{"id":15967,"date":"2026-08-25T09:00:00","date_gmt":"2026-08-25T07:00:00","guid":{"rendered":"https:\/\/tps-elektronik.com\/?post_type=case_studies&#038;p=15967"},"modified":"2026-08-25T09:16:19","modified_gmt":"2026-08-25T07:16:19","slug":"how-to-achieve-high-efficiency-bidirectional-power-conversion-in-utility-scale-battery-storage-with-tps-custom-energy-storage-transformer-solutions","status":"publish","type":"case_studies","link":"https:\/\/tps-elektronik.com\/en\/case-studies\/how-to-achieve-high-efficiency-bidirectional-power-conversion-in-utility-scale-battery-storage-with-tps-custom-energy-storage-transformer-solutions\/","title":{"rendered":"How to Achieve High Efficiency Bidirectional Power Conversion in Utility-Scale Battery Storage with TPS Custom Energy Storage Transformer Solutions?"},"content":{"rendered":"<article class=\"blog-post\" lang=\"en\"><header>\n<p>A European utility-scale energy storage developer faced a critical project milestone: their 50 MW \/ 200 MWh battery energy storage system had to achieve bidirectional power conversion efficiency above 97% while maintaining galvanic isolation between the 1500V DC battery bus and the medium-voltage AC grid. Standard off-the-shelf transformers could not meet the combined requirements of high efficiency, bidirectional operation, and grid code compliance. The project schedule left no room for multiple design iterations.<\/p>\n<p>TPS Elektronik&#8217;s <strong>custom transformer solutions<\/strong> for energy storage applications were engaged to design, manufacture, and deliver a purpose-built isolation transformer that enabled the PCS to achieve bidirectional power conversion with minimal losses\u2014from concept to grid-connected operation in under 16 weeks.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/additional-services\/\">Request a custom transformer solutions consultation \u2192<\/a><\/p>\n<\/header><nav class=\"toc\" aria-label=\"Table of contents\">\n<h2 id=\"toc\">Table of Contents<\/h2>\n<ol>\n<li><a href=\"#the-challenge\">The Challenge: Bidirectional Power Conversion at Utility Scale<\/a><\/li>\n<li><a href=\"#the-solution\">The TPS Solution: Custom Energy Storage Transformer Design<\/a><\/li>\n<li><a href=\"#technical-approach\">Technical Approach: 1500V DC Isolation and Grid-Tied Compliance<\/a><\/li>\n<li><a href=\"#results\">Results: 98.2% Efficiency and Grid Code Compliance<\/a><\/li>\n<li><a href=\"#tps-capabilities\">TPS Custom Transformer Solutions for Energy Storage<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"the-challenge\">\n<h2>1. The Challenge: Bidirectional Power Conversion at Utility Scale<\/h2>\n<p>Utility-scale battery energy storage systems (BESS) are the backbone of grid modernization and renewable energy integration. These systems must efficiently convert power in both directions: from AC grid to DC battery storage during charging, and from DC battery to AC grid during discharging. At the heart of this bidirectional power flow is the <strong>power conversion system (PCS)<\/strong>, which relies on a transformer to provide galvanic isolation, voltage transformation, and grid interface.<\/p>\n<p>The customer\u2014a European renewable energy developer\u2014was planning a 50 MW \/ 200 MWh BESS installation to support grid stabilization and renewable integration. The project required:<\/p>\n<ul>\n<li><strong>Bidirectional power conversion<\/strong> with efficiency above 97% in both directions<\/li>\n<li><strong>Galvanic isolation<\/strong> between the 1500V DC battery bus and the medium-voltage AC grid<\/li>\n<li><strong>Grid code compliance<\/strong> with European grid connection requirements<\/li>\n<li><strong>Containerized footprint<\/strong> for rapid deployment and scalability<\/li>\n<li><strong>Thermal management<\/strong> for continuous operation in outdoor environments<\/li>\n<\/ul>\n<p>The previous supplier was unable to deliver a transformer that met the combined requirements of high efficiency, bidirectional operation, and the physical constraints of containerized deployment. Standard off-the-shelf transformers either lacked the efficiency required for the project&#8217;s ROI targets or could not provide the galvanic isolation needed for the 1500V DC bus.<\/p>\n<p>TPS Elektronik was engaged to develop a <strong>custom energy storage transformer<\/strong> solution that would enable the PCS to achieve bidirectional power conversion with minimal losses while meeting all grid code requirements.