Xinyuhua's Ac Dc Power Rectifier

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I. Theoretical derivation
1.6 pulse rectifier principle:
6 pulse refers to the full bridge rectifier composed of 6 thyristors (thyristors), because there are 6 switching pulses to control 6 thyristors respectively, so it is called 6 pulse rectifier.






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When ignoring the three-phase bridge thyristor commutation process and current pulsation, assuming that the AC side reactance is zero, the DC inductance is infinite, and the delay triggering Angle a is zero, the Fourier series expansion of the AC side current is:


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(1, 1)







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It can be concluded from the formula (1-1) that:
Does the current contain 6K? 1 (k is a positive integer) subharmonics, i.e. 5, 7, 11, 13... The effective value of each harmonic is inversely proportional to the harmonic number, and the ratio of the effective value of the fundamental wave is the reciprocal of the harmonic number.

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Figure 1.1 Input voltage and current waveform of 6-pulse A-phase simulated by computer






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2. Principle of 12-pulse rectifier:
12 pulse refers to the original 6 pulse rectifier on the basis of the input end, increase the phase shift transformer after adding a group of 6 pulse rectifier, so that the DC bus current is completed by 12 thyristor rectifier, so it is also called 12 pulse rectifier.
As shown in the following figure, the two three-phase rectifier circuits I and II constitute a 12-phase rectifier circuit through different connections of the transformer.

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Schematic diagram of 12 pulse rectifier (composed of 2 6 pulses in parallel)






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(1-2)



The Fourier series expansion of the network side current of Bridge 1 is















(1-3)



Bridge II network side line voltage is 30 ahead of bridge I? , because the side line current of the network is 30?















(1-4)



The resultant side current of the network








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Visible, two rectification Bridges produce 5, 7, 17, 19,... Subharmonics cancel each other, and only 12k is injected into the grid? 1 (k is a positive integer) harmonic, that is, 11, 13, 23, 25 and other harmonics, and its effective value is inversely proportional to the harmonic number, and the ratio of the fundamental wave effective value is the reciprocal of the harmonic number.
FIG. 1.2 Input voltage and current waveform of A phase of 12-pulse UPS simulated by computer






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2. Analysis of measured data.
The above calculation is the ideal state, ignoring many factors, such as commutation process, DC side current pulsation, trigger delay Angle, AC side reactance and so on. Therefore, there are some differences between the measured value and the calculated value. Theoretical harmonic calculation table:






Harmonic number
5th
7th
11th
13th
17th
19th
23th


6 Pulse harmonic content
20%
14%
9%
8%
6%
5%
4%


12 Pulse harmonic content
0%
0%
9%
8%
0%
0%
4%






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A model of high-power UPS harmonic measurement data table:






Harmonic frequency
5th
7th
11th
13th
17th
19th
23th


6 Pulse harmonic content
32%
3%
8%
3%
4%
2%
2%


12 Pulse harmonic content
1%
1%
9%
4%
1%
1%
2%




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From the above two tables, it can be seen that the harmonic content of the 6-pulse rectifier is up to 5 harmonics, and the intensity of the 12-pulse rectifier is up to 11 harmonics, which is consistent with the theoretical calculation results. The measured value of the 5th harmonics of the 6-pulse rectifier is larger than the calculated value, and the measured value of the 11th harmonics of the 12-pulse rectifier is the same as the calculated value



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Third, harmonic analysis and improvement countermeasures

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Harmonics may cause distribution cable, transformer heating, reduce the quality of talk, air switch misoperation, generator surge and other adverse consequences; Harmonics are divided into + sequence (3k+1 times, k is 0 and a positive integer), -sequence (3k+2 times, k is 0 and a positive integer), 0 sequence (3k times, k is a positive integer).

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+ sequence current makes the loss worse, -sequence current makes the motor reverse and heat up, and 0 sequence current makes the center line current increase abnormally.



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From the measured value can be seen, the 6-pulse rectifier 5 harmonic maximum, can be installed 5 filters to suppress harmonics; The 12-pulse rectifier has the largest 11 harmonics, and can add 11 filters to suppress harmonics. The principle diagram of the filter is as follows:


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Figure: A common LC filter schematic



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The harmonic comparison table of a certain type of high-power UPS after installing the filter is as follows:






Harmonic frequency
3th
5th
7th
11th
13th
17th
19th
Total


IEC6000-3-4 Indicator requirements
21.6%
10.7%
7.2%
3.1%
2%
1.2%
1.1%
25%


6 Pulse harmonic content

32%
3%
8%
3%
4%
2%
> 30%


6-pulse rectifier + 5-pass filter

2%
1%
7%
2%
3%
2%
9%


12 Pulse harmonic content

1%
1%
9%
4%
1%
1%
10%


12-pulse rectifier + 11-pass filter

1%
1%
3%
2%
1%
1%
4.5%




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As can be seen from the above table, the addition of filters has a very obvious effect on harmonic suppression.



