Source-load-supply matching method for rural energy system

Abstract

The application provides a source-load supply-demand matching method of a rural energy system, and is applied to the technical field of rural energy system operation evaluation. The method comprises the following steps: collecting source-side output power, load power consumption, adjustment power and power generation power of a target power source for a target feeder; determining a source-load supply-consumption energy proportionality coefficient according to the source-side output power, the load power consumption and the adjustment power; obtaining an on-site energy proportion according to the power generation power of the target power source and the load power consumption; determining a scheduling demand index for cross-line scheduling of the target feeder according to the source-load supply-consumption energy proportionality coefficient and the on-site energy proportion; obtaining source-load supply-demand matching degree information according to the source-load supply-consumption energy proportionality coefficient, the on-site energy proportion and the scheduling demand index; and controlling a power adjustment device to utilize the electric energy of other feeders except the target feeder in a plurality of feeders to perform electric energy scheduling on the target feeder, so that the target feeder realizes source-load supply-demand matching.

Claims

1. A method for matching the supply and demand of energy sources in a rural energy system, characterized in that, The rural energy system includes a distributed power source, multiple feeders connected between the distributed power source and multiple loads, and a power regulation device electrically connected to the multiple feeders. The source-load supply-demand matching method includes: During the operation of the rural energy system, for the target feeder among the multiple feeders, the source-side output power, load power consumption, the adjustment power of the power regulation device on the target feeder, and the power generation power of the target power source connected to the target feeder are collected at each moment. Based on the source-side power output, load power consumption, and regulation power of the target feeder at multiple times, the source-load power consumption ratio coefficient is determined. The source-load power consumption ratio coefficient characterizes the degree of deviation between the source-side power output and the load power demand in the time dimension under the action of regulation power. Based on the power generation of the target power source connected to the target feeder and the power consumption of the load at multiple times, the local energy ratio of the target feeder is obtained. The local energy ratio represents the proportion of the power consumption of the target load connected to the target feeder to the target power source to the total power consumption of the multiple loads to the distributed power source. Based on the source-load energy consumption ratio coefficient and the local energy proportion, a scheduling demand index for cross-line scheduling of the target feeder is determined. Based on the source-load energy consumption ratio coefficient, the local energy proportion, and the dispatch demand index, the source-load supply and demand matching information of the target feeder is obtained; Based on the source-load supply-demand matching information, the power regulation device is controlled to utilize the power of other feeders among the multiple feeders, excluding the target feeder, to perform power dispatching on the target feeder, so that the target feeder achieves source-load supply-demand matching.

2. The source-load supply-demand matching method according to claim 1, characterized in that, The step of determining the source-load energy consumption ratio coefficient based on the source-side power output, load power consumption, and regulation power of the target feeder at multiple times includes: The net power difference at each time moment is determined based on the source-side output power, the regulating power, and the load power consumption at each time moment; The cumulative power deficit is determined based on the net power difference at multiple times. The cumulative power deficit is compared with the power reference value to obtain the source-load energy consumption ratio coefficient. The power reference value is the maximum value among the power deviation amplitudes of the multiple feeders. The power deviation amplitude of each feeder is the maximum value among the candidate power deviations of the feeder at multiple times. The candidate power deviation at each time is the absolute value of the difference between the source-side output power and the load power consumption at each time.

3. The source-load supply-demand matching method according to claim 1, characterized in that, The step of obtaining the local energy proportion of the target feeder based on the power generation of the target power source connected to the target feeder and the load power consumption at multiple times includes: The transmission loss power is determined based on the load power consumption, the preset feeder loss rate, and the auxiliary power required for the operation of the rural energy system. The net power generation is determined based on the difference between the power generation of the target power source connected to the target feeder and the transmission loss power. Based on the load power consumption and the auxiliary power, the total load demand of the target load is determined; The smaller value between the net power generation and the total load demand is determined as the actual local power consumption. The ratio of the actual local power consumption to the total power demand of the load is taken as the local energy ratio.

4. The source-load supply-demand matching method according to claim 1, characterized in that, The step of determining the dispatch demand index for cross-line dispatching of the target feeder based on the source-load energy consumption ratio coefficient and the local energy proportion includes: The energy supply and consumption ratio coefficient of the source load is positively processed to obtain the positively processed energy supply and consumption ratio coefficient of the source load. The dispatch demand index is obtained based on the reciprocal of the local energy proportion and the positive source-load energy consumption ratio coefficient.

5. The source-load supply-demand matching method according to claim 4, characterized in that, The step of obtaining the source-load supply-demand matching information of the target feeder based on the source-load energy consumption ratio coefficient, the local energy proportion, and the dispatch demand index includes: The source-load energy consumption ratio coefficient, the local energy proportion, and the dispatch demand index are weighted and fused to obtain the source-load supply-demand matching information of the target feeder.

6. The source-load supply-demand matching method according to claim 1, characterized in that, The source-load supply-demand matching method also includes: For any pair of adjacent time points among the plurality of time points, the direction of change of the source-side power output and the direction of change of the load power consumption are compared respectively. The number of adjacent time points with the same direction of change is determined as the number of consistent pairs, and the number of adjacent time points with opposite directions of change is determined as the number of inconsistent pairs. Based on the difference between the number of consistent pairs and the number of inconsistent pairs, the source-load temporal correlation is obtained by comparing it with the total number of adjacent time pairs among the multiple time points.

7. The source-load supply-demand matching method according to claim 6, characterized in that, The source-load supply-demand matching method also includes: Based on the source-side power output and load power consumption of the target feeder at multiple times, determine a first time corresponding to the peak value of the source-side power output and a second time corresponding to the peak value of the load power consumption; Based on the time difference between the first moment and the second moment, the peak misalignment degree is determined. The peak misalignment degree characterizes the degree of misalignment between the peak value of the source-side power output and the peak value of the load power consumption in the time dimension.

8. The source-load supply-demand matching method according to claim 7, characterized in that, The source-load supply-demand matching method also includes: Based on the load power consumption, auxiliary power, and transmission loss power, determine the total power consumption of the target feeder; The smaller value between the power generation of the target power source connected to the target feeder and the total power consumption is determined as the actual power generation absorbed. The local energy matching degree is determined based on the ratio of the actual power generation absorbed to the power generation of the target power source.

9. The source-load supply-demand matching method according to claim 8, characterized in that, The source-load supply-demand matching method also includes: The energy supply and consumption ratio coefficient of the source load is positively processed to obtain the positively processed energy supply and consumption ratio coefficient of the source load. The peak misalignment is positiveized to obtain the positive peak misalignment. The source-load time-series correlation, the positive source-load energy consumption ratio coefficient, the positive peak misalignment, the local energy proportion, the local energy matching degree, and the dispatch demand index are weighted and fused to obtain the source-load supply-demand matching degree information of the target feeder.

10. The source-load supply-demand matching method according to any one of claims 1 or 9, characterized in that, The step of controlling the power regulation device to perform power dispatching on the target feeder based on the source-load supply-demand matching information includes: Based on the source load supply and demand matching information of each of the multiple feeders, a feeder with excess output is identified from the multiple feeders; Based on the source-load supply-demand matching information of the overcapacity feeder, the power dispatch quantity of the power regulation device is determined. The power regulation device is controlled to perform power dispatch between the overcapacity feeder and the target feeder based on the power dispatch amount, so that the multiple feeders can achieve source-load supply-demand matching.

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