KR20200025279A - 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

According to various embodiments of the present invention, the present invention relates to a method for operating automatic power generation control-following cogeneration based on non-restricted bidding of a power transaction system, which is to prevent loss of fuel costs during cogeneration by non-restricted bidding execution on power transaction and automatic power control following, and to secure economic feasibility of heat supply in response to a decrease in a heat supply cost. To this end, the method for operating a cogeneration device in which a reheating middle-pressure blocking side and a reheating middle-pressure flow rate control side are connected in series between a steam turbine which is a reheating middle-pressure system and a low-pressure heat exchanger, and a low-pressure blocking side and a low-pressure flow rate control side are connected in series between a steam turbine which is a low-pressure steam system and the low-pressure heat exchanger, comprises: a power transaction bidding step (non-restricted bidding) in which a restriction reason is not input in case of bidding of a power generation device in a power transaction system; an automatic power generation control performing step of following and controlling the power generation device for a power system output request signal and a frequency; and an electricity output real-time change step of changing electricity 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 operating a cogeneration system based on non-constrained bidding based on a power transaction system.

The Seoincheon Combined Cycle Cogeneration Facility completed the construction in 2013, and has carried out cogeneration to supply heating water to local consumers through district heating heat exchangers by drawing some of the high-pressure, medium- and low-pressure steam heat flowing into the steam turbine in winter. have.

However, the conventional heat supply method through cogeneration had to release the automatic power generation control device during the operation after the constraint bidding for the predetermined amount of heat extraction. As a result, the economic feasibility of the power system is reduced due to the release of automatic power generation control, the loss of power sales due to the fixed power output, and the cost of heat supply is increased. The need for a driving method has been raised.

The above-described information disclosed in the background technology 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 prevent non-constrained bidding of the power trading system and to follow the automatic power generation control system operated by the power exchange in the event of cogeneration, ultimately preventing fuel cost loss and heat supply cost. It is to provide a 'cooperative method of operating cogeneration with automatic power generation control based on non-constrained bidding of electric power trading system' that can secure economical supply of heat due to the decline.

According to various embodiments of the present disclosure, a reheat medium pressure cutoff 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 cutoff valve, which is connected between a steam turbine and a low pressure heat exchanger, which is a low pressure steam system. A method of operating a cogeneration system in which a low pressure flow control valve is connected in series, the method comprising: a power transaction bidding (non-constrained bidding) step of not inputting a reason for restriction in bidding of a generator in a power trading system; Performing automatic power generation control to follow the power generation device in response to the power system output request signal and frequency; And it characterized in that it comprises a step of changing the electrical output real-time to change the electrical output of the generator in real time.

The automatic power generation control step may include changing the electrical output control of the power generation device from a console (DCS) to a remote terminal unit (RTU).

The opening degree of the reheating pressure cutoff valve is maintained at 100% and the opening degree of the reheating pressure flow control valve is fixed at 20 to 30% during the step of changing the electric output. However, the steam withdrawal may be reduced when the reheating steam pressure decreases when the electrical output drops.

The opening degree of the low pressure cutoff valve is maintained at 100% and the opening degree of the low pressure flow control valve is fixed at 5 to 10% in the step of changing the electric output during the execution of the electric output. When lowered, the withdrawal of steam can be reduced by lowering the low pressure steam pressure.

As the steam pressure fluctuates, the reheat medium pressure steam and the low pressure steam supplied through the low pressure heat exchanger may be changed.

Various embodiments of the present invention can be carried out in the non-constrained bidding in the power transaction and follow the automatic power generation control based on the non-constraint bidding power system that can prevent the loss of fuel during cogeneration and secure the economics of heat supply due to the decrease in the price Provides automatic generation control following cogeneration operation method.

In other words, the conventional heat supply method through cogeneration has to release the automatic power generation control device during operation after restrictive bidding for the predetermined amount of heat withdrawal. There is a problem that economic efficiency is deteriorated, such as loss of electricity sales and increase in heat supply unit price. Therefore, it provides an improved method of operating an integrated thermal power plant for improving power system followability and securing economic efficiency of heat supply.