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In particular, it should be pointed out that: The configuration of 6 pulse +5 harmonic filter can reach the harmonic requirements of about 9%, but because the capacitance of the 5 harmonic (250Hz) filter is larger, when the UPS load is light (<15% rated load), the rectifier input current will be ahead of the input voltage, if the generator excitation winding is self-excited, it is easy to produce armature positive feedback effect, The output voltage of the generator will rise abnormally, resulting in the generator entering the protection state and stopping. Therefore, the 6 pulse +5 harmonic filter scheme is not recommended for use when the UPS load is light. When the actual load is light, the 5th harmonic filter can be removed from the rectifier.

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The single 12-pulse rectifier can also reach about 10% of the current harmonic index, but there is no large capacitor LC circuit, to avoid the positive feedback effect with the generator excitation.
The current harmonic index of less than 4.5% can be achieved by using 12 pulse rectifier +11 harmonic device. The single harmonics and total harmonics content meet the index requirements of IEC61000-3-4.

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Schedule 1: Input current harmonic content data under different load conditions

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Input the total harmonic content
No-load
25% load
50% load
>75% load


6 Pulses
86%
65%
50%
> 30%


6 pulse +5 pass filter
> 50%
30%
15-20%
10-12%


12 pulses
20%
15%
12%
9.5%


12 pulse + 11-pass filter
12 ~ 15%
8 ~12%
5 ~ 8%
4.5%




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Schedule 2: Table of the total harmonic content of the input current of a 400KVA 12-pulse + 11-pass filter UPS of a certain model







Load percentage



Battery harmonic component THDI%



Total harmonic current absolute value




100%
4.5%
33A


75%
5%
28A


50%
8%
29A


40%
10%
29A


30%
12%
27A






It is the absolute value of harmonic current that affects the grid, not the percentage of harmonic current. As can be seen from the table above, the absolute value of harmonic current is the largest at full load; In the case of half load and light load, the absolute value of harmonic current does not exceed 100% of the absolute value of full load harmonic current. 12 pulse +11 harmonic filter has the minimum effect of the input current total harmonics, but also can avoid active filter "error compensation", low system efficiency shortcomings, because 12 pulse +11 harmonic filter the lowest pollution of the power grid, suitable for use in occasions with high reliability requirements.



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Fourth, performance comparison:

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Project
6-pulse rectifier + 5-pass filter
12 pulse rectifier +11 degree filter
Technical advantages of 12-pulse rectifier + 11-pass filter


1, the input current harmonic content radiated to the power grid
く10%
く4.5%
Due to the introduction of rectifier filter load into the mains power grid will cause the grid to be "polluted", resulting in a large number of high order harmonic current flowing through the whole power supply system. For this reason, it will cause the current flowing through the center line to overcurrent and the motor load abnormal heating. In order to solve the above problems, it is recommended to configure 12 pulse rectifier and 11 harmonic filter, so as to ensure that the power supply quality of the user's grid reaches the "green power supply" standard.


2. Energy consumption
Larger
Smaller
The input current radiated to the power grid has a small harmonic content
High order harmonics will cause heating loss on the input power transformer and cable, resulting in energy waste.


3. Generator down
easy
Will not
The positive feedback effect of the field windings is avoided


4. Cause switch misoperation
easy
Not easy



5. The UPS front end needs generator capacity
Large, according to 1.6~2 times the capacity of the generator configuration
Smaller, according to 1.5 to 1.8 times the capacity of the generator configuration
6 Pulse rectifier UPS needs more than 1.8 times the oil engine capacity
12 Pulse rectifiers require only 1.5 times the oil engine capacity


6. UPS input switch, cable capacity configuration
Add
No increase
Due to the large peak current of the 6 pulse rectifier input, transformers, circuit breakers, cables, etc., need to be derated, resulting in increased investment costs.


7. Rectifier output ripple voltage
Larger
50% lower
The ripple of the DC voltage output of the 12-pulse rectifier is 50% of that of the 6-pulse, which greatly reduces the ripple effect of the battery when charging, and can effectively extend the life of the battery.




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As can be seen from the table above, 12-pulse rectifiers are superior to 6-pulse rectifiers in a number of performance indicators. 12 pulse rectifier technology was born since the 1970s, after continuous improvement and improvement, has gradually become the preferred technology of high-power rectifier.

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Finally, as mentioned above, in the case of sufficient investment, try to choose the configuration of 12-pulse rectifier and 11-time filter. This configuration to meet the Ministry of information industry power supply industry standard input current harmonic component Class I requirements (YD/T1095-2000) and the International Electrotechnical Commission IEC61000-3-4 index requirements.

