3.problems svc-- static var or solved
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Problems SVC-- Static Var Compensator solved:
1. For electric arc furnace
Electric Arc Furnace as a nonlinear and erratic load in the power grid will bring a
series of adverse effects to the power grid, such as:
1. Lead serious three-phase unbalance of the power grid, create negative
sequence current.
2. Produce high order harmonics, such as coexist of 2ed, 4th even harmonics
and 3rd, 5th, 7th odd harmonic, then make severe voltage distortion become
more complicated.
3. Serious voltage flicker.
4. Low power factor.
The beat method to completely resolve the problems mentioned above is to install
fast-acting reactive power compensation device (SVC). The response time of SVC
system of RXPE is less than l0ms, which met the strict technical requirements. The
SVC can supply reactive current to electric arc furnace and stabilizes the voltage level
in the power grid. Then the output of the metallurgical active power can be increased,
and the impact of flicker can be minimized. The separated phase compensation
function of SVC can eliminate the three-phase unbalance caused by electric arc
furnace. The filtering devices of the SVC, can remove the harmful high order
harmonics so as to improve power quality, then the power factor can be increased
through providing capacitive reactive power to the system.
2. Forrolling mill
During working, the reactive power impulsion caused by rolling mill and other
industrial symmetry loads will lead to the following problems to the power grid:
1. Degrade the voltage level and create voltage fluctuation, even make the electrical
equipment inoperative, and reduce the production efficiency.
2. Lessen the power factor
3. Harmful high order harmonics in transmission device of load, mainly including
odd harmonics, such as 5th, 7th, 11th, 13th and side frequency, which will create
serious distortion of voltage level.
RXPEs SVC can remove the above problems to maintain a stable bus voltage, avoid
the harmonic , and make the power factor close to 1.
3. For Power supply of electric locomotive
Electric locomotive transportation also generates the averse effect to the power
grid. Because the electric locomotive is single phase power supplied, such
single-phase load causes a serious three-phase unbalance in the power grid and a
low power factor, then negative sequence current is formed.
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Presently, the only method to resolve this problem is to install SVC at appropriate
locations along the railway. The three-phase balance of the power grid is got
through the quick isolated phase compensation function of SVC, and the improved
power factor is achieved through filters. RXPE can supply the SVC to solve the
problems perfectly.
4. Forhoist
Hoist and other heavy loads will have the following effects on power grids when they
are at the working state:
1. Reduce the voltage level and generate voltage fluctuation in the power grid.
2. Low power factor
3. Harmful high order harmonics in transmission device
All of these problems can be removed by use of RXPEs SVC.5. ForLong-distance power transmission
In the global electric power industry, we are trending to conduct long-distance
electricity transmission. The high energy consumption requires the transmission and
more effective distribution system. SVC can significantly improve the transmission
and distribution performance of power system, which has been widely proved in the
world. In order to maintain a balanced voltage as the power system in different
conditions, the installation of SVC at one or more suitable locations of the power grid
is necessary. The following purposes are achieved:1. Stabilization of the voltage of weak system
2. Reduction of the transmission losses
3. Increment of transmission capacity makes the existing power grid play its
maximum efficiency
4. Increment of transient stability limit
5. Increment of damping under small interference
6.Enhancement of voltage control and stability
7. Elimination of power fluctuation
6. ForSecondary substation in city (66/110 kV)
In regional power grid, we generally use the TSC to compensate the reactive power
and improve power factor. However, this method can only provide capacitive reactive
power to the system, but not achieve rapidly and precisely regulation with the changes
of load which is easy to cause inverted injection of reactive power to the system, the
fluctuation of the bus voltage, the damage of the electrical equipment and instability
of the system.
RXPEs SVC system can quickly and accurately make capacitive and inductivereactive power compensation. When SVC stabilizes the bus voltage and improves
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the power factor, the inverted injection of reactive power is solved thoroughly. In
addition, the SVC may take full advantage of original existing fixed capacitors
bank, achieving the best efficiency with the least investment. It becomes the most
effective way to improve the quality of power supply of regional power grid.
