Kehua Hengsheng is the first company in China to overcome the technical difficulties of 1500V single system 1.5MW high and low penetration, and help to achieve affordable access to the grid

As the core of the photovoltaic power generation system, the performance of the photovoltaic inverter has a significant impact on the revenue of the photovoltaic power station. Continuously improving the applicability and reliability of the inverter system under various extremely harsh working conditions is the top priority to ensure the stable revenue of the photovoltaic power station and achieve grid parity.

Recently, Kehua Hengsheng, as the first company in China to pass the 1500V single system 1.5MW low voltage and high voltage ride-through certification of the State Grid Electric Power Research Institute, has been authoritatively recognized for the reliability and grid adaptability of Kehua Hengsheng's 1500V photovoltaic inverter system, and its technical strength is in a leading position in the industry. This is the first breakthrough in this field in China, and it is also a full reflection of Kehua Hengsheng's accumulated technical strength over the years and rich application experience in 1500V large power stations.

Kehua Hengsheng 1500V centralized inverter boost integrated system

Effectively cushion the impact of subsidy reduction

Start a new engine for photovoltaic grid parity

As the bridge of the photovoltaic system, the photovoltaic inverter is the key to reducing the cost per kilowatt-hour and improving the utilization efficiency of photovoltaics.

From 600V to 1000V, and then from 1000V to 1500V, the technological innovation has brought about the continuous improvement of power generation and photovoltaic utilization efficiency. According to IHS statistics, the global large-scale ground scene 1500V shipment volume exceeded 62% in 2018 (excluding China). The application of 1500V system brings higher voltage, longer string length, and lower equipment, cable, construction, and later operation and maintenance costs.

Reducing costs and increasing efficiency, and promoting grid parity are inevitable trends. In this process, technical breakthroughs in the safety and reliability of 1500V systems have become an important issue facing domestic new energy companies.

The voltage increase means the requirements for safety protection are improved, and the focus should be on insulation, electrical clearance, and breakdown discharge caused by the voltage increase, etc. This includes the requirements for the low voltage ride-through and high voltage ride-through capabilities of photovoltaic inverters.

High Voltage Ride Through

When a grid fault or disturbance causes a voltage increase (up to 1.3 times the grid voltage), the inverter system not only has the ability to avoid damage, but also ensures continuous operation without disconnecting from the grid.

Low Voltage Ride Through

When the grid-connected voltage of a photovoltaic power station drops due to an accident or disturbance in the power system, the photovoltaic power station can ensure continuous operation without disconnection within a certain voltage drop range and time interval. And it can continue to provide a certain amount of reactive power to the grid within the specified time/speed, continuously support the grid, and improve the reliability of the grid.

By achieving low voltage ride-through and high voltage ride-through, it can effectively ensure that the photovoltaic inverter can quickly restore active output when the power grid is restored, thereby maximizing power generation revenue and improving power grid stability.

Pushing down the cost of photovoltaic systems and promoting grid parity

At present, Kehua Hengsheng has achieved fruitful practical applications in the 1500V system, including high-altitude applications at the Qinghai Delingha Leader Base, as well as the Wuhai Leader project, a 100MW grid-connected project of a Russian power company, a 200MW project in India, and Taishan fishery-photovoltaic complementary project.

Aiming at overseas application environments, Kehua Hengsheng independently developed a 1500V centralized "turnkey" system with a single system power of up to 3.6MW. It integrates the distribution system, inverter control system and communication interaction system, and combines "monitoring", "control" and "measurement" functions to accelerate system deployment speed and reliability to the greatest extent.

The road to grid parity is long and arduous, and must be driven by key technological innovation. As a provider of new energy solutions and integrated energy services, Kehua Hengsheng is committed to improving power generation technology and providing excellent solutions to help the industry reduce costs and increase efficiency and accelerate the arrival of the era of grid parity for photovoltaics.