Items | Transmission Network | Distribution Network |
Topology | The general network topology is ring-shaped and needs to be analyzed as a whole. | The power supply situation is regional power supply, the network topology in the region is radial, the closed-loop design between the regions, and the open-loop operation. |
Network imbalance | The imbalance of the network is small and can basically be ignored. It can be considered that the three-phase line parameter balance and three-phase load balance can be analyzed in single-phase or positive sequence. | The three-phase line parameters are unbalanced, the R/X ratio fluctuates greatly, the three-phase load is unbalanced, and there are single-phase and two-phase loads, which cannot be analyzed independently. |
SCADA measuring device | There are a large number of real-time measurement devices and a small number of pseudo-measurements, and the measurement redundancy is high | A small amount of real-time measurement, a large number of load pseudo-measurement, from the perspective of real-time measurement, the measurement redundancy is low, and the network value is generally unobservable. |
Network scale | A typical network generally contains hundreds of buses to one or two thousand buses. | A typical network generally contains 10,000 to 100,000 nodes. |
Existing power plant | Generally, thermal power, large-scale hydropower and nuclear power generation, the output power is basically stable and adjustable with the load. | Mostly distributed DG distributed in the feeder of the distribution network, the output power fluctuates greatly, and has certain controllability. |