Working principles of SVC-- Static Var Compensator:
Principle of TCR Type SVC
While the SVC is installed into the system, the capacitor provides fixed capacitive
reactive power Qc, the current passing through the compensation reactor determines
the amount of the inductive reactive power QTCR outputted by the compensation
reactor. The inductive reactive power offset the capacitive reactive power. As long as
the reactive power of the system Qn=Qv (required by the system)-Qc+
QTCR=constant (or 0), it can be realized that power factor of electrical network is a
constant. The voltage will not change, what is of importance is the required current
passing through the compensation reactor on the triggering angle which is used to
control the thyristor. The converter and control system of the thyristor can achieve
this function, collecting current value and voltage value of reactive power of the bus
to compose the value of reactive power. Compared with the set constant value of
reactive power (may be 0), the magnitude of triggering angle is calculated, and the
required current pass through the thyristor is got.
As for asymmetric loads, by the theory of Steinmets, the system achieves separated
phase regulation, which can eliminate negative sequence current, and balance
three-phase of the power grid.
Configuration of SVC-- Static Var Compensator:
1. Full digital control system:
Cabinet structure; used to calculate reactive power of the electrical network at
real-time, control magnitude of triggering angle of thyristor so as to control the
amount of compensation of reactive power.
2. Thyristor converter:
1.Frame structure.
2. Receive signal from the control system, change size of the triggering angle of
thyristor, generate corresponding reactive power compensation current.
3. Compensation reactor:
1.Tubular dry type, double coils at top and bottom, natural cooling.
2. When the current passing through the thyristor flows through the compensationreactor, it generates the inductive reactive power required by the system, which is
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used to balance the reactive power of the system and maintain stability of bus voltage
and power factor.
4. High order harmonics filtering device:
1. Components: reactor, power capacitor, resistor (used when there is a high-passchannel), these three components shape a filtering channel. Multiple filtering
channels can be formed according to system requirements, which are used to filter
out corresponding high order harmonics, respectively.
2. Structure: The reactor is tubular dry type, with double coils at top and bottom,
natural cooling, the power capacitor is installed in a frame structure, with natural
cooling property.
3. Purpose: Remove the high order harmonics running through the system; supply capacitive
reactive power to the system and increase the power factor.4. Connection: Each filtering channel is connected to the bus of the system through switch
abinet (can also be connected directly).c
Technical parameters of SVC-- Static Var Compensator:
Item Specification
Voltage Level (kV) 6 10 27.5 35 66
TCR rated capacity (Mvar) 6-300
Structure of thyristor valve Standard frame structureCooling method of thyristor Heat pipe natural cooling or water cooling
Model of thyristor Electricity triggered thyristor (ETT) or
light
triggered thyristor (LTT )
Triggering method Photoelectricity triggered or light triggered
Control system DSP full digital control system
Control method Reactive power
Regulation scope of reactive power -100% - +100%
Regulation method Phase-splitting regulation
Response time of regulation system 20 years
Applications of SVC-- Static Var Compensator:
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RXPE SVC--Static VAR Compensator, regarded as the power quality solutions have
exceeded 600 sets, which are widely used in metallurgy, electric railway, electricity,
coal, nonferrous metals, and other industries.
RXPEs SVC/ Static VAR Compensator has been exported to Germany, Italy, India,
Turkey, Vietnam, Thailand, Myanmar, Nigeria, Sudan and other African countries, as
well as Brazil and other South American countries, just to name a few. And we have
provided SVC subcontract services to Italian Danieli and other international
engineering contractors.
I. Power Quality Solutions SVC Applications Metallurgy
1250 tons Hot rolling 10 kV SVC project of Qianan Steel in Tangshan China
The first LTT water cooling SVC in China
1. Project conditions: 1250 mm Hot rolling production line, the main motors are DC
motor
2.Time SVC takes effect: January, 2007
3. Operation results:
--The distortion of harmonic current and harmonic voltage is superior to national
standards;
--Voltage fluctuation is less than 1.0%;
--The unbalance of three-phase of voltage level is less than 0.5%;--Power factor is stabilized around 0.98.
