思格加码高功率组串式逆变器，地面电站进入“系统减法”阶段

Core Viewpoint - The article discusses the evolution of string inverters in large-scale ground-mounted solar power plants, emphasizing the need for simplification in system design while enhancing power capacity. Group 1: Industry Evolution - The solar industry is transitioning into a "large base era," with single project capacities increasing from hundreds of megawatts to gigawatts, and sub-array capacities moving from 1MW to 3MW or even 5MW [1]. - As power plants grow larger, the requirements for string inverters are also increasing, necessitating a shift from quantity-based scaling to capability-based simplification [2][12]. Group 2: Technical Advancements - The new 506kW string inverter reduces the number of inverters needed for the same scale of power plants, leading to fewer connection points and lower construction complexity [4]. - The upgrade to a 1000V AC system allows for significant optimization in cable configuration, resulting in cost savings of approximately 2.1 cents per watt in copper scenarios and 1 cent per watt in aluminum scenarios compared to traditional 800V AC systems [6]. - The maximum DC input has been increased to 1650V, allowing for longer string configurations and reducing the total number of strings, which in turn lowers DC cabling costs and enhances operational safety margins under extreme weather conditions [8]. Group 3: Systemic Redefinition - The combination of 506kW, 1000V AC, and 1650V DC represents a systemic reduction in complexity, achieving about a 10% decrease in Balance of System (BOS) costs compared to traditional 300kW platforms [10]. - The introduction of new SiC (silicon carbide) MOSFET devices supports higher voltage platforms and improves efficiency by reducing switching losses, which enhances overall system performance [11]. - The design focuses on high voltage and power platforms, ensuring that power increases do not compromise efficiency, thermal performance, or long-term reliability [11]. Group 4: Simplification Logic - The new inverter technology aims to simplify the construction and operational processes of large ground-mounted solar power plants by using fewer devices, shorter cables, and clearer structures, which may be more impactful than merely increasing power ratings [12].