Distributed Compensator Control for Phase Fault Bypass Balance
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Solution Overview
Problem
Existing distributed compensator systems lack flexible and coordinated control methods to handle module faults in phases, leading to unbalanced disturbances in the alternating-current power grid.
Innovation Solution
A coordinated control method and system for distributed compensators that includes real-time monitoring and hot standby state conversion of modules to maintain balanced control across all phases, even when a module in one phase fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a module fault occurs in one phase of the distributed compensator, then the faulty module needs to be bypassed to maintain operation, but this causes unbalanced disturbance to the alternating-current power grid
Solution Approach 1:
The patent applies preliminary action by pre-configuring hot standby modules in each phase before faults occur. When a module fault is detected, the system immediately switches to the pre-prepared hot standby module, avoiding unbalanced disturbances. This is implemented through real-time monitoring of module states and automatic switching mechanisms that activate standby modules proactively rather than reactively.
Solution Approach 2:
The patent changes the operational state parameter of modules from normal operation to hot standby state dynamically. By adjusting the state parameters of power electronic modules between different operational modes (normal, standby, blocked), the system maintains balanced three-phase operation even when individual modules fail, thus resolving the contradiction between reliability and grid balance.
2Device complexity
If the distributed compensator uses simple component on-site control mode, then the control system is simpler, but the control flexibility and power flow adjustment performance are insufficient
Solution Approach 1:
The patent segments the control system into multiple independent functional modules: state monitoring module, state determination module, and switching control module. Each phase's modules are independently controllable, allowing flexible combination and coordination. This segmentation enables the system to achieve complex coordinated control functions while maintaining relatively simple individual component structures, resolving the contradiction between system simplicity and control flexibility.
Solution Approach 2:
The patent implements dynamic control by enabling real-time adjustment of module operational states based on actual system conditions. The control system dynamically determines whether modules should be in normal operation or hot standby state, and dynamically switches between states as needed. This dynamic adaptability allows the system to optimize power flow adjustment performance while maintaining manageable system complexity through automated decision-making algorithms.
3Stability of the object's composition
If multiple modules are converted to hot standby state to ensure balanced control, then the balanced control capability is improved, but the number of modules available for power output is reduced
Solution Approach 1:
The patent optimizes the parameter of module state distribution by dynamically adjusting how many modules remain in normal operation versus hot standby state. Based on real-time assessment of system balance requirements and power output needs, the control system determines the optimal number of hot standby modules per phase, achieving the best compromise between balanced control capability and power output productivity.
Data Source
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AI summary
Provided in this application are a coordinated control method and system for a distributed compensator, and a computer device and a storage medium. The method includes: assembling a distributed compensator; checking the operating state of each module of the converter in each phase; calculating the number of modules, which can effectively output voltages, of the distributed compensator; performing blocking and bypassing in a case that each module has a fault; and converting the state of a module, which needs to be subjected to conversion, into a hot standby state.