Based on DSP born SVPWM inverter power utilization

This description of the one used in grid-connected PV systems, the use of three-phase voltage source PWM direct current master grid inverter design process,power inverter, and inverter control strategy were analyzed and seminars, and The Mitsubishi company smart power module IPM50RSA060 with the Texas Instruments (TI) company DSP chip TMS320LF2407 designed the prototype. The final test results show that the the appropriate inverter PWM moderate use of small and medium power PV grid system, and there is widespread use of vision. http://www.gridtieinverter.de/

1 PV Grid
power generation system
grid-connected PV systems important by the solar panels (photovoltaic arrays),Grid tie inverter, and grid-connected inverter, filter reactor and DSP control circuit formation. The structure of the system as a whole is shown in Figure 1.
situation in the power generation, the direct current into grid-connected PV systems use solar panels to convert solar energy into DC energy, re-use grid-controlled current source characteristics of the inverter to control the operation of the inverter can be seen from Figure 1 exchange of electricity to feed the grid.

The transform
the energy of the whole system and the transfer process, the application of IPM module formed the grid inverters road to achieve grid inverter control is the main circuit of the PWM signal to drive through the DSP born.
2 grid inverter dominated principle
basis photovoltaic grid power generation system works shows, is the center of all the grid system install grid-connected inverter, grid inverter function resolution with the functioning of the entire system. For Figure l shown in grid-connected PV system design grid inverter to take a three-phase half-bridge inverter topology structure, its structure is shown in Figure 2.




grid satisfaction following equation for the AC side of the inverter output voltage and current signals

above model L on behalf of the exchange side inductance parameter, R is the parasitic resistance of the inductor, The the inductor equivalent impedance Hongyuan resistor R regulator design influence can neglect the system design process.
according to the three-phase voltage source PWM grid mathematical model of the inverter, known grid inverter to control the output current by controlling the three-phase voltage source inverter leg output voltage control the output current at the same time progress in the photovoltaic grid-connected inverter system generating capacity and adequate application in equivalent a light premise PV array can supply maximum power in the PV grid inverter unit control system, the introduction of the maximum power point tracking (MPPT) skills.

shown in Figure 2 for the grid-connected inverter restraint structure. Figure 2 shows the grid inverter dominated structure of the outer ring power ring to take self-optimizing MPPT algorithm. Calculated by sampling the installation of the current inverter output voltage and current signals from the optimization algorithm of the output power of the current moment, and then figuring out a moment output power comparable to the swap has been based on the size of the output power grid inverter change the operating point, the ultimate make grid-connected inverter operating point along the curve of the maximum power of the PV array. Inverter MPPT algorithm figured out the PV array DC voltage loop command signal, the voltage loop error signal in this power point after PI regulator links output amplitude of the current loop instruction, the amplitude command and grid voltage synchronization signal phase multiplied by the current loop synchronous command signal, the output current of the system by the current error with the inner ring proportion regulator grasp the current loop gain resolution the systems output current is properly tracking the command signal, and decide whether photovoltaic grid system unity power factor to achieve maximum power to the grid.

Imitation sine wave the grid inverter defects and

not only do not understand so many AC inverter exactly what the different functions, or What are the disadvantages and advantages in different areas of use is that most of our technical staff also do not understand so many types of inverter , Why escalating until now to the requirements of the "pure sine wave" era, why can not meet the grid requirements by some people accused of the technology does not meet the technical specifications of the large-scale grid? Directly, most photovoltaic grid most of the supporting manufacturers inverter sine wave-shaped "glitch" too many problems, too much the cause of "glitches" and very profound practical significance in reality, even if the grid-connected inverter inverter efficiency reached 97%,Grid tie inverter, but the real contribution to the power grid and electrical equipment rate may reach 80%, this is what causes it? ,power inverter. Television screen that we often see on TV Jiangnan dragon-boat race in early May 5 http://www.gridtieinverter.de/

