KRSVG High-Voltage Dynamic Reactive Power Compensation Device
Short Description:
The KRSVG series high-voltage dynamic reactive power compensation device is a reactive power compensation system centered on IGBT technology. It can quickly and continuously provide capacitive or inductive reactive power, achieving control of constant reactive power, constant voltage, and constant power factor at the measurement point, ensuring stable and efficient operation of the power system. In distribution networks, installing medium- and small-capacity KRSVG products near certain loads (such as electric arc furnaces) can effectively improve the power quality at the connection point between the load and the public grid, such as enhancing the power factor, overcoming three-phase imbalance, eliminating voltage flicker and fluctuations, and suppressing harmonic pollution.
Product details
Product Overview:
KRSVG series high-voltage dynamic reactive power compensation device is a reactive power compensation system with IGB as the core, which can quickly and continuously provide capacitive or inductive reactive power power, realize the control of constant reactive power, constant voltage and constant power factor at the assessment point, and ensure the stable, efficient and local operation of the power system. In the distribution network, installing small and medium-capacity KRSVG products near certain loads (such as electric arc furnaces) can improve the power quality at the connection point between the load and the public grid, such as increasing the power factor, overcoming three-phase imbalance, eliminating voltage flicker and voltage fluctuations, and suppressing harmonic pollution.
Application areas and uses
KRHYSVG series products can be widely used in petrochemical, power system, metallurgy, electrified railway, urban construction and other industries, for various asynchronous motors, transformers, crystal 17-tube converters, frequency converters, induction furnaces, lighting equipment, electric arc furnaces, electric locomotives, hoists, cranes, stamping machines, cranes, elevators, wind turbines, elevators, electric welding machines, resistance furnaces, quartz melting furnaces and other equipment to provide high-quality and high-reliability reactive power compensation and filtering solutions.
KRSVG series products can enhance power transmission capacity, reduce power loss, compensate for reactive power, control harmonics, suppress flicker, stabilize grid voltage, balance three-phase systems, change the damping characteristics of the system, and improve system stability.
Product features:
KRSVG series products adopt modern power electronics, automation, microelectronics and network communication technologies, and adopt instantaneous reactive power theory and power solution algorithm based on synchronous coordinate transformation.
It is operated with the set reactive power properties and magnitude, power factor, grid voltage, etc. as the control target, dynamically tracks the changes in power quality of the power grid to adjust the reactive power output, and can realize the curve setting operation and improve the quality of the power grid.
The easy-to-operate, high-performance, and high-reliability HYSVG series products are designed to meet the urgent needs of users to improve the power factor, control harmonics, and compensate for negative sequence currents in transmission and distribution networks, and have the following characteristics:
●Modular design, easy to install, debug and set.
● Fast dynamic response speed, response time ≤ 5ms.
● Output current harmonics (THD) ≤_3%.
●A variety of operating modes to meet the needs of users, the operating modes include: constant device reactive power mode, constant assessment point reactive power mode, constant assessment point power factor mode, constant assessment point voltage mode, load compensation mode, and the target value can be changed in real time.
●Real-time tracking of load changes, dynamic and continuous smooth compensation of reactive power, improving the system power factor, real-time control of harmonics, compensating for negative sequence current, and improving the quality of power supply to the power grid.
● Suppress voltage flicker, improve voltage quality, and stabilize system voltage.
●KRSVG circuit parameters are carefully designed, with low heat generation, high efficiency and low operating cost
●The equipment is compact and occupies a small footprint.
●The main circuit adopts the chain structure of the sunbridge power unit composed under IGB, each phase is composed of multiple identical power units, and the output of the whole machine is a step wave superimposed by PWM waveform, which is close to sine, and the sine degree is good after the output reactance filtering.
●KRSVG adopts redundancy design and modular design to meet the requirements of high system reliability.
●Modular design of power circuit, simple maintenance, good interchangeability.
●Complete protection functions, with over-voltage, under-voltage, over-current, unit overheating, uneven voltage and other protections, and can realize waveform recording at the moment of failure, which is convenient for determining fault points, easy to maintain, and high operating reliability.
●Human-machine interface friendly display, external communication provides RS485 and other interfaces, using standard Modbus communication protocol. In addition to real-time digital and analog display, operation history event record, historical curve record query, unit status monitoring, system information query, historical fault query and other functions, it also has special functions such as system self-test, one-button start-stop after power transmission, time-sharing control, oscilloscope (AD channel forced recording), and instantaneous voltage/current waveform recording of faults.
●KRSVG design includes interfaces that can be used with FC to achieve an effective combination of fixed and dynamic compensation, providing users with a more economical and flexible compensation scheme.
●There is no transient impact during switching, no closing inrush current, no arc reignition, and re-casting without discharge.
●When connecting with the system, there is no need to consider the AC system phase sequence, and the connection is convenient.
●Can be installed in parallel, easy to expand capacity. Parallel operation uses optical fiber communication, fast communication speed, and can meet the requirements of real-time compensation.
Main technical parameters
Rated working voltage: 6kV, 10kV, 27.5kV, 35kV;
Rated capacity: 11~±100Mvar;
Output reactive power range: continuous change from the inductive rated reactive power to the capacitive rated reactive power range
Response time: ≤5ms;
Overload capacity: 1.2 times overload for 1min;
Output voltage total harmonic distortion rate (before grid connection); ≤5% ：
Output Current Total Harmonic Distortion Rate THD: ≤3%
System voltage imbalance protection, setting range: 4%~10%;
Efficiency: 99.2% ≤ rated operating conditions;
Operating temperature: -20°C~+40°C;
Storage temperature: -40°C~+65°C;
Man-machine interface: Chinese color touch screen display;
Relative humidity: the monthly average is not more than 90% (25°C), no condensation;
Altitude: <1000m (above 10000m needs to be customized);
Earthquake intensity: <8 degrees.
