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For future active distribution grids the design of the measurement infrastructure is a critical element for an effective control and operation. The use of accurate and real-time measurements from heterogeneous existing and emerging metering devices offers a new paradigm for the distribution grid monitoring system. In a previous work, the authors proposed a meter placement procedure that allows for an optimization of the metering infrastructure for distribution system state estimation (DSSE) satisfying given estimation error bounds, while keeping into account different accuracies and costs of Phasor Measurement Units (PMUs) and smart metering devices as well as different network configurations of the future active distribution grids. In this paper the investigations are extended to the optimal meter placement by considering the characteristics variable over time of loads and generation from renewable sources. The DSSE based on the resulting metering infrastructure is then able to achieve the given accuracy constraint under the time varying and uncertain behavior of the loads and renewable generation.