A fast power optimization method for distributed photovoltaic power sources in distribution network

Abstract

The invention discloses a method for rapidly optimizing the power of distributed photovoltaic power sources in a distribution network, comprising the following steps: inputting initial parameters for optimization calculation; measuring variables related to the distribution network and photovoltaic inverters; transmitting the measurement information through communication The network is centralized and uploaded to the centralized controller; using the measurement information, based on the optimization problem model, the centralized controller solves the photovoltaic inverter power optimization problem; the photovoltaic inverter active power and reactive power decision results are transmitted to each inverter. Inverter, each inverter operates in the optimal state according to this control signal. The method of the invention performs optimal control on the power of the distributed photovoltaic inverters in the distribution network, and can ensure high optimization accuracy under the premise of high calculation and control speed, and can alleviate the problems caused by the introduction of distributed power sources. The resulting distribution network overvoltage problem can ensure that the distribution network operates in the most economical state.

Description

technical field [0001] The invention relates to the technical field of dispatching operation and control of power systems, in particular to a rapid optimization method for active power and reactive power of distributed photovoltaic power sources in a distribution network. Background technique [0002] The grid-connected capacity of renewable energy represented by photovoltaic power is getting higher and higher, and the distributed photovoltaic inverter unit in the distribution network is a common form of photovoltaic power utilization. The introduction of distributed generation has changed the unidirectional power flow characteristics of the traditional distribution network, causing a reverse flow phenomenon in the distribution network, which will lead to an increase in the node voltage of the distribution network and the deterioration of the power supply quality of the distribution network, which has become a limitation. An important factor for the further improvement of th...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent No. 201510612247.3: "A Reactive Power Control Method Applied to Photovoltaic Grid-connected Converters" discloses a reactive power control method applied to photovoltaic grid-connected converters. Measure the voltage of the inverter at the connection point of the grid, obtain the instantaneous reactive current of the inverter and control the power factor of the inverter, so as to achieve the purpose of adjusting the voltage at the outlet of the inverter, but this patent can only realize For the voltage control of the inverter outlet node, from the perspective of the whole network voltage control, the reactive power of a single inverter is not necessarily optimal, and the decision-making method of active power is not involved; the patent number is 201721134422.3 in China Patent: "A Photovoltaic Power Station Active Power, Reactive Power and Voltage Control Device", which discloses a photovoltaic power station active power, reactive power and voltage control device. In this patent, the active power and reactive power of photovoltaic power generation units The value setting is separated, without considering the unified optimization of active and reactive power, which has certain limitations

Images