Power Quality Regulators in Modular Structure

About Power Quality

As the Internet of Things (IoT) and Intelligent Manufacturing (IM) develops, an increasing number of non-linear loads such as variable frequency drives (VFDs), servo VFDs, and high-frequency power devices are applied. This inevitably poses a negative impact on the power grid, such as transient shock, high-frequency harmonic current, reactive current and 3-phase voltage unbalance.

Applications

Introduction to Modular Power Quality Regulators

Our modular power quality products include: Static Var Generators (SVGs), Advanced SVGs (ASVGs) and Active Power Filters (APFs). They have features such as high power density, enhanced reliability, optimized performance, high utilization and unique designs. For use in different application scenarios, there are three way to install them: drawer style, wall-mounted style and upright style.

Main Features of Modular Power Quality Regulators

Our modular power quality regulators:

• Are compact, with a maximum size of only 0.05m³, have a high power density, and apply to a variety of scenarios. In practice, they are more applicable to places where limited space poses a stringent requirement on the ground they could cover, as well as power distribution upgrading projects.
• Employ the same design concepts as industry-grade products, and therefore, highly adaptable to the environment.
• Furnish the module control layer with a board compartment that reaches a dust-proof rating of IP6X and has withstood the nationally recognized third-party lab testing.
• Apply an interleaving control manner at the output end. This reduces at least 40% of global ripple current.
• Support a dynamic response at ms level, with a global response time less than 2ms. Therefore, they can accurately track how transient current changes in the power grid and prevent over-compensation and under-compensation.
• Employ an industry-leading redundant design based on Insulated Gate Bipolar Transistors (IGBTs). As a result, failure in one line will not affect the proper running of the system.
• Allow devices to detach from the power grid in case of a breakdown, with no port capacitors remain connected to the grid, thus preventing any negative impact on the harmonic oscillator and capacitive reactive power of the grid.
• Support a CT connecting at the power supply side or the load side, which you can adjust according to on-site requirements.
• Have a fast and thorough fault self-diagnosis function, which can be intelligently adjusted based on actual operating conditions and states.
• Make it easier to maintain by using separately removable parts such as bus capacitor and fan.
• Support a smart algorithm, which automatically adjusts the compensation proportion based on real-time changes in reactive current and harmonic current, and also supports flexibly setting a compensation goal, in order to optimize your business objective.
• Support smart sleep in which two parallel systems apply a polling mechanism to allocate an average worktime for each module under a light load condition, thus extending module lifetime.
• Have passed the CE certification and conform to EN 62477-1: 2012+A11-2014+A1-2017 standard;
• Each of our products has the following compensation feature:
• An APF supports a wider range of compensation, that is, instantaneous 2nd‒51st harmonic compensation;
• An ASVG supports 2nd‒23rd harmonic compensation. You can set harmonic compensation capacity and reactive compensation capacity globally.
• An SVG supports global, instantaneous compensation for inductive reactive power and capacitive reactive power, and meanwhile, solves the three phase unbalance problem.

Enhanced Reliability & Performance

Industry-first dust-proof module at the control layer: The control section is separated from the power section. The control layer applies a fully closed dust-proof design, with no vent holes at two sides, front and back, thus obtaining an excellent sealing; while at the air cooling layer, critical power units are cooled by the power layer, thus achieving a superior device cooling performance. In addition, the control layer reaches a protection class of IP6X and has withstood the third-party lab testing. This isolates the control section from being polluted by the outer world. Besides, we employ an industry-grade hardware design, which further improves security and reliability.

Use of a separate control scheme for each IGBT, which is much more reliable because: each IGBT is equipped with a set of drives and a hall element, and in the case that the IGBT on one side fails, the device still could offer 50% of the rated output capacity.

Providing a soft-start relay and resistor between a filter capacitor and the power grid, to ensure that when a device fails, the filter capacitor breaks away from the grid, without posing any secondary impact on the grid.

Quicker response: Use of a Second-Order Generalized Integration (SOGI) algorithm achieves a global response time of less than 2ms, making it possible to accurately tract how harmonic content and reactive content change in the power grid and prevent over-compensation and under-compensation.

In the response test of a sudden load rise, the oscillometer record shows that the global response time on the display is 1.36ms.

In the response test of a sudden load drop, the oscillometer record shows that the global response time on the display is 1.96ms. 

How Modular Power Quality Regulators (APF/ASVG/SVG) Work

Our modular power quality regulators are connected in parallel on the power grid. By using an external CT to detect in real-time the load current on the grid, with the help of DSP/FPGA/CPLD chips, and in cooperation with the latest harmonic/reactive-component extraction technology, our regulators quickly obtain the harmonic or reactive content in the load current upon analysis, then generate PWM pulses based on the value that has been set, drive the bi-directional converter made up of three-level IGBT modules, and generate a compensation current that meets the grid requirement. Finally, they realize dynamic, precise compensation for harmonic or reactive current and improve the quality in power supplying.

Harmonic current compensation by an APF

Modular APF/ASVG/SVG Model

APF Model for Quick Selection

Modular APF Parameters

ASVG/SVG Model for Quick Selection

Modular ASVG Parameters

*Allocating rated power for compensation: You can select a proportion of the global rated power based on your settings to compensate for harmonic current and reactive current.

100% indicates that all of the global rated power is used for harmonics compensation.

Modular SVG Parameters

APF20A, 35A-LCD in Drawer-style Structure

ASVG/SVG15kvar, 25kvar-LCD in Drawer-style Structure

APF20A, 35A-LED in Drawer-style Structure

ASVG/SVG15kvar, 25kvar-LED in Drawer-style Structure

 

APF50A, 100A-LCD in Drawer-style Structure

ASVG/SVG35kvar, 50kvar, 70kvar-LCD in Drawer-style Structure

APF50A, 100A-LED in Drawer-style Structure

ASVG/SVG35kvar, 50kvar, 70kvar-LED in Drawer-style Structure

APF125A, 150A-LCD in Drawer-style Structure

ASVG/SVG100kvar-LCD in Drawer-style Structur

 

APF125A, 150A-LED in Drawer-style Structure

ASVG/SVG100kvar-LED in Drawer-style Structure

APF20A, 35A in Wall-mounted Structure

ASVG/SVG15kvar, 25kvar in Wall-mounted Structure

APF50A, 100A in Wall-mounted Structure

ASVG/SVG35kvar, 50kvar, 70kvar in Wall-mounted Structure

APF125A, 150A in Wall-mounted Structure

ASVG/SVG100kvar in Wall-mounted Structure

APF50A, 100A, 125A, 150A in Upright Structure

ASVG/SVG35kvar, 50kvar, 70kvar, 100kvar in Upright Structure

Modular Structure of SVGs&APFs in Drawer-style Cabinet

Modular Structure of SVGs&APFs in Upright Cabinet