CN117674394B - Method for realizing operation control of small hydropower micro-grid according to reservoir capacity - Google Patents
Method for realizing operation control of small hydropower micro-grid according to reservoir capacity Download PDFInfo
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Abstract
The invention provides a method for realizing operation control of a small hydropower micro-grid according to reservoir capacity, which comprises the following steps: step 1, monitoring reservoir capacity M, small hydropower generation capacity P Hd, distributed photovoltaic generation capacity P PV, load electricity consumption capacity P L and reservoir full reservoir capacity M max data; determining the maximum exchange power P Exmax of a grid-connected line; step 2: determining constraint conditions: in the process of transmitting electric energy, setting transmission power P of a transmission line to be lower than maximum exchange power P Exmax in a grid-connected line; step 3: setting distributed photovoltaic to generate power with maximum power, comparing the generated energy P PV of the distributed photovoltaic with the power consumption P L of the local load, and then adjusting the generated energy of each distributed power supply in the system; the maximum exchange power of the transmission channel is used as constraint, and the photovoltaic power generation and the reservoir capacity of the small hydropower station are utilized to cope with the situation that when a main power supply line of the grid connection is disconnected due to faults or overhauling, the reliability of temporary power supply of a load is ensured under off-grid operation by means of the reservoir capacity of the small hydropower station.
Description
Technical Field
The invention relates to the technical field of micro-grid operation, in particular to a method for realizing operation control of a small hydropower micro-grid according to reservoir capacity.
Background
With the increase of the proportion of the distributed power generation, the micro-grid is widely focused, namely a small power generation system formed by converging a distributed power supply, energy storage equipment, an energy conversion device, related loads, a monitoring device and a protection device, and has two operation modes of grid connection and island connection, wherein the island mode refers to that the micro-grid does not run in parallel with a large power grid, and at the moment, if the power provided by the distributed power supply cannot meet the power requirement of the load, the energy storage equipment discharges to provide power for the load; if the power provided by the distributed power supply is greater than the power requirement of the load, the energy storage unit is charged, and in actual operation, when the large power grid breaks down to force the micro power grid to operate in an island mode, the micro power grid system is seriously unbalanced due to the fact that the support of the large power grid is lost, and the fluctuation and the intermittence of the output of the distributed power supply further aggravate the instability of the micro power grid operation, in order to solve the technical problem, for example, patent document with the publication date 2020.11.24 in China patent application number 202010905268.5 discloses a micro power grid operation control method which comprises the following steps: when the main network system fails, the micro-grid control system turns off the grid-connected switch, isolates the failure point and switches to island mode operation; in the island mode, the hydroelectric generating set is used as a main frequency modulation and voltage regulation power supply in the micro-grid to support the frequency and voltage of the micro-grid, and each distributed power supply rapidly participates in one-time frequency regulation to cooperatively support the stability of the frequency and voltage of the micro-grid; the micro-grid energy management system recovers the frequency and the voltage to the normal range through load grading control and energy storage accurate output adjustment.
The method solves the problem of multi-source coordination control under the island mode of the micro-grid system containing small hydropower stations, fully excavates the frequency modulation and voltage regulation capability of the traditional hydropower unit, and ensures the stability of the frequency and voltage of the micro-grid; however, in the mountain area distribution network, when the distributed photovoltaic and the small hydropower are in grid-connected operation, a main grid-connected supply line can be disconnected due to faults or overhauling, at the moment, the small hydropower unit and the distributed photovoltaic are operated in a cut-off state, and when the photovoltaic power generation capacity can not meet the load power consumption, other power generation modes are required to be considered for carrying out supplementary power generation, so that the reliability of load power supply is ensured.