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Definition of Hybrid Energy SystemsHybrid energy systems are designed to harness the strengths of multiple renewable energy sources, providing a more stable and reliable power supply. These systems often include solar panels, wind turbines, and sometimes battery storage, allowing for multiple energy sources to work together seamlessly.

Importance of Wind Power InvertersWind power inverters are essential in hybrid energy systems as they convert the variable voltage and frequency of wind turbine output into a consistent form of power that can be easily integrated into the grid or used by other components in the system. This ensures that the energy generated by wind turbines can be effectively stored, distributed, and utilized.

Understanding Wind Power InvertersWhat is a Wind Power Inverter?A wind power inverter is an electronic device that converts the variable alternating current (AC) power produced by wind turbines into a stable direct current (DC) power that can be easily stored or converted back to a more usable AC form. This conversion is critical for maintaining a consistent energy supply in hybrid systems.

Key Components and FunctionsWind power inverters consist of several key components, each serving a specific function:
- Rectifier: Converts AC power from the wind turbine into DC power.
- Converter: Modulates the DC power to the desired voltage or frequency.
- Inverter: Converts the DC power back into AC power, typically with improved stability and control.
- Controller: Monitors and adjusts the inverter's performance, ensuring optimal operation.

Role of Wind Power Inverters in Hybrid Energy SystemsIntegration with Solar SystemsIntegrating wind power inverters with solar systems can enhance the overall efficiency and reliability of hybrid energy systems. By combining both direct and indirect current systems, these devices ensure a consistent supply of power, regardless of the time of day or weather conditions.

Technological Advancements in Wind Power InvertersRecent advancements in wind power inverter technology have improved their functionality and efficiency. These advancements include:
- Higher Efficiency: Modern inverters are designed to convert energy with minimal loss, improving overall system performance.
- Smart Grid Integration: Inverters can communicate with smart grid systems, optimizing energy distribution and storage.
- Advanced Controls: Enhanced control systems allow for real-time monitoring and adjustments, ensuring optimal performance under varying conditions.

Xinyuhua Wind Power InverterOverview of Xinyuhua InverterXinyuhua wind power inverters are known for their reliability, efficiency, and advanced features, making them a preferred choice for hybrid energy systems. These inverters are designed to provide stable power output, even under fluctuating energy conditions.

Technical SpecificationsAdvantages and BenefitsHigh Efficiency: Xinyuhua inverters deliver high conversion efficiency, ensuring minimal energy loss.Reliability: Robust design and advanced protection features make these inverters highly reliable, even in challenging conditions.Scalability: Capable of handling power ranges from small residential systems to large commercial and industrial applications.Smart Controls: Integrated smart control systems allow for real-time monitoring and adjustments, improving overall system performance.Best Practices and Case StudiesReal-World ApplicationsXinyuhua wind power inverters have been successfully integrated into various hybrid energy systems, demonstrating their effectiveness and reliability in real-world conditions. These systems have achieved significant improvements in energy efficiency and reduced operational costs.

Performance Data and TestimonialsSystem Efficiency: Hybrid systems incorporating Xinyuhua inverters have shown improved overall efficiency, with energy losses reduced to a minimum.User Testimonials: End-users and system integrators have reported high satisfaction with the performance and reliability of Xinyuhua wind power inverters.Maintenance: The advanced design and robust construction of Xinyuhua inverters significantly reduce the need for maintenance, enhancing system uptime and reliability.ConclusionSummary of Key PointsThe role of wind power inverters in hybrid energy systems is crucial for maintaining a stable and efficient power supply. Xinyuhua wind power inverters stand out for their high efficiency, reliability, and advanced features, making them an ideal choice for hybrid energy integration.

Future OutlookAs hybrid energy systems continue to evolve, the role of wind power inverters will become even more critical. Advances in technology and ongoing improvements in efficiency will further enhance the performance and reliability of these systems.

Off-grid power inverters play a crucial role in converting the direct current (DC) derived from a solar panel, battery, or generator into alternating current (AC) that can be used in our everyday appliances and systems. This article will delve into the working principle of off-grid power inverters and explore the different types available, with a particular focus on the "Xinyuhua pure sine wave inverter 3000W."

IntroductionAn off-grid power inverter is a device designed to convert the DC power stored in batteries or generated by solar panels into AC power. This conversion is essential because most household appliances require AC power to operate. By understanding the working principle and types of off-grid power inverters, you can make an informed decision when selecting the right inverter for your home solar system.

Working Principle of Off-Grid Power InverterDC to AC ConversionThe core function of an off-grid power inverter is DC to AC conversion, which involves several stages to ensure smooth and efficient power delivery.

