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.

Power Quality Issues	Harm to Devices	Benefits after Management
Excessive reactive current	Reduced efficiency in power generation and transmission and a fine imposed by the Power Sector to related enterprises; Sharp decline in the utilization of input transformers and unnecessary increase in device costs and basic electricity payments	Ensure that system power factors meet national standards, thereby avoiding fines arising from a low power factor; Decrease in-house device power consumption, improve transformer utilization, and reduce electricity payments.
Excessive harmonic current	Voltage distortion generated on the power grid and inability to use related devices on the grid; Shorter device service life, e.g., unexpected heating, accelerated aging and reduced service life of a capacitor, and more seriously, capacitor bulging, breakdown or explosion	Improve power use safety and system reliability; Extend device service life and reduce device maintenance costs; Minimize the disturbance of harmonic current on precision instruments.
3-phase voltage unbalance	Improper running of devices on the unbalanced line, and more seriously, device failure	Enhance power supply quality of enterprise equipment, improve reliability in device operation, and reduce economic loss; Suppress neutral current and prevent overcurrent from damaging other lines.
Voltage sag	Unexpected shutdown of on-going manufacturing devices, product quality decline or production line hold-ups; Machinery damage and electrical device burnout, and more seriously, personal accidents; Sensitive-device data loss and huge economic loss	Ensure a continuous production line, and avoid possible productivity drop due to device shutdown; Optimize device power use quality, and ensure product quality; Extend service life of manufacturing equipment.

Applications

Power Quality Regulators in Modular Structure

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.

Power Quality Regulators in Modular Structure

Drawer style

Wall-mounted

Upright

2-Units wall mounted Power Quality Regulators in Modular Structure

2-Units drawer style

Integrated modular cabinet

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.

Power Quality Regulators in Modular Structure

At the dust-proof certification test

After the dust-proof certification test

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.

Power Quality Regulators in Modular Structure

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.

Power Quality Regulators in Modular Structure

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.

Advanced harmonic suppression technology: Quickly suppresses the harmonic state in less than 1s after a device detects that harmonic current is inevitable in the power grid, making sure that the device will not be turned off entirely so that it can go on performing compensation for the system.
Low ripple output: An interleaving-based low-ripple control technology achieves a smooth waveform even for a 60th harmonic output.

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.

Power Quality Regulators in Modular Structure

Harmonic current compensation by an APF

Inductive reactive-current compensation

Capacitive reactive-current compensation

Modular APF/ASVG/SVG Model

Power Quality Regulators in Modular Structure

APF Model for Quick Selection

Transformer Capacity (kVA)	APF Capacity (3-Phase 3-Wire)	APF Capacity (3-Phase 4-Wire)
1000	200A	300A
1250	300A	400A
1600	400A	500A
Remarks	1. For use in harsh environment, we recommend industry-specific cabinet-style products; 2. For use in scenarios where harmonic current and reactive current are excessively large, configure our products based on actual calculation or in-site test data.

Modular APF Parameters

Model	APF 20A	APF 35A	APF 50A	APF 100A	APF 125A	APF 150A
System Parameters
Grid voltage	400V (-40%‒+20%)
Grid frequency	50 Hz/60Hz (±10%)
Pieces to be integrated	No limit
Global efficiency	Up to 98%
Wiring mode	3-phase 3-wire/3-phase 4-wire
Heat loss	<2%
CT	150/5‒10000/5
Connection mode	Back connection/Top connection
Air in/out	Front to back/Top to bottom
Performance Indicators
Response time	<2ms
Harmonic compensation order	2‒51
Cooling mode	Intelligent air cooling
Noise indicator	<58dB
Fixing mode	Drawer style, wall-mounted style and upright style
Dimensions *(WDH mm)*	Drawer style: 44248590 Wall-mounted:44290485		Drawer style: 500590150 Wall-mounted:505175640 Upright: 170525590		Drawer style: 500590170 Wall-mounted: 505195640 Upright: 170525590
Net weight	20kg		35kg		45kg
Environment Parameters
Altitude	≤2000m, 2000m‒4000m de-rating
Operating temperature	-10℃‒+50℃ (>40℃, use upon de-rating)
Relative humidity	5%‒95%, non-condensing

ASVG/SVG Model for Quick Selection

Transformer Capacity (kVA)	CosФ
	<0.5	0.5‒0.6	0.6‒0.7	0.7‒0.8	0.8‒0.9
1000	550kvar	550kvar	450kvar	350kvar	200kvar
1250	600kvar	600kvar	550kvar	450kvar	235kvar
1600	800kvar	800kvar	700kvar	550kvar	300kvar
Remarks	1. For use in harsh environment, we recommend industry-specific cabinet-style products; 2. For use in scenarios where harmonic current and reactive current are excessively large, configure our products based on actual calculation or in-site test data.

Modular ASVG Parameters

Model	ASVG15kvar	ASVG25kvar	ASVG35kvar	ASVG50kvar	ASVG70kvar	ASVG100kvar
System Parameters
Grid voltage	400V (-40%‒+20%)
Grid frequency	50Hz/60Hz (±10%)
Pieces to be integrated	No limit
Efficiency	Up to 98%
Wiring mode	3-phase 3-wire/3-phase 4-wire
Heat loss	<2%
CT	150/5‒10000/5
Connection mode	Connect from the back/top
Air in/out	Front to back/Top to bottom
Performance Indicators
Global response time	<2ms
Harmonic compensation order	2‒23
Power factor	Adjustable from -1‒1
Cooling mode	Intelligent air cooling
Noise	<58dB
Fixing mode	Drawer style, wall-mounted style and upright style
Dimensions *(WDH mm)*	Drawer style: 44248590 Wall-mounted: 44290485		Drawer style: 500590150 Wall-mounted: 505175640 Upright: 170525590		Drawer style: 500590170 Wall-mounted: 505195640 Upright: 170525590
Net weight	20kg		35kg		45kg
Environment Parameters
Altitude	≤2000m; 2000m‒4000m de-rating
Operating temperature	-10℃‒+50℃ (>40℃, use upon de-rating)
Relative humidity	5%‒95%, non-condensing

*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

Model	SVG 15kvar	SVG 25kvar	SVG 35kvar	SVG 50kvar	SVG 70kvar	SVG100kvar
System Parameters
Grid voltage	400V (-40%‒+20%)
Grid frequency	50Hz/60Hz (±10%)
Pieces to be integrated	No limit
Efficiency	Up to 98%
Wiring mode	3-phase 3-wire/3-phase 4-wire
Heat loss	<2%
CT	150/5‒10000/5
Connection mode	Connect from the back/top
Air in/out	Front to back/Top to bottom
Performance Indicators
Global response time	<2ms
Power factor	Adjustable from -1‒1
Cooling mode	Intelligent air cooling
Noise	<58dB
Fixing mode	Drawer style, wall-mounted style and upright style
Dimension *(WDH mm)*	Drawer style: 44248590 Wall-mounted: 44290485		Drawer style: 500590150 Wall-mounted: 505175640 Upright: 170525590		Drawer style: 500590170 Wall-mounted: 505195640 Upright: 170525590
Net weight	20kg		35kg		45kg
Environment Parameters
Altitude	≤2000m, 2000m‒4000m de-rating
Operating temperature	-10℃‒+50℃ (>40℃, use upon de-rating)
Relative humidity	5%‒95%, non-condensing