Disclosure of Invention
The invention aims to provide a method for realizing operation control of a small hydropower micro-grid according to reservoir capacity, which takes the maximum exchange power of a power transmission channel as constraint, and utilizes the capacities of photovoltaic power generation and small hydropower so as to cope with the reliability of temporarily protecting power supply of a load under off-grid operation by means of the capacity of the small hydropower reservoir when a main power supply line connected with the grid is disconnected due to faults or overhauling.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for realizing operation control of a small hydropower micro-grid according to reservoir capacity comprises the following steps:
the method comprises the steps of 1, monitoring reservoir capacity M, small hydropower generation capacity P Hd, distributed photovoltaic generation capacity P PV, load electricity consumption capacity P L and reservoir full reservoir capacity M max in advance, and determining maximum exchange power P Exmax data of a grid-connected circuit;
Step 2: in the process of transmitting electric energy, setting transmission power P of a transmission line to be lower than maximum exchange power P Exmax in a grid-connected line;
Step 3: setting the distributed photovoltaic to generate power with maximum power, then comparing the distributed photovoltaic power generation amount P PV with the local load power consumption amount P L,
Step 3.1: when the distributed photovoltaic power generation amount P PV is greater than the load power consumption amount P L, comparing the difference value between the distributed photovoltaic power generation amount P PV and the load power consumption amount P L with the maximum exchange power P Exmax of the grid-connected circuit, and then regulating the power generation amount of each distributed power supply in the system through the maximum exchange power P Exmax of the grid-connected circuit and the reservoir capacity M;
Step 3.2: when the distributed photovoltaic power generation amount P PV =the load power consumption amount P L, the maximum exchange power P Exmax of the grid-connected circuit and the small hydropower power generation amount P Hd are compared, and then the power generation amount of each distributed power supply in the system is regulated by the maximum exchange power P Exmax of the grid-connected circuit and the reservoir capacity M;
Step 3.3: when the distributed photovoltaic power generation amount P PV is smaller than the power consumption amount P L, determining a difference value K between the small hydropower generation amount P Hd and the distributed photovoltaic power generation amount P PV and between the small hydropower generation amount P L and the load power consumption amount P L, comparing the difference value K with the maximum exchange power P Exmax of the grid-connected line, and then adjusting the power generation amount of each distributed power supply in the system through the maximum exchange power P Exmax of the grid-connected line, the difference value between the load power consumption amount P L and the distributed photovoltaic power generation amount P PV and the capacity of each distributed power supply in the reservoir.
By setting that the transmission power of the transmission line is lower than the maximum exchange power in the grid-connected line, the potential safety hazard of overload transmission caused by overlarge power in the electric energy transmission process is prevented; after the distributed photovoltaic is set to generate power with the maximum power, when the distributed photovoltaic power generation amount is larger than the load power consumption amount, the difference value of the distributed photovoltaic power generation amount and the load power consumption amount can be compared with the maximum exchange power of the grid-connected line, and meanwhile the reservoir capacity is considered, so that the distributed photovoltaic power generation and the power generation of a small hydropower station can be timely adjusted, and the waste of surplus electric energy is prevented; when the distributed photovoltaic power generation amount is equal to the load power consumption amount, the comparison can be carried out between the small hydropower generation amount and the maximum exchange power of the grid-connected line, and meanwhile, the reservoir capacity is considered, so that the power generation operation of the small hydropower station is controlled, and the use of the power generation electric energy of the small hydropower station is reasonably allocated; when the distributed photovoltaic power generation amount is smaller than the load power consumption amount, the difference value between the small hydropower generation amount, the distributed photovoltaic power generation amount and the load power consumption amount is required to be determined, then the difference value is compared with the maximum exchange power of a grid-connected circuit, meanwhile, the reservoir capacity is combined to control the power generation power of the small hydropower station, and further, the power supply can be reliably provided for the load, the problem of the reservoir capacity can be considered in the whole grid-connected process, so that the power generation can be performed by considering the power generation amount which can be formed by using the current reservoir capacity when the power supply amount is insufficient, the current hydropower station and the water in the reservoir can be fully utilized for power generation, and the power consumption reliability in the machine cutting process is ensured.
Further, the step 3.1 further includes the following steps:
Step 3.1.1:
If P PV-PL>PExmax is reached, reducing the distributed photovoltaic power generation to P Exmax+PL, and simultaneously setting a small hydropower station to be in a shutdown state;
Step 3.1.2:
If P PV-PL<PExmax, judging according to the reservoir capacity M,
When the reservoir capacitySetting a small hydropower station in a stop state;
When the reservoir capacity A small hydropower station is arranged to deliver electrical energy according to the power of P Exmax-(PPV-PL).
According to the arrangement, when the distributed photovoltaic power generation capacity can meet the requirement, the photovoltaic power station generates power by the sum of the maximum exchange power of the grid-connected circuit and the load power consumption, the load power consumption is ensured, if the distributed photovoltaic power generation capacity can not meet the requirement, the power generation is not performed when the reservoir capacity is considered to be too low, and if the reservoir capacity meets the requirement, the water in the reservoir is utilized for power generation, so that the photovoltaic power generation and the power generation of a small hydropower station are reasonably regulated, and the unreasonable distribution of the surplus power is prevented.
