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Power Solution for High-voltage Static VAR Generator (SVG)

Abstract:
Compared with traditional SVC such as modulator, capacitor reactor and thyristor controlled reactor (TCR), SVG is the best solution in the reactive power control field at present and has unparalleled advantages. In other words, SVG is currently the most advanced dynamic reactive power compensation device all over the world. MORNSUN PV45-29D1515-15 power supply for SVG's core power unit provides a highly reliable power solution to meet the customers’ demands.

Key Words:
SVG, power unit, IGBT, high isolation, PV45

SVG stands for Static VAR (Volt-Ampere Reactive) Generator. It is also known as high-voltage dynamic reactive power compensation device and static synchronous compensator, which performs dynamic reactive power compensation by a self-commutated power semiconductor bridge inverter. 

 I. Applications of high-voltage SVG:
High-voltage SVG is suitable for many applications shown as below, such as PV solar, wind, railway, drilling platform, mill, hoist and electric arc furnace (EAF), etc. The market of high-voltage SVG (6KV/10KV/35KV) is promising and prospective.

In power system, the reactive load not only increases the active energy loss of the power grid, but also seriously affects the quality of it. Real-time fast SVG is significant to improve the utilization ratio of power equipment and the stability of operation and ensure the power supply voltage within allowance. 

II. Basic structure of high-voltage SVG:
High-voltage SVG generally consists of control cabinets, power cabinets and starting cabinets. And power cabinets consist of multiple power units in which MORNSUN PV45-29D1515-15 used and play a key role in transmitting reactive power. Because power units are mainly composed of power supply (such as PV45-29D1515-15), power unit board, IGBT driver, film capacitor, surge absorption capacitor and heat dissipation device. 

III. SVG Application of PV45-29D1515-15:
High-voltage SVG usually adopts the chain structure by using multiple H-bridges in series.   and then power power supply in power units. Therefore, the grid voltage actually determines the number of required power supplies. PV45-29D1515-15 directly gets power through the grid as diagram 4 below, removing from problems of unstable supplies’ voltages or troubles of adding external components. Therefore, it enhances the reliability and safety of the system. 

   
For example, the fluctuating grid voltage in each H-bridge is 500V-1100V regarding 35KV bus bar. It’s recommended to use one PV45-29D1515-15 for every H-bridge to power two IGBT drivers respectively, totally four IGBT power tubes, due to its double 15V outputs.

VI. About PV45-29D1515-15
PV45-29D1515-15 is specialized for high-voltage SVG and offers 10:1 ultra-wide input voltage range of 150VDC-1500VDC, 4000VAC isolation and double outputs. It meets Industrial grade operating temperature of -40℃ to +85℃, 5000m altitude requirements and ±2KV/4KV surge protection. And it has high voltage accuracy and excellent load regulation and cross regulation, solving the problem of load imbalance caused by double outputs. Moreover, its built-in multiple protections ensure the safety of load and the module itself under abnormal condition. 

Features:
● 10:1 ultra-wide input voltage range: 150 - 1500VDC
● Industrial grade operating temperature: -40℃ to +85℃
● High isolation voltage: 4000VAC
● High efficiency, low ripple & noise
● Meet 5000m altitude requirements
● ±2KV/4KV surge protection (level four)
● Double outputs with excellent cross regulation
● Input under-voltage, reverse voltage, output short-circuit, over-current and over-voltage protections

To sum up, MORNSUN PV45-29D1515-15 specialized for high-voltage SVG features extremely high performance, taking into account industry specifications and simplified customers’ design and resulting in a long-term stability and reliability of the system.