A method for coordinating a heat supply cluster isolated network

Abstract

The present application relates to single or multiple extraction heating main system, more particularly, it relates to a kind of heating unit group isolated network coordination method, primary frequency regulation action identification and primary frequency regulation logic action compensation are carried out in turn, heating main pressure preset value judgment and heating main pressure coordination maintenance;According to the primary frequency regulation signal obtained by the primary frequency regulation control device end, judge whether the unit action parameter meets the requirements of two rules, and then issue a pre-judgment instruction to the heating coordination equipment, so as to compensate towards the direction beneficial to two rules. The preset main pressure value of heating system, if the system acts and the main pressure meets the preset range, the system operation is maintained, if abnormal, heating unit group collaborative action is avoided, and the heating pipe network is greatly shaken.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of single or multiple extraction steam heat mother pipe system heat supply steam turbine group, more particularly, to a heat supply steam turbine group isolated network coordination method. BACKGROUND

[0002] In order to ensure the safe, high-quality and economic operation of Huazhong power grid, and to protect the legal rights and interests of power generation enterprises, according to the requirements of the State Electricity Regulatory Commission (SERC) Notice on the Approval of the Implementation of the Huazhong Regional Power Plant Auxiliary Service Management and Grid Connection Operation Management Detailed Rules, the Huazhong Regulatory Bureau has further revised and improved the Huazhong Regional Grid-connected Power Plant Auxiliary Service Management Detailed Rules (Trial) and the Huazhong Regional Grid-connected Power Plant Grid Connection Operation Management Detailed Rules (hereinafter referred to as the Two Rules). The Two Rules have a total of 11 major assessment items, including: safety management assessment, black start assessment, dispatching management assessment, non-planned shutdown assessment, daily power generation plan assessment, AGC assessment, primary frequency modulation assessment, reactive power regulation assessment, peak regulation assessment, and detection management assessment. Among them, primary frequency modulation refers to the process of adjusting the opening degree of the governor valve, i.e. changing the power of the generator, to adapt to the random changes in the load of the power grid, in order to meet the changes in the load of the power grid, according to the changes in the frequency of the power grid. According to the Two Rules, primary frequency modulation is a basic auxiliary service that must be provided by the generator set in order to ensure the safe and stable operation of the power system and ensure power quality. When a grid-connected power plant cannot provide basic auxiliary services due to its own reasons, it needs to be assessed. Therefore, improving the pass rate of the primary frequency modulation of the power plant and avoiding dispatching assessment are of practical economic significance to the power plant.

[0003] The primary frequency modulation function of the motor set refers to the function of limiting the change of the power grid frequency within a certain range by automatically increasing or decreasing the power of the unit according to the change of the power grid frequency when the power grid frequency exceeds the specified normal range. The primary frequency modulation function is an important means to maintain the stability of the power grid.

[0004] Frequency is an important indicator for evaluating power quality, reflecting the balance between generator power and load demand. Frequency fluctuations exceeding the allowed range can seriously affect the normal use and safety performance of electrical equipment, causing economic losses to users and imbalance of the power system. Therefore, it is extremely important to ensure the stability of the power system frequency and ensure high-quality power supply. Under the new situation of smart grid such as large-scale access of clean energy and ultra-high voltage interconnection, the power grid has higher requirements for the frequency modulation and peak regulation capacity of conventional thermal power units. In recent years, due to the continuous changes in the fuel market and the continuous decline in fuel calorific value, the unit output and flexible regulation capacity have declined, especially for heat supply steam turbine groups.

[0005] Generally, the high-pressure steam is connected into the low-pressure cylinder through the communication pipe to continue to work, and the primary frequency modulation performance is basically normal, but due to the heating extraction, the steam turbine is limited, the generator power is insufficient, the primary frequency modulation is limited, and the two rules are seriously examined, thereby causing great loss to the enterprise.

[0006] Another problem is that, in the case of ensuring the power generation of the unit, the heating extraction of the heating unit is inevitably affected, such as large fluctuation of the heat supply network pressure, causing public opinion, and the influence on the operation of the enterprise is difficult to make up, so the heating main pipe pressure compensation linkage of the heating unit group is also a technical problem to be studied at present.

