High voltage power conversion system (HVPCS) is typically connected to the AC power grid in a transformerless mode. It consists of multiple small-power, small-capacity energy storage units to form a high-power, large-capacity energy storage system. This system has been widely used in renewable energy integration, grid-side applications, and large-scale industrial and commercial sectors. In order to ensure the healthy and grid-friendly operation of the energy storage system, during the industrial "research and development - production - test" phase, research and development test engineers need to repeatedly modify the controller parameters and test conditions to conduct a series of energy storage inverter tests under various operating conditions. Based on the characteristics of being able to build arbitrary topology models and highly accurate simulations, the use of Hardware-in-the-Loop (HIL) semi-physical hardware for energy storage system grid-connected testing has gradually become a mainstream trend.
By using the semi-physical simulation platform provided by ModelingTech, which features high accuracy, ease of use, and comprehensive data post-processing capabilities, we are able to conduct experiments that traditional testing methods cannot complete or have low efficiency, such as High/low voltage ride through testing, grid-connected testing, and software functionality verification. Compared to traditional testing methods, the introduction of Hardware-in-the-Loop (HIL) platform of ModelingTech has increased our testing efficiency by approximately 10 times. For experiments that require repeated testing to obtain data, the semi-physical simulation platform provides rapid and abundant test data support.
In the future, we hope to introduce automated testing capabilities of ModelingTech to further improve testing efficiency. Additionally, it is worth mentioning the excellent technical support service provided by ModelingTech. Their after-sales response is particularly timely, and they assist us in resolving various issues encountered during the application of the HIL platform in the field of power electronics.
The high voltage power conversion system is typically designed for 6kV/10kV power grid voltage and each phase cascade module is less than or equal to 12 levels. Using the MT 8020 simulation platform of ModelingTech with a general LC solver, it is possible to simulate up to 12 levels of high voltage direct storage system. In the simulation, the energy storage battery is emulated in the CPU, while the three-phase power grid and energy storage unit cascade modules are simulated in the FPGA. The physical IO interface or fiber optic SFP is used to connect to the actual controller. The energy storage battery state information is transmitted to the Battery Management System (BMS) through communication protocols such as MODBUS and CAN, thus completing the testing of the high voltage direct storage system. The powerful CPU, FPGA simulation capabilities, and device-level parallel expansion capabilities of the MT 8020 real time simulator assist enterprises in performing functional testing and technical updates for various high voltage direct storage systems.
A 1.35us step size can simulate the detailed model of a 12-level high-voltage direct-connected energy storage system, which includes 144 PWM signals.
Support high speed and wide voltage range (-25V, 25V) digital input, adapted to industrial inverter controller interface; support MODBUS TCP, MODBUS RTU, CAN, serial port and other professional power communication protocols, convenient to achieve information interaction with the controller.
Support parallel simulation on multiple CPU cores, and a single-core CPU can handle the operation of hundreds of energy storage batteries with a simulation step size of 50 microseconds.
Support up to 8 sfp fibre-optic signal modules, can easily achieve physical IO expansion or multi-device parallel simulation, to meet the requirements of HVC large system testing.
Provide professional automation test Python API, convenient for industrial users to develop automation test project; support “HIL Scope” high-speed recording function, can achieve 500k sampling rate for multi-channel waveform observation.
According to the testing standard requirements of the "Technical Specifications for Energy Storage Inverter Testing", different active and reactive power instructions are set while the energy storage inverter is operating in normal grid-connected mode, and the changes in active and reactive power of the energy storage inverter are observed to determine if they accurately and rapidly track the active and reactive power instructions.
According to the testing standard requirements of the "Technical Specifications for Energy Storage Inverter Testing", the response capability under different transient voltage drop conditions is tested to ensure that the energy storage inverter can operate stably and safely during grid voltage fluctuations.
According to the testing standard requirements of the "Technical Specifications for Energy Storage Inverter Testing", the energy storage inverter must safely and stably achieve grid-connected/off-grid switching.
According to the testing standard requirements of the "Technical Specifications for Energy Storage Inverter Testing", the minimum time for charge-discharge transition of the energy storage inverter should be less than 100ms.
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