Grid-forming Inverter vs Grid-following: Synchronization
APR 7, 20269 MIN READ
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Grid-forming vs Grid-following Inverter Synchronization Background
The evolution of power grid infrastructure has undergone significant transformation over the past century, transitioning from centralized fossil fuel-based generation to increasingly distributed renewable energy systems. This paradigm shift has fundamentally altered the operational characteristics of electrical grids, necessitating advanced control strategies for power electronic interfaces. Traditional synchronous generators, which naturally provided grid stability through their inherent inertia and synchronizing torque, are being progressively replaced by inverter-based resources that require sophisticated control algorithms to maintain grid stability.
The emergence of renewable energy sources, particularly solar photovoltaic and wind power systems, has introduced new challenges in grid synchronization and stability management. Unlike conventional rotating machines, these resources connect to the grid through power electronic converters that must artificially replicate the stabilizing characteristics of synchronous generators. This technological transition has created an urgent need for robust inverter control strategies that can ensure reliable grid operation under varying conditions.
Grid-following inverters represent the first generation of grid-tied power electronic systems, designed to operate as current sources that synchronize with an existing strong grid voltage reference. These systems utilize phase-locked loops to track grid frequency and phase, injecting power while relying on the grid's inherent stability provided by conventional generators. This approach has proven effective in scenarios where inverter-based resources constitute a small percentage of total generation capacity.
However, as renewable energy penetration increases and conventional synchronous generators are decommissioned, grids are experiencing reduced inertia and weakened voltage support. This transition has exposed limitations of grid-following control strategies, particularly in weak grid conditions or during grid disturbances. The need for inverters to actively participate in grid stabilization has driven the development of grid-forming control technologies.
Grid-forming inverters represent an advanced control paradigm that enables power electronic systems to establish and maintain grid voltage and frequency independently, similar to conventional synchronous generators. These systems can operate autonomously in islanded conditions and provide essential grid services including voltage regulation, frequency control, and fault ride-through capabilities. The synchronization challenge between these two inverter types has become a critical research focus as power systems transition toward higher renewable energy integration levels.
The emergence of renewable energy sources, particularly solar photovoltaic and wind power systems, has introduced new challenges in grid synchronization and stability management. Unlike conventional rotating machines, these resources connect to the grid through power electronic converters that must artificially replicate the stabilizing characteristics of synchronous generators. This technological transition has created an urgent need for robust inverter control strategies that can ensure reliable grid operation under varying conditions.
Grid-following inverters represent the first generation of grid-tied power electronic systems, designed to operate as current sources that synchronize with an existing strong grid voltage reference. These systems utilize phase-locked loops to track grid frequency and phase, injecting power while relying on the grid's inherent stability provided by conventional generators. This approach has proven effective in scenarios where inverter-based resources constitute a small percentage of total generation capacity.
However, as renewable energy penetration increases and conventional synchronous generators are decommissioned, grids are experiencing reduced inertia and weakened voltage support. This transition has exposed limitations of grid-following control strategies, particularly in weak grid conditions or during grid disturbances. The need for inverters to actively participate in grid stabilization has driven the development of grid-forming control technologies.
Grid-forming inverters represent an advanced control paradigm that enables power electronic systems to establish and maintain grid voltage and frequency independently, similar to conventional synchronous generators. These systems can operate autonomously in islanded conditions and provide essential grid services including voltage regulation, frequency control, and fault ride-through capabilities. The synchronization challenge between these two inverter types has become a critical research focus as power systems transition toward higher renewable energy integration levels.
Market Demand for Advanced Grid Synchronization Solutions
The global energy landscape is experiencing unprecedented transformation driven by renewable energy integration, creating substantial market demand for advanced grid synchronization solutions. Traditional power grids, designed around centralized fossil fuel generation, face significant challenges as distributed renewable resources proliferate. This shift necessitates sophisticated synchronization technologies capable of maintaining grid stability while accommodating bidirectional power flows and variable generation patterns.
Utility companies worldwide are investing heavily in grid modernization initiatives to address synchronization challenges. The increasing penetration of solar photovoltaic systems, wind farms, and energy storage installations requires advanced inverter technologies that can seamlessly integrate with existing grid infrastructure. Grid-forming inverters represent a critical solution for microgrids and weak grid scenarios, while grid-following inverters remain essential for high renewable penetration environments.