[0007] Therefore, using the randomness of the primary frequency modulation of the multiple unit groups in the unit group can compensate the frequency modulation power in time and stabilize the heat supply network pressure, which is a technical problem to be solved at present. SUMMARY

[0008] In view of the problems in the prior art, the present application provides a heating unit group isolated network coordination method, which obtains a primary frequency modulation signal according to a primary frequency modulation control device end, judges whether the unit action parameters meet the requirements of the two rules, and then sends a pre-judgment instruction to the heating coordination equipment to compensate in the direction beneficial to the two rules.

[0009] To achieve the above object, the technical scheme provided by the present application is as follows:

[0010] A heating unit group isolated network coordination method, specifically:

[0011] (1) Primary frequency modulation action identification and primary frequency modulation logic action compensation:

[0012] According to the basic requirements of the two rules of the power grid, it is judged whether the primary frequency modulation change amount and the preset change amount are consistent within the preset time period of the unit primary frequency modulation action in the system;

[0013] a. If the primary frequency modulation change amount and the preset change amount are consistent, the primary frequency modulation amount is obtained based on the primary frequency modulation change amount and the preset change amount;

[0014] b. If the primary frequency modulation change amount and the preset change amount are inconsistent, the exhaust valve change condition and the extraction valve change condition parameter change condition of the corresponding unit are inconsistent, then the system respectively presets a gradual logic function, which is placed in the corresponding exhaust valve and extraction valve, and a new balance is obtained to meet the two rule parameter change amount;

[0015] If the primary frequency modulation change amount and the preset change amount are still inconsistent, the automatic logic function continues to act to obtain a new balance;

[0016] (2) When a unit in the heat supply group performs primary frequency modulation, the other units in the group maintain the stability of the heat supply main pipe pressure, and the preset value of the heat supply main pipe pressure is coordinated with the maintenance of the heat supply main pipe pressure:

[0017] In the system, the unit in the group performs primary frequency modulation for a preset period of time, and the heat supply main pipe pressure is judged to meet the preset heat supply main pipe pressure:

[0018] a. If the main pipe pressure meets the preset heat supply main pipe pressure, the unit in the group is not determined to be in primary frequency modulation signal logic excess unit, and no adjustment of the heat supply pressure main pipe is made;

[0019] b. If the main pipe pressure does not meet the preset heat supply main pipe pressure, the unit in the group is automatically adjusted according to the group coordination logic instruction.

[0020] As a further preferred technical solution, in the system, the unit in the group performs primary frequency modulation for a preset period of time, and the frequency modulation parameter requirement is specifically: 3s unit load must respond, 15s reach 60% of the response load, 30s reach more than 90% of the response load.

[0021] As a further preferred technical solution, if the primary frequency modulation variation of multiple units in the system is inconsistent with the preset variation, the unit is judged individually.

[0022] As a further preferred technical solution, the primary frequency modulation variation and the preset variation are inconsistent, specifically: the primary frequency modulation load variation increase variable or decrease variable cannot meet the time set point load variation, wherein the time set point load variation is specifically the load variation corresponding to the primary frequency modulation dead zone 50+0.033Hz.

[0023] As a further preferred technical solution, if the primary frequency modulation load variation increase variable cannot meet the time set point load, the steam turbine exhaust valve is opened and the steam turbine extraction valve is closed, and the steam turbine efficiency is increased.

[0024] As a further preferred technical solution, if the primary frequency modulation load variation decrease variable cannot meet the time set point load, the steam turbine exhaust valve is closed and the steam turbine extraction valve is opened, and the steam turbine efficiency is reduced.

[0025] As a further preferred technical solution, the primary frequency modulation variation and the preset variation are inconsistent, specifically:

[0026] When the primary frequency modulation variation exceeds the preset variation, the extraction valve is closed and the exhaust valve is opened;

[0027] When the primary frequency modulation variation is lower than the preset variation, the extraction valve is opened and the exhaust valve is closed.

