Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters

Chen-wen CHENG; Heng NIAN; Long-qi LI

doi:10.1631/FITEE.1601874

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Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters

Regular Papers | Updated：2022-05-19

- Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters
- 用于并网逆变器的改进三矢量无差拍模型预测直接功率控制策略
- Frontiers of Information Technology & Electronic Engineering Vol. 19, Issue 11, Pages: 1420-1431(2018)
- Affiliations：
  
  College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
- Author bio：
  
  Heng NIAN, E-mail: nianheng@zju.edu.cn
- Funds：
- DOI：10.1631/FITEE.1601874
  CLC： TM464
- Received：29 December 2016，
  
  Revised：2018-11-26，
  
  Published：2018-11
- Accepted：
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Chen-wen CHENG, Heng NIAN, Long-qi LI. Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters[J]. Frontiers of Information Technology & Electronic Engineering, 2018, 19(11): 1420-1431.
DOI：

Chen-wen CHENG, Heng NIAN, Long-qi LI. Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters[J]. Frontiers of Information Technology & Electronic Engineering, 2018, 19(11): 1420-1431. DOI： 10.1631/FITEE.1601874.

摘要

用于并网逆变器的传统模型预测直接功率控制，在每个控制周期只使用一个逆变器电压矢量，导致并网电流和功率出现大量谐波分量，降低电能质量。为提高稳态性能，预测控制需要很高的采样频率，同时由于计算复杂，预测算法需要较长执行时间，二者存在矛盾。为解决这个问题，提出一种新的无差拍模型预测直接功率控制策略，在每个控制周期使用2个有效电压矢量和1个零电压矢量。采用三矢量策略保证开关频率恒定，提高电流和功率质量。不同于传统三矢量模型预测直接功率控制策略，该方法根据功率误差而非电网电压矢量位置选择三个矢量，保证矢量计算时间始终为正。同时，无需迭代计算，有利于在数字信号处理芯片上执行算法。最后，搭建1 kW逆变器实验平台，验证了该方法的有效性。

Abstract

Since only one inverter voltage vector is applied during each duty cycle

traditional model predictive direct power control (MPDPC) for grid-connected inverters (GCIs) results in serious harmonics in current and power. Moreover

a high sampling frequency is needed to ensure satisfactory steady-state performance

which is contradictory to its long execution time due to the iterative prediction calculations. To solve these problems

a novel dead-beat MPDPC strategy is proposed

using two active inverter voltage vectors and one zero inverter voltage vector during each duty cycle. Adoption of three inverter vectors ensures a constant switching frequency. Thus

smooth steady-state performance of both current and power can be obtained. Unlike the traditional three-vector based MPDPC strategy

the proposed three vectors are selected based on the power errors rather than the sector where the grid voltage vector is located

which ensures that the duration times of the selected vectors are positive all the time. Iterative calculations of the cost function in traditional predictive control are also removed

which makes the proposed strategy easy to implement on digital signal processors (DSPs) for industrial applications. Results of experiments based on a 1 kW inverter setup validate the feasibility of the proposed three-vector based dead-beat MPDPC strategy.

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references

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