Further, the step 3.2 further includes the following steps:
Step 3.2.1:
If P Hd>PExmax is reached, the small hydropower station is set to generate power according to the maximum exchange power P Exmax of the grid-connected line;
step 3.2.2:
if P Hd<PExmax, judging according to the reservoir capacity M,
When the reservoir capacitySetting a small hydropower station in a stop state;
When the reservoir capacity And setting a small hydropower station to generate electricity with the maximum generated power.
According to the arrangement, the small hydropower generation capacity is compared with the maximum exchange power of the grid-connected circuit, when the small hydropower generation capacity is smaller than the maximum exchange power, whether the reservoir is used for carrying out supplementary power generation is determined according to the reservoir capacity, and the power consumption of the load is compared with the maximum exchange power of the grid-connected circuit, so that the power generation power of the small hydropower station can be reasonably controlled, and the stability of load power supply is ensured.
Further, the step 3.3 further includes:
difference k=p Hd-( PL- PPV).
The arrangement is convenient for calculating the difference value between the small hydropower generation amount P Hd, the distributed photovoltaic generation amount P PV and the load power consumption amount P L.
Further, the step 3.3 further includes the following steps:
Step 3.3.1:
If K > P Exmax, setting a small hydropower station to generate power according to the maximum exchange power P Exmax of the grid-connected line;
step 3.3.2:
If K is less than P Exmax, judging according to reservoir capacity M,
When the reservoir capacitySetting a small hydropower station to generate electricity with maximum power;
When the reservoir capacity Setting a small hydropower station to generate electricity according to the power of (P L- PPV);
when the reservoir capacity M is reduced to And (3) setting the small hydropower station in a stop state, transmitting power by a grid-connected line, and returning to the step (3).
By comparing the difference value with the maximum exchange power of the grid-connected line and combining the storage capacity of the current reservoir capacity, the power generation power of the small hydropower station can be reasonably controlled, the power generation capacity of the small hydropower station is further controlled, and the power consumption of the load can be stably ensured when the grid-connected main power supply line is disconnected.
Drawings
Fig. 1 is a general block diagram of the present invention.
Fig. 2 is a general workflow diagram of the present invention.
Fig. 3 is a flowchart of step 3 in the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1-3, a method for implementing operation control of a small hydropower micro-grid according to reservoir capacity comprises a small hydropower station, distributed photovoltaic, load and grid-connected lines,
The control method further comprises the following specific steps:
Step 1: the method comprises the steps of monitoring reservoir capacity M, small hydropower generation capacity P Hd, distributed photovoltaic generation capacity P PV, load power consumption P L and reservoir full-reservoir capacity M max in advance, and determining maximum exchange power P Exmax data of a grid-connected circuit.
Step 2: determining constraint conditions:
In the process of transmitting electric energy, the transmission power P of the transmission line is set to be lower than the maximum exchange power P Exmax in the grid-connected line.
Step 3: setting the distributed photovoltaic to generate power with maximum power, then comparing the distributed photovoltaic power generation amount P PV with the local load power consumption amount P L,
Step 3.1: when the distributed photovoltaic power generation amount P PV is larger than the load power consumption amount P L, the difference value between the distributed photovoltaic power generation amount P PV and the load power consumption amount P L is compared with the maximum exchange power P Exmax of the grid-connected line, and then the power generation amount of each distributed power supply in the system is regulated through the maximum exchange power P Exmax of the grid-connected line and the reservoir capacity M.