4. Technical Specification
Technical data
Application 1250mm hot-rolling
voltage level 10KV
Model TCR+FC
TCR capacity 33 Mvar
Triggering method LTTStructure of valves framework structure
Cooling method water cooling
Control System Full digital control system
Response time of control system
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Baosteel 2050 Hot rolling 35 kV right bus bar SVC Reconstruction ProjectThe first LTT
SVC with large capacity in China
1. Reconstruction reasons: In Baosteel, the original SVC equipment of 2050 Hot rolling 35 kV
right bus bar is the whole set products of German Siemens in the 1980s, after operation over 20
years, the level of the equipment, technology, controlling precision and other aspects has behind
the times, and the components are aging increasingly, can not meet the needs of production of
Baosteel.
2. The transformation project: in this transformation, the photoelectric triggered valve was
replaced by the most advanced LTT silicon valve in the world, and substitute DSP full digital
control system for the original control system, the human-computer interface was much friendly,
and the monitoring system could supply more information to ensure the safety and stable
operation of SVC equipment.
3. Time RXPEs SVC takes effect: March 2007
4. Operation results: the power quality indicators were better than that of original SVC devices,
effectively balanced the reactive power, stabilized voltage and improved power quality.
5. Technical Data:
Technical Data
Applications 2050 Hot rolling
Voltage level 35kV
Model TCR+FC
TCR capacity 60 MvarTriggering method LTT
Valve structure framework structure
Cooling method Fully closed pure water cooling
Control system Full digital control system
Response time of the control system
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electrical network, limited voltage fluctuation of public connection points of power
grid, voltage flicker, voltage waveform distortion rate and value of harmonic current,
decreased the power consumption per ton and improved power factor.
4. Technical Data
Technical Data
Applications 1780mm hot strip mill
Voltage level 35kV
Model TCR+FC
TCR capacity 120Mvar
Triggering method photoelectric triggered
Valve structure framework structure
Cooling method High efficiency heat pipe cooling
Control system Full digital control system
Response time of the control system
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Cooling method High efficiency heat pipe cooling
Control system Full digital control system
Response time of the control system
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Degree of asymmetry of (negative
sequence) voltage
Seriously exceed
standard
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FC capacity 40Mvar
Filtering channel H3H5
Triggering method photoelectric trigger
Valve structure Open type, heat pipe natural cooling
Control system Full digital control system
Response time
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1. Project introduction: A 138/34.5 kV transformer and a set of 34.5 kV distribution
equipment supply power for a electric furnace, a LF furnace, in addition, another two
138/13.8 kV 37.5MVA transformer and a set of 13.8 kV distribution equipment
supply power for steelmaking, continuous casting, high-speed wire rod rolling mills.
2. Requirements of the client: Remove pollution to the power grid caused by
harmonic, reduce voltage distortion rate, improve the load bearing ability of power
system, purify and improve the power quality of the power grid.
3.Operation results: Improved the power quality of the power grid, eliminated
harmonics, reduced voltage distortion rate, and fully met requirements of the client.
Wide and thick plate project, 35 KV dynamic reactive power compensation
device SVC project of Wuyang Steel Company
1. Working conditions before RXPEs SVC takes effect: A 220 KV substations
mainly supply power for smelting loads, the smelting loads include a 100t
super-power electric arc furnace and two refining furnace. As large-capacity electric
furnace has features of short-circuit overload impulse, unbalance of three-phase,
harmonic, negative sequence and low power factor, etc., may cause serious impact on
power quality of the power grid, if do not administrate it, it would harm normal use of
other electrical loads in the power supply system.
2. Time RXPEs SVC takes effect: January 2008
3. Operation results of SVC: Effectively reduced the harmonic and negative sequence,restricted voltage fluctuation and voltage flicker, increased power factor and
improved power quality of the power grid.
4. Technical data:
Technical data
Applications 220kV Substation 100t EAF 120t LF
Voltage level 35kV
Model TCR+FC
TCR capacity 120 MvarTriggering method photoelectric trigger
Valves Structure framework structure
Cooling method high efficiency heat pipe cooling system
Control system Full digital control system
Response time of the control system
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conducting steel business over 50 years. On December 2007, the annual output of
downstream products of 14 associated steel enterprises in Thailand involved with it
has reached 14 million tons, and the market share of its products in Thailand has
exceeded 60%. As the percentage of non-linear loads in the system was large, the
quality of power supply was reduced. In order to improve the power factor, Thailand
Weichengfa inhibited the distortion of high order harmonic to the power grid, made
comprehensive administration in accordance with provisions of relevant standards of
power quality.
