GB/T 45905.7-2025 in English

Background and significance of standard formulation

GB/T 45905.7-2025, as an important part of the series of standards for electricity spot market operations, is a key technical specification formulated in the context of deepening power system reform and building a new power system. This standard systematically stipulates for the first time the classified configuration, mutual assistance mechanism and recovery requirements of reserve capacity in the electricity spot market environment, filling the gap in my country's reserve capacity management standards under the market-oriented operation environment.

Analysis of the reserve capacity classification system

The standard scientifically divides reserve capacity into three categories: load reserve, accident reserve and operation reserve. Each type of reserve has clear capacity configuration requirements and resource source regulations.

In-depth analysis of key technical requirements

4.1 Safety and stability constraints

The reserve capacity configuration must meet the triple safety constraints of GB38755 "Guidelines for Safety and Stability of Power Systems", GB/T38969 "Technical Guidelines for Power Systems" and GB/T31464 "Grid Operation Guidelines". In actual configuration, the following should be considered:

• Assessment of the reliability of primary energy supply
• Dynamic monitoring of unit power generation capacity
• Accurate prediction of load regulation capacity
• Equipment overload prevention mechanism
• Sectional flow stability limit control

4.2 Time characteristic requirements

The standard clearly stipulates the time dimension requirements for backup capacity: three key parameters: call time, duration and recovery time. Taking accident backup as an example, the call must be completed within 10-30 minutes, the duration must meet the fault handling requirements, and the capacity must be restored within the specified time after the call.

Hierarchical partition configuration mechanism

7.2 Operational backup partition configuration

The standard innovatively proposes the hierarchical configuration concept of the first-level control area and the second-level control area:

The determination of the sharing coefficient needs to take into account multiple dimensions such as the maximum load proportion, the installed power capacity proportion, the maximum active power shortage proportion caused by the tripping of a single device, etc., to ensure the scientificity and rationality of the sharing.

Reserve capacity mutual assistance mechanism

8.1 Principle of market-based mutual assistance

When the reserve capacity of a control area is insufficient, mutual assistance can be achieved in two ways:

1. Market-based transaction: Purchase surplus reserve capacity from other control areas through the power market platform
2. Emergency support: Apply for emergency support from the superior dispatching agency

The key requirement is to ensure that the sum of the reserved reserve capacity and mutual assistance reserve capacity of the control area meets the overall demand, which reflects the principle of self-protection as the main and external mutual assistance as the supplement.

8.2 Mutual Aid Implementation Methods

Mutual aid of spare capacity is mainly achieved through two technical means:

• Adjusting the power of inter-provincial interconnection lines: Transferring spare capacity by adjusting the transmission power of existing interconnection lines
• Reserving spare capacity across provinces: The spare capacity reserved specifically for mutual aid needs to ensure that the capacity of relevant transmission channels is sufficient

Spare capacity restoration strategy

9.1 Restoration priority

The standard specifies a clear restoration priority order:

1. Prioritize the use of available resources in the control area
2. Start mutual aid of spare capacity when resources in the control area are insufficient
3. In extreme cases, call the load of the accident power restriction priority table

9.2 Emergency handling

When a serious fault or emergency occurs, the spare capacity on the power generation side After resources such as new energy storage and adjustable loads are exhausted, if the operating reserve cannot be restored within 30 minutes, it is necessary to call on the load-side reserve resources in accordance with the government-approved emergency power restriction priority table.

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Implementation recommendations and precautions

Technical preparation requirements

The following technical preparations need to be completed before implementing this standard:

• Establish a complete backup capacity monitoring system to monitor the available status of various types of backup capacity in real time
• Develop a backup capacity mutual aid trading platform to support market-based mutual aid operations
• Improve the emergency power restriction priority table management system to ensure rapid call-up in emergency situations
• Establish a backup capacity evaluation system to regularly evaluate the rationality and effectiveness of the configuration

Operation management recommendations

< p>Recommendations for daily operation management:
1. Reserve sufficient reserve capacity in the day-ahead planning phase, and take into account special factors such as weather and equipment status
2. Monitor the availability of reserve capacity in real-time operation during the day, and promptly identify and handle anomalies
3. Establish a reserve capacity call drill mechanism to improve emergency response capabilities
4. Regularly optimize reserve capacity configuration to adapt to changes in the grid structure and adjustments to the power supply structure

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Impact Analysis of Standard Implementation

The implementation of this standard will have a profound impact on the operation of the electricity spot market:

Aspects of impact	Situation before implementation	Changes after implementation	Expected results
Spare configuration	Inconsistent standards across regions	National unified standards	Improve scientific configuration
Market operation	Lack of mutual assistance mechanism	Market-based mutual assistance mechanism	Improve Resource allocation efficiency
Safety level	Reliance on experience-based configuration	Standardized configuration requirements	Enhanced system security and stability
Emergency response	Inconsistent response processes	Standardized recovery processes	Improved emergency response efficiency

Through the implementation of this standard, a unified national reserve capacity management specification will be established, providing important technical support for the high-quality construction and safe and stable operation of the electricity spot market.