CN116862559A - A method, system and equipment for participating in flexible market transactions when water and electricity are not quoted - Google Patents

Abstract

The invention discloses a method, a system and equipment for participating in flexible market transaction when hydropower is not offered, which relate to the technical field of electric power, and the method comprises the following steps: receiving grid basic data, wherein the grid basic data comprises: unit data, load data, new energy data and payload prediction error data; calculating and obtaining the system flexibility requirement according to the net load prediction error data; inputting the system flexibility requirement into a pre-established main energy and flexibility climbing market joint clearing model without considering the participation of water and electricity to obtain the system flexibility climbing shortage; under the consideration of the participation of water and electricity, the system flexible climbing shortage is input into a pre-established main energy and flexible climbing market joint clearing model, and the water and electricity benefits are obtained.

Description

A method, system and equipment for participating in flexible market transactions when water and electricity are not quoted

Technical field

The invention relates to the field of electric power technology, specifically a method, system and equipment for participating in flexible market transactions when water and electricity are not quoted.

Background technique

The proportion of new energy connected to the grid continues to increase, which puts forward higher requirements for the flexible adjustment capability of the power system. Among the existing flexible resources, hydropower resources have the advantages of excellent regulation performance and low regulation cost, and are the best choice to undertake flexible regulation tasks. In current flexibility ramping product transactions, flexibility ramping capabilities are priced based on opportunity costs. There is a lack of research on the flexibility ramping market trading mechanism when hydropower does not participate in power spot market quotations and it is difficult to calculate opportunity costs. Therefore, it is necessary to establish a joint clearing model of the main energy and flexibility ramping markets when hydropower does not quote, and formulate a reasonable hydropower revenue mechanism to encourage hydropower to participate in flexibility resource dispatching and ensure flexibility adequacy in the system.

Contents of the invention

In order to solve the deficiencies mentioned in the above background technology, the purpose of the present invention is to provide a method, system and equipment for participating in flexibility market transactions when water and electricity are not quoted.

The object of the present invention can be achieved through the following technical solution: a method for participating in flexibility market transactions when water and electricity are not quoted, the method includes the following steps:

Receive basic data of the power grid, where the basic data of the power grid includes: unit data, load data, new energy data and net load prediction error data;

System flexibility requirements are calculated based on net load forecast error data;

Without considering the participation of hydropower, the system flexibility demand is input into the pre-established main energy and flexibility ramping market joint clearing model to obtain the system flexibility ramping deficit;

Taking into account the participation of hydropower, the system flexibility ramping deficit is input into the pre-established main energy and flexibility ramping market joint clearing model to obtain hydropower income.

Preferably, the net load is the remaining load after subtracting the new energy power generation from the total load, and the net load prediction error consists of a load prediction error and a new energy prediction error.

Preferably, the system flexibility requirements include forecasting net load fluctuations and uncertainty requirements.

Preferably, the predicted net load fluctuation is the change in the net load of the system in the next period compared with the current period, and the uncertainty demand is: the additional demand generated in order to meet the deviation of the system net load prediction within a certain confidence interval .

Preferably, the main energy and flexibility ramp-up market joint clearing model is as follows:

minf＝C _G +C _F +C _I

In the formula: C _G is the total cost of thermal power units; C _F is the cost of insufficient system flexibility; C _I is the operating penalty term of hydro power units, and:

In the formula: a _i and b _i are the quotation curve coefficients of thermal power unit i respectively; are respectively the climbing and landslide deficits of thermal power unit i at time t, that is, the system flexibility deficit;/> is the start-up and stop state variable of the hydropower unit k at time t, 1 means start-up, 0 means stop; π ^cap is the upper limit of the system price; μ is the operation penalty coefficient of the hydropower unit, which is set to 10 ⁷ to ensure that the running time of the hydropower unit is short; N _T is the number of simulation time segments; N _G is the number of generators.

Preferably, the main energy and flexibility ramp-up market joint clearing model considers the first two terms of the objective function _CG and _CF when the participation of hydropower is not considered; when the participation of hydropower is considered, the first and third terms of the objective function are considered Items C _G and C _I .

