June 2013 19-21 days Chint Power Systems attended the Intersolar in Munich, Germany, solar technology expo. The show features new 8/10/12KW and 5/6/7kw phase inverter platform machine, a new generation of 20-25KW three-phase inverter , and single-phase small power inverter series.

        New 8/10/12KW and 5/6/7kw dc to ac power inverter used in all film capacitors, the product longer life and lower maintenance costs. The dual MPPT design even allows asymmetric configuration , making it more flexible. The maximum input voltage from 800V to 1000V, the operating voltage range is widened to 250-950V.

Surveillance standard RS485 interface , while providing Ethernet , Zigbee communication interface for the election , and you can update the firmware via the standard USB interface . Built- DC switching products provide a safer, more reliable protection for a variety of applications. And in strict accordance with EMC Class B requirements for the design , to make products in household or commercial environment safer.

        The new generation of 20KW and 25KW are transformerless design , three-phase AC output products . Algorithms and thermal design patent certification through a three-level control enables the highest efficiency of our products reached 98.2% efficiency reached 97.8% in Europe . This new generation of three-phase string on grid inverter integrated DC switch , and installation of the optional fuse in the junction box . These product launch , a good international market reaction , there are already orders sold Netherlands.

        Although the exhibition is affected European double reverse , the visiting crowd and exhibitors has decreased. But Chint Power Systems products at the show are still concerned by the participants .

PV inverters are used in the field of solar photovoltaic dedicated inverter. DC power generated by the solar cells will power electronic conversion technology converts directly into the grid, the exchange of energy load. PV systems are indispensable core member.

Central inverter is an inverter switching circuit device, referred to as the grid tie power inverter circuit. The electronic switch circuit by the power turn-on and turn-off, to complete the function of the inverter. Classification method of the inverter are many, for example: according to the number of phases of the inverter output AC voltage can be divided into single-phase and three-phase inverter inverter; according to the device type semiconductor inverters different, but also divided transistor inverter, thyristor inverters and turn-off thyristor inverters.

Depending on the principle of the inverter circuit, can be divided into self-oscillating inverter, inverter ladder wave superposition and pulse width modulation inverter, etc.. Depending on the application and the network system or in off-grid systems can be divided into grid-connected and off-grid inverter inverter.

The following classification of the inverter to apply different occasions: central off grid inverter: centralized inverter technology is several parallel PV strings are connected to the same centralized inverter DC input, the general use of three large power IGB T phase power modules, the use of smaller power field effect transistors, using DSP converter controller to improve the quality of output power, making it very close to sinusoidal current, generally used for large-scale photovoltaic power plants ( > 10kW) system.

String inverters: string inverters are based on each PV string (1-5kW) through an inverter, the DC side has a maximum peak power tracking based on a modular concept, in parallel with the AC side and network. Many large-scale photovoltaic power plants using string inverters.

Micro Inverter: micro inverter in photovoltaic system, solar panels are access each piece a micro inverters, solar panels when there is not a good piece of work, only this one will be affected, while other PV panels will run in top working condition so that higher overall system efficiency, greater power generation.

Governments and power companies are expected to photovoltaic (PV) power generation will account for a large proportion of their total energy supply in. The DC conversion solar cells is synchronized with the AC grid is designed to have stringent requirements, especially the future. PV inverter must achieve maximum efficiency over a wide power range and operating conditions, and must meet stringent safety requirements. Depending on the final performance of the inverter based power accurately measured. PV inverter manufacturers need to work closely with the sensor manufacturer, to ensure support for the latest trends in photovoltaic technology.

Our world requires use of "green" renewable energy alternatives to fossil fuels to benefit the environment. Forecast for the near future power supply system includes a variety of realistic scenarios of energy, including solar energy has a variety of configurations scale, both covering several hectares of large-scale power plants, but also means single-family use. This will promote the photovoltaic (PV) solar inverter market to grow strongly. Even in the current economic downturn, the PV market is expected to reach $ 34 billion in 2013. About PV market considerations, the newer devices is expected of all sizes will be connected to the grid; single-family home system, even if partial load generating capacity than necessary, but also to the power company transmission and sale of electricity.

PV systems to achieve their full potential, we must improve the efficiency of power generation in order to reduce the cost per kilowatt. As we all know, solar cell manufacturers have been working to improve the efficiency of solar radiation into electricity basis; photovoltaic manufacturers are designing next-generation inverter, increase power and efficiency through increased diagnostic and other functions, increased intelligence and functionality. The latest trend is a multi-string technology: more than the series connected solar cell consisting of series connected to a single inverter, in which each cell has its own maximum power point tracking (MPPT) device, thereby maximizing energy production .

Solar power is not easy to use. The battery is open, the nominal output voltage of about 0.6 volts: typically each solar cell panel up to 72, an open circuit 44 volts. The output level of a battery short-circuit current. At a point between these limits, the battery output voltage and a maximum power current. The maximum power point with the operating conditions (such as the projection of solar radiation) changes, so that the inverter http://www.gridtiepowerinverteronline.com/ must be tracked in order to maintain maximum efficiency point. Designers rely on instantaneous voltage and current sensor data acquisition, software algorithms to do this.