Industrial and commercial sectors demonstrate growing demand for reliable grid synchronization solutions as power quality requirements become more stringent. Manufacturing facilities, data centers, and critical infrastructure operators require uninterrupted power supply with precise frequency and voltage control. These sectors increasingly adopt distributed energy resources and backup power systems, creating complex synchronization requirements that traditional solutions cannot adequately address.
The residential market segment shows accelerating adoption of rooftop solar installations coupled with battery storage systems. Homeowners seek energy independence while maintaining grid connectivity, driving demand for intelligent inverter systems capable of seamless transitions between grid-tied and islanded operation modes. Smart home integration and vehicle-to-grid technologies further amplify synchronization complexity requirements.
Emerging markets present significant growth opportunities as developing nations invest in modern electrical infrastructure. These regions often experience grid instability issues, making advanced synchronization solutions essential for reliable power delivery. Rural electrification projects and mini-grid deployments particularly benefit from grid-forming capabilities that enable autonomous operation in remote locations.
Regulatory frameworks increasingly mandate advanced grid support functions, creating compliance-driven market demand. Grid codes worldwide are evolving to require inverter-based resources to provide ancillary services including frequency regulation, voltage support, and fault ride-through capabilities. These regulatory requirements drive technology adoption across all market segments, establishing advanced synchronization as a fundamental requirement rather than optional enhancement.
Utility companies worldwide are investing heavily in grid modernization initiatives to address synchronization challenges. The increasing penetration of solar photovoltaic systems, wind farms, and energy storage installations requires advanced inverter technologies that can seamlessly integrate with existing grid infrastructure. Grid-forming inverters represent a critical solution for microgrids and weak grid scenarios, while grid-following inverters remain essential for high renewable penetration environments.
Industrial and commercial sectors demonstrate growing demand for reliable grid synchronization solutions as power quality requirements become more stringent. Manufacturing facilities, data centers, and critical infrastructure operators require uninterrupted power supply with precise frequency and voltage control. These sectors increasingly adopt distributed energy resources and backup power systems, creating complex synchronization requirements that traditional solutions cannot adequately address.
The residential market segment shows accelerating adoption of rooftop solar installations coupled with battery storage systems. Homeowners seek energy independence while maintaining grid connectivity, driving demand for intelligent inverter systems capable of seamless transitions between grid-tied and islanded operation modes. Smart home integration and vehicle-to-grid technologies further amplify synchronization complexity requirements.
Emerging markets present significant growth opportunities as developing nations invest in modern electrical infrastructure. These regions often experience grid instability issues, making advanced synchronization solutions essential for reliable power delivery. Rural electrification projects and mini-grid deployments particularly benefit from grid-forming capabilities that enable autonomous operation in remote locations.
Regulatory frameworks increasingly mandate advanced grid support functions, creating compliance-driven market demand. Grid codes worldwide are evolving to require inverter-based resources to provide ancillary services including frequency regulation, voltage support, and fault ride-through capabilities. These regulatory requirements drive technology adoption across all market segments, establishing advanced synchronization as a fundamental requirement rather than optional enhancement.
Current Synchronization Challenges in Grid-tied Inverters
Grid-tied inverters face significant synchronization challenges that directly impact power system stability and reliability. The fundamental challenge lies in maintaining precise phase, frequency, and voltage alignment with the grid while managing dynamic operating conditions and disturbances. Traditional grid-following inverters rely heavily on phase-locked loops (PLLs) for synchronization, which can introduce stability issues under weak grid conditions or during grid disturbances.
Phase-locked loop limitations represent a critical synchronization challenge in grid-following systems. PLLs can exhibit poor performance during grid voltage unbalance, harmonic distortion, or frequency variations. The bandwidth selection for PLLs creates a trade-off between tracking accuracy and noise rejection, often resulting in compromised performance during transient conditions. Additionally, PLL-based synchronization can contribute to system instability when multiple inverters interact, particularly in weak grid scenarios where grid impedance is high.
Weak grid conditions pose substantial synchronization difficulties for conventional grid-tied inverters. When the short-circuit ratio falls below critical thresholds, the grid voltage becomes highly sensitive to inverter current injections, creating feedback loops that can destabilize the synchronization process. This sensitivity is exacerbated by the inherent delay in PLL response, which can lead to oscillatory behavior and potential loss of synchronization during grid disturbances.