[0028] If the one-time frequency variation quantity is consistent with the preset variation quantity, the exhaust valve and the extraction valve stop acting.

[0029] As a further preferred technical solution, the mother pipe pressure not meeting the preset heating mother pipe pressure is specifically:

[0030] The mother pipe pressure is higher than the preset heating mother pipe pressure.

[0031] The mother pipe pressure is lower than the preset heating mother pipe pressure.

[0032] As a further preferred technical solution, the mother pipe pressure higher than the preset heating mother pipe pressure is specifically:

[0033] If the heating mother pipe group extraction mother pipe pressure is high in the one-time frequency action of the heating mother pipe pressure of the single unit group, the system group without one-time frequency warning group coordination action, the preset value proportion is small corresponding to the steam turbine extraction valve, and the corresponding steam turbine exhaust valve is opened, so that the heating mother pipe pressure is adjusted to disappear.

[0034] If the heating mother pipe group extraction mother pipe pressure is high in the one-time frequency action of the heating mother pipe pressure of the single unit group, the system group without one-time frequency warning group coordination action, the preset value proportion is small corresponding to the steam turbine extraction valve, and the corresponding steam turbine exhaust valve is opened, so that the heating mother pipe pressure is adjusted to disappear.

[0035] The mother pipe pressure lower than the preset heating mother pipe pressure is specifically:

[0036] If the heating mother pipe group extraction mother pipe pressure is low in the one-time frequency action of the heating mother pipe pressure of the single unit group, the system group without one-time frequency warning group coordination action, the preset value proportion is small corresponding to the steam turbine extraction valve, and the corresponding steam turbine exhaust valve is opened, so that the heating mother pipe pressure is adjusted to disappear.

[0037] If the heating mother pipe group extraction mother pipe pressure is low in the one-time frequency action of the heating mother pipe pressure of the single unit group, the system group without one-time frequency warning group coordination action, the preset value proportion is small corresponding to the steam turbine extraction valve, and the corresponding steam turbine exhaust valve is opened, so that the heating mother pipe pressure is adjusted to disappear.

[0038] As a further preferred technical solution, if the adjusted warning does not disappear, and the one-time frequency group of the heating group is increased, which endangers the safety of the group, the heating coordination is cut off, and the power grid safety is preferred.

[0039] Compared with the prior art, the beneficial effects of the present application are:

[0040] The heat supply unit group isolated network coordination method of the embodiment of the application sequentially performs primary frequency modulation action recognition and primary frequency modulation logic action compensation, heat supply main pipe pressure preset value judgment and heat supply main pipe pressure coordination maintenance; according to the primary frequency modulation signal obtained at the primary frequency modulation control device end, whether the unit action parameter meets the requirements of the two rules is judged, and then a pre-judgment instruction is sent to the heat supply coordination equipment, so as to compensate in the direction beneficial to the two rules. The heat supply system has a preset main pipe pressure value, if the system acts and the main pipe pressure meets the preset range, the system operation is maintained, if it is abnormal, the heat supply unit group cooperates to act, so as to avoid large vibration of the heat supply pipe network. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of a heat supply unit group system of the embodiment of the application. DETAILED DESCRIPTION

[0042] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the application, but are not used to limit the scope of the application.

[0043] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] As Figure 1As shown, the heat supply unit group is specifically: the exhaust steam of the high-pressure cylinder of a group of steam turbines is divided into at least two parts, the first part of the high-pressure cylinder enters the external heat supply steam collecting main through a steam extraction valve for heat supply, and the second part enters the low-pressure cylinder through an exhaust valve for work to drive the generator to generate electricity, and the distribution ratio of the first part of the high-pressure cylinder exhaust steam and the second part of the high-pressure cylinder exhaust steam can be adjusted according to the demand of the heat supply load and the power generation load; the heat supply unit group is provided in parallel with a plurality of groups of steam turbines and generators, and a plurality of groups of steam turbines are connected in parallel to the external heat supply steam collecting main. In the figure, PIE: steam collecting main pressure; PIE1: T1 steam extraction pressure; PIE2: T2 steam extraction pressure; PIE n: Tn steam extraction pressure.

