Static Reactive Power Compensation (SVC) Flexible AC Transmission Systemssvc Start

• Protection: Shock Resistance
• Installation: Vertical
• Housing: According to Drawing
• Capacity: 6-300mva
• Transport Package: Wooden Cases
• Specification: IEC CE, ISO
• Model NO.: SVC SVG
• Trademark: VILLE
• Origin: Ningbo China
• HS Code: 85
• Production Capacity: 5

Product Description

SVC & SVG Problem Solving

1.Electric Arc Furnace

Electric Arc Furnace is regarded as a nonlinear and erratic load, it will create a series of adverse effects to the
power grid, mainly including:

Serious three-phase unbalance of the power grid, negative sequence current.
High order harmonics, such as 24th even harmonics and 3rd, 5th, 7th odd harmonic, severe voltage distortion
becomes more complicated.
Serious voltage flicker. 
Low power factor

One of the methods to completely resolve above problems is to install a dynamic static reactive power
compensation device (SVC) with quick response speed, the response time of SVC system  is less than lOms.
The strict technical requirements is met, reactive current to electric arc furnace is provided, voltage level of bus
is stabilized, the output of the metallurgical active power is increased, and minimize the impact of flicker. The
isolated phase compensation function of SVC can eliminate the three-phase unbalance caused by electric arc
furnace, filtering devices, the harmful high order harmonics and improved power quality and power factor are
achieved through providing capacitive reactive power to the system.

2.Rolling Mill

The reactive power impulse caused by rolling mill and other industrial symmetry loads during working will
generate the following effects to the power grid:

Severe voltage level drop and voltage fluctuation make the electrical equipment inoperative, and reduce the
production efficiency.
Reduction of the power factor
Harmful high order harmonics in transmission device of load, mainly including odd harmonics, such as 5th, 7th,
11th, 13th and side frequency, which will lead to serious distortion of voltage level.

SVC can perfectly solve the aboved problems. A stable bus voltage is maintained, the harmonics is eliminated,
and the power factor is close to 1.

 3.Power supply of electric locomotive

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. SVC has solved the problems perfectly not only
technically but also economically with its excellent cost performance. 

4.Hoist and other heavy loads will have the following effects on power grids at work:

Voltage level drop and voltage fluctuation in the power grid. 
Low power factor
Harmful high order harmonics in transmission device

SVC can perfectly solve the problems.

 5.Long-distance power transmission

Global power currently trends to greater than power grid, long-distance transmission, high energy consumption.
At the same time, it also demands the transmission and distribution system to be more effective. SVC can
significantly improve the transmission and distribution performance of power system,  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:

Stabilization of the voltage of weak system
Reduction of the transmission losses
Increment of transmission capacity makes the existing power grid play its maximum efficiency
Increment of transient stability limit 
Increment of damping under small interference
Enhancement of voltage control and stability
Elimination of power flunctuation

6.Secondary substation in city (66/110 kV)

SVC system can quickly and accurately make capacitive and inductive reactive power compensation. When
SVC stabilize bus voltage and improve 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 effeciency with the least investment. It becomes the most effective way to improve the quality of power
supply of regional power grid.

Item	Specification
Voltage Level (kV)	6	10	27.5	35	66
TCR rated capacity (Mvar)	6-300
Structure of thyristor valve	Standard frame structure
Cooling 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	<10ms
Noise level	Natural cooling,without noise
Power supply voltage of auxiliary power grid	380V±15%
Service life	>20 years

Inductive Loads

1.Self-induction in a coil is called inductance
2.The obstacle in the coil is called inductive reactance
3.Reactance gets the current phase-shifted, lagging

Capacitive Loads

1.In capacitive circuits the current is phase-shifted for leading in comparison to the voltage
2.Capacitive power is produced from the capacitor
3.The obstacle in a capacitor is called capacitive reactance.

Active - Reactive Power
1.When voltage and current co-operates = active power (Watt) P
2.When voltage and current not co-operates = reactive power (VAr) Q
3.Reactive power does not perform any real work!!!