Grid disturbances and fault conditions present another layer of synchronization complexity. During voltage sags, phase jumps, or frequency excursions, grid-following inverters must maintain synchronization while adhering to grid codes that require continued operation through specific disturbance profiles. The challenge intensifies when multiple inverters respond simultaneously to grid events, potentially creating collective instability that propagates throughout the power system.
The increasing penetration of renewable energy sources introduces additional synchronization challenges related to reduced system inertia and weakened grid strength. As conventional synchronous generators are displaced, the grid becomes more susceptible to frequency and voltage fluctuations, making precise synchronization more critical yet more difficult to achieve. This transition necessitates advanced synchronization strategies that can maintain stability in low-inertia environments.
Harmonic distortion and power quality issues further complicate synchronization efforts in modern power systems. Grid-tied inverters must maintain synchronization despite the presence of background harmonics, inter-harmonics, and other power quality disturbances that can interfere with traditional synchronization algorithms. The challenge is particularly acute in industrial environments or areas with high concentrations of non-linear loads.
Phase-locked loop limitations represent a critical synchronization challenge in grid-following systems. PLLs can exhibit poor performance during grid voltage unbalance, harmonic distortion, or frequency variations. The bandwidth selection for PLLs creates a trade-off between tracking accuracy and noise rejection, often resulting in compromised performance during transient conditions. Additionally, PLL-based synchronization can contribute to system instability when multiple inverters interact, particularly in weak grid scenarios where grid impedance is high.
Weak grid conditions pose substantial synchronization difficulties for conventional grid-tied inverters. When the short-circuit ratio falls below critical thresholds, the grid voltage becomes highly sensitive to inverter current injections, creating feedback loops that can destabilize the synchronization process. This sensitivity is exacerbated by the inherent delay in PLL response, which can lead to oscillatory behavior and potential loss of synchronization during grid disturbances.
Grid disturbances and fault conditions present another layer of synchronization complexity. During voltage sags, phase jumps, or frequency excursions, grid-following inverters must maintain synchronization while adhering to grid codes that require continued operation through specific disturbance profiles. The challenge intensifies when multiple inverters respond simultaneously to grid events, potentially creating collective instability that propagates throughout the power system.
The increasing penetration of renewable energy sources introduces additional synchronization challenges related to reduced system inertia and weakened grid strength. As conventional synchronous generators are displaced, the grid becomes more susceptible to frequency and voltage fluctuations, making precise synchronization more critical yet more difficult to achieve. This transition necessitates advanced synchronization strategies that can maintain stability in low-inertia environments.
Harmonic distortion and power quality issues further complicate synchronization efforts in modern power systems. Grid-tied inverters must maintain synchronization despite the presence of background harmonics, inter-harmonics, and other power quality disturbances that can interfere with traditional synchronization algorithms. The challenge is particularly acute in industrial environments or areas with high concentrations of non-linear loads.
Existing Grid Synchronization Control Strategies
01 Grid-forming inverter control strategies for synchronization
Grid-forming inverters utilize advanced control strategies to establish and maintain synchronization with the grid. These strategies include voltage and frequency control methods that enable the inverter to act as a voltage source, creating its own grid reference. The control algorithms incorporate droop control, virtual synchronous machine concepts, and phase-locked loop alternatives to ensure stable synchronization during grid connection and islanded operation modes.- Grid-forming inverter control strategies for synchronization: Grid-forming inverters utilize advanced control strategies to establish and maintain synchronization with the grid. These control methods enable the inverter to act as a voltage source, creating its own voltage and frequency references independently. The control strategies include virtual synchronous machine algorithms, droop control mechanisms, and voltage-frequency regulation techniques that allow the inverter to provide grid support and maintain stable operation during grid disturbances.
- Grid-following inverter synchronization techniques: Grid-following inverters employ phase-locked loop systems and synchronization algorithms to track and follow the existing grid voltage and frequency. These inverters operate as current sources and require a stable grid reference for proper operation. The synchronization techniques include enhanced phase detection methods, frequency tracking algorithms, and grid parameter estimation to ensure accurate alignment with grid conditions.