Inverter output current is generally 15 to 50Arm, measured by the sensor to the pulse width modulation (PWM) sine wave output feedback controller, the measurement of power into the grid. The controller is mainly based on a microprocessor or digital signal processors, these processors with +5 volt power supply, working voltage reference shared with other active components of the electronic control system.

The HMS LEM current sensor +5 volt power supply operation. Provide internal reference voltage (2.5 volts) through separate pins, making them easy to use and with a DSP or microprocessor. However, they are also able to withstand these DSP's external reference (between 1.5 to 2.8 volts), which generates its own benchmarks. This makes the entire application more efficient, helping to eliminate errors in the calculation of baseline drift.

" Europe 's 'dual' , mainly for photovoltaic cells and modules , while the PV inverter , it is not 'dual' influence due to a series of national support policies for the photovoltaic industry , inverters instead, a certain degree of development , but the recent past , with the large-scale photovoltaic power plants ' rush fashions ' appearance , the domestic photovoltaic inverter dropping lower and lower prices , while at the same time , the conversion efficiency of the inverter but with a higher reliability requirements . " recently, the Czech Republic, the East had Hitachi ( Chengdu ) electric Control Equipment Co., Ltd. Solar product manager said in an interview with reporters .

Affected by many factors, current inverter suppliers are facing enormous price pressure. In China , the average price of the dc to ac converter has been at a relatively low level, while in 2013 China will become the largest inverter shipments City, often as the market is cheap central inverter dominate , prices are expected to further decline .

PV industry has experienced industry after winter , the relevant state departments to encourage the rapid development of the domestic PV market , the introduction of a distributed subsidies , renewable energy quota system , power grid and other compulsory acquisition policy, driven by a series of favorable policies , China's large-scale PV market opens soon .

Domestic photovoltaic equipment manufacturing enterprises in Europe and America because it seems " double reverse " and " a blessing in disguise ." In the downstream PV dc to ac inverter business , also subject to the benefit of national policy, market demand continues to expand.

Following the pre- PV "eight countries " , as well as six of the New Deal State Council executive meeting after pushing the photovoltaic industry to prove safety , September 29 , the Ministry of Finance website notice again , as a 50% reduction of photovoltaic power generation self . Within a few months time , the photovoltaic industry policies followed, or whether policy efforts to support the frequencies were significantly exceeded expectations.

Industry insiders believe that the government support the determination of large domestic PV market is expected in the fourth quarter of distributed PV power grid connection process and qualification for exemption Conditions will gradually implement the policy , the next two years, China's high demand for photovoltaic applications will continue , including the distribution of PV is expected to achieve explosive growth .

In fact, 2013 will mark the fourth quarter of photovoltaic power plants "grab mounted boom" , while 35 GW of PV installed capacity target "five" plan put forward relevant , still be the domestic inverter market the next two years to bring positive signal.

" Since the introduction of the National Development and Reform Commission policy , September 1 to get approval before the end of the completion of the PV power plant , you can still enjoy one yuan / kWh benchmark price is expected to get the approval of the current installed capacity of 4 to 5 GW Kyrgyzstan watts , the fourth quarter is expected to eventually installed or 3 GW to 4 GW, domestic manufacturers have full production line for annual shipments of 15 gigawatts to 18 gigawatts component manufacturers, 3 to 4 GW Kyrgyzstan watt limited demand-pull , grab the domestic market links installed on the inverter maximum pull . " McNair told reporters who

Recently, from the world's leading insurance company , news came Suzhou New Energy Technology Co., Ltd Ohm Nick ( hereinafter referred to as Ohm Nick ) solar PV inverter products, production systems and asset quality system has passed the rigorous review of insurance companies , insurance companies can be successfully included in the list . In the future, as long as the user selects ohm Nick insure users worldwide installed power plants, all revenue from factors such as product quality and environmental hazards resulting from lower than expected, the insurance company will have to provide compensation contract terms . It is reported that the move in the domestic solar PV inverter industry, it is the first case .

        With the rising cost of electronic components , as well as rising labor costs , increased price competition among manufacturers of inverters , which for the inverter business is a challenge . Inverter products are not price , will reduce the profits of the enterprise itself ; If forced to disregard market prices , EPC providers and power plant owners can not be accepted. In this dilemma dilemma , some do not pay attention to brand inverter business will take to cut corners in order to replace the means of components to reduce costs. Such behavior had seriously disrupted the market order and good inverter directly tremendous impact on earnings power plant owners.

        But after insurance products enable users within the scope of the contract , no matter the hardware , such as due to a short circuit caused by the input device generating capacity by half ; or software problems caused by various types of downtime , generating zero ; then, or since the amount of power the harsh cold, heat generated decreased environmental impact . Even the loss occurred in the product packaging, logistics can enjoy the process of insurance claims , making the plants more to protect the user's investment income .

        Mr. Ohm Nick Liu , vice president of global marketing settle down , said: "We are very proud to be the first companies to launch an wind turbine inverter such innovative insurance solutions , we believe our design is the best way to protect user interests ." He said as a company founded not long , ohm Nick has focused on the development and manufacture of 20 kilowatts or less of household-type machine , and its firm " rely on the quality and development " concept among the well-known international brands. Steady development , the ohmic Nick recognizes the importance of the quality and credibility of the brand , the follow-up work will focus on spare no effort to promote product development and upgrades.