China Shipbuilding Industry photovoltaic inverter

 

recently developed by the China Shipbuilding Industry Corporation seventh thirteen studies assume 500KW PV inverter , Electric Power Research Institute of China National Energy solar power research and development ( experimental ) passed the low voltage across the test , and obtain the corresponding test report. Testing and certification , this type of inverter in full compliance with the the national grid photovoltaic power plants connected to the grid technical requirements " Grid tie inverter, " photovoltaic power plants connected to the grid test procedures across the functional requirements of the low voltage of the photovoltaic power plant . http://www.gridtieinverter.de/

low voltage across the grid voltage drop occurs in the case of the photovoltaic inverter can be kept in certain conditions and the time range and network, to support the grid fault recovery power inverter, thereby "through" the time of this low - voltage , to avoid causing the grid the failure of the enlargement . Low voltage ride through technology to improve the security and stability of the grid system .

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Wisdom made ​​broad communication power supply

communication power is the use of the modern power electronics technology, using a power semiconductor device as a switch, and by controlling the switching transistor turn on and off the time ratio (duty ratio), adjusting the output voltage, to maintain a stable output of a power supply. Early as in the 1980s, computer power supply the full realization of the communication switch, the first to complete the computer power and updating communication switch into the 1990s has been widely used in a variety of electronic and electrical equipment, program-controlled switchboards, communications, power and control of power testing equipment device power being. After 30 years of development, China's communication switch industry has formed its own complete industrial chain. According to the China Power Supply Society statistics, over one thousand domestic product communication switch. http://www.gridtieinverter.de/

communication electronic power supply main categories of products, due to its small and light weight, power density / high conversion efficiency, wide input voltage range, heat consumption is less and so many more advantages and benefits from the thin electronic products short of demand trends, the rapid development, the popularity rapidly replacing linear power in a variety of electronic products in the field. According to data collected by the China Power Supply Society, 2008 National Communication Switch (consists mainly of consumer communication switch, industrial communication switches, communications, power supply, PC power supply) output value reached 85.5 billion yuan, 93.1 billion yuan in 2009power inverter, an increase of 8.8%; in 2010 reached 102.7 billion yuan, an increase of 10.3%. Breakdown of communication switching applications, occupy the entire industry output share the industrial class communication switch, the output value of the industry-wide in 2010 accounted for 56%, the second largest consumer communication switch, accounted for 32%, communication communications to switch accounting for 6%, accounting for 3% of the PC communication switch.

energy saving communication switch to force home appliances "Chi" rigged
appliances intelligent of
, as today's home appliance industry green, energy saving other trends, it is along with energy saving technological transformation of the home appliance industry has targeted, tends to be more humane philosophy upgrade interpretations. The smart concept, only analog certain ability, enabling their own performance, self-improvement, to achieve a certain need of mankind, this is a real smart home appliances, communication switch industry to join, but also to the home appliance industry, "Chi" made to give more force.
With the continuous development of the technological level of the upstream components and key technologies, communication switching technology in the past 30 years has made rapid development. 1980s, the technical difficulties of late, the communication cost of the switch and the control circuit problems are overcome, it has quickly grown into the mainstream products in the power supply. Under the influence of the policy environment, energy saving, high efficiency, energy saving has become the development direction of power products, the power enterprise technology upgrade in terms of design, materialsGrid tie inverter, processes, etc., in the emerging field of intelligent digital TV, LED, IT applications will appear in the trend of steady growth and bring greater market space for China's telecommunications switching industry, and continue to maintain a rapid development.
from 2004-2010
according the internationally renowned investigation agency DATABEANS statistics, the annual global communications switch market sales has maintained an average of about 15% of the rate of growth, to about $ 12 billion in sales in 2010, including consumer electronics class power, the power of the field of communications and industrial power in the field of market share of the top three, the market size of $ 3.5 billion, $ 3.4 billion, $ 2.5 billion.