- Hybrid synchronization methods combining grid-forming and grid-following modes: Advanced inverter systems incorporate hybrid synchronization approaches that can seamlessly transition between grid-forming and grid-following modes based on grid conditions. These methods enable flexible operation where the inverter can support weak grids by operating in grid-forming mode or efficiently connect to strong grids in grid-following mode. The transition mechanisms include mode detection algorithms and smooth switching protocols to prevent disturbances during mode changes.
- Synchronization stability enhancement during grid disturbances: Specialized techniques are implemented to maintain synchronization stability during grid faults, voltage sags, and frequency deviations. These methods include adaptive control parameters, fault ride-through capabilities, and dynamic response mechanisms that allow inverters to remain synchronized during abnormal grid conditions. The stability enhancement approaches utilize real-time grid monitoring and predictive control algorithms to anticipate and respond to disturbances.
- Multi-inverter synchronization and coordination: When multiple inverters operate in parallel, coordination mechanisms are required to ensure proper synchronization among all units and with the grid. These coordination strategies include distributed control architectures, communication protocols for information exchange, and consensus algorithms that enable multiple inverters to operate harmoniously. The methods address power sharing, voltage regulation, and frequency synchronization across multiple inverter units in both islanded and grid-connected modes.
02 Grid-following inverter synchronization techniques
Grid-following inverters employ synchronization techniques that track the existing grid voltage and frequency to maintain proper phase alignment. These techniques typically utilize phase-locked loops and grid voltage detection methods to synchronize the inverter output with the grid parameters. The synchronization process ensures that the inverter operates as a current source, injecting power into the grid while following its voltage and frequency characteristics.Expand Specific Solutions03 Transition and mode switching between grid-forming and grid-following operations
Advanced inverter systems incorporate seamless transition mechanisms that allow switching between grid-forming and grid-following modes based on grid conditions. These transition strategies include detection algorithms for grid presence, smooth handover protocols, and adaptive control parameters that adjust according to the operational mode. The switching capability enhances system flexibility and reliability during various grid scenarios including fault conditions and islanding events.Expand Specific Solutions04 Synchronization stability enhancement methods
Various methods are employed to enhance synchronization stability in both grid-forming and grid-following inverters. These include damping control techniques, virtual impedance implementation, and adaptive gain adjustment mechanisms. The stability enhancement approaches address issues such as oscillations, resonance, and transient disturbances that can affect synchronization performance. Advanced filtering and signal processing techniques are also utilized to improve robustness against grid disturbances.Expand Specific Solutions05 Multi-inverter parallel operation and synchronization coordination
When multiple inverters operate in parallel, coordination strategies are essential for maintaining synchronized operation. These strategies include distributed control architectures, communication-based synchronization protocols, and hierarchical control structures. The coordination methods ensure proper load sharing, prevent circulating currents, and maintain system stability when multiple grid-forming and grid-following inverters operate simultaneously in the same network.Expand Specific Solutions
Key Players in Grid-forming Inverter Industry
The grid-forming versus grid-following inverter synchronization technology represents a rapidly evolving sector within the power electronics industry, currently in a transitional phase from traditional grid-following to advanced grid-forming capabilities. The market is experiencing significant growth driven by increasing renewable energy integration and grid stability requirements. Technology maturity varies considerably among key players, with established companies like ABB Ltd., Siemens Energy, and General Electric leading in grid-forming innovations, while Asian manufacturers including Sungrow Power Supply, Huawei Digital Power Technologies, and SMA Solar Technology are advancing rapidly in both grid-following and grid-forming solutions. Research institutions such as Sichuan University and Zhejiang University contribute to fundamental synchronization algorithms, while emerging players like Pion Electric specialize in grid-forming inverter technologies, indicating a competitive landscape where traditional power equipment manufacturers compete alongside specialized inverter companies and technology innovators.
ABB Ltd.
Technical Solution: ABB has developed advanced grid-forming inverter technology with enhanced synchronization capabilities through their PowerStore and PCS100 systems. Their grid-forming inverters utilize virtual synchronous machine (VSM) control algorithms that provide inherent grid stabilization by mimicking the inertial response of traditional synchronous generators. The technology incorporates sophisticated phase-locked loop (PLL) systems for grid-following mode and seamless transition capabilities between grid-forming and grid-following operations. ABB's solution includes adaptive synchronization mechanisms that can detect grid conditions and automatically switch between operational modes, ensuring optimal performance during grid disturbances, islanding scenarios, and reconnection events.