FIG. 1 is a block diagram illustrating a method for operating a non-following cogeneration system based on a general power trading system constraint bidding.
2 is a block diagram illustrating a method of operating a cogeneration system based on a non-constrained bid based automatic power generation control according to an embodiment of the present invention.
3 is a block diagram illustrating a method for operating a cogeneration system based on a non-constrained bid based automatic power generation control according to an embodiment of the present invention.
4 is a flowchart and a control screen illustrating a method for operating a cogeneration system based on non-constrained bidding based on a power transaction system according to an embodiment of the present invention.
5 is a block diagram illustrating a method for operating a cogeneration system based on non-constrained bidding based on a power trading system according to an embodiment of the present invention.
FIG. 6 is a block diagram illustrating a method for operating a cogeneration system based on a non-constrained bid based automatic power generation control according to an embodiment of the present invention.

Hereinafter, exemplary 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 explain the present invention to those skilled in the art, and the following examples can be modified in many different forms, and the scope of the present invention is as follows. It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept 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, 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, the term "connected" in this specification means not only the case where the A member and the B member are directly connected, but also the case where the A member and the B member are indirectly connected by interposing the C member between the A member and the B member. do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. Also, as used herein, "comprise, include" and / or "comprising, including" means that the features, numbers, steps, operations, members, elements, and / or groups thereof mentioned. It is intended to specify the existence and not to exclude the presence or addition of one or more other shapes, numbers, operations, members, elements and / or groups.

In addition, the "pharmaceutical bidding", "automatic power generation control" and "heat transfer ratio" which are frequently used in the present specification will be described as follows.

Self-constraint Bidding

In order to settle the electricity sales price, the generators must bid (input) the generation amount by time through the power exchange bidding system. In addition, during the actual generator operation after bidding, the automatic power generation control must be turned on so that the electrical output of the generator is reacted by the power exchange automatic power generation control system or the system frequency. However, when bidding for the heat supply in winter, pharmaceutical bidding is conducted by setting the maximum value of the electric power of the generator to the lower limit (limit) in order to supply steam heat to the maximum value. In the case of pharmaceutical bidding, power generation companies will lose money due to lower contribution to the electricity system and lower sales of electricity. Therefore, pharmaceutical bidding is conducted only when it is inevitable, such as heat supply and commissioning. Usually, automatic power generation control (On, following) operation is performed after non-constraint bidding (normal bidding) to increase sales revenue.

○ Automatic Generation Control (AGC)

Automatic generation control is a control concept in which power generation automation facilities in power exchanges simultaneously perform remote generator output and frequency tracking. It is called Automatic Generation Control (AGC). However, if the power generation company operates the generator after releasing the automatic power generation control system (OFF, non-following) due to its own circumstances, it will not contribute to the stabilization of the power system, resulting in a decrease in the sales volume of electricity. On the contrary, if the automatic power generation control is executed (ON, following), the sales revenue of electric power increases.

○ Plant Heat Ratio

The heat transfer ratio is the steam heat capacity produced per unit time based on the cogeneration generator divided by the electricity production capacity. Based on the rated design load in accordance with the 2015-123 Notice of the Ministry of Trade, Industry and Energy. (Maximum heat production load per hour) Calculate the heat transfer ratio by converting the electricity production capacity into calories.

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

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, the high pressure control valve (H1) is connected between the boiler, the steam turbine and the high pressure heat exchanger, and the high pressure flow control valve (H2) is connected between the boiler and the high pressure heat exchanger. In addition, the reheat medium pressure control valve (M1) is connected between the boiler, the low pressure heat exchanger and the steam turbine, and the reheat medium pressure flow control valve (M2) is connected between the boiler and the low pressure heat exchanger. In addition, between the boiler, steam turbine and the low pressure heat exchanger is connected to the low pressure shutoff valve (L1), the low pressure flow control valve (L2) is connected between the boiler and the low pressure heat exchanger.

