Germany's new code for generation plants connected to medium-voltage networks and its repercussion on inverter control

Abstract

Abstract. This paper offers an overview of Germany's new code for generation plants connected to medium-voltage networks. It describes the most important requirements and how inverters may implement most of them without excessive changes in hardware. The analysis is based on the three-phase B6-topology voltage source inverter controlled by a Space Vector Modulation technique.

Adaptive Zone Identification for Voltage Level Control in Distribution Networks With DG

“…It was found that the voltage magnitude and angle ( and ) are state variables that change according to and perturbations at a specific DG bus. The sensitivity matrix can be written as (1) The subsensitivity matrices and represent the change in the bus's voltage magnitude due to a change in and injection at a DG bus, respectively. Each submatrix has size, where is the number of buses in the network.…”

“…provide decentralized voltage control in medium-voltage distribution networks [1]. At present, most DG units do not participate in active voltage control and conventional centralized control is performed by the on-load tap changer (OLTC), or capacitor banks at the substation [2].…”

Short circuit calculation in networks with a high share of inverter based distributed generation

“…In the first case, the contribution of the DG to the fault is assumed to be in line with the German Grid Code requirements for distribution networks [8]. The required reactive current depends on the voltage and is given by the curve seen in Figure 5.…”

“…The fault ride through (FRT) requirements of the German Grid Code for inverter based DG connected to the distribution network are illustrated in Figure 8 and can be summarized as follows [8]:…”

Coordinated voltage control between wind power plant and shunt capacitors in weak distribution networks

“…full converter synchronous generator or doubly-fed induction generator) can give the fast voltage controllability, which is similar the using of D-STATCOM [2]. Moreover, the Q support from the generation plant interfaced converter is already enforced by Grid Codes in some countries such as Germany [3], to provide either steady-state or dynamic voltage control in distribution networks.…”