Strengths: Proven track record in large-scale deployments, robust transition algorithms, comprehensive grid support functions. Weaknesses: Higher complexity in control systems, potentially higher costs for smaller applications.
Hitachi Energy Ltd.
Technical Solution: Hitachi Energy has developed grid-forming inverter solutions focusing on microgrid applications and renewable energy integration. Their technology employs droop control mechanisms combined with virtual inertia algorithms to provide grid-forming capabilities. The synchronization approach utilizes advanced control strategies that enable smooth transitions between islanded and grid-connected modes. Their PowerGrip and e-mesh solutions incorporate real-time grid monitoring and adaptive synchronization protocols that can handle multiple distributed energy resources simultaneously. The system features enhanced fault ride-through capabilities and provides ancillary services including frequency regulation and voltage support through coordinated control of multiple inverters in a microgrid environment.
Strengths: Strong microgrid expertise, excellent fault tolerance, coordinated multi-inverter control. Weaknesses: Limited presence in utility-scale applications, newer market entrant compared to established competitors.
Core Innovations in Grid-forming Synchronization Methods
Grid-forming inverter synchronization for connection to a power grid
PatentWO2017069746A1
Innovation
- A grid-forming inverter system with an electronic controller that determines a voltage magnitude reference and phase angle reference during an inactive mode, allowing the inverter to synchronize with the power grid without a synchronization switch by using a phase locked loop and pulse width modulation to set an initial voltage, eliminating the need for additional hardware.
Method for operating electric power converter and electric power converter
PatentPendingEP4383536A1
Innovation
- The method involves controlling controllable power semiconductor switches to operate at a lower switching frequency during short-circuit faults, reducing losses and enabling higher short-circuit current supply without altering the converter's dimensioning.
Grid Code Compliance for Inverter Synchronization
Grid code compliance represents a critical regulatory framework that governs how inverters must synchronize with electrical grids, establishing mandatory technical requirements for both grid-forming and grid-following inverters. These regulations have evolved significantly as renewable energy penetration increases, necessitating more sophisticated synchronization standards to maintain grid stability and reliability.
Traditional grid codes were primarily designed for grid-following inverters, which rely on existing grid voltage and frequency references for synchronization. These standards typically specify phase-locked loop performance requirements, voltage and frequency operating ranges, and fault ride-through capabilities. Grid-following inverters must demonstrate compliance with IEEE 1547, IEC 61727, and regional standards such as the European Network Code Requirements for Generators.
Grid-forming inverters face more complex compliance challenges due to their autonomous operation capabilities. Recent grid code updates, including IEEE 1547-2018 and emerging IEC standards, now address grid-forming functionality requirements. These regulations specify voltage source characteristics, frequency regulation capabilities, and black-start procedures that grid-forming inverters must satisfy during synchronization events.
Synchronization compliance testing involves rigorous validation of inverter behavior during various grid conditions. Grid-following inverters must demonstrate proper phase tracking, frequency response, and seamless reconnection after disturbances. Grid-forming inverters undergo additional testing for voltage establishment, frequency setting accuracy, and coordination with other grid-forming sources during parallel operation.
Regional variations in grid codes create additional complexity for inverter manufacturers and system integrators. European ENTSO-E requirements differ significantly from North American NERC standards, particularly regarding synchronization timing, voltage regulation, and fault response characteristics. These differences necessitate adaptive inverter designs capable of meeting multiple regulatory frameworks.
Emerging grid code developments increasingly recognize the need for hybrid synchronization capabilities, where inverters can transition between grid-forming and grid-following modes based on grid conditions. Future compliance frameworks are expected to mandate seamless mode transitions, enhanced grid support functions, and improved coordination mechanisms for high renewable energy penetration scenarios.
Traditional grid codes were primarily designed for grid-following inverters, which rely on existing grid voltage and frequency references for synchronization. These standards typically specify phase-locked loop performance requirements, voltage and frequency operating ranges, and fault ride-through capabilities. Grid-following inverters must demonstrate compliance with IEEE 1547, IEC 61727, and regional standards such as the European Network Code Requirements for Generators.