Under this cogeneration system, the non-follow cogeneration operation method based on the general power trading system constraint bidding is to complete the constraint bid for the heat supply in advance and turn off the auto generation control system (OFF, non-following) during the generator operation on the day. After the maximum value of the gas turbine electric output is operated to the lower limit (limit) according to the bidding amount, at this time, a large amount of high pressure, reheat medium pressure, low pressure steam flowing into the steam turbine is drawn out and supplied to the district heating heat exchanger. Supply hot water for heating to the customer.

Here, the thermal 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 is 60 Gcal / h, and the low pressure heat exchanger has a heat exchange value of 30 Gcal / h for the large-scale steam heat withdrawal operation with the minimum electrical output and maximum heat withdrawal.

Table 1 below is a table sequentially showing the non-following cogeneration operation method based on the general power trading system constraint bidding.

Turn fair One  Electric power bidding (pharmaceutical bidding for heat supply) 2  Automatic generation control release for gas turbine and steam turbine (AGC OFF) 3 Maintains fixed gas turbine electrical output (max. 182 MW)
(However, the steam turbine electric output gradually decreases from the maximum value (80MW) when the heat supply increases, and is maintained after reaching the minimum value (45MW).) 4 Boiler (HRSG) steam pressure decreases with increasing heat supply at maximum
(High pressure: 10%, Medium pressure: 30%, Low pressure: 50% decrease) High pressure system  High pressure control valve (H1) 100 → 30% closed and High pressure flow control valve (H2) 50% open Medium pressure system  Reheating pressure control valve (M1) 100 → 30% closed and Reheating pressure flow control valve (M2) 30% open Low pressure system  Low pressure shutoff valve (L1) 100% open and low pressure flow control valve (L2) 40% open 5  Maintain maximum heat output (high pressure heat exchanger: 60Gcal / H, low pressure heat exchanger: 30Gcal / H)

In this way, in general, constraint bidding was made in accordance with the increase in demand for short-term heat supply in winter, and accordingly, power system followability due to automatic power generation control off (off, non-following) decreased, and electric power was fixed (pharmaceutical power generation). ), The loss of electricity sales, and the price of heat supply rose.

2, a block diagram of a method for operating a cogeneration system based on non-constraint bidding based automatic power generation control according to an embodiment of the present invention is shown.

According to an embodiment of the present invention, a non-constraint bidding-based automatic generation control following cogeneration operation method according to an embodiment of the present invention completes a non-constraint bidding (normal bidding) in advance, and the power output of the gas turbine is automatically supplied to the power exchange during the generator operation on the day. After performing automatic power generation control (ON, following) to be automatically controlled by the facility, draw out some reheated medium pressure steam and low pressure steam flowing into the steam turbine, supply it to the district heating heat exchanger, and supply hot water for heating to the customer. In this way, the thermal ratio is 0.08 ~ 0.12, the steam turbine output is about 8-12% steam heat, 92-88% electricity, depending on the gas turbine load.

Table 2 below is a table sequentially showing a non-cogeneration cogeneration operation method based on power bidding system constraint bidding according to an embodiment of the present invention.

Turn fair One  Power deal bidding (normal bidding) 2  Automatic generation control of gas turbine / steam turbine (AGC ON) 3 Gas Turbine / Steam Turbine Electrical Output
(Gasbin electric power fluctuation: average 175MW ~ minimum 100MW) 4 Boiler (HRSG) steam pressure real-time fluctuation
(Medium pressure and low pressure increase or decrease according to the change of electric output) Medium pressure system  Reheat pressure control valve (M1) maintains 100% development and reheat pressure flow control valve (M2) maintains 30% partial opening Low pressure system  Low pressure pressure cutoff valve (L1)) 100% development state and low pressure flow control valve (L2) 10% partial opening 5 Real-time fluctuation of heat supply according to the increase or decrease of steam pressure
(Low pressure heat exchanger: 15 ~ 21Gcal / h, no high pressure heat exchange process)

