KR102099013B1 - Operation method to the Combined Heat and Power Generation complying with the Demand of AGC and on the bases of Non self-constraint Bidding in the Power Trading System - Google Patents

Abstract

Various embodiments of the present invention relate to a method of operating a cogeneration system following automatic power generation control based on non-constrained bidding in a power transaction system, and a technical problem to be solved is to pay for fuel costs during cogeneration in accordance with unconstrained bidding and automatic generation control following a power transaction It is to provide a method for operating a combined heat and power generation system following automatic power generation control based on non-constrained bidding in a power transaction system that can prevent losses and secure economics of heat supply due to a decrease in the unit price of heat supply.
To this end, the present invention is a reheat medium pressure blocking valve and a reheat medium pressure flow control valve connected in series between a steam turbine which is a reheat medium pressure system and a low pressure heat exchanger, and a low pressure blocking valve and low pressure flow rate between a steam turbine which is a low pressure steam system and a low pressure heat exchanger. A method for operating a cogeneration unit connected in series with a regulated side, comprising: a power transaction bidding (non-constrained bidding) in which a restriction reason is not entered when a power generation system is bidding in a power transaction system; Performing an automatic power generation control to follow-up the power generation device with respect to the power system output request signal and frequency; And a power generation system non-constrained bidding-based automatic generation control tracking cogeneration operation method comprising a step of changing the electric output of the power generation device in real time.

Description

Operation method to the Combined Heat and Power Generation complying with the Demand of AGC and on the bases of Non self-constraint Bidding in the Power Trading System}

Various embodiments of the present invention relate to a method for driving a combined heat and power generation system following automatic power generation control based on non-constrained bidding in a power transaction system.

Seoincheon Combined Heat and Power Co., Ltd. completed its construction in 2013 and is currently performing a combined heat and power plant to supply heating water to local customers through a district heating and heat exchanger by drawing out a part of the steam heat of high pressure, medium pressure, and low pressure that mainly flows into the steam turbine in winter. have.

However, in the conventional heat supply method through cogeneration, the automatic power generation control device had to be released during operation after the pharmaceutical bidding in advance for a predetermined amount of heat extraction. Accordingly, there was a problem that economic efficiency was deteriorated, such as a decrease in power system follow-up due to the release of automatic power generation control, loss of electricity sales due to fixing of electrical output, and an increase in the price of heat supply. Accordingly, improved thermal power generation for the purpose of improving power system follow-up and securing economic feasibility of heat supply The need for a driving method was raised.

The above-described information disclosed in the background of the present invention is only for improving the understanding of the background of the present invention, and thus may include information that does not constitute the prior art.

The problem to be solved according to various embodiments of the present invention is to ultimately prevent fuel cost loss and at the same time heat supply cost, as it is possible to conduct non-constrained bidding of the power trading system during cogeneration and follow the automatic power generation control system operated by the power exchange. The aim is to provide a 'cooperative operation method for automatic power generation control based on non-constrained bidding based on a power transaction system' that can secure the economics of heat supply following a drop.

In various embodiments of the present invention, a reheat medium pressure blocking valve and a reheat medium pressure flow control valve are connected in series between a steam turbine which is a reheat medium pressure system and a low pressure heat exchanger, and a low pressure block valve between a steam turbine which is a low pressure steam system and a low pressure heat exchanger. A method for operating a cogeneration system connected in series with a low-pressure flow control variable, the power transaction bidding (non-constrained bidding) step of not entering a restriction reason when bidding the power generation system in the power transaction system; An automatic power generation control step of causing the power generation device to follow in response to a power system output request signal and frequency; And it characterized in that it comprises a step of changing the electric power in real time to change the electric power of the power generation device in real time.

The step of performing the automatic power generation control may include that the electrical output control of the power generation device is changed from a console (DCS: Distribute Control System) to a remote power supply automation facility (RTU: Remote Terminal Unit).

The opening degree of the reheat medium pressure blocking valve is maintained at 100% during the fluctuation phase between the electric outputs, and the opening degree of the reheat medium pressure flow control valve is fixed at 20 to 30%, and when the electric power increases, the steam withdrawal amount increases due to the increase in the reheat medium pressure steam pressure. , When the electric output falls, the steam withdrawal amount may decrease as the pressure of the reheat medium pressure steam decreases.