Grid-forming inverters face more complex compliance challenges due to their autonomous operation capabilities. Recent grid code updates, including IEEE 1547-2018 and emerging IEC standards, now address grid-forming functionality requirements. These regulations specify voltage source characteristics, frequency regulation capabilities, and black-start procedures that grid-forming inverters must satisfy during synchronization events.
Synchronization compliance testing involves rigorous validation of inverter behavior during various grid conditions. Grid-following inverters must demonstrate proper phase tracking, frequency response, and seamless reconnection after disturbances. Grid-forming inverters undergo additional testing for voltage establishment, frequency setting accuracy, and coordination with other grid-forming sources during parallel operation.
Regional variations in grid codes create additional complexity for inverter manufacturers and system integrators. European ENTSO-E requirements differ significantly from North American NERC standards, particularly regarding synchronization timing, voltage regulation, and fault response characteristics. These differences necessitate adaptive inverter designs capable of meeting multiple regulatory frameworks.
Emerging grid code developments increasingly recognize the need for hybrid synchronization capabilities, where inverters can transition between grid-forming and grid-following modes based on grid conditions. Future compliance frameworks are expected to mandate seamless mode transitions, enhanced grid support functions, and improved coordination mechanisms for high renewable energy penetration scenarios.
Grid Stability Impact of Inverter Synchronization Methods
The synchronization methods employed by grid-forming and grid-following inverters fundamentally alter power system stability characteristics through distinct control philosophies and dynamic responses. Grid-following inverters, which constitute the majority of current renewable energy installations, rely on phase-locked loops (PLLs) to synchronize with the existing grid voltage and frequency. This dependency creates inherent stability limitations, particularly as inverter penetration increases and traditional synchronous generators are displaced.
Grid-forming inverters establish their own voltage and frequency references, operating independently of grid synchronization signals. This autonomous behavior enables them to provide essential grid services including voltage support, frequency regulation, and fault ride-through capabilities. However, the transition from grid-following to grid-forming operation introduces new stability challenges related to virtual impedance control, droop characteristics, and inter-inverter synchronization.
The stability impact becomes particularly pronounced during grid disturbances when multiple inverters must maintain coordinated operation. Grid-following inverters may experience synchronization loss during voltage sags or frequency excursions, potentially leading to cascading disconnections. Conversely, grid-forming inverters can maintain stability during such events but may exhibit oscillatory behavior when interacting with other grid-forming units or weak grid conditions.
Transient stability analysis reveals that grid-forming inverters generally provide superior performance during large disturbances due to their ability to maintain voltage and frequency control without external reference signals. However, small-signal stability can be compromised when multiple grid-forming inverters operate in proximity without proper coordination mechanisms.
The integration of both synchronization methods within the same network creates complex interaction dynamics. Grid-forming inverters can provide the voltage and frequency references that grid-following units require, potentially enabling higher renewable penetration levels. However, the control parameter settings and coordination strategies must be carefully optimized to prevent adverse interactions that could compromise overall system stability and reliability.
Grid-forming inverters establish their own voltage and frequency references, operating independently of grid synchronization signals. This autonomous behavior enables them to provide essential grid services including voltage support, frequency regulation, and fault ride-through capabilities. However, the transition from grid-following to grid-forming operation introduces new stability challenges related to virtual impedance control, droop characteristics, and inter-inverter synchronization.
The stability impact becomes particularly pronounced during grid disturbances when multiple inverters must maintain coordinated operation. Grid-following inverters may experience synchronization loss during voltage sags or frequency excursions, potentially leading to cascading disconnections. Conversely, grid-forming inverters can maintain stability during such events but may exhibit oscillatory behavior when interacting with other grid-forming units or weak grid conditions.
Transient stability analysis reveals that grid-forming inverters generally provide superior performance during large disturbances due to their ability to maintain voltage and frequency control without external reference signals. However, small-signal stability can be compromised when multiple grid-forming inverters operate in proximity without proper coordination mechanisms.
The integration of both synchronization methods within the same network creates complex interaction dynamics. Grid-forming inverters can provide the voltage and frequency references that grid-following units require, potentially enabling higher renewable penetration levels. However, the control parameter settings and coordination strategies must be carefully optimized to prevent adverse interactions that could compromise overall system stability and reliability.
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