Reactive Energy Compensator DC Voltage Regulation Flickering
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Solution Overview
Problem
Reactive energy compensators in alternating electric networks experience flickering issues due to electromagnetic perturbations and changes in power consumption, such as those from arc furnaces and motors, which affect the quality of electric power delivery.
Innovation Solution
A reactive energy compensator with regulation means that determines a target active current to control the input DC voltage relative to a reference value, using a transfer function that varies with the DC voltage, and generates control signals to adjust the inverter switches, thereby reducing flickering phenomena by compensating for reactive energy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive energy compensator is connected to alternating electric network, then reactive power compensation is achieved, but flickering phenomenon occurs due to electromagnetic perturbations and power changes
Solution Approach 1:
The patent implements feedback control by continuously monitoring the DC voltage on the bus and adjusting the active current reference accordingly. The control system uses the measured DC voltage to dynamically adjust the active power extraction from the network, creating a closed-loop control that stabilizes the DC voltage and reduces flickering effects on the compensated reactive power.
Solution Approach 2:
The patent changes the operating parameters of the compensator by dynamically adjusting the active current reference based on the DC voltage level. When DC voltage deviates from nominal values, the system modifies the active power extraction parameter to maintain voltage stability, thereby reducing flickering while maintaining effective reactive power compensation.
2Stability of the object's composition
If active current is increased to regulate DC voltage, then DC voltage stability is improved, but active power consumption from network increases
Solution Approach 1:
The patent applies partial action by extracting only the necessary amount of active power required to stabilize the DC voltage, rather than continuously extracting maximum active power. The active current reference is dynamically adjusted to provide just enough active power to maintain DC voltage within acceptable ranges, minimizing unnecessary energy consumption while ensuring voltage stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces flickering events in the network while maintaining stable DC voltage, improving the power quality by actively managing reactive energy and active current to counteract fluctuations.
Implementation Method 1
at least one inverter connected to the DC voltage bus and including controllable electronic switches capable of converting the input DC voltage into an intermediate alternating voltage including M phase(s)
Implementation Method 2
regulation means, adapted for determining the value of a target active current circulating between the inverter and the network capable of regulating the input direct current voltage relatively to a set reference value
Data Source
AI summary
A reactive energy compensator (10) comprising:an input DC voltage (Vc) bus (13) capable of providing reactive energy;an inverter (18) connected to the DC voltage bus (13) and including controllable electronic switches (34) capable of converting the input DC voltage (Vc) into an intermediate alternating voltage,a device (22) for controlling the electronic switches,regulation means (22) for determining a value of a target active current circulating between the inverter and the network, capable of regulating the input direct current voltage (Vc) relatively to a set reference value;the device for controlling the switches, determining control signals according to the value of said target active current, determined from the error between the reference value and the square of the DC voltage of the bus via a transfer function, the definition of which varies according to the current value of said DC voltage.