The opening of the low-pressure shut-off valve is maintained at 100% during the fluctuation phase between electric outputs, and the opening of the low-pressure flow control valve is fixed at 5 to 10%, and when the electric power rises, the steam withdrawal increases as the pressure of the low-pressure steam increases. When it falls, the steam withdrawal amount may decrease as the pressure of low-pressure steam decreases.

Depending on the steam pressure fluctuation, the supply amount of the reheat medium pressure steam and the low pressure supplied through the low pressure heat exchanger may be changed.

Various embodiments of the present invention are capable of conducting unconstrained bidding in power transactions and following automatic power generation control to prevent fuel cost loss during cogeneration, as well as to base the non-constrained bidding system on power transactions that can secure the economics of heat supply due to a drop in the heat supply price. Provides automatic power generation control tracking cogeneration operation method.

That is, the conventional heat supply method through cogeneration was required to release the automatic power generation control device at the time of operation after constraint bidding in advance for a predetermined amount of heat withdrawal. Accordingly, there was a problem in that economic feasibility such as loss of electricity sales and increase in the unit price of heat supply occurred. Accordingly, it provides an improved method for combined heat and power generation to improve the power system follow-up and secure the economics of heat supply.

1 is a block diagram showing a general power trading system constraint bid based automatic power generation control non-following cogeneration operation method.
FIG. 2 is a block diagram showing a method for driving automatic power generation control cogeneration based on non-constrained bidding in a power transaction system according to an embodiment of the present invention.
Figure 3 is a block diagram showing a method for operating a combined heat and power control automatic power generation control non-constrained bidding based on the power transaction system according to an embodiment of the present invention.
4 is a flow chart and control screen showing a method of operating a combined heat and power control following automatic power generation control based on non-constrained bidding of a power transaction system according to an embodiment of the present invention.
5 is a block diagram showing a method for operating a cogeneration system following automatic power generation control based on non-constrained bidding in a power transaction system according to an embodiment of the present invention.
6 is a block diagram showing a method for operating a cogeneration system following automatic power generation control based on non-constrained bidding in a power transaction system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully describe the present invention to those of ordinary skill in the art, and the following embodiments can be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the Examples. Rather, these examples are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, and the same reference numerals in the drawings refer to the same elements. As used herein, the term “and / or” includes any and all combinations of one or more of the listed items. In addition, in this specification, "connected" means not only when the A member and the B member are directly connected, but also when the C member is interposed between the A member and the B member to indirectly connect the A member and the B member. do.

The terminology used herein is used to describe a specific embodiment and is not intended to limit the present invention. As used herein, singular forms may include plural forms unless the context clearly indicates otherwise. Also, when used herein, "comprise, include" and / or "comprising, including" refer to the shapes, numbers, steps, actions, elements, elements and / or groups of these mentioned. It is to specify existence and not to exclude the presence or addition of one or more other shapes, numbers, actions, elements, elements and / or groups.

In addition, the description of the "constrained bidding", "automatic power generation control" and "thermal power ratio" frequently used in the present specification are as follows.

○ Self-constraint Bidding

In order to settle the amount of electricity sold, the power generation company must bid (input) the amount of electricity generated for each time in advance through the electricity exchange bidding system. In addition, during the actual generator operation after the bidding, the automatic power generation control must be followed (ON) so that the electric output of the generator is reacted (reacted) by the power exchange automatic generation control system or system frequency. However, in the bidding for winter heat supply, in order to supply steam heat to the maximum, the maximum value of the electricity output of the generator is set as the lower limit (limit), and pharmaceutical bidding is conducted. When bidding for pharmaceuticals, power generation companies will lose money due to reduced contribution to the electricity system and reduced sales revenue from electricity. Therefore, pharmaceutical bidding is conducted only when it is inevitable, such as heat supply and commissioning. Normally, automatic power generation control is performed (on, following) after unconstrained bidding (normal bidding) is conducted to increase sales sales of electricity.

○ Automatic Generation Control (AGC)

Automatic power generation control is a control concept in which a generator output and a frequency follow-up at a remote site are simultaneously performed by a power supply automation facility located at a power exchange, and is called Automatic Generation Control (AGC). However, if the power generation operator operates the generator after the automatic power generation control system is turned off (off, non-following) due to the company's circumstances, it will not contribute to the stability of the frequency of the power system, and consequently, the sales revenue of the power will be reduced. On the contrary, if the automatic power generation control is performed (ON, following), the sales revenue of the power amount increases.

