TSC is a new type of high voltage capacitor compensation device is a kind of dynamic tracking of products using all digital intelligent control system, high voltage and high power thyristor imported tube which are connected in series high voltage AC contactless switch, fast switching capacitors to achieve, the response time is less than 20ms. Products from foreign advanced technology, to solve the shortcomings of the traditional compensation control switch device vulnerable, short service life, slow speed, safe and reliable operation of equipment, the effect is good, the performance indicators have reached the domestic advanced level.
High voltage TSC dynamic reactive power compensation device is widely used in high voltage AC and DC transmission system and metallurgy, coal, port crane, electric railway, heavy machinery manufacturing industry, the traffic impact load in distribution network. Its main function is to shock load and time-varying load can be real-time monitoring, dynamic compensation, power factor compensation to more than 0.9, stable system voltage, reduce network loss of power supply system, improve power quality and other characteristics, the user can bring huge economic benefits and social benefits.
Application areas of high pressure TSC
With the wide application of modern power electronic devices and nonlinear loads, which seriously affected the quality of power supply, especially the frequent fluctuation of various power electronic switching devices and application of load is the main interference sources, cause a series of adverse effects on the stability of power grid:
This low power factor, increase power loss, increase the cost of production, reduce production efficiency;
The impact caused by reactive power grid voltage is reduced, voltage fluctuation and flicker, leading to serious transmission device and the protection device is not working properly or even stop;
This leads to the unbalanced three-phase, negative sequence current motor rotor vibration.
This capacitor resonance and harmonic current amplification, the capacitor overload or over voltage, or even burned;
By increasing the transformer loss caused by transformer overheating;
This led to the power of heating equipment, motor torque instability or even damage;
By the acceleration of power equipment insulation aging, easy breakdown;
For the pollution of the power grid, the high voltage TSC dynamic reactive power compensation device which is produced by our company has realized the capacitor switching without transition, without surge suppression and high order harmonics. High voltage TSC device application areas are as follows:
1, long-distance power transmission
Power systems are currently being tended to large power grids, long distance transmission, high energy consumption, forcing the power transmission and distribution systems have to be more effective. High voltage TSC can significantly improve the power system performance in different grid conditions, in order to maintain a balanced voltage, can be installed in a high voltage TSC power grid and at the appropriate location, in order to achieve the following purposes:
* system voltage stability
To reduce the transmission loss.
By increasing the power grid transmission capacity, to maximize the efficiency of the existing power grid
To improve the transient steady state limit.
2, rolling mill
The reactive load of the rolling mill will have the following effects on the power grid:
The decrease of the power factor.
Can cause voltage fluctuation and voltage drop, so that the electrical equipment can not work seriously, reduce the efficiency of production
Transmission device. The load will produce harmful harmonics, odd harmonics and main side frequency in 5, 7, 11, 13 times as the representative, will make a serious distortion of grid voltage
TSC high pressure valve group and FC high voltage harmonic suppression type capacitor filter or combination of the two, can reduce the steel rolling mill load voltage fluctuation of the power supply system, harmonic filtering or suppression of mill production, increase the power factor of system.
3, lifting machine
This hoist produces impact on power at work:
Can cause voltage fluctuation and voltage drop
It makes the low power factor
It increased the loss of equipment and power transmission lines
The high voltage TSC device can reduce the voltage fluctuation of the power supply system and improve the power factor of the system.
4, City two substation
In the regional power grid, high voltage TBB fixed reactive power compensation and voltage TSC dynamic reactive power compensation of reactive power compensation system, high voltage TBB fixed reactive power compensation is used to compensate for the relatively stable inductive load, high voltage TSC dynamic reactive power compensation is used to compensate the fluctuation of inductive load. The combination of the two methods can not only guarantee the compensation accuracy, but also can realize dynamic tracking compensation, and the cost of equipment is reduced.
5, electrified railway power supply system
The mode of transportation of electric locomotive in protect the environment but also on the power grid caused serious pollution, single-phase electric locomotive three-phase power supply network caused serious imbalance and low power factor, and negative sequence current. The high voltage TSC can improve the three-phase unbalance and improve the power factor of the system.