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-17054\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/08\/Multi\u2011Unit-Parallel-Bidirectional-Power-Supply-System-1920-kW-ATE-Rack-Configuration-\u2013-TPS-Elektronik-1.jpg\" alt=\"Multi\u2011Unit-Parallel-Bidirectional-Power-Supply-System-1920-kW-ATE-Rack-Configuration-\u2013-TPS-Elektronik Multi\u2011Unit-Parallel-Bidirectional-Power-Supply-System-1920-kW-ATE-Rack-Configuration-\u2013-TPS-Elektronik\" width=\"1920\" height=\"1004\" \/><\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/additional-services\/\">Learn more about TPS custom transformer solutions \u2192<\/a><\/p>\n<\/section>\n<section id=\"the-solution\">\n<h2>2. The TPS Solution: Custom Energy Storage Transformer Design<\/h2>\n<p>TPS Elektronik&#8217;s approach combined deep expertise in power electronics with a comprehensive understanding of grid-tied energy storage requirements. The solution encompassed custom transformer design, manufacturing, and integration support.<\/p>\n<p><strong>Custom Design &amp; Engineering:<\/strong><\/p>\n<ul>\n<li>Custom transformer design optimized for bidirectional power conversion<\/li>\n<li>Core and winding design for minimal losses at 50 Hz \/ 60 Hz operation<\/li>\n<li>Insulation system rated for 1500V DC bus voltage with appropriate creepage and clearance<\/li>\n<li>Thermal design for forced-air cooling in containerized deployment<\/li>\n<\/ul>\n<p><strong>Manufacturing &amp; Quality:<\/strong><\/p>\n<ul>\n<li>Precision winding and core assembly per IEC 60076 standards<\/li>\n<li>In-process quality control and testing at every manufacturing stage<\/li>\n<li>Factory Acceptance Testing (FAT) per customer specifications<\/li>\n<li>Full documentation package including test reports and material certificates<\/li>\n<\/ul>\n<p><strong>Integration Support:<\/strong><\/p>\n<ul>\n<li>Mechanical integration guidance for containerized deployment<\/li>\n<li>Electrical interface coordination with PCS and grid connection equipment<\/li>\n<li>Commissioning support and on-site testing<\/li>\n<\/ul>\n<p>TPS Elektronik&#8217;s <strong>custom transformer solutions<\/strong> service is built on a foundation of extensive EMS capabilities. TPS is a power electronics EMS service provider specializing in industrial power supplies, energy storage for renewable energies, and customized OEM and ODM production services. This vertical integration\u2014from component sourcing to final assembly\u2014enabled faster prototyping and reduced supply chain complexity for the customer.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-17049\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/08\/2u-20260617-2.jpg\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/08\/2u-20260617-2.jpg 1536w, https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/08\/2u-20260617-2-600x400.jpg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/p>\n<\/section>\n<section id=\"technical-approach\">\n<h2>3. Technical Approach: 1500V DC Isolation and Grid-Tied Compliance<\/h2>\n<p>The technical foundation of the TPS solution was a custom-designed isolation transformer that addressed the specific requirements of 1500V DC battery systems and grid-tied bidirectional operation.<\/p>\n<p><strong>Isolation Transformer Design:<\/strong><\/p>\n<ul>\n<li><strong>Voltage rating:<\/strong> Custom winding configuration to match the 1500V DC battery bus and medium-voltage AC grid<\/li>\n<li><strong>Power rating:<\/strong> Scaled to match the 50 MW PCS capacity with appropriate overload margins<\/li>\n<li><strong>Insulation system:<\/strong> Reinforced insulation with creepage and clearance per IEC 60076 and applicable grid codes<\/li>\n<li><strong>Core material:<\/strong> Grain-oriented silicon steel with low losses for high efficiency<\/li>\n<li><strong>Winding configuration:<\/strong> Optimized for bidirectional power flow with minimal impedance variation<\/li>\n<\/ul>\n<p><strong>Bidirectional Power Conversion Optimization:<\/strong><\/p>\n<p>Bidirectional operation presents unique challenges for transformer design. Unlike unidirectional transformers, where power flow is constant in one direction, bidirectional transformers must maintain efficiency and voltage regulation regardless of power flow direction. TPS addressed this through:<\/p>\n<ul>\n<li><strong>Symmetric winding design<\/strong> that maintains consistent leakage inductance in both directions<\/li>\n<li><strong>Low-loss core materials<\/strong> that minimize hysteresis and eddy current losses under varying load conditions<\/li>\n<li><strong>Optimized turn ratios<\/strong> that support both charging and discharging voltage requirements<\/li>\n<\/ul>\n<p><strong>Grid Code Compliance:<\/strong><\/p>\n<ul>\n<li>Harmonic distortion mitigation through optimized transformer design<\/li>\n<li>Voltage regulation to meet grid connection requirements<\/li>\n<li>Protection coordination with PCS and grid protection systems<\/li>\n<\/ul>\n<p>For <strong>grid-tied BESS transformer<\/strong> applications, the isolation transformer serves as the critical interface between the battery system and the grid. It provides galvanic isolation for safety, voltage transformation to match grid levels, and impedance for fault current limitation. TPS&#8217;s design ensured that all three functions were optimized for the customer&#8217;s specific application.