○ Plant Heat Ratio

Thermoelectric ratio is the value of steam heat capacity produced per unit time divided by electricity production capacity on the basis of a cogeneration generator, based on the rated design load according to the Ministry of Trade, Industry and Energy Notice No. 2015-123 (Maximum heat production load per hour) Convert the electricity production capacity to heat, and calculate the heat transfer ratio in proportion to the heat production capacity.

Referring to FIG. 1, a block diagram of a general power trading system constraint bid based automatic power generation control non-following cogeneration operation method is shown.

First, as shown in FIG. 1, the cogeneration system includes a gas turbine, a boiler, a steam turbine, a high pressure heat exchanger, and a low pressure heat exchanger. Here, a high pressure control valve (H1) is connected between the boiler, the steam turbine and the high pressure heat exchanger, and a high pressure flow control valve (H2) is connected between the boiler and the high pressure heat exchanger. In addition, a reheat medium pressure control valve (M1) is connected between the boiler, the low pressure heat exchanger, and a steam turbine, and a reheat medium pressure flow control valve (M2) is connected between the boiler and the low pressure heat exchanger. In addition, a low pressure pressure shutoff valve (L1) is connected between the boiler, a steam turbine and a low pressure heat exchanger, and a low pressure flow control valve (L2) is connected between the boiler and the low pressure heat exchanger.

Under such a cogeneration system, the general power trading system pharmaceutical bidding-based automatic power generation control non-following cogeneration power generation method has previously completed the pharmaceutical bidding for heat supply and deactivated (OFF, non-following) the automatic power generation control system during generator operation on the day. After the maximum value of the gas turbine electric output is operated at the lower limit (limit) according to the bid amount, at this time, a large amount of high pressure, reheat medium pressure, low pressure steam flowing into the steam turbine is withdrawn, supplied to the local heat exchanger, and produced. Supply hot water for heating to the consumer.

Here, the heat ratio is 0.54 to 0.58, and the steam turbine output is approximately 42 to 46% of steam heat and 54 to 58% of electricity depending on the gas turbine output. The high-pressure heat exchanger has a heat exchange value of 60 Gcal / h, and the low-pressure heat exchanger has a heat exchange value of 30 Gcal / h in the case of large-scale steam heat extraction with the minimum operation of the electrical output and the maximum heat extraction amount.

Table 1 below is a table sequentially showing the operation method of a non-following cogeneration system based on the general power transaction system, pharmaceutical bidding, and automatic power generation control.

Turn fair One  Power transaction bidding (constrained bidding for heat supply) 2  Gas turbine and steam turbine electric output automatic power generation control release (AGC OFF) 3 Maintain the maximum value of gas turbine electric power (max. 182MW)
(However, the electric output of the steam turbine gradually decreases from the maximum (80MW) when the heat supply increases, and then remains after reaching the minimum (45MW)) 4 Boiler (HRSG) steam pressure decreases with increasing heat supply at maximum
(High pressure: 10%, Medium pressure: 30%, Low pressure: 50% reduction) High pressure system  High pressure control valve (H1) 100 → 30% closed and high pressure flow control valve (H2) 50% open Medium pressure system  Reheat medium pressure pressure regulating valve (M1) 100 → 30% closed and reheat medium pressure flow regulating valve (M2) 30% open Low pressure system  Low pressure pressure shutoff valve (L1) 100% open and low pressure flow control valve (L2) 40% open 5  Maintain maximum heat production (high pressure heat exchanger: 60Gcal / H, low pressure heat exchanger: 30Gcal / H)

In this way, in general, in the past, limited bidding was made in response to the increase in demand for short-term heat supply in winter by the consumer, and accordingly, the power system followingability was canceled due to the release of automatic power generation control (Off, non-following), and fixed electric output (constrained power generation). ), A loss in electricity sales occurred, and the heat supply cost increased.

Referring to FIG. 2, there is shown a block diagram of an automatic power generation control method for cogeneration based on a non-constrained bidding system in accordance with an embodiment of the present invention.

