Urban distribution network voltage regional active control method with high proportion of controllable source and load

Abstract

The invention belongs to the field of power system protection and control and relates to an urban distribution network voltage regional active control method with a high proportion of controllable source and load. The method comprises dividing a distribution network into a plurality of autonomous regions; according to the amount of change in the regional active power caused by the power active output and load fluctuation, evaluating the capability of the controllable active capacity and the controllable reactive capacity of the autonomous regions to suppress the influence of the active power change on the node voltage; according to an evaluation result, calculating the active and reactive power control reference values of a gas turbine, a wind power source, a photovoltaic power source, storage energy and an electric vehicle charging pile by using a regional active power optimization model, a regional reactive power optimization model, and a regional active and reactive power coordinated optimization model; and when the node voltage in the regions exceeds an allowable range, switching the control reference values to the calculated power reference values so as to implement active active power control, active reactive power control or power active coordinated control separately.

Description

technical field [0001] The invention belongs to the field of power system protection and control, relates to the field of distribution network operation control, and specifically refers to an active control method for urban distribution network voltage divisions with high proportion controllable source loads. Background technique [0002] The active distribution network including controllable distributed power sources such as gas turbines, wind power sources, photovoltaic power sources, and energy storage, as well as controllable loads such as electric vehicles, is the main trend of the current distribution network development. The access of distributed power can realize the local energy balance of the distribution network and avoid the investment and loss of long-distance power transmission; but at the same time, the access of distributed power also changes the one-way radial power supply of the traditional distribution network. Due to the strong randomness and volatility o...

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to determine the optimal control reference value of the reactive power output of a distributed power supply through matrix calculation and optimal power flow according to the node voltage level, so as to improve the voltage of the distribution network by using the reactive power control of the distributed power supply. quality, but the control ability of this type of method is usually insufficient, and the coordination between distributed power sources is lacking, and the effect on the voltage control of the distribution network is limited

Under the condition of satisfying the voltage constraints, taking the minimum of network loss or the minimum of regulation cost as the objective function, the cooperative control of reactive power output of distributed generation is another common method of voltage control in distribution network with controllable source load. method, but the reactive power optimization of the whole network not only has economic and power quality problems, but also may cause the control effect to be difficult to meet the requirements, and the controllable source-load active power control has not been used to regulate the node voltage. Reactive power control capability is also often overlooked

At present, the voltage problem of the distribution network with a high proportion of controllable source loads cannot be solved, resulting in the quality of power supply of the distribution network failing to meet the requirements, and the risk of safe operation continues to increase

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