Table 3 below is a table comparing the general constraints-based automatic generation control non-cogeneration cogeneration operation method and the non-constraint bidding-based automatic generation control tracking cogeneration operation method according to the embodiment of the present invention.

division Pharmaceutical bidding-based automatic generation control non-cogeneration cogeneration (general) Non-pharmaceutical bidding-based automatic generation control following cogeneration (invention) How to bid Restricted bidding for electricity trade (heat supply contract) Non-Constraint Bidding (Normal Bidding) Electrical output Maximum gas turbine operation (182 MW)
-Minimum operation of steam turbine (45MW) Electric output real time fluctuation
Gas turbine electrical output: 100 ~ 182MW
-Steam turbine electric output: 65 ~ 75MW Pressure regulating valve -100 → 30% closing of high pressure control valve
-100 → 30% closing of pressure control valve
-100% opening of low pressure cutoff -No operation of high pressure control valve
-100% pressure relief valve
-100% opening of low pressure cutoff Flow control valve -Closed up to 50% of high pressure flow control valve
-Closed up to 30% of medium pressure flow control valve
-Opening up to 40% of low pressure flow control valve -No operation of high pressure flow control valve
-Medium pressure flow regulating valve open up to 30%
-Low pressure flow control valve open up to 10% Heat withdrawal High pressure: 60, low pressure: 30Gcal / h withdrawal Low pressure: 15 ~ 21Gcal / h withdrawal difference -No flexibility in operating the equipment due to maximum heat withdrawal in a short time (am / pm / day)
-Deterioration of process stability of this facility due to large amount of heat withdrawal
-In case of rapid increase in demand for heating due to drastic outdoor air fall during winter season, supply volume can be increased
-Increased water treatment costs due to high, medium and low pressure withdrawal -Flexibility in operating the facility due to the steam heat withdrawal at any time
-A small amount of heat withdrawal ensures the stability of the process
-Storage tank can be stored by continuous heat drawing, so it is possible to prepare for normal demand, but there is a possibility of supply shortage in case of sudden increase in heating demand due to drastic outdoor air fall during winter season.
-Reduced water treatment costs due to low and medium pressure withdrawal

Referring to Table 3, after the general bidding for the supply of heating water in the winter season, the general bidding method is released, and then the automatic power generation control is turned off to maintain the maximum electric power output during the actual generator operation. Co-generation after unfollowing, it supplies a large amount of high-pressure, medium-pressure, low-pressure steam heat generated while maintaining the gas turbine's maximum output power.The three flow control valves are constant within the range of 30 ~ 50%. Is maintained.

However, the method according to the embodiment of the present invention performs a normal bidding (non-constrained bidding) in advance of the bidding for the steam heat supply, and performs automatic power generation control (ON, following) during actual generator operation. According to the real-time variation of the gas turbine electrical output, the heat draw amount increases when the output increases and the heat draw amount decreases when the output decreases. Unlike the conventional method, the high pressure is excluded due to the output variability. Only draw low pressure steam. The opening of each flow control valve is maintained at the appropriate opening (approximately 10% to 30%) adjusted to the gas turbine minimum electric output (100MW), and as the electric output increases, the steam pressure increases to increase the withdrawal amount.

Table 4 below shows the results of the cogeneration test and the test operation of the cogeneration system based on the non-constrained bidding of the power transaction system according to the embodiment of the present invention.

Table 5 is a table summarizing the low-pressure heat exchange withdrawal capacity for each of the minimum, middle and maximum output intervals according to the non-constraint bidding-based automatic generation control following cogeneration method according to the embodiment of the present invention.