The power transaction system according to an embodiment of the present invention is based on the non-constrained bidding based automatic power generation control cogeneration operation method, and the non-constrained bidding (normal bidding) is completed in advance, and when the generator is operated on the same day, the gas turbine electric output automatically feeds the power exchange. After performing automatic power generation control (ON, following) so that it can be automatically controlled by facilities, some reheat medium and low pressure steam flowing into the steam turbine is withdrawn and supplied to the heat exchanger for district heating to supply the produced hot water to the consumer. In this way, the heat transfer ratio is 0.08 to 0.12, and the steam turbine output is about 8 to 12% of steam heat and 92 to 88% of electricity depending on the gas turbine load.

Table 2 below is a table sequentially showing a method of operating a non-following cogeneration system for automatic power generation control based on a pharmaceutical bidding system in accordance with an embodiment of the present invention.

Turn fair One  Electric power transaction bidding (normal bidding) 2  Gas turbine / steam turbine electrical output automatic power generation control (AGC ON) 3 Gas turbine / steam turbine electric output real-time fluctuation
(Gas turbine electric output fluctuation: average 175MW ~ minimum 100MW) 4 Boiler (HRSG) steam pressure real-time fluctuation
(The pressure of the medium and low pressure systems increases or decreases depending on the fluctuation of the electrical output) Medium pressure system  Reheat medium pressure control valve (M1) maintains 100% deployment and reheat medium pressure control valve (M2) maintains 30% partial opening Low pressure system  Low pressure pressure shutoff valve (L1) 100% maintenance and low pressure flow control valve (L2) 10% partial opening 5 Real-time fluctuation of heat supply according to increase and decrease of steam pressure according to fluctuation of electricity output
(Low pressure heat exchanger: 15 ~ 21Gcal / h, High pressure heat exchange process not implemented)

Table 3 below is a table comparing the general pharmaceutical bidding-based automatic power generation control non-following cogeneration operation method and the non-constrained bidding-based automatic power generation control following cogeneration operation method according to an embodiment of the present invention.

division Pharmaceutical bidding-based automatic power generation control non-following cogeneration (general) Non-constrained bidding based automatic power generation control following cogeneration (the present invention) How to bid Power transaction pharmaceutical bidding (heat supply contract) Non-constrained bidding for electricity trading (normal bidding) Electric output -Maximum operation of gas turbine (182MW)
-Minimum operation of steam turbine (45MW) Electric output real-time fluctuation
-Gas turbine electric output: 100 ~ 182MW
-Steam turbine electricity output: 65 ~ 75MW Pressure regulating valve -High pressure regulating valve 100 → 30% closed
-Medium pressure regulating valve 100 → 30% closed
-100% open of low pressure blocking valve -High pressure control valve not operated
-Medium pressure control valve 100% open
-100% open of low pressure blocking valve Flow control valve -Close up to 50% of high pressure flow control valve
-Close up to 30% of medium pressure flow control valve
-Low pressure flow control valve open up to 40% -High pressure flow control valve not operated
-Open up to 30% of medium pressure flow control valve
-Open up to 10% of low pressure flow control valve Heat withdrawal High pressure: 60, Low pressure: 30 Gcal / h withdrawal Low pressure: 15 ~ 21 Gcal / h withdrawal difference -No flexibility in equipment operation due to maximum heat withdrawal in a short time (am / pm / day)
-Process stability deterioration of this facility due to large amount of heat draw
-It is possible to increase the supply of the shortest time when the demand for heating increases rapidly due to the sudden drop in outside air in winter.
-High, medium and low pressure withdrawal of large amount increases water treatment cost -Flexible operation of facilities through regular and frequent steam heat extraction
-Process stability can be secured with a small amount of heat extraction
-Storage tanks can be stored with continuous heat draw-out to prepare for normal demand, but there is a possibility of insufficient supply when heating demand surges due to the sudden drop in outside air in winter.
-The water treatment cost is reduced due to the small and medium pressure withdrawal

Referring to Table 3, the general method is to apply automatic bidding control in order to supply the heating water in the winter area, and then, in order to maintain electricity output at the maximum during actual generator operation, turn off automatic power generation control (OFF, After non-following), the combined heat and power generation method provides a large amount of high, medium, and low pressure steam heat generated while maintaining the maximum gas turbine electrical output. Each of the three flow control valves is constant in the range of 30-50%. Is maintained.

