Power Quality. Static Var Generator (SVG) SVG Wallmount & SVG Cabinet Mount

Transcription

1 Power Quality Static Var Generator (SVG) SVG Wallmount & SVG Cabinet Mount

2 INTRODUCTION Introduction to Power Factor Power factor is a measure of how effectively your electrical equipment converts electrical current into useful output power, such as heat, light or mechanical motion. Active Power (P): Is the power used by a device to produce useful work. It is expressed in Watt (W) or KiloWatt (kw). Reactive Power (Q): Is the power that does not produce work but is needed in an alternating-current transmission system to support the transfer of active power over the network by temporarily storing energy in inductive and capacitive elements. It is expressed in Var or Kilovar (kvar). Apparent Power (S): Is the power resulting by the vector sum of both the active and reactive power. It is expressed in Volt Amperes (VA) or KiloVolt Amperes (kva). S (kva)= P(kW) 2 +Q(kVAr) 2 Displacement Power Factor (cos φ): Is the cosine of angle between active and apparent power. When the DPF reaches unity, it means that all the fundamental current that flows through the electrical equipment produces work. This factor does not consider harmonic currents. P(kW) COS φ = P(kW) Q(kVAr) S (kva) Q(kVAr) Benefits of addressing low Power Factor Enables your business to lower its ongoing kva demand charges and/or reactive charges, saving your business money. Increased capacity available to serve actual working power requirements Higher and better quality voltage regulation Lower transmission and distribution losses in your electrical system Reduces the threat of operational downtime caused by the overloading of your electrical assets. Implications of low Power Factor Low power factor can lead to lower than normal voltages within a site and consequently present unreliable equipment performance. Many electricity network companies charge commercial and industrial customers when power factor falls below 0.95 Low power factor can lead to stressing of the internal electricity infrastructure. This may cause unnecessary overheating and equipment degeneration. Ignoring power factor issues can increase costs for new installations, because of the need to oversize cables, switchboards and other electrical equipment. 02 G.E.S GROUP - STATIC VAR GENERATOR (SVG)

3 A Revolutionary New Power Factor Control System INTRODUCTION Static Var Generator (SVG) Automatic power factor correction equipment is broadly applied in industry to ensure the electrical network is utilised to its best capacity. The usual form of such power factor correction is an automatic controller that monitors one incoming phase to a plant and switches banks of capacitors to try and maintain a target power factor. The problems with capacitor based automatic power factor correction are vast and varied. It is slow to react to load changes so the system is constantly in a state of over compensation or under compensation. In today s harmonic rich environments the capacitors suffer (even with harmonic blocking chokes), system resonance is a risk and the life expectancy of the system is reduced. Contactors regularly fail and overloaded capacitors leak and present a real fire risk. Sinexcel s SVG is an entirely new approach to power factor correction. The SVG utilises a high speed three level inverter that reacts to changes in reactive power, injecting corrective reactive power into the system. Full correction is made in ¾ of a cycle. This rapid response provides stable accurate real-time power factor correction without the draw backs of traditional capacitor based systems. SVG can continuously adjust reactive power dynamically and bi-directionally (-1 to +1). There is little chance of system resonance and even under low voltage conditions SVG will provide full reactive power compensation. Traditional two-level inverter circuit Innovative three -level inverter circuit SVG Operating Principal Sinexcel SVG checks the load current through the external CT, and performs computing through the external DSP to analyse the reactive content of the load current. After that, it controls the PWM signal generator based on the settings to send control signals to the internal IGBT. In this way, it generates reactive compensation current to implement dynamic reactive power compensation. Cos > 0.99 G.E.S GROUP - STATIC VAR GENERATOR (SVG) 03

4 PROS & CONS The Pros and Cons Conventional Capacitor System V Capacitor based systems are based on staging in and staging out banks of fixed capacitance. This means the amount of correction is available only in multiples of the fixed banks resulting in over and under compensation. New SVG The SVG uses inverter technology to inject an infinitely variable amount of corrective reactive power. This ensures the power factor is always at setpoint with no over or under correction. Capacitor based systems are slow to respond. The power factor controller must be tuned to stop cycling of the staging in and staging out process. The delay is further increased by the time taken for the bank contactor to pull in. The complete response time of the SVG is less than 15mS and the dynamic response time is less than 50uS. This makes the SVG perfect for sites with rapidly changing power factor. Capacitor based systems can encounter resonance. The SVG uses inverter technology so resonance is eliminated. Conventional systems can only correct an inductive (lagging) load. The SVG can correct both an inductive (lagging) or capacitive (leading) load. Conventional systems are manufactured by collectively installing blocking chokes, capacitors, and switching contactors into an enclosure. This takes up a large amount of switchroom real estate. The inverter technology used in the SVG is very compact and typically requires less mounting area than a conventional system. The performance of power factor correction capacitors is greatly impacted by the grid voltage level. Low voltage on the grid results in poorer compensation performance from the capacitors. The SVG performance is virtually unaffected by low grid voltage levels. Capacitor based systems require frequent switching of the stages to achieve correction for changing power factor thus resulting in a shortened service life, in some cases as low as 3 years. The SVG has low losses and needs little maintenance. The service life is expected to be greater than 10 years. 04 G.E.S GROUP - STATIC VAR GENERATOR (SVG)