Gas turbine electrical output (MW) 100 MW (min) 120 MW 140 MW 170 MW 182 MW (max) Reheat Medium Pressure (Kg / cm ² ) 17.3 18.1 19.3 21.8 23 Low 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 low pressure heat exchanger heat withdrawal is approximately 15 Gcal at the gas turbine minimum output of 100 MW, and the low pressure heat exchanger heat withdrawal is approximately 21 Gcal at the gas turbine maximum output of 182 MW.

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

Gas turbine electrical output (MW) 100 MW (min) 120 MW 140 MW 170 MW 182 MW (max) Reheat 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 reheating pressure 17.3 K and the auxiliary steam pressure 14.6K are maintained at the gas turbine minimum output of 100 MW, and the reheating pressure 23K and the auxiliary steam pressure 22.5K are maintained at the maximum gas turbine output of 182 MW. You can see it staying.

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

Gas turbine electrical output (MW) 100 MW (min) 120 MW 140 MW 170 MW 182 MW (max) Reheat Medium Pressure (Kg / cm ² ) 17 18 19 22 23 Low 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 between the power generation system impact review, analysis and protection logic newly established according to the non-constraint bidding-based automatic generation control tracking cogeneration method according to an embodiment of the present invention.

Gas turbine electrical output (MW) 100 MW (min) 120 MW 140 MW 170 MW 182 MW (max) Reheat 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, in case of reheating pressure drop during heat supply, factors such as low temperature pressure drop and auxiliary steam pressure drop exist, power generation equipment instability still exists.

Accordingly, major pressure system protection logic was established to secure facility stability. As an example, the logic for opening the reheat medium pressure flow control valve opening 30% and the low pressure flow control valve opening 10% or more was newly established. In addition, when the auxiliary steam pressure is lowered to 14K, the reclosed pressure flow control valve is rapidly closed.

Referring to FIG. 3, a block diagram of a method for operating a cogeneration system based on a non-constraint bidding based automatic power generation control according to an embodiment of the present invention is shown.

As shown in FIG. 3, the cogeneration device 100 includes a reheating pressure interrupting valve 114 and a reheating pressure flow control valve 115 between a steam turbine 111 and a low pressure heat exchanger 112, which are reheating and pressure reducing systems. It is connected in series, the low pressure blocking side 116 and the low pressure flow control valve 117 may be connected in series between the steam turbine 111 and the low pressure heat exchanger 112 of the low pressure steam system. Here, the reheating pressure control valve 113 may be further connected between the steam turbine, which is a reheating pressure system, and the reheating pressure blocking valve 114.

According to an embodiment of the present invention, a method for operating a non-constraint bidding-based automatic generation control following cogeneration system according to an embodiment of the present invention may include the following steps.

Step 1: Implement non-constrained bidding (normal bidding) in advance

Phase 2: Perform Automatic Generation Control (AGC) (ON, Following) Cogeneration

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

Here, the DCS (Distribute Control System) is a control system that processes information and commands on the main equipment of the power generation equipment such as the output of the power generation apparatus. In addition, RTU (Remote Terminal Unit) is a power supply automation facility that controls the electrical output of the remote power generation unit, the electrical output control value of the power generation unit is changed according to the real-time situation of the power system, such as frequency change.

Step 3: Maintain 100% deployment of reheat pressure control valve 113 and partial opening (30%) of reheat pressure control valve 115 during cogeneration.

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

Step 5: Steam heat supply of the local heating low pressure heat exchanger 112 (15-21 Gcal / h supply for each output reheated steam and low pressure steam)

In this way, according to the embodiment of the present invention it is possible to prevent the loss of fuel costs during cogeneration according to the non-constrained bidding on the power transaction and follow the automatic power generation control, and also to secure the heat supply economy due to the decrease in the heat supply price.

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

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

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

Referring to FIG. 5, a block diagram of a method for operating a cogeneration system based on non-constraint bidding based automatic power generation control according to an embodiment of the present invention is shown.

