Dispatch method and apparatus for combined heat and power system
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Solution Overview
Problem
Combined heat and power (CHP) systems face a conflict between central heating supply and wind power utilization, particularly in winter when wind resources are abundant but electricity load is insufficient, leading to restricted wind power generation due to heating demand priorities.
Innovation Solution
A dispatch method and apparatus for a CHP system that establishes a combined heat and power dispatch model using Benders decomposition to minimize total generation cost, optimizing the operation of CHP units, non-CHP thermal units, wind farms, and heating boilers, allowing independent control of the electric power system and central heating system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CHP units generate large amount of electricity overnight to meet heating demand, then heating supply is ensured, but wind power generation is restricted
Solution Approach 1:
The patent segments the CHP system into two isolable subsystems: the electric power system (EPS) comprising CHP units, non-CHP thermal units, and wind farms; and the central heating system (CHS) comprising CHP units and heating boilers. This segmentation allows independent optimization of each subsystem while maintaining their coupling relationship, enabling wind power to be prioritized in the EPS without compromising heating reliability in the CHS.
Solution Approach 2:
The patent changes the operational parameters of CHP units dynamically by establishing a combined heat and power dispatch model that independently adjusts electricity generation and heat supply parameters. The model allows CHP units to operate at optimal points for wind power absorption during high-wind periods while ensuring heating demand is met through coordinated control of heating boilers, thereby resolving the fixed-parameter constraint that caused the contradiction.
2Productivity
If CHP unit generation output is determined solely by heat load demand, then heating supply is optimized, but wind power integration is limited
Solution Approach 1:
By segmenting the system into EPS and CHS with isolable control, the patent enables the EPS to adapt to wind power variations independently while the CHS maintains optimized heating supply. The segmentation allows wind power adaptability in the electricity sector without compromising heating efficiency in the thermal sector.
Solution Approach 2:
The patent transforms the static, heat-demand-driven CHP unit operation into a dynamic, multi-objective optimization process. The combined dispatch model continuously adjusts CHP unit generation output based on real-time wind power availability, electricity load conditions, and heating demand, enabling the system to adapt dynamically to varying wind resources while maintaining heating efficiency through coordinated control of heating boilers.
3Reliability
If centralized dispatch control is used for CHP system, then coordination between heating and power is improved, but operational flexibility is reduced
Solution Approach 1:
The patent applies segmentation by creating two isolable subsystems (EPS and CHS) that can be controlled independently through separate dispatch parameters. This segmented control structure maintains system coordination through the coupling relationship between subsystems while significantly improving operational flexibility, as each subsystem can be optimized and adjusted without requiring centralized re-dispatch of the entire system.
Data Source
AI summary
The present disclosure provides a dispatch method and apparatus for controlling a combined heat and power CHP system. The CHP system includes CHP units, non-CHP thermal units, wind farms and heating boilers; the CHP units, the non-CHP thermal units and the wind farms form an electric power system EPS of the CHP system; the CHP units and the heating boilers form a central heating system CHS of the CHP system; and the EPS and the CHS are isolable. The method includes: establishing a combined heat and power dispatch CHPD model, an objective function being a minimizing function of a total generation cost of the CHP units, the non-CHP thermal units, the wind farms and the heating boilers; solving the CHPD model based on Benders decomposition to obtain dispatch parameters for the EPS and the CHS; and controlling the EPS and the CHS according to the corresponding dispatch parameters respectively.