Composition and technical characteristics of high pressure TSC
The high voltage TSC dynamic reactive power compensation device is composed of an optical fiber trigger control system, a valve control system, a pulse transformer, a reactor, a capacitor and a protective element. The control system is designed to detect the power quality, to realize the intelligent input, and to remove the power factor of the capacitor. When the controller detects the real-time power factor, automatically determine the capacitor number required for the input, output signal, control valve controller to conduction will capacitor into the operation of the thyristor is specified; when the load reactive power is lower than the setting value, the controller of thyristor to the corresponding valve to stop sending trigger signal, thyristor valve on-off, capacitor exit operation. The above working condition is completely automatic, to ensure that there is no impact, no flow, no transition process.
1, thyristor valve group structure
The high pressure heat pipe heat radiation structure 10kV and the 6KV high voltage thyristor valve group adopt the single phase horizontal, the three-phase superposition vertical structure, the structure is compact, the area is small. 10KV and 6KV high voltage thyristor valve group in series with a certain number of thyristor; other accessories as there are heat sinks, voltage / damping capacitors and resistors, high voltage trigger plate and the support frame, etc..
2, control cabinet structure
The high voltage TSC control cabinet is composed of reactive power regulator, silicon element state monitor, special large capacity reserve power supply device (UPS), and corresponding indication instrument and meter, button and so on. Reactive power regulating controller uses DSP+MPU dual processor architecture, including DSP, the use of imported high speed floating-point signal processor, using industrial grade MPU embedded processor; optical transceiver light emitted by the light receiving plate, plate, plate and electric distribution buffer plate.
3, SCR trigger circuit system
Thyristor valve series in the medium voltage power grid work, when the trigger instant or thyristor valve string in the normal conduction, the pressure drop of each tube is very low, about 2V, the trigger current is several hundred ma. When the thyristor valves stop working when the capacitor through the diode string charging, the charging voltage is approximately equal to the peak power line voltage of the thyristor valve on the AC voltage and the capacitor to withstand the DC voltage and power grid, voltage resistance value of six times at least higher than the rated line voltage of the power diode and so thyristor valve string. In this case, the control circuit and the main circuit of the insulation problem is particularly important. Trigger circuit to send a trigger command to the medium voltage thyristor valve string work. Only by doing the trigger circuit and the main circuit of the insulation, in order to ensure the safety of the system. The thyristor trigger circuit is mainly composed of a photoelectric conversion device and a pulse transformer.
4, capacitors and reactors
The single-phase shunt capacitor can be selected according to different types of capacitor power supply system and the load conditions; single-phase series reactor can choose different reactance ratio according
to the reactor power supply system and on-site load conditions, the reactor can also choose dry type iron core, dry-type air core reactor according to the load and the user's requirements.
5, technical characteristics:
It tracks the variation of load, dynamic compensation of reactive power, improve the power factor of the system;
Using optical fiber trigger technology, electrical isolation between a system and the two system, solve the problem of interference, did Gao Ke
Reliability and controllability;
Apply imported thyristor controlled capacitor switching, realize the zero crossing switching capacitor, no surge current, improve the service life of the equipment;
This capacitor switching process without surge current, overvoltage, no arc reignition;
This dynamic harmonic suppression of the system, improve the voltage distortion rate, the main circuit design fully consider the problem of amplification of harmonic current of capacitor group, to ensure the safe operation of equipment, reliable work;
It realizes full digital controller, liquid crystal display, having the network communication function;
This controller has high reliability, and simple operation, and system connection, does not need to consider the AC system phase, complete compensator protection measures;
The valve circuit parameters. The thyristor designed to heat a small, compact structure, small occupied area;
By the control cabinet and the thyristor valve body to transfer information between all adopt high pressure optical fiber, without any electrical contact, completely solve the problem of electrical insulation and low side and high side control;
The thyristor valve. The special monitoring unit can real-time monitor the running state of thyristor, each thyristor valve in the liquid crystal display screen, intuitive and concise.
Using a unique self power supply and high precision DC power thyristor power valve high voltage control circuit, the power output of large capacity, high reliability and power quality stability;
This equipment its harmonic currents, switching transients;
It is suitable for reactive load fluctuation occasions;
Can improve the quality of voltage, system voltage stability, voltage flicker mitigation;
This decrease network loss, high efficiency and energy saving, improve the electrical equipment. |