However, in the method according to the embodiment of the present invention, normal bidding (non-constraining bidding) is performed before steam restriction to supply steam heat, and automatic power generation control is performed (ON, following) after actual generator operation. Depending on the real-time fluctuation of the gas turbine electric output, the heat withdrawal increases when the output increases, and the heat withdrawal decreases when the output decreases. , Draw out only low pressure steam heat. The opening degree of each flow control valve is maintained at the proper opening degree (approximately 10% to 30%) adjusted to the minimum gas turbine electric power (100MW), and when the electric power increases, the steam pressure increases and the withdrawal amount increases.

Table 4 below shows the results of the demonstration test and pilot operation of the combined power generation system based on non-constrained bidding based on automatic power generation control according to an embodiment of the present invention.

Table 5 is a table summarizing the low-pressure heat exchange withdrawal capacity for each of the minimum-middle-maximum output sections according to the automatic power control tracking cogeneration method based on non-constrained bidding in the power transaction system according to an embodiment of the present invention.

Gas turbine electricity output (MW) 100MW (minimum) 120MW 140MW 170MW 182MW (max) Reheating medium pressure (Kg / cm ² ) 17.3 18.1 19.3 21.8 23 Low pressure pressure (Kg / cm ² ) 3.0 3.1 3.4 3.5 3.5 Low pressure heat exchanger flow rate (Gcal / hr) 15 16.5 17.7 18.7 20.7

As shown in Table 5, it can be seen that the heat extraction amount of the low pressure heat exchanger at the gas turbine minimum output of 100 MW is approximately 15 Gcal, and the heat extraction amount of the low pressure heat exchanger at the gas turbine maximum output of 182 MW is approximately 21 Gcal.

Table 6 is a table summarizing the results of proper pressure verification without affecting the main pressure system of the steam turbine at the minimum output of the gas turbine according to the automatic power control tracking cogeneration method based on the non-constrained bidding of the power transaction system according to the embodiment of the present invention.

Gas turbine electricity output (MW) 100MW (minimum) 120MW 140MW 170MW 182MW (max) Reheating medium pressure (Kg / cm ² ) 17.3 18.1 19.3 21.8 23 Auxiliary steam pressure (Kg / cm ² ) 14.6 14.5 14.4 21.3 22.5 Low pressure heat exchanger flow rate (Gcal / hr) 15 16.5 18 21 21.3

As shown in Table 6, it can be seen that the reheat medium pressure of 17.3 K and auxiliary steam pressure of 14.6 K are maintained at the minimum gas turbine output of 100 MW, and also the reheat medium pressure of 23 K and auxiliary steam pressure of 22.5 K at the maximum gas turbine output of 182 MW. You can see it keeps.

Table 7 is a table showing the main system pressure fluctuations for the minimum-medium-maximum output section and the heat withdrawal of the low-pressure heat exchanger according to the automatic power control tracking cogeneration method based on the non-constrained bidding of the power trading system according to the embodiment of the present invention. to be.

Gas turbine electricity output (MW) 100MW (minimum) 120MW 140MW 170MW 182MW (max) Reheating medium pressure (Kg / cm ² ) 17 18 19 22 23 Low pressure pressure (Kg / cm ² ) 3.0 3.1 3.4 3.5 3.5 Low pressure heat exchanger flow rate (Gcal / hr) 15 16.5 18 21 21.3

Table 8 is a table showing the relationship of power generation facility impact review, analysis, and protection logic establishment according to the power generation system non-constrained bidding based automatic power generation control cogeneration method according to an embodiment of the present invention.

Gas turbine electricity output (MW) 100MW (minimum) 120MW 140MW 170MW 182MW (max) Reheating medium pressure (Kg / cm ² ) 17.3 18.1 19.3 21.8 23 Auxiliary steam pressure (Kg / cm ² ) 14.6 14.5 14.4 21.3 22.5 Low pressure heat exchanger flow rate (Gcal / hr) 15 16.5 18 21 21.3

In other words, if the pressure of reheat and medium pressure decreases during heat supply, factors such as low temperature and medium pressure drop and subsidiary steam pressure continue to occur.

Accordingly, the main pressure system protection logic was established to secure facility stability. As an example, a limiting logic was opened to open the reheat medium-pressure flow control valve 30% and open the low-pressure flow control valve 10% or more. Also, when the auxiliary steam pressure drops to 14K, a logic for rapidly closing the reheat medium pressure flow control valve is newly established.

