Automatic Three-Phase Unbalance Regulator
Short Description:
With the rapid development of the national economy and modern science and technology, the scale of modern power systems is continuously expanding, various complex, sophisticated, and electricity-quality-sensitive equipment is becoming increasingly widespread, and users are demanding higher reliability of power grid operation and quality of electricity.
Product details
Product Overview
With the rapid development of the national economy and modern science and technology, the scale of modern power systems is expanding day by day, and all kinds of complex, sophisticated and sensitive power quality power equipment are becoming more and more popular. At present, the market mainly uses SVG regulation scheme and transphase capacitor compensation scheme, our company comprehensively considers the cost of three-phase imbalance treatment, treatment effect and reactive power compensation and other factors, for the above two schemes to integrate, develop a hybrid compensation scheme, while effectively controlling the three-phase imbalance, take into account the reactive power compensation, to optimize the power quality of the power grid, improve the power factor of the purpose. In this compensation scheme, the control DSP in the SVG module is used as the overall compensation control core, and the SVG module and the cross-phase compensation capacitor communicate through RS485 for unified and coordinated compensation, and the transphase capacitor is used for imbalance and reactive power rough compensation. Solve the power quality problem of low-voltage power grid from the root, improve the reliability of power supply, reduce the loss of the distribution network, reduce the workload of on-site inspection and load adjustment of operation and maintenance personnel, and improve work efficiency.
1. Working principle
1.1 Passive capacitor interphase compensation part
The
thyristor switch is controlled by the interphase compensation controller to connect the capacitor between the lines and the active power is transferred by using Wang's law to compensate for the interphase reactive power.
When investing, the power factor is used as the main criterion, and combined with the difference between the active power between the phases, the capacitors with large active power differences between the phases are given priority.
1.2 Active capacitor interphase compensation part
Low-voltage three-phase load imbalance automatic adjustment device is an intelligent compensation device for distribution network developed based on modern power electronics technology, dynamic reactive power compensation technology and other technologies.
The fully digital control system based on DSP+FPGA is adopted, which ensures the accuracy and reliability of the PWM pulse waveform, and reduces the probability of overvoltage and overcurrent accidents caused by software crashes.
Voltage PWM wave converter circuit structure and IGBT power conversion are adopted. The module circuit adopts a three-level topology, and the inverter output voltage waveform is closer to the sine wave, and the conversion efficiency is improved. The three-phase load imbalance automatic adjustment device can analyze the load imbalance between the three phases according to the AC sampling of the AD sampling circuit at the moment of power-on, and the DSP calculates the current value and phase to be compensated, and the FPGA signal generator sends a PWM signal to the IGBT drive, and the inverter generates a current signal that meets the requirements and sends it to the system, so as to realize the three-phase load balance adjustment, dynamic reactive power compensation, and harmonic control function requirements.
2. Functional characteristics
1. Modular, wall-mounted structure design, easy to install;
2. Flexible setting of unbalanced compensation, harmonic compensation, and reactive power compensation.
3. Dynamic, bidirectional, continuous and reactive power adjustment;
4. DSP+FPGA full digital control system, safe and reliable operation;
5. The IGBT power conversion circuit adopts a three-level topology and has high operating efficiency;
6. The response speed is 10MS lower;
7. GPRS remote monitoring, wireless WIFI on-site monitoring;
8. The background software realizes the monitoring of power quality data.
3. Technical parameters
Grid parameters | Rated line voltage | 380V |
Phase voltage range | 138V～265V | |
Rated frequency | 50Hz/60Hz adaptive | |
Frequency range | 45Hz～63Hz | |
Performance Structure Parameters | Capacity Class (A) | 45 75 150 300 |
Unbalanced current regulation range | 0～45A/0～75A/0～150A/0～300A | |
Compatible with Transformers (KVA) | 100/200/250/315/400/500/630 | |
Device structure and installation method | Modular, wall-mounted, outdoor post-mounted | |
How the program works | reactive power compensation, imbalance compensation, harmonic compensation imbalance compensation, reactive power compensation, harmonic compensation Unbalanced compensation, reactive power compensation Unbalanced compensation, reactive power compensation | |
Housing material | The module is made of galvanized sheet, and the box is stainless steel | |
Control system | DSP+FPGA fully digital control system and inverter system three-level structure | |
Human-machine exchange | Night crystal, touch screen operation | |
Capacity expansion capabilities | Support multi-module parallel work | |
Approach to the line | Side inlet line, down inlet line | |
Communication mode | GPRS remote communication, wireless WIFI on-site monitoring | |
Protection level | IP44 | |
Voice | ≤60db（A） | |
Structure Dimensions (W*D*H) | 600*500*1000 600*600*1000 | |
Governance effect | Imbalanced | The unbalanced current is completely eliminated, and the unbalanced voltage caused by the unbalanced current is completely eliminated. |
Harmonic compensation rate | The harmonic compensation rate is more than 92% | |
Power factor | No power dynamic continuous compensation, power factor above 0.99 |