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/additional-services\/\">Discuss your custom transformer requirements \u2192<\/a><\/p>\n<\/section>\n<section id=\"results\">\n<h2>4. Results: 98.2% Efficiency and Grid Code Compliance<\/h2>\n<p>The custom energy storage transformer delivered by TPS Elektronik exceeded the customer&#8217;s performance targets while meeting all grid code requirements.<\/p>\n<p><strong>Key Results:<\/strong><\/p>\n<ul>\n<li><strong>Bidirectional efficiency:<\/strong> 98.2% measured efficiency in both charging and discharging modes, exceeding the 97% target<\/li>\n<li><strong>Galvanic isolation:<\/strong> Reinforced insulation rated for 1500V DC bus voltage with safety margins<\/li>\n<li><strong>Grid code compliance:<\/strong> Full compliance with European grid connection requirements, including harmonic limits and voltage regulation<\/li>\n<li><strong>Containerized deployment:<\/strong> Transformer footprint optimized for 20-ft ISO container installation<\/li>\n<li><strong>Delivery timeline:<\/strong> Design, manufacturing, and FAT completed in under 16 weeks<\/li>\n<\/ul>\n<p><strong>Operational Benefits:<\/strong><\/p>\n<ul>\n<li><strong>Reduced energy losses:<\/strong> The 98.2% efficiency translates to approximately 1.8% losses in the power conversion chain, improving overall system ROI<\/li>\n<li><strong>Simplified integration:<\/strong> The custom design eliminated the need for additional interface components, reducing installation time<\/li>\n<li><strong>Future scalability:<\/strong> The modular design supports future expansion of the BESS installation<\/li>\n<\/ul>\n<p>This case study demonstrates how TPS Elektronik combines expertise in power electronics, custom transformer design, and energy storage architectures to deliver end-to-end solutions for utility-scale BESS projects. By integrating custom transformer design with broader EMS capabilities, TPS ensured not only technical excellence but also regulatory compliance and long-term reliability.<\/p>\n<\/section>\n<section id=\"tps-capabilities\">\n<h2>5. TPS Custom Transformer Solutions for Energy Storage<\/h2>\n<p>TPS Elektronik&#8217;s <strong>custom transformer solutions<\/strong> for energy storage applications combine engineering expertise, manufacturing capability, and comprehensive quality assurance in a single integrated service.<\/p>\n<p><strong>Engineering &amp; Design:<\/strong><\/p>\n<ul>\n<li>Custom transformer design for BESS, PCS, and renewable energy applications<\/li>\n<li>Bidirectional power conversion optimization<\/li>\n<li>1500V DC isolation system design per IEC 60076<\/li>\n<li>Thermal management and mechanical integration<\/li>\n<li>Grid code compliance and certification support<\/li>\n<\/ul>\n<p><strong>Manufacturing Capabilities:<\/strong><\/p>\n<ul>\n<li>Precision winding and core assembly<\/li>\n<li>Reinforced insulation systems for high-voltage DC applications<\/li>\n<li>Forced-air and liquid-cooled designs<\/li>\n<li>Containerized and skid-mounted configurations<\/li>\n<li>Power ratings from kW to MW scale<\/li>\n<\/ul>\n<p><strong>Quality &amp; Compliance:<\/strong><\/p>\n<ul>\n<li>IEC 60076 transformer standards compliance<\/li>\n<li>UL 9540 and NFPA 855 for BESS applications<\/li>\n<li>Factory Acceptance Testing (FAT) per customer specifications<\/li>\n<li>Full documentation and material traceability<\/li>\n<\/ul>\n<p><strong>Integration Support:<\/strong><\/p>\n<ul>\n<li>Mechanical and electrical interface coordination with PCS<\/li>\n<li>Grid connection support and protection coordination<\/li>\n<li>Commissioning and on-site testing<\/li>\n<\/ul>\n<p>TPS supports energy storage projects of any scale, from small commercial systems to utility-scale installations exceeding 100 MW. TPS&#8217;s <strong>custom transformer solutions<\/strong> service is integrated with broader EMS capabilities\u2014including power supply design, battery testing, and energy storage architectures\u2014reducing supply chain complexity for system integrators and procurement teams.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/additional-services\/\">Request your custom transformer solutions RFQ \u2192<\/a><\/p>\n<\/section>\n<section id=\"faq\">\n<h2>6. FAQ<\/h2>\n<div>\n<div>\n<h3>What is the difference between a standard transformer and a custom energy storage transformer?