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Main Features
Fast response speed and strong ability to suppress voltage flicker
DNSVG response time: 4ms, can complete the mutual conversion from rated capacitance to rated inductive reactive power in a very short time, can meet the compensation of impulse loads, effectively suppress voltage flicker, and prevent power grid accidents.
High operating efficiency and excellent harmonic characteristics
The cascaded DNSVG adopts low loss fully controlled power devices, combined with dedicated control algorithms,to ensure performance with minimal loss and device efficiency of > 99%, it can effectively suppress high-frequency harmonic injection and output current distortion rate-2% when compensating reactive power. Under sufficient capacity, it has the functions of suppressing low order harmonics and compensating for imbalances.
Strong heat dissipation capability
The DNSVG air cooled cooling system adopts a patented intermediate air duct design, and the cabinet top fan adopts a long-life maintenance free outer rotor motor, low-noise design centrifugal fan to ensure the safety and reliability of the overall system.
Strong fault detection and protection capabilities
When in standby mode, it has Hall detection and unit self checking functions. After the system runs it has self-checking and protection functions for voltage, current, temperature, etc, which can detect and automatically isolate faults in a timely manner,ensuring that the system will not affect the power grid and load end equipment. In addition, DNSVG products with bypass function can maintain stable operation during fault isolation.
Diversified system functions
In addition to the conventional constant power factor compensation and constant reactive power compensation functions, DNSVG also has a constant voltage compensation mode: Capable of handling high and low voltage crossings for new energy generation; Equipped with high-voltage self checking and self-starting function to cope with extremely unstable power grids on site, Equipped with multiple parallel operation technologies, capable of handing sites with large capacity and multiple sections of busbars and systems, and has obtained patented technology. (Optional function)
Product Features
The main circuit of the DNSV series high voltage static reactive power generator adopts a cascaded chain structure of power units. The system can be divided into: incoming part, starting part, power part, control part, and cooling part Split cabinet type or split frame type.
Main circuit
The main circuit includes an incoming cabinet, a starting cabinet, and a power cabinet The incoming cabinet is equipped with an isolation switch K, a starting switch, a pre charging current limiting resistor R, and a connected reactor L The power distribution cabinet is also equipped with a converter chain, which is cascaded through identical power units. The power unit contains a DC support capacitor Cd and an IGBT converter circuit.
Pre charge current limiting resistor
The pre charging current limiting resistor R can effectively limit the current before the device starts, protecting the IGBT and DC support capacitor. This resistor has a great thermal capacity and can withstand repeated surge currents in a short period of time.
Connect the reactor
The converter chain is connected to the gid through a reactor L,which converts the output voltage of the converter chain into current and injects it into the grid,smoothing the ripple generated by the converter chain. This reactor is made of high-quality materials and designed with low magnetic density, featuring high linearity, low loss, and anti harmonic characteristics.
Control System
The main control system includes the main controller, power unit driver board, auxiliary control circuit, human-machine interface, and backend monitoring system.
Main controller
The main controller consists of various functional boards, which complete tasks such as AC signal acquisition, switch control, PWM pulse distribution, status detection, and system protection.
Power unit driver board
DNSSVG adopts a LCD touch screen with complete data display (tables, curves, bar charts, information storage, and historical data query functions; The friendly interface design ensures that operators can operate the equipment safely and conveniently.
| Technical Specifications | Technical Parameters |
| Rated Voltage | 6~35kV |
| Compensation Capacity | 0.3~150Mvar |
| Adjustment Range | Continuous, stepless adjustment from rated inductive reactive power to rated capacitive; reactive power |
| Rated Frequency | 50Hz |
| Response Time | <4ms |
| Overload Capacity | 1.1 times for 3 minutes |
| Harmonic Characteristics | Total harmonic distortion of output current less than 2% |
| Cooling Method | Air-cooled/Water-cooled/Air-water-cooled |
| Operating Mode | Constant power factor/Constant reactive power/Constant voltage/Constant current/Combined voltage and reactive power control/Load compensation |
| Install method | Indoor cabinet-style, |
| outdoor container-style | |
| Environment temperature | -40°C~45°C |
| Altitude | <3500m |
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