IET-ESI最新原创论文|脆弱中压配电网中分布式发电自适应Q(U)控制

本文针对分布式电源（distributed generation , DG）逆变器的无功功率参与脆弱中压配电网络电压调节开展研究。基于无功功率的电压调节，也称为Q(U)控制方法，广泛应用于电网的电压调节中。但如何确定其控制参数以获得最佳性能是该方法的主要挑战。为此，本文提出了一种将自适应功能整合到典型的Q(U)控制中的中压配电网电压控制方法，这一方法的实施，可获得优于固定参数Q(U)控制的性能，控制效果可与集中式电压控制相媲美，而无需依赖于通信设施的性能。

This study seeks to exploit the reactive power capability of inverter-based distributed generation (DG) to solve the voltageregulation challenges associated with weak mediumvoltage distribution networks in developing countries. Voltage-dependent reactive power control, also known as the Q(U) control method, is widely used for voltage regulation. The challenge with this control mode, however, is determining its control parameters, which must be unique for each bus for optimal performance compared with implementing standardised or general parameters. This paper proposes an innovative approach to incorporate an adaptive functionality into the typical Q(U) control to enhance its performance in medium-voltage grids. This concept, when implemented, achieved better performance than that of the Q(U) control with fixed parameters, which was unsatisfactory under certain conditions, and performance comparable to that of the centralised voltage scheme, which relies on communication facilities.

Keywords：

autonomous adaptive, weak medium-voltage, distribution grids, distributed generation, adaptive functionality

FIGURE 1 Schematic of a typical Q(U) control

FIGURE 2 Two-bus system

FIGURE 3 Flowchart for Q(U) with adaptive functionality

FIGURE 4 Centralised voltage-control flowchart

FIGURE 5 16-Bus medium-voltage distribution network

FIGURE 6 Typical Ghanaian demand and photovoltaic active power profile

FIGURE 7 Surface fitting for voltage, active power and reactive power for distributed generation at bus 11

FIGURE 8 Results for (a) reactive power compensation by distributed generation and (b) voltage profile for the period at bus 11

FIGURE 9 Results for voltage profile at buses 11, 10, 13, 16 and 7

FIGURE 10 Results for reactive power compensation by inverters for the period at buses 11, 10, 13, 16 and 7

FIGURE 11 Results for voltage profile for Q(U)adap, Q(U)fix and centralised voltage control (CVC) at buses (a) 11, (b) 10, (c) 16 and (d) 7

FIGURE 12 Results of reactive power compensation by distributed generation for Q(U)adap, Q(U)fix and centralised voltage control (CVC) at buses (a) 11, (b) 10, (c) 16 and (d) 7

FIGURE 13 Results for voltage profile at buses 11, 10, 13, 16 and 7 after 10% increase in distributed generation and load

FIGURE 14 Results for reactive power compensation by inverters for the period at buses 11, 10, 13, 16 and 7 after 10% increase in distributed generation and load

FIGURE 15 Results for voltage profile at buses 11, 10, 13, 16 and 7 after 10% increase in line impedance

FIGURE 16 Results for reactive power compensation by inverters for the period at buses 11, 10, 13, 16 and 7 after 10% increase in line impedance