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Operation control method for alternating-current and direct-current steam turbine generator unit in isolated network state

A technology of turbogenerators and DC generators, which is applied in the field of electric power, can solve the problems of small load magnitude, small frequency changes, and changes, so as to meet the needs of improving high power quality, reducing the requirements of dynamic characteristics, and improving the use of power. The effect of longevity

Pending Publication Date: 2021-11-23
中国船舶重工集团公司第七0三研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. There is only one unit in the network to supply power, that is, a single unit with load;
[0017] The advantage of this mode is that all units absorb the load change on the isolated network together, and the magnitude of the load that a single unit bears changes becomes small, and the frequency change is small. The disadvantage is that the network frequency changes with the load change, the control is not accurate, and manual adjustment is required.

Method used

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  • Operation control method for alternating-current and direct-current steam turbine generator unit in isolated network state
  • Operation control method for alternating-current and direct-current steam turbine generator unit in isolated network state
  • Operation control method for alternating-current and direct-current steam turbine generator unit in isolated network state

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specific Embodiment approach 1

[0043] The method for controlling the operation of an AC and DC turbogenerator set in an isolated grid state includes the following steps:

[0044] Step 1. Determine the composition of the isolated grid system, including one DC turbo-generator set and at least one AC turbo-generator set;

[0045] Step 2. Start the DC turbogenerator set, set the target speed, unit rise rate, warm-up time, warm-up point, and speed critical point parameters, and the unit control method adopts frequency control;

[0046] Step 3: Wait for the speed of the DC turbo-generator set to rise to the rated speed, start the excitation system, and establish the voltage at the front inlet of the inverter;

[0047] Step 4. After adjusting the inverter outlet voltage and frequency to the rated value of the isolated grid, close the outlet circuit breaker switch of the DC turbo-generator unit, and the unit control mode maintains the frequency control unchanged;

[0048] So far, the DC steam turbine generator set...

specific Embodiment approach 2

[0061] Taking the isolated network system composed of two units as an example, the two units are mutually standby, and the capacity and structure of the units are the same. The control ability to deal with large load changes is weak, and it is easy to cause failure or damage of downstream electrical equipment.

[0062] The structure of the two-genset isolated grid operation system is as follows: image 3 As shown, among them, T2 is 2# steam turbine, G2 is 2# alternator; T3 is 3# steam turbine, G3 is 3# alternator;

[0063] The isolated grid system composed of two AC generators G2 and G3 can share the load on the grid evenly, and can also be set according to different unequal rates to freely bear the load on the grid; when there is a large load on or off the grid, 2#, 3 #The unit will automatically increase and decrease the speed to ensure that the total output power of the unit = grid power. However, due to the change of unit speed, the frequency of the grid will change. The...

specific Embodiment approach 3

[0066] combine Figure 4 Describe this embodiment. In this embodiment, the operation control system of the AC and DC turbo-generators in the isolated grid state is composed of one DC turbo-generator and at least one AC turbo-generator, wherein:

[0067] The DC turbogenerator set includes a steam turbine, a DC generator, an inverter device and a generator circuit breaker switch. Establish a connection to the grid.

[0068] The AC turbogenerator set includes a steam turbine, an alternator and a generator breaker switch. The output end of the steam turbine is installed in cooperation with the alternator, and the alternator is connected to the grid through the generator breaker switch.

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Abstract

The invention discloses an operation control methodfor an alternating-current and direct-current steam turbine generator unit in an isolated network state, and belongs to the technical field of electric power. The method comprises the following steps: 1, determining the composition of an isolated network system; 2, starting a direct-current steam turbine generator unit; 3, after the rotating speed of the direct-current steam turbine generator unit is increased to the rated rotating speed, enabling an excitation system to start excitation work; 4, adjusting the outlet voltage and frequency of the inverter to the rated value of the isolated network, and then switching on an outlet circuit breaker switch of the direct-current steam turbine generator unit; 5, enabling other alternating current steam turbine generator units in the power grid to start to be connected into the isolated network; 6, starting an alternating current steam turbine generator unit; and 7, after the rotating speed of the alternating current steam turbine generator unit is increased to the rated rotating speed, enabling the excitation system to perform excitation, and adjusting the excitation system, so that the outlet voltage, frequency and phase of the alternating current generator are consistent with those of the power grid, after the grid-connected condition is met, an outlet circuit breaker switch of the alternating current steam turbine generator unit is switched on, and the unit control mode is converted into an unequal rate control mode. The service life of the unit is prolonged, and the overhaul period is shortened.

Description

technical field [0001] The invention relates to an operation control method of a steam turbine generator set in an isolated grid state, and belongs to the technical field of electric power. Background technique [0002] The isolated grid is the abbreviation of the isolated grid. It generally refers to a small-capacity grid operating away from the large grid. The isolated grid can be divided into the following two situations: [0003] 1. There are several units running in parallel in the network; [0004] 2. There is only one unit in the network to supply power, that is, a single unit with load; [0005] The most prominent feature of isolated grid operation is the transformation from load control to frequency control, which requires the speed control system to have static characteristics that meet the requirements, good stability and dynamic response characteristics, so as to ensure that the grid frequency is automatically maintained under the condition of user load changes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/388H02J3/241
Inventor 王洪亮梁允志王永刚宋泽石昊昆范伟远安仲玉
Owner 中国船舶重工集团公司第七0三研究所