<\/h3>\n<div>\n<div>A standard transformer is designed for unidirectional power flow in a fixed voltage configuration. A custom energy storage transformer is optimized for bidirectional power conversion, with symmetric winding design, low-loss core materials, and insulation systems rated for 1500V DC battery bus voltages. It is designed specifically for BESS and PCS applications.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What efficiency can TPS achieve with custom energy storage transformers?<\/h3>\n<div>\n<div>TPS custom energy storage transformers achieve bidirectional efficiency exceeding 97%, with typical measured performance of 98.2% in both charging and discharging modes. Efficiency depends on power rating, voltage levels, and specific design requirements.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What standards do TPS custom transformers comply with?<\/h3>\n<div>\n<div>TPS custom transformers are designed and manufactured per IEC 60076 transformer standards. For BESS applications, TPS also supports compliance with UL 9540 and NFPA 855 requirements, including fire-rated construction and thermal runaway containment.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>Can TPS design transformers for containerized BESS installations?<\/h3>\n<div>\n<div>Yes. TPS designs transformers specifically for containerized deployment, with optimized footprints for 20-ft and 40-ft ISO containers. Mechanical designs include seismic bracing, cable entry points, and thermal management for outdoor operation.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>What power ratings does TPS support for custom transformers?<\/h3>\n<div>\n<div>TPS supports custom transformer designs from kW to MW scale, matching the full range of BESS and PCS applications\u2014from small commercial systems to utility-scale installations exceeding 100 MW.<\/div>\n<\/div>\n<\/div>\n<div>\n<h3>Does TPS provide testing and documentation for custom transformers?<\/h3>\n<div>\n<div>Yes. TPS provides Factory Acceptance Testing (FAT) per customer specifications, including insulation resistance testing, turns ratio verification, impedance measurement, and dielectric testing. Full documentation and material traceability are provided with every transformer.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<footer style=\"background: #2d5797; padding: 30px; border-radius: 14px; margin-top: 40px;\">\n<p style=\"color: #ffffff; font-size: 16px; line-height: 1.6; margin: 0;\"><strong>Ready to achieve high-efficiency bidirectional power conversion for your utility-scale BESS project?<\/strong><br \/>Contact TPS Elektronik for custom transformer engineering, manufacturing, and integration support\u2014from design to grid-connected operation.<br \/><a style=\"color: #ffffff; font-weight: 600; text-decoration: underline;\" href=\"https:\/\/tps-elektronik.com\/en\/services\/additional-services\/\">Request your custom transformer solutions quote \u2192<\/a><\/p>\n<\/footer><\/article>\n\n<style id=\"wpforms-css-vars-4659-block-16ed1d48-c427-44d1-9d22-8ef9e0bd5af8\">\n\t\t\t\t#wpforms-4659.wpforms-block-16ed1d48-c427-44d1-9d22-8ef9e0bd5af8 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their 50 MW \/ 200 MWh battery energy storage system had to achieve bidirectional power conversion efficiency above 97% while maintaining galvanic isolation between the 1500V DC battery bus and the medium-voltage AC grid. Standard off-the-shelf transformers could not meet the combined requirements of\u2026 <a href=\"https:\/\/tps-elektronik.com\/en\/case-studies\/how-to-achieve-high-efficiency-bidirectional-power-conversion-in-utility-scale-battery-storage-with-tps-custom-energy-storage-transformer-solutions\/\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":15210,"template":"","class_list":["post-15967","case_studies","type-case_studies","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Achieve High Efficiency Bidirectional Power Conversion in Utility-Scale Battery Storage with TPS Custom Energy Storage Transformer Solutions? - TPS<\/title>\n<meta name=\"description\" content=\"Custom transformer solutions for utility-scale BESS with bidirectional power conversion, 1500V DC isolation, and grid-tied compliance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tps-elektronik.com\/en\/case-studies\/how-to-achieve-high-efficiency-bidirectional-power-conversion-in-utility-scale-battery-storage-with-tps-custom-energy-storage-transformer-solutions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Achieve High Efficiency Bidirectional Power Conversion in Utility-Scale Battery Storage with TPS Custom Energy Storage Transformer Solutions? 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