Preferably, the constraints of the main energy and flexibility ramp-up market joint clearing model are as follows:

a. Electricity balance constraints:

In the formula: is the output level of thermal power unit i at time t,/> is the output level of hydropower unit k at time t, is the predicted net load at time t;

b. Thermal power unit output constraints:

In the formula: P _G,i,max and P _G,i,min respectively represent the upper and lower limits of the output of thermal power unit i;

c. Thermal power unit climbing constraints:

In the formula: R _UG,i and R _DG,i respectively represent the upward climbing rate and downward slope rate of thermal power unit i;

d. Hydropower unit output constraints:

In the formula: P _H,k,max and P _H,k,min are the upper and lower output limits of hydropower unit k respectively;

e. Hydropower unit climbing constraints:

In the formula: R _UH,k and R _DH,k respectively represent the upward climbing rate and downward slope rate of hydropower unit k;

f. Flexibility balance constraints:

In the formula: are respectively the upward and downward flexibility reserved for thermal power unit i at time t;/> are respectively the upward and downward flexibility reserved for hydropower unit k at time t; FUS ^t and FDS ^t are respectively the upward and downward flexibility requirements of the system at time t:

In the formula: FUU ^t+1 and FDS ^t+1 are the upward and downward uncertainties of the system at time t+1 respectively;

g. Flexibility output constraints of thermal power units:

h. Flexibility output constraints of hydropower units:

Preferably, the hydropower revenue includes main energy market revenue and flexibility ramping market revenue, where the main energy market revenue is the difference between the total cost of thermal power without considering and considering the participation of hydropower; the flexibility ramping market revenue It is the product of the system flexibility ramping gap and the system price ceiling.

Preferably, a system for participating in flexibility market transactions when water and electricity are not quoted includes:

Data acquisition module: used to receive basic data of the power grid. The basic data of the power grid includes: unit data, load data, new energy data and net load prediction error data;

Calculation module: used to calculate system flexibility requirements based on net load forecast error data;

Calculation module of the model without considering the participation of hydropower: used to input the system flexibility demand into the pre-established main energy and flexibility ramping market joint clearing model without considering the participation of hydropower, and obtain the system flexibility ramping deficit;

Model calculation module considering hydropower participation: used to enter the system flexibility ramping deficit into the pre-established main energy and flexibility ramping market joint clearing model to obtain hydropower income, taking hydropower participation into consideration.

Preferably, a device includes:

one or more processors;

Memory, used to store one or more programs;

When one or more of said programs are executed by one or more of said processors, one or more of said processors participate in a flexibility market trading method when implementing a utility non-quotation as described above.

Beneficial effects of the present invention:

This invention aims at the flexibility ramping demand caused by uncertainty under high-proportion new energy access. At the same time, considering the special situation that hydropower does not participate in the quotation, the invention provides a joint clearing model of the main energy and flexibility ramping markets, which is divided into A two-step solution without considering hydropower and considering hydropower is used to reasonably evaluate the contribution of hydropower in providing flexible ramping capabilities, and a hydropower income settlement method is given. The invention provides a certain reference for hydropower resources to participate in flexibility ramping product transactions, is conducive to increasing the enthusiasm of hydropower to participate in the flexibility ramping market, and improves the safety and economy of system operation.

Description of the drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings needed to describe the embodiments or the prior art. Obviously, for those of ordinary skill in the art, Speaking of which, other drawings can be obtained based on these drawings without any creative effort;

Figure 1 is a schematic flow chart of the method of the present invention;

Figure 2 shows the output results of thermal power units without considering the participation of hydropower;

Figure 3 shows the output results of thermal power and hydropower considering the participation of hydropower.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

As shown in Figure 1, a method for participating in flexibility market transactions when hydropower is not quoted includes the following steps:

Receive basic data of the power grid, where the basic data of the power grid includes: unit data, load data, new energy data and net load prediction error data;

The net load is the remaining load after subtracting the new energy generation from the total load, and the net load prediction error is composed of the load prediction error and the new energy prediction error.

