专利汇可以提供SYSTEMS INVOLVING MULTI-SPOOL GENERATORS专利检索,专利查询,专利分析的服务。并且A system comprises a turbine engine having a first spool connected to a compressor portion, a power turbine spool, a first generator connected to the power turbine spool, and a second generator connected to the first spool.,下面是SYSTEMS INVOLVING MULTI-SPOOL GENERATORS专利的具体信息内容。
What is claimed is:
The subject matter disclosed herein relates to power generation particularly gas turbine power generation.
Single spool configurations of generators use a high pressure turbine that is connected to a compressor and a synchronous speed generator. Disadvantages of single spool configurations may include a reduction of the power capacity of the gas turbine when ambient temperature increases or when the power grid frequency decreases.
Two spool gas turbine generators typically use a high pressure turbine that is connected to a compressor and a low pressure turbine that is connected to a generator. A disadvantage of using a two spool generator configuration is that there is a slower transient response when desired output of the generator changes. In large systems, a large power turbine spool may be difficult to design and fabricate.
According to one aspect of the invention, a system comprises a turbine engine having a first spool connected to a compressor portion, a power turbine spool, a first generator connected to the power turbine spool, and a second generator connected to the first spool.
According to another aspect of the invention, a system comprises a turbine engine having a first spool connected to a compressor portion, a power turbine spool operative to be driven by exhaust from the turbine engine, a first generator connected to the power turbine spool, and a variable speed generator connected to the first spool, operative to be driven by the first spool.
According to yet another aspect of the invention, a method for operating a system, the method comprises rotating a high pressure spool of a gas turbine engine with a variable speed generator, initiating combustion in a combustor of the gas turbine engine, driving the variable speed generator with the high pressure gas turbine engine and driving a low pressure spool connected to a second generator with exhaust from the gas turbine engine.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
Previous systems used a synchronous speed generator that was connected to a high pressure spool via a shaft (a single spool system), or was connected to a power turbine that rotated by the exhaust emitted from the high pressure spool (a multi-spool system). Advantages of using a single spool system include faster responses to transient conditions in the system, and the synchronous speed generator may be used to start the gas turbine engine. Disadvantages may include a reduction in output capacity when ambient temperatures increase, and when the grid frequency decreases. Advantages of using a typical multi-spool system include less reduction in output capacity when ambient temperatures increase, and better response to changes in grid frequencies. Disadvantages of typical multi-spool systems may include the use of a starting sub-system that increases the complexity and cost of the system, and the cost of designing and fabricating large power turbines. An additional disadvantage of a typical multi-spool generator configuration may be that the high pressure spool design is usually suitable for multi-spool applications. A typical single spool gas turbine design includes a three stage gas turbine. The three turbine stages are typically equally loaded such that one and a half of the stages power the turbine compressor, and the remaining one and a half stages outputs power to the generator. The exemplary embodiments of multi-spool systems described below include the use of a variable speed generator connected to a high pressure spool, and a second generator (synchronous or variable speed) connected to a power turbine that increase the effectiveness and efficiency of the systems. An advantage in using a variable speed generator in the multi-spool system is that for a three stage gas turbine, one an a half stages may be used to drive the compressor, a stage may be used to drive a first generator, and the remaining half stage may be used to drive a variable speed generator. Therefore, it is practical and cost effective for a single spool configuration and a multi-spool to share very similar turbine stage designs.
In operation, air is compressed by the compressor 104, mixed with fuel, and combusted in the combustor 106. The hot expanding gas in the combustor 106 rotates the high pressure spool. The hot expanding gas passes through the high pressure turbine 108, and rotates the power turbine 110. The rotation of the power turbine 110 turns the first generator 112 via the first shaft 114. The first generator 112 sends power to the grid 120. The rotation of the high pressure spool 108 rotates the second shaft 118, and the connected variable speed generator 116. The variable speed generator 116 may also send power to the grid 120. In a starting sequence, the variable speed generator 116 may be powered by the grid 120 or the secondary power source 122. A detailed exemplary starting sequence is described below.
The embodiments described above offer systems and methods for multi-spool systems that offer advantages of single spool and multi-spool systems using variable speed generators.
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
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