As shown in FIG. 5, when the cogeneration is taken into account, the automatic power generation control following reheated steam steam withdrawal process shows that the opening degree of the reheated pressure cutoff valve 114 is maintained at 100% in the step of changing the power output during the regeneration. The opening of the control valve 115 is fixed at 20 to 30% (preferably 30%), but when the electric power rises, the steam withdrawal increases due to the reheated steam pressure increases, and when the electric power drops, the reheated steam pressure decreases. As can be seen the amount of steam withdrawal is reduced.

Referring to FIG. 6, a block diagram of a method for operating a cogeneration system based on non-constraint bidding based automatic power generation control according to an embodiment of the present invention is shown.

As shown in FIG. 6, when the cogeneration is taken, the automatic power generation control-following low pressure steam heat extraction process shows that the opening degree of the low pressure cut-off side 116 is maintained at 100% in the step of changing the power output during the low power flow control valve ( The opening degree of 117) is fixed at 5 ~ 10%, but it can be seen that the amount of steam withdrawal due to the increase in the low pressure steam pressure increases when the electric power rises, and the amount of steam withdrawal decreases due to the decrease in the low pressure steam pressure when the electric power drops.

In this way, the power generation system non-constrained bidding-based automatic generation control following cogeneration operation method according to an embodiment of the present invention, power transaction bidding (normal bidding)-> automatic generation control execution (On, following)-> electric power implementation Between fluctuations-> steam pressure fluctuations-> heat supply fluctuations. Here, the variation between the execution of the heat supply amount means that the supply amount of the reheat medium pressure steam and the low pressure steam supplied through the low pressure heat exchanger 112 is changed according to the steam pressure variation.

Therefore, the embodiment of the present invention can prevent the loss of fuel cost during cogeneration according to the non-constrained bidding on the power transaction and follow the automatic power generation control, and also secure the heat supply economics due to the decrease in the heat supply unit price.

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

100; Cogeneration Unit
111; Steam turbine
112; Low pressure heat exchanger
113; Reheat Medium Pressure Control Valve
114; Reheat medium pressure cutoff side
115; Reheat Medium Pressure Flow Control Valve
116; Low pressure cutoff side
117; Low pressure flow control valve

Claims (5)

Reheat medium pressure shutoff valve and reheat medium pressure flow control valve are connected in series between steam turbine and low pressure heat exchanger, and low pressure shutoff valve and low pressure flow control valve are connected in series between steam turbine and low pressure heat exchanger. In the operating method of the cogeneration device,
A power transaction bidding (non-constrained bidding) step of not inputting a reason for restriction when bidding a power generation system in a power trading system;
Performing automatic power generation control for controlling the power generation device with respect to the power system output request signal and frequency; And
A method of operating a cogeneration system based on non-constrained bidding for a power trading system, comprising: a step of changing a power output in real time. The method of claim 1,
The automatic power generation control step includes the automatic control of the power transaction system based on non-constrained bidding, which includes changing the power output of the power generation unit from a distributed control system (DCS) to a remote terminal unit (RTU). Power generation control tracking cogeneration operation method. The method of claim 1,
The opening degree of the reheating pressure cutoff valve is maintained at 100% and the opening degree of the reheating pressure flow control valve is fixed at 20-30% in the step of changing the electric power during the execution of the electric output. The method of operating a cogeneration system based on non-constrained bidding of a power transaction system, characterized in that the amount of steam withdrawal decreases as the reheating steam pressure decreases when the electric power drops. The method of claim 1,
The opening degree of the low pressure cutoff valve is maintained at 100% and the opening degree of the low pressure flow control valve is fixed at 5 to 10% in the step of changing the electric output during the execution of the electric output. A method of operating a cogeneration system based on non-constrained bidding based on a power trading system, characterized in that a withdrawal of steam is reduced by a drop in low pressure steam pressure. The method according to claim 3 or 4,
A method for operating a cogeneration system based on non-constrained bidding of a power trading system, characterized in that the supply amount of reheated medium pressure steam and low pressure steam supplied through a low pressure heat exchanger is changed according to the steam pressure fluctuation.

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