Constant Current Source Power Grid Simulator for Laboratory Testing
The Definition and principle of Power grid simulator
It is a kind of AC power supply which can simulate the output of power grid. The three-phase output can be adjusted independently. It can stack harmonics and do low voltage ride through experiment. The utility power is connected to the three-phase PWM rectifier through the isolation transformer and three-phase reactance to form a stable DC voltage,Three groups of independent single-phase PWM inverter are used to invert the DC voltage, and the output is isolated by transformer LC filter. Three groups of single-phase constitute three-phase power supply output. The main circuit structure of the simulator is power grid analog power supply and its control method.
At present, it has been widely used in solar inverter testing and identification institutions, solar inverter research and development, University electrical laboratory, home appliance enterprise laboratory, product acceptance and daily maintenance testing.
Main functions of power grid simulator
● The three-phase voltage can be adjusted independently, and the phase setting range is 0-360 degrees
The output three-phase voltage value and phase can be adjusted independently without mutual influence. The voltage of each phase (2 phases) can be set arbitrarily. The phase can be adjusted from 0 to 360 degrees without dead angle.
● It can inject multiple harmonics to simulate the quality adaptability test of power grid
The interference source can be created by human intervention, the harmonic number can be superimposed 2-50 times, at the same time, more than 5 kinds of different harmonics can be injected, and the total harmonic content is not less than 15%.
● It has synchronous trigger function, which is convenient and accurate for zero, low and high voltage ride through test
With single-phase / two-phase independent low through and high through functions, the voltage can drop below 5V instantly, drop to 1% of the set voltage, rise to 150% of the working voltage, and the dynamic response is 1ms. It can meet the low voltage ride through test detection of Solar inverter and wind turbine type test. It is also suitable for grid connection acceptance of Solar power station, grid connection acceptance of wind farm, type test of Solar inverter and low voltage ride through detection platform of wind turbine
● The output frequency is 45-65hz, continuously adjustable, and the step distance is 0.01Hz. It is easy to do under frequency experiment and anti islanding experiment
● It has memory function, and can set several groups of common voltage, frequency and phase parameters for storage, which is convenient to use with one key
● With step programming mode, each step can set the output voltage, frequency, operation time, etc., cycle operation and cycle times
● It has the mode of gradual change and jump of output voltage and frequency, and can set the starting voltage and frequency of gradual change, and the ending voltage, frequency and time of gradual change
● High measurement accuracy, suitable for testing half sine wave and other similar waveforms with DC component
● Output current and voltage limiting function
● Protection mode: overvoltage, overcurrent, overheating, overload, short circuit, current limiting, voltage limiting, etc
● For 100% unloading and loading, the reaction time is less than 20ms, the overload capacity is strong, and the instantaneous current can bear three times of the rated current
Technical parameter
| Model | AC2000-33300 | AC2000-33600 | AC2000-331000 | AC2000-332000 | AC2000-334000 | AC2000-336000 | AC2000-338000 | ||
| Capcity | 30kVA | 60kVA | 100kVA | 200kVA | 400kVA | 600kVA | 800kVA | ||
| AC input |
Phase | 3P4W+PE | |||||||
| Voltage | Phase voltage：220V±10%，line voltage：380V±10% | ||||||||
| Frequency | 50/60Hz±3Hz | ||||||||
| AC output | Phase | 3P4W | |||||||
| Voltage | Phase voltage：10～300.0V | ||||||||
| Frequency | 45.0～65.0Hz | ||||||||
| Rated voltage（220Vac） | 90A | 136A | 180A | 302A | 607A | 911A | 1215A | ||
| Set voltage accuracy | Resolution: 0.1V, accuracy: 0.2% × Read value + 0.2% × Full scale value | ||||||||
| Set frequency accuracy | Resolution: 0.1Hz, accuracy: 0.05% | ||||||||
| Test voltage accuracy | Resolution: 0.1V, accuracy: 0.2% × Read value + 0.2% × Full scale value | ||||||||
| Test frequency accuracy | Resolution: 0.1Hz, accuracy: 0.05% | ||||||||
| Current | Resolution: 0.1a/1a, accuracy: 0.3% × Display value + 0.3% × Rated output value | ||||||||
| Power | Resolution: 0.1kw/0.01kw/0.001kw, accuracy: 0.45% × Read value + 0.45% × Full scale value | ||||||||
| Frequency stability | ≤0.1% | ||||||||
| Voltage distortion | Line load：THD＜2% | ||||||||
| Transient recovery time | 20ms | ||||||||
| Voltage peak coefficient | 1.41±0.1 | ||||||||
| Source voltage effect | ≤1% | ||||||||
| Load effect | ≤1% | ||||||||
| Overload capacity | 105% < output ≤ 110% turn off the output in 10 minutes; Turn off the output in 5 minutes when 110% < output ≤ 120%; 120% < output ≤ 150% 2 seconds to turn off the output; | ||||||||
| Protect | IGBT overheating, IGBT overcurrent, transformer overheating, output overvoltage, output undervoltage, output overcurrent, output overload and output short circuit | ||||||||
| Efficiency | ＞86% | ||||||||
| Display mode | LCD | ||||||||
| Online adjustment function | The output voltage and frequency can be adjusted on line (45.0 ～ 65.0hz) | ||||||||
| Function | 1. Based on the principle of rectifier + inverter, it can realize 100% energy flow in both directions between load and power grid, and has two functions of power supply and load. 2. Single phase or three-phase AC output can be selected. 3. It can simulate low voltage ride through (LVRT) test curve. 4. It can synthesize fundamental wave and each harmonic wave to simulate power quality adaptability test. 5. With step programming mode, each step can set the output voltage, frequency, operation time, etc., can set the cycle operation, and can set the number of cycles. 6. AC output has a variety of programming modes, which can realize the gradual change and jump of output voltage and frequency. The starting voltage, frequency and ending voltage, frequency and time of gradual change can be set 7. Phase setting range: 0-360 degrees; 8. It can control the change rate of voltage and frequency. 9. The output limits of voltage and current can be set |
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| Communication interface | RS485 (standard), RS232 (optional), Ethernet (optional) | ||||||||
| Temperature | 0～40℃ | ||||||||
| Humidity | 20～90%RH | ||||||||
No.220 Huayuan Road Jinan city China