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Inquiry

(I) Product Overview

MDPA product is a comprehensive solution suitable for low-voltage distribution network. It uses advanced power electronic technology to adjust the imbalance of three-phase load. At the same time, it can also detect the reactive current in the load in real time and invert the opposite compensation current through IGBT to ensure that the feed-in current from the power grid is the active balance current, reduce the pollution of the power grid and realize "green" power supply.

a) Working principle

MDPA detects the load current in real time through an external current transformer, decomposes the detected current into positive and negative sequences, extracts the unbalanced current and reactive current, and these signals enter the DSP for calculation and processing to obtain the comprehensive compensation current that MDPA needs to output, and then generates a PWM signal to drive the IGBT to act, redistribute the load current to the grid side, and realize reactive compensation at the same time. The core function of the product is that it can operate at a speed 500 times faster than the current conversion speed to be compensated, realizing real-time adjustment of impedance. The working principle of MDPA is as follows:

B) Main functions of MDPA

1) Adjust the three-phase unbalanced current, three-phase unbalanced compensation function

2) Compensation part of the three-phase distribution network line reactive current to improve the power factor.

c) Technical features of MDPA:

1) Powerful, one-stop solution for power quality

Ø Three-phase unbalance compensation function

Ø Voltage compensation function

Ø Dynamic real-time tracking system reactive power changes, no extreme difference compensation system reactive power, there will be no over, under-compensation phenomenon

Ø Two-way compensation system reactive power

Ø Harmonic filtering function (option)

Ø Support remote data transmission function (option)

2) Excellent compensation effect

Ø MDPA is an active compensation device, which is a current source device composed of modern power electronic devices IGBT, which avoids the resonance phenomenon caused by traditional capacitor components in mechanism, and is more stable and safe.

Ø Using high-speed DSP FPGA full digital control system, fast response to load changes, automatic real-time adjustment, response time is less than 15 milliseconds.

3) Using three-level topology, compared with the traditional two-level inverter, the three-level output voltage ladder waveform makes the compensation current more close to the sine wave;

4) MDPA has perfect protection functions: overvoltage protection, undervoltage protection, overcurrent protection, overheat protection, short circuit protection, etc.

5) Modular design, easy to expand, easy to transport, easy to maintain, engineering design and installation workload is small.

6) Low noise design

7) Small size and light weight.

d) Product application

The company's MDPA products have been applied in a number of local power supply companies, the use of good results. It can effectively solve the problem that the voltage pass rate of the low-voltage 400V system of the transformer on the outdoor column is not high, effectively solve the problem of the current imbalance of the client, and optimize the operating conditions of the low-voltage distribution transformer; DPA can also compensate reactive power and improve the power factor.

(II) product model

(III) product parameters

Product Model	MDPA-030	MDPA-050		MDPA-100
Rated voltage class	400V
Input phase voltage range	-40%～+20%
Grid frequency	50Hz (range: 45Hz ~ 55Hz)
Overall efficiency	> 97.5% (rated full load)
Dimensions	600mm × 390mm × 1100mm			Custom
Three-phase balance compensation capability	Unbalance <3% (within capacity)
Rated current of device	50A		75A		100A
Response time	<10ms
CT Requirements	Class 0.5 or above, secondary side current 5A, outdoor type
man-machine interface	7 inch LCD screen
Installation method	H-bar, F-bar (installation inclination angle less than 5 degrees)
Incoming mode	Box bottom incoming line
Cooling mode	forced air cooling
Protection level	IP54
Noise	＜70dB(A)
Protection function	Overvoltage protection, undervoltage protection, short circuit protection, inverter bridge reverse protection, over compensation protection, lightning protection double protection and so on
Communication Protocol	Modbus protocol (adjustable according to project progress)
Remote Cloud	Support WIFI (optional)
Relative humidity	Maximum 95%, no condensation
Ambient temperature	-25 ℃ ~ 55 ℃