[0047] A heat supply unit group isolated network coordination method, specifically:

[0048] (1) Primary frequency regulation action recognition and primary frequency regulation logic action compensation:

[0049] According to the basic requirements of the two rules of the power grid, within the preset time period of the primary frequency regulation action of the unit in the system, it is judged whether the primary frequency regulation change quantity is consistent with the preset change quantity; wherein the primary frequency regulation change quantity is given by the primary frequency regulation same source device, and is obtained in real time by the unit; the preset change quantity is specifically the load change quantity corresponding to the primary frequency regulation dead zone 50±0.033HZ;

[0050] a. If the primary frequency regulation change quantity is consistent with the preset change quantity, the primary frequency regulation quantity is obtained based on the primary frequency regulation change quantity and the preset change quantity; wherein the primary frequency regulation quantity is the load change quantity after the frequency change quantity exceeds the frequency regulation dead zone;

[0051] b. If the primary frequency regulation change quantity is not consistent with the preset change quantity, the exhaust valve change condition and the steam extraction valve change condition of the corresponding unit are not consistent, then the system respectively presets a gradual logic function, which is placed in the corresponding exhaust valve and steam extraction valve, to obtain a new balance to meet the parameter change quantity of the two rules;

[0052] If the primary frequency regulation change quantity is still not consistent with the preset change quantity, the automatic logic function continues to act to obtain a new balance;

[0053] (2) When the primary frequency regulation action of a unit in the heat supply unit group occurs, the other units in the group that do not have primary frequency regulation maintain the stability of the heat supply main pipe pressure to avoid large fluctuations in the heat network pressure, and the heat supply main pipe pressure preset value judgment and heat supply main pipe pressure coordination maintenance:

[0054] Within the preset time period of the primary frequency regulation action of the unit in the system, it is judged whether the heat supply main pipe of the unit group meets the preset heat supply main pipe pressure, wherein the preset heat supply main pipe pressure depends on the difference between the steam extraction of the cluster and the heat supply branch transmission:

[0055] a. If the mother tube pressure meets the preset heating mother tube pressure, the machine group is not determined by the primary frequency modulation signal logic, and the excess unit maintains the original state without heating pressure mother tube adjustment;

[0056] b. If the mother tube pressure does not meet the preset heating mother tube pressure, the machine group is not determined by the primary frequency modulation signal logic, and the excess unit automatically adjusts the heating mother tube pressure according to the machine group coordination logic instruction.

[0057] In some embodiments of the present application, the frequency modulation parameter demand quantity in the preset time period of the unit machine group in the system is specifically: the 3S unit load must respond, the 15S reaches 60% of the response load, and the 30S reaches more than 90% of the response load.

[0058] As a further preferred technical solution, if the primary frequency modulation variation of multiple unit machines in the system is inconsistent with the preset variation, the unit machine is individually judged.

[0059] As a further preferred technical solution, the primary frequency modulation variation and the preset variation are inconsistent, specifically: the primary frequency modulation load variation increase variable or decrease variable cannot meet the time set point load variation, wherein the time set point load variation is specifically the load variation corresponding to the primary frequency modulation dead zone 50+0.033HZ.

[0060] As a further preferred technical solution, if the primary frequency modulation load variation increase variable cannot meet the time set point load, the turbine exhaust valve is opened and the turbine extraction valve is closed by a set value proportion, the turbine efficiency is increased. The set value proportion is specifically: a gradual segmented function is preset in the turbine exhaust valve and extraction valve control logic, when the primary frequency modulation load judgment demand is "T", the segmented function corresponding value is added to the turbine exhaust valve and extraction valve control logic according to the primary frequency modulation demand, and when the primary frequency modulation load judgment demand is "F", the logic addition is changed to "0" value.

[0061] As a further preferred technical solution, if the primary frequency modulation load variation decrease variable cannot meet the time set point load, the turbine exhaust valve is closed and the turbine extraction valve is opened by a set value proportion, the turbine efficiency is reduced.

