Coordination control strategy for three‐port SNOP based on FCS‐MPC

Peng, Bo; Zhang, Guorong

doi:10.1049/joe.2018.8645

Cited by 10 publications

(6 citation statements)

References 18 publications

(19 reference statements)

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“…The small-signal state equation of SNOP can be written as (1) where A is a (10n+1)×(10n+1) square matrix, and each element in A is calculated as (2) where i=1,2,…,10n+1；j=1,2,…,10n+1. where B is a (10n+1)×2n matrix, and each element in B is calculated as (3) where j'=1,2,…,2n. Since the variables in the state equation have been linearized, the two equations above are equivalent to extracting the coefficients of each state variable and the input variable.…”

Section: Snop Aims To Replace Traditional Normally Open Point (Nop)mentioning

confidence: 99%

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General Small-Signal Modeling and Parameter Optimization of the Soft Normally-Open Point Connected to the Distribution Network

et al. 2021

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The soft normally-open point (SNOP) is a multi-terminal power electronic device installed between two or more feeders in the low and medium voltage distribution network, which can adjust the active power and reactive power between the feeders. A small-signal model of SNOP connected to the distribution network is established. The model includes the linearization equations of the AC system, voltage source converter, control system and internal DC system. State space is used to describe the small-signal model. The state matrix of SNOP is derived, which is not limited by the strength of AC system and the number of terminals. The objective function of control parameter optimization is established according to the characteristic roots of the state matrix. Taking a three-terminal system as an example, the characteristic roots of the state matrix are calculated and the stability of the system can be judged. The accuracy of the model is verified by the comparison of the electromagnetic transient model and the small-signal model, and the parameter optimization method is verified by the time domain simulation.

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Section: Snop Aims To Replace Traditional Normally Open Point (Nop)mentioning

confidence: 99%

“…Compared to the traditional NOP, SNOP enables normalized closed-loop operation of the feeders, improving the operating efficiency of the distribution network [3]- [5]. It has better performance of power flow regulation.…”

Section: Introductionmentioning

confidence: 99%

General Small-Signal Modeling and Parameter Optimization of the Soft Normally-Open Point Connected to the Distribution Network

et al. 2021

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“…en, they are input into the prediction function (equation ( 14)), and the predicted current value of i p 1 (k + 1) can be obtained. According to (24), when the vector angle compensation method is used to compensate the power network voltage vector E 1 (k) of time k, the voltage vector E 1 (k + 1) of time k + 1 can be obtained. e reference voltage vector can be obtained by inputting the reference current value, current prediction value, and grid voltage prediction value into the prediction function with delay compensation (equation ( 17)).…”

Section: U DC Q Controlmentioning

confidence: 99%

“…FCS-MPC is widely used in inverters, rectifiers, permanent magnet synchronous machine, and modular multilevel converters [17][18][19][20][21][22][23], but rarely in the three-port SOP. Peng et al proposed a three-port SOP coordinated control strategy based on FCS-MPC [24]. Although FCS-MPC has a faster dynamic response speed and better output power quality, it also has some problems such as a large amount of calculation and delay in current prediction.…”

Section: Introductionmentioning

confidence: 99%

An Improved Model Predictive Control Method for Three-Port Soft Open Point

Wang

Sheng

Huo

et al. 2021

Mathematical Problems in Engineering

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Soft open point (SOP) is a key power electronic device to improve the flexibility and stability of the distribution network and is becoming a research hotspot. The traditional double closed-loop control of SOP has a complex structure, difficult process of parameter design, and poor output power quality. To solve these problems, finite control set model predictive control (FCS-MPC) has been adopted. Since FCS-MPC involves a large amount of calculation and experiences delay in current tracking, an improved FCS-MPC with delay compensation is proposed for three-port SOP in this paper to replace the inner loop current control strategy. Improved model predictive control combines the two-step prediction method based on the voltage vector and vector angle compensation method. The vector method is used to construct a mathematical model and a prediction model of three-port SOP. Based on FCS-MPC, the two-step prediction method that takes voltage as the target is used to compensate for the current delay problem, and the amount of calculation is reduced by converting the control target. Meanwhile, the vector angle compensation method is used to compensate the future reference value. Finally, a simulation model is built in MATLAB/Simulink. The simulation results under steady state and dynamic conditions show that the proposed strategy can effectively improve the current delay and reduce the amount of calculation. Furthermore, it has better current tracking accuracy and faster dynamic response speed.

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“…The FMSS can adjust the power flow flexibly for sack of their flexible control strategies and fast response speeds. By connecting multiple power supply feeders, the multi-port FMSS can meet the power supply requirements in different scenarios such as multiple voltage levels and multiple power supply areas in a distribution network [9,10]. The basic working principle and typical working modes of FMSS are analyzed in reference [11].…”

Section: Introductionmentioning

confidence: 99%

A voltage support control strategy based on three-port flexible multi-state switch in distribution networks

Peng¹,

Zhang²

2020

Plasma Sci. Technol.

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Voltage sags in power system may lead to serious problems such as the off-grid of distributed generation and electrical equipment failures. As a novel type of power electronic equipment, a flexible multi-state switch (FMSS) is capable to support the voltage during the grid faults. In this paper, a voltage control strategy to support the voltage in a distribution network is proposed by introducing three-port FMSS. The positive-negative-sequence compensation (PNSC) scheme is adopted to control the active and reactive current. This control scheme eliminates active power oscillations at the port of voltage sags and reduces coupling oscillations of other ports. Based on the characteristics of the voltage support under PNSC scheme, two voltage support strategies are proposed. A proportional-integral controller is introduced to provide the reactive power references, which eliminates the errors when estimating the grid voltage and impedance. A current limiting scheme is adopted to keep the port current in a safe range by adjusting the active and reactive power references. The voltage support strategies in two different voltage sags are simulated, and results show the feasibility and effectiveness of the proposed control strategies.

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Coordination control strategy for three‐port SNOP based on FCS‐MPC

Cited by 10 publications

References 18 publications

General Small-Signal Modeling and Parameter Optimization of the Soft Normally-Open Point Connected to the Distribution Network

General Small-Signal Modeling and Parameter Optimization of the Soft Normally-Open Point Connected to the Distribution Network

An Improved Model Predictive Control Method for Three-Port Soft Open Point

A voltage support control strategy based on three-port flexible multi-state switch in distribution networks

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