STDG200系列低压静止无功发生器模块及装置（SVG） 

STDG200 Series Low Voltage Static Reactive Generator Module and Device (SVG)

● 按照行业：汽车制造（焊接、冲压）、治金（压延、轧钢、冶炼、行吊）、港口码头、
石油化工、有色（压延、冶炼）、电力、矿山、煤化工、军工、轻工（食品加工、烟草、
制药、制糖等）机械制造（焊接）、公共设施（升降类）、市政、轨道交通、污水处理等。
● 按照工况：各种无功需求场合，尤其针对无规律快速变化、具冲击性、三相不
平衡负荷。压延（可逆轧机、热轧与冷轧）、中频源（冶炼或结晶）、直流加热炉、
电弧炉、行吊、焊机、冲床、提升机、升降台、缆车、密炼机、冲压机、轧机、锻造、
纺织机变频、低压大电流整流器等谐波含量丰富的一类负载。

性能特点   Performance Characteristics

● According to the industry: automobile manufacturing (welding, stamping), metallurgy (calendering, rolling, smelting, crane), port terminal,
Petrochemical, non-ferrous (calendering, smelting), electricity, mining, coal chemical, military, light industry (food processing, tobacco,
Pharmaceutical, sugar, etc.) mechanical manufacturing (welding), public facilities (lifting), municipal, rail transit, sewage treatment, etc.
● According to working conditions: various reactive demand occasions, especially for irregular rapid changes, impact, three-phase
Balance the load. Calendering (reversible rolling mill, hot rolling and cold rolling), intermediate frequency source (smelting or crystallization), DC heating furnace,
Electric arc furnace, row crane, welding machine, punching machine, hoist, lifting platform, cable car, internal mixer, punching machine, rolling mill, forging,
A class of loads with rich harmonic content such as frequency conversion, low-voltage and high-current rectifiers.

工作原理 

Working Principle

随着电力电子技术的发展，各种非线性和时变性电子装置大规模使用，供电系统的要求越来越高，传统常用的并联电容器补偿方式已无法满足一些冲击性负荷的配电系统（诸如焊机、轧机、密炼机等）治理的要求。作为柔性交流输电系统 FACTS的核心设备和技术之一，静止无功发生器（SVG： Static Var Generator）应用于配电系统的无功补偿，可实现从感性到容性的连续、快速无功调节，有效抑制电压波动与系统振荡，改善负荷三相不平衡，滤除谐波电流的干扰，增强系统稳定性等。

With the development of power electronics technology, various non-linear and time-varying electronic devices are used on a large scale, and the requirements of power supply systems are getting higher and higher. Traditionally used parallel capacitor compensation methods have been unable to meet some impact load distribution systems (such as Welding machine, rolling mill, internal mixer, etc.) requirements for treatment. As one of the core equipments and technologies of the flexible AC transmission system FACTS, Static Var Generator (SVG) is applied to the reactive power compensation of the power distribution system to achieve continuous and fast reactive power regulation from inductive to capacitive. It effectively suppresses voltage fluctuations and system oscillations, improves load three-phase unbalance, filters out harmonic current interference, and enhances system stability. It is the best solution in the field of reactive power control.

STDG200系列静止无功发生装置的基本原理。将系统看作一个电压源，SVG看作一个可控电压源，后者采用可关断电力电子器件（IGBT）组成自换相桥式电路，经过电抗器并联在电网上，通过调节其交流侧输出电压的幅值和相位，或者直接控制其交流侧电流，迅速吸收或者发出所需要的无功功率，实现快速动态调节无功的目的。

The basic principle of the STDG200 series static reactive power generation device. Considering the system as a voltage source, the SVG is seen as a controllable voltage source, which uses a turn-off power electronics (IGBT) to form a self-commutated bridge circuit, which is connected in parallel to the grid via a reactor, by adjusting its AC side. The amplitude and phase of the output voltage, or directly control the current on the AC side, quickly absorb or emit the required reactive power, achieving the purpose of rapid dynamic adjustment of reactive power.

主要应用   Application

功能完善的智能操作系统

Full-featured intelligent operating system

● 采用新型7寸液晶屏的智能操作单元，界面友好，操作简单方便，
● 显示界面实时显示电网电压、SVG电流负载电流和网侧各次谐波电流的波形及频谱；
● 实时故障记录和信息查询。

● Intelligent operation unit with the latest 7-inch LCD screen, friendly interface and simple and convenient operation.
● The display interface displays the waveform and spectrum of the grid voltage, SVG current load current and the harmonic current of the grid side in real time.
● Real-time fault record and information query.

● Adopting the latest international control theory and world-class quality equipment;

● Fast response, dynamic response time is less than 5ms;
● Bidirectional dynamic linear reactive power regulation from inductive to capacitive;

● Stable to suppress voltage fluctuations, flicker and system oscillations, stabilize system voltage, and make system operation more stable;

● With filtering function, it can filter out 2-50 harmonics;
● Single-phase, three-phase dynamic adjustment, balance the single-phase three-phase active output of the system, and suppress the negative sequence component of the power grid.
● Single-phase and three-phase adjustment, the power factor can be increased to approximately 1.0;

● With three-phase unbalance adjustment function, the adjustment effect is good;
● SVG does not resonate with system impedance during operation, and has higher security;

● With system overvoltage, undervoltage protection, output overcurrent protection, control integrated protection and other functions;
● MTBF (mean time between failures): ≥100,000 hours;
● Simple design and selection, simple installation, operation and maintenance, SVG module can be extended in parallel operation;
● With communication function, with 485 communication interface (support GPRS / WIFI wireless communication mode).