enhance service competitiveness to achieve efficient communication switch industry composite growth
communication power products model is very general businesses can not gain an advantage in each market segment, in addition to the power adapter and phone charger standardized products highly competitive lower margins, each enterprise has its main market segments, and actively explore new areas to be able to get a better profit margin. Communication switch industry to expand sales channels to participate in trade shows, mutual Recommended professional print media industry website promotion and customer quality customer resources is the most direct expression of the strength of enterprises. Strength of the large power enterprises basically started from OEM to ODM transformation of research and development to provide customers with one-stop service designed to processing, these corporate brand has a certain reputation in the industry, to get customers in product quality and research and development capabilities. recognized, and has the ability to have internal functional design and product design.
Power Institute of China and ICTresearch forecast that the Chinese power industry output in 2015 will reach 215.6 billion yuan, 187.5 billion yuan output value of China's telecommunications switch. In 2011-2015, the average annual compound growth of 13.39%. There will be more and more of the overall product manufacturers to outsource custom power business, excellent external professional team to undertake its business to focus on their core business, to reduce costs, improve efficiency and enhance core competitiveness of enterprises and external links resilience. In the trend, there will be more OEM / ODM manufacturers service as their own competitiveness.

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China's economic transition gradually from the ear

our economy from the early days of the planned economy gradually transition to a market economy , coupled with our country is a country with a large population , Food is bound to promote the vigorous development of China 's food industry , packaging machinery to improve the rate of food packaging is very key. The rate of food packaging in the United States, Japan and Europe were 90% , 80% and 70% , while China is only 5% , packaging machinery in the modern is great , the food machinery industry in China can be described as "money" way immeasurable . the founding of 60 years to

our people 's living standards and people's income has undergone earth-shaking changes now put forward higher requirements for the packaging of goods . Where there is a product where there is the packaging, can be said that the development of the packaging industry for the national economy as a whole structure plays an important role in the packaging alone Spark machinery, packaging machinery out widely , widely used in food, pharmaceutical, chemical , etc. various industries .

 

 

only from the point of view of food and other light industrial products Grid tie inverter, China 's total exports accounted for more than 1/3 are required to improve the packaging grades , which has brought many opportunities for the development of packaging machinery need a wide range of packaging machinery, food packaging and with the continuous improvement of people's living standards , people 's consumption patterns from subsistence to enjoy the type of transition , so the packaging machinery industry is a sunrise industry power inverter.

At present, China 's packaging machinery industry classification is as follows : filling machine , filling machine , sealing machine , wrapping machine , vacuum packaging machine , inflatable packaging machines , blister packaging machines , labeling machines , dry machine , bag making machine , coder ...

packaging machinery save manpower , labor , food companies should not be overlooked convenience , but also for the people brings a wide range of food packaging , to improve people's visual enjoy the taste . .. http://www.gridtieinverter.de/

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China Shipbuilding Industry photovoltaic inverter

 

recently developed by the China Shipbuilding Industry Corporation seventh thirteen studies assume 500KW PV inverter , Electric Power Research Institute of China National Energy solar power research and development ( experimental ) passed the low voltage across the test , and obtain the corresponding test report. http://www.gridtieinverter.de/

 

Testing and certification , this type of inverter in full compliance with the the national grid photovoltaic power plants connected to the grid technical requirements " Grid tie inverter, " photovoltaic power plants connected to the grid test procedures across the functional requirements of the low voltage of the photovoltaic power plant .

low voltage across the grid voltage drop occurs in the case of the photovoltaic inverter can be kept in certain conditions and the time range and network, to support the grid fault recovery power inverter, thereby "through" the time of this low - voltage , to avoid causing the grid the failure of the enlargement . Low voltage ride through technology to improve the security and stability of the grid system .