System flexibility requirements are calculated based on net load forecast error data;

The system flexibility requirements include forecasting net load fluctuations and uncertainty requirements.

The predicted net load fluctuation is the change in the net load of the system in the next period compared with the current period, and the uncertainty demand is the additional demand generated in order to meet the deviation of the system net load prediction within a certain confidence interval.

Without considering the participation of hydropower, the system flexibility demand is input into the pre-established main energy and flexibility ramping market joint clearing model to obtain the system flexibility ramping deficit;

Taking into account the participation of hydropower, the system flexibility ramping deficit is input into the pre-established main energy and flexibility ramping market joint clearing model to obtain hydropower income. Hydropower revenue includes main energy market revenue and flexibility ramping market revenue. Among them, the main energy market revenue is the difference between the total cost of thermal power without considering and considering the participation of hydropower (it is believed that the participation of hydropower reduces the clearance of thermal power and reduces the total cost of thermal power, so this part of the cost difference is regarded as hydropower income in the main energy market); the revenue from the flexibility ramping market is the product of the system flexibility ramping deficit and the system price ceiling (it is believed that the participation of hydropower enables the system to avoid economic losses caused by insufficient flexibility, so this part of the system is Insufficient flexibility costs are compensated for water and electricity).

The primary energy and flexibility ramp market joint clearing model is as follows:

minf＝C _G +C _F +C _I

In the formula: C _G is the total cost of thermal power units; C _F is the cost of insufficient system flexibility; C _I is the operating penalty term of hydro power units, and:

In the formula: a _i and b _i are the quotation curve coefficients of thermal power unit i respectively; are respectively the climbing and landslide deficits of thermal power unit i at time t, that is, the system flexibility deficit;/> is the start-up and stop state variable of the hydropower unit k at time t, 1 means start-up, 0 means stop; π ^cap is the upper limit of the system price; μ is the operation penalty coefficient of the hydropower unit, which is set to 10 ⁷ to ensure that the running time of the hydropower unit is short; N _T is the number of simulation time segments; N _G is the number of generators.

When the main energy and flexibility ramp-up market joint clearing model does not consider the participation of hydropower, the first two terms C _G and C _F of the objective function are considered; when the participation of hydropower is considered, the first term and the third term C _G of the objective function are considered and _CI .

The constraints of the main energy and flexibility ramp-up market joint clearing model are as follows:

a. Electricity balance constraints:

In the formula: is the output level of thermal power unit i at time t,/> is the output level of hydropower unit k at time t, is the predicted net load at time t;

b. Thermal power unit output constraints:

In the formula: P _G,i,max and P _G,i,min respectively represent the upper and lower limits of the output of thermal power unit i;

c. Thermal power unit climbing constraints:

In the formula: R _UG,i and R _DG,i respectively represent the upward climbing rate and downward slope rate of thermal power unit i;

d. Hydropower unit output constraints:

In the formula: P _H,k,max and P _H,k,min are the upper and lower output limits of hydropower unit k respectively;

e. Hydropower unit climbing constraints:

In the formula: R _UH,k and R _DH,k respectively represent the upward climbing rate and downward slope rate of hydropower unit k;

f. Flexibility balance constraints:

In the formula: are respectively the upward and downward flexibility reserved for thermal power unit i at time t;/> are respectively the upward and downward flexibility reserved for hydropower unit k at time t; FUS ^t and FDS ^t are respectively the upward and downward flexibility requirements of the system at time t:

In the formula: FUU ^t+1 and FDS ^t+1 are the upward and downward uncertainties of the system at time t+1 respectively;

g. Flexibility output constraints of thermal power units:

h. Flexibility output constraints of hydropower units:

A system for participating in flexible market transactions when water and electricity are not quoted, including:

Data acquisition module: used to receive basic data of the power grid. The basic data of the power grid includes: unit data, load data, new energy data and net load prediction error data;

Calculation module: used to calculate system flexibility requirements based on net load forecast error data;

Calculation module of the model without considering the participation of hydropower: used to input the system flexibility demand into the pre-established main energy and flexibility ramping market joint clearing model without considering the participation of hydropower, and obtain the system flexibility ramping deficit;

Model calculation module considering hydropower participation: used to enter the system flexibility ramping deficit into the pre-established main energy and flexibility ramping market joint clearing model to obtain hydropower income, taking hydropower participation into consideration.

