PATENT CLAIM ANALYSIS

Application Number: 16217492
Application Type: Utility
Filing Date: 2018-12
Publication Date: 2019-08
Patent Classification: ["363", "040000"]

Abstract:
A system and method for controlling a grid-connected inverter to provide negative sequence current during unbalanced grid operating conditions. The system uses a combination of feedforward and feedback controls to compute voltage signals which are used to control the inverter switches. The system includes both positive and negative sequence current controllers with voltage feedforward terms. The measured grid voltage is directly fed forward to the positive sequence control through a predictive algorithm, so that the instantaneous voltage information is kept, reducing the influence of grid voltage harmonics on the quality of the output current. The predictive voltages include positive, negative and harmonic component information of the grid voltage signals.

Claim (Index 12):
A method for controlling a grid-connected three phase reactive power compensation inverter to counteract unbalanced grid voltage conditions, said method comprising:\n receiving, by an inverter controller, inputs including measured three phase grid voltage signals and measured three phase grid-inverter current signals from sensors, and direct and quadrature reference current signals; computing, using a processor in the inverter controller, predictive feedforward voltages from the measured grid voltage signals, including converting three phase grid voltages to positive sequence direct and quadrature components for each measurement sample, and computing direct and quadrature predictive feedforward voltages for a next control cycle based on two measurement samples from a previous control cycle, where the measurement samples are taken at a time at an end of the previous control cycle at a time 75% through the current control cycle; performing, using the processor, control calculations using a decoupled double synchronous reference frame (DDSRF) algorithm, where the DDSRF algorithm uses the predictive feedforward voltages along with the measured and reference current signals as inputs, and the DDSRF algorithm produces a two phase alpha-beta (\u03b1\u03b2) reference voltage signal as output; converting the two phase \u03b1\u03b2 reference voltage signal to switching commands using a Space Vector pulse width modulation (PWM) algorithm; and providing the switching commands to a switch driver board in the inverter to control operation of bridge arm power switches in the inverter, where the switching commands cause the inverter to counteract the unbalanced grid voltage conditions by providing a different current amplitude to each grid phase.

Metadata:
- Claim Count in Document: 50.0
- Percentile: 98.0
- Lexical Diversity: 1.77273
- Patent Class: 363.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['16164361', '15307809', '13817524', '15218406', '14855808']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7884479163564742
- 35 USC 102 Novelty (BERT): 0.4957440263343722
- Combined Prediction Score: 0.759177527354264
- Mean Citation Score: 241.932186
- Max Citation Score: 278.62958
- Similarity Product: 256.05200611931684

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test