neutrality in 2060”, the new energy industry represented by photovoltaics, electric vehicles and energy storage is really hot! Various manufacturers are also going all out to conquer cities and loot the land, constantly expand their territory, and use the technological combination of various “new forces” to pursue greater power and lead the innovation of energy and power grids. For example, a well-known domestic manufacturer signed the world’s largest energy storage project in Saudi Arabia in the fall of 2021, and cooperated with new energy power generation systems such as photovoltaics or wind power to store electricity when there is excess electricity, and release it when it is insufficient. Reduce the abandonment rate of non-all-weather photovoltaic or wind power, improve power generation efficiency and reduce power generation costs while improving grid stability.

Under the traditional power grid, electricity is sourced from various power stations, and then transmitted from the grid to the user, which is a typical one-way transmission. In the era of new energy, in addition to traditional centralized power generation, residents or factories can generate electricity through rooftop photovoltaics. In addition to their own use, they can also be stored or exported to the grid. Even electric vehicles can be distributed energy storage and suppliers.

Test of high power bidirectional DC-DC in new energy system

Transformation diagram of traditional power grid driven by new energy

In the new embodiment architecture, there is a power conversion component in the C position, which is the bidirectional DC-DC, which interconnects the power between the energy storage system and the power generation and power consumption systems. Compared with the traditional one-way DC-DC, the two-way DC-DC can significantly reduce the system cost, simplify the system and reduce the failure rate while ensuring the conversion efficiency.

Test of high power bidirectional DC-DC in new energy system

As shown in the figure below, a typical new bidirectional DC-DC conversion power supply structure, the power can flow from left to right or right to left, and the identification is also changed from the previous Input and Output to BUS and HV.

Test of high power bidirectional DC-DC in new energy system

In traditional unidirectional DC-DC, electrical energy flows from the input terminal (Input) to the output terminal (Output). Therefore, in the performance test, the power supply and the Electronic load are used to absorb power, and the oscilloscope, voltmeter, power meter, etc. are used to measure. But this method, when testing bidirectional DC-DC, will be difficult. This is not only the need to replace the wiring during the test process, the test process is complicated and cumbersome; more importantly, it is impossible to fully evaluate the product characteristics, especially in the process of input-output conversion.

Test of high power bidirectional DC-DC in new energy system

Leveraging Keysight’s APS Advanced Power System enables more efficient, reliable, and comprehensive testing and validation.

● Two-way seamless power and load switching function to build the same test environment as the usage scenario.

● 0.03% Voltage measurement and 0.02% current measurement accuracy, accurately characterize the conversion efficiency.

● Microsecond-level voltage and current slope, high-speed simulation of transient characteristics of power and load.

● Built-in 18bit oscilloscope, 64KSa arbitrary waveform and other functions, accurately measure and analyze dynamic characteristics.

● Drag-and-drop Test Flow program editing to comprehensively improve the test efficiency during R&D.

Test of high power bidirectional DC-DC in new energy system

HV <-> BUS bidirectional measurement without changing test connections

Test of high power bidirectional DC-DC in new energy system

Test Flow drag-and-drop automatic test platform, quickly verify the two-way “Eff efficiency Vs Power power” curve

The APS advanced power supply system has a single power of up to 30KW and a voltage of 2000V, and supports 20 parallel machines up to 600KW. At the same time, with excellent hardware performance and powerful software platforms such as photovoltaic simulator and battery simulation, various functions such as photovoltaic Inverter MPPT efficiency test, battery model extraction test, and battery simulation can be realized, which can improve the utilization rate of measurement equipment and save energy. Expensive investment in test instruments helps you improve the performance of products such as photovoltaic inverters and energy storage systems.

Test of high power bidirectional DC-DC in new energy system

The Links:   CXA-L0612-VML NL12880BC20-07F TIMMALCD

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