DC Input: The inverter receives DC power from a battery, solar panel, or generator.Signal Detection: It detects the incoming DC voltage.Switching Circuit: The inverter uses switching circuits, such as MOSFETs, to chop the DC input into pulses.High-Frequency Transformer: The pulses are then fed into a high-frequency transformer to change the voltage level.Rectification and Filtering: The output from the transformer is rectified using diodes, followed by filtering capacitors to reduce noise and stabilize the output.AC Output: Finally, the inverter produces a smooth AC waveform that can be used by AC appliances.Key ComponentsMOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors): These components control the switching of the DC input into pulses.Transformers: Used for stepping up or stepping down the voltage levels.Rectifiers: Convert the AC output back into DC after transformation.Filtering Capacitors: Remove any residual noise and vibrations from the AC output.Types of Off-Grid Power InvertersSquare Wave InvertersAdvantages:Cost-effective and simple design.Suitable for basic applications that do not require a pure sine wave output.Disadvantages:Low efficiency and poor performance with sensitive equipment.Incompatible with devices that require a sine wave for proper operation.Modified Sine Wave InvertersAdvantages:Balanced cost and performance.Better efficiency compared to square wave inverters.Suitable for many household and industrial applications.Disadvantages:Cannot power all devices, especially those that require a pure sine wave.Less efficient than pure sine wave inverters.Potential for noise and interference in sensitive equipment.Pure Sine Wave InvertersAdvantages:High efficiency and compatibility with all devices.Produces a pure sine wave that is essential for sensitive electronics.No noise or interference.Disadvantages:More expensive due to complex design and advanced components.Higher maintenance requirements.Xinyuhua Pure Sine Wave Inverter 3000WSpecifications and FeaturesThe Xinyuhua pure sine wave inverter 3000W is designed to convert DC power to a pure sine wave AC output, making it ideal for home solar systems. Here are the key specifications and features of this inverter:
- Power Output: 3000W
- Output Waveform: Pure Sine Wave
- Voltage: 12V, 24V, 36V
- Size: Compact
- Efficiency: >90%
- Warranty: 2 years
Comparison with Other TypesCompared to other types of inverters, the Xinyuhua pure sine wave inverter offers several advantages:
- Technical Advantages: - Higher efficiency, typically over 90%.
- Compatibility with all types of AC appliances, including sensitive devices.
- Lower noise and interference levels.
- Disadvantages: - Higher initial cost.
- May require more frequent maintenance due to the advanced components.

Advantages and Disadvantages of the Xinyuhua Pure Sine Wave Inverter 3000WTechnical AdvantagesEfficiency: Superior efficiency ensures better power utilization, reducing the load on batteries and generators.Compatibility: Suitable for a wide range of appliances, including sensitive electronic devices like laptops, medical equipment, and high-end audio systems.Smooth Operation: Produces a pure sine wave output, which is essential for proper functioning of most modern electronics and appliances.Potential DrawbacksHigher Cost: The advanced design and components make the Xinyuhua pure sine wave inverter more expensive than other types.Maintenance: While the warranty provides a basic level of protection, advanced users may need to invest in regular maintenance and care.Best Practices for Off-Grid Power Inverter UsageInstallation TipsProper Placement: Ensure the inverter is placed in a well-ventilated area to prevent overheating.Battery Connection: Use high-quality cables and connectors to ensure a secure and reliable connection between the battery and inverter.Solar Panel Connection: Ensure there is a direct connection between the solar panel and the battery controller to optimize charging and performance.Maintenance TipsRegular Inspection: Periodically check the inverter for loose or corroded connections.Cleaning: Keep the inverter and surrounding area clean to prevent dust accumulation and ensure proper ventilation.Testing: Regularly test the inverter's output and efficiency using a multimeter.Troubleshooting IssuesFuses and Breakers: Check for tripped fuses or breakers and replace them if necessary.Circuit Breakers: Ensure all circuit breakers are set at the correct voltage and amperage ratings.Error Codes: Refer to the inverter's manual for troubleshooting error codes and solutions.Current Market Trends and Future ProjectionsMarket DemandThe demand for off-grid power inverters is continuously growing due to increased focus on renewable energy and home energy independence. Solar power systems are becoming more popular, driving the need for reliable and efficient inverters.Future TrendsAdvancements in technology are leading to more compact, efficient, and intelligent inverters. Expect to see improvements in:Smart Technology: Integration with smart home systems for better monitoring and control.Green Energy Solutions: Further development of energy storage and management systems.Energy Efficiency: Continued improvements in efficiency levels to reduce energy losses.Cost Reduction: Efforts to reduce the overall cost of production and installation.ConclusionWhether you are looking to efficiently manage your solar energy system or ensure smooth operation of sensitive devices, the Xinyuhua pure sine wave inverter offers a reliable solution.