Referring to FIG. 3, there is shown a block diagram of an automatic power generation control tracking cogeneration operation method based on non-constrained bidding in a power transaction system according to an embodiment of the present invention.

As shown in FIG. 3, the cogeneration unit 100 has a reheat medium pressure blocking valve 114 and a reheat medium pressure flow control valve 115 between a steam turbine 111 which is a reheat medium pressure system and a low pressure heat exchanger 112. Connected in series, a low pressure shut-off valve 116 and a low-pressure flow control valve 117 may be connected in series between the low-pressure steam system steam turbine 111 and the low-pressure heat exchanger 112. Here, the reheat medium pressure pressure regulating valve 113 may be further connected between the steam turbine which is the reheat medium pressure system and the reheat medium pressure blocking valve 114.

The power transaction system non-constrained bid based automatic power generation control cogeneration operation method according to an embodiment of the present invention may include the following steps.

Step 1: Advance bidding for unconstrained bidding for electricity (normal bidding)

Step 2: Perform automatic power generation control (AGC) (ON, follow-up) Cogeneration

That is, the generator electrical output control mode is selected from DCS to RTU on the operation console (control monitor) for tracking the power system output request signal and following the frequency.

Here, the DCS (Distribute Control System) is a control system that processes information and commands for the main equipment of power generation equipment such as output of power generation equipment, and mainly performs commands for main equipment in a driving console (control monitor). In addition, a remote terminal unit (RTU) is a power supply automation facility that controls the electrical output of a remote power generation device. The electrical output control value of the power generation device is changed according to changes in the real-time situation of the power system such as frequency fluctuations.

Step 3: Maintain 100% deployment state of the reheat medium pressure pressure regulating valve 113 and maintain partial opening (30%) of the reheat medium pressure flow regulating valve 115 during cogeneration.

Step 4: Maintain 100% deployment state of the low pressure shutoff valve 116 during cogeneration, and maintain the partial opening (10%) of the low pressure flow control valve 117

Step 5: Supply of steam heat from the low-pressure heat exchanger 112 for regional warming (15 to 21 Gcal / h supplied per reheat medium pressure steam and low pressure steam)

In this way, according to an embodiment of the present invention, it is possible to prevent fuel cost loss during cogeneration by following non-constrained bidding in the electricity transaction and following automatic power generation control, and also secure heat supply economic efficiency due to a decrease in the heat supply unit cost.

Referring to FIG. 4, a flow chart and a control screen are shown for a method of operating a combined power generation system based on non-constrained bidding for automatic power control according to an embodiment of the present invention.

As shown in Figure 4, the power transaction system non-constrained bidding based automatic power generation control cogeneration operation method according to an embodiment of the present invention is a power transaction bidding that does not enter a constraint reason when bidding a power generation device in a power transaction system ( Non-constrained bidding) step (S1), automatic power generation control execution step (S2) of tracking and controlling the power generation device with respect to the power system output request signal and frequency, and electric power real-time change step of changing the electric power of the power generation device in real time (S3).

Here, the step of performing the automatic power generation control based on the non-constrained bidding of the power transaction system in the cogeneration may include changing the electrical output control of the power generation device from a console (DCS) to a remote power supply automation facility (RTU).

Referring to FIG. 5, there is shown a block diagram of an automatic power generation control tracking cogeneration operation method based on non-constrained bidding in a power transaction system according to an embodiment of the present invention.

As shown in FIG. 5, when the heat generation process of auto-generation control following reheat medium pressure steam during cogeneration is observed, the opening degree of the reheat medium pressure blocking valve 114 is maintained at 100% in the fluctuation stage between electric outputs, and the reheat medium pressure flow rate The opening of the regulating valve 115 is fixed at 20 to 30% (preferably, 30%), but when the electric power rises, the steam withdrawal amount increases as the pressure of the reheat medium pressure increases, and when the electric power decreases, the pressure of the reheat medium pressure steam decreases. It can be seen that the steam withdrawal amount is reduced according to the.

Referring to FIG. 6, there is shown a block diagram of an automatic power generation control tracking cogeneration operation method based on non-constrained bidding in a power transaction system according to an embodiment of the present invention.

