Stay On-Grid, Stay Off-Feed: The Magic of Hypontech's Zero Export Solution
Published on : 2024-11-04
In photovoltaic systems, solar modules convert sunlight into DC power, which is then transformed by an inverter into AC power for consumption. Self-consumption of solar energy can reduce the electricity cost or, where local regulations allow, resell this energy to the public grid for a profit. However, in some countries, local regulations impose power limits and zero exports, which do not allow the transmission of electricity to the grid.
When system generation exceeds the energy demand of on-site loads, the excess current flows back to the grid, creating a phenomenon known as "reverse power flow." This reverse flow can impact grid stability and stress grid infrastructure.
Guarding the Grid: How Hypontech Achieves Zero Export Limit
Hypontech’s zero export solution for commercial and industrial PV systems addresses this challenge. This solution is designed to meet local requirements in certain regions, allowing systems to connect to the grid but preventing feed-in, ensuring self-consumption of generated power with no excess being sent back to the grid.
By installing CTs (current transformers) and smart meters at the grid-connection point, the system can monitor current magnitude and direction in real-time. The smart meter, through CT sampling, measures current data at the connection point and communicates this to the inverter via RS485. Based on real-time data and site-specific power needs, the inverter dynamically adjusts its output power to achieve "zero-feed power," effectively preventing reverse power flow. This approach enhances system safety, operational efficiency, and ensures smooth and reliable grid integration.
Choosing the Right CT: Key Tips for Selecting Your "Current Detective"
To set up zero export, the inverter typically requires CTs to monitor current direction and control inverter output, preventing surplus power from feeding back into the grid.
CT specifications should match the highest current levels at the grid connection point. For instance, if the inverter output is 1000A and the maximum load current is 2000A, a CT rated at least 2000:5 is recommended for accurate measurement. Proper installation and compatibility with the inverter interface are essential for optimal performance.
Intelligent Management with the HM 2000D
With the HM 2000D smart digital energy control system, Hypontech's solution supports up to 48 inverters, with each RS485 port connecting up to 16 inverters, significantly enhancing system scalability and compatibility.
Cooling Costs, Zero Worries: A Zero Export Solution for a Philippine Cold Storage Industry
A large cold storage facility in the Philippines, with stringent temperature control requirements, faced high electricity demands. Adding to this challenge, local regulations mandate that solar power systems must be "grid-connected with zero export."
To comply with this policy and reduce operational costs, the facility installed 14 Hypontech’s HPT-50K three-phase on grid inverters and customized a zero export solution that directs all generated power to self-consumption. By deploying this system, the facility has substantially cut electricity costs, with annual savings that have significantly enhanced overall operational profitability.
A Partner to the Grid: Minimal Impact, Maximized Efficiency
In regions where regulations prohibit excess PV power from feeding into the grid, Hypontech’s zero export solution prevents grid backflow while maintaining grid stability.
Particularly beneficial in areas with limited grid capacity, this solution boosts system safety. By adjusting inverter output power, the zero export system minimizes wear from frequent start-stop cycles, extending equipment lifespan and reducing maintenance costs. Moreover, this solution optimizes on-site energy use, prioritizing self-generated power, and lowering energy expenses.
Hypontech’s commercial and industrial zero export solution provides an economically and sustainably efficient choice for enterprises. Through intelligent power regulation, real-time monitoring, and deep integration with energy management systems, it supports grid stability and reduces grid dependency. As technology advances, Hypontech’s solution will bring increasing social and economic value to more enterprises.
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