Complementary Services
CEN - NTSycs

Complementary Services have 3 categories:

‍1. Balance Services
2. Tension Control Services
3. Service Recovery Services

1) BALANCING SERVICES:

They correspond to the services that allow maintaining the balance between generation and demand of the system.

1.1. Primary Frequency Control (CPF)
1.2. Secondary Frequency Control (CSF)
1.3. Tertiary Frequency Control (CTF)
1.4. Rapid Frequency Control (CRP)
1.5. Interruptable Loads (CI)
1.6. Automatic and Manual Charging Disconnects (EDAC and DMC)

2) TENSION CONTROL SERVICES:

A set of actions aimed at maintaining operating tension within the permissible levels established in the regulations.

3) SERVICE RECOVERY SERVICES:

3.1. Autonomous Departure (PA)
3.2. Fast Insulation (AR)
3.3. Linkage Equipment (EV)

SOME DEFINITIONS:

CPF ->

A control action that allows the active power of generation facilities and/or equipment to be modified, with the objective of correcting frequency deviations.
The CPF must be activated locally and automatically, against a predefined frequency variation.
The coordinators who participate in the CPF must deliver 100% of the commitment within 10 [s], and must be able to maintain their contribution for a time of 5 [min].

CSF ->

Control action aimed at restoring the system's frequency to its nominal value. The CSF should operate in a centralized and automatic manner (AGC). In addition, this benefit must be activated within a time of 10 [s], after the instruction. The coordinators who participate in the CSF must deliver 100% of the commitment within 5 [min], and must be able to maintain their contribution for a time of 15 [min].

CTF ->

Control action aimed at restoring CSF reserves. The CTF must operate in a centralized and manual manner. In addition, this feature must be activated within a time of 5 [min], after the instruction. The coordinators who participate in the CTF must deliver 100% of what was committed within a time of 15 [min], and must be able to maintain their support for a time of 60 [min].

CRF ->

A control action that allows you to respond quickly to a predefined frequency deviation. The CRF must operate locally and automatically. The coordinators who participate in the CRF must deliver 100% of what was committed within a time of 1 [s], and they must be able to maintain their contribution for a predefined time.

US ->

Service provided by End Customers that allows frequency control through the partial or total interruption of its supply. In this benefit, the providers must disconnect the committed amounts within a time of 15 [min] after the Coordinator's instructions. The CI service will be operated remotely by the System Coordinator.

Tension Control ->

A set of actions aimed at maintaining operating tension within the admissible levels established in the regulations.

PRS ->

They correspond to services that, once a partial or total system shutdown has occurred, allow the electrical supply to be restored in the shortest possible time.

WHAT HAVE WE ALREADY WORKED ON? :

CONTROL
OF FREQUENCY,

REAGENT CONTROL AND

SERVICE RECOVERY PLAN

In particular for ERNC plants, we can modify your PPC to verify if the necessary requirements for regulatory compliance related to participation in Complementary Services can (or not) be implemented. In the past, we have helped our Customers to perform Frequency and Reagent Control in Thermal Plants and recently for Photovoltaic Plants.

With the following graphic, you can understand the problem of Frequency Control in each of its phases, which will depend on the type of development they require for the purpose of the project to be reviewed and its subsequent execution.

Source: National Energy Commission, 2017

How to implement your project?

To summarize, what can be seen in the graph is the distribution of reaction and delivery times to the system, according to the regulatory classification established by the national authority depending on the type of Balance Service in which you want to participate, since the characteristics required to start operating in less than 1 second are different from those required to start operating within 5 minutes.

Considering the above, it is necessary to analyze the characteristics of your plant in relation to the Balance Service in which you want to participate, which ultimately involves reviewing each system involved and, according to the results of that study, we proceed to modify the change in the Control system (s), or to the implementation of new features in your plant, that allow you to participate in the Complementary Services.

In our experience, what has happened is that the Customer's equipment and systems have had the necessary characteristics and the incorporation of equipment has generally been minimal. Therefore, what we have carried out are mainly modifications to the Control Systems as a whole, tasks that are executed together with the Customer, thus establishing the best adjustments according to the reality of the Customer and their operational culture.

What can we help with?

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