5 SVG Performance PROS & CONS Quick Response The system reactive power compensation can be completed immediately, right at the startup of the Sinexcel SVG. Ideal Compensation Sinexcel SVG releases compensation current that has the same capacity - but an opposite phase, as system reactive current. Real-Time Tracking Sinexcel SVG can make dynamic and real-time compensation based on the changes of system reactive current. Reverse Overlapping After the compensation current is reversed in its direction, the system reactive current overlaps with the reactive current released by Sinexcel SVG. G.E.S GROUP - STATIC VAR GENERATOR (SVG) 05

6 FEATURES SVG Features Outstanding Reactive Power Compensation Compact Modular Design for Ultimate Flexibility 3 level topology Stepless Reactive power compensation: COSφ>0.99 Three-phase unbalance compensation Capacitive and inductive compensation: -1 to + 1 Stable and Quick Reactive Power Compensation Real-time compensation, with the overall response time less than 15 ms. Dynamic reaction time is less than 50µs. Free of over-compensation, undercompensation, and harmonic resonance. The compensation capacity is equal to the installed capacity and is not affected by voltage drop. Structural Dimensions Mix and match modules for optimum sizing Each module has all functions and can operate independently Wallmount and rackmount options Customizable cabinet designs Standardized design for high quality and reliability Easy to commission, use, transport, and maintain Combinations for any Industrial Condition SVG for reactive power compensation ASVG for reactive power compensation and limited harmonic compensation SVG+AHF reactive power compensation and harmonic compensation Long Service Life The designed service life is 100,000 hours, without any maintenance. MODEL DIMENSIONS (W X H X D) (MM) WEIGHT (KG) MODEL DIMENSIONS (W X H X D) (MM) WEIGHT (KG) sinexcel 030/050 SVG 44L/RL 500*192* sinexcel 050 SVG 44L/HL 500*585* sinexcel 100 SVG 44L/RL 500*270* G.E.S GROUP - STATIC VAR GENERATOR (SVG)

7 Technical Specifications 400V ITEM Sinexcel SVG 030 Sinexcel SVG 050 Sinexcel SVG 100 SPECIFICATIONS System Parameters Rated input line voltage 400V Input phase voltage range -40%~+20% Power grid frequency 50Hz/60Hz (range: 45Hz ~ 63Hz) Parallel operation Unlimited Overall efficiency >97% Power grid structure 3P3L/3P4L CT 150/5 ~ 10,000/5 Power grid structure 3P3L/3P4L Performance Indicators Single-module compensation capacity 30/50kvar 100kvar Response time <15ms Target power factor Adjustable from -1 to +1 Cooling mode Smart air cooling: 220L/sec Smart air cooling: 405L/sec Noise level per module <65dB Communications and Monitoring Capabilities Communications ports Communications protocols Alarm Monitoring RS485, CAN, and network port Modbus and PMBus Available Monitoring module, and optional centralized monitoring modules Mechanical Properties Mounting type Rack-mounted, wall-mounted, and cabinet Cabinet Cable entry mode Rear entry for rack-mounted type; top entry for wall-mounted type; top or bottom entry for cabinet Dimensions (W x D x H) (mm3) 500*590*192 (Rack-mounted) 500*585*197.1 (wall-mounted type) (cabinet) Module net weight 35kg 48kg Color True color of plate coated with aluminum-zinc alloy, and black for wall-mounted type (customizable) Environment Requirement Altitude 1500 m. Between 1500 m to 4000 m, according to GB/T3859.2, the power decreases by 1% for every additional 100 m. Operating temperature -10 ~ 40 ºC Relative humidity 5% ~ 95%, non-condensing Protection class IP20 (other IP classes are customizable.) G.E.S GROUP - STATIC VAR GENERATOR (SVG) 07

8 GES Group is the UK representative and distributor for the innovative Active Harmonic Filters and Static VAR Generators from the international market leader, Sinexcel. Sinexcel are one of the world s largest suppliers of Active Harmonic Filters and Static VAR Generators, and lead the field in performance and design. With a R&D Centre of more than 100 people, and a 14,500m2 manufacturing centre, Sinexcel is a high-tech enterprise, specialising in intelligent power quality and control technologies, and concentrating on delivery of high quality products. With a focus on excellent customer support and service, Sinexcel is a great fit with GES Group. Head Office Grants Electrical Services Pennybridge Industrial Estate Ballymena BT42 3HB Tel: info@grantselectrical.co.uk GES Automation Trade Counter Pennybridge Industrial Estate Ballymena BT42 3HB Tel: E: counter@grantselectrical.co.uk Grants Electrical Services, Mallusk Hyde Park Industrial Estate McKinney Road Mallusk BT36 4PX Tel: E: rmchugh@grantselectrical.co.uk GES Automation, Mallusk Trade Counter and Electric Panel Building Hyde Park Industrial Estate McKinney Road Mallusk BT36 4PX Tel: E: rdpaul@grantselectrical.co.uk