Coal Mine Explosion-Proof Static Var Compensator¹

Product Description Product introduction:BJS1 series mine explosion-proof and intrinsically safe static var generator (SVG for short) is a static var compensation device based on high-power converter technology. SVG is one of the key equipment in the field of FACTS technology products. It is based on a three-phase high-power voltage inverter as its core. Its output voltage is connected to the system through a connected reactance, and maintains the same frequency and phase with the system side voltage. The relationship between the output voltage amplitude and the system voltage amplitude determines the nature of the output power. When the amplitude is greater than the system side voltage amplitude, capacitive reactive power will be output, and inductive reactive power will be absorbed when the amplitude is smaller. Compared with traditional reactive power compensation equipment, SVG has a fast response speed. Its reactive current output can be constant within a wide range of voltage changes. It can still provide strong reactive power support when the voltage is low. Continuously adjust to the full range of the capacitance, and play the role of controlling the grid reactive power current, adjusting and stabilizing the system voltage, and increasing the system oscillation damping in the system.At present, a large number of converters and speed-regulating devices such as frequency converters are used in coal mines, causing harms such as higher harmonic content of the power grid and lower power factors. It is necessary to compensate the power grid on-site to improve the operating conditions of the power grid. SVG can detect the power grid in real time. Active and reactive power, and control them to supplement the corresponding reactive power to the power grid to achieve the purpose of improving the power factor of the power grid and filtering out higher harmonics.Product application range:This product is mainly used in underground coal mine hub substations, mobile substations and other occasions to improve system transient voltage stability, ensure system operation safety, suppress voltage flicker, compensate unbalanced load, filter load harmonics and improve load power factor. It can be used in metallurgical industry, petrochemical industry, mine electrification railway and other industries.Technical Parameters:1. Rated input voltage: AC660V, AC1140V, AC3300V;2. Rated capacity: 400KVar; 500KVar; 1500KVar;3. Work system: continuous work system;4. Cooling method: heat pipe radiator cooling.Performance characteristics:1.Small starting impactThe SVG part adopts self-excited start, which has a fast start speed and the inrush current is limited to a small amplitude;2.Any combination of continuous compensation rangeSVG can continuously output reactive power from rated inductive conditions to rated capacitive conditions, and can be combined with fixed capacitors to form continuous compensation in any range;3.Fast dynamic responseSVG has fast output reactive power characteristics within 10ms, so it has a better compensation effect for rapid impact loads and a better suppression effect on flicker;4.Excellent harmonic output characteristicsSVG can output a reactive current similar to a sine wave (excluding harmonics, used for grid compensation), or output a set number of harmonic currents (used for load harmonic filtering), that is, the SVG output current is completely active Controllable and fully meet the needs of users;5.Small footprintSVG uses an inverter composed of semiconductor power devices as the core, uses DC capacitors to store energy, and uses heat pipe heat dissipation technology to dissipate heat. It is small in size and is especially suitable for occasions that require high floor space;6.High efficiencySVG adopts new low-loss IGBT power devices, direct output voltage range of 1KV-35KV, eliminating the need for connecting transformers, the device efficiency can reach more than 99%;7.Superior compensation abilityThe output current of SVG does not depend on the system voltage, and is characterized by a constant current source. It can still output the rated reactive current when the system voltage drops to 20%, and has a wider operating range;8.High reliabilitySVG adopts N+1 or N+2 redundant main circuit topology, one (or two) chain link units can continue to run at full load after damage;9.Multiple compensation functionsSuppress power system overvoltage, improve system voltage stability, increase system transient stability level, reduce the number of low-voltage release loads, and prevent transient voltage collapse. Dynamically maintain transmission line terminal voltage and increase transmission line steady-state transmission power limit; damping power System power oscillation; on the load side, it can suppress voltage flicker, compensate load imbalance, improve load power factor, and filter out harmonics.10.Modular circuit structureThe core of SVG is a chain inverter based on IGBT devices. Each phase of the chain inverter is composed of multiple power module outputs in series, and the power modules adopt N+1 or N+2 redundant operation structure;11.ControlIt adopts the fully digital controller MLCCON based on three DSPs and multiple FPGAs, which has high integration and high reliability; the control mode can be set on site: system compensation or load compensation and load compensation harmonic order; adopts fast instantaneous reactive current control strategy , It can realize the continuous and stable operation of the system when the system is short-circuited. The imported PLC is used to realize the management and switching control of multiple fixed capacitors;12.Man-machine connection monitoring and man-machine interfaceThe local monitoring function is completed by DSP and imported PLC. It adopts touch screen Chinese/English display interface, which is more reliable than embedded industrial control interface hardware and is more suitable for industrial field electromagnetic environment; local monitoring panel can carry out various control operations and parameter settings; The display panel has the functions of power module DC voltage, power module fault/bypass status, output current, load current, fault display and fault recall, and can display the output current waveform;13.Parameter setting functionIt has a variety of functional parameter settings to facilitate the on-site configuration of operating parameters of different load objects; Chinese prompts for all functional parameter items, and all functional parameters have the power-off retention function (double copies), which can be backed up or restored as a whole;14.Continuous power controlThe control power supply adopts multi-module parallel operation and has a DC UPS backup. When the AC control power fails, the DC UPS backup provides the control power, and the operation of the device is not affected;15.Electromagnetic compatibilityThe power module and the main control system are connected by optical fiber, which has a high communication rate and anti-interference ability, and good safety.The specially designed electromagnetic shielding measures in the cabinet make the device not affected when working in an environment with electromagnetic interference, and at the same time, other equipment will not be affected by the electromagnetic field generated by the device.Dimensions:Product model specificationDimensions (length * depth * height) (mm)Weight (ton)BJS1-400/6602000*1100*13002.3BJS1-500/11402500*1100*13002.8BJS1-1500/3.3KV3000*1200*14506.5

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