A New Technology For Solar-Central Distributed Inverter Solution

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Sineng integrated the respective advantages of string inverter and central inverter, proposed the central distributed inverter solution, which can increase the power generation efficiency and reduce the system cost.

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Compared to the traditional central inverter solution, DC combiner is replaced by the intelligent MPPT combiner. Each 1MW power generating system has 48 independent MPPT units, which can effectively solve power generation losses because of dust covering, shade blocking, direct current line loss inconformity, module degradation, dip angle discrepancy and other module mismatch and increase at least 2% power generation. Each power unit is improved from the traditional central 1 MW capacity to the central distributed 2 MW capacity, with make simper networking scheme and lower system cost.

Because the voltage from the intelligent MPPT combiner to the inverter is promoted above DC 800 V, the AC voltage from inverter to the transformer is promoted to AC 520V, corresponding cost of AC/DC cable can be reduced over 30%; Each 2 MW square uses 2 MVA double split winding transformer, to replace the two groups of 1 MVA double split winding transformer, and cost reduces about 30%; For smaller inverter room, the cost is reduced by about 50%.

The summarized energy by 48 optimization unit is concentrated transported to the grid through 1 MW inverter , which inherit the advantages of central inverter such as high reliability, easy maintenance and management, and ensure the output power quality and grid-connected performance are optimized.

Typical Networking Scheme
Each 2 MW photovoltaic power generation unit consists of 24 intelligent MPPT combiners and 2×1MW central distributed inverters. The typical networking scheme show as follows:

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Reducing Cost of System
The voltage from the intelligent MPPT optimizer to the inverter is promoted above DC 800 V, the AC voltage from inverter to the transformer is promoted to AC 520V, corresponding cost of AC/DC cable can be reduced over 30%.

The inverter is equipped with DC distribution unit, so it's not necessary to allocate DC distribution unit and DC cable between cabinets, which reduces much more cost.

Each 2 MW square uses a 2 MVA double split winding transformer, to replace the two groups of 1 MVA double split winding transformer, and cost reduces about 30%.

The construction cost of power distribution room is low, the number of the prefabricated PV Inverter room of 2MW central distributed system reduced to half compared with the central system. The construction capacity reduced, and the construction costs of power plant will be saved further.

Working Mode
In actual PV power generation system, such problems as dust covering, shade blocking, direct current line loss inconformity, module degradation, dip angle discrepancy and other module mismatch are inevitable. I-V curved line of every module is difficult to keep the same. the traditional central inverter solution can't make each string effectively work on its maximum power point, while the string MPPT central distributed inverter solution can maximize the function of everyone independent MPPT module.

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Comprehensive intelligent monitoring and diagnosis solution with string PV character- istic curve scanning

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String monitoring and diagnosis
Meticulous power generation curve, any string abnormal can be found immediately
Built-in high-precision string PV curve scanning function, the performance can match the professional instrument, and the properties of the string is clear

String protection, make sure the system reliability
Enhanced safety protection measures
Equipped with the intelligent electronic switch, which can be shut down reliably when fault occurs Standard output active circuit break protection
Realizing the fault isolation of the input and output, avoiding the potential failure thoroughly

About Sineng
Sineng Electric Co., Ltd. is a leading equipment manufacturer and solution provider in power and related industries, providing customers with solar inverter solution, power quality control solution, energy storage system and new energy automobiles charging solution.

In 2014, following integration with a Fortune 500 company's solar business, Sineng became a leader in terms of R&D, management and marketing in the global PV market. Currently, Sineng Electric has completed the establishment of its local sales and service system for the Indian market. Once the new modern facility goes into production in Bangalore, the company's annual solar inverter production capacity is expected to reach 5GW. Sineng Electric is capable of meeting the diversified needs of its customers with 1~2500kW string inverter, central inverter and central distributed inverters (1000Vdc/1500Vdc).

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