In step 3.1: the method specifically comprises the following steps of 3.1.1 and 3.1.2, wherein the power generation amount of each distributed power supply in the reservoir capacity M regulating system is compared with the maximum exchange power P Exmax of the grid-connected circuit through the difference value between the distributed photovoltaic power generation amount P PV and the load power consumption amount P L, and then the maximum exchange power P Exmax of the grid-connected circuit is used for regulating the power generation amount of each distributed power supply in the system:
Step 3.1.1:
If P PV-PL>PExmax is reached, reducing the distributed photovoltaic power generation to P Exmax+PL, and simultaneously setting a small hydropower station to be in a shutdown state;
Step 3.1.2:
If P PV-PL<PExmax, judging according to the reservoir capacity M,
When the reservoir capacitySetting a small hydropower station in a stop state;
When the reservoir capacity Setting a small hydropower station to transmit electric energy according to the power of P Exmax-(PPV-PL);
Step 3.2: when the distributed photovoltaic power generation amount P PV =the load power consumption amount P L, the power generation amount of each distributed power supply in the system is regulated by comparing the maximum exchange power P Exmax of the grid-connected line with the small hydropower power generation amount P Hd, and then by comparing the maximum exchange power P Exmax of the grid-connected line with the small hydropower power generation amount P Hd of the reservoir capacity M, in step 3.2, "the power generation amount of each distributed power supply in the system is regulated by comparing the maximum exchange power P Exmax of the grid-connected line with the small hydropower power generation amount P Hd, and then by comparing the maximum exchange power P Exmax of the grid-connected line with the reservoir capacity M", specifically comprises the following steps 3.2.1 and 3.2.2.
Step 3.2.1:
If P Hd>PExmax is reached, the small hydropower station is set to generate power according to the maximum exchange power P Exmax of the grid-connected line;
step 3.2.2:
if P Hd<PExmax, judging according to the reservoir capacity M,
When the reservoir capacitySetting a small hydropower station in a stop state;
When the reservoir capacity Setting a small hydropower station to generate electricity with maximum power;
Step 3.3: when the distributed photovoltaic power generation amount P PV < the power consumption amount P L, a difference K between the small hydropower generation amount P Hd and the distributed photovoltaic power generation amount P PV and the load power consumption amount P L is determined, in this embodiment, the difference k=p Hd-( PL- PPV), the difference K is compared with the grid-connected line maximum exchange power P Exmax, and then the difference between the grid-connected line maximum exchange power P Exmax, the load power consumption amount P L and the distributed photovoltaic power generation amount P PV, and the power generation amount of each distributed power supply in the reservoir capacity regulating system are used.
In step 3.3 ", the difference K is compared with the maximum exchange power P Exmax of the grid-connected line, and then the step 3.3.1 and the step 3.3.2 are specifically included by the maximum exchange power P Exmax of the grid-connected line, the difference between the load electricity consumption amount P L and the distributed photovoltaic power generation amount P PV, and the power generation amount of each distributed power supply in the reservoir capacity adjusting system.
Step 3.3.1:
If K > P Exmax, setting a small hydropower station to generate power according to the maximum exchange power P Exmax of the grid-connected line;
step 3.3.2:
If K is less than P Exmax, judging according to reservoir capacity M,
When the reservoir capacitySetting a small hydropower station to generate electricity with maximum power;
When the reservoir capacity Setting a small hydropower station to generate electricity according to the power of (P L- PPV);
when the reservoir capacity M is reduced to And (3) setting the small hydropower station in a stop state, transmitting power by a grid-connected line, and returning to the step (3).
The working principle of the invention is as follows: by setting the transmission power of the transmission line to be lower than the maximum exchange power in the grid-connected line, potential safety hazards caused by overload transmission due to overlarge power in the electric energy transmission process are prevented; after the distributed photovoltaic is set to generate power with the maximum power, when the distributed photovoltaic power generation amount is larger than the load power consumption amount, the difference value of the distributed photovoltaic power generation amount and the load power consumption amount can be compared with the maximum exchange power of the grid-connected line, and meanwhile the reservoir capacity is considered, so that the distributed photovoltaic power generation and the power generation of a small hydropower station can be timely adjusted, and the waste of surplus electric energy is prevented; when the distributed photovoltaic power generation amount is equal to the load power consumption amount, the comparison can be carried out between the small hydropower generation amount and the maximum exchange power of the grid-connected line, and meanwhile, the reservoir capacity is considered, so that the power generation operation of the small hydropower station is controlled, and the use of the power generation electric energy of the small hydropower station is reasonably allocated; when the distributed photovoltaic power generation amount is smaller than the load power consumption amount, the difference value between the small hydropower generation amount, the distributed photovoltaic power generation amount and the load power consumption amount is required to be determined, then the difference value is compared with the maximum exchange power of a grid-connected circuit, meanwhile, the reservoir capacity is combined to control the power generation power of the small hydropower station, and further, the power supply can be reliably provided for the load, the problem of the reservoir capacity can be considered in the whole grid-connected process, so that the power generation can be performed by considering the power generation amount which can be formed by using the current reservoir capacity when the power supply amount is insufficient, the current hydropower station and the water in the reservoir can be fully utilized for power generation, and the power consumption reliability in the machine cutting process is ensured.