In March 2006, Thailand Weichengfa Wire Rod Factory came to visit our company,
made a full recognition to hardware facilities and software technology of our
company, and decided to use the FC device produced by RXPE to improve
performance, productivity of equipment .
The rated voltage of the project is 22 KV, filtering capacity is 9.35 Mvar.
2. Operation results: Since FC of RXPE has been put into operation in Thailand
Weichengfa, the equipment has been operated stably and in good conditions, the
power factor was improved, and the unbalance degree of voltage was also better than
national standard, reached the expected purpose, met the requirements of assessment
of the user and reduced operating costs of the enterprise.
II Power Quality Solutions - SVC - Application- Electric railway
Baotou-Lanzhou line substation SVC project
1. Project Overview: The main loads of Lanzhou Railway Bureau Baotou-Lanzhou
line traction substation are electric railway locomotives, the main transformer bus are
divided into two sections, an AFF33-2240-1W close type power capacitor is hung on
each section of bus, used to compensate reactive power of the locomotive, and
improve the power factor of the traction substation.
2. Time RXPEs SVC takes effect: May 2002
3. Functions of SVC
Functions of SVC
Eliminate inverted sent reactive power, and increase power factor
Before the SVC was put into operation, the original capacitor injected a large number
of reactive power to the system at the section under the condition that no locomotive
was running, the average power factor of the substation was 0.88; after the SVC was
put into operation, the problem of inverted sent reactive power was effectively solved,
the average power factor of the substation was increased above 0.92.
Restrict high order harmonic
The high order harmonic generated by the filtering device of SVC on the electric
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railway has good regulation function, particularly on the 3rd, 5th, 7th harmonic, the
administration effect is particularly evident. After SVC was put into operation, the
distortion rate of voltage of various order harmonics has not exceeded standards,
which meet operational requirements of the user.
Reduce the unbalance of voltage, decrease the negative sequence interference
After SVC was put into operation, it effectively improve voltage unbalance state, the
unbalance degree of voltage was reduced significantly, which was fully comply with
requirements of various standards.
Reduce the current impulse and voltage fluctuation caused by the locomotive, and
optimize power quality and enhance transport capacity
The real-time dynamic reactive power compensation performance of SVC, effectively
reduced the current impulse and voltage fluctuation caused by the locomotive, and
optimized the power quality, enhanced the transport capacity of electric railway.
4. Technical Data
Technical Data
Applications Traction substation of electric railway
Voltage level 27.5KV
Model TCR+FC
TCR capacity 3.6Mvar
FC capacity 4.8MvarFiltering channel H3
Triggering method Photoelectric trigger
Valve structure Open type, heat pipe natural cooling
Control system Double CPU full digital control system
Response time
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administration for compensation between electric railway and power grid in China.
2. Time RXPEs SVC takes effect: May 2002
3. Operation results:
Before SVC device was put into operation, because of the impact of negative
sequence current, the loads of two generators were restricted, the daily average output
per unit was down to 20,000 kilowatts per three hours. After SVC was installed and
put into operation, administration of units was no longer be restricted, could operate
with full load at any time according to scheduling requirements.
Name of
technical
specification SVC
Before SVC
put into
operation
Expected value of
feasible scheme
After SVC
put into
operation
Reduction
Voltage
fluctuation
4.7% 2.0% 1.5% 68.1%
Average power
factor
0.8-0.85 0.9 Over 0.97
4. Technical Data
Technical Data
Applications: 110kV regional power grid Triggering method: Photoelectric triggered
Voltage level: 35KV vertical Valve structure: heat pipe natural cooling
Model: TCR+FCControl system: Double CPU Full digital
control system
TCR capacity: 100Mvar Response time:
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Applications 220kV substation
Voltage level 35KV
Model TCR+FC
TCR capacity 120
Triggering method Photoelectric trigger
Valve structure Open type structure
Cooling method High efficiency heat pipe cooling
Control system Full digital control system
Response time of the control system
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Cooling method High efficiency heat pipe cooling
Control system Full digital control system
Response time of the control system
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accounting for 50% of coal reserves in East China, 74% of coal reserves of Anhui
Province, which is the sum of reserves of Shandong and Henan provinces, and
equivalent to 11 times of the reserves in Jiangxi Province. With 20 million tons/year
of coal production, it is a new enterprise taking the coal mining as its leading industry,
and integrating with coal, electricity and chemical.