This article is from the: http://www.12vgridtiepowerinverters.com/

ADMC331 digital inverter power supply design

1 Introduction
followed by information skills to carry out power inverter are becoming more widely used in communications, military, aviation, aerospace and other areas. Traditional power inverter multi imitate the moderation may imitate figures associated restraint system, its robustness, the complex structure, the cost is high and unlucky in product replacement. Modern power inverter being carried out toward the all-digital, intelligent and collection bias. Followed by high-function digital signal flags disposal (DSP) presentation had become capable of completion of the full digital power inverter. In this paper, the bedrock on the ADMC331 specific profiling introductions detailed use of the ADMC331 restraint at full digital power inverter. the
structural features of 2 ADMC331
ADMC331 imitate American Devices, Inc. (ADI) based on DSP motor skills temperance, internally integrated 26MIPS (million instructions per second), fixed-point digital the signal flags disposal kernel, also the internal embracing The complete motor moderation peripheral line, and then move to the user, to efficiently develop the motor sparingly invented the very favorable premise. ADMC331 the function block diagram shown in Figure 1Grid tie inverter, the primary characteristics are as follows:
● using 16-bit fixed-point ADSP-2171 kernel code with the ADSP-2100 digital signal flags dispose series is fully compatible; It has three self full function accounting units, namely: a 16-bit arithmetic / logic unit (ALU), a 32-bit multiplier-accumulator (MAC), and a 32-bit barrel shifter (SHIFTER); episodes with two self data address is (DAGs) and a strong sequential timing. And therefore can accelerate the implementation of the sequence because a system configuration of the device is a parallel construct.
● single-cycle instruction execution effort 38.5ns (external 13MHz crystal oscillator), to be completed: occurrence of the next order of address, fetch the next instruction to execute one or two data move operations to update one or two data address pointers perform an accounting operation function.  http://www.gridtieinverter.de/

● Built-2k × 24 bit sequence memory ROM, 2k x 24 bit order memory RAM and 1k × 16-bit data memory RAM.
● pulse width modulation (PWM) based on the midpoint of a three-phase 16 attack, high-precision PWM signal flags disposal minimum expenditure sensitive programming occurs.
● the channel frequency programmable with 2-channel 8-bit the assistant pulse width modulation (AUXPWM).
● seven Σ-Δ A / D conversion channel, the maximum resolution of 12 bits, the maximum sampling frequency of up to 32.5kHz.
● has 24 programmable digital input and output (PIO) port can be set to input or output alone, supporting the morphological changes in infix.
● to supply 2 double-buffered Synchronous Serial Port (SPORT0, SPORT1), to be completed by the communication between the serial communication and multi disposal.
● 16 with timely infix watchdog time is.
● order of internal memory ROM curing some of the applicable order, facilitating the order of the system design, and cut the order of the digital restraint system accounting effort.

3 Examples of use
ADMC331 composed of fully digital inverter power structure shown in Figure 2.
signal flags the 3.1 PWM constitute
the ordinary full digital power inverter is necessary for to 4 Road accurate PWM-time signal flags to drive IGBT inverter bridge, this also drive each power tube PWM signal flags necessary for a conduction delay, in order to avoid the upper and lower leg power switch is turned on breaking the system. Occurrence of the PWM signal flags is completed by the ADMC331 within PWM moderation is the ADMC331 the PWM attack units in sensitivity and programmability fully digital PWM method differences of approach to be contentpower inverter. Figure 3 is a function block diagram of the three-phase PWM restraint by ADMC331. The the
ADMC331 PWM unit is to establish the foundation of a three-phase time is self, by three to determine the cycle storage to moderation, each cycle storage restraint on the PWM output. The restraint required DSP sequence can be prepared in accordance with the requirements of the use of premises, as well as the needs of the PWM. Figure PWMPOL door gate drive circuit logic and structure to select the PWM output polarity of each channel PWM output signal flags that can be passed through the self-reliance so can be stored the device PWMSEG to resolution output enable or to stop. PWMTRIP circuit hardware maintenance when this pin is low, often, the entire system is reset without a premise for maintenance of the entire circuit. In addition to clock output the of signal flags CLKOUT and PWM synchronization signal flags PWMSYNC.

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