[0062] As a further preferred technical solution, the primary frequency modulation variation and the preset variation are inconsistent, specifically:

[0063] When the primary frequency modulation variation exceeds the preset variation, the extraction valve is closed and the exhaust valve is opened;

[0064] When the primary frequency modulation variation is lower than the preset variation, the extraction valve is opened and the exhaust valve is closed;

[0065] If the one-time frequency variation is consistent with the preset variation, the exhaust valve and the extraction valve stop acting.

[0066] As a further preferred technical solution, the mother pipe pressure not meeting the preset heating mother pipe pressure is specifically:

[0067] The mother pipe pressure is higher than the preset heating mother pipe pressure.

[0068] The mother pipe pressure is lower than the preset heating mother pipe pressure.

[0069] As a further preferred technical solution, the mother pipe pressure higher than the preset heating mother pipe pressure is specifically:

[0070] If the heating mother pipe group extraction mother pipe pressure is high in the one-time frequency action of the heating mother pipe pressure of a single unit, the system group without one-time frequency warning unit coordination action, the preset value proportion is small, the corresponding steam turbine extraction valve is opened, the corresponding steam turbine exhaust valve is opened, and the heating mother pipe pressure is adjusted to disappear.

[0071] If the heating mother pipe group extraction mother pipe pressure is high in the one-time frequency action of the heating mother pipe pressure of multiple units, the system group without one-time frequency warning unit coordination action, the preset value proportion is small, the corresponding steam turbine extraction valve is opened, the corresponding steam turbine exhaust valve is opened, and the heating mother pipe pressure is adjusted to disappear.

[0072] The mother pipe pressure lower than the preset heating mother pipe pressure is specifically:

[0073] If the heating mother pipe group extraction mother pipe pressure is low in the one-time frequency action of the heating mother pipe pressure of a single unit, the system group without one-time frequency warning unit coordination action, the preset value proportion is small, the corresponding steam turbine extraction valve is opened, the corresponding steam turbine exhaust valve is opened, and the heating mother pipe pressure is adjusted to disappear.

[0074] If the heating mother pipe group extraction mother pipe pressure is low in the one-time frequency action of the heating mother pipe pressure of multiple units, the system group without one-time frequency warning unit coordination action, the preset value proportion is small, the corresponding steam turbine extraction valve is opened, the corresponding steam turbine exhaust valve is opened, and the heating mother pipe pressure is adjusted to disappear.

[0075] As a further preferred technical solution, if the adjusted warning does not disappear and causes the one-time frequency unit range of the heating group to increase, endangering the safety of the group, the heating coordination is removed, and the power grid safety is prioritized.

[0076] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and replacements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A method for coordinating isolated grids of heating units, characterized in that, Specifically: (1) Primary frequency modulation action identification and primary frequency modulation logic action compensation: Within a preset time period for the primary frequency regulation action of the unit in the system, determine whether the change in primary frequency regulation is consistent with the preset change. a. If the primary frequency modulation change is consistent with the preset change, the primary frequency modulation amount is obtained based on the primary frequency modulation change and the preset change; b. If the frequency regulation change is inconsistent with the preset change, and the change of the exhaust valve and the change of the extraction valve parameters of the corresponding unit are inconsistent, then the system presets an incremental logic function for each exhaust valve and extraction valve to obtain a new balance. If the frequency change is still inconsistent with the preset change, the automatic logic function will continue to operate to obtain a new balance. The frequency modulation change amount is inconsistent with the preset change amount. Specifically, the increase or decrease of the variable in the frequency modulation load change cannot meet the load change amount at the time set point. The load change amount at the time set point is specifically the load change amount corresponding to the frequency modulation dead zone 50 + 0.033 Hz. If the change in the frequency regulation load cannot meet the load at the time set point, the deviation ratio is set ahead of time to open the turbine exhaust valve and close the turbine extraction valve to increase the turbine efficiency. If the change in frequency regulation load cannot meet the load at the time set point, the advance setting deviation ratio will be used to close the turbine exhaust valve and open the turbine extraction valve, thus reducing the turbine efficiency. The specific setting of the bias ratio is as follows: a progressive piecewise function is preset in the control logic of the turbine exhaust valve and extraction valve respectively. When the primary frequency regulation load judgment demand is "T", the corresponding value of the piecewise function is superimposed on the control logic of the turbine exhaust valve and extraction valve respectively according to the primary frequency regulation demand. When the primary frequency regulation load judgment demand is "F", the logic superposition is changed to "0" value. (2) When a unit in the heating unit group performs a primary frequency regulation, the other units in the group that have not performed a primary frequency regulation maintain the stability of the heating main pipe pressure. The preset value of the heating main pipe pressure is determined and coordinated with the heating main pipe pressure to maintain stability. Within the preset time period of the unit's primary frequency regulation action in the system, determine whether the heating main pipe of the unit group meets the preset heating main pipe pressure: a. If the main pipe pressure meets the preset heating main pipe pressure, the unit group does not determine that the primary frequency regulation signal logic exceeds the limit and the unit will remain unchanged without adjusting the heating pressure main pipe. b. If the main pipe pressure does not meet the preset heating main pipe pressure, the unit will automatically adjust the heating main pipe pressure according to the unit group coordination logic instruction, based on the unit group coordination logic instruction.