2. Problems of the client: The winch in main well of the AC/AC frequency conversion
power supply, and the winch in vice well of thyristor converter DC power supply of
110 KV substation of Huainan Mining, is the main impulsive loads on section I, II of
the 10KV bus. The reactive impulse of the system is large, which causes a lot of
fluctuation to the power grid, resulting in extremely low power factor, the harmonic
current injected is also large, especially 5th, 7th, 11th is the most significant.
3. Time RXPEs SVC takes effect: September 2005
4. Operation results: Through tracking and measurement, performance of the
equipment is stable, with safe and reliable operation, good indicators, it effectively
solved above problems to loads of the user, achieved the expected results.
Typical project in coal mine industry
Huainan Mine Industry 110kV substation
1.Background: Huainan is located in Anhui province, total gross value over 10 billion
Yuan. Annual production is 20 million tons. Coal mine is the leading industry of
Huainan, and Coal electricity is auxiliary industry.
2. Customer problems: Main hoist and auxiliary hoist are main impact loads of 10kVbusbar and . The reactive power rush causes obvious voltage vibration and low
power factor to the grid, furthermore, the load brings abundant harmonic current to
the system, especially 5th, 7th, and 11th harmonics.
3. Operation date Sep. 2005
4. Operation benefitsAfter actual tests, the equipment operates safely and stably,
customs problems are solved completely.
Typical project in nonferrous metal industry
Yunnan Xinli Nonferrous Metal Company, 80000t/year high titanium slag project
1. Background: 80000t/year high titanium slag project is a key project of Yunnan
Metallurgy Group during 11th five-year period. The project adopts international
advanced technology, which play a active role in energy saving and environment
protection.
2. Customer problems: Harmonics and reactive power rush during DC EAF operation
will cause voltage vibration and flicker, which will influence safe operation of
electrical equipments in grid, and worsen the power quality.
3. Time RXPEs SVC takes effectDec. 2007
4. Operation benefits: Effectively eliminate harmonic current in grid, smooth voltage
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vibration, suppress voltage flicker, reduce production cost, and improve power factor.
V.Power Quality SeriesSVCApplication-Non-ferrous Metal
Industry
The 80,000 tons/year High Titanium Slag Project of Yunnan Xinli Non-ferrous Metal
Company
1. Project description: The 80,000 tons/year High Titanium Slag Project of Yunnan
Xinli Non-ferrous Metal Company, is the key project during the 11th Five-Year
Plan of China Yunnan Metallurgical Group, it firstly introduced high-power direct
current closed electrical furnace smelting high titanium slag technology in China,
which is at advanced level in the world, at the same time, it adopted the international
advanced raw materials preheating and exhaust new comprehensive recovery
technology, which has played a positive role for energy conservation and protection
of environment. The project is expected to invest 600 million, after it is put into
production and achieves standard, the capacity of output will be 80,000 tons of
chloride slag, 20,000 tons of acid slag and nearly 70,000 tons of pig iron, the annual
sales income will reach 470 million yuan, profit tax will reach 120 million yuan, it
will play a positive role to promote the resource advantages of Yunnan Province to
transfer into economic advantages, and drive development of local economy, enhance
the competitiveness of the metallurgical group.
2. Problems of the client: DC electric furnace generated a large number of harmoniccurrent, voltage fluctuation and flicker caused by reactive impulse in the process of
running, which seriously impacted on the safe operation of electrical equipment of the
power grid and the client itself, reduced power quality of the power supply grid.
3. Time to put into operation: December 2007
4. Operation results: Effectively restricted the harmonic current injected into the
power grid, restrained the voltage fluctuation, voltage flicker, reduced the power
consumption per ton, increased power factor, greatly improved efficiency of
steel-making of the electric furnace, shortened the steel-making time, at the same time
reduced the cost of steel making, which has played a positive role for energy
conservation and protection of environment.
SVC-Service Guide
Complete service
System Design
SVC Manufacture
Equipment Design and Civil Design
Mounting supervision
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Commissioning
Training
Spare Parts Supply
Maintenance
Remote Monitoring