Based on the same inventive concept, the present invention also provides a computer device. The computer device includes: one or more processors and a memory for storing one or more computer programs; the program includes program instructions, and the processor is used for executing Memory stores program instructions. The processor may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or field programmable gate array (Field-Programmable GateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal. They are used to implement one or more instructions, specifically for Load and execute one or more instructions in the computer storage medium to implement the above method.

It should be further explained that, based on the same inventive concept, the present invention also provides a computer storage medium, the storage medium stores a computer program, and the computer program executes the above method when run by a processor. The storage medium may be any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electrical, magnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections having one or more conductors, portable computer disks, hard drives, random access memory (RAM), read only memory (ROM), Erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium that contains or stores a program for use by or in conjunction with an instruction execution system, apparatus, or device.

Specific examples are used below to verify.

The system includes 3 thermal power units and 1 hydropower unit, with a one-hour dispatch cycle. The unit data is shown in Table 1 (since the hydropower unit does not participate in the quotation, its quotation is considered to be 0); the net load data is shown in Table 2.

Table 1 Unit data

Table 2 Net load data

The main energy and flexibility ramp market joint clearing model established in this invention is solved without considering the participation of hydropower. The thermal power output results are shown in Figure 2. The landslide amount provided by thermal power in the last 5 minutes is shown in Table 3. The total cost of the thermal power unit is shown in Table 4. The costs of insufficient system flexibility are shown in Table 5.

The model is solved taking into account the participation of hydropower. The output results of thermal power and hydropower are shown in Figure 3. Hydropower income is shown in Table 4. It can be seen that hydropower has exerted good regulating performance and made up for the lack of system flexibility. Most of the revenue from hydropower comes from the flexibility ramping market.

Table 3: Landslide conditions provided by thermal power units in the last 5 minutes

Table 4 Total cost of thermal power units

Table 5 Cost of insufficient system flexibility

In the description of this specification, reference to the terms "one embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the disclosure. in an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The basic principles, main features, and advantages of the present disclosure have been shown and described above. Those skilled in the industry should understand that the present disclosure is not limited by the above embodiments. What is described in the above embodiments and descriptions only illustrates the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure will also have other features. Various changes and improvements are possible, which fall within the scope of the claimed disclosure.

Claims (10)

1. A method for participating in flexible market trading when hydropower is not offered, the method comprising the steps of:

receiving grid basic data, wherein the grid basic data comprises: unit data, load data, new energy data and payload prediction error data;

calculating and obtaining the system flexibility requirement according to the net load prediction error data;

inputting the system flexibility requirement into a pre-established main energy and flexibility climbing market joint clearing model without considering the participation of water and electricity to obtain the system flexibility climbing shortage;

under the consideration of the participation of water and electricity, the system flexible climbing shortage is input into a pre-established main energy and flexible climbing market joint clearing model, and the water and electricity benefits are obtained.

2. The method for participating in flexible market trading when hydropower is not offered according to claim 1, wherein the net load is the total load minus the residual load after new energy power generation, and the net load prediction error consists of a load prediction error and a new energy prediction error.

3. A method of engaging in flexible market trading when hydropower is not bidding according to claim 1, wherein the system flexibility requirements include predicted payload fluctuations and uncertainty requirements.

4. A method of engaging in flexible market trading when hydropower is not bidding according to claim 3, wherein the predicted payload fluctuation is the change in payload for the next period of the system over the current period, and the uncertainty requirement is: the amount of demand that is additionally generated to meet the deviations within certain confidence intervals of the system payload predictions.