SVC Susceptance and Reactive Power
The SVC application consists of….

Power Transfomer

Thyristor Controlled Reactors

Thyristor Switched Capacitors

Harmonic Filters

Valve Hall

Control System - MACH 2

Cooling System

Thyristor Controlled Reactors
1.In inductive circuits the current is lagging,i.e. the reactor consumes reactive power. 
2.Since the reactor does not allow current rushes it is possible to control it with thyristorvalves at a firing angle between 90 -
   180 degrees.
3.A "chopping" of the current sinewave produces harmonics, however the 3rd harmonic and multiples of the 3rd harmonic can
   be trapped within the reactor by means of Delta connection.
 

Harmonics Generated by the TCR

sinus contains harmonics



A current or voltage for which the wave form deviates from pure

 If the voltage - time areas of the positive and negative half

cycles are of equal size and shape, then the wave form includes

only odd harmonics

 Thus harmonics of order 3,5,7,9,11...... will be generated by the

TCR

TCR - Harmonic Current vs Control Angle





 

Harmonic Filters

Will add capacitive power!

Harmonics are generated by unsymetrical loads of the current, typical producers of harmonics are the TCR and EAF (Electric

Arc Furnace).

A harmonic filter consists of capacitors (C) and a reactor (L), in some cases a resistor (R) is added.

The harmonic filter is tuned to the frequency to delete. It will create a impedance minimum which will short or

damp the harmonic.

A three-phase network will only consist of uneven harmonics 3, 5, 7 etc. They will be calculated from the base frequency 50 or 60Hz.

The SVC application consists of….

Valve Hall

The thyristor is a semiconductive switch, on or off. It will start to conduct after a firing pulse is received and it will

switch off when the voltage comes to zero.

Thyristors that are stacked in series formes a valve. The bus voltage is connected over the valve.

Thyristors are connected in anti-parallel to take care of both the positive and negative phase of the current.





 

Cooling System & Auxiliary

Thyristors will produce heat which must be transferred away or the thyristors will breake down.

Consists of a main circuit which circulates the water and a second circuit for water treatment.

 

Reactive Current Flows.....

Our Performance:

1.	Pre sale service
a.	make technical solution
b.	send quotation, technical data sheet and drawing
c.	prepare power transmission plan, testing plan,and shipment plan
2.	In sale service
a.	supervise the manufacturing schedule totally in accordance with the plan
b.	send photos to customer during every manufacturing process(hold point)
c.	inform the customer one week before testinng.
3.	After sale service
a.	installation and commissioning, training the workers
b.	quick response within 12 hours any time
c.	provide 12 months gurantee period normally.

FAQ For You

1. Q:	What is your delivery time ?
A:	Depend on the type of transformer.
2. Q:	What is your payment term?
A:	30% advance by T/T , 70% before delivery by T/T or L/C or we can discuss about it.
3. Q:	What kind of starndard you follow?
A:	IEC, ANSI, CSA, GB, etc
4. Q:	What kind of supporting documentation you can provide normally
A:	Quotation,outline drawing,manufacturing plan, quality control plan testing plan, financial report, type test report(KEMA, CESI),reference list,etc
5. Q:	What is your normal wanrranty period?
A:	12 months after transformer operation.
6. Q:	Can u do installation and commissioningin user's site?
A:	Yes, we can send our installation team to user's country for service.
7. Q:	Do you have any experience in this kind of transformer?
A:	Yes, we can provide reference list for check.
8. Q:	Are you manufacturer or trading company?
A:	Manufacturer and Trading company.

Quality Assurance
--From the very beginning, VILLE ensures quality in every step to achieve the best quality.
 Experience Sharing
--With more than 30 years' experience in power industry, VILLE brings you an optimized solution.
 Global Service
--Wherever you are, VILLE global network will support and provide you with value.
 Quick Response
--In response to your needs without delay, VILLE  knows the value of your time.

Ville Electric Company will keep up with the century, the epoch,

Sincerely look forward to your cooperation and win-win!

Create brilliant!