2. The method for coordinating isolated grids of a heating unit group according to claim 1, characterized in that, Within the preset time period of a single frequency regulation action of a unit in the system, the specific frequency regulation parameter requirements are as follows: the unit load must respond within 3 seconds, reach 60% of the response load within 15 seconds, and reach more than 90% of the response load within 30 seconds.

3. The method for coordinating isolated heating unit networks according to claim 1, characterized in that, If the frequency regulation change of multiple units in the system is inconsistent with the preset change, then the unit will be judged separately.

4. The method for coordinating isolated heating unit networks according to claim 1, characterized in that, The inconsistency between the primary frequency modulation variation and the preset variation is specifically due to: When the frequency change exceeds the preset change, close the extraction valve slightly and open the exhaust valve wider. When the frequency change is lower than the preset change, open the extraction valve and close the exhaust valve. If the frequency change is consistent with the preset change, the exhaust valve and extraction valve will stop operating.

5. The method for coordinating isolated grids of a heating unit group according to claim 1, characterized in that, The specific reason why the main pipe pressure does not meet the preset heating main pipe pressure is: The main pipe pressure is higher than the preset heating main pipe pressure; The main pipe pressure is lower than the preset heating main pipe pressure.

6. The method for coordinating isolated grids of a heating unit group according to claim 1, characterized in that, Specifically, the pressure in the main pipe is higher than the preset heating main pipe pressure as follows: If the heating main pipe pressure of the heating main pipe group is high during the primary frequency regulation action of a single unit, then the units without a primary frequency regulation warning in the system group will coordinate to close the corresponding turbine extraction valve and open the corresponding turbine exhaust valve proportionally to adjust the heating main pipe pressure until the warning disappears. If the heating main pipe pressure of the heating main pipe group is high during the primary frequency regulation action of multiple unit units, then the unit group without primary frequency regulation warning will coordinate to close the corresponding turbine extraction valve and open the corresponding turbine exhaust valve to adjust the heating main pipe pressure until the warning disappears. Specifically, the reason why the main pipe pressure is lower than the preset heating main pipe pressure is: If the heating main pipe pressure of a single unit is low during the primary frequency regulation operation of the heating main pipe, then the units without a primary frequency regulation warning will coordinate to open the corresponding turbine extraction valve and close the corresponding turbine exhaust valve proportionally to adjust the heating main pipe pressure until the warning disappears. If the heating main pipe pressure of the heating main pipe group is low during the primary frequency regulation operation of multiple unit units, then the units without the primary frequency regulation warning will coordinate to open the corresponding turbine extraction valve and close the corresponding turbine exhaust valve proportionally to adjust the heating main pipe pressure until the warning disappears.

7. The method for coordinating isolated grids of a heating unit group according to claim 6, characterized in that, If the warning does not disappear after adjustment, and this results in an increase in the range of primary frequency regulation units in the heating unit group, endangering the safety of the unit group, then the heating coordination should be cut off, prioritizing the safety of the power grid.

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