5. The method for participating in flexible market trading when hydropower is not offered according to claim 1, wherein the combined primary energy and flexible climbing market model is as follows:

minf＝C _G +C _F +C _I

wherein: c (C) _G Is the total cost of the thermal power generating unit; c (C) _F Insufficient cost for system flexibility; c (C) _I A punishment item is operated for the hydroelectric generating set, and:

wherein: a, a _i 、b _i Respectively quoting curve coefficients for the thermal power unit i;respectively, the climbing and landslide shortages of the thermal power generating unit i at the time t, namely the system flexibility is lackingA forehead; />For the state variable of the hydroelectric generating set k at the moment t, 1 represents startup and 0 represents shutdown; pi ^cap Is the upper limit of the system price; mu is the punishment coefficient of the operation of the hydroelectric generating set and is set to 10 ⁷ Thereby ensuring the short operation time of the hydroelectric generating set; n (N) _T The number of time segments for simulation; n (N) _G Is the number of generators.

6. The method for trading the flexible market when water and electricity are not offered according to claim 5, wherein the combined primary energy and flexible climbing market model considers the first two items C of the objective function when water and electricity participation is not considered _G And C _F The method comprises the steps of carrying out a first treatment on the surface of the Considering the first and third terms C of the objective function when considering the participation of water and electricity _G And C _I 。

7. The method for participating in flexible market trading when water and electricity are not offered according to claim 6, wherein the constraint conditions of the combined primary energy and flexible climbing market model are as follows:

a. electric quantity balance constraint:

wherein:for the output level of the thermal power unit i at time t,/->For the output level of the hydroelectric generating set k at time t, < >>Predicted payload for time t;

b. thermal power generating unit output constraint:

wherein: p (P) _G,i,max 、P _G,i,min Respectively representing the upper and lower limits of the output of the thermal power unit i;

c. climbing constraint of thermal power generating unit:

wherein: r is R _UG,i 、R _DG,i Respectively representing the upward climbing speed and the downward landslide speed of the thermal power unit i;

d. the output constraint of the hydroelectric generating set:

wherein: p (P) _H,k,max 、P _H,k,min The upper and lower limits of the output of the hydroelectric generating set k are respectively set;

e. climbing constraint of hydroelectric generating set:

wherein: r is R _UH,k 、R _DH,k Respectively representing the upward climbing speed and the downward landslide speed of the hydroelectric generating set k;

f. flexibility balances constraints:

wherein:upward and downward flexibility reserved for the thermal power generating unit i at the moment t respectively; /> Upward and downward flexibility reserved for the hydroelectric generating set k at the moment t respectively; FUS (functional unit) ^t 、FDS ^t The upward and downward flexibility requirements of the system at the time t are respectively as follows:

wherein: FUU (fluid handling unit) ^t+1 、FDS ^t+1 The uncertainty of the upward and downward of the system at the time t+1 is respectively;

g. thermal power generating unit flexibility output constraint:

h. flexible output constraint of hydroelectric generating set:

8. a method of engaging in a flexible market exchange when hydropower is not quoting according to claim 1, wherein the hydropower benefits comprise a main energy market benefit and a flexible uphill market benefit, wherein the main energy market benefit is the difference in total costs of thermal power when the hydropower engagement is not considered, respectively; the flexible climbing market benefit is the product of the system flexible climbing deficiency and the upper limit of the system price.

9. A system for participating in flexible market trading when hydropower is not bidding, comprising:

and a data acquisition module: for receiving grid base data, wherein the grid base data comprises: unit data, load data, new energy data and payload prediction error data;

the calculation module: the system flexibility requirement is calculated according to the net load prediction error data;

and the calculation module of the hydroelectric participation model is not considered: the system is used for inputting the system flexibility requirement into a pre-established main energy and flexibility climbing market joint clear model without considering the participation of water and electricity to obtain the system flexibility climbing shortage;

consider a hydropower participation model calculation module: the system is used for inputting the flexible climbing shortage of the system into a pre-established main energy and flexible climbing market joint clearing model under the consideration of the participation of water and electricity, so that the water and electricity benefits are obtained.

10. An apparatus, comprising:

one or more processors;

a memory for storing one or more programs;

a method of engaging in flexible market trading when one or more of said programs are executed by one or more of said processors, such that one or more of said processors implements a hydropower non-quotation as claimed in any one of claims 1 to 8.