As shown in FIG. 6, in the cogeneration process, the automatic power generation control follow-up low pressure steam heat drawing process shows that the opening of the low pressure shut-off valve 116 is maintained at 100% in the fluctuation stage between electric outputs, and the low-pressure flow control valve ( The opening degree of 117) is fixed at 5 ~ 10%, but it can be seen that the steam withdrawal amount increases as the low pressure steam pressure rises when the electric power rises, and the steam withdrawal amount decreases as the low pressure steam pressure decreases when the electric power decreases.

In this way, the power transaction system non-constrained bidding-based automatic power generation control tracking cogeneration operation method according to an embodiment of the present invention performs power transaction bidding (normal bidding)-> automatic power generation control execution (On, tracking)-> electricity output It is carried out in a method of inter-variation-> variation between steam pressure implementation-> heat supply. Here, the fluctuation between the heat supply amount implementation means that the supply amount of the reheat medium pressure steam and the low pressure steam supplied through the low pressure heat exchanger 112 changes according to the fluctuation of the steam pressure.

Accordingly, the embodiment of the present invention can prevent fuel cost loss during cogeneration by following unenforced bidding and automatic power generation control in the power transaction, and also secure heat supply economic efficiency due to a decrease in the unit price of heat supply.

What has been described above is only one embodiment for implementing the power transaction system non-constrained bidding-based automatic power generation control cogeneration operation method according to the present invention, and the present invention is not limited to the above-described embodiment, and the following patents As claimed in the claims, any person skilled in the art to which the present invention pertains without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various changes can be made.

100; Cogeneration system
111; Steam turbine
112; Low pressure heat exchanger
113; Reheating medium pressure control valve
114; Reheat medium pressure blocking valve
115; Reheat medium pressure flow control valve
116; Low pressure blocking valve
117; Low pressure flow control valve

Claims (5)

Gas turbines, boilers connected to gas turbines, steam turbines with high-pressure turbines, medium-pressure turbines and low-pressure turbines connected to boilers, high-pressure pressure control valves installed between high-pressure systems and high-pressure heat exchangers and high-pressure turbines of boilers, high-pressure systems and high-pressure systems of boilers High pressure flow control valve installed between turbine and high pressure heat exchanger, reheat medium pressure system of boiler and reheat medium pressure blocking valve installed between low pressure heat exchanger and medium pressure turbine, reheat medium pressure system of boiler and between low pressure heat exchanger and medium pressure turbine to reheat medium pressure blocking valve Reheat medium pressure flow control valve installed in series, low pressure shutoff valve installed between low pressure system and low pressure heat exchanger and low pressure turbine of the boiler, low pressure flow rate control installed in series on low pressure shutoff valve between low pressure system and low pressure heat exchanger and low pressure turbine of the boiler In the method of operating a cogeneration device comprising a stool,
A power transaction bidding (non-constrained bidding) step in which a restriction reason is not entered when the power generation device is bidding in the power transaction system;
An automatic power generation control performing step of controlling the power generation device following the power system output request signal and frequency; And
Including the step of changing the electric power in real time to change the electric power of the power generation device in real time,
The high pressure pressure control valve and the high pressure flow control valve are not operated, and the reheat medium pressure blocking valve, reheat medium pressure flow control valve, low pressure blocking valve, and low pressure flow control valve are operated.
The opening degree of the reheat medium pressure blocking valve is maintained at 100% during the fluctuation phase between the electric outputs, and the opening degree of the reheat medium pressure flow rate control valve is fixed at 20-30%. , When the electricity output decreases, the steam withdrawal amount decreases as the reheat medium pressure steam pressure decreases,
The opening of the low-pressure shut-off valve is maintained at 100% during the fluctuation phase between electric outputs, and the opening of the low-pressure flow control valve is fixed at 5 to 10%. A power trading system based on non-constrained bidding based automatic power generation control and combined heat and power operation method, characterized in that the steam withdrawal amount decreases when the low pressure steam pressure decreases when the pressure drops. According to claim 1,
Power generation system non-constrained bidding-based automatic, characterized in that the step of performing automatic power generation control includes changing the electrical output control of the power generation device from a console (DCS: Distribute Control System) to a remote power supply automation facility (RTU: Remote Terminal Unit). Power generation control tracking cogeneration operation method. delete delete According to claim 1,
Power transaction system non-constrained bidding based automatic power generation control following cogeneration operation method, characterized in that the supply volume of reheat medium pressure steam and low pressure steam supplied through a low pressure heat exchanger varies according to steam pressure fluctuation.

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