Claims (5)
1. A method for realizing operation control of a small hydropower micro-grid according to reservoir capacity is characterized by comprising the following steps: the method comprises the following steps:
Step 1, monitoring reservoir capacity M, small hydropower generation capacity P Hd, distributed photovoltaic generation capacity P PV, load electricity consumption capacity P L and reservoir full reservoir capacity M max data; determining the maximum exchange power P Exmax of a grid-connected line;
Step 2: determining constraint conditions:
in the process of transmitting electric energy, setting transmission power P of a transmission line to be lower than maximum exchange power P Exmax in a grid-connected line;
Step 3: setting the distributed photovoltaic to generate power with maximum power, then comparing the distributed photovoltaic power generation amount P PV with the local load power consumption amount P L,
Step 3.1: when the distributed photovoltaic power generation amount P PV is greater than the load power consumption amount P L, comparing the difference value between the distributed photovoltaic power generation amount P PV and the load power consumption amount P L with the maximum exchange power P Exmax of the grid-connected circuit, and then regulating the power generation amount of each distributed power supply in the system through the maximum exchange power P Exmax of the grid-connected circuit and the reservoir capacity M;
Step 3.2: when the distributed photovoltaic power generation amount P PV =the load power consumption amount P L, the maximum exchange power P Exmax of the grid-connected circuit and the small hydropower power generation amount P Hd are compared, and then the power generation amount of each distributed power supply in the system is regulated by the maximum exchange power P Exmax of the grid-connected circuit and the reservoir capacity M;
Step 3.3: when the distributed photovoltaic power generation amount P PV is smaller than the power consumption amount P L, determining a difference K between the small hydropower generation amount P Hd and the distributed photovoltaic power generation amount P PV and a difference K between the small hydropower generation amount P L and the load power consumption amount P L, comparing the difference K with the maximum exchange power P Exmax of the grid-connected line, and then adjusting the power generation amount of each distributed power supply in the system through the maximum exchange power P Exmax of the grid-connected line, the difference between the load power consumption amount P L and the distributed photovoltaic power generation amount P PV and the difference between the reservoir capacity and the difference K.
2. The method for realizing operation control of the small hydropower micro-grid according to the reservoir capacity according to claim 1, wherein the method comprises the following steps: the step 3.1 further comprises the following steps:
Step 3.1.1:
If P PV-PL>PExmax is reached, reducing the distributed photovoltaic power generation to P Exmax+PL, and simultaneously setting a small hydropower station to be in a shutdown state;
Step 3.1.2:
If P PV-PL<PExmax, judging according to the reservoir capacity M,
When the reservoir capacitySetting a small hydropower station in a stop state;
When the reservoir capacity A small hydropower station is arranged to deliver electrical energy according to the power of P Exmax-(PPV-PL).
3. The method for realizing operation control of the small hydropower micro-grid according to the reservoir capacity according to claim 1, wherein the method comprises the following steps: the step 3.2 further comprises the following steps:
Step 3.2.1:
If P Hd>PExmax is reached, the small hydropower station is set to generate power according to the maximum exchange power P Exmax of the grid-connected line;
step 3.2.2:
if P Hd<PExmax, judging according to the reservoir capacity M,
When the reservoir capacitySetting a small hydropower station in a stop state;
When the reservoir capacity And setting a small hydropower station to generate electricity with the maximum generated power.
4. The method for realizing operation control of the small hydropower micro-grid according to the reservoir capacity according to claim 1, wherein the method comprises the following steps: the step 3.3 further includes:
difference k=p Hd-( PL- PPV).
5. The method for realizing operation control of the small hydropower micro-grid according to the reservoir capacity according to claim 1, wherein the method comprises the following steps: the step 3.3 further comprises the following steps:
Step 3.3.1:
If K > P Exmax, setting a small hydropower station to generate power according to the maximum exchange power P Exmax of the grid-connected line;
step 3.3.2:
If K is less than P Exmax, judging according to reservoir capacity M,
When the reservoir capacitySetting a small hydropower station to generate electricity with maximum power;
When the reservoir capacity Setting a small hydropower station to generate electricity according to the power of (P L- PPV);
when the reservoir capacity M is reduced to And (3) setting the small hydropower station in a stop state, transmitting power by a grid-connected line, and returning to the step (3).
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