A reactive power optimization method for an UHV/AC/DC hybrid transmission system

Abstract

The invention relates to a reactive power optimization strategy for an UHV AC/DC hybrid transmission system, belonging to the technical field of UHV AC/DC network operation and reactive power optimization. It can effectively play the role of inhibiting transient voltage rise after DC system fault, so as to reduce the number of high-voltage off-grid fans under the condition of ensuring large-scaleDC transmission. The method comprises the following steps: step 1, obtaining steady-state operation parameters required for power flow calculation of UHV AC/DC transmission system, including power ofeach power source and load point in the system, voltage of hinge point, voltage of equilibrium point and phase angle; 2, calculating the initial power flow and the initial value of the objective function of the UHV AC/DC transmission system according to the obtained operation parameters; 3, determining an objective function and a constraint condition of the steady-state operation of the system; 4,consider that objective function and the constraint conditions of the transient characteristic, and determining the constraint conditions of the generator rotor of the reactive power optimization strategy; Step 5, the particle swarm optimization algorithm is used to find the optimal solution to the obtained optimization data.

Description

technical field [0001] The present invention relates to a reactive power optimization strategy for an UHV AC / DC hybrid transmission system, in particular to a reactive power optimization strategy for an UHV AC / DC hybrid transmission system considering transient characteristics, belonging to the UHV AC / DC power grid operation, reactive power Optimize technical fields. Background technique [0002] New energy power such as wind power and photovoltaics is developing rapidly, and large-scale development and centralized transmission are one of the main characteristics of new energy development. With the emergence of the UHV AC-DC hybrid transmission system and its continuous operation, large-scale new energy power is effectively collected and transmitted to the load center over long distances, which not only meets the needs of large-scale new energy power transmission, but also realizes UHV transmission. DC system utilization. With the continuous increase of wind power installe...

AI Technical Summary

Problems solved by technology

With the commissioning of large-scale new energy power such as wind power and photovoltaics, the ability to withstand sudden changes in grid voltage is weakened, which is likely to cause large-scale new energy power chains to be disconnected from the grid, causing a greater impact on system stability.

A large number of wind turbines do not have low-voltage / high-voltage ride-through capability, insufficient dynamic reactive capability of wind farms, weak rapid and automatic adjustment capability of reactive power compensation equipment, and unreasonable